CN111492708B

CN111492708B - User equipment and wireless communication method thereof

Info

Publication number: CN111492708B
Application number: CN201880082658.8A
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: 2021-11-19
Anticipated expiration: 2038-02-14
Also published as: CN111492708A; WO2019157739A1

Abstract

The user equipment includes a memory and a processor coupled to the memory. The processor is configured to wirelessly communicate directly with at least one second user equipment over a sidelink interface, monitor and read at least one sidelink resource used by the at least one second user equipment, determine a plurality of first sidelink resources available for transmission of a plurality of preemption signals and a plurality of second sidelink resources available for transmission of a plurality of sidelink data Transport Blocks (TBs), perform a plurality of preemption procedures to reserve the second sidelink resources by transmitting the preemption signals, and transmit the sidelink data TBs using the reserved second sidelink resources and reserve a plurality of identical frequency resources for subsequent transmissions using the second sidelink resources in a current transmission.

Description

User equipment and wireless communication method thereof

Technical Field

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

Background

In Long Term Evolution (LTE) radio access technology, current sidelink mode 4 operation involves the transmitting user equipment (Tx UE) autonomously selecting radio resources in a sidelink resource pool for packet data transmission. In such an operation, multiple UEs compete for the same set of resources without any central control. Although most UEs in current sidelink mode 4 operation need to perform resource sensing before selecting and reselecting resources for transmission, when two UEs select the same resources, there is still no guarantee that the selected resources from one UE will not collide with transmissions from the other UE. Furthermore, even when two UEs select the same resource for transmission, the two UEs cannot detect such Tx collision because the two UEs cannot simultaneously transmit and receive on the same carrier due to half-duplex restrictions. Further, there is no mechanism for reporting the occurrence of collision with UE feedback, such as from a third UE.

In future fifth generation new air interface (5G-NR) systems, there is an even increasing demand for emergency transmission of data over sidelink/PC 5 interfaces to support public safety, road safety and mission critical communications. The data requirements for end-to-end communication become very short in latency, while at the same time these applications and use cases also require more reliable messaging without errors. As an example of completely unmanned operation (e.g., autonomous driving), fast and reliable communication between closed vehicles is critical for safe driving and steering control on roads (maneuver). These requirements are difficult to meet with existing LTE sidelink techniques and cannot be guaranteed to be met due to the resource selection mechanism as described before. Therefore, this has led to a need to support ultra-reliable low-latency communication (URLLC) in next generation wireless communication systems.

Disclosure of Invention

An object of the present disclosure is to propose a User Equipment (UE) and a wireless communication method thereof for providing a resource preemption and reservation mechanism for side link data Transport Block (TBs) transmission.

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 wirelessly communicate directly with at least one second user equipment over a sidelink interface, monitor and read at least one sidelink resource used by the at least one second user equipment, determine a plurality of first sidelink resources available for transmission of a plurality of preemption signals and a plurality of second sidelink resources available for transmission of a plurality of sidelink data Transport Blocks (TBs), perform a plurality of preemption procedures by transmitting the preemption signals to reserve the second sidelink resources, and transmit the sidelink data TBs using the reserved second sidelink resources and reserve a plurality of identical frequency resources in a current transmission using the second sidelink resources for a subsequent transmission.

According to an embodiment in combination with the first aspect of the disclosure, the sidelink resources, the first sidelink resource and the second sidelink resource are at least one of short transmission time interval (sTTI) sidelink resources and normal transmission time interval (nTTI) sidelink resources.

According to an embodiment in combination with the first aspect of the disclosure, the second sidelink resource is an empty sidelink resource before performing the preemption procedure, and is not used by the at least one second user equipment.

According to an embodiment in combination with the first aspect of the disclosure, each of the sTTI side link resources and the nti side link resources comprises a Guard Period (GP)/Automatic Gain Control (AGC) region, a control region for transmitting a physical side link control channel (PSCCH) carrying side link control information (SCI), and a data region for transmitting at least one of a preemption signal and a physical side link shared channel (PSCCH) for transmitting side link data TBs.

According to an embodiment incorporating the first aspect of the present disclosure, the GP/AGC region has a length of 1 symbol and the data region has a length of at least 3 symbols.

According to an embodiment in combination with the first aspect of the disclosure, the processor is further configured to sense a GP/AGC region of the first side link resources and/or read a control region of the first side link resources to determine a true availability of the first side link resources for transmission of the preemption signal.

According to an embodiment in combination with the first aspect of the disclosure, the processor is further configured to transmit the preemption signal in a data region of the first side link resource.

According to an embodiment in combination with the first aspect of the disclosure, the processor is further configured to randomly select with the same probability two symbols of a total number of symbols in the data region of the first side link resource for transmission of the pair of preemption signals.

According to an embodiment incorporating the first aspect of the present disclosure, each preemption signal has a length of 1 symbol and retains the same information as the information carried by the other preemption signal.

