阅读说明：本技术 用于在无线通信系统中执行通信的方法和装置 (Method and apparatus for performing communication in wireless communication system ) 是由 A.阿吉瓦尔 张宰赫 于 2020-03-12 设计创作，主要内容包括：一种由用户装备(UE)执行的在切换过程中执行通信的方法包括：经由RRC重新配置消息接收上行链路(UL)授权配置信息,在UL授权信息中包括的多个SSB之中选择SSB,基于UL授权信息确定对应于所选择的SSB的UL授权和对应于UL授权的HARQ进程,以及使用HARQ进程在对应于所选择的SSB的确定的UL授权中发送重新配置完成消息。(A method performed by a User Equipment (UE) of performing communication during handover, comprising: the method includes receiving Uplink (UL) grant configuration information via an RRC reconfiguration message, selecting an SSB among a plurality of SSBs included in the UL grant information, determining an UL grant corresponding to the selected SSB and a HARQ process corresponding to the UL grant based on the UL grant information, and transmitting a reconfiguration complete message in the determined UL grant corresponding to the selected SSB using the HARQ process.)

1.A method of performing communication in a wireless communication system by a user equipment, UE, the method comprising:

receiving uplink, UL, grant configuration information via a radio resource control, RRC, reconfiguration message;

selecting an SSB among a plurality of synchronization signal blocks SSBs included in the UL grant information;

determining a UL grant corresponding to the selected SSB and a hybrid automatic repeat request, HARQ, process corresponding to the UL grant based on the UL grant information; and

the reconfiguration complete message is transmitted in the determined UL grant corresponding to the selected SSB using the HARQ process.

2. A method of performing communication in a wireless communication system by a user equipment, UE, the method comprising:

receiving uplink, UL, grant configuration information via a radio resource control, RRC, reconfiguration message;

selecting an SSB among a plurality of synchronization signal blocks SSBs included in the UL grant information;

determining a UL grant corresponding to the selected SSB and a hybrid automatic repeat request, HARQ, process corresponding to the UL grant based on the UL grant information; and

the reconfiguration complete message is transmitted in the determined UL grant corresponding to the selected SSB using the HARQ process.

3. The method of claim 1, wherein determining an UL grant and a HARQ process comprises:

identifying a period for configuring the UL grant and a number of SSBs associated with the UL grant based on the UL grant information; and

determining a UL grant based on a current symbol using the identified periodicity and the identified number, and determining a HARQ process based on the current symbol using the identified periodicity.

4. The method of claim 1, wherein:

selecting the SSB comprises:

obtaining a list indicating SSBs for a plurality of UL grant configurations from the UL grant configuration information; and

selecting an SSB for each of the plurality of UL grant configurations, an

The UL grant corresponding to the selected SSB and the HARQ process corresponding to the UL grant are determined based on each of the plurality of UL grant configurations.

5. The method of claim 4, wherein determining the HARQ process comprises:

identifying an offset value for each of the plurality of UL grant configurations; and

determining a HARQ process corresponding to the UL grant based on the identified offset value.

6. A method of performing communication in a wireless communication system by a base station, the method comprising:

transmitting uplink UL grant configuration information via an RRC reconfiguration message; and

receiving a reconfiguration complete message in an UL grant corresponding to a selected SSB at the UE from the user equipment UE using the HARQ process,

wherein:

the SSB is selected among a plurality of SSBs included in the UL grant information, an

The UL grant corresponding to the selected SSB and the HARQ process corresponding to the UL grant are determined based on the UL grant information.

7. A user equipment, UE, that performs communications in a wireless communication system, the UE comprising:

a transceiver; and

a processor coupled with the transceiver and configured to:

controls the transceiver to receive uplink UL grant configuration information via the RRC reconfiguration message,

selects an SSB among a plurality of SSBs included in the UL grant information,

determining a UL grant corresponding to the selected SSB and a HARQ process corresponding to the UL grant based on the UL grant information, an

The control transceiver transmits a reconfiguration complete message in the determined UL grant corresponding to the selected SSB using the HARQ process.

8. The UE of claim 7, wherein the processor is further configured to:

identifying a period for configuring the UL grant and a number of SSBs associated with the UL grant based on the UL grant information, an

Determining a UL grant and a HARQ process based on the current symbol using the identified period and the identified number.

9. The UE of claim 7, wherein the processor is further configured to:

identifying a period for configuring the UL grant and a number of SSBs associated with the UL grant based on the UL grant information, an

Determining a UL grant based on a current symbol using the identified periodicity and the identified number, and determining a HARQ process based on the current symbol using the identified periodicity.

10. The UE of claim 7, wherein the processor is further configured to:

obtaining a list indicating SSBs for a plurality of UL grant configurations from the UL grant configuration information,

selecting an SSB for each of the plurality of UL grant configurations, an

Determining a UL grant corresponding to the selected SSB and a HARQ process corresponding to the UL grant based on each of the plurality of UL grant configurations.

11. The UE of claim 7, wherein the processor is further configured to:

obtaining a list indicating SSBs for a plurality of UL grant configurations from the UL grant configuration information,

selecting an SSB for each of the plurality of UL grant configurations, an

Determining a UL grant corresponding to the selected SSB and a HARQ process corresponding to the UL grant based on each of the plurality of UL grant configurations.

12. A base station that performs communication in a wireless communication system, the base station comprising:

a transceiver; and

a processor coupled with the transceiver and configured to:

controlling the transceiver to transmit uplink, UL, grant configuration information via an RRC reconfiguration message; and

the control transceiver receives a reconfiguration complete message in an UL grant corresponding to the selected SSB at the UE from the user equipment UE using the HARQ process,

wherein:

the SSB is selected among a plurality of SSBs included in the UL grant information, an

The UL grant corresponding to the selected SSB and the HARQ process corresponding to the UL grant are determined based on the UL grant information.

13. The base station of claim 12, wherein:

configuring a period of a UL grant and a number of SSBs associated with the UL grant are identified based on the UL grant information, an

The UL grant and HARQ process are determined based on the current symbol using the identified period and the identified number.

14. The base station of claim 12, wherein:

the period for configuring the UL grant and the number of SSBs associated with the UL grant are identified based on the UL grant information,

the UL grant is determined based on the current symbol using the identified period and the identified number, an

A HARQ process is determined based on the current symbol using the identified periodicity.

15. The base station of claim 12, wherein:

the UL grant configuration information includes a list indicating SSBs for a plurality of UL grant configurations,

selecting an SSB for each of the plurality of UL grant configurations, an

The UL grant corresponding to the selected SSB and the HARQ process corresponding to the UL grant are determined based on each of the plurality of UL grant configurations.

Technical Field

The present disclosure relates to wireless communication systems, and more particularly, to methods and apparatus for determining Synchronization Signal Blocks (SSBs) and hybrid automatic repeat request (HARQ) processes corresponding to Uplink (UL) grants configured for a random access channel (RACH-less) handover.

Background

In order to meet the increasing demand for wireless data traffic since the deployment of fourth generation (4G) communication systems, efforts have been made to develop improved fifth generation (5G) or quasi-5G communication systems. The 5G or quasi-5G communication system is also referred to as a "super 4G network" or a "Long Term Evolution (LTE) system". 5G communication systems are known to be implemented in the higher frequency (mmWave) band (e.g., 60GHz band) in order to achieve higher data rates. In order to reduce propagation loss of radio waves and increase transmission distance, beamforming, massive Multiple Input Multiple Output (MIMO), full-dimensional MIMO (FD-MIMO), array antenna, analog beamforming, and massive antenna techniques are discussed for a 5G communication system. Further, in the 5G communication system, development of system network improvement is being performed based on advanced small cells, cloud Radio Access Network (RAN), ultra dense network, device-to-device (D2D) communication, wireless backhaul, mobile network, cooperative communication, coordinated multipoint (CoMP), receiving side interference cancellation, and the like. In 5G systems, hybrid Frequency Shift Keying (FSK) and Feher Quadrature Amplitude Modulation (FQAM) and Sliding Window Superposition Coding (SWSC) have been developed as Advanced Coding Modulation (ACM), and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and Sparse Code Multiple Access (SCMA) as advanced access techniques.

