CN117158073A

CN117158073A - Partial awareness method and apparatus for resource selection in side-link communications

Info

Publication number: CN117158073A
Application number: CN202280020570.XA
Authority: CN
Inventors: 岳国森; 布莱恩·克莱森; 维普尔·德赛; 肖维民
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-04-05
Filing date: 2022-04-04
Publication date: 2023-12-01

Abstract

A system and method for operating a User Equipment (UE) for side-link data transmission in a wireless communication system includes: the UE determining a candidate resource region for data transmission, the candidate resource region indicating a candidate resource slot for the data transmission; sensing by using sensing opportunities to determine available resources from the candidate resource region, wherein the sensing opportunities are determined according to the candidate resource region, the sensing period and the maximum sensing opportunity number; the UE selects resources from the available resources; the UE transmits data on the selected resources.

Description

Partial awareness method and apparatus for resource selection in side-link communications

Priority claims and cross-references

The present patent application claims priority from U.S. provisional application No. 63171006, titled "partial awareness method and apparatus for resource selection in side-uplink communications (Method and Apparatus of Partial Sensing for Resource Selection in Sidelink Communications)" and U.S. provisional application No. 63275807, titled "method and apparatus for partial awareness and inter-UE coordination of resource selection in side-uplink communications (Method and Apparatus of Partial Sensing and Inter-UE Coordination for Resource Selection in Sidelink Communications)" filed on 4/2021, the entire contents of which are incorporated herein by reference.

Technical Field

The present disclosure relates generally to managing resource allocation in a network, and in particular embodiments, to techniques and mechanisms for side-link communications.

Background

Several important functions of the fifth generation (5G) new air interface access technology (NR) have been developed and standardized by the third generation partnership project (third generation partnership project,3 GPP). In Release-16, a work item for NR vehicle-to-everything (V2X) wireless communication was completed with the objective of providing a 5G compatible high speed reliable connection for vehicle communication. The work item provides a basis for NR side uplink communication for applications such as security systems and autopilot. High data rates, low latency, and high reliability are some of the key areas being studied and standardized. In Release-17, a sidelink enhancement work item is approved to further enhance the ability and performance of sidelink communications. One of the important goals of this work item is to introduce a UE coordination mechanism in which a UE shares resources for other UEs to use in their resource selection.

Disclosure of Invention

According to an embodiment, a method implemented by a User Equipment (UE) is provided. The method comprises the following steps: the UE determines a candidate resource area for data transmission, wherein the candidate resource area indicates a candidate resource time slot for data transmission; sensing by using sensing opportunities to determine available resources from the candidate resource region, wherein the sensing opportunities are determined according to the candidate resource region, the sensing period and the maximum sensing opportunity number; selecting a resource from the available resources; data is transmitted on the selected resources.

According to another embodiment, a method implemented by a User Equipment (UE) is provided. The method comprises the following steps: the UE determines a candidate resource area for data transmission, wherein the candidate resource area indicates a candidate resource time slot for data transmission; sensing by using sensing time slots in a time slot window to determine available resources from candidate resource time slots, wherein a first time slot in the sensing time slots is determined according to the first time slot in the candidate resource time slots; selecting a resource from the available resources; data is transmitted on a resource selected from the available resources.

Optionally, in any of the above aspects, the data transmission is a periodic transmission.

Optionally, in any of the above aspects, the first time slot of the perceived time slots is further determined according to a default time slot number.

Alternatively, in any of the above aspects, the default number of slots is 31.

Optionally, in any of the above aspects, the first time slot of the perceived time slots is further determined according to a preconfigured number of time slots, the preconfigured number of time slots being less than a default number of time slots.

Optionally, in any of the above aspects, the first slot of the perceived slots is earlier than the first slot of the candidate resource region by a default number of slots.

Optionally, in any of the above aspects, the first one of the perceived time slots is a preconfigured number of time slots earlier than the first one of the candidate resource time slots.

Optionally, in any of the above aspects, the data transmission is non-periodic.

Optionally, in any one of the above aspects, the first time slot of the perceived time slots is further determined according to a minimum perceived time slot number, the minimum perceived time slot number being a default value.

Optionally, in any of the above aspects, a first slot of the perceived slots is earlier than a first slot of the candidate resource slots by at least a minimum perceived slot number.

Alternatively, in any of the above aspects, the default value is 31.