According to an embodiment in combination with the first aspect of the disclosure, the processor is further configured to transmit, in the preemption process, information content including a time offset parameter indicating a time interval according to a number of sidelink resources or milliseconds for booking the second sidelink resource, a proximity services (ProSe) per packet priority (PPPP) level, a user equipment source identification and/or a destination identification.

According to an embodiment in combination with the first aspect of the disclosure, the processor is further configured to reserve the same frequency resources by indicating a time offset in the SCI of the second sidelink resource.

According to an embodiment in combination with the first aspect of the present disclosure, the processor is further configured to monitor and read a plurality of second preemption signals transmitted by at least one second user equipment, the processor being further configured to detect a second preemption signal on the first side link resource that does not overlap with said preemption signals.

According to an embodiment in combination with the first aspect of the disclosure, the processor is further configured to detect a second preemption signal in the time domain with a time interval to the preemption signal.

According to an embodiment in combination with the first aspect of the present disclosure, the processor is further configured to monitor and read a plurality of second preemption signals transmitted by at least one second user equipment, to detect preemption signals and second preemption signals in different data regions of the first side link resource, to detect preemption signals and second preemption signals with the same time offset over a time period, and to independently and randomly select with equal probability to the at least one second user equipment whether to continue using the second side link resource after the same time period, or to relinquish the second side link resource and restart the same preemption procedure in a different empty side link resource.

According to an embodiment in combination with the first aspect of the disclosure, the processor is further configured to monitor and read a plurality of second preemption signals transmitted by at least one second user equipment, detect preemption signals having a first PPPP level and second preemption signals having a second PPPP level greater than the first PPPP level in different data regions of the first sidelink resource, detect preemption signals and second preemption signals having a same time offset over a period of time, the processor is further configured to relinquish the second sidelink resource and restart the same preemption procedure in a different empty sidelink resource.

According to an embodiment in combination with the first aspect of the disclosure, the processor is further configured to monitor and read a plurality of second preemption signals transmitted by at least one second user equipment, detect preemption signals having a first PPPP level and second preemption signals having a second PPPP level less than the first PPPP level in different data regions of the first sidelink resource, detect preemption signals and second preemption signals having a same time offset over a period of time, the processor is further configured to continue using the second sidelink resource after the same period of time.

According to an embodiment in combination with the first aspect of the present disclosure, the processor is further configured to monitor and read a plurality of second preemption signals transmitted by at least one second user equipment, detect a second preemption signal on the first side link resource, detect a second preemption signal in the time domain having a time interval with the preemption signal, detect a portion of the second preemption signal that overlaps with a portion of the preemption signal, and detect another portion of the second preemption signal that does not overlap with another portion of the preemption signal.

According to an embodiment in combination with the first aspect of the disclosure, the number of preemption procedures is equal to the number of reservations of the second sidelink resource.

According to an embodiment in combination with the first aspect of the disclosure, the processor is further configured to transmit the data TB by an initial transmission and at least one retransmission.

According to an embodiment in combination with the first aspect of the disclosure, the processor is further configured to transmit the data TB and repeatedly reserve the same frequency resources.

In a second aspect of the disclosure, a method of wireless communication of a user equipment comprises: the method includes wirelessly communicating directly with at least one second user equipment over a sidelink interface, monitoring and reading at least one sidelink resource used by the at least one second user equipment, determining a plurality of first sidelink resources available for transmission of a plurality of preemption signals and a plurality of second sidelink resources available for transmission of a plurality of sidelink data Transport Blocks (TBs), performing a plurality of preemption procedures to reserve the second sidelink resources by transmitting the preemption signals, and transmitting the sidelink data TBs using the reserved second sidelink resources and reserving a plurality of identical frequency resources for subsequent transmissions using the second sidelink resources in a current transmission.

According to another embodiment in combination with the second aspect of the disclosure, the sidelink resources, the first sidelink resource and the second sidelink resource are at least one of short transmission time interval (sTTI) sidelink resources and normal transmission time interval (nTTI) sidelink resources.

According to a further embodiment in combination with the second aspect of the disclosure, the second sidelink resource is an empty sidelink resource before performing the preemption procedure, and is not used by the at least one second user equipment.

According to another embodiment in combination with the second aspect of the disclosure, each of the sTTI side link resources and the nti side link resources comprises a Guard Period (GP)/Automatic Gain Control (AGC) region, a control region for transmitting a physical side link control channel (PSCCH) carrying side link control information (SCI), and a data region for transmitting at least one of a preemption signal and a physical side link shared channel (PSCCH) for transmitting side link data TBs.

According to another embodiment incorporating the second aspect of the present disclosure, the GP/AGC region has a length of 1 symbol and the data region has a length of at least 3 symbols.

According to another embodiment in combination with the second aspect of the disclosure, the method further comprises sensing a GP/AGC region of the first side link resources and/or reading a control region of the first side link resources to determine a true availability of the first side link resources for transmission of the preemption signal.

According to a further embodiment in combination with the second aspect of the disclosure, the method further comprises transmitting the preemption signal in a data region of the first side link resources.