The internet is now evolving as an internet of things (IoT) as a human-centric connected network of human-generated and-consumed information, in which distributed entities such as things exchange and process information without human intervention. Internet of everything (IoE) has emerged as a combination of IoT technology and big data processing technology through connection with a cloud server. As IoT implementations have required technical elements such as "sensing technology", "wired/wireless communication and network infrastructure", "service interface technology", and "security technology", sensor networks, machine-to-machine (M2M) communication, Machine Type Communication (MTC), etc. have been recently studied. Such IoT environments can provide intelligent internet technology services that create new value for human life by collecting and analyzing data generated between connected things. Through the convergence and combination between existing Information Technology (IT) and various industrial applications, IoT may be applied in various fields, including smart homes, smart buildings, smart cities, smart cars or networked cars, smart grids, healthcare, smart homes, and advanced medical services.

In line with this, various attempts have been made to apply the 5G communication system to the IoT network. For example, techniques such as sensor network, MTC, and M2M communication may be implemented through beamforming, MIMO, and array antennas. The application of cloud RAN as the big data processing technology described above can also be considered as an example of the fusion between 5G technology and IoT technology.

As described above, various services can be provided according to the development of wireless communication systems, and thus a method for easily providing such services is required.

Disclosure of Invention

"technical problem

While the UE performs handover, a delay occurs due to the random access being performed.

"technical solution

A method performed by a User Equipment (UE) of performing communication during handover, comprising: the method includes receiving Uplink (UL) grant configuration information via an RRC reconfiguration message, selecting an SSB among a plurality of SSBs included in the UL grant information, determining an UL grant corresponding to the selected SSB and a HARQ process corresponding to the UL grant based on the UL grant information, and transmitting a reconfiguration complete message in the determined UL grant corresponding to the selected SSB using the HARQ process.

Drawings

Fig. 1 is an example illustration of a mapping between HARQ process IDs and configured UL grants based on the above method; and

fig. 2 is a diagram illustrating a method of mapping SSB/CSI-RS, HARQ process ID and configured UL grant according to an embodiment of the present disclosure; and

fig. 3 is a flow diagram illustrating a method of mapping SSB/CSI-RS, HARQ process ID and configured UL grants according to an embodiment of the disclosure; and

fig. 4 is a diagram illustrating a method of mapping SSB/CSI-RS, HARQ process ID and configured UL grant according to an embodiment of the present disclosure; and

fig. 5 is a flow diagram illustrating a method of mapping SSB/CSI-RS, HARQ process ID and configured UL grants according to an embodiment of the disclosure; and

fig. 6 is a diagram illustrating a method of mapping SSB/CSI-RS, HARQ process ID and configured UL grant according to an embodiment of the present disclosure; and

fig. 7 is a flow diagram illustrating a method of mapping SSB/CSI-RS, HARQ process ID and configured UL grants according to an embodiment of the disclosure; and

fig. 8 is a diagram illustrating a method of mapping SSB/CSI-RS, HARQ process ID and configured UL grant according to an embodiment of the present disclosure; and

fig. 9 is a flowchart illustrating a method of mapping SSB/CSI-RS, HARQ process ID and configured UL grant according to an embodiment of the present disclosure; and

fig. 10 is a flow diagram illustrating a method of mapping SSB/CSI-RS, HARQ process ID and configured UL grant at a UE according to an embodiment of the present disclosure; and

fig. 11 is a flow diagram illustrating a method of mapping SSB/CSI-RS, HARQ process ID and configured UL grants according to an embodiment of the disclosure; and

fig. 12 is a diagram illustrating a UE 1200 according to an embodiment of the present disclosure; and

fig. 13 is a diagram illustrating a base station 1300 according to an embodiment of the present disclosure.

Detailed Description

In the current handover procedure, initial beam alignment between the UE and the target cell occurs via a random access procedure. To reduce handover delay, no RACH handover needs to be studied.

A method and apparatus for performing communication in a handover procedure are provided. According to an embodiment, a method performed by a UE to perform communication in a handover procedure includes: receiving Uplink (UL) grant configuration information via an RRC reconfiguration message; selecting an SSB among a plurality of SSBs included in the UL grant information; determining a UL grant corresponding to the selected SSB and a HARQ process corresponding to the UL grant based on the UL grant information; and transmitting a reconfiguration complete message in the determined UL grant corresponding to the selected SSB using the HARQ process.

Before proceeding with the following detailed description, it may be advantageous to set forth definitions of certain words and phrases used throughout this patent document: the terms "include" and "comprise," as well as derivatives thereof, mean inclusion without limitation; the term "or" is inclusive, meaning and/or; the phrases "associated with," and derivatives thereof, may mean including, included within, interconnected with, containing, contained within, connected to, or connected with, coupled to, or coupled with, communicable with, cooperative with, interleaved with, juxtaposed with, proximate to, bound to, or bound with,. having, properties of,. and the like; and the term "controller" means any device, system or part thereof that controls at least one operation, such a device may be implemented in hardware, firmware or software, or some combination of at least two of the same. It should be noted that the functionality associated with any particular controller may be centralized or distributed, whether locally or remotely.

Further, the various functions described below can be implemented or supported by one or more computer programs, each formed from computer-readable program code and embodied in a computer-readable medium. The terms "application" and "program" refer to one or more computer programs, software components, sets of instructions, procedures, functions, objects, classes, instances, related data, or a portion thereof adapted for implementation in suitable computer readable program code. The phrase "computer readable program code" includes any type of computer code, including source code, object code, and executable code. The phrase "computer readable medium" includes any type of medium capable of being accessed by a computer, such as Read Only Memory (ROM), Random Access Memory (RAM), a hard disk drive, a Compact Disc (CD), a Digital Video Disc (DVD), or any other type of memory. A "non-transitory" computer-readable medium does not include a wired, wireless, optical, or other communication link that sends transitory electrical or other signals. Non-transitory computer readable media include media capable of permanently storing data and media capable of storing data and later rewriting, such as rewritable optical disks or erasable memory devices.

Definitions for certain words and phrases are provided throughout this patent document. Those of ordinary skill in the art should understand that in many, if not most instances, such definitions apply to prior, as well as future uses of such defined words and phrases.

"modes of invention"

Fig. 1 through 13, discussed below, and the various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any suitably arranged system or device.

A method and apparatus for performing communication in a handover procedure are provided.

In order to achieve the purpose, the following technical scheme is adopted in the application: a method of performing communication by a UE, comprising: receiving Uplink (UL) grant configuration information via an RRC reconfiguration message; selecting an SSB among a plurality of SSBs included in the UL grant information; determining a UL grant corresponding to the selected SSB and a HARQ process corresponding to the UL grant based on the UL grant information; and transmitting a reconfiguration complete message in the determined UL grant corresponding to the selected SSB using the HARQ process.

In some embodiments, determining the UL grant and the HARQ process comprises: identifying a period for configuring the UL grant and a number of SSBs associated with the UL grant based on the UL grant information; and determining a UL grant and a HARQ process based on the current symbol using the identified period and the identified number.

In some embodiments, determining the UL grant and the HARQ process comprises: identifying a period for configuring the UL grant and a number of SSBs associated with the UL grant based on the UL grant information; and determining a UL grant based on the current symbol using the identified periodicity and the identified number, and determining a HARQ process based on the current symbol using the identified periodicity.

In some embodiments, selecting the SSB comprises: obtaining a list indicating SSBs for a plurality of UL grant configurations from the UL grant configuration information; and wherein selecting the SSB comprises selecting the SSB for each of the plurality of UL grant configurations, and the UL grant corresponding to the selected SSB and the HARQ process corresponding to the UL grant are determined based on each of the plurality of UL grant configurations.

In some embodiments, determining the HARQ process comprises: identifying an offset value for each of a plurality of UL grant configurations; and determining a HARQ process corresponding to the UL grant based on the identified offset.

