CN111480379A

CN111480379A - User equipment and wireless communication method thereof

Info

Publication number: CN111480379A
Application number: CN201880081044.8A
Authority: CN
Inventors: 唐海; 林晖闵
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2018-02-14
Filing date: 2018-02-14
Publication date: 2020-07-31
Anticipated expiration: 2038-02-14
Also published as: WO2019157730A1; CN111480379B

Abstract

A user equipment includes a memory and a processor coupled to the memory. The processor is configured to perform communication to the at least one second user equipment through the sidelink interface and map and transmit at least one data Transport Block (TB) to the at least one second user equipment using the at least one sidelink resource unit of the sidelink resource pool. The sidelink resource pool includes a plurality of sidelink resource units and a plurality of frequency regions in the frequency domain. The side link resource units are channelized by grouping the side link resource units into multiple transport channels. Each transport channel includes at least two consecutive sidelink resource units in the time domain. Each sidelink resource unit in a transport channel is located in a different frequency region.

Description

User equipment and wireless communication method thereof

Background of the disclosure

1. Field of the disclosure

The present disclosure relates to the field of communication systems, and more particularly, to a user equipment and a wireless communication method thereof.

2. Description of the related Art

In the Long term evolution (L TE) radio access technology, current sidelink mode 4 operation requires that a transmitting user equipment (Tx UE) autonomously randomly selects radio resources among its own available resources within a sidelink resource pool for packet data transmission in which operation all resources required for sidelink transmission need to be detected and selected, respectively, for initial transmission and all retransmissions of a data Transport Block (TB). The resources may be scattered throughout the sidelink resource pool without being guaranteed that they may meet delay requirements associated with data messages missed.

In the fifth generation of new wireless (5G-NR) systems in the future, there is an increasing demand for emergency transmission of data over sidelink/PC 5 interfaces to support public safety, road safety and mission critical communications at the same time the data delay requirements for end-to-end communications become very short, at the same time these applications and use cases require the delivery of higher reliability messages without errors.

Disclosure of Invention

An object of the present disclosure is to propose a User Equipment (UE) and a wireless communication method thereof for solving the described problems for sidelink communication in the prior art through channelization of resources in a sidelink resource pool.

In a first aspect of the disclosure, a user equipment for wireless communication includes a memory and a processor coupled to the memory. The processor is configured to perform communication to the at least one second user equipment through the sidelink interface and map and transmit at least one data Transport Block (TB) to the at least one second user equipment using the at least one sidelink resource unit of the sidelink resource pool. The sidelink resource pool includes a plurality of sidelink resource units and a plurality of frequency regions in the frequency domain. The side link resource units are channelized by grouping the side link resource units into multiple transport channels. Each transport channel includes at least two consecutive sidelink resource units in the time domain. Each sidelink resource unit in a transport channel is located in a different frequency region.

According to an embodiment in connection with the first aspect of the disclosure, a sidelink resource pool of size N Physical Resource Blocks (PRBs) based on network configuration or pre-configuration is divided into a plurality of equally sized sidelink resource units, each of the equally sized sidelink resource units having m PRBs in the frequency domain and one Transmission Time Interval (TTI) length in the time domain.

According to an embodiment incorporating the first aspect of the present disclosure, for normal TTI transmissions, one TTI length has a duration of one slot of 14 symbols.

According to an embodiment in combination with the first aspect of the disclosure, for short TTI transmissions, one TTI length has a shorter duration than one slot of at least three symbols.

According to an embodiment incorporating the first aspect of the present disclosure, the frequency hopping pattern of the sidelink resource units in the transmission channel z is according to the following:

wherein X is the number of sidelink resource units in a transmission channel z for initial transmission and all retransmissions of at least one data TB, X is also the number of frequency zones, K is the number of sidelink resource units in the frequency domain, K is equal to N/m, l is the l-th sidelink resource unit in the transmission channel z, and z is the index number of the transmission channel.

According to an embodiment incorporating the first aspect of the present disclosure, all sidelink Resource Units (RUs) for a transmission channel z in time and frequency domain are satisfied

For l 0, …, X-1

Where k is a frequency index of the sidelink resource units in the frequency domain.

