阅读说明：本技术 用于预留传输资源的收发器和方法 (Transceiver and method for reserving transmission resources ) 是由 托马斯·费伦巴赫 巴里斯·高克特佩 科内留斯·赫尔奇 托马斯·沃思 托马斯·斯切尔 萨伦· 于 2020-03-31 设计创作，主要内容包括：一种收发器被配置用于在无线通信网络中进行通信,该收发器被操作以便在多个传输时间间隔中调度通信,每个传输时间间隔包括布置在时频网格中的多个资源元素。每个传输时间间隔包括控制段和数据段。收发器被配置用于使用控制段中的资源进行发送,控制段中的资源包含预留信息,该预留信息指示收发器在未来传输时间间隔中预留特定资源。(A transceiver configured for communication in a wireless communication network, the transceiver being operative to schedule communications in a plurality of transmission time intervals, each transmission time interval comprising a plurality of resource elements arranged in a time-frequency grid. Each transmission time interval includes a control segment and a data segment. The transceiver is configured to transmit using resources in the control segment, the resources in the control segment containing reservation information that instructs the transceiver to reserve certain resources in future transmission time intervals.)

1. a transceiver configured for communication in a wireless communication network, the transceiver being operative to schedule communications in a plurality of transmission time intervals, each transmission time interval comprising a plurality of resource elements arranged in a time-frequency grid; each transmission time interval comprises a control segment PSCCH and a data segment PSSCH;

wherein the transceiver is configured to transmit using resources in the control segment, the resources in the control segment containing reservation information indicating that the transceiver reserves specific resources in future transmission time intervals.

2. The transceiver of claim 1, wherein the transceiver is configured to use resources for transmitting the reservation information as resources of a first subset of resources of the control segment, the reservation information indicating that the transceiver reserved the particular resources in the future transmission time interval; and

wherein the transmitter is configured to transmit in the same or different transmission time intervals and by using a second subset of resources of the control segment that is different from the first subset, the second subset containing information associated with a data segment of the transmission time interval; or a data segment of a future transmission time interval.

3. The transceiver of claim 2, wherein the transceiver is adapted to use the first subset of control resources as non-transceiver specific and the second subset as transceiver specific.

4. The transceiver according to claim 2 or 3, wherein a control subset is at least partially multiplexed in a frequency division multiplexing, FDM, scheme, wherein the first subset is associated with a first number of resource subchannels; wherein the second subset is associated with a second number of resources.

5. The transceiver of one of the preceding claims, wherein a resource is at least one of the following

A set of resource elements is provided that is,

the number of resource blocks,

a set of resource blocks forming a sub-channel,

a set of subchannels.

6. The transceiver of claim 4 or 5, wherein the first number of resources is one and the first number of resources is the first resources of the control segment in a frequency range.

7. The transceiver of any of claims 2 to 6, wherein the control subset is multiplexed at least in part in a Time Division Multiplexing (TDM) scheme, wherein the first subset is associated with a first number of symbols; wherein the second subset is associated with a second number of symbols.

8. The transceiver of any one of claims 2 to 7, wherein the control subset is multiplexed at least in part in a Spatial Division Multiplexing (SDM) scheme, wherein the first subset is associated with a first number of beams; wherein the second subset is associated with a second number of beams.

9. The transceiver of one of claims 2 to 8, wherein the amount of resources of the first subset of control segments is smaller when compared to the amount of resources of the second subset.

10. The transceiver of one of claims 2 to 9, wherein the second subset comprises information allowing decoding of data received in the transmission time interval.

11. The transceiver of one of claims 2 to 10, wherein the first subset is configured by the transceiver for transmitting the reservation information for indicating time and frequency information of the future transmission time interval, the future transmission time interval containing the controlled second subset and corresponding data.

12. The transceiver of claim 11, wherein the transceiver is configured to transmit the reservation information so as to point to a second portion of the control segment of a future transmission time interval, which in turn points to a data element of a data segment of the future transmission time interval.

13. The transceiver of one of claims 2 to 12, wherein the reservation information explicitly points to a specific resource of the future transmission time interval or implicitly points to the data segment of the future transmission time interval that points to the specific resource.

14. The transceiver of one of the preceding claims, wherein the transceiver is configured to reserve the same specific resource in the future transmission time interval by transmitting the reservation information in at least a first and a second transmission time interval.

15. The transceiver according to one of the preceding claims, wherein the specific resource is a first specific resource, wherein the transceiver is configured to transmit the reservation information for instructing the transceiver to reserve the first specific resource and at least a second specific resource in a same future transmission time interval; and/or to instruct the transceiver to reserve at least a second specific resource in a different future transmission time interval.

16. The transceiver of one of the preceding claims, wherein the future transmission time interval is a first future transmission time interval, wherein the reservation information is first reservation information, wherein the transceiver is configured to transmit data in the first future transmission time interval using the reserved specific resources, wherein the transceiver is configured to include second reservation information into a control segment of the first future transmission time interval in order to reserve resources in a different second future transmission time interval for retransmitting the data.

17. The transceiver of one of the preceding claims, wherein the specific resource is a first specific resource, wherein the future transmission time interval is a first future transmission time interval, wherein the transceiver is configured to transmit the reservation information to indicate that the first specific resource and a second specific resource in a different second future transmission time interval are reserved for retransmitting the data.

18. The transceiver of claim 16 or 17, wherein the transceiver is configured for retransmitting the data, for transmitting one of: an exact copy, a redundancy version of the exact copy, additional data, or data different from the transmission in the first future transmission time interval.

19. The transceiver of one of the preceding claims, wherein the future transmission time interval is a first future transmission time interval, wherein the transceiver is configured for scheduling data transmissions in a plurality of future transmission time intervals comprising the first future transmission time interval; wherein the transceiver is configured to include the reservation information in a control segment of a time frame to indicate a plurality of reservations for particular resources in the plurality of future transmission time intervals; and retransmitting the reservation information related to the remaining transmission time intervals in each future transmission time interval.

20. The transceiver of claim 19, wherein the transceiver is configured to reserve corresponding specific resources in the plurality of future transmission time intervals and to use a counter indicating a number of remaining future transmission time intervals in which the specific resources are reserved.

21. The transceiver of one of the preceding claims, wherein the transceiver is configured to select the future transmission time interval so as to occupy the same frequency band when compared to the transmission time interval.

22. The transceiver of one of the preceding claims, wherein the transceiver is configured to select the future transmission time interval to occupy at least one resource on the same frequency when compared to the transmission time interval.

23. The transceiver of one of the preceding claims, wherein the transceiver is configured to select the future transmission time interval to occupy a different frequency band when compared to the transmission time interval.

24. The transceiver of one of the preceding claims, wherein the transceiver is configured to select the future transmission time interval to occupy at least one resource on a different frequency when compared to the transmission time interval.

25. The transceiver of claim 34 or 24, wherein the transmission time interval is implemented using a first frequency; wherein the transceiver is configured to select the future transmission time interval such that a second different frequency of the future transmission time interval conforms to a predetermined frequency pattern that can be at least stored in a memory of the transceiver or preconfigured by the network and informed to the transceiver, including validity of the pattern over a certain period of time.