A method of performing communication on an unlicensed frequency band by a base station, comprising: transmitting Uplink (UL) grant configuration information via an RRC reconfiguration message; and receiving, from a User Equipment (UE), a reconfiguration complete message in a UL grant corresponding to the SSB selected at the UE using the HARQ process, wherein the SSB is selected among a plurality of SSBs included in the UL grant information, and the UL grant corresponding to the selected SSB and the HARQ process corresponding to the UL grant are determined based on the UL grant information.

A User Equipment (UE) that performs communication in a wireless communication system, the UE comprising: a transceiver; and a processor coupled with the transceiver and configured to: the method includes controlling a transceiver to receive Uplink (UL) grant configuration information via an RRC reconfiguration message, selecting an SSB among a plurality of SSBs included in the UL grant information, determining an UL grant corresponding to the selected SSB and a HARQ process corresponding to the UL grant based on the UL grant information, and controlling the transceiver to transmit a reconfiguration complete message in the determined UL grant corresponding to the selected SSB using the HARQ process.

A base station that performs communication in a wireless communication system, the base station comprising: a transceiver; and a processor coupled with the transceiver and configured to: controlling the transceiver to transmit Uplink (UL) grant configuration information via an RRC reconfiguration message; and controlling the transceiver to receive a reconfiguration complete message in a UL grant corresponding to a selected SSB at a User Equipment (UE) from the UE using the HARQ process, wherein the SSB is selected among a plurality of SSBs included in the UL grant information, and the UL grant corresponding to the selected SSB and the HARQ process corresponding to the UL grant are determined based on the UL grant information.

Throughout the disclosure, the expression "at least one of a, b and c" means only a, only b, only c, both a and b, both a and c, both b and c, all or a variation thereof. Throughout the specification, a layer (or layer means) may also be referred to as an entity. Hereinafter, the operational principle of the present disclosure will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or configurations are not described in detail since they would obscure the disclosure in unnecessary detail. Terms used in the specification are defined in consideration of functions used in the present disclosure and can be changed according to the intention of a user or an operator or a general method. Therefore, the definition of terms is understood based on the entire description of the present specification.

In the drawings, some elements may be exaggerated, omitted, or roughly shown for the same reason. Further, the size of each element does not exactly correspond to the actual size of each element. In each of the drawings, the same or corresponding elements are denoted by the same reference numerals.

Advantages and features of the present disclosure, and methods of accomplishing the same, may be understood more readily by reference to the following detailed description of embodiments of the disclosure and the accompanying drawings. This disclosure may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments of the disclosure are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the disclosure to those skilled in the art. Accordingly, the scope of the disclosure is defined by the appended claims. Like reference numerals refer to like elements throughout the specification. It will be understood that blocks of the flowchart or combinations of flowcharts can be implemented by computer program instructions. Because these computer program instructions may be loaded onto a processor of a general purpose computer, special purpose computer, or another programmable data processing apparatus, the instructions that execute via the processor of the computer or another programmable data processing apparatus create means for implementing the functions specified in the flowchart block or blocks.

The computer program instructions may be stored in a computer usable or computer-readable memory that can direct a computer or another programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer usable or computer-readable memory produce an article of manufacture including instruction means that implement the function specified in the flowchart block(s). The computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operations to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide operations for implementing the functions specified in the flowchart block(s).

In addition, each block may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order. For example, two consecutive blocks may also be executed simultaneously or in reverse order, depending on the function to which they correspond.

As used herein, the term "unit" means a software element or a hardware element such as a Field Programmable Gate Array (FPGA) or an Application Specific Integrated Circuit (ASIC), and performs a specific function. However, the term "unit" is not limited to software or hardware. A "unit" may be formed in an addressable storage medium or may be formed to operate one or more processors. Thus, for example, the term "unit" may include an element (e.g., a software element, an object-oriented software element, a class element, and a task element), a process, a function, an attribute, a procedure, a subroutine, a segment of program code, a driver, firmware, microcode, circuitry, data, database, data structure, table, array, or variable.

The functions provided by the elements and "units" may be combined into a smaller number of elements and "units" or may be separated into additional elements and "units". Further, the elements and "units" may be implemented as one or more Central Processing Units (CPUs) in a rendering device or a secure multimedia card. Further, in an embodiment of the present disclosure, a "unit" may include at least one processor. In the following description of the present disclosure, well-known functions or configurations are not described in detail since they would obscure the present disclosure in unnecessary detail.

Hereinafter, for convenience of explanation, the present disclosure uses terms and names defined in the third generation partnership project long term evolution (3GPP LTE) standard. However, the present disclosure is not limited to terms and names, but may also be applied to systems that comply with other standards.

In the present disclosure, for ease of explanation, an evolved node b (enb) may be used interchangeably with a next generation node b (gnb). That is, a Base Station (BS) described by the eNB may represent the gNB. In the following description, the term "base station" refers to an entity for allocating resources to a User Equipment (UE), and may be used interchangeably with at least one of a eNode B, an eNode B, a node B, a Base Station (BS), a radio access unit, a Base Station Controller (BSC), and a node on a network. The term "terminal" may be used interchangeably with User Equipment (UE), Mobile Station (MS), cellular telephone, smart phone, computer, or multimedia system capable of performing communication functions. However, the present disclosure is not limited to the above examples. In particular, the present disclosure is applicable to a 3GPP New Radio (NR) (or fifth generation (5G)) mobile communication standard. In the following description, the term eNB may be used interchangeably with the term gNB for ease of explanation. That is, a base station interpreted as an eNB may also indicate a gNB. The term UE may also indicate mobile phones, NB-IoT devices, sensors, and other wireless communication devices.

In a fifth generation wireless communication system operating in a higher frequency (mmWave) band, a UE and a gNB communicate with each other using beamforming. Beamforming techniques are used to mitigate propagation path loss and increase propagation distance for communication at higher frequency bands. Beamforming uses high gain antennas to enhance transmission and reception performance. Beamforming can be classified into Transmit (TX) beamforming performed at a transmitting end and Receive (RX) beamforming performed at a receiving end. Generally, TX beamforming increases directivity by allowing the area reached by propagation to be densely located in a specific direction using a plurality of antennas. In this case, the aggregation of a plurality of antennas can be referred to as an antenna array, and each antenna included in the array may be referred to as an array element. The antenna array can be configured in various forms such as a linear array, a planar array, and the like. The use of TX beamforming results in an increase in the directivity of the signal, thereby increasing the propagation distance. Further, since the signal is hardly transmitted in a direction other than the directional direction, the signal interference acting on the other receiving end is significantly reduced. The receiving end can perform beamforming on the RX signal by using the RX antenna array. RX beamforming provides an effect of blocking interference signals by allowing propagation to concentrate in a specific direction to increase the strength of RX signals transmitted in the specific direction and excluding signals transmitted in directions other than the specific direction from the RX signals. By using the beamforming technique, the transmitter is able to form a plurality of transmission beam patterns in different directions. Each of these transmit beam patterns can also be referred to as a Transmit (TX) beam. Since each narrow TX beam provides coverage to a portion of a cell, wireless communication systems operating at high frequencies transmit signals in the cell using multiple narrow TX beams. The narrower the TX beam, the higher the antenna gain and, therefore, the greater the propagation distance of the signal transmitted using beamforming. The receiver is also capable of forming multiple Receive (RX) beam patterns in different directions. Each of these receive patterns can also be referred to as a Receive (RX) beam.

