User terminal and wireless communication method
阅读说明:本技术 用户终端以及无线通信方法 (User terminal and wireless communication method ) 是由 武田一树 永田聪 王理惠 侯晓林 于 2018-01-12 设计创作,主要内容包括:对上行控制信道决定适当的空间资源。用户终端具有:接收单元,通过高层来接收与用于上行控制信道的空间资源有关的信息的多个条目,并通过下行共享信道来接收用于指定所述多个条目中的至少一个条目的指定信息;以及控制单元,根据对于所述下行共享信道的送达确认信息的反馈定时、以及基于所述指定信息的空间资源的应用定时,控制所述送达确认信息的发送。(An appropriate spatial resource is determined for the uplink control channel. The user terminal has: a reception unit configured to receive, through a higher layer, a plurality of entries of information on spatial resources for an uplink control channel and receive, through a downlink shared channel, specification information for specifying at least one entry among the plurality of entries; and a control unit configured to control transmission of the acknowledgement information according to a feedback timing of the acknowledgement information for the downlink shared channel and an application timing of the spatial resource based on the specification information.)
1. A user terminal, comprising:
a reception unit configured to receive, through a higher layer, a plurality of entries of information on spatial resources for an uplink control channel and receive, through a downlink shared channel, specification information for specifying at least one entry among the plurality of entries; and
and a control unit configured to control transmission of the acknowledgement information according to a feedback timing of the acknowledgement information for the downlink shared channel and an application timing of the spatial resource based on the specification information.
2. The user terminal of claim 1,
the control unit determines whether or not to apply the spatial resource specified by the specification information to transmission of the delivery acknowledgement information, based on a relationship between the feedback timing and the application timing.
3. The user terminal of claim 2,
the control unit determines whether to transmit the delivery acknowledgement information based on a relationship between the feedback timing and the application timing.
4. The user terminal according to any of claims 1 to 3,
the control unit determines different feedback timings according to whether the downlink shared channel contains the designated information.
5. The user terminal according to any of claims 1 to 4,
the control unit applies a predetermined spatial resource to transmission of the acknowledgement information when downlink control information for scheduling the downlink shared channel does not include the instruction of the feedback timing.
6. A wireless communication method of a user terminal, comprising:
a step of receiving a plurality of entries of information on spatial resources for an uplink control channel through a higher layer and receiving specification information for specifying at least one entry of the plurality of entries through a downlink shared channel; and
and controlling transmission of the acknowledgement information based on feedback timing of acknowledgement information for the downlink shared channel and the downlink shared channel.
Technical Field
The present disclosure relates to a user terminal and a wireless communication method in a next generation mobile communication system.
Background
In a UMTS (Universal Mobile Telecommunications System) network, Long Term Evolution (LTE) is standardized for the purpose of higher data rate, lower latency, and the like (non-patent document 1). Further, for the purpose of further widening LTE bandwidth and increasing LTE speed, systems following LTE (for example, also referred to as LTE-a (LTE-Advanced), FRA (Future Radio Access), 4G, 5G + (5G plus), nr (new rat), LTE rel.14, 15 and beyond) have been studied.
In a conventional LTE system (e.g., LTE rel.8-13), communication of a Downlink (DL) and/or an Uplink (UL) is performed using a subframe of 1ms (also referred to as a Transmission Time Interval (TTI) or the like). The subframe is a transmission time unit of one data packet after channel coding, and is a processing unit of scheduling, link adaptation, retransmission control (HARQ), Hybrid Automatic Repeat reQuest, and the like.
In addition, in the conventional LTE system (e.g., LTE rel.8-13), the user terminal transmits Uplink Control Information (UCI) using an Uplink Control Channel (e.g., PUCCH: Physical Uplink Control Channel) or an Uplink data Channel (e.g., PUSCH: Physical Uplink Shared Channel). The structure (Format) of the uplink control channel is called PUCCH Format (PF: PUCCH Format) or the like.
Disclosure of Invention
Problems to be solved by the invention
In future wireless communication systems (e.g., LTE rel.14 or later, NR, 5G, or the like), communication using Beam Forming (BF) is being studied.
The user terminal determines spatial resources (e.g., beams) and uplink control channel resources, and transmits the uplink control channel using the resources. However, if the uplink control channel is not transmitted using an appropriate spatial resource, there is a concern that a problem such as a decrease in communication quality may occur.
Therefore, an object of the present disclosure is to provide a user terminal and a wireless communication method for determining an appropriate spatial resource for an uplink control channel.
Means for solving the problems
A user terminal according to an aspect of the present disclosure includes: a reception unit configured to receive, through a higher layer, a plurality of entries of information on spatial resources for an uplink control channel and receive, through a downlink shared channel, specification information for specifying at least one entry among the plurality of entries; and a control unit configured to control transmission of the acknowledgement information according to a feedback timing of the acknowledgement information for the downlink shared channel and an application timing of the spatial resource based on the specification information.