26. The transceiver of claim 25, wherein the transceiver is configured to reserve resources in a plurality of future transmission time intervals and to select a plurality of future time frames according to the predetermined frequency pattern.

27. The transceiver of claim 25 or 26, wherein the transceiver has stored a plurality of frequency modes, the transceiver being configured to select one of the plurality of frequency modes based on monitored data traffic and/or based on received control signals.

28. The transceiver of one of the preceding claims, wherein the transceiver is configured to reserve the specific resource and at least one further specific resource for the same transmission; wherein, in the future transmission time interval, the transceiver is configured to perform collision avoidance by using one of the specific resource and the further specific resource determined by the transceiver to be available without collision.

29. The transceiver of claim 28, wherein the transceiver is configured to perform listen-before-talk for collision avoidance.

30. The transceiver of claim 28 or 29, wherein the transceiver is configured to use a random backoff counter to delay transmissions using the particular resource or the further particular resource.

31. The transceiver of one of claims 28 to 30, wherein the transceiver is configured to select the further specific resource in a different frequency than the specific resource.

32. The transceiver of one of the preceding claims, wherein the transceiver is a first transceiver and is configured for: the reservation information of the second transceiver is received and its own scheduled transmission is abandoned in the indicated specific resource.

33. The transceiver of claim 32, wherein the first transceiver is configured to: evaluating a control segment of the time frame; detecting reservation information from the second transceiver; and in response to the reservation information, relinquishing its own scheduled transmission in the indicated specific resource.

34. The transceiver of claim 32 or 33, wherein the transceiver is configured to: evaluating a priority of the indicated transmission associated with the reservation information; comparing the indicated priority with an internal priority of the scheduled transmission; determining that the comparison result indicates that the indicated priority is lower than or equal to its own priority; and not abandoning the scheduled transmission based on the comparison result.

35. A transceiver configured for communication in a wireless communication network, the transceiver being operative to schedule communications in a plurality of transmission time intervals, each transmission time interval comprising a plurality of resource elements arranged in a time-frequency grid; each transmission time interval comprises a control segment PSCCH and a data segment PSSCH;

wherein the user equipment is configured to transmit information using the control channel, the information indicating that the transceiver reserves specific resources in a future transmission time interval.

36. The transceiver of one of the preceding claims, wherein the transmission time interval is implemented to occupy a plurality of subcarriers or resource blocks in a time interval, wherein the control segment is transmitted at the beginning of the transmission time interval over the duration of a subset of a plurality of subcarriers or resource blocks and a first time sub-interval, wherein the data segment is transmitted in the first time sub-interval in the remaining subcarriers or resource blocks and after the first time sub-interval in the plurality of subcarriers or resource blocks.

37. The transceiver according to one of the preceding claims, wherein the plurality of resource elements arranged in the time-frequency grid are arranged along groups of subcarriers, wherein each group of subcarriers forms a transmission time interval element occupying a frequency band of the plurality of subcarriers.

38. The transceiver of one of the preceding claims, wherein the transmission time interval is arranged within one time slot.

39. The transceiver of one of the preceding claims, comprising one or more of the following

-a user equipment;

-a mobile or a fixed base station,

-a mobile terminal for receiving a request from a user,

-a fixed terminal for receiving a signal from a mobile terminal,

-a cellular IoT-UE,

-a vehicle-mounted UE,

-a group head UE GL,

-an IoT or narrowband IoT NB-IoT device,

-a ground-based vehicle,

-an aircraft,

-a drone,

-a mobile base station for transmitting a mobile radio signal,

-a Road Side Unit (RSU),

-a building, and

any other item or device, e.g. a sensor or an actuator, with a network connection enabling the item/device to communicate using the wireless communication network.

40. The transceiver of any preceding claim, comprising a base station, wherein the base station comprises one or more of the following

-a macro cell base station,

-a small cell base station,

-a central unit of the base station,

-a distributed unit of base stations,

-a road-side unit for the road-side unit,

-UE，

-a cluster head GL of the cluster head,

-a relay of the data stream to be relayed,

-a remote radio head, the remote radio head,

-AMF，

-SMF，

-a core network entity for providing a core network entity,

-a mobile edge computing entity,

network slicing as in the NR or 5G core context, and

-any transmission/reception point TRP enabling an item or device to communicate using the wireless communication network, the item or device being provided with a network connection to communicate using the wireless communication network.

41. A transceiver configured for communication in a wireless communication network, the transceiver being operative to schedule communications in a plurality of transmission time intervals, each transmission time interval comprising a plurality of resource elements arranged in a time-frequency grid; each transmission time interval comprises a control segment PSCCH and a data segment PSSCH;

wherein the transceiver is a first transceiver and is configured to receive a signal from a second transceiver using a transmission time interval, the signal containing reservation information in the control segment indicating that the second transceiver reserved a particular resource in a future transmission time interval;

wherein the transceiver is configured to relinquish its own scheduled transmission in the indicated particular resource.

42. A wireless network, comprising:

at least one transceiver according to one of claims 1 to 41; and

the at least one transceiver of claim 41.

43. The wireless communication system of claim 42, wherein communications are scheduled in a sidelink of the system, the sidelink using a set of sidelink resources defining one or more of:

the resource pool RP is a pool of resources,

the pool of mini-resources mRP is,

the bandwidth part BWP in the resource pool,

resource pools in BWP.

44. A method for operating a transceiver configured for communication in a wireless communication network, the transceiver being operated so as to schedule communications in a plurality of transmission time intervals, each transmission time interval comprising a plurality of resource elements arranged in a time-frequency grid; each transmission time interval comprises a control segment PSCCH and a data segment PSSCH; the method comprises the following steps:

transmitting using resources in the control segment, the resources in the control segment including reservation information indicating that particular resources are reserved in future transmission time intervals.

45. A method for operating a transceiver configured for communication in a wireless communication network, the transceiver being operated so as to schedule communications in a plurality of transmission time intervals, each transmission time interval comprising a plurality of resource elements arranged in a time-frequency grid; each transmission time interval comprises a control segment PSCCH and a data segment PSSCH; wherein the transceiver is a first transceiver, the method comprising:

receiving a signal from a second transceiver using a transmission time interval, the signal including reservation information in the control segment indicating that the second transceiver reserved a particular resource in a future transmission time interval;

relinquishing its own scheduled transmission in the indicated particular resource.

46. A computer-readable digital storage medium having stored thereon a computer program having a program code for performing, when running on a computer, the method according to claim 44 or 45.

Technical Field

The invention relates to a transceiver and a method of operating the same. The present application relates in particular to the field of wireless communication systems or networks, such as New Radios (NR), and more particularly to a method for wireless communication between user equipments of a wireless communication system using sidelink communication, such as a vehicle-to-everything (V2X) preemption procedure, and to reserving resources in future time transmission intervals. Embodiments relate to improvements in communication on side links, for example, in particular to improvements in resource allocation for NR V2X.