Fifth generation wireless communication systems support a standalone mode of operation and Dual Connectivity (DC). In DC, multiple Rx/txues may be configured to utilize resources provided by two different nodes (or NBs) connected via non-ideal backhauls. One node acts as a primary node (MN) and the other node acts as a Secondary Node (SN). The MN and the SN are connected via a network interface, and at least the MN is connected to a core network. NR also supports multi-RAT dual connectivity (MR-DC) operation, whereby a UE at RRC _ CONNECTED is configured to utilize radio resources provided by two distinct schedulers located in two different nodes CONNECTED via a non-ideal backhaul and providing E-UTRA (i.e., if the node is a ng-eNB) or NR access (i.e., if the node is a gNB). In NR, for a UE in RRC _ CONNECTED that is not configured with CA/DC, only one serving cell includes a primary cell. For a UE in RRC _ CONNECTED configured with CA/DC, the term "serving cell" is used to denote a set of cells including the special cell(s) and all secondary cells. In NR, the term Master Cell Group (MCG) refers to a set of serving cells associated with a master node, including a PCell and optionally one or more scells. In NR, the term Secondary Cell Group (SCG) refers to a set of serving cells associated with a secondary node, including a PSCell and optionally one or more scells. In NR, PCell (primary cell) refers to a serving cell in an MCG operating on a primary frequency, where a UE performs an initial connection establishment procedure or initiates a connection re-establishment procedure. In NR, an SCell is a cell that provides additional radio resources on top of a special cell for a UE configured with CA. The primary SCG cell (PSCell) refers to a serving cell in an SCG in which a UE performs random access when performing reconfiguration with a synchronous procedure. For dual connectivity operation, the term SpCell (i.e., special cell) refers to the PCell of the MCG or the PSCell of the SCG, otherwise the term special cell refers to the PCell.

In fifth generation wireless communication systems, a node b (gnb) or base station in a cell broadcasts synchronization signals, and a PBCH block (SSB) includes primary and secondary synchronization signals (PSS, SSS) and system information. The system information includes common parameters required for communication in the cell. In a fifth generation wireless communication system (also referred to as next generation radio or NR), System Information (SI) is divided into MIB and a plurality of SIBs, where:

the MIB is always transmitted on PBCH with a periodicity of 80ms and is repeated within 80ms, and it includes parameters required to acquire the SIB1 from the cell.

The SIB1 is transmitted on the DL-SCH with a period of 160ms and variable transmission repetition. The default transmission repetition period of SIB1 is 20ms, but the actual transmission repetition period depends on the network implementation. The SIB1 includes information about the availability and scheduling of other SIBs (e.g., SIB to SI message mapping, periodicity, SI window size) with an indication of whether one or more SIBs are to be provided only on demand, and in this case the configuration required by the UE to perform the SI request. SIB1 is a cell-specific SIB;

SIBs other than SIB1 are carried in a System Information (SI) message, which is sent on the DL-SCH. Only SIBs with the same periodicity can be mapped to the same SI message.

In a fifth generation wireless communication system, a Physical Downlink Control Channel (PDCCH) is used to schedule DL transmissions on the PDSCH and UL transmissions on the PUSCH, wherein Downlink Control Information (DCI) on the PDCCH includes: a downlink assignment including at least a modulation and coding format, resource allocation, and hybrid ARQ information associated with the DL-SCH; the uplink scheduling grant contains at least modulation and coding format, resource allocation, and hybrid ARQ information related to the UL-SCH. In addition to scheduling, PDCCH can be used to: activating and deactivating configured PUSCH transmissions using configured grants; activation and deactivation of PDSCH semi-persistent transmission; notifying one or more UEs of a slot format; notifying one or more UEs of which PRB(s) and OFDM symbol(s) that the UE may assume are not transmitted for the UE; transmission of TPC commands for PUCCH and PUSCH; transmitting, by one or more UEs, one or more TPC commands for SRS transmission; converting an activated bandwidth portion of the UE; and initiating a random access flow. The UE monitors a set of PDCCH candidates in configured monitoring occasions in one or more configured control resource sets (CORESET) according to the corresponding search space configuration. CORESET consists of a set of PRBs with a duration of 1 to 3 OFDM symbols. Resource Element Groups (REGs) and Control Channel Elements (CCEs) are defined within the CORESET, where each CCE includes a set of REGs. The control channel is formed by an aggregation of CCEs. Different code rates of the control channel are achieved by aggregating different numbers of CCEs. Interleaved and non-interleaved CCE to REG mapping is supported in CORESET. Polarization coding is used for the PDCCH. Each resource element group carrying the PDCCH carries its own DMRS. QPSK modulation is used for PDCCH.

In fifth generation wireless communication systems, a list of search space configurations is signaled by the GNB for the BWP of each configuration, where each search configuration is uniquely identified by an identifier. The identifier of the search space configuration to be used for a specific purpose, such as paging reception, SI reception, random access response reception, is explicitly signaled by the gNB. In NR, the search space configuration includes parameters of Monitoring-period-PDCCH-slot (Monitoring-period-PDCCH-slot), Monitoring-offset-PDCCH-slot (Monitoring-offset-PDCCH-slot), Monitoring-symbol-PDCCH-intra-slot (Monitoring-symbols-PDCCH-in-slot), and duration. The UE uses the parameters PDCCH monitoring period (monitor-period-PDCCH-slot), PDCCH monitoring offset (monitor-offset-PDCCH-slot) and PDCCH monitoring pattern (monitor-symbol-PDCCH-intra-slot) to determine PDCCH monitoring occasion(s) within the slot. PDCCH monitoring occasions exist in slots "x" to "x + duration", where the slot with number "x" in the radio frame with number "y" satisfies the following equation:

(y (number of slots in radio frame) + x-monitor-offset-PDCCH-Slot) mod (monitor-period-PDCCH-Slot) is 0;

the starting symbol of a PDCCH monitoring occasion in each slot with a PDCCH monitoring occasion is given by a monitor-symbol-PDCCH-inner-slot. The length of the PDCCH monitoring occasion (in symbols) is given in CORESET associated with the search space. The search space configuration includes an identifier of the CORESET configuration associated therewith. A list of CORESET configurations is signaled by the GNB for the BWP of each configuration, where each CORESET configuration is uniquely identified by an identifier. Note that each radio frame has a 10ms duration. The radio frame is identified by a radio frame number or a system frame number. Each radio frame comprises a number of time slots, wherein the number of time slots and the duration of the time slots in the radio frame depends on the subcarrier spacing. The number of slots in a radio frame and the duration of the slots depend on the radio frame of each supported SCS, predefined in NR. Each CORESET configuration is associated with a list of TCI (transport configuration indicator) states. One DL RS ID (SSB or CSI RS) is configured per TCI state. The TCI status list corresponding to the CORESET configuration is signaled by the gNB via RRC signaling. One of the TCI states in the TCI state list is activated by the gNB and indicated to the UE. The TCI status indicates the DL TX beam used by the GNB for transmitting PDCCH in the PDCCH monitoring occasion of the search space (the SSB/CSI RS of the DL TX beam and TCI status are QCL).

In a fifth generation wireless communication system, Bandwidth Adaptation (BA) is supported. With BA, the reception and transmission bandwidth of the UE does not need to be as large as the bandwidth of the cell and can be adjusted: the width can be commanded to change (e.g., to shrink during periods of low activity to save power); the location can be moved in the frequency domain (e.g., to increase scheduling flexibility); and the subcarrier spacing can be commanded to change (e.g., to allow different services). A subset of the total cell bandwidth of a cell is called a bandwidth part (BWP). The BA is achieved by configuring the RRC connected UE with BWP(s) and telling the UE which configured BWP is currently the active one. When the BA is configured, the UE only has to monitor the PDCCH on that active BWP, i.e. it does not have to monitor the PDCCH on the entire DL frequency of the serving cell. In the RRC connected state, the UE is configured with one or more DL and UL BWPs for each configured serving cell (i.e., PCell or SCell). For an active serving cell, there is always one active UL and DL BWP at any point in time. The BWP transition for the serving cell is used to activate the inactive BWP and deactivate the active BWP each time. The BWP transition is controlled by PDCCH indicating downlink assignment or uplink grant, by BWP-inactivytytimer, by RRC signaling or by the MAC entity itself when initiating the random access procedure. Upon addition of the SpCell or activation of the SCell, DL BWP and UL BWP, indicated by firstActiveDownlinkBWP-Id and firstActiveUplinkBWP-Id, respectively, are active without receiving PDCCH indicating downlink assignment or uplink grant. BWP for activation of the serving cell is indicated by RRC or PDCCH. For unpaired spectrum, DL BWP is paired with UL BWP, and the BWP transition is common to both UL and DL. Upon expiration of the BWP inactivity timer, the UE transitions the active DL BWP to the default DL BWP or the initial DL BWP (if the default DL BWP is not configured).