Effects of the invention
According to one aspect of the present disclosure, an appropriate spatial resource can be determined for an uplink control channel.
Drawings
Fig. 1 is a diagram illustrating an example of a plurality of candidate beams used for PUCCH transmission.
Fig. 2 is a diagram showing an example of the relationship between the feedback timing of HARQ-ACK and the effective timing of spatial information MAC CE.
Fig. 3 is a diagram showing an example of feedback timing in the first embodiment.
Fig. 4 is a diagram showing an example of feedback timing for a PDSCH not including spatial information MAC CE.
Fig. 5 is a diagram showing an example of feedback timing for a PDSCH including spatial information MAC CE.
Fig. 6 is a diagram showing an example of a schematic configuration of a wireless communication system according to the present embodiment.
Fig. 7 is a diagram showing an example of the overall configuration of the radio base station according to the present embodiment.
Fig. 8 is a diagram showing an example of a functional configuration of the radio base station according to the present embodiment.
Fig. 9 is a diagram showing an example of the overall configuration of the user terminal according to the present embodiment.
Fig. 10 is a diagram showing an example of a functional configuration of the user terminal according to the present embodiment.
Fig. 11 is a diagram showing an example of the hardware configuration of the radio base station and the user terminal according to the present embodiment.
Detailed Description
In future wireless communication systems (e.g., LTE rel.14 or later, NR, 5G, or the like), communication using Beam Forming (BF) is being studied.
For example, a user terminal and/or a radio base station (e.g., a gnb (gnnodeb)) may utilize a beam (also referred to as a transmission beam, a Tx beam, etc.) for transmitting signals, and a beam (also referred to as a reception beam, an Rx beam, etc.) for receiving signals. The combination of the transmit Beam at the transmit side and the receive Beam at the receive side may also be referred to as a Beam Pair Link (BPL).
The user terminal and/or the radio base station may decide the beam based on the measurement of the reference RS. The reference RS (referencesignal) may be at least one of a Synchronization Signal Block (SSB), a Channel State Information (CSI-RS) for Channel State measurement (CSI-RS), and a sounding RS (SRS: sounding reference Signal). The SSB may also be referred to as an SS/PBCH (Physical broadcast channel) block or the like.
Setting of a plurality of candidate beams for PUCCH transmission as shown in fig. 1 by PUCCH Spatial correlation Information (PUCCH Spatial correlation Information) is being studied. The PUCCH spatial association information is notified to the UE through a higher layer (e.g., RRC signaling).
The PUCCH spatial association information may also be a list of structures that refer to spatial associations between RSs and PUCCHs. The PUCCH spatial association information contains at least one entry (PUCCH spatial association information IE (information element)). Each entry may represent an ID associated with the reference RS. Specifically, each entry may contain at least one of an SSB index, a Non-Zero Power (NZP) -CSI-RS resource structure ID, and an SRS resource structure ID. The SSB index, NZP-CSI-RS resource structure ID, and SRS resource structure ID may be associated with a beam, resource, and/or port selected by measurement of the reference CS.
One of the plurality of entries (candidate beam or PUCCH spatial association information) may be indicated by a MAC (media access Control) CE (Control Element). The MAC CE may also be referred to as a spatial information MAC CE. The spatial information MAC CE may indicate an index of an entry for PUCCH transmission. When the PUCCH space-related information includes one PUCCH space-related information IE, the MAC CE may not be used.
If the UE determines one entry, the UE may transmit the PUCCH based on the PUCCH space association information associated with the entry. In case that the reference RS is a downlink RS (SSB or CSI-RS), the entry is associated with a reception beam selected based on measurement of the reference RS, and the UE may transmit the PUCCH using a transmission beam corresponding to the reception beam associated to the entry. Alternatively, the base station receiver may transmit the PUCCH using a transmission beam, precoding, antenna port, antenna panel, and the like, which can assume a spatial QCL (Quasi Co-Location) with the downlink RS (SSB or CSI-RS) associated with the entry. In case that the reference RS is an uplink RS (srs), the entry is associated with a transmission beam selected based on the measurement of the reference RS, and the UE may transmit the PUCCH using the transmission beam associated with the entry. Alternatively, the base station receiver may transmit the PUCCH using a transmission beam, precoding, antenna port, antenna panel, and the like, which can assume the spatial QCL with the uplink rs (srs) associated with the entry. Hereinafter, for simplicity, the above PUCCH space-related information is referred to as a PUCCH beam, a transmission beam, an uplink beam, and a beam.