According to an embodiment in combination with the first aspect of the disclosure, the sidelink resource pool in the frequency domain is further divided into X equal-sized frequency bins based on a network configuration or pre-configuration, and each of the equal-sized frequency bins comprises at least one contiguous sidelink resource unit.

According to an embodiment incorporating the first aspect of the present disclosure, the sidelink resource units are arranged consecutively in a plurality of groups in the time domain, and each group of sidelink resource units has a length of X TTIs for transmitting an initial transmission and all retransmissions of at least one data TB.

According to an embodiment incorporating the first aspect of the present disclosure, X TTIs are also the length of one transport channel, and the value of X in the number of TTIs is the same as the value of X in the number of frequency zones.

According to an embodiment incorporating the first aspect of the present disclosure, within each group of sidelink resource elements in the time domain, a first TTI location is designated for initial transmission of at least one data TB, a second TTI location is for first retransmission, a third TTI location is for second retransmission, and a last TTI location is for last retransmission.

According to an embodiment incorporating the first aspect of the present disclosure, the channelization of the sidelink resource units over a period of one transport channel length of X TTIs is by grouping X sidelink resource units, one sidelink resource unit being derived from each frequency region and each TTI location.

According to an embodiment incorporating the first aspect of the disclosure, each transport channel comprises X number of sidelink resource units, wherein one sidelink resource unit is derived from a first frequency region and a first TTI location and another sidelink resource unit is derived from a second frequency region and a second TTI location.

According to an embodiment incorporating the first aspect of the present disclosure, the current sidelink resource unit is located in the last frequency zone and the next sidelink resource unit is located in the first frequency zone.

According to an embodiment incorporating the first aspect of the present disclosure, the number of frequency zones is the same as the number of sidelink resource units in one transmission channel.

According to an embodiment in combination with the first aspect of the disclosure, each frequency region comprises at least one sidelink resource unit.

According to an embodiment in combination with the first aspect of the disclosure, all frequency bins have equal size.

According to an embodiment incorporating the first aspect of the disclosure, all sidelink resource units are of equal size.

In a second aspect of the disclosure, a method of wireless communication of a user equipment includes: performing a communication to the at least one second user equipment through the sidelink interface, and mapping and transmitting the at least one data Transport Block (TB) to the at least one second user equipment using the at least one sidelink resource unit of the sidelink resource pool. The sidelink resource pool includes a plurality of sidelink resource units and a plurality of frequency regions in the frequency domain. The side link resource units are channelized by grouping the side link resource units into multiple transport channels. Each transport channel includes at least two consecutive sidelink resource units in the time domain. Each sidelink resource unit in a transport channel is located in a different frequency region.

According to an embodiment incorporating the second aspect of the present disclosure, a sidelink resource pool of size N Physical Resource Blocks (PRBs) based on network configuration or pre-configuration is divided into a plurality of equally sized sidelink resource units, each of the equally sized sidelink resource units having m PRBs in the frequency domain and one Transmission Time Interval (TTI) length in the time domain.

According to an embodiment incorporating the second aspect of the present disclosure, for normal TTI transmissions, one TTI length has a duration of one slot of 14 symbols.

According to an embodiment in combination with the second aspect of the disclosure, for short TTI transmissions, one TTI length has a shorter duration than one slot of at least three symbols.

According to an embodiment incorporating the second aspect of the present disclosure, the frequency hopping pattern of the sidelink resource units in the transmission channel z is according to:

According to an embodiment incorporating the second aspect of the present disclosure, all sidelink Resource Units (RUs) for a transmission channel z in time and frequency domain are satisfied

For l 0, …, X-1

According to an embodiment in combination with the second aspect of the disclosure, the sidelink resource pool in the frequency domain is further divided into X equal-sized frequency bins based on a network configuration or pre-configuration, and each of the equal-sized frequency bins comprises at least one contiguous sidelink resource unit.

According to an embodiment incorporating the second aspect of the present disclosure, the sidelink resource units are arranged consecutively in a plurality of groups in the time domain, and each group of sidelink resource units has a length of X TTIs for transmitting an initial transmission and all retransmissions of at least one data TB.