Optionally, in any one of the above aspects, a first slot of the perceived slots is earlier than a first slot of the candidate resource slots by at least a minimum perceived slot number, the minimum perceived slot number being a preconfigured value in a range of values.

According to yet another embodiment, a method implemented by a User Equipment (UE) is provided. The method comprises the following steps: the UE determines a candidate resource area for data transmission, wherein the candidate resource area indicates a candidate resource time slot for data transmission; sensing using a sensing time slot to determine available resources from a candidate resource region, wherein the sensing is based on the candidate resource region and a sensing window size; comparing a ratio of available resources to a threshold, wherein the threshold is a function of a perceived window size; selecting a resource from among the available resources in response to the ratio being greater than the threshold; data is transmitted on the selected resources.

Optionally, in any above aspect, the UE-implemented method further comprises increasing the perceived window size in response to the ratio being less than the threshold.

Optionally, in any of the above aspects, the UE-implemented method further comprises increasing the threshold in response to an increased perceived window size.

Optionally, in any above aspect, the selecting comprises the UE selecting the plurality of candidate resources based on a difference between a first time slot of the first reserved resource and a second time slot of the second reserved resource being less than a value.

Optionally, in any of the above aspects, the ratio is determined from the number of available resources and the total number of candidate resources.

According to yet another embodiment, a method implemented by a User Equipment (UE) is provided. The method comprises the following steps: the UE determines a candidate resource area for periodic data transmission, wherein the candidate resource area indicates a candidate resource time slot for periodic data transmission; sensing using a sensing time slot to determine available resources from a candidate resource region, wherein the sensing is based on the candidate resource region and a sensing window size; calculating a channel busy rate according to the perception within the channel busy rate measurement window; and selecting a resource selection method according to the channel busy rate and the threshold value, wherein the resource selection method is one of a perception selection or a random selection.

Optionally, in any of the above aspects, the channel busy rate is a ratio of subchannels measured by the UE for which the side-link signal strength exceeds a second threshold of signal strength perceived over a channel busy rate measurement window.

Optionally, in any above aspect, the UE-implemented method further comprises selecting resources from the candidate resource region, wherein the selecting comprises selecting the resources randomly within a specified time in response to the UE determining that the resource selection method is a random selection.

Alternatively, in any of the above aspects, the specified time selected at random is a fixed value.

Alternatively, in any of the above aspects, the randomly selected specified time is a random value within a range.

According to yet another embodiment, a method implemented by a User Equipment (UE) is provided. The method comprises the following steps: the UE perceives using a perceived time slot having a first perceived window size for a first candidate resource region including candidate resources for data transmission by a second UE; determining a preferred resource or a non-preferred resource set in the first candidate resource region for data transmission by the second UE; selecting resources from a second candidate resource region having a second perceived window size, the second candidate resource region containing second candidate resources for transmitting a preferred or non-preferred set of resources to a second UE, wherein a last time slot of the second candidate resource region is determined from the first candidate resource region; the preferred resources or the non-preferred set of resources are transmitted to the second UE for transmission by the second UE on the selected resources.

Optionally, in any of the above aspects, the last slot of the second candidate resource region is earlier than the first slot of the first candidate resource region by a number of slots determined by the subcarrier spacing.

Optionally, in any of the above aspects, the last slot of the second candidate resource region is earlier than the first slot of the first candidate resource region by a processing time for resource selection.

Optionally, in any of the above aspects, the last slot of the second candidate resource region is earlier than the first slot of the first candidate resource region for processing time for processing awareness and resource selection.

Optionally, in any of the above aspects, the second perceived window size is based on a first time slot of the first candidate resource region.

Optionally, in any of the above aspects, a last slot of the second sensing window is earlier than a first slot of the first candidate resource region for processing time for sensing and resource selection.

According to yet another embodiment, a User Equipment (UE) is provided. The UE comprises: a non-transitory memory comprising instructions, and one or more processors in communication with the memory, the one or more processors executing the instructions to: determining a candidate resource region for data transmission, the candidate resource region indicating a candidate resource slot for data transmission; sensing by using sensing opportunities to determine available resources from the candidate resource region, wherein the sensing opportunities are determined according to the candidate resource region, the sensing period and the maximum sensing opportunity number; selecting a resource from the available resources; data is transmitted on the selected resources.