According to another embodiment in combination with the second aspect of the disclosure, the method further comprises: two symbols of the total number of symbols in the data region of the first side link resource are randomly selected with the same probability for transmission of a pair of preemption signals.

According to a further embodiment in combination with the second aspect of the present disclosure, each preemption signal has a length of 1 symbol and retains the same information as the information carried by the other preemption signal.

According to a further embodiment in combination with the second aspect of the disclosure, the method further comprises transmitting an information content during the preemption, the information content comprising a time offset parameter indicating a time interval according to a number of sidelink resources or milliseconds for booking the second sidelink resource, a proximity services per packet priority (PPPP) level, a user equipment source identification and/or a destination identification.

According to another embodiment in combination with the second aspect of the disclosure, the method further comprises reserving the same frequency resources by indicating a time offset in the SCI of the second sidelink resource.

According to another embodiment in combination with the second aspect of the disclosure, the method further comprises: a plurality of second preemption signals transmitted by at least one second user equipment are monitored and read, the processor being further configured to detect second preemption signals on the first side link resources that do not overlap with said preemption signals.

According to another embodiment in combination with the second aspect of the disclosure, the method further comprises: a second preemption signal is detected in the time domain with a time interval to the preemption signal.

According to another embodiment in combination with the second aspect of the disclosure, the method further comprises: the processor is further configured to independently and randomly select with equal probability to the at least one second user device whether to continue using the second side link resource after the same time period, or to relinquish the second side link resource and restart the same preemption procedure in a different empty side link resource.

According to another embodiment in combination with the second aspect of the disclosure, the method further comprises: monitoring and reading a plurality of second preemption signals transmitted by at least one second user equipment, detecting preemption signals at a first PPPP level and second preemption signals at a second PPPP level greater than the first PPPP level in different data regions of the first sidelink resource, detecting preemption signals and second preemption signals at the same time offset over a time period, the processor further configured to relinquish the second sidelink resource and resume the same preemption procedure in a different empty sidelink resource.

According to another embodiment in combination with the second aspect of the disclosure, the method further comprises monitoring and reading a plurality of second preemption signals transmitted by at least one second user equipment, detecting preemption signals at a first PPPP level and second preemption signals at a second PPPP level less than the first PPPP level in different data regions of the first sidelink resource, detecting preemption signals and second preemption signals at the same time offset over a time period, the processor further configured to continue using the second sidelink resource after the same time period.

According to another embodiment in combination with the second aspect of the disclosure, the method further comprises: the method includes monitoring and reading a plurality of second preemption signals transmitted by at least one second user equipment, detecting the second preemption signals on the first sidelink resource, detecting the second preemption signals in the time domain with a time interval to the preemption signals, detecting a portion of the second preemption signals that overlaps with a portion of the preemption signals, and detecting another portion of the second preemption signals that does not overlap with another portion of the preemption signals.

According to a further embodiment in combination with the second aspect of the disclosure, the number of preemption procedures is equal to the number of reservations of the second sidelink resource.

According to another embodiment in combination with the second aspect of the disclosure, the method further comprises transmitting the data TB by an initial transmission and at least one retransmission.

According to another embodiment in combination with the second aspect of the disclosure, the method further comprises: the data TB is transmitted and the same frequency resources are repeatedly reserved.

In embodiments of the present disclosure, a user equipment and a wireless communication method thereof provide a resource preemption and reservation mechanism for sidelink data Transmission Block (TB) transmissions in a fifth generation new air interface (5G-NR) to reduce or even prevent transmission (Tx) collisions from multiple transmitting UEs. In addition, in this embodiment, two contention resolution techniques are also presented to resolve the problem that two UEs attempt to preempt the same sidelink resource for transmission. The user equipment and the wireless communication method thereof in embodiments also provide fast and reliable data transmission for NR side link communication through resource preemption, reservation and/or contention resolution.

Drawings

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

Fig. 1 is a block diagram of a user equipment for wireless communication with another user equipment in accordance with an embodiment of the present disclosure.

Fig. 2 is a diagram of a structure of a sidelink resource pool, according to an embodiment of the present disclosure.

Fig. 3 is a diagram of a structure of a sidelink resource pool, according to an embodiment of the present disclosure.

Fig. 4 is a scenario in which preemption signals are transmitted by different user devices in the same data region in accordance with an embodiment of the present disclosure.

Fig. 5 is a scenario in which preemption signals are transmitted by different user devices in the same data region in accordance with an embodiment of the present disclosure.

Fig. 6 is a scenario in which preemption signals are transmitted by different user devices in the same data region in accordance with an embodiment of the present disclosure.

Fig. 7 is a scenario of vehicle-to-ambient (V2X) communication, according to an embodiment of the present disclosure.