Background

The original vehicle-to-everything (V2X) specification is included in LTE release 14 of the 3GPP standard. The scheduling and allocation of resources has been modified according to the V2X requirements, while the standard original device-to-device (D2D) communication part has been used as a basis for design.

In LTE V2X, the vehicle sends messages in one of two ways — periodically over a period of time, called a semi-persistent scheduling (SPS) transmission, or only once at a single instance, called a single-shot (OS) transmission. For each of these transmissions, there is a ProSe Per Packet Priority (PPPP) and ProSe Per Packet Reliability (PPPR) indicator attached to each broadcast packet that indicates the priority and reliability level required for that packet from a given application.

Release 15 of the LTE V2X standard (also known as enhanced V2X or eV2X) was completed in 2018, month 6. The 3GPP includes the first release of NR V2X in NR release 16. NR V2X has identified a set of use cases to implement, and one important area of these use cases is to guarantee a certain quality of service (QoS) for a given application service. The concept of reserving resources for high priority transmissions in particular is an important part of the resource allocation mechanism in NR and in particular in NR V2X. In this context, preemption of a resource defines the act of temporarily interrupting the use of the resource to allow higher QoS data traffic to use the resource without requiring cooperation. A user who preempts its resource aims to resume its task by deferring to another resource element.

The problems faced in preemptively reserving resources for high priority transmission include the aspect of control signaling required for preemption, the location of control signaling in the time-frequency grid, and the conflict resolution for UEs to preempt the same resources.

In the release 16 research project phase in NR V2X, it has been confirmed that the Sidelink Control Information (SCI) can be split into two parts or phases, where the first part can be read by all UEs (user equipments) and directed to the second part, which is only read by the intended recipient UE and directed to the data.

There is a need for reliable communication, especially for high priority transmissions.

Disclosure of Invention

It is therefore an object of the present invention to provide reliable communication.

This object is achieved by the subject matter defined in the independent claims. In particular, the present application drafts a solution for an efficient mechanism for reserving resources in future transmission time intervals in order to provide highly reliable communication.

According to one embodiment of the application, a transceiver configured for communication in a wireless communication network is operative to schedule communications in a plurality of transmission time intervals, each transmission time interval comprising a plurality of resource elements arranged in a time-frequency grid.

Each transmission time interval includes a control segment (e.g., a physical side link control channel (PSCCH)) and a data segment (e.g., a physical side link shared channel (PSCCH)). The transceiver is configured to transmit using resources in the control segment, the resources in the control segment containing reservation information that instructs the transceiver to reserve certain resources in future time slots. This allows announcing the need for future transmissions, thereby enabling reliable communication.

According to an embodiment, a transceiver configured for communication in a wireless communication network is operated for scheduling communications in a plurality of transmission time intervals, each transmission time interval comprising a plurality of resource elements arranged in a time-frequency grid. Each transmission time interval includes a control segment and a data segment. The transceiver is configured to receive a signal using a transmission time interval from another, different transceiver, the signal containing reservation information in the control segment indicating that the other transceiver reserved the specific resource in a future transmission time interval. The receiving transceiver is configured to abandon, i.e. cancel or defer, its scheduled transmission in the indicated specific resource.

Further embodiments relate to a wireless network, a method for operating the transceiver, and a computer-readable digital storage medium.

Further embodiments are defined in the dependent claims.

Drawings

Embodiments of the invention will now be described in further detail with reference to the accompanying drawings, in which:

FIG. 1 shows a schematic diagram of different configuration options of transmission time intervals addressed by embodiments of the present invention;

fig. 2a shows a schematic diagram of two subsequent transmission time intervals, wherein the transmission time intervals are in accordance with an embodiment;

fig. 2b shows different possible implementations of transmission time intervals according to embodiments;

fig. 3 shows a schematic block diagram of a transceiver according to an embodiment;

fig. 4 shows a schematic diagram illustrating the time and frequency locations for announcing future transmission time intervals to other UEs for reservation purposes, according to an embodiment;

fig. 5 shows a schematic block diagram of implementing four transmission time intervals in an FDM scheme in accordance with an embodiment;

FIG. 6 illustrates an example of a TDM scheme implemented in a control region, according to an embodiment;

fig. 7 shows a schematic diagram illustrating a combination of FDM and TDM in accordance with an embodiment;

fig. 8a to 8g show schematic diagrams illustrating the concept of reserving resources according to an embodiment;

fig. 9 shows a schematic diagram of a general example of how a user equipment may preempt its data for high priority transmission of another UE, according to an embodiment;

fig. 10 shows a schematic diagram of an implementation in which control segments of different transmission time intervals are used to signal reservation information pointing to the same future transmission time interval;

fig. 11 shows a schematic diagram of a plurality of transmission time intervals arranged on an exemplary number of three sub-channels, in accordance with an embodiment; and

fig. 12 shows a schematic block diagram of a wireless communication network according to an embodiment.

Detailed Description

In the following description, the same or equivalent elements or elements having the same or equivalent functions are denoted by the same or equivalent reference numerals even though they appear in different drawings.

In the following description, numerous details are set forth to provide a more thorough explanation of embodiments of the present invention. It will be apparent, however, to one skilled in the art that embodiments of the invention may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form, rather than in detail, in order to avoid obscuring embodiments of the present invention. Furthermore, the features of the different embodiments described below may be combined with each other, unless specifically indicated otherwise.

The embodiments described below relate to wireless transmission of signals while utilizing resources arranged in a time-frequency grid. The granularity of such a time-frequency grid may be understood as grouping resource elements into groups of resource elements, i.e. resource blocks, wherein a group of resource blocks may form a sub-channel, which may be grouped into a group of sub-channels. A resource element may be a subcarrier that may be used to transmit one or more symbols. The sub-channels may include a plurality of Resource Blocks (RBs). Different subcarriers may also be mapped to different antennas, allowing for spatial multiplexing as in multiple-input multiple-output (MIMO) or single-input multiple-output (SIMO) or multiple-input single-output (MISO) systems, which is also referred to as mapping to the spatial domain. Furthermore, the subcarriers may be precoded and thus beamformed to certain spatial directions.

Although embodiments refer to Transmission Time Intervals (TTIs), embodiments are not so limited. TTI may also be understood as a time slot of communication such that those descriptions may be interchanged without limitation. The transmission time interval is usually abbreviated as TTI, and one TTI duration corresponds to the number of consecutive symbols transmitted at a time in the time domain TS38.8045.4.7]. A parameter set mu (e.g., mu e {0,1,2,3,4} where the subcarrier spacing (SCS) is 2^μ15kHz) and one TTI duration determines the exact length of the transmission on the physical layer. Note that a frame or radio frame in NR is generally composed of 10 subframes, each of which is 1 ms. Each subframe is divided into slots, each slot carrying 14 symbols, e.g., OFDM symbols or SC-FDMA symbols. The number of slots in a subframe depends on the parameter set μ. Note that subcarriers and subcarriers are used as synonyms.