According to yet another embodiment, a User Equipment (UE) is provided. The UE comprises: a non-transitory memory comprising instructions, and one or more processors in communication with the memory, the one or more processors executing the instructions to: determining a candidate resource region for data transmission, the candidate resource region indicating a candidate resource slot for data transmission; sensing using sensing time slots within a time slot window to determine available resources from a candidate resource region, wherein a first time slot in the sensing time slots is determined according to the first time slot in the candidate resource time slots; selecting a resource from the available resources; data is transmitted on a resource selected from the available resources.

Alternatively, in any of the above aspects, the default number of slots is 31.

Optionally, in any of the above aspects, the data transmission is non-periodic.

Alternatively, in any of the above aspects, the default value is 31.

According to yet another embodiment, a User Equipment (UE) is provided. The UE comprises: a non-transitory memory comprising instructions, and one or more processors in communication with the memory, the one or more processors executing the instructions to: determining a candidate resource region for data transmission, the candidate resource region indicating a candidate resource slot for data transmission; sensing using a sensing time slot to determine available resources from a candidate resource region, wherein the sensing is based on the candidate resource region and a sensing window size; comparing a ratio of available resources to a threshold, wherein the threshold is a function of a perceived window size; selecting a resource from among the available resources in response to the ratio being greater than the threshold; data is transmitted on the selected resources.

Optionally, in any above aspect, the one or more processors further execute the instructions to increase the perceived window size in response to the ratio being less than the threshold.

Optionally, in any of the above aspects, the one or more processors further execute the instructions to increase the threshold in response to an increased perceived window size.

Optionally, in any of the above aspects, the selecting of resources includes the UE selecting the plurality of candidate resources based on a difference between a first time slot of the first reserved resource and a second time slot of the second reserved resource being less than a value.

According to yet another embodiment, a User Equipment (UE) is provided. The UE comprises: a non-transitory memory comprising instructions, and one or more processors in communication with the memory, the one or more processors executing the instructions to: determining a candidate resource region for periodic data transmission, the candidate resource region indicating a candidate resource slot for periodic data transmission; sensing using a sensing time slot to determine available resources from a candidate resource region, wherein the sensing is based on the candidate resource region and a sensing window size; calculating a channel busy rate according to the perception within the channel busy rate measurement window; a resource selection method is selected according to the channel busy rate and the threshold, wherein the resource selection method is one of a perceptual selection or a random selection.

Optionally, in any above aspect, the one or more processors further execute the instructions to select resources from the candidate resource region, wherein the resource selection method comprises randomly selecting resources within a specified time in response to the UE determining that the resource selection method is a random selection.

According to yet another embodiment, a User Equipment (UE) is provided. The UE comprises: a non-transitory memory comprising instructions, and one or more processors in communication with the memory, the one or more processors executing the instructions to: sensing using a sensing time slot having a first sensing window size for a first candidate resource region, the first candidate resource region including candidate resources for data transmission by a second UE; determining a preferred resource or a non-preferred resource set in the first candidate resource region for data transmission by the second UE; selecting resources from a second candidate resource region having a second perceived window size, the second candidate resource region containing candidate resources for transmitting a preferred resource or a non-preferred resource set to a second UE, wherein a last time slot of the second candidate resource region is determined from the first candidate resource region; the preferred resources or the non-preferred set of resources are transmitted to the second UE for transmission by the second UE on the selected resources.

Drawings

For a more complete understanding of the present disclosure and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:

fig. 1 shows a diagram of an embodiment of a wireless communication network;

FIG. 2 shows a diagram of in-coverage/out-of-coverage operation;

FIG. 3 illustrates a diagram of resource pools in a resource grid;

fig. 4 shows a diagram of a sub-channel with PSCCH, PSSCH and PSFCH resources;

FIG. 5 shows a diagram of the awareness and resource selection window of Rel-16 NR V2X side uplink mode 2;

FIG. 6A shows a diagram of full perception in the Rel-16 NR side uplink;

FIG. 6B illustrates a diagram of partial perception according to an exemplary embodiment disclosed herein;

FIG. 7 illustrates a diagram of progressive perception according to an exemplary embodiment disclosed herein;

FIG. 8 illustrates a diagram of switching between a perceptually based resource selection and a random resource selection in accordance with an example embodiment disclosed herein;

FIG. 9A illustrates a flow chart for switching between a perceptually based resource selection and a random resource selection in accordance with an example embodiment disclosed herein;