Fig. 8 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

Technical contents, structural features, objects of implementation, and effects in the embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. In particular, the terminology used in the embodiments of the present invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

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 wirelessly communicate directly with at least one second user equipment 200 over a sidelink interface, such as a PC5 interface, monitor and read at least one sidelink resource 311 used by the at least one second user equipment 200 (e.g., process 310), determine a plurality of first sidelink resources available for transmission of a plurality of preemption signals 322, 323, 324 and 325 and a plurality of second

sidelink resources

332, 333, 334 and 335 available for transmission of a plurality of sidelink data Transport Blocks (TBs), perform the plurality of preemption processes 320 by transmitting preemption signals 322, 323, 324 and 325 for reservation of second

sidelink resources

332, 333, 334 and 335, and transmit sidelink data TBs using the reserved

second sidelink resources

332, 333, 334 and 335, and reserve a plurality of identical frequency resources in a current transmission using the

second sidelink resources

332, 333, 334 and 335, for subsequent transmission.

In some embodiments, the sidelink resources 311, the first and

second sidelink resources

332, 333, 334, and 335 are at least one of short transmission time interval (sTTI) sidelink resources and normal transmission time interval (nTTI) sidelink resources. The

second sidelink resources

332, 333, 334 and 335 are empty sidelink resources before the preemption procedure 320 is performed and are not used by the at least one second user equipment 200.

In detail, the user equipment 100 may be a user equipment for transmitting signals, and the user equipment 200 may also be a user equipment for transmitting signals. In some embodiments, communication between user equipment 100 and user equipment 200 over a sidelink interface, such as a PC5 interface, may be based on Long Term Evolution (LTE) sidelink technology and/or a fifth generation new air interface (5G-NR) radio access technology developed under the third generation partnership project (3 GPP).

Further, in some embodiments, the resource selection as part of the nTTI or sTTI transmission process from the user equipment 100 includes performing a process 310 of monitoring at least one sidelink resource 311 and reading the nTTI message or the sTTI message using the at least one sidelink resource 311, performing a process 320 of pre-empting

second sidelink resources

332, 333, 334, and 335 for the nTTI transmission or the sTTI transmission, and performing a process 330 of periodic data transmission (Tx) and reservation of next sidelink resources.

In detail, the user equipment 100 has been authorized to use direct communication services, such as device-to-device (D2D) or proximity services (proximity services) required by the vehicle to the outside world (V2X), to receive and monitor data packets being transmitted from the sidelink resource 311 from other user equipment, such as the user equipment 200. Based on decoding the sidelink control information using the at least one sidelink resource 311 of the user equipment 200, the user equipment 100 obtains knowledge about resource usage and reservation details of the next transmission.

Upon arrival of a data packet, such as process 321, process 321 triggers the user equipment 100 to start the preemption process 320 by transmitting a plurality of preemption signals 322, 323, 324, and 325, which signals 322, 323, 324, and 325 are used to subscribe to a plurality of sidelink nTTI or sTTI resources, such as

second sidelink resources

332, 333, 334, and 335 required for transmission of a data packet TB. The number of preemption procedures 320 may be equal to the number of second

side link resources

332, 333, 334, and 335, the second

side link resources

332, 333, 334, and 335 being used to transmit the initial transmission of the nTTI or sTTI data TB and all related repetitions/retransmissions.

For the example shown in

procedures

320 and 330, there are four preemption procedures initiated by the user equipment 100 for reserving four

second sidelink resources

332, 333, 334, and 335, e.g., four nTTI or sTTI resource units, to carry all necessary initial transmissions and retransmissions of the data TB during the Tx and reservation procedures 330. For a periodic nTTI or sTTI data packet TB (e.g., procedures 341 and 351) with an arrival rate of once every X milliseconds (ms), the user equipment 100 may reserve the same frequency resources in the current TB transmission 330 for the subsequent TB transmission 340 in the next X ms. The user equipment 100 may repeat the same reservation procedure 350 for subsequent Xms and so on.

In an embodiment of the present disclosure, the user equipment 100 provides a resource preemption and reservation mechanism for sidelink data Transmission Block (TB) transmission in a fifth generation new air interface (5G-NR) system to reduce or even prevent transmission (Tx) collisions from multiple transmitting UEs.

Fig. 3 illustrates details of sidelink resource pools 400 for nTTI or sTTI transmissions, as well as resource reservation during the preemption phase and resource reservation during the data Tx phase, in some embodiments. A sidelink resource pool 400, such as an nTTI or sTTI resource pool, is divided into a plurality of resource elements 401 for nTTI or sTTI transmissions, each of the nTTI or sTTI resource elements including a Guard Period (GP)/Automatic Gain Control (AGC) region 402 of 1 symbol length, a control region 403 for transmitting a Physical Sidelink Control Channel (PSCCH) carrying Sidelink Control Information (SCI), and a data region 404, the data region 404 being usable for transmitting at least one of a preemption signal 406 and a physical sidelink shared channel (PSCCH) for transmitting sidelink data TBs. The length of the data region 404 may be at least 3 symbols long.