In fifth generation wireless communication systems (also referred to as new radios, or NRs), network controlled cell level mobility is supported for UEs in Radio Resource Control (RRC) CONNECTED. A typical flow of cell-level mobility as described in TS 38.300 is as follows:

1. the source gbb configures UE measurement procedures and UE reports according to the measurement configuration.

2. The source gNB decides to handover the UE based on the measurement report (MeasurementReport) and RRM information.

3. The source gNB sends a handover request message to the target gNB, passing a transparent RRC container with information, in preparation for handover at the target side. This information includes at least the target cell ID, KgNB, C-RNTI of the UE in the source gNB, RRM configuration including UE inactivity time, basic AS-configuration including antenna information and DL carrier frequency, current QoS flow to DRB mapping rules applied to the UE, SIB1 from source gNB, UE capabilities for different RATs, PDU session related information, and can include UE reported measurement information including beam related information (if available). The PDU session related information includes slice information (if supported) and QoS flow level QoS profile(s).

4. Admission control may be performed by the target gNB. Slice-aware admission control should be performed if slice information is communicated to the target gNB. If a PDU session is associated with an unsupported slice, the target gNB will reject such a PDU session.

5. The target gNB prepares a HANDOVER with L1/L2 and transmits a HANDOVER REQUEST ACKNOWLEDGE to the source gNB, which includes a transparent container to be transmitted as an RRC message to the UE to perform the HANDOVER.

6. The source gNB triggers Uu handover by transmitting to the UE a rrcreeconfiguration message containing information for accessing the target cell: at least a target cell ID, a new C-RNTI, a target gNB security algorithm identifier for the selected security algorithm. It can also include a set of dedicated RACH resources, an association between RACH resources and SSB(s), an association between RACH resources and UE-specific CSI-RS configuration(s), common RACH resources, and system information of the target cell, etc.

7. The source gNB transmits an SN STATUS TRANSFER message to the target gNB.

The UE synchronizes to the target cell after DL synchronization, and the UE performs a random access procedure for UL synchronization. The UE completes the RRC handover procedure by transmitting an rrcreeconfigurationcomplete message to the target gNB.

9. The target gNB transmits PATH SWITCH a REQUEST message to the AMF to trigger the 5GC to switch the DL data path towards the target gNB and to establish an NG-C interface instance towards the target gNB.

10.5GC converts the DL data path towards the target gNB. The UPF session/tunnel per PDU conveys one or more "end marker" packets to the source gNB on the old path and is then able to release any U-plane/TNL resources towards the source gNB.

AMF ACKNOWLEDGEs PATH SWITCH REQUEST message with PATH SWITCH REQUEST ACKNOWLEDGE message.

12. Upon receiving PATH SWITCH a REQUEST ACKNOWLEDGE message from the AMF, the target gNB transmits a UE CONTEXT RELEASE to inform the source gNB about the success of the handover. The source gbb may then release radio and C-plane related resources associated with the UE context. Any ongoing data forwarding may continue.

To reduce handover delay, no RACH handover is being investigated. Without RACH handover, the UE may not perform random access with the target cell. The handover command (i.e., rrcreconfigurable, where the CellGroupConfig IE in the rrcreconfigurable message contains the spCellConfig with the reconfigurationWithSync) may indicate whether the UE should skip random access with the target cell. For UL transmissions in the target cell, the handover command also indicates whether the Timing Advance (TA) of the source cell is applied or whether TA is equal to zero. The handover command may optionally provide a pre-allocated UL grant for sending the rrcreeconfigurationcomplete message and/or UL data. NR supports a high frequency band (between 24250MHz and 52600 MHz) (also known as FR2 band) and a lower frequency band (between 410MHz and 7125 MHz) (also known as FR1 band). At high frequencies, beamforming may be necessary. In the current handover procedure, initial beam alignment between the UE and the target cell occurs via a random access procedure. Without RACH handover, for beam alignment, the pre-allocated UL grant signaled in the handover command (i.e. rrcreconfigurable, where the CellGroupConfig IE in rrcreconfigurable message contains the spCellConfig with the reconfigurationWithSync) may be associated with one or more sync signal blocks, i.e. the SSB/channel state information reference signal(s) (i.e. the CSI RS(s) sent by the gNB). Each SSB/CSI-RS is identified by an SSB ID/CSI-RS ID, respectively. The UE can select a suitable SSB/CSI RS (where the SSB/CSI RS is suitable if the measured SS-RSRP/CSI-RSRP for the SSB/CSI-RS by the UE is above a configured threshold), and then send the MAC PDU in the UL grant corresponding to the selected SSB/CSI RS. The method determines which UL grant of the pre-allocated UL grants is associated with which SSB/CSI RS and what the HARQ process ID corresponding to each of the pre-allocated UL grants is.

In NR, the network may signal the configured UL grant by sending a rrcreeconfiguration message including a configgradentrconfig IE. The UE may determine the HARQ process ID corresponding to the configured UL grant starting at "CURRENT _ symbol" as follows:

HARQ process ID ═ floor (CURRENT _ symbol/period) modulo nrofHARQ-Processes

-wherein CURRENT _ symbol ═ (SFN × number of slot spotsperframe × number of symbol sporspot + in frame × number of symbol of symbosperspot + in slot)

Numberofslotspersframe and numberofsymbolsrslot refer to the number of consecutive slots per frame and the number of consecutive symbols per slot, respectively. The numberofslotspersframe is SCS specific and predefined for each SCS.

The period (in symbols) is the period in which UL grant is configured via ConfiguredGrantConfig. Signalling the configuratedgrantConfig in a RRCREConfiguration message

SFN is the System frame number of the UL grant allocating the configuration

The slot number is the starting slot of the UL grant for the configuration

The symbol number is the starting symbol of the UL grant for the configuration

Signaling of nrofHARQ-Processes in ConfigredGrantConfig

CURRENT _ symbol refers to the symbol index of the first transmission opportunity of the repeated bundling that occurs in case of bundled UL grant.

Fig. 1 is an example illustration of the mapping between HARQ process IDs and configured UL grants based on the above method. In this example, nrofHARQ-Processes is 2. The HARQ process IDs are sequentially assigned to the UL grant every "N" cycles, where the first cycle starts at SFN 0 and N equals nrofHARQ-Processes.

According to an embodiment of the present disclosure, there is provided a method of mapping between configured UL grant, SSB/CSI-RS and HARQ process ID in case of RACH-less reconfiguration with synchronization in a handover/reconfiguration procedure.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. These methods can also be applied to situations other than handover/reconfiguration withsync/reconfiguration procedures.

Fig. 2 is a diagram illustrating a method of mapping SSB/CSI-RS, HARQ process ID, and configured UL grant according to an embodiment of the present disclosure.

Referring to fig. 2, the network (i.e., the gNB) may signal (e.g., in a reconfiguration message or system information or connection release message) the configured grant configuration and a list of SSB/CSI RSs associated with the configured grant configuration (SSB IDs or CSI RS IDs or TCI state IDs included in the list). In the method, the SSB/CSI RS in the SSB/CSI RS list associated with the configured grant configuration are sequentially associated to the UL grant every "N" periods, where the first period starts from SFN 0 and N equals the number of SSB/CSI RS in the list. In an example, nrofHARQ-Processes is 2 and the number of SSBs/CSI-RSs associated with the configured grant is 2.

Fig. 3 is a flowchart illustrating a method of mapping SSB/CSI-RS, HARQ process ID and configured UL grant according to an embodiment of the present disclosure.