According to an embodiment incorporating the second aspect of the present disclosure, X TTIs are also the length of one transport channel, and the value of X in the number of TTIs is the same as the value of X in the number of frequency zones.

According to an embodiment incorporating the second aspect of the present disclosure, within each group of sidelink resource elements in the time domain, a first TTI location is designated for initial transmission of at least one data TB, a second TTI location is used for first retransmission, a third TTI location is used for second retransmission, and a last TTI location is used for last retransmission.

According to an embodiment incorporating the second aspect of the present disclosure, the channelization of the sidelink resource units over a period of one transport channel length of X TTIs is by grouping X sidelink resource units, one sidelink resource unit being derived from each frequency region and each TTI location.

According to an embodiment incorporating the second aspect of the present disclosure, each transport channel comprises X number of sidelink resource units, wherein one sidelink resource unit is derived from a first frequency region and a first TTI location and another sidelink resource unit is derived from a second frequency region and a second TTI location.

According to an embodiment incorporating the second aspect of the present disclosure, the current sidelink resource unit is located in the last frequency zone and the next sidelink resource unit is located in the first frequency zone.

According to an embodiment incorporating the second aspect of the present disclosure, the number of frequency zones is the same as the number of sidelink resource units in one transmission channel.

According to an embodiment incorporating the second aspect of the disclosure, each frequency region comprises at least one sidelink resource unit.

According to an embodiment incorporating the second aspect of the present disclosure, all frequency bins have equal size.

According to an embodiment incorporating the second aspect of the disclosure, all sidelink resource units are of equal size.

In an embodiment of the present disclosure, a user equipment and a wireless communication method thereof solve the described problems for sidelink communication in the prior art by channelization of resources in a sidelink resource pool, provide fast and robust data transmission for New Radio (NR) sidelink communication through fixed transmission patterns and frequency hopping, and provide high utilization of sidelink radio resources.

Drawings

In order to more clearly explain embodiments of the present disclosure or related art, the following drawings, which will be described in the embodiments, are briefly introduced. It is to be understood that the drawings are merely exemplary of the disclosure and that other drawings may be derived by one of ordinary skill in the art without undue effort.

Fig. 1 is a block diagram of a user equipment for wireless communication according to an embodiment of the present disclosure.

Fig. 2 is a block diagram of sidelink resources in accordance with an embodiment of the present disclosure.

Fig. 3 is a block diagram of a sidelink resource pool in accordance with an embodiment of the present disclosure.

Fig. 4 is a scenario of vehicle-associated-everything (V2X) communication according to an embodiment of the present disclosure.

Fig. 5 is a flowchart illustrating a wireless communication method according to the present disclosure in terms of an operation of a user equipment for transmitting a signal.

Detailed description of the embodiments

Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings by technical subject matter, structural features, attained objects, and effects. In particular, the terminology used in the embodiments of the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure.

Fig. 1 and 2 show that in some embodiments, a user equipment 100 for wireless communication includes a memory 102 and a processor 104 coupled to the memory 102. The processor 104 is configured to perform wireless communication to at least one second user equipment 200 directly through a side-link interface, such as a PC5 interface. The processor 104 is configured to map and transmit at least one data Transport Block (TB) to at least one second user equipment 200 using at least one sidelink resource unit 301 of the sidelink resource pool 300. The sidelink resource pool 300 includes a plurality of sidelink resource units 301 and a plurality of frequency regions 302 in the frequency domain. The channelization of the sidelink resource units 301 is by grouping the sidelink resource units 301 into multiple transmission channels, such as CH _1309, 310, and 311, CH _ 2312, and CH _ z 313 shown in FIG. 2. Each of the transport channels (e.g., CH _1309, 310, and 311, CH _ 2312, and CH _ z 313) includes at least two consecutive sidelink resource units 301 in the time domain. Each sidelink resource unit 301 in one transport channel (e.g., CH _1309, 310, and 311, CH _ 2312, and CH _ z 313) is located in a different frequency zone 302.

In an embodiment of the present disclosure, the user equipment solves the described problems with sidelink communications in the prior art by channelization of sidelink resource units 301 in a sidelink resource pool 300, providing fast and robust data transmission for New Radio (NR) sidelink communications through fixed transmission patterns and frequency hopping, and providing high utilization of sidelink radio resources.