On the other hand, it is being studied to dynamically set PUCCH resources using DCI (Downlink Control Information). Therefore, the granularity of controlling the timing of the beam for the PUCCH by the MAC CE is coarser than the granularity of controlling the timing of the PUCCH resource by the DCI. In other words, it is difficult to specify one beam of one PUCCH resource for dynamic decision by the MAC CE.
For example, as shown in fig. 2, the processing time for PUCCH UL beam control by MAC CE is x slots, and the processing time for HARQ-ACK is y slots. Spatial information MAC CE becomes valid after slot n + x relative to PDSCH carrying spatial information MAC CE for PUCCH, which is transmitted in slot n + y. At this time, x and y are not limited to be equal.
Furthermore, even if the UE receives DCI scheduling the PDSCH carrying the spatial information MAC CE, the UE may fail to decode the MAC CE. When an error occurs in the PDSCH, the timing of applying the spatial information MAC CE is delayed from the time slot n + y since the PDSCH including the MAC CE is retransmitted and successfully received and decoded. That is, the timing at which HARQ-ACK is applied (feedback timing) may not coincide with the timing at which spatial information MAC CE becomes effective (effective timing, or timing at which spatial information MAC CE is applied (application timing)).
For example, when x is 8 slots (for example, the same as in the conventional LTE system) and y is 2 slots, the feedback timing of HARQ-ACK (slot n +2) is earlier than the effective timing of spatial information MAC CE (slot n + 8). In the case of transmitting MACCE in slot n, the wireless base station cannot expect to be able to implement a transmission beam in slot n + 8.
Therefore, the present inventors have studied the control of HARQ-ACK transmission applicable to spatial information MAC CE, and have completed the present invention.
Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The embodiments may be applied individually or in combination.
Multiple PUCCH resource sets may be set by a higher layer (e.g., RRC signaling). Each PUCCH resource set includes a plurality of PUCCH resources. When transmitting UCI (Uplink Control Information) using a PUCCH, the UE determines one PUCCH resource set from a plurality of PUCCH resource sets based on a payload of the UCI. The UE decides one PUCCH resource from the decided PUCCH resource set based on the PUCCH resource indication.
The PUCCH resource indication may be a DCI indication (a specific field within DCI), a specific parameter (implicit indication), or a combination thereof. The specific parameter may be at least one of a CCE (Control Channel Element) index, a specific PRB (Physical Resource Block) index of the scheduled PDSCH, a UE-ID, and a C-RNTI (Cell-Radio Network Temporary Identifier).
The UE may decide PUCCH resources based on the kind of UCI. For example, in the case where UCI is only CSI (Channel state information), the UE may decide one PUCCH resource for CSI set by a higher layer. For example, when UCI is HARQ-ACK, the UE may determine a PUCCH resource set according to the number of bits of HARQ-ACK from among a plurality of PUCCH resource sets for HARQ-ACK set by a higher layer, and may determine the PUCCH resource by a specific field of DCI for scheduling PDSCH corresponding to HARQ-ACK.
The MAC CE may indicate a plurality of entries corresponding to a plurality of PUCCH resource candidates specifiable by DCI among a plurality of entries of PUCCH space-related information set by a higher layer. This MAC CE is sometimes referred to as spatial information MAC CE. The spatial information MAC CE may represent an entry within the PUCCH spatial association information by its index (entry index).
The UE can control a beam for the PUCCH by applying an entry shown by the spatial information MAC CE to PUCCH transmission.
By specifying an entry for a dynamically settable PUCCH resource in advance by spatial information MAC CE, the UE can control a beam for the dynamically settable PUCCH resource.
In addition, the following illustrates a slot as a time unit, but the time unit may be replaced with any one of a symbol, a subframe, a sub-slot, a radio frame, and the like.
(first mode)
The UE may control spatial association information to be applied to a PUCCH transmitting the HARQ-ACK according to whether HARQ-ACK feedback for a PDSCH carrying spatial information MAC CE is earlier, equal, or later than the effective timing of the spatial information MAC CE.
The wireless base station may indicate HARQ-ACK resources (e.g., HARQ-ACK timing indication information) for a PDSCH including spatial information MAC CE through DCI for scheduling the PDSCH. The feedback timing of HARQ-ACK specified by the DCI may be after the effective timing of the spatial information MAC CE.
As shown in fig. 3, when the instructed feedback timing is the valid timing (slot n + x) or later, the UE transmits HARQ-ACK through PUCCH to which the entry indicated by the spatial information MAC CE is applied. By this operation, the spatial information MAC CE can be reliably applied in HARQ-ACK transmission for the spatial information MAC CE, and reception performance of the PUCCH can be improved.
Any of the following
<
When the feedback timing of the HARQ-ACK is earlier than the effective timing of the spatial information MAC CE, the UE may not have to transmit the HARQ-ACK by using the PUCCH of the entry indicated by the spatial information MAC CE.