In general, the wireless communication system referred to in any of the embodiments may be any single-tone or multi-carrier system using frequency division multiplexing, such as an Orthogonal Frequency Division Multiplexing (OFDM) system, an Orthogonal Frequency Division Multiple Access (OFDMA) system, or any other IFFT-based signal with or without a CP, such as DFT-s-OFDM. Other waveforms may be used such as non-orthogonal waveforms for multiple access, e.g., filter bank multi-carrier (FBMC), Generalized Frequency Division Multiplexing (GFDM), or general filtering multi-carrier (UFMC). The wireless communication system may operate, for example, in accordance with any of the LTE standards (LTE, LTE-A, LTE-a Pro, LTE evo) or 5G or NR new radio standards.

Embodiments described herein may relate to a transceiver and may be specifically explained in connection with a User Equipment (UE). Embodiments are not limited to UEs, but relate to, but are not limited to, other types of transmitters or transceivers, e.g., transceivers comprising at least one of the following

-a user equipment;

-a mobile or a fixed base station,

-a mobile terminal for receiving a request from a user,

-a fixed terminal for receiving a signal from a mobile terminal,

-a cellular IoT-UE,

-a vehicle-mounted UE,

-a head of group UE (GL),

-an IoT or narrowband IoT "NB-IoT" device,

-a ground-based vehicle,

-an aircraft,

-a drone,

-a mobile base station for transmitting a mobile radio signal,

-a Road Side Unit (RSU),

-a building, and

any other item or device, e.g. a sensor or actuator, provided with a network connection enabling the item/device to communicate using a wireless communication network.

For example, a mobile or fixed base station may include one or more of the following:

-a macro cell base station,

-a small cell base station,

-a central unit of the base station,

-a distributed unit of base stations,

-a road-side unit for the road-side unit,

-UE，

-a cluster head (GL),

-a relay of the data stream to be relayed,

-a remote radio head, the remote radio head,

-AMF，

-SMF，

-a core network entity for providing a core network entity,

-a mobile edge computing entity,

network slicing as in the NR or 5G core context, and

-any transmission/reception point TRP enabling an item or device to communicate using a wireless communication network, the item or device being provided with a network connection to communicate using the wireless communication network.

Fig. 1 is a schematic diagram of different options 1A, 1B, 2 and 3 of a transmission time interval 12 addressed by embodiments of the present invention. The transmission time interval may be used to transmit information, which is, for example, grouped into a control segment 14, such as a physical side link control channel (PSCCH), and a data segment, such as a physical side link shared channel (PSCCH). According to an embodiment, the transmission time interval is implemented to occupy a plurality of subcarriers or resource blocks in a time interval, wherein the control segment 14 is transmitted at the beginning of the transmission time interval over the duration of a subset of the plurality of subcarriers or resource blocks and a first time sub-interval. The data segment 16 may be transmitted in a first time sub-interval in the remaining subcarriers or resource blocks and after the first time sub-interval in the plurality of subcarriers or resource blocks.

As shown in option 1A, the control segment may occupy the entire frequency range, i.e., all subcarriers, for a period of time. Alternatively, the control segment 14 may occupy only a portion of the subcarriers, as shown in option 1B. Alternatively, the control segment may occupy a portion of the frequency range or spectrum, i.e. some subcarriers, for the entire duration of the transmission time interval, as shown in option 2. The data segments 16 may form the associated and/or linked part of the transmission time interval 12 as shown in options 1A, 1B and 2. Alternatively or in addition to being associated with data segments of the same transmission time interval, the control segment may be associated with a future transmission time interval. Occupying a frequency or frequency band may be understood as using a corresponding frequency (frequency band) for transmission.

The embodiments described herein will refer to option 3, which is not limiting the scope of the invention but is selected for explanatory reasons. The control segment 14 comprises a subset of subcarriers for a portion of the duration of the transmission time interval 12. During the time of the control segment 14, the subcarriers not used by the control segment 14 are available for the data segment 16.

Fig. 2a shows two subsequent transmission time intervals 12₁And 12₂In which the time interval 12 is transmitted₁May occupy a time slot TS0 in which transmission time interval 12 is transmitted₂Different lengths of time may be occupied, for example time slots TS1 and TS 2. Each transmission time interval may comprise a respective control segment 14 implemented according to option 3 of fig. 1₁And 14₂And corresponding data segment 16₁And 16₂. Transmission time interval 12₁And 12₂Four resource blocks RB may be occupied in the frequency range, e.g. RB0, RB1, RB2 and RB3, which are commonForming a sub-channel SC.

According to fig. 2b, a different possible implementation of a transmission time interval is shown, wherein the transmission time interval 12 occupies a total of ten time slots, wherein the control segment 14 is not limited to a part of the time slots as shown in fig. 2a, but occupies more than one time slot, e.g. two time slots TS0 and TS 1. Alternatively or additionally, the control segment 14 may occupy one full sub-channel or even more, e.g. three sub-channels SC1, SC2 and SC 3. Alternatively, one or more of the sub-channels SC 0-SC 4 may be partially occupied. These five sub-channels may form a resource pool RP, i.e. a mini resource pool and/or a sub-resource pool.

In connection with the embodiments described herein, the transmission time interval may be implemented to occupy a single time slot, which is just an example as described in connection with fig. 1, 2a and 2 b.

Fig. 3 shows a schematic block diagram of a transceiver 30 according to an embodiment the transceiver 30 may comprise an antenna arrangement 18, which antenna arrangement 18 may comprise a single antenna, a cross-polarized antenna, a MIMO antenna comprising several antennas, or an antenna array to perform wireless communication according to the scheme described herein. Optionally, the transceiver 30 may be configured to perform beamforming using the antenna arrangement 18. The transceiver 30 may be a mobile device, such as a smart phone, laptop, automobile, manned or Unmanned Aerial Vehicle (UAV), internet of things (IoT) device, etc., but may also be a fixed device, such as a building, drive test unit RSU, fixed IoT device, etc. The embodiments are not limited thereto. For example, the transceiver 30 may also be a satellite or the like.

The transceiver 30 is configured for communication in a wireless communication network, the transceiver 30 being operative to schedule communications in a plurality of transmission time intervals. Each transmission time interval may comprise a plurality of resource elements arranged in a time-frequency grid, as described in connection with fig. 1, 2a and 2 b. Each transmission time interval may include a control segment 14 and a data segment 16. The transceiver 30 is configured to transmit reservation information using the resources in the control segment 14, the reservation information instructing the transceiver to reserve certain resources in future time slots. The particular resources reserved may be resources of the data segment 16. Such reservation can be made explicitly by directly indicating the resources. Alternatively, the reservation information may point to a control segment of a future transmission time interval, which then points to a specific resource of the transmission time interval. Thus, implicit reservation information may be sent.

For example, the network may provide sidelink communications, i.e., communications may be scheduled in a sidelink of the system. Side links may provide and/or use a set of side link resources that define one or more of the following:

a pool of Resources (RP),

a pool of mini-resources (mRP),

the bandwidth part BWP with the start frequency, the end frequency and the parameter set in the resource pool, the resource pool in BWP.