In some embodiments, communication between the user equipment 100 and the user equipment 200 over a sidelink interface, such as a PC5 interface, may be based on Long term evolution (L TE) sidelink technology developed under the third Generation partnership project (3GPP) and/or 5 th Generation New radio (5G-NR) radio access technology.

In some embodiments, both

memories

102 and 202 may include Read Only Memory (ROM), Random Access Memory (RAM), flash memory, memory cards, storage media, and/or other storage devices. Both

processors

104 and 204 may include Application Specific Integrated Circuits (ASICs), other chipsets, logic circuitry, and/or data processing devices. Both

processors

104 and 204 may also include baseband circuitry to process radio frequency signals. When the embodiments are implemented in software, the techniques described herein may be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. These modules may be stored in the

memories

102 and 202 and executed by the

processors

104 and 204. The

memories

102 and 202 may be implemented within the

processors

104 and 204 or external to the

processors

104 and 204, in which case the

memories

102 and 202 may be communicatively coupled to the

processors

104 and 204 via various means as is known in the art.

In particular, fig. 2 shows that in some embodiments, a sidelink (S L) resource pool 300 of size N Physical Resource Blocks (PRBs) based on network configuration or pre-configuration is divided into a plurality of equally sized S L resource units 301, each S L resource unit 301 having m PRBs in the frequency domain and a length of one Transmission Time Interval (TTI) in the time domain.

The S L resource pool 300 in frequency domain is further divided into X equal-sized frequency regions 302 based on network configuration or pre-configuration, each frequency region 302 includes at least one consecutive S L resource elements S L resource elements are arranged consecutively in time domain into

groups

303, 304, and 305, and each

group

303, 304, and 305 has a length of X TTIs required for transmitting an initial transmission 306 and all

retransmissions

307 and 308 of a data Transport Block (TB), the number X of TTIs is also the length of a transmission (Tx) channel, and the value of X is the same as the value of X for the number of frequency regions 302.

Further, within each

group

303, 304 and 305 of S L resource elements in the time domain, a first TTI position is specified for initial transmission 306 of the data message TB, a second TTI position is used for first retransmission 307, a third TTI position is used for second retransmission 308, and so on.

As shown by exemplary Tx channels such as CH _1309, 310 and 311, Tx channel CH _1 includes X S L resource units, one resource unit 301 is derived from the first frequency zone 302 and first TTI location 309, one resource unit 301 is derived from the second frequency zone 302 and second TTI location 310, and so on until one resource unit 301 is derived from the last frequency zone 302 and last TTI location 311. thus, the S L resource units of CH _1309, 310 and 311 are hopped within the Tx channel, and the hopping rule is defined such that the next S2 resource unit 301 is located in the next adjacent frequency zone 302. if the current S L resource unit 301 is located in the last frequency zone 302, the next S L resource unit 301 may be located in the first adjacent frequency zone 302. the channelization process is similarly performed for other Tx channels such as CH 2. the channelization process for other Tx channels such as CH _ 2112 and CH _ 387 113 is also performed.

It is understood that in some embodiments, the frequency hopping pattern of the sidelink resource units 301 in the transmission channel z is according to the following:

where X is the number of sidelink resource units 301 within the transmission channel z for the initial transmission 306 and all

retransmissions

307 and 308 of at least one data TB, X is also the number of frequency bins 302, K is the number of sidelink resource units 301 in the frequency domain, K is equal to N/m, l is the l-th sidelink resource unit 301 within the transmission channel z, and z is the index number of the transmission channel.

In some embodiments, all sidelink Resource Units (RUs) 301 for a transmission channel z in time and frequency domain satisfy

For l ═ 0, …, X-1

Where K is the frequency index of the sidelink resource units 301 in the frequency domain of the sidelink resource pool 300, the number of S L resource units 301 in the frequency domain is indexed to 0, …, K, …, K, the number of S L resource units 301 within one Tx channel length in the time domain is indexed to 0, …, l, …, X-1, and the total number of Tx channels within N PRBs and spanning X TTIs is Z, indexed to 1, …, Z …, Z.