In modification 1-1, any of the following options 1-1 and 1-2 can be applied.
Options 1-1
The UE may transmit HARQ-ACK by using PUCCH of the following entry: the entry indicated by the spatial information MAC CE included in the PDSCH corresponding to the HARQ-ACK is not the entry indicated by the spatial information MAC CE but the entry indicated by the spatial information MAC CE which is earlier than the HARQ-ACK transmission and which is valid last. By this operation, even in the case where the valid timing of the spatial information mac ce corresponding to HARQ-ACK is not up to HARQ-ACK transmission, other entries (e.g., beams) can be applied to HARQ-ACK transmission.
Options 1-2
The UE may transmit the HARQ-ACK through a PUCCH using default spatial association information set in advance or defined. By this operation, even in the case where the effective timing of the spatial information MAC CE corresponding to HARQ-ACK is not up to HARQ-ACK transmission, other entries (e.g., beams) can be applied to HARQ-ACK transmission. The default spatial correlation information may be spatial correlation information corresponding to an entry having the smallest index among entries of PUCCH spatial correlation information, or may be spatial correlation information set separately by broadcast information or higher layer signaling such as RRC.
< modification 2>
The UE may not transmit the HARQ-ACK when the feedback timing of the HARQ-ACK is earlier than the effective timing of the spatial information MAC CE. According to this operation, an entry specified by spatial information MACCE within the corresponding PDSCH must be applied in the transmitted HARQ-ACK.
According to the above first aspect, the UE and the radio base station can decide HARQ-ACK transmission and an entry (e.g., beam) to be applied to the HARQ-ACK transmission by the feedback timing of HARQ-ACK and the effective timing of spatial information MAC CE.
(second mode)
The UE may decide the feedback timing of HARQ-ACK for the PDSCH according to whether the PDSCH carries (contains) spatial information MAC CE.
As shown in fig. 4, when spatial information MAC CE is not included in PDSCH, the feedback timing of HARQ-ACK may be a predetermined time after the PDSCH. For example, when the predetermined time is 4 slots, if the UE receives a PDSCH not including spatial information MAC CE in slot n, it may transmit HARQ-ACK corresponding to the PDSCH in slot n + 4. The predetermined time may be determined based on information included in DCI for scheduling the PDSCH including spatial information MAC CE.
As shown in fig. 5, when spatial information MAC CE is included in PDSCH, the feedback timing of HARQ-ACK may be equal to the effective timing of spatial information MAC CE. For example, when the valid timing of the spatial information MAC CE is slot n +8 with respect to the PDSCH including the spatial information MAC CE in slot n, the UE may transmit HARQ-ACK corresponding to the PDSCH in slot n + 8.
Alternatively, when the PDSCH includes spatial information MAC CE, the UE may transmit HARQ-ACK at least at the valid timing of the spatial information MAC CE. In this case, HARQ-ACK may be transmitted after a predetermined time from the PDSCH (for example, after a predetermined time determined based on information included in DCI for scheduling the PDSCH including the spatial information MAC CE) in addition to the validity timing of the spatial information MAC CE. According to this method, since it is possible to omit control of canceling (suspending) HARQ-ACK when it is ready at a time point after a predetermined time from the PDSCH (for example, after a predetermined time determined based on information included in DCI for scheduling the PDSCH including spatial information MAC CE), it is possible to avoid complication of terminal processing.
According to the second aspect described above, the UE can control the feedback timing of HARQ-ACK for the PDSCH based on the content of the PDSCH. Further, the effective timing of the spatial information MAC CE can be prioritized over the feedback timing of HARQ-ACK. Thus, the spatial information MAC CE can be reliably applied to HARQ-ACK for PDSCH including the spatial information MAC CE. Furthermore, by making the feedback timing of the PDSCH not including the spatial information MAC CE earlier than the feedback timing of the PDSCH including the spatial information MAC CE, the delay can be reduced.
Further, this scheme is effective in a case where DCI scheduling PDSCH does not include HARQ-ACK timing indication information. This case is, for example, the case where the DCI is a fallback DCI or a compact DCI, and may also be the case in the initial access.
(third mode)
When DCI for scheduling a PDSCH cannot change the feedback timing of HARQ-ACK for the PDSCH, for example, when the DCI does not include HARQ-ACK timing indication information, the UE may transmit a PUCCH using preset spatial information. In this case, the spatial information is not changed according to the MAC CE.
The preset spatial information may be any of an entry, PUCCH spatial association information IE, and a beam. The preset spatial information may be fixed by a specification or (semi-statically) set by a higher layer (e.g., RRC signaling).
According to the third aspect described above, by not changing the spatial information with the MAC CE, it is possible to prevent a processing delay due to decoding and applying the spatial information MAC CE.