During the preemption phase, the preemption process involves determining that the nTTI or sTTI resource elements are not used by the user equipment 200 and transmitting a pair of preemption signals to indicate the user equipment's 200 intention to use the frequency resource elements after a certain time offset. In detail, determining available nTTI or sTTI resources within a data packet arrival interval is performed by the processor 104. Based on the post-monitoring and reading of the control and scheduling information for the nTTI or sTTI in process 310, the user equipment 100 initially identifies all nTTI or sTTI resource elements 405 that have been reserved for transmission in the current data packet arrival interval Xms in

processes

320 and 330.

In other nTTI or sTTI resource units, the processor 104 of the user equipment 100 performs sensing of GP/AGC symbols of the GP/AGC region 402 and/or reading of the PSCCH of the control region 403 to further determine the true availability of the first side link resources for transmission of the preemption signal 406. If empty/unused nTTI or sTTI resource units are found, the user equipment 100 may select the found resource units and transmit a paired preemption signal 406 in the data region 404 of the first side link resources using the found resource units.

The resource reservation of the preemption process is performed by the processor 104. Two of the total number of symbols in the data region 404 used to transmit the pair of preemption signals 406 are randomly selected with equal probability. In the pair of preemption signals 406 during preemption, each signal of preemption signal 406 may be 1 symbol in length and hold the same information as the information carried by the other signal of preemption signal 406.

The processor 104 is further configured to transmit the information content during the preemption. The information content may include at least a time interval 407 indicating to an expected nTTI or sTTI resource element 408 for the subscription, a proximity service per packet priority (PPPP) level, a user equipment source Identification (ID), and/or a destination ID, which time interval 407 may be in accordance with the number of nTTI or sTTI resource elements or milliseconds. The user device 100 repeats the same process until all preemption processes are complete.

In detail, the transmission of the nTTI or sTTI data TB and the reservation of the next resource are performed by the processor 104. The user equipment 100 uses the reserved resource unit 408 (e.g., the second

side link resources

332, 333, 334, 335 in fig. 2) for transmission of the nTTI or sTTI data packet TB arriving from an upper layer (e.g., a Medium Access Control (MAC) layer), and at the same time reserves the same frequency resources after Xms for transmission of the next data packet TB from the upper layer in the procedure 409. The reservation of procedure 409 is performed by indicating a time offset to the next reserved frequency resource in the SCI transmitted in the PSCCH.

Fig. 4 to 6 illustrate different scenarios in which pairs of preemption signals are transmitted by different UEs, such as the first user equipment 100 and the second user equipment 200, in the same data region of an nTTI or sTTI resource unit in some embodiments. In detail, fig. 4 shows that in some embodiments the first user device 100 transmits a preemption signal pair in

symbols

512 and 514 and the second user device 200 transmits a preemption signal pair in

symbols

511 and 513. Since the preemption signal pairs for the first and

second user equipment

100, 200 do not overlap in the data region of the first side link resource, the first and

second user equipment

100, 200 will be able to listen to each other's preemption indications. Furthermore, since the indicated time intervals of the first user equipment 100 and the second user equipment 200 are directed to different nTTI or sTTI resource elements in the time domain, there will be no collisions or collisions when transmitting data packets. Thus, the preemption process is considered successful for both the first user device 100 and the second user device 200.

Fig. 5 shows that in some embodiments the first user device 100 transmits a preemption signal pair in

symbols

522 and 524 and the second user device 200 transmits a preemption signal pair in

symbols

521 and 523. Both the user equipment 100 and the second user equipment 200 transmit the preemption signal pair in different data region symbols of the first side link resource and detect that both indicate the same Y ms time offset. In this case, in order to avoid data packet transmission collision between the first user equipment 100 and the second user equipment 200, contention resolution will be necessary. One of the following two competing solutions may be used. In contention resolution 1, both the first user equipment 100 and the second user equipment 200 independently and randomly choose with equal probability whether to continue using the indicated frequency resource units after Yms or to relinquish the indicated resources and restart the same preemption procedure in different empty nTTI or sTTI resources.

In contention resolution 2, when the PPPP level of the current data packet is also included as part of the preemption indication, the user equipment with the lower PPPP level (in this case the first user equipment 100) will relinquish the indicated resources and restart the same preemption procedure in a different empty nTTI or sTTI resource. The user equipment with the higher PPPP level, in this case the second user equipment 200, will continue to use the indicated frequency resource units after Y ms.

Fig. 6 shows that in some embodiments the first user equipment 100 transmits a preemption signal pair in

symbols

532 and 533 and the second user equipment 200 transmits a preemption signal pair in

symbols

531 and 532. In this case both the first user equipment 100 and the second user equipment 200 have overlapping symbols 532 in the data region of the first side link resource, but are still able to retrieve the preemption signal for the first user equipment 100 for each other in 531 and the preemption signal for the second user equipment 200 for each other in 533. Since the indicated time offsets are different, there will be no collisions or collisions in the transmission of the data packets. Thus, the resource preemption procedure is considered successful for both the first user device 100 and the second user device 200.