In operation S310, the UE may receive a rrcreeconfiguration message from the gNB. The spCellConfig in the RRCReconfiguration message may include reconfigurationWithSync. Information included in the reconfigurationWithSync IE (e.g., an indication to skip RACH) indicates that the UE will skip RACH towards the target cell. The rrcreeconfiguration message may include a pre-allocated UL grant configuration (a parameter indicating that UL grant occurs periodically). The configuration may be provided at least for the UL BWP indicated by the firstActiveUplinkBWP-Id. The rrcreeconfiguration message may also include a list (associationList) of SSB/CSI-RSs associated with the pre-allocated or configured UL grant. In an alternative embodiment, the above information for pre-allocated/configured UL grant configuration sent in rrcreeconfiguration message can be sent by the gNB in a connection release message or in a system information message to use configured UL grant in idle/inactive state. The pre-allocated/configured UL grant configuration in idle/inactive state is used for initially active UL BWP or may also indicate UL BWP. In operation S320, the UE may select an SSB/CSI-RS among the SSB/CSI RS (S) associated with the pre-allocated or configured UL grant (S). Prior to selecting the SSB/CSI-RS, the SSB/CSI RS transmitted by the cell (e.g., the target cell in case of handover) may be received at the UE.

In operation S330, the UE may determine an UL grant corresponding to the configuration of the selected SSB/CSI-RS. The configured UL grant may be associated with the SSB/CSI-RS in the "index + 1" row in the list of associated SSB/CSI-RS. If the index is [ floor (CURRENT _ symbol/period) ] modulo N1,

-wherein CURRENT _ symbol ═ (SFN × number of slot spotsperframe × number of symbol sporspot + in frame × number of symbol of symbosperspot + in slot)

Numberofslotspersframe and numberofsymbolsrslot refer to the number of consecutive slots per frame and the number of consecutive symbols per slot, respectively. The numberOfSlotsPerFrame is SCS specific and predefined for each SCS

The period (in symbol units) is a period for configuring UL grant and is signaled in RRCReconfiguration message or system information or connection release message.

SFN is the System frame number of UL grant of the allocation configuration

The slot number is the starting slot of the configured UL grant

The symbol number is the starting symbol of the configured UL grant

nrofHARQ-Processes are signaled in the RRCReconfiguration message or system information or connection release message.

N1 ═ the number of SSBs/CSI-RSs associated with the configured UL grant

In operation S340, the UE may determine the HARQ process ID for the selected configured UL grant as follows: HARQ process ID ═ floor (CURRENT _ symbol/(period N1)) ] modulonof HARQ-Processes

-wherein CURRENT _ symbol ═ (SFN × number of slot spotsperframe × number of symbol sporspot + in frame × number of symbol of symbosperspot + in slot)

Numberofslotspersframe and numberofsymbolsrslot refer to the number of consecutive slots per frame and the number of consecutive symbols per slot, respectively. The numberofslotspersframe is SCS specific and predefined for each SCS.

The period (in symbol units) is a period for configuring UL grant and is signaled in RRCReconfiguration message or system information or connection release message.

SFN is the System frame number of UL grant of the allocation configuration

The slot number is the starting slot of the configured UL grant

The symbol number is the starting symbol of the configured UL grant

Signalling nrofHARQ-Processes in RRCRECONfigure message or System information or connection Release message

N1 ═ the number of SSBs/CSI-RSs associated with the configured UL grant

In operation S350, the UE may transmit a reconfiguration complete message or UL MAC PDU in the determined UL grant corresponding to the selected SSB/CSI RS using the determined HARQ process.

Fig. 4 is a diagram illustrating a method of mapping SSB/CSI-RS, HARQ process ID, and configured UL grant according to an embodiment of the present disclosure.

Referring to fig. 4, the network may signal (e.g., in a reconfiguration message or a system information message or a connection release message) the configured grant configuration and a list of SSB/CSI RSs associated with the configured grant configuration (SSB IDs or CSI RS IDs or TCI status IDs included in the list). In an example, nrofHARQ-Processes is 2 and the number of SSBs/CSI-RSs associated with the configured grant is 2.

Fig. 5 is a flowchart illustrating a method of mapping SSB/CSI-RS, HARQ process ID and configured UL grant according to an embodiment of the present disclosure.

In operation S510, the UE may receive a rrcreeconfiguration message from the gNB. The spCellConfig in the RRCReconfiguration message may include reconfigurationWithSync. Information included in the reconfigurationWithSync IE (e.g., an indication to skip RACH) indicates that the UE will skip RACH towards the target cell. The rrcreeconfiguration message may include a pre-allocated UL grant configuration (a parameter indicating that UL grant occurs periodically). The configuration may be provided at least for the UL BWP indicated by the firstActiveUplinkBWP-Id. The rrcreeconfiguration message may also include a list (associationList) of SSB/CSI-RSs associated with the pre-allocated or configured UL grant. In an alternative embodiment, the above information for pre-allocated/configured UL grant configuration sent in rrcreeconfiguration message may be sent by the gNB in a connection release message or in a system information message to use configured UL grant in idle/inactive state. The pre-allocated/configured UL grant configuration in idle/inactive state is used for initial activation of UL BWP or may also indicate UL BWP.

In operation S520, the UE may select an SSB/CSI-RS among the SSB/CSI-RS (S) associated with the pre-allocated or configured UL grant (S). Prior to selecting the SSB/CSI-RS, the SSB/CSI RS transmitted by the cell (e.g., the target cell in case of handover) may be received at the UE.

In operation S530, the UE may determine an UL grant corresponding to the configuration of the selected SSB/CSI-RS. If the index is [ floor (CURRENT _ symbol/(period × N1)) ] module N1, the configured UL grant may be associated with the SSB/CSI-RS in the "index + 1" row in the list of associated SSB/CSI RS, where

-wherein CURRENT _ symbol ═ (SFN × number of slot spotsperframe × number of symbol sporspot + in frame × number of symbol of symbosperspot + in slot)

Numberofslotspersframe and numberofsymbolsrslot refer to the number of consecutive slots per frame and the number of consecutive symbols per slot, respectively. The numberofslotspersframe is SCS specific and predefined for each SCS.

The period (in symbol units) is a period for configuring UL grant and is signaled in RRCReconfiguration message or system information or connection release message.

SFN is the System frame number of UL grant of the allocation configuration

The slot number is the starting slot of the configured UL grant

The symbol number is the starting symbol of the configured UL grant

Signalling nrofHARQ-Processes in RRCRECONfigure message or System information or connection Release message

N1 ═ the number of SSBs/CSI-RSs associated with the configured UL grant

In operation S540, the UE may determine the HARQ process ID for the selected configured UL grant as follows:

HARQ process ID ═ floor (CURRENT _ symbol/(period)) ] modulo nrofHARQ-Processes

-wherein CURRENT _ symbol ═ (SFN × number of slot spotsperframe × number of symbol sporspot + in frame × number of symbol of symbosperspot + in slot)

Numberofslotspersframe and numberofsymbolsrslot refer to the number of consecutive slots per frame and the number of consecutive symbols per slot, respectively. The numberofslotspersframe is SCS specific and predefined for each SCS.

The period (in symbol units) is a period for configuring UL grant and is signaled in RRCReconfiguration message or system information or connection release message.

SFN is the System frame number of UL grant of the allocation configuration

The slot number is the starting slot of the configured UL grant

The symbol number is the starting symbol of the configured UL grant

Signalling nrofHARQ-Processes in RRCRECONfigure message or System information or connection Release message

In operation S550, the UE may transmit a reconfiguration complete message or UL MAC PDU in the determined UL grant corresponding to the selected SSB/CSI RS using the determined HARQ process.

Fig. 6 is a diagram illustrating a method of mapping SSB/CSI-RS, HARQ process ID, and configured UL grant according to an embodiment of the present disclosure.

Referring to fig. 6, the network may signal (e.g., in a reconfiguration message or a system information message or a connection release message) the authorized configuration of one or more configurations. Each configured grant configuration may be associated with SSB/CSI RS(s) (indicating SSB ID(s) or CSI RS ID(s) or TCI state ID (s)). In this example, there are two configurations of authorization configurations, where configuration 1 is associated with SSB ID X and configuration 2 is associated with SSB ID Y. All UL grants configured via configuration 1 belong to SSB X. All UL grants configured via configuration 1 belong to SSB Y. The HARQ process ID corresponding to each UL grant corresponding to the configuration may be determined as in existing systems or explained above.