The same channelization process applies to all other groups 304 and 305 of S L resource elements fig. 3 shows that in some embodiments, an illustration of the indices and time-frequency locations of the S L resource elements for all Tx channels in the sidelink resource pool 400 is provided, one Tx channel length 402.16 resource elements for a sidelink resource pool 400 having 16 resource elements and 4 nTTI or sTTI is also the number of Tx channels 401 one Tx channel length for 4 nTTI or sTTI402 is also the number of frequency regions 403.

The time-frequency resource elements for Tx channel 1 can be found in

symbols

404, 405, 406, and 407 according to the following equation. Tx channel 1(l, k) ═ RU (0,0), RU (1,4), RU (2,8), RU (3, 12).

The time-frequency resource elements for Tx channel 6 can be found in

symbols

408, 409, 410 and 411 according to the following equation. Tx channel 6(l, k) ═ RU (0,5), RU (1,9), RU (2,13), RU (3, 1).

The time-frequency resource elements for the Tx channel 11 can be found in

symbols

412, 413, 414 and 415 according to the following equation. Tx channel 11(l, k) ═ RU (0,10), RU (1,14), RU (2,2), RU (3, 6).

The time-frequency resource elements for the Tx channel 16 may be found in

symbols

416, 417, 418, and 419 according to the following equation. Tx channel 16(l, k) ═ RU (0,15), RU (1,3), RU (2,7), RU (3, 11).

Fig. 4 illustrates that in some embodiments, communication between user equipment 100 and user equipment 200 involves vehicle-to-vehicle (V2X) communication in accordance with L TE sidestream technology and/or 5G-NR radio access technology developed by the third generation partnership project (3GPP), where V2X communication includes vehicle-to-vehicle (V2V), vehicle-to-pedestrian (V2P) and vehicle-to-infrastructure/network (V2I/N).

user equipment

100 and 200 communicate directly with each other over a sidestream link interface, such as a PC5 interface.

Fig. 5 illustrates a method 500 of wireless communication in accordance with the present disclosure in terms of operation of user equipment 100 for transmitting signals. The method 500 includes: wireless communication is performed directly to the at least one second user equipment 200 through the sidelink interface at block 502, and at least one data Transport Block (TB) is mapped and transmitted to the at least one second user equipment 200 using at least one sidelink resource unit of the sidelink resource pool at block 504. The sidelink resource pool includes a plurality of sidelink resource units and a plurality of frequency regions in the frequency domain. The side link resource units are channelized by grouping the side link resource units into multiple transport channels. Each transport channel includes at least two consecutive sidelink resource units in the time domain. Each sidelink resource unit in a transport channel is located in a different frequency region.

In an embodiment of the present disclosure, a user equipment and a wireless communication method thereof solve the described problems of the prior art for sidelink communication in a 5G-NR system through channelization of resources in a sidelink resource pool, provide fast and robust data transmission for new wireless (NR) sidelink communication through fixed transmission patterns and frequency hopping, and provide high utilization of sidelink radio resources.

In summary, embodiments of the present disclosure have at least one of the following advantages through channelization of resources in a sidelink resource pool.

1. Ensuring that the initial transmission and all retransmissions/repetitions of the sidelink data TB are delivered within the delay requirement.

2. The frequency diversity gain is fully utilized.

3. Fast receiver combining is performed from a fixed resource location within the transmission (Tx) channel.

4. If the receiving UE misses one of the sidelink resources due to the U L operation, the UE can still listen and combine subsequent retransmissions of the same data TB.

5. Sidelink control information is reduced without having to indicate the time and frequency location of the next sidelink resource for retransmission. Higher reliability and faster decoding of the PSCCH is provided. Fewer sidelink resources (symbols) and faster decoding required for PSCCH transmission are provided.

6. Due to the structured approach, a higher utilization of sidelink resources is strongly caused.

7. The initial transmission and retransmission of the same data TB have no separate resource contention. In general, there is less contention for resources, and it is only necessary to reserve for the initial transmission and all retransmissions of the data TB once.