FIG. 9B illustrates a flow chart of switching between a perceptually based resource selection and a protected random resource selection in accordance with an example embodiment disclosed herein;

FIG. 10 illustrates a graph based on periodic partial awareness in accordance with an exemplary embodiment disclosed herein;

fig. 11 illustrates a timing diagram for continuous partial awareness based SL transmissions with periodic traffic in accordance with an example embodiment disclosed herein;

Fig. 12 illustrates a diagram of a valid range over a slot in a resource selection window according to an example embodiment disclosed herein;

fig. 13 illustrates a timing diagram for continuous partial awareness based SL transmissions with aperiodic traffic according to an example embodiment disclosed herein;

fig. 14 illustrates a timing diagram of UE B perceiving and transmitting coordination messages for periodic traffic at the UE in accordance with an example embodiment disclosed herein;

fig. 15 illustrates a timing diagram for UE B to perceive and send coordination messages for aperiodic traffic at the UE according to an example embodiment disclosed herein;

FIG. 16 illustrates a diagram of an embodiment of a processing system; and

fig. 17 shows a diagram of an embodiment of a transceiver.

Corresponding numerals and symbols in the various drawings generally refer to corresponding parts, unless otherwise indicated. The drawings are drawn to clearly illustrate the relevant aspects of the embodiments and are not necessarily drawn to scale.

Detailed Description

The making and using of the embodiments of the present disclosure are discussed in detail below. However, it should be understood that the concepts disclosed herein may be embodied in a variety of specific contexts and that the specific exemplary embodiments discussed herein are merely illustrative and are not intended to limit the scope of the claims. Further, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the disclosure as defined by the appended claims. Although the inventive aspects are described primarily in the context of 5G wireless networks, it should also be appreciated that the inventive aspects may also be applicable to 4G wireless networks and 3G wireless networks.

Several embodiments are disclosed herein to reduce side-link power consumption. While these embodiments apply to all UEs, these embodiments are particularly applicable to UEs supporting side-link functionality.

Fig. 1 shows a network 100 for transmitting data. The network 100 includes a base station 110 having a coverage area 101, a plurality of mobile devices 120, and a backhaul network 130. As shown, the base station 110 establishes an uplink (dashed line) and/or downlink (dotted line) connection with the mobile device 120 for carrying data from the mobile device 120 to the base station 110 and vice versa. The data carried over the uplink/downlink connection may include data communicated between the mobile devices 120, as well as data communicated to/from a remote end (not shown) over the backhaul network 130. A side-link connection between mobile device 120 and mobile device 120 is also shown. As described above, the side-uplink connection provides the mobile devices 120 and 120 with the ability to communicate directly with each other. As used herein, the term "base station" refers to any component (or collection of components) for providing wireless access to a network, such as an enhanced base station (enhanced base station, eNB), macrocell, femtocell, wi-Fi Access Point (AP), or other wireless-enabled device. The base station may provide wireless access according to one or more wireless communication protocols, such as long term evolution (long term evolution, LTE), LTE-advanced (LTE-a), high speed packet access (High Speed Packet Access, HSPA), wi-Fi 802.11a/b/g/n/ac, and so on. As used herein, the term "mobile device" refers to any component (or collection of components) capable of establishing a wireless connection with a base station, such as User Equipment (UE), mobile Station (STA), and other wireless-enabled devices. In some embodiments, network 100 may include various other wireless devices, e.g., repeaters, low power nodes, etc.

In Release-17, a sidelink enhancement work item is approved to further enhance the ability and performance of sidelink communications. One of the important goals of this work item is to introduce a UE coordination mechanism in which UEs share information about resources for other UEs to use in their resource selection.

Fig. 2 shows that the communication is in or out of coverage: through in-coverage (IC) operation, there is a central node (eNB, gNB) and the central node can be used to manage the side-links. Through out-of-coverage (OOC) operation, the system operation is fully distributed, and the UE selects resources by itself. Mode 1NR UEs transmit and receive information under network management, and mode 2NR UEs transmit and receive information without network management. In this disclosure, some UEs may also be facilitated/assisted in selecting their resources.