Fig. 7 is a flowchart illustrating a method of mapping SSB/CSI-RS, HARQ process ID, and configured UL grant according to an embodiment of the present disclosure.

In operation S710, the UE may receive a rrcreeconfiguration message from the gNB. The spCellConfig in the RRCReconfiguration message may include reconfigurationWithSync. Information included in the reconfigurationWithSync IE (e.g., an indication to skip RACH) indicates that the UE will skip RACH towards the target cell. The rrcreeconfiguration message may include one or more pre-allocated/configured UL grant configurations (parameters indicating that UL grants occur periodically). These configurations may be provided at least for the UL BWP indicated by the firstActiveUplinkBWP-Id. Each pre-allocated/configured UL grant configuration may be associated with SSB/CSI RS(s) (SSB ID(s) or CSI RS ID(s) or TCI status ID(s) of SSB/CSI RS (s)) indicated/signaled by the gNB. In an alternative embodiment, the above information for pre-allocated/configured UL grant configuration sent in rrcreeconfiguration message may be sent by the gNB in a connection release message or in a system information message to use configured UL grant in idle/inactive state. The pre-allocated/configured UL grant configuration in idle/inactive state is used for initially active UL BWP or may also indicate UL BWP.

In operation S720, the UE may select an SSB/CSI-RS among the SSB/CSI RS (S) associated with the pre-allocated or configured UL grant configuration. For example, if there are two configured authorization configurations and configuration 1 is associated with SSB X and configuration 2 is associated with SSB Y, the UE selects SSB from SSB X and SSB Y. Prior to selecting the SSB/CSI-RS, the SSB/CSI RS transmitted by the cell (e.g., the target cell in case of handover) may be received at the UE.

In operation S730, the UE may determine an UL grant configuration associated with the selected SSB/CSI-RS. The UE may determine the UL grant from the selected UL grant configuration.

In operation S740, the UE may determine a HARQ process ID for the UL grant of the configuration determined from the selected configurations as follows:

HARQ process ID ═ floor (CURRENT _ symbol/(period)) ] modulo nrofHARQ-Processes

-wherein CURRENT _ symbol ═ (SFN × number of slot spotsperframe × number of symbol sporspot + in frame × number of symbol of symbosperspot + in slot)

Numberofslotspersframe and numberofsymbolsrslot refer to the number of consecutive slots per frame and the number of consecutive symbols per slot, respectively. The numberofslotspersframe is SCS specific and predefined for each SCS.

The periodicity (in symbols) is the period in which the UL grant is configured in the selected UL grant configuration.

SFN is the System frame number of UL grant of the allocation configuration

The slot number is the starting slot of the configured UL grant

The symbol number is the starting symbol of the configured UL grant

Signaling nrofHARQ-Processes in the selected UL grant configuration

In operation S750, the UE may transmit a reconfiguration complete message or UL MAC PDU in the determined UL grant corresponding to the selected SSB/CSI RS using the determined HARQ process.

Fig. 8 is a diagram illustrating a method of mapping SSB/CSI-RS, HARQ process ID, and configured UL grant according to an embodiment of the present disclosure.

Referring to fig. 8, the network may signal (e.g., in a reconfiguration message or a system information message or a connection release message) the authorized configuration of one or more configurations. Each configured grant configuration is associated with SSB/CSI RS(s) (indicating SSB ID(s) or CSI RS ID(s) or TCI state ID (s)). Fig. 8 is an example illustration of a mapping between HARQ process IDs, SSB/CSI-RS and configured UL grants. In an example, there are two configurations of authorization configurations, where configuration 1 is associated with SSB ID X and configuration 2 is associated with SSB ID Y. All UL grants configured via configuration 1 belong to SSB X. All UL grants configured via configuration 1 belong to SSB Y. The starting HARQ process ID for configuration 1 is 0. The starting HARQ process ID for configuration 2 is "0 + nrofHARQ-Processes for configuration 1". The starting HARQ process ID for the ith configuration is "0 + nrofHARQ-Processes + for configuration 1 + nrofHARQ-Processes for configuration 'i-1'.

Fig. 9 is a flowchart illustrating a method of mapping SSB/CSI-RS, HARQ process ID, and configured UL grant according to an embodiment of the present disclosure.

In operation S910, the UE may receive a rrcreeconfiguration message from the gNB. The spCellConfig in the RRCReconfiguration message may include reconfigurationWithSync. Information included in the reconfigurationWithSync IE (e.g., an indication to skip RACH) indicates that the UE will skip RACH towards the target cell. The rrcreeconfiguration message may include one or more pre-allocated/configured UL grant configurations (parameters indicating that UL grants occur periodically). These configurations are provided at least for the UL BWP indicated by the firstactiveuplinkp-Id. Each pre-allocated/configured UL grant configuration is associated with SSB/CSI RS (SSB ID(s) or CSI RS ID(s) or TCI status ID (s)) of the associated SSB/CSI RS(s) as indicated/signaled by the gNB. In an alternative embodiment, the above information for pre-allocated/configured UL grant configuration sent in rrcreeconfiguration message may be sent by the gNB in a connection release message or in a system information message to use configured UL grant in idle/inactive state. The pre-allocated/configured UL grant configuration in idle/inactive state is used for initially active UL BWP or may also indicate UL BWP.

In operation S920, the UE may select an SSB/CSI-RS among the SSB/CSI RS (S) associated with the pre-allocated or configured UL grant configuration. For example, if there are two configured authorization configurations and configuration 1 is associated with SSB X and configuration 2 is associated with SSB Y, the UE selects SSB from SSB X and SSBY. Prior to selecting the SSB/CSI-RS, the SSB/CSI RS transmitted by the cell (e.g., the target cell in case of handover) may be received at the UE.

In operation S930, the UE may determine an UL grant configuration associated with the selected SSB/CSI-RS. The UE selects an UL grant from the selected UL grant configuration.

In operation S940, the UE may determine a HARQ process ID for the UL grant of the selected configuration from the selected configurations as follows:

HARQ process ID ═ offset + [ floor (CURRENT _ symbol/(period)) ] modulonof HARQ-Processes

-wherein CURRENT _ symbol ═ (SFN × number of slot spotsperframe × number of symbol sporspot + in frame × number of symbol of symbosperspot + in slot)

Numberofslotspersframe and numberofsymbolsrslot refer to the number of consecutive slots per frame and the number of consecutive symbols per slot, respectively. The numberofslotspersframe is SCS specific and predefined for each SCS.

The periodicity (in symbols) is the period in which the UL grant is configured in the selected UL grant configuration.

SFN is the System frame number of UL grant of the allocation configuration

The slot number is the starting slot of the configured UL grant

The symbol number is the starting symbol of the configured UL grant

Signaling nrofHARQ-Processes in the selected UL grant configuration

-offset for the ith UL grant configuration is 0+ nrofHARQ-Processes for configuration 1 +. + nrofHARQ-Processes for configuration "i-1

In an alternative embodiment, the "offset" can be signaled in the authorization configuration of each configuration. If no "offset" is signaled for the configured grant configuration, it is assumed to be zero.

The UE may then transmit a reconfiguration complete message or UL MAC PDU in the selected UL grant corresponding to the selected SSB/CSI RS using the selected HARQ process in operation S950.

According to another embodiment, the UE may receive a rrcreeconfiguration message from the gNB. The spCellConfig in the RRCReconfiguration message may include reconfigurationWithSync. Information in the reconfigurationWithSync IE (e.g., an indication to skip RACH) indicates that the UE will skip RACH towards the target cell. The rrcreeconfiguration message includes a configured UL grant configuration (a parameter indicating that UL grant occurs periodically). These configurations are provided at least for the UL BWP indicated by the firstactiveuplinkp-Id. In an alternative embodiment, the above information for pre-allocated/configured UL grant configuration sent in rrcreeconfiguration message may be sent by the gNB in a connection release message or in a system information message to use configured UL grant in idle/inactive state. The pre-allocated/configured UL grant configuration in idle/inactive state is used for initially active UL BWP or may also indicate UL BWP.