According to an embodiment, the transceiver 30 may be configured to: fig. 4 shows three subsequent transmission time intervals 12, fig. 4 using resources for transmitting reservation information indicating that the transceiver reserved a specific resource in a future transmission time interval by using resources of a first subset of resources of the control segment as shown for example in fig. 4₁、12₂And 12₃. The first subset 14a (i) of the control segment 14 may comprise a first portion, subset or part of the resources of the control segment 14, while the second subset 14b may optionally comprise additional or remaining resources. When the subset 14b is available to point to the transmission time interval 12₁Data section 16 of₁So as to be able to decode the data section 16₁The resources of the subset 14a are available for transmission pointing to the future transmission time interval 12₂Is determined by the reservation information(s) 22₁Future transmission time interval 12₂It may optionally be a subsequent transmission time interval, but may also be any other future transmission time interval.

Optionally, the transceiver may be configured to use the transmission time interval 12₂Data section 14 of₂To transmit further reservation information for a further future transmission time interval 12₃To reserve resources. I.e. in the transmission time interval 12₁The subset 14a may be used to transmit reservation information 22₁Which indicates the transceiver in the future time slot 12₂To reserve a specific resource. The transmitter may be configured to transmit in the same transmission time interval as transmission time interval 12 by using the resources of the subset 14b of control segments 14₁Of the data section 16. Alternatively, different transceivers may transmit the respective information in the subset 14 b. The subsets 14a and 14b may comprise different subsets of resources and/or separate subsets. Other embodiments may have a common control segment 14.

The resources of the subset 14a may be transceiver-non-specific and may be evaluated, received and/or decoded by each transceiver that is aware of the corresponding signal. Conversely, the resources of the subset 14b may be transceiver-specific, i.e. only those transceivers decode the data addressed by the respective resource.

In other words, a possible design is two-phase control information signaling, with details about the location of the two phases in the time-frequency grid. Other aspects defined in connection with the present embodiments may relate to a collision resolution scheme to be employed when more than one transceiver (e.g., UE) intends to reserve the same resources for high priority transmissions. Another aspect of the present embodiment is the use of k-phase control information used by the UE/transceiver to transmit with high quality of service (QoS) during transmissions with k repetitions. Here, a UE with a lower QoS will align its resource preemption with the control information decoded from the k-phase control information element to reduce interference to the message and increase the probability that other UEs can decode the k-phase control information.

The control portion may be multiplexed at least partially in a Frequency Division Multiplexing (FDM) scheme, wherein a first subset 14a is associated with a first number of resources and a subset 14b is associated with a second number of resources, wherein each resource may refer to a set of resource elements, a resource block, a set of resource blocks forming a subchannel and/or a set of subchannels. According to an embodiment, the number of resources of the subset 14a may be one. The resource may be the first resource of the control segment in the frequency range, i.e. the resource having the lowest frequency, frequency range or frequency band.

In other words, based on option 3 of fig. 1, which may be selected as a configuration of transmission time interval or frame format, the control region or segment 14 may be divided into two parts, e.g., PSCCH1(14a) and PSCCH2(14b), where PSCCH1 may be read by all UEs and PSCCH2 may be UE-specific. The design may be implemented in FDM, Time Division Multiplexing (TDM), and/or Space Division Multiplexing (SDM), where the concepts may be combined with each other such that portions or subsets of individual data segments may each be multiplexed in an FDM, TDM, and/or SDM scheme.

In implementing FDM control region division, the PSCCH1 may occupy the first sub-channel within the control region in a time slot (and correspondingly in the transmission time interval). In the case where the control region 14 as a whole only occupies a single sub-channel, the PSCCH1 will be transmitted in the first few RBs of the sub-channel. The remainder of the control region 14 will be used for transmission of the PSCCH 2. In a given slot (transmission time interval) 1, the UE1 may use the PSCCH1 to reserve resources in future slots/transmission time intervals by announcing the time and frequency position of the future slot to other UEs. In the same set slot 1, another UE2 may transmit the PSCCH2 linked to the data region 16 in the same slot. This is shown, for example, in fig. 4. It is noted that the data segment 16 may also be empty, so that only the control segment 14 is transmitted. The control region I (i.e., sub-segment 14) may point to the next control data element, e.g., future slot 12₂Control section 14 of₂Wherein the control region II (i.e. the subset 14b) may point to the data and may comprise information required for decoding the data. That is, fig. 4 shows a general definition of two-stage Sidelink Control Information (SCI): two control elements and one data element are implemented in a slot/transmission time interval.

FIG. 5 shows four transmission time intervals 12 in four respective Time Slots (TS)1, TS2, TS3, and TS4₁To 12₄Schematic block diagram of an implementation of (1). E.g. transmission time interval 12₂And 12₄14a of₂And 14a₄May remain unused in this example. In time slot 1, a first transceiver (e.g., UE1) may transmit a beacon data segment 14₃(particularly subset 14b)₃) Is stored in the storage unit 22₁Data section 14₃Itself points to a data segment 16₃Which is then sent by the UE 1. That is, the UE1 utilizes the reservation information 22₁In the data section 16₃And (4) reserving resources. This information is identified by the other transceivers UE2 and UE3, e.g., each of which is implemented as transceiver 30 of fig. 3.

Transmission time interval 12₁14b of₁May be used by a UE2 or UE3 other than the UE1 sending the reservation information, while other UEs may be in transmission time interval 12₃In which their data transfer is aborted or postponed or cancelled.

Fig. 4 and 5 show schematic exemplary illustrations of FDM schemes, and fig. 6 shows an example of TDM control region division. The subset 14a may be associated with a first number of symbols and the subset 14b may be associated with a second, different number of symbols, each subset occupying the entire frequency range of the control segment 14 for a particular time.

In other words, embodiments similar to previous designs (FDM) allow the PSCCH phase to be divided in a TDM fashion, with the PSCCH1 occupying the first few symbols of the control region 14, followed by the PSCCH2 occupying the remainder of the control region 14.

The FDM scheme and TDM scheme may be implemented separately or in combination with each other as shown in fig. 7, in which a combination of FDM and TDM is implemented. Alternatively or additionally, the control subsets may be multiplexed at least in part in a spatial division multiple access (SDM) scheme. This may be achieved, for example, by precoding or other phase shifting means, or by performing analog or digital beamforming and using different beams in different directions or regions. A first subset of the available beams may be associated with subset 14a and a second, different number of beams or subset of beams may be associated with subset 14 b. A beam may be understood as a means for beamforming. The beam may belong to a lobe that points in a particular direction from the transmitter to the receiver. The first beam may have a defined beam whose length may contain a portion of the control, the second beam may have a second portion of the control and/or data, and the third beam may control the data segment.

According to an embodiment, the amount of resources of the subset 14a may be smaller when compared to the amount of resources of the subset 14 b. This may allow maintaining a high throughput of wireless communication. By using the subset 14a, the transceiver can transmit reservation information 22 to indicate time and frequency information for future transmission time intervals, and then contain a second subset 14b of the control segment 14 and corresponding data.