For the purpose of side-link communication, the concept of resource pool is introduced into LTE side-link and reused for NR side-link. The resource pool is a set of resources that can be used for side-link communications. The resources in the resource pool are configured for different channels including control channels, shared channels, feedback channels, synchronization signals, reference signals, broadcast channels (e.g., primary information blocks), and the like. The criteria define rules for how resources are shared and for the particular configuration of the resource pool.

Fig. 3 shows an example of a resource pool in a time-frequency resource grid. The side-uplink resource pool may be configured in units of time slots in the time domain and in units of physical resource blocks (physical resource block, PRBs) or subchannels in the frequency domain. A subchannel is composed of one or more PRBs.

For NR mobile broadband (MBB), each physical resource block (physical resource block, PRB) in the grid is defined as a time slot of 14 consecutive OFDM symbols in the time domain and 12 consecutive subcarriers in the frequency domain, i.e. each resource block contains 12×14 Resource Elements (REs). (when used as frequency domain units, PRBs are 12 consecutive subcarriers.) when a normal cyclic prefix is used, one slot has 14 symbols, and when an extended cyclic prefix is used, one slot has 12 symbols. The duration of the symbol is inversely proportional to the subcarrier spacing (subcarrier spacing, SCS). For SCS at 15,30,60,120 khz, the time slots have a duration of 1,0.5,0.25,0.125 ms, respectively. Each PRB may be allocated to a combination of control channel, shared channel, feedback channel, reference signal, etc. Furthermore, some REs of PRBs may be reserved. Similar structures are used on the side links. The communication resources may be a PRB, a set of PRBs, a code (similar to PUCCH if CDMA is used), a physical sequence, a set of REs, etc.

Fig. 4 illustrates exemplary sub-channels for communication. The physical side-chain control channel (physical sidelink control channel, PSCCH) carries side-link control information (sidelink control information, SCI). The source UE schedules data transmission on the physical side-chain shared channel (physical sidelink shared channel, PSSCH) using the SCI. The SCI may transmit time and frequency resources of the PSSCH, parameters of the hybrid automatic repeat request (hybrid automatic repeat request, HARQ) process, such as redundancy version, process ID, new data indicator, and resources of the physical side chain feedback channel (physical sidelink feedback channel, PFSCH). The PFSCH may carry an indication (HARQ-ACK) (e.g., an acknowledgement or negative acknowledgement (ACK/NACK)) of whether the receiver destination UE correctly decodes the payload carried on the PSSCH. The SCI may also carry a bit field indicating a representation of the source UE. The SCI may also carry a bit field indicating a representation of the destination UE. Other fields include a modulation coding scheme for encoding the payload and modulating the encoded payload bits; demodulation reference signal (demodulation reference signal, DMRS) pattern, antenna port, and priority of payload (transmission).

In Release-16, 3GPP introduces NR-side uplink communication between devices such as User Equipment (UE) in addition to typical downlink and uplink transmissions. In a device supporting side-uplink communication, the UE will periodically exchange control/data information to other UEs.

In Rel-17, the side-link enhancements specify resource allocation to reduce the power consumption of the UE. The baseline is to introduce principles of Rel-14 LTE side uplink random resource selection and partial awareness into the Rel-16 NR side uplink resource allocation pattern. Taking Rel-14 as the baseline does not preclude the introduction of new solutions to reduce power consumption in cases where the baseline fails to function properly.

In the Rel-16 NR v2x side uplink, mode 2 UEs transmit and receive information without network management. The UE allocates resources from the resource pool itself for the side-uplink transmission. The resource allocation depends on the awareness and reservation procedure as shown in fig. 5. During the sensing, the monitoring UE detects SCI transmitted in each slot in the sensing window and measures reference signal received power (reference signal received power, RSRP) of resources indicated in the SCI. The monitoring UE may also receive the transmission of data (also the receiving UE) while perceiving it. For periodic traffic, i.e. resource reservation for side-link transmission, if UE (e.g. UE m) occupies time slot s _m On the resources, then the UE will also occupy time slot s _m +q*RRI _m Resources on, where q is an integer, RRI _m Is the resource reservation interval of UE m detected by the sensing UE. The detection includes the steps of receiving and decoding the PSCCH and processing SCI within the PSCCH.

For aperiodic or dynamic transmissions, the transmitting UE reserves multiple resources and indicates the next resource in the SCI. Thus, based on the perceived result, the monitoring UE can determine which resources are likely to be occupied in the future, and if the measured RSRP on occupied resources during the perceived period is greater than the RSRP threshold, these resources can be avoided for their own transmissions.