One of ordinary skill in the art understands that each unit, algorithm, and step described and disclosed in the embodiments of the present disclosure is implemented using electronic hardware or a combination of software and electronic hardware for a computer. Whether these functions are run in hardware or software depends on the conditions and design requirements of the application of the solution. Those of ordinary skill in the art may implement the functionality of each particular application in different ways without departing from the scope of the present disclosure.

A person skilled in the art will understand that he/she may refer to the working processes of the systems, devices and units in the above embodiments, since the working processes of the systems, devices and units are substantially the same. For convenience and brevity, these operations will not be described in detail.

It should be understood that the systems, devices, and methods disclosed in the embodiments of the present disclosure may be implemented in other ways. The above embodiments are merely exemplary. The division of cells is based on logic functions only, while other divisions exist in the implementation. Multiple units or components may be combined or integrated in another system. It is also possible to omit or skip certain features. On the other hand, the mutual coupling, direct coupling or communicative coupling shown or discussed can be achieved indirectly or communicatively via some port, device or element, whether electrically, mechanically or otherwise.

Units that are separate components for illustration are physically separate or not. The unit for displaying is a physical unit or not, i.e. located in one place or distributed over a plurality of network units. Some or all of the elements are used for purposes of the embodiments.

Furthermore, each functional unit in each embodiment may be integrated in one processing unit, may be physically independent, or may be integrated in one processing unit having two or more units.

If the software functional unit is implemented, used, or sold as a product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solutions proposed by the present disclosure can be implemented basically or partially in the form of software products. Alternatively, a part of the technical solution that is advantageous to the conventional technology may be implemented in the form of a software product. The software product in a computer is stored in a storage medium that includes a plurality of commands for a computing device (e.g., a personal computer, server, or network device) to perform all or a portion of the steps disclosed in embodiments of the present disclosure. The storage medium includes a USB disk, a removable hard disk, a Read Only Memory (ROM), a Random Access Memory (RAM), a floppy disk, or other medium capable of storing program code.

While the present disclosure has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the disclosure is not to be limited to the disclosed embodiment, but is intended to cover various arrangements made without departing from the scope of the broadest interpretation of the appended claims.

Claims

1. A user equipment for wireless communication, comprising:

a memory; and

a processor coupled to the memory, the processor configured to:

performing communication to at least one second user equipment through a sidelink interface; and

mapping and transmitting at least one data transport block, TB, to the at least one second user equipment using at least one sidelink resource unit of a sidelink resource pool, wherein the sidelink resource pool comprises a plurality of sidelink resource units and a plurality of frequency regions in frequency domain, the sidelink resource units are channelized by grouping the sidelink resource units into a plurality of transport channels, each of the transport channels comprises at least two consecutive sidelink resource units in time domain, and each of the sidelink resource units in one transport channel is located in a different frequency region.

2. The user equipment according to claim 1, wherein the side link resource pool of size N physical resource blocks, PRBs, based on network configuration or pre-configuration is divided into a plurality of equal-sized side link resource units, each of which has m PRBs in the frequency domain and one transmission time interval, TTI, length in the time domain.

3. The user equipment of claim 2, wherein for normal TTI transmissions, one TTI length has a duration of one slot of 14 symbols.

4. The user equipment of claim 2, wherein for a short TTI transmission, one TTI length has a shorter duration than one slot of at least three symbols.

5. The user equipment of claim 2, wherein the frequency hopping pattern of the sidelink resource units in transmission channel z is according to:

wherein X is the number of sidelink resource units within the transmission channel z for initial transmission and all retransmissions of the at least one data TB, X is also the number of frequency regions, K is the number of sidelink resource units within the frequency domain, K is equal to N/m, l is the l-th sidelink resource unit within the transmission channel z, and z is the index number of the transmission channel.

6. The user equipment of claim 5, wherein all the side uplink resource units RU for the transmission channel z in the time and frequency domains satisfy

For l 0, …, X-1

7. The user equipment of claim 1, wherein the sidelink resource pool in the frequency domain is further partitioned into X equal-sized frequency regions based on a network configuration or pre-configuration, and each of the equal-sized frequency regions comprises at least one contiguous sidelink resource unit.