The UE may identify whether it can apply the UL grant indicated in the configured UL grant configuration before the non-RACH reconfiguration with synchronization is complete, as described below.

Option 1: UL grant configuration for configuration with synchronized no RACH reconfiguration is configured separately, e.g. using a new IE configuredgontconfigrachless. If the IE is included in the RRCReconfiguration message, the UE uses the UL grant indicated in the IE for RACH-less reconfiguration with synchronization.

Option 2: UL grant configurations for configurations with synchronized no RACH reconfiguration are not configured separately. The UE uses the UL grant indicated in the grant configuration for no RACH reconfiguration with synchronization if the grant configuration includes the associated SSB/CSI-RS or if a list of SSB/CSI-RS associated with the grant configuration is signaled.

Fig. 10 is a flowchart of a method of mapping SSB/CSI-RS, HARQ process ID, and configured UL grant at a UE according to an embodiment of the present disclosure.

In operation S1010, the UE may receive Uplink (UL) grant configuration information via an RRC reconfiguration message. The UL grant configuration information may include at least one of a RACH skip indication, a pre-allocated UL grant configuration, and a list associated with the pre-allocated UL grant.

In operation S1020, the UE may select an SSB/CSI-RS among a plurality of SSB/CSI-RSs included in the UL grant information. The UE may obtain a list indicating SSB/CSI RSs for a plurality of UL grant configurations from the UL grant configuration information. The SSB/CSI-RS is selected according to at least one of the foregoing embodiments or a combination of the foregoing embodiments.

In operation S1030, the UE may determine an UL grant corresponding to the selected SSB/CSI-RS and a HARQ process corresponding to the UL grant based on each of the plurality of UL grant configurations. The UL grant is selected according to at least one of the foregoing embodiments or a combination of the foregoing embodiments.

In operation S1040, the UE may control the transceiver to transmit a reconfiguration complete message or UL MAC PDU in the determined UL grant corresponding to the selected SSB/CSI RS using the HARQ process. The HARQ process is determined according to at least one of the preceding embodiments or a combination of the preceding embodiments.

Fig. 11 is a flowchart of a method of mapping SSB/CSI-RS, HARQ process ID, and configured UL grant at a base station according to an embodiment of the present disclosure.

In operation S1110, the base station may transmit Uplink (UL) grant configuration information via an RRC reconfiguration message. The UL grant configuration information may include at least one of a RACH skip indication, a pre-allocated UL grant configuration, and a list associated with the pre-allocated UL grant.

In operation S1120, the base station may receive a reconfiguration complete message or UL MAC PDU in the UL grant corresponding to the SSB/CSI RS selected at the UE from the UE using the HARQ process. An SSB/CSI RS is selected among a plurality of SSB/CSI RSs included in the UL grant information, and a UL grant corresponding to the selected SSB/CSI RS and a HARQ process corresponding to the UL grant are determined based on the UL grant information. Fig. 12 is a diagram illustrating a UE 1200 according to an embodiment of the present disclosure.

Referring to fig. 12, a UE 1200 may include a processor 1210, a transceiver 1220, and a memory 1230. However, all of the illustrated components are not required. UE 1200 may be implemented with more or fewer components than shown in fig. 12. In addition, according to another embodiment, the processor 1210 and the transceiver 1220 and the memory 1230 may be implemented as a single chip.

The above-described components will now be described in detail.

Processor 1210 may include one or more processors or other processing devices that control the proposed functions, processes, and/or methods. The operations of UE 1200 may be performed by processor 1210.

The processor 1210 may control the transceiver 1220 to receive Uplink (UL) grant configuration information via an RRC reconfiguration message. Processor 1210 may select an SSB/CSI RS among a plurality of SSB/CSI RSs included in the UL grant information. Processor 1210 can determine a UL grant corresponding to the selected SSB/CSI RS and a HARQ process corresponding to the UL grant based on the UL grant information. Processor 1210 may control transceiver 1220 to transmit a reconfiguration complete message or an UL MAC PDU in a determined UL grant corresponding to the selected SSB/CSI RS using a HARQ process.

The transceiver 1220 may be connected to the processor 1210 and transmit and/or receive signals. The signal may include an RRC reconfiguration message or UL data. In addition, the transceiver 1220 may receive a signal through a wireless channel and output the signal to the processor 1210. The transceiver 1220 may transmit a signal output from the processor 1210 through a wireless channel.

Memory 1230 may store control information or data included in signals obtained by UE 1200. Memory 1230 may be connected to processor 1210 and store at least one instruction and protocol and parameters for the proposed function, process, and/or method. Memory 1230 may include read-only memory (ROM) and/or random-access memory (RAM) and/or a hard disk and/or a CD-ROM and/or DVD and/or other storage devices.

Fig. 13 is a diagram illustrating a base station 1300 according to an embodiment of the present disclosure.

Referring to fig. 13, a base station 1300 may include a processor 1310, a transceiver 1320, and a memory 1330. However, all of the illustrated components are not required. Base station 1300 may be implemented with more or fewer components than shown in fig. 13. In addition, according to another embodiment, the processor 1310 and the transceiver 1320, and the memory 1330 may be implemented as a single chip.

The above-described components will now be described in detail.

Processor 1310 may include one or more processors or other processing devices that control the proposed functions, processes, and/or methods. The operations of base station 1300 may be performed by processor 1310.

The processor 1310 may control the transceiver 1320 to transmit Uplink (UL) grant configuration information via an RRC reconfiguration message. Processor 1310 may control transceiver 1320 to receive a reconfiguration complete message from a User Equipment (UE) using a HARQ process in a UL grant corresponding to a selected SSB/CSI RS at the UE.

The transceiver 1320 may be connected to the processor 1310 and transmit and/or receive signals. The signal may include control information and data. In addition, the transceiver 1320 may receive a signal through a wireless channel and output the signal to the processor 1310. The transceiver 1320 may transmit a signal output from the processor 1310 through a wireless channel.

The memory 1330 may store control information or data included in signals obtained by the base station 1300. The memory 1330 may be connected to the processor 1310 and store at least one instruction and protocol and parameters for the proposed function, process, and/or method. The memory 1330 may include read-only memory (ROM) and/or random-access memory (RAM) and/or a hard disk and/or CD-ROM and/or DVD and/or other storage devices. At least some of the example embodiments described herein may be constructed, in part or in whole, using dedicated hardware. Terms such as "component," "module," or "unit" as used herein may include, but are not limited to, a hardware device, such as a circuit in discrete or integrated component form, a Field Programmable Gate Array (FPGA), or an Application Specific Integrated Circuit (ASIC), which performs certain tasks or provides related functions. In some embodiments, the described elements may be configured to reside on a tangible, persistent, addressable storage medium and may be configured to run on one or more processors. In some embodiments, these functional elements may include components, such as software components, object-oriented software components, class components and task components, processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables, as examples. Although example embodiments have been described with reference to components, modules, and units discussed herein, such functional elements may be combined into fewer elements or separated into additional elements. Various combinations of optional features have been described herein, and it should be understood that the described features may be combined in any suitable combination. In particular, features of any one example embodiment may be combined with features of any other embodiment as appropriate, unless such combinations are mutually exclusive. Throughout the specification, the term "comprising" or "comprises" is intended to include the specified component(s), but not to exclude the presence of other components.

Attention is directed to all papers and documents which are filed concurrently with or previous to this specification in connection with this application and which are open to public inspection with this specification, and the contents of all such papers and documents are incorporated herein by reference.

All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and/or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations where at least some of such features and/or steps are mutually exclusive.

Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features.

The present disclosure is not limited to the details of the foregoing embodiment(s). The disclosure extends to any novel one, or any novel combination, of the features disclosed in this specification (including any accompanying claims, abstract and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed.

While the present disclosure has been described with various embodiments, various changes and modifications may be suggested to one skilled in the art. The present disclosure is intended to embrace these changes and modifications as fall within the scope of the appended claims.