Fig. 5 shows timing information about the awareness and resource selection of the Rel-16 NR side uplink transmission, commonly referred to as full awareness. When the resource selection is triggered on slot n, the resource selection is triggered according to the time slot in the sensing window (i.e. instant [ n-T ₀ ,n-T _proc,0 ]Upper) the transmitting UE in the resource selection window (i.e., in time slot n + T ₁ ,n+T ₂ ]Upper) select resources, wherein

T ₀ : a number of time slots having a value determined by the resource pool configuration;

T _proc,0 : the time required for the UE to complete the sensing process;

T ₁ : candidate resource identification and processing time required for resource selection, T ₁ ≤T _proc,1 ；

T ₂ : the last slot of the resource pool for resource selection, which is reserved for UE implementation, but at [ T _2min, PDB]Within the range of (1), wherein T _2min Is T ₂ PDB represents the packet delay budget, i.e., the remaining time for the UE to transmit a data packet;

T _proc,1 : the UE identifies candidate resources and selects the maximum time required for the new side-link resources.

To select resources, the transmitting UE needs to identify candidate resources by excluding occupied resources with measured RSRP that exceed a configured RSRP threshold. The transmitting UE then compares the ratio of available resources to all resources in the selection window. If the ratio of available resources is greater than the threshold X, the UE randomly selects a resource among the candidate resources. If the ratio is small, the transmitting UE increases the RSRP threshold by 3dB and checks the available resource ratio until the available resource ratio is equal to or greater than X%. X is selected from the list sl-txfacecentagelist, the value of which is determined by the data priority, as specified in TS 38.214:

sl-TxParcentageList: given prio _TX Is defined as the sl-TxParcentageList (prio) converted from percentage to ratio _TX )。

Possible values for X in the sl-txfacecentagelist are 20, 35 and 50 (corresponding to 20%, 35% and 50%, respectively), as specified in TS38.331, below:

when the monitoring UE performs sensing, the monitoring UE decodes SCI on the PSCCH on every resource and every slot in the sensing window when the monitoring UE is not transmitting. The monitoring UE also needs to measure RSRP on the PSSCH for each identified resource allocation. This process results in high power consumption. To reduce power consumption, a smaller window size needs to be used for sensing, i.e. partial sensing. Some problems of partial perception are identified. General concepts and solutions are provided, as well as detailed specifications for various situations.

As shown in fig. 6A, the resources in the resource selection window form a large resource pool. With full awareness, in time slot [ n-T ] ₀ ,n-T _proc,0 ]In the above sensing window, the transmitting UE is able to detect occupied time slots in a large time range and derive possible resource collisions for periodic transmissions in the resource selection window. Since the resource pool in the resource selection window is large and the sensing period is long, the candidate resource set formed from the sensing result is reliable. In case the candidate resource ratio is greater than X% for a certain value of X, there is a relatively large amount of resources for the transmitting UE to choose from, so that there is less potential collision with 1) undetected transmissions from some UEs for periodic (new or old) and aperiodic traffic and 2) new resource choices from other UEs.

However, for partial awareness as shown in fig. 6B, taking periodic transmission as an example, the resource selection comes from a smaller selection window in Y slots, and the transmitting UE derives available candidate resources according to the awareness result of the smaller awareness window. Due to the smaller perceived window and SL transmissions with different periods, the detection of available candidate resources for resource selection is less reliable. Furthermore, since the resource selection window is smaller, the number of available resources is much smaller at the same ratio of available resources. Thus, the potential resource conflict resulting from the two situations described above is far higher than fully perceived.

It is therefore beneficial to have partial awareness of different available thresholds on the available resource ratio. In general, the threshold X% should be increased for partial awareness with smaller awareness windows and/or smaller resource selection pools. The threshold may be a function of the size Y of the resource selection or determined by Y, wherein the perceived result is used for resource reservation. The specification of X% for partial perception may be one of the following:

1. a new list of X% may be specified for partial awareness, such as sl-txfacecentagepartialsensinglist,

one or more offset values for partial awareness on the existing list sl-txfacecentagelist in nr version 16For example (X) _i +ΔX)% or (X) _i +ΔX _i )％，