8. The user equipment of claim 7, wherein the sidelink resource units are arranged consecutively in a plurality of groups in the time domain, and each group of the sidelink resource units has a length of the X TTIs for transmitting initial transmissions and all retransmissions of the at least one data TB.

9. The user equipment of claim 8, wherein the X TTIs are also the length of one transport channel, and a value of X of the number of TTIs is the same as a value of X of the number of frequency regions.

10. The user equipment of claim 9, wherein, within each group of the sidelink resource elements in the time domain, a first TTI location is designated for the initial transmission of the at least one data TB, a second TTI location is designated for a first retransmission, a third TTI location is designated for a second retransmission, and a last TTI location is designated for a last retransmission.

11. The user equipment of claim 8, wherein channelization of sidelink resource units over a period of one transport channel length for X TTIs is by grouping X sidelink resource units, one from each frequency bin and each TTI location.

12. The user equipment of claim 8, wherein each transport channel includes X of the sidelink resource units, wherein one sidelink resource unit is from a first frequency region and a first TTI location and another sidelink resource unit is from a second frequency region and a second TTI location.

13. The user equipment of claim 1, wherein a current sidelink resource unit is located in a last frequency region and a next sidelink resource unit is located in a first frequency region.

14. The user equipment of claim 1, wherein the number of frequency zones is the same as the number of sidelink resource units in one transmission channel.

15. The user equipment of claim 1, wherein each of the frequency regions comprises at least one sidelink resource unit.

16. The user equipment of claim 1, wherein all of the frequency regions are of equal size.

17. The user equipment of claim 1, wherein all of the sidelink resource units are of equal size.

18. A method of wireless communication of a user equipment, comprising:

19. The method of claim 18, wherein the sidelink resource pool of size N physical resource blocks, PRBs, based on network configuration or pre-configuration is divided into a plurality of equally sized sidelink resource units, each of the equally sized sidelink resource units having m PRBs in the frequency domain and one transmission time interval, TTI, length in the time domain.

20. The method of claim 19, wherein one TTI length has a duration of one slot of 14 symbols for normal TTI transmissions.

21. The method of claim 19, wherein for a short TTI transmission, one TTI length has a shorter duration than one slot of at least three symbols.

22. The method of claim 19, wherein a frequency hopping pattern of the sidelink resource units in transmission channel z is according to:

23. The method of claim 22, wherein all of the sidelink resource units RU for the transmission channel z in the time domain and the frequency domain satisfy

For l 0, …, X-1

24. The method of claim 18, wherein the sidelink resource pool in the frequency domain is further divided into X equal-sized frequency bins based on a network configuration or pre-configuration, and each of the equal-sized frequency bins comprises at least one contiguous sidelink resource unit.

25. The method of claim 24, wherein the sidelink resource units are arranged consecutively in groups in the time domain, and each group of the sidelink resource units has a length of the X TTIs for transmitting initial transmissions and all retransmissions of the at least one data TB.

26. The method of claim 25, wherein the X TTIs are also a length of one transport channel, and a value of X in the number of TTIs is the same as a value of X in the number of frequency regions.

27. The method of claim 26, wherein, within each group of the sidelink resource elements in the time domain, a first TTI location is designated for the initial transmission of the at least one data TB, a second TTI location is designated for a first retransmission, a third TTI location is designated for a second retransmission, and a last TTI location is designated for a last retransmission.

28. The method of claim 25, wherein channelization of sidelink resource units over a period of one transport channel length for X TTIs is grouped by X sidelink resource units, one sidelink resource unit from each frequency bin and each TTI location.

29. The method of claim 25, wherein each transport channel includes X number of the sidelink resource units, wherein one sidelink resource unit is from a first frequency region and a first TTI location and another sidelink resource unit is from a second frequency region and a second TTI location.

30. The method of claim 18, wherein a current sidelink resource unit is located in a last frequency region and a next sidelink resource unit is located in a first frequency region.

31. The method of claim 18, wherein the number of frequency bins is the same as the number of sidelink resource units in one transmission channel.

32. The method of claim 18, wherein each of the frequency bins comprises at least one sidelink resource unit.

33. The method of claim 18, wherein all of the frequency bins are of equal size.

34. The method of claim 18, wherein all of the sidelink resource units are of equal size.