According to an embodiment, a subchannel described herein may comprise a plurality of Resource Blocks (RBs). The entire control region 14 and data region 16 may be multiplexed with the same subchannels. In this case, of the RBs for the control channel, the first few are used for the first part and the rest are used for the second part. For example, if there are 5 RBs in the subchannel, based on option 3 of fig. 1, in a slot containing control and data, the first and last RBs can be used for data, and the middle three for control. Among the three RBs for control, a first RB may be used for the first part (reservation) and second and third RBs may be used for the second part 14 b. Along the frequency, this may look like D (80a), C (control) 1, C2, C3, D.

The reservation information may thus point to the future time slot 12₂、12₃Or a second portion 14b of the control segment 14 of another slot/transmission time interval, which in turn points to the data elements of the data segment 16 of the indicated future slot.

The division of the control section 14 into subsets 14a and 14b is optional. Depending on the embodiment, different or even no partitioning may be used. These embodiments share: the control segment 14 is still used to transmit the reservation information 22.

According to an embodiment, the transceiver may be configured to reserve the same specific resource in a future transmission time interval/slot by transmitting reservation information in at least a first and a second transmission time interval/slot. Fig. 8a shows a control segment 14 at a first transmission time interval₁In order to transmit a preemption message, i.e. reservation information 22, in the future transmission time interval 12₂Whereas fig. 8b shows such a configuration in comparison to fig. 8 a. Whether or not the respective data segments are associated with different transmission time intervals 12₁、12₂And 12₃Control section 14 of₁And 14₂Transmitted together, a transceiver according to an embodiment may transmit at least two transmission time intervalsWhere the transmissions are directed to the same transmission time interval 12₃Is stored in the storage unit 22₁And 22₂. Transmission time interval 12 of an aspect₁And 12₂And 12 on the other hand₂And 12₃May directly follow each other but may also have a distance in time with respect to each other.

Alternatively or additionally, and as shown in fig. 8c, the specific resource indicated in the reservation information 22 may be the first transmission time interval 12₂The first specific resource of (1). The transceiver may be configured to transmit reservation information 22 to additionally instruct the transceiver to reserve at least one section of a particular resource in the same future transmission time interval, e.g. if the resources contained in the data section may be used by different transceivers. Alternatively or additionally, the transceiver may instruct the transceiver to transmit at different transmission time intervals 12₃At least a further specific resource element is reserved. As mentioned above, the reservation information 22 may point directly to a single resource or set thereof to be used for data transmission, but may also point to the corresponding control segment 14. I.e. fig. 8c shows preemption directed to more than one (re) transmission, while fig. 8b shows several preemption messages 22₁And 22₂To be transmitted.

In other words, the preemption indication message (i.e., reservation information) may be sent in a dedicated control channel (information element) pointing to the upcoming data region (fig. 8a) or regions (fig. 8c) to be preempted by other UEs. To increase reliability, more than one preemption indication message may be sent pointing to the same data region to be preempted by other UEs, as shown in fig. 8 b.

According to the embodiment shown in fig. 8d, the reservation information may be the first reservation information. The transceiver may be configured for a first future transmission time interval 12 using the reserved specific resources₂To transmit the data. The transceiver may be configured to include the second reservation information into a control segment 14 of a future transmission time interval₂In order to reserve resources for retransmitting data in a second different future transmission time interval. That is, fig. 8d uses a control indicating future (re) transmissions.

Sentence changingThe idea shown in fig. 8d is that in the first transmission time interval the control has two functions. It points directly to the same transmission time interval 12₁And it points to a future transmission time interval 12₂Which in turn points to the same transmission time interval 12₂The data in (c).

According to the embodiment shown in fig. 8e, the first reservation information 22₁The indicated specific resource is a first specific resource. Future transmission time interval 12₂Is the first future transmission time interval. The transceiver is configured to transmit reservation information 22 to indicate future transmission time intervals 12₂Reservation 22 of specific resources in₁And indicating a reservation of another particular resource in a second, different future transmission time interval for retransmitting the data. The reservation information 22 may be combined information but may also be implemented as two separate information blocks.

A retransmission of data may be understood as sending (as a retransmission) an exact copy of previously sent data (as in data duplication), a redundancy version of the exact copy, additional data, and/or data different from the transmission in the first future transmission time interval. That is, resources reserved repeatedly or simultaneously may be used to transmit the same data, but are not required to be used in this manner. Fig. 8a, 8b and 8d show dedicated preemption control, while fig. 8d and 8e are directed to duplicate indications for high priority messages. In other words, in another approach, UE transmissions with high priority may use a k-repeat scheme to increase reliability. This may also be used to indicate further (future) transmissions as shown in fig. 8d to be preempted by other UEs. Here, the control information may also point to several (i.e. two or more, e.g. three, four, five, ten or more) data elements, as shown in fig. 8 e. The control 14 may be linked to at least a portion of a data element, i.e., segment 16, where the data may be an exact copy of the first data element, a redundant version thereof, or may contain new or additional data.

According to the embodiment shown in fig. 8f, the future transmission time interval may be the first future transmission time interval 12₂. The transceiver can be equippedIs arranged for scheduling data transmission in a plurality (at least two, at least three, at least four, at least five or at least ten) of future transmission time intervals. The transceiver may be configured to include reservation information 22 in the control segment 14₁For example by using a counter k or different information to indicate a number of reservations of a particular resource in a number of future time frames. The transceiver may transmit in future time interval/slot 12₂、12₃And 12₄Is transmitted with reservation information related to the remaining transmission time interval. For example, the transceiver may indicate that k transmissions are required, k 3. In transmission time interval 12₁The reservation information 22 used in (a) may indicate the reservation of the respective resource in k-3 subsequent transmission time intervals. In transmission time interval 12₂A first transmission may occur and the counter may be decremented so that at transmission time interval 12₂The reservation information 22 sent in (a) may reserve two future transmission time intervals. Thus, after another retransmission k may be decremented again, so that in transmission time interval 12₃The reservation information sent in (1) only points to the transmission time interval 12₄. That is, control may be directed to all remaining retransmissions. The cyclic pattern P may be indicated to achieve the frequency diversity shown in fig. 8 g. In other words, a UE that misses a previous preemption message may benefit by receiving an additional preemption message as shown in fig. 8 f. The control information element may contain a counter indicating the remaining transmissions. Other UEs, upon reading the control information element, may evaluate the control information element and may adjust their channel access accordingly, e.g., defer their transmission by shifting using the information as a Network Allocation Vector (NAV). For example, the retransmission according to fig. 8f may use the same frequency, such that the retransmission occupies the same frequency band when compared to future time slots. The transceiver may be configured to select a future time slot or transmission time interval to occupy resources on the same frequency when compared to the transmission time interval.