3. As a special case, for partial awareness, the next in the list sl-txfacecentagelist is selected for the Y range, i.e. assume X _i From sl-TxPercentageList (prio) _TX ) Obtained if X _i+1 Available, then X is selected in the list sl-TxPancentrageList _i+1 ，

4. Under certain conditions, the restriction of X in the partial perception list, e.g., very small Y, has consecutive partial perceptions of small perceived size,

x is a function of data priority and Y, i.e. X (prio _TX Y) is used for partial perception. For example, as threshold X _i % specifies the range of Y, Y for a certain priority _th,i ≤Y<Y _th,i+1 。

Partial perception with adaptive threshold:

for resource selection over a set of slots of size Y and one or more sensing occasions that sense Y slots at each occasion, the UE may perform partial sensing with threshold adaptation.

Given a set of partial perceptual values Y ₁ 、Y ₂ ……Y _n ，Y ₁ <Y ₂ ……<Y _n And a set of corresponding thresholds X regarding the available ratio of resource selection ₁ 、X ₂ ……X _n ，X ₁ ≥X ₂ ≥……≥X _n The transmitting UE starts to use Y ₁ The candidate slots are partially perceived. If before increasing the RSRP threshold, Y ₁ The ratio of available resources on each time slot is initially less than X ₁ % then the UE may be having a new threshold value X ₂ Using Y in the next round of partial perception ₂ The candidate slots change part of the sensing process.

Progressive perception:

as shown in fig. 7, when a packet arrives, the transmitting UE is at t ₀ Begin sensing and executing t ₁ -t ₀ Perception of individual timeslots. If the ratio of available resources is less than the corresponding threshold X ₁ In%, X ₁ From t ₁ -t ₀ And/or data priority determination, then the transmitting UE may continue partial awareness until t ₂ Rather than increasing the RSRP threshold. If the ratio of available resources is less than X ₂ In%, X ₂ Based on perceived size, up to t ₂ Then the perception continues until:

the ratio of available resources is greater than X _i % or

Reaching a preconfigured threshold for perceived slot size, or

The remaining time slots in the resource selection window are below a threshold, or

The remaining packet delay budget is below a threshold.

The increment of the perceived time slots for progressive perception may be the same.

Random resource selection:

randomly selecting resources without monitoring the resources occupied by other UEs can of course save a lot of power. In order to achieve a large power saving, it is preferable to let the transmitting UE perform random resource selection under some conditions, even though the transmitting UE is able to make partial/full awareness. One embodiment allows the transmitting UE to switch between partial/full awareness and random resource selection, which can be seen as a special case of the general concepts presented above.

Fig. 8 shows a diagram of switching between a perceptually based resource selection and a random resource selection. For perceptually based resource selection, the reselection procedure attempts to select a number of subchannels based on the perceptual evaluation. The system load may be represented by the occupied resource ratio or the available resource ratio, which may be obtained through full or partial awareness. When the load is high, meaning that the occupied resource ratio is large, e.g. close to 1, or the available resource ratio is small, e.g. close to 0, the UE may switch to random resource selection. These UEs do not rely on the perceived result of the high load, as the perceived threshold will increase substantially in order to find the available resources. Based on this observation, one approach is to perform an initial sense to determine the system load from the sense results. If the result indicates a high load, the perceived benefits over random resource selection are limited. In this case, the transmitting UE should perform random selection instead of partial awareness.

On the other hand, when the load is low, meaning that the occupied resource ratio is very small, i.e. close to 0, or the available resource ratio is very large, i.e. close to 1, other UEs in the vicinity do not or hardly occupy resources. The transmitting UE may then switch to random resource selection to reduce power consumption. Note that the transmitting UE must be able to monitor the PSCCH to make this determination. The condition may be determined by a threshold of channel occupancy (channel occupation ratio, CR) or available resource ratio, e.g., X _highload % and X _lowload % setting. In addition, a predefined timer T can also be specified and configured _fb For transmitting UE fallback (restoration) to partial/full awareness. To improve power saving, one embodiment is to switch back to partial sensing where the minimum number of slots is configured, and then gradually increase the number of slots based on the sensing result. Randomness may be introduced so that probabilistic switching may be achieved. For example, a uniform distribution in [0,1 ] is generated]And compares it with a pre-configured value p epsilon 0,1]A comparison is made. If x<p, then switch to random resource selection, or if x≡p, then not switch.

Fig. 9A shows a flow chart for switching between a perceptually based resource selection and a random resource selection.