In some embodiments,

memories

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

Processors

104 and 204 may each include an Application Specific Integrated Circuit (ASIC), other chipset, logic circuit, and/or data processing device. The

processors

104 and 204 may each also include baseband circuitry for processing 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

memory

102 and 202 may be implemented within the

processors

104 and 204 or external to the

processors

104 and 204, in which case the modules may be communicatively coupled to the

processors

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

Fig. 7 illustrates that in some embodiments, communications between the user equipment 100 and the user equipment 200 involve vehicle-to-ambient (V2X) communications in accordance with Long Term Evolution (LTE) sidelink technology) and/or 5G-NR radio access technology developed under the third generation partnership project (3GPP), the vehicle-to-ambient (V2X) communications including vehicle-to-vehicle (V2V), vehicle-to-pedestrian (V2P), and vehicle-to-ambient (V2X) communications of the infrastructure/network (V2I/N). The

user devices

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

Fig. 8 is an illustration of a wireless communication methodology 600 in accordance with the present disclosure in terms of operation of a user device 100 for transmitting signals. The method 600 comprises: at block 602, wirelessly communicating directly with at least one second user equipment 200 over a sidelink interface, at block 604, monitoring and reading at least one sidelink resource used by the at least one second user equipment 200, at block 606, determining a plurality of first sidelink resources available for transmission of a plurality of preemption signals and a plurality of second sidelink resources available for transmission of a plurality of sidelink data Transport Blocks (TBs), at block 608, performing a plurality of preemption procedures by transmission of preemption signals to reserve the second sidelink resources, and at block 610, transmitting the sidelink data TBs using the reserved second sidelink resources and reserving the same plurality of frequency resources in a current transmission for subsequent transmissions.

In some embodiments, the method 600 further comprises sensing a GP/AGC region of the first side link resources and/or reading a control region of the first side link resources to determine a true availability of the first side link resources for transmission of the preemption signal. The method 600 further comprises: the preemption signal is transmitted in a data region of the first side link resource. The method 600 further comprises: two symbols of the total number of symbols in the data region of the first side link resource are randomly selected with the same probability for transmission of a pair of preemption signals. The method 600 further comprises: the information content is transferred during the preemption. The information content includes a time offset parameter indicating a time interval according to a number of sidelink resources or milliseconds for subscribing to the second sidelink resource, a proximity services per packet priority (PPPP) level, a user equipment source identification, and/or a destination identification.

In some embodiments, method 600 includes: the same frequency resources are reserved by indicating a time offset in the SCI of the second sidelink resource. The method further comprises the following steps: monitoring and reading a plurality of second preemption signals transmitted by at least one second user equipment 200 and detecting second preemption signals on the first side link resources that do not overlap with said preemption signals. The method 600 further comprises: a second preemption signal is detected in the time domain with a time interval to the preemption signal.

In some embodiments, method 600 includes: monitoring and reading a plurality of second preemption signals transmitted by at least one second user equipment 200, detecting preemption signals and second preemption signals in different data regions of the first sidelink resource, detecting preemption signals and second preemption signals having the same time offset within a time period, independently and randomly selecting with equal probability to the at least one second user equipment 200 whether to continue using the second sidelink resource after the same time period, or relinquishing the second sidelink resource and restarting the same preemption procedure in a different empty sidelink resource.

In some embodiments, method 600 includes: monitoring and reading a plurality of second preemption signals transmitted by at least one second user equipment 200, detecting preemption signals at a first PPPP level and second preemption signals at a second PPPP level greater than the first PPPP level in different data regions of the first sidelink resource, detecting preemption signals and second preemption signals at the same time offset over a time period, relinquishing the second sidelink resource and restarting the same preemption process in a different empty sidelink resource.

In some embodiments, method 600 includes: monitoring and reading a plurality of second preemption signals transmitted by at least one second user equipment 200, detecting preemption signals at a first PPPP level and second preemption signals at a second PPPP level less than the first PPPP level in different data regions of the first sidelink resource, detecting preemption signals and second preemption signals at the same time offset over a time period, and continuing to use the second sidelink resource after the same time period.

In some embodiments, method 600 includes: the method includes monitoring and reading a plurality of second preemption signals transmitted by at least one second user equipment 200, detecting the second preemption signals on the first sidelink resource, detecting the second preemption signals in the time domain with a time interval to the preemption signals, detecting a portion of the second preemption signals that overlaps with a portion of the preemption signals, and detecting another portion of the second preemption signals that does not overlap with another portion of the preemption signals.

In some embodiments, method 600 includes transmitting a data TB via an initial transmission and at least one retransmission. The method 600 further comprises transmitting the data TB and repeatedly reserving the same frequency resources.