According to the embodiment shown in fig. 8g, the transceiver may be configured to select a future transmission time interval to be in transmission time interval 12₁Occupying different frequency bands than time. I.e. when spaced from the transmission time 12₁Time of comparison, future transmission time interval 12₂And 12₃May be arranged in different frequency ranges or bands. The particular frequency f and thus the transmission time interval may be selected according to a pattern of frequencies and/or time. That is, the control may indicate the future time and frequency of the (re-) transmission, e.g. k repetitions in time and a frequency hopping pattern P in frequency.

Note that the different frequency bands may also be aggregated carriers in adjacent frequency bands (contiguous) or any other lower or higher frequency band (non-contiguous), e.g. in a standard Carrier Aggregation (CA) procedure. Note that dual or multi-connectivity may also be allowed in future releases, so that the UE uses more than one frequency band in the same time instance when communicating via a Sidelink (SL) interface.

In other words, all control information elements described in the previous description may point to another control information element, which may also comprise a frequency hopping pattern information element P, indicating different positions possible in e.g. the frequency domain for the upcoming transmission. Alternatively or additionally, different domains, such as space, may be changed so that the hopping pattern or hopping element p may also be related to space. Thus, the transceiver may be configured to select a future transmission time interval to be in transmission time interval 12₁Occupying resources on different frequencies when compared.

The selection according to which different frequencies and/or transmission time intervals are selected may be according to a predetermined frequency pattern. Due to any suitable rule, the predetermined frequency pattern may be set within the system range or may be selected by the transceiver itself. It may be stored in the memory of the transceiver or may be configured by the network and notified to the transceiver. A network may refer herein to a base station or a gNB in a 5G NR network, or an eNB, such as a base station of a UMTS/LTE-a Pro/LTE evo network or any element of a core network, such as an Evolved Packet Core (EPC) or a 5G core network (5 GC). In 5GC, this can be done by using a specific Network Function (NF), such as V2X NF (if present). The stored information may include information relating to the validity of the pattern over a certain period of time. The transceiver may be configured for reserving resources in a plurality of future transmission time intervals and for selecting the plurality of future transmission time intervals according to a predetermined frequency pattern.

According to an embodiment, the transceiver may temporarily store a plurality of frequency modes in its memory by receiving them in operation or during initialization, wherein the transceiver may be configured to select one of the plurality of modes based on a parameter (e.g. monitored data traffic). For example, it may select a mode that is considered to be facing low traffic, i.e. less using frames or transmission time intervals than other modes. Alternatively or additionally, the transceiver may receive control information or a control signal indicating one of a plurality of modes to be selected.

Fig. 9 shows a general example of how a user equipment may preempt its data for high priority transmission by another UE. For example, alternatively or in addition to being implemented to transmit reservation information, the transceiver may be configured to receive reservation information and relinquish its own scheduled transmission in the indicated particular resource. For example, UE1 (transceiver 1) may transmit in time slot 0 and has been scheduled to transmit in time slot 2 (i.e., transmission time interval 12)₃) Is transmitted. In transmission time interval 12₂UE2 (i.e., transceiver 2) may optionally use data segment 16₂And sending the data. The UE2 may send an indication that the UE2 is scheduled in TS2 (i.e., using transmission time interval 12)₃) The retransmitted reservation information 22. UE1 may receive an indication for TS2 and may abort (e.g., defer or cancel) transmission time interval 12₃To avoid collisions with the UE 2.

The transceiver that relinquishes its transmission may make its decision depending on the priority or QoS of the transmission intended to reserve the future transmission time interval. For example, the transceiver may be configured to evaluate a priority of transmission of the indicated UE2 associated with the reservation information. Transceiver UE1 or transceiver 30 may be configured to associate the indicated priority with transmission time interval 12₃The internal priorities of the own planned or scheduled transmissions are compared.In the event that the comparison between priorities results in a comparison result indicating that the UE2 indicated a higher priority than its own, the UE1 may relinquish its transmission. For example, the transceiver UE1 may evaluate the control segment 14₂At least subset 14a (if implemented), and may detect the reservation information 22 sent by the transceiver UE2 and, in response, may relinquish its own scheduled transmission in the indicated particular resource. Otherwise, for example, when the priority of the UE2 is lower than and/or equal to its priority, the UE1 may decide not to relinquish the scheduled transmission based on the comparison result.

That is, independent of the detailed configuration of the control segment 14, a transceiver according to embodiments may be configured to use the control channel to transmit information indicating that the transceiver reserves specific resources in future time slots. The control channel may be a different channel than the transmission time interval having the data segment 16 and the control segment 14.

According to an embodiment, the plurality of resource elements are arranged in a time-frequency grid along groups of subcarriers, wherein each group of subcarriers forms a slot element or transmission time interval occupying a frequency band of the plurality of subcarriers.

The embodiments described therein may be combined with each other, unless otherwise indicated. For example, FIG. 10 shows an implementation in which control segments 14 of different transmission time intervals are used₁And 14₂To signal the pointing to the same transmission time interval 12₃Is stored in the storage unit 22₁And 22₂As described in connection with fig. 8 b. Furthermore, the control section 14₃For transmitting a transmission directed to two future transmission time intervals 12₅And 12₆And reservation information 22, and in transmission time interval 12₅By pointing to the transmission time interval 12₆Indicating its repetition. Furthermore, a transmission time interval 12₄(accordingly its control section 14)₄) For indicating a transmission time interval 12₅Resource reservation of (2).

In other words, all the described scenarios can be combined in all possible ways to reduce signaling overhead and/or increase reliability. Furthermore, all examples of preemption in the time and/or frequency domain may also apply in the spatial domain, e.g. involving beamforming when transmitting to a certain direction.

As can be seen from fig. 9, a scenario may occur in which: more than one transceiver attempts to transmit by using the same resource (e.g., the same complete data segment of a transmission time interval). For example, the UE1 of fig. 9 may decide not to relinquish its own transmission, e.g., due to the same or even higher priority transmission, but the UE2 uses transmission time interval 12 based on reservation information 22₃A transmission is attempted.

To avoid conflicts, embodiments relate to conflict management or conflict resolution. The transceiver may be configured to reserve specific resources and at least one further specific resource for the same transmission, e.g. it may reserve resources of two different time slots, frequency bands or transmission time intervals. In future time slots, the transceiver may be configured to perform collision avoidance, i.e. implement appropriate mechanisms to avoid collisions with other transceivers. For example, the transceiver may use the reserved resources without conflict. For example, the transceiver may be configured to perform a mechanism known as Listen Before Talk (LBT) for collision avoidance. Such a mechanism may implement a transmission individual or transceiver individual backoff counter that determines when the transceiver listens to (i.e., receives or senses) the corresponding channel. After the counter has elapsed and no signal is detected, the transceiver may determine the channel as idle and may access the corresponding resource. The backoff counter may be a random value backoff counter for allowing some fairness in delaying transmission. The parameters of the back-off algorithm may be pre-configured, provided by the network, or may be negotiated between UEs, e.g. depending on the priority status of the UEs.