(fourth mode)
Spatial information MAC CE indicating spatial information for PUCCH resources will be described. The spatial information may represent an entry of PUCCH spatial association information, and may be an entry index, for example. The structure of the spatial information MAC CE may be any one of the following
<
Spatial information for one PUCCH resource may be shown by the MAC CE.
The PUCCH resource may be indicated from the radio base station for HARQ-ACK for PDSCH including spatial information MAC CE. For example, the PUCCH resources may be indicated by DCI and/or other parameters scheduling the PDSCH. The PUCCH resource may represent timing and/or resources of HARQ-ACK.
The UE can recognize spatial information for which PUCCH resource the spatial information MAC CE represents through timing and/or resources of HARQ-ACK.
< Structure 2>
Spatial information for at least one PUCCH resource available may be shown by the MAC CE for one PUCCH resource set.
The at least one PUCCH resource available may belong to a PUCCH resource set for HARQ-ACK, which is HARQ-ACK for PDSCH containing spatial information MAC CE.
The UE can recognize spatial information for which PUCCH resource set the spatial information MAC CE represents through a payload of HARQ-ACK or UCI.
Furthermore, the UE can identify for which PUCCH resource the spatial information MAC CE indicates spatial information by a header field of the spatial information MAC CE. The spatial information MAC CE may include an indication field for specifying an entry corresponding to each PUCCH resource.
One of the at least one PUCCH resource available may also be indicated by DCI and/or other parameters used to schedule the PDSCH containing spatial information MAC CE.
< Structure 3>
For the at least one PUCCH resource set available, spatial information for the at least one PUCCH resource available may be shown by the MAC CE.
The at least one PUCCH resource that may be available may belong to at least one PUCCH resource set that may be available for HARQ-ACK, which is HARQ-ACK for PDSCH including spatial information MAC CE.
The UE may identify spatial information for which PUCCH resource belonging to which PUCCH resource set the spatial information MAC CE represents, through a header field of the spatial information MAC CE. For example, when 4 PUCCH resource sets are set for a UE by a higher layer and each PUCCH resource set includes 8 PUCCH resources, the spatial information MAC CE specifies entries corresponding to the 32 PUCCH resources. The spatial information MAC CE may include an indication field for specifying an entry corresponding to each PUCCH resource.
One of the at least one PUCCH resource available may also be indicated by DCI and/or other parameters for scheduling the PDSCH containing spatial information mac ce.
According to the fourth aspect described above, since an entry corresponding to a PUCCH resource can be specified by the MAC CE from among a plurality of entries in PUCCH spatial association information set by a higher layer, the UE can switch spatial information (beam) to be applied to the PUCCH by the MAC CE.
(Wireless communication System)
The configuration of the radio communication system according to the present embodiment will be described below. In this wireless communication system, communication is performed by using at least one combination of the above-described plurality of schemes.
Fig. 6 is a diagram showing an example of a schematic configuration of a wireless communication system according to the present embodiment. In the
The
The
The
In addition, the
The parameter set may refer to communication parameters applied to transmission and/or reception of a certain signal and/or channel, and may represent, for example, at least one of subcarrier spacing, bandwidth, symbol length, cyclic prefix length, subframe length, TTI length, number of symbols per TTI, radio frame structure, filtering process, windowing process, and the like.
The connection between the
The
The
Each
In the
OFDMA is a multicarrier transmission scheme in which a frequency band is divided into a plurality of narrow frequency bands (subcarriers) and data is mapped to each subcarrier to perform communication. SC-FDMA is a single carrier transmission scheme in which a system bandwidth is divided into 1 or more contiguous resource blocks per terminal, and a plurality of terminals use different bands to reduce interference between terminals. The uplink and downlink radio access schemes are not limited to these combinations, and other radio access schemes may be used.
In the
The Downlink L1/L2 Control Channel includes at least one of a Downlink Control Channel (PDCCH (Physical Downlink Control Channel) and/or an EPDCCH (Enhanced Physical Downlink Control Channel)), a PCFICH (Physical Control Format Indicator Channel), and a PHICH (Physical Hybrid-ARQ Indicator Channel). Downlink Control Information (DCI) including scheduling Information of the PDSCH and/or the PUSCH is transmitted through the PDCCH.
In addition, the scheduling information may also be notified through DCI. For example, DCI scheduling DL data reception may be referred to as DL allocation, and DCI scheduling UL data transmission may be referred to as UL grant.
The number of OFDM symbols for PDCCH is transmitted through PCFICH. Transmission acknowledgement information (for example, also referred to as retransmission control information, HARQ-ACK, ACK/NACK, and the like) of HARQ (Hybrid Automatic Repeat reQuest) for PUSCH is transmitted through PHICH. EPDCCH and PDSCH (downlink shared data channel) are frequency division multiplexed, and are used for transmitting DCI and the like in the same manner as PDCCH.