It will be understood by those of ordinary skill in the art that each of the units, algorithms, and steps described and disclosed in the embodiments of the present disclosure is implemented using electronic hardware or a combination of software for computers and electronic hardware. Whether these functions are executed in hardware or software depends on the application conditions and design requirements 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. It will be appreciated by persons skilled in the art that, since the operation of the above-described systems, devices and units is substantially the same, reference may be made to the operation of the systems, devices and units in the above-described embodiments. For convenience of description 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 illustrative. The partitioning of cells is based solely on logic functions, and other partitions exist in the implementation. It is possible that multiple units or components may be combined or may be integrated into another system. It is also possible to omit or skip some features. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The elements described as separate components may or may not be physically separate. The unit for displaying may or may not be a physical unit, i.e. may be located in one place, or may also be distributed over a plurality of network units. Some or all of the units may be used according to the purpose of the embodiments.

In addition, functional units in the embodiments may be integrated into one processing unit, may be physically independent, or may be integrated into one processing unit by two or more units.

If the software functional units are implemented and sold or used as a stand-alone product, they may be stored in a computer readable storage medium. Based on such understanding, the technical solutions proposed by the present disclosure can be implemented in the form of software products in nature or in part. Or a part of the technical solution that is advantageous for the prior art may be implemented in the form of a software product. The software product in the computer is stored in a storage medium and includes a plurality of commands for a computing device (e.g., a personal computer, server, or network device) to execute all or part of the steps disclosed in the 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 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 and configured to:

wirelessly communicating directly with at least one second user equipment through a sidelink interface;

monitoring and reading at least one sidelink resource used by the at least one second user equipment;

determining a plurality of first side link resources available for transmission of a plurality of preemption signals and a plurality of second side link resources available for transmission of a plurality of side link data transport blocks, TBs;

performing a plurality of preemption procedures by transmitting preemption signals to reserve second side link resources; and

transmitting side-link data TB using the reserved second side-link resources, and reserving a plurality of same frequency resources in the current transmission, for subsequent transmissions,

wherein the processor is further configured to monitor and read a plurality of second preemption signals transmitted by the at least one second user equipment, detect preemption signals and second preemption signals in different data regions of a first side link resource, detect preemption signals and second preemption signals having a same time offset over a time period, and independently and randomly select, with equal probability to the at least one second user equipment, whether to continue using the second side link resource after the same time period, or to relinquish the second side link resource and resume the same preemption process in a different empty side link resource; or

Wherein the processor is further configured to monitor and read a plurality of second preemption signals transmitted by the at least one second user equipment, detect preemption signals at a first PPPP level and second preemption signals at a second PPPP level greater than the first PPPP level in different data regions of a first sidelink resource, detect preemption signals and second preemption signals having a same time offset over a time period, and the processor is further configured to relinquish the second sidelink resource and resume a same preemption procedure in a different empty sidelink resource; or

Wherein the processor is further configured to monitor and read a plurality of second preemption signals transmitted by the at least one second user equipment, detect preemption signals at a first PPPP level and second preemption signals at a second PPPP level less than the first PPPP level in different data regions of the first sidelink resource, detect preemption signals and second preemption signals having a same time offset within a time period, and continue to use the second sidelink resource after the same time period.

2. The user equipment of claim 1, wherein the side link resources, first side link resources, and second side link resources are at least one of short transmission time interval (sTTI) side link resources and normal transmission time interval (nTTI) side link resources.

3. The user equipment of claim 1, wherein the second sidelink resource is an empty sidelink resource prior to performing the preemption procedure and is not used by the at least one second user equipment.

4. The user equipment of claim 2, wherein each of the sTTI side link resources and the nti side link resources comprises a guard period GP/automatic gain control, AGC, region, a control region for transmission of a physical side link control channel, PSCCH, carrying side link control information, SCI, and a data region for transmission of at least one of a preemption signal and a physical side link shared channel, PSCCH, for transmission of side link data, TB.

5. The user equipment of claim 4, wherein the GP/AGC region has a length of 1 symbol and the data region has a length of at least 3 symbols.

6. The user equipment of claim 4, wherein the processor is further configured to sense a GP/AGC region of the first side link resources and/or read a control region of the first side link resources to determine a true availability of the first side link resources for transmission of the preemption signal.

7. The user equipment of claim 6, wherein the processor is further configured to transmit a preemption signal in a data region of the first sidelink resource.

8. The user equipment of claim 5, wherein the processor is further configured to randomly select with the same probability two symbols of a total number of symbols in a data region of the first side link resource for transmission of a pair of preemption signals.

9. The user equipment of claim 8 wherein each preemption signal has a length of 1 symbol and retains the same information as carried by the other preemption signal.

10. The user equipment of claim 8, wherein the processor is further configured to transmit information content during the preemption, the information content including a time offset parameter indicating a time interval based on a number of sidelink resources or a number of milliseconds used to reserve a second sidelink resource, a proximity services per packet priority (PPPP) level, a user equipment source identification, and/or a destination identification.

11. The user equipment of claim 4, wherein the processor is further configured to reserve the same frequency resources by indicating a time offset in the SCI of the second sidelink resource.

12. The user device of claim 1, wherein the processor is further configured to monitor and read a plurality of second preemption signals transmitted by the at least one second user device, and the processor is further configured to detect a second preemption signal on the first side link resource that does not overlap with the preemption signal.