Preferably, the transceiver is configured to select a further specific resource in a different frequency than the specific resource, as shown in fig. 11. Fig. 11 shows a schematic diagram of a plurality of transmission time intervals arranged over an exemplary number of three sub-channels SC1 to SC 3. As an example, a time interval of four time slots or transmission time intervals is shown, and each transmission time interval occupies, as an example, a complete time slot TS1 to TS 4. Transmission time interval 12_ijIs shown so as to use a referenceThe number "i" indicates the subchannel SC used and the corresponding time slot TS with the parameter "j". Thus, transmission time interval 12₁₁Refers to the first subchannel and the first time slot, in which the transmission time interval 12₃₁Refers to the third subchannel and the first slot, and a transmission time interval 12₃₄Refer to the third subchannel and the fourth time slot.

The number of subchannels and the number of slots may have any value.

For example, a transceiver (e.g., transceiver 30 referred to as UE1) may belong to transmission time interval 12₁₁Control section 14 of₁₁Indicating reservation information 22₁To be in transmission time interval 12₁₃To reserve one or more resources and to indicate reservation information 22₂To be in transmission time interval 12₃₃In which one or more (e.g., a corresponding number of) resources are reserved. Transmission time interval 12₁₃And 12₃₃May be transmitted simultaneously but in different subchannels. By way of example, different transceivers (e.g., UE2) use transmission time interval 12₁₂And a subsequent transmission time interval 12₁₃Transmitted in sub-channel 1, resulting in a transmission time interval 12 for use₁₃Conflict in interests. A transceiver that has sent reservation information may listen (i.e., receive) that the UE2 does not preempt the transmission time interval 12₁₃But information in which data is transmitted. At the same time, the transceiver can determine the transmission time interval 12₃₃Unused, as initial unused or as a pair of reservation information 22₂And will select the resources of subchannel 3 in slot 3 for transmission.

Although reservation information 22 may also be selected and reserved₁And 22₂Different time slots, but selecting the same time slot may allow ensuring transmission within a particular time, since only different frequency bands are selected. Either only one transmission time interval is selected for reservation or, as shown in fig. 11, two transmission time intervals are selected and the transceiver may be configured for reservation in a larger number of transmission time intervals or time slots at the same or different times. Alternatively or in addition to changing frequency while maintaining time slotsThe time slot may be adapted.

Although fig. 11 illustrates collision avoidance in a time-frequency grid, collision avoidance may also take advantage of spatial variation.

In other words, when a UE reserves resources in a future time slot, it essentially requires another UE that intends to use the resources in the future time slot to suppress/relinquish its transmission. However, this may lead to collisions in the transmission.

The first possible collision is, for example, that a UE (UE 2 in fig. 11) that originally intended to use the reserved time slot has been scheduled to use resources within the time slot in an SPS manner, e.g., to send a high priority transmission. Yet a second possible collision may be that more than one UE reserves the same resources for high priority transmissions within the same future time slot.

To resolve these conflicts, embodiments allow the UE to reserve more than one resource in a slot. When a UE (e.g., UE1) sends a preemptive reservation in slot 1 using PSCCH1 to reserve resources in a future slot (e.g., slot 3 or any other slot) for a high priority transmission, the UE reserves two or more resources in slot 3 but in different sub-channels.

The UE may then perform short-term sensing (e.g., Listen Before Talk (LBT) using a random backoff counter) within slot 3 in order to determine which of the resources reserved across the different subchannels may be used. When the UE1 has reserved more than one resource in slot 3, UE2, which has been scheduled for a high priority transmission using one of the reserved resources, will not vacate that resource. Only if the transmission priority of UE1 is higher than the transmission priority of UE2 will UE2 vacate resources. If the priority is equal to or less than the transmission priority of the UE2, then the UE2 will not vacate resources according to the present example. The transmission priority of UE1 is indicated in the preemption reservation message in PSCCH1 sent in slot 1, so UE2 knows the transmission priority of UE 1. Based on these embodiments, the UE1 would then perform LBT on slot 3 to determine which of the two reserved resources are available and would transmit in the available resources. LBT is also advantageous if more than one UE reserves the same resources due to its random backoff counter. Two UEs will have different backoff counters enabling them to listen and check if any other UE will use the relevant resources. Embodiments may be implemented in mobile communications, in particular in vehicular communication systems, e.g. V2X, as implemented in the context of cellular (e.g. 3G, 4G, 5G or future) or ad hoc communication networks.

Fig. 12 shows a schematic block diagram of a wireless communication network 120 comprising at least one transceiver 30 and at least one transceiver 34 according to an embodiment. Transceiver 34 may be configured to relinquish its own transmission in response to reservation information 22. As described above, the transceiver 34 may be another transceiver 30 implemented to transmit the reservation information 22 and react to it by implementing a discard 36 of its own transmissions.

Although some aspects have been described in the context of an apparatus, it will be clear that these aspects also represent a description of the respective method, wherein a block or device corresponds to a method step or a feature of a method step. Similarly, aspects described in the context of method steps also represent a description of a respective block or item or a feature of a respective apparatus.

Embodiments of the invention may be implemented in hardware or in software, depending on certain implementation requirements. Implementations may be implemented using a digital storage medium (e.g., a floppy disk, a DVD, a CD, a ROM, a PROM, an EPROM, an EEPROM or a FLASH memory) having electronically readable control signals stored thereon, in cooperation with (or capable of cooperating with) a programmable computer system such that the corresponding method is performed.

Some embodiments according to the invention comprise a data carrier with electronically readable control signals capable of cooperating with a programmable computer system so as to perform one of the methods described herein.

Generally, embodiments of the invention can be implemented as a computer program product having a program code operable to perform one of the methods when the computer program product runs on a computer. The program code may be stored, for example, on a machine-readable carrier.

Other embodiments include a computer program stored on a machine-readable carrier for performing one of the methods described herein.

In other words, an embodiment of the inventive method is thus a computer program with a program code for performing one of the methods described herein, when the computer program runs on a computer.

Thus, another embodiment of the inventive method is a data carrier (or digital storage medium or computer readable medium) comprising a computer program recorded thereon for performing one of the methods described herein.

Thus, another embodiment of the inventive method is a data stream or a signal sequence representing a computer program for performing one of the methods described herein. The data stream or signal sequence may for example be arranged to be transmitted via a data communication connection (e.g. via the internet).

Another embodiment comprises a processing device, e.g., a computer or a programmable logic device, configured or adapted to perform one of the methods described herein.

Another embodiment comprises a computer having a computer program installed thereon for performing one of the methods described herein.

In some embodiments, a programmable logic device (e.g., a field programmable gate array) may be used to perform some or all of the functions of the methods described herein. In some embodiments, a field programmable gate array may cooperate with a microprocessor to perform one of the methods described herein. In general, the method is preferably performed by any hardware device.

The above-described embodiments are merely illustrative of the principles of the present invention. It is to be understood that modifications and variations of the arrangements and details described herein will be apparent to others skilled in the art. It is therefore intended that the scope of the appended patent claims be limited only by the details of the description and the explanation of the embodiments herein, and not by the details of the description and the explanation.

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