In the
In the
< radio base station >
Fig. 7 is a diagram showing an example of the overall configuration of the radio base station according to the present embodiment. The
User data transmitted from the
In baseband
Transmission/
On the other hand, as for the uplink signal, the radio frequency signal received by the transmission/
The baseband
The
Further, the transmission/
Transmission/
Furthermore, transmission/
Further, the transmission/
Further, the transmitting and receiving
Fig. 8 is a diagram showing an example of a functional configuration of the radio base station according to the present embodiment. In this example, the functional blocks of the characteristic parts in the present embodiment are mainly shown, and it is conceivable that the
The baseband
The control unit (scheduler) 301 performs overall control of the
The
The
Transmission
For example, transmission
Received
Received
The
For example, the
< user terminal >
Fig. 9 is a diagram showing an example of the overall configuration of the user terminal according to the present embodiment. The
The radio frequency signal received through the transmission and
The baseband
On the other hand, uplink user data is input from the
Transmission/
Further, the transmission/
Further, transmission/
Furthermore, transmission/
Further, transmission/
Further, the transmission/
Fig. 10 is a diagram showing an example of a functional configuration of the user terminal according to the present embodiment. In this example, the functional blocks of the characteristic parts in the present embodiment are mainly shown, but it is also conceivable that the
The baseband
The
The
The
The
Furthermore,
Further,
Further,
Further,
Further, when the downlink control information for scheduling the downlink shared channel does not include an instruction of the feedback timing,
Further,
Transmission
Transmission
Received
The received
The
For example, the
< hardware Structure >
The block diagram used in the description of the present embodiment represents a block in a functional unit. These functional blocks (structural units) are implemented by any combination of hardware and/or software. The method of implementing each functional block is not particularly limited. That is, each functional block may be implemented by 1 apparatus which is physically and/or logically combined, or by a plurality of apparatuses which are directly and/or indirectly (for example, by wired and/or wireless) connected to two or more apparatuses which are physically and/or logically separated.
For example, the radio base station, the user terminal, and the like in the present embodiment may function as a computer that performs the processing of each embodiment. Fig. 11 is a diagram showing an example of the hardware configuration of the radio base station and the user terminal according to the present embodiment. The
In the following description, the term "device" may be replaced with circuits, devices, units, and the like. The hardware configuration of the
For example, only 1
Each function of the
The
Further, the
The
The
The
The
Further, the
The
(modification example)
In addition, terms described in the specification and/or terms necessary for understanding the specification may be replaced with terms having the same or similar meanings. For example, the channels and/or symbols may also be signals (signaling). Further, the signal may also be a message. The reference signal can also be referred to simply as rs (reference signal) and, depending on the applied standard, may also be referred to as Pilot (Pilot), Pilot signal, etc. Further, a Component Carrier (CC) may also be referred to as a cell, a frequency Carrier, a Carrier frequency, and the like.
The radio frame may be configured of 1 or more periods (frames) in the time domain. The 1 or more periods (frames) constituting the radio frame may also be referred to as subframes. Further, the subframe may be formed of 1 or more slots in the time domain. The subframe may be a fixed duration (e.g., 1ms) that is not dependent on a parameter set (Numerology).
Further, the slot may be formed of 1 or more symbols (OFDM (orthogonal frequency Division Multiplexing) symbols, SC-FDMA (Single carrier frequency Division Multiple Access) symbols, or the like) in the time domain. Also, the slot may be a time unit based on a parameter set (Numerology). Further, a slot may contain multiple mini-slots (mini-slots). Each mini-slot may be composed of 1 or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot.
The radio frame, subframe, slot, mini-slot, and symbol all represent a unit of time when a signal is transmitted. The radio frame, subframe, slot, mini-slot, and symbol may also use other designations corresponding to each. For example, 1 subframe may also be referred to as a Transmission Time Interval (TTI), a plurality of consecutive subframes may also be referred to as TTIs, and 1 slot or 1 mini-slot may also be referred to as TTIs. That is, the subframe and/or TTI may be a subframe (1ms) in the conventional LTE, may be a period shorter than 1ms (for example, 1 to 13 symbols), or may be a period longer than 1 ms. The unit indicating TTI may be referred to as a slot, a mini slot, or the like instead of a subframe.
Here, the TTI refers to, for example, the minimum time unit of scheduling in wireless communication. For example, in the LTE system, the radio base station performs scheduling for allocating radio resources (such as a frequency bandwidth and transmission power usable by each user terminal) to each user terminal in units of TTIs. In addition, the definition of TTI is not limited thereto.