13. The user equipment of claim 12, wherein the processor is further configured to detect a second preemption signal in the time domain with a time interval to the preemption signal.

14. The user equipment of claim 1, wherein the processor is further configured to monitor and read a plurality of second preemption signals transmitted by the at least one second user equipment, detect a second preemption signal on the first sidelink resource, detect a second preemption signal having a time interval in the time domain with the preemption signal, detect a portion of the second preemption signal that overlaps with a portion of the preemption signal, and detect another portion of the second preemption signal that does not overlap with another portion of the preemption signal.

15. The user equipment of claim 1, wherein the number of preemption procedures is equal to the number of reservations for a second sidelink resource.

16. The user equipment of claim 1, wherein the processor is further configured to transmit a data TB via an initial transmission and at least one retransmission.

17. The user equipment of claim 1, wherein the processor is further configured to transmit data TBs and repeatedly reserve the same frequency resources.

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

performing a plurality of preemption procedures for reserving second sidelink resources by transmitting preemption signals; and

wherein the method further comprises:

monitoring and reading a plurality of second preemption signals transmitted by the at least one second user equipment, detecting preemption signals and second preemption signals in different data regions of a first sidelink resource, detecting preemption signals and second preemption signals having the same time offset within a time period, and independently and randomly selecting whether to continue using the second sidelink resource after the same time period with a probability equal to that of the at least one second user equipment, or abandoning the second sidelink resource and restarting the same preemption process in different empty sidelink resources; or

Monitoring and reading a plurality of second preemption signals transmitted by said at least one second user equipment, detecting preemption signals at a first PPPP level and second preemption signals at a second PPPP level greater than the first PPPP level in different data regions of the first sidelink resource, detecting preemption signals and second preemption signals having the same time offset over a time period, relinquishing said second sidelink resource and resuming the same preemption procedure in a different empty sidelink resource; or

The method comprises monitoring and reading a plurality of second preemption signals transmitted by the at least one second user equipment, detecting preemption signals at a first PPPP level and second preemption signals at a second PPPP level less than the first PPPP level in different data regions of the first sidelink resource, detecting preemption signals and second preemption signals at the same time offset over a time period, and continuing to use the second sidelink resource after the same time period.

19. The method of claim 18, wherein the side link resources, first side link resources, and second side link resources are at least one of short transmission time interval sTTI side link resources and normal transmission time interval sTTI side link resources.

20. The method of claim 18, wherein the second sidelink resource is an empty sidelink resource prior to performing the preemption procedure and is not used by at least one second user equipment.

21. The method of claim 19, wherein each of the sTTI side link resources and the sTTI side link resources comprises a guard period GP/automatic gain control, AGC, region, a control region for transmission of a physical side link control channel, PSCCH, carrying side link control information, SCI, and a data region for transmission of at least one of a preemption signal and a physical side link shared channel, PSCCH, for transmission of side link data, TB.

22. The method of claim 21, wherein the GP/AGC region has a length of 1 symbol and the data region has a length of at least 3 symbols.

23. The method of claim 21, further comprising: the GP/AGC region of the first side link resource is sensed and/or the control region of the first side link resource is read to determine the true availability of the first side link resource for transmission of the preemption signal.

24. The method of claim 23, further comprising: the preemption signal is transmitted in a data region of the first side link resource.

25. The method of claim 22, further comprising: two symbols of the total number of symbols in the data region of the first side link resource are randomly selected with the same probability for transmission of a pair of preemption signals.

26. A method according to claim 25, wherein each preemption signal has a length of 1 symbol and retains the same information as that carried by the other preemption signal.

27. The method of claim 25, further comprising: transmitting information content during the preemption, the information content including a time offset parameter indicating a time interval based on a number of sidelink resources or milliseconds for booking a second sidelink resource, a proximity services per packet priority PPPP level, a user equipment source identification, and/or a destination identification.

28. The method of claim 21, further comprising: the same frequency resources are reserved by indicating a time offset in the SCI of the second sidelink resource.

29. The method of claim 18, further comprising: monitoring and reading a plurality of second preemption signals transmitted by said at least one second user equipment and detecting second preemption signals on the first side link resources that do not overlap with said preemption signals.

30. The method of claim 29, further comprising: a second preemption signal is detected in the time domain with a time interval to said preemption signal.

31. The method of claim 18, further comprising: the method comprises monitoring and reading a plurality of second preemption signals transmitted by the at least one second user equipment, detecting the second preemption signals on the first sidelink resource, detecting the second preemption signals having a time interval in the time domain with the preemption signals, detecting a portion of the second preemption signals that overlaps with a portion of the preemption signals, and detecting another portion of the second preemption signals that does not overlap with another portion of the preemption signals.

32. The method of claim 18, wherein the number of preemption procedures is equal to the number of reservations for the second sidelink resource.

33. The method of claim 18, further comprising: the data TB is transmitted through an initial transmission and at least one retransmission.

34. The method of claim 18, further comprising: the data TB is transmitted and the same frequency resources are repeatedly reserved.