The TTI may be a transmission time unit of a channel-coded data packet (transport block), code block, and/or code word, or may be a processing unit such as scheduling or link adaptation. In addition, when a TTI is given, the time interval (e.g., the number of symbols) in which transport blocks, code blocks, and/or codewords are actually mapped may be shorter than the TTI.
When 1 slot or 1 mini-slot is referred to as TTI, 1 or more TTI (i.e., 1 or more slot or 1 or more mini-slot) may be the minimum time unit for scheduling. Further, the number of slots (mini-slot number) constituting the minimum time unit of the schedule may be controlled.
A TTI having a duration of 1ms may also be referred to as a normal TTI (TTI in LTE rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, or the like. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, or the like.
In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be replaced with a TTI having a time length exceeding 1ms, and a short TTI (e.g., a shortened TTI, etc.) may be replaced with a TTI having a TTI length smaller than that of the long TTI and equal to or longer than 1 ms.
A Resource Block (RB) is a Resource allocation unit in the time domain and the frequency domain, and may include 1 or more consecutive subcarriers (subcarriers) in the frequency domain. In addition, an RB may include 1 or more symbols in the time domain, and may have a length of 1 slot, 1 mini-slot, 1 subframe, or 1 TTI. Each of the 1 TTI and 1 subframe may be formed of 1 or more resource blocks. In addition, 1 or more RBs may also be referred to as Physical Resource Blocks (PRBs), Sub-Carrier groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB peers, and so on.
In addition, a Resource block may be composed of 1 or more Resource Elements (REs). For example, 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.
The above-described structures of radio frames, subframes, slots, mini slots, symbols, and the like are merely examples. For example, the structure of the number of subframes included in the radio frame, the number of slots per subframe or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the Cyclic Prefix (CP) length, and the like can be variously modified.
The information, parameters, and the like described in the present specification may be expressed by absolute values, relative values to predetermined values, or other corresponding information. For example, the radio resource may be indicated by a predetermined index.
The names used for the parameters and the like in the present specification are not limitative names in any point. For example, various channels (PUCCH (Physical Uplink Control Channel), PDCCH (Physical Downlink Control Channel), and the like) and information elements can be identified by all appropriate names, and thus various names assigned to these various channels and information elements are not limitative names in any point.
Information, signals, and the like described in this specification can be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any combination thereof.
Further, information, signals, etc. may be output from a higher layer to a lower layer and/or from a lower layer to a higher layer. Information, signals, and the like may be input and output via a plurality of network nodes.
The information, signals, and the like to be input and output may be stored in a specific area (for example, a memory) or may be managed by a management table. Information, signals, and the like to be input and output may be overwritten, updated, or added. The information, signals, etc. that are output may also be deleted. The input information, signal, and the like may be transmitted to other devices.
The information notification is not limited to the embodiment described in the present specification and the present embodiment, and may be performed by other methods. For example, the notification of the Information may be implemented by physical layer signaling (e.g., Downlink Control Information (DCI)), Uplink Control Information (UCI)), higher layer signaling (e.g., RRC (Radio Resource Control) signaling, broadcast Information (Master Information Block), System Information Block (SIB: System Information Block), etc.), MAC (Medium Access Control) signaling), other signals, or a combination thereof.
In addition, physical Layer signaling may also be referred to as L1/L2(Layer1/Layer 2) control information (L1/L2 control signal), L1 control information (L1 control signal), and the like. The RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like. Further, the MAC signaling may be notified using, for example, a MAC control element (MAC ce (control element)).
Note that the notification of the predetermined information (for example, the notification of "X") is not limited to the explicit notification, and may be performed implicitly (for example, by not notifying the predetermined information or by notifying other information).
The determination may be performed by a value (0 or 1) represented by 1 bit, a true-false value (Boolean) represented by true (true) or false (false), or a comparison of numerical values (for example, a comparison with a predetermined value).
Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, is intended to be broadly interpreted as representing instructions, instruction sets, code segments, program code, programs, subroutines, software modules, applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.
Further, software, instructions, information, etc. may be transmitted or received via a transmission medium. For example, where the software is transmitted from a website, server, or other remote source using wired and/or wireless techniques (e.g., coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and/or wireless techniques (e.g., infrared, microwave, etc.), such wired and/or wireless techniques are included in the definition of transmission medium.
The terms "system" and "network" as used in this specification are used interchangeably.
In the present specification, terms such as "Base Station (BS)", "radio Base Station", "eNB", "gNB", "cell", "sector", "cell group", "carrier", and "component carrier" are used interchangeably. A base station may also be referred to by terms such as a fixed station (fixed station), NodeB, eNodeB (eNB), access point (access point), transmission point, reception point, femto cell, and small cell.
A base station can accommodate 1 or more (e.g., three) cells (also referred to as sectors). In the case where a base station accommodates a plurality of cells, the coverage area of the base station as a whole can be divided into a plurality of smaller areas, and each smaller area can also provide communication services through a base station subsystem (e.g., a small Radio Head (RRH) for indoor use). The term "cell" or "sector" refers to a portion or all of the coverage area of a base station and/or base station subsystem that is in communication service within the coverage area.
In this specification, terms such as "Mobile Station (MS)", "User terminal (User terminal)", "User Equipment (UE)", and "terminal" are used interchangeably.
A mobile station is also sometimes referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless communications device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, or some other suitable terminology.
In addition, the radio base station in this specification may be replaced with a user terminal. For example, the present embodiment and the aspects of the present disclosure can be applied to a configuration in which communication between a radio base station and a user terminal is replaced with communication between a plurality of user terminals (Device-to-Device (D2D)). In this case, the
Similarly, the user terminal in this specification may be replaced with a radio base station. In this case, the
In this specification, an operation performed by a base station is sometimes performed by its upper node (uplink) according to circumstances. In a network including 1 or more network nodes (network nodes) having a base station, it is obvious that various operations performed for communication with a terminal may be performed by the base station, 1 or more network nodes other than the base station (for example, a Mobility Management Entity (MME), a Serving-Gateway (S-GW), or the like is considered, but not limited thereto), or a combination thereof.
The respective modes and embodiments described in the present specification may be used alone, may be used in combination, or may be switched and used in association with execution. Note that, the order of the processing procedures, sequences, flowcharts, and the like in the embodiments and the present embodiment described in the present specification may be changed as long as they are not contradictory. For example, elements of the method described in the present specification are presented in the order of illustration, and are not limited to the specific order presented.
The embodiments described in this specification may be applied to LTE (Long Term Evolution), LTE-a (LTE-Advanced), LTE-B (LTE-Beyond), SUPER3G, IMT-Advanced, 4G (4 generation Mobile communication System, 4th generation Mobile communication System), 5G (5th generation Mobile communication System ), FRA (Future Radio Access), New-RAT (Radio Access Technology, Radio Access Technology), NR (New Radio), NX (New Radio Access), FX (Future Radio Access), GSM (registered trademark) (Global System for Mobile communication), Radio Access System 802, Radio Access System, IEEE 802.16(WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), a system using other appropriate wireless communication method, and/or a next generation system expanded based thereon.
As used in this specification, a statement that "is based on" does not mean "is based only on" unless explicitly stated otherwise. In other words, the expression "based on" means both "based only on" and "based at least on".
Any reference to the use of the terms "first," "second," etc. in this specification is not intended to limit the amount or order of those elements in a comprehensive manner. These designations may be used herein as a convenient means of distinguishing between two or more elements. Thus, reference to first and second elements does not mean that only two elements may be employed or that the first element must precede the second element in some fashion.
The term "determining" used in the present specification may include various operations. For example, "determining" may be considered "determining" a calculation (computing), a processing (processing), a derivation (deriving), a survey (visualizing), a search (logging) (e.g., a search in a table, database, or other data structure), a confirmation (intercepting), and the like. Further, "determining" may be considered as "determining" reception (e.g., receiving information), transmission (e.g., transmitting information), input (input), output (output), access (e.g., accessing data in a memory), and the like. Further, "judgment (decision)" may be regarded as "judgment (decision)" performed on solution (resolving), selection (selecting), selection (breathing), establishment (evaluating), comparison (comparing), and the like. That is, "judgment (decision)" may be regarded as "judgment (decision)" performed on some operation.
The terms "connected", "coupled" or all variations thereof used in the present specification mean all connections or couplings between two or more elements directly or indirectly, and can include a case where 1 or more intermediate elements are present between two elements "connected" or "coupled" to each other. The combination or connection between the elements may be physical, logical, or a combination thereof. For example, "connected" may also be replaced with "accessed".
In the case of connecting two elements in this specification, it can be considered that the two elements are "connected" or "combined" with each other by using one or more wires, cables and/or printed electrical connections, and by using electromagnetic energy having a wavelength of a wireless frequency domain, a microwave region and/or a light (both visible and invisible) region, or the like, as several non-limiting and non-exhaustive examples.
In the present specification, the term "a is different from B" may mean "a and B are different from each other". The terms "isolated", "associated", and the like are also to be construed in a similar manner.
In the case where the terms "including", "containing" and "comprising" are used in the present specification or claims, these terms are intended to be inclusive in the same manner as the term "comprising". Further, the term "or" as used in the present specification or claims means not a logical exclusive or.
The present invention has been described in detail above, but it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in the present specification. The present invention can be implemented as modifications and variations without departing from the spirit and scope of the present invention defined by the claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.
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