Furthermore, conditions indicating a high load or low load CR of the system or the available resource ratio may remain for a period of time. However, the UE may perform a probabilistic handover after each sensing procedure, which eventually results in a handover in a very short time. To avoid this and keep the system stable, the UE may stay in the perceived state for a certain period of time once the probabilistic handover causes a return to perception instead of performing random resource selection. This can be achieved by a new timer Ts. A flow chart with such stability protection is shown in fig. 9B.

Another case is a low power level (e.g., battery level). In this case, it is beneficial for the UE to perform random resource selection instead of partial/full sensing in order to reduce power consumption when the battery is about to run out or below a certain amount of power. The low power UE may also perform random resource selection at all times and not switch between partial/full awareness and random resource selection.

Based on periodic partial perception:

as shown in fig. 10, when performing periodicity-based partial awareness, a transmitting UE monitors one or more periodic occasions, each occasion having Y candidate slots, wherein the periodic awareness occasions are according to Time slot set of->Is a set of Y candidate slots within the resource selection window, and the set of k values indicates a sensing opportunity. For example, when k ε {1,2}, the UE pair +.>And->Partial sensing is performed. If k is specified as a bitmap as in LTE V2X, i.e. { i ₁ ,i ₂ ,…,i _k ,…,}，i _k E {0,1}, then the UE is +.>Performs partial sensing of the timing of (i), where i _k =1. Since for certain periods the sensing occasions of small k-values may fall in time slots of the UE processing time that are not used for sensing to exclude time slots that are not used for sensing, the nearest sensing occasion is defined as k-value corresponding to a period P than given _reserve Is-> Early late sense opportunity. Then, for a given period P _reserve The k value corresponding to the last periodic sensing opportunity preceding the most recent sensing opportunity is the second most recent sensing opportunity. The k value corresponding to the last periodic sensing opportunity preceding the second most recent sensing opportunity is the third most recent sensing opportunity, and so on.

Based on the perceived result, the transmitting UE forms a set of candidate resources over a set of Y slots in the resource selection window and selects one for side-uplink transmission.

The transmitting UE may select Y from a pre-configured range, where the minimum and maximum values of the range need to be configured. If the default maximum corresponds to full perception, then no maximum is required. Different or minimum Y values may be configured for different priorities in order to obtain reliable perceived results. The process may then set a set of minimum Y values corresponding to different priorities in the list, due to the discrete values of the priorities.

However, setting different minima does not completely solve the problem of different priorities, because priority information for new data may be obtained when slot n triggers resource selection. Perception processThe size of slot Y of (c) may be smaller than the minimum Y value from new data with higher priority triggered at n. In this case, it may not make sense to configure different minimum Y for different priorities. Furthermore, for high priority, setting a minimum Y value to accommodate all possible traffic loads (whether heavy or low) may result in a very large minimum Y value, which may be inefficient for power saving. The value of the minimum Y is then preferably configured to be small, but the UE needs to adjust Y according to the perceived result, e.g. the available resource ratio threshold for partial perception as described below.

The perceived result may be unreliable due to the short time of partial perception, especially for the available resource ratio. Furthermore, since aperiodic transmission in SL mode 2 is supported and there is a small perceived window, resource collision is highly likely to occur, especially when the ratio of partially perceived available resources is small. For example, a portion perceives 20% of the available resources, but 80% of the resources are already occupied, indicating a higher system load. At shorter perceived times, the variance of the actual available resource ratio of 20% is much greater than the variance of the full perception. Therefore, the collision rate based on this perceived result may be much higher than the full perception. On the other hand, since the small Y candidate pool is smaller, the partially perceived available candidate is much smaller than the fully perceived available candidate for the same ratio of available resources, e.g., 20%. The collision rate may also be higher if another UE with new data reserves resources in the same area. Then, for very small part perception of Y, a threshold value of 20% greater than the available resource ratio should be used. Therefore, it is beneficial to specify a new list threshold X% or a new partial awareness rule.

Specifically, one embodiment reiterates here some of the 4 possible specifications for threshold X%. For periodic partial awareness, a minimum of Y and X, i.e., a relationship between X (Y), may be specified. It may be a function of Y and data priority, i.e., X (prio _TX Y). In addition, the threshold X may be specified by a range of Y _i % for a particular priority, Y _th,i ≤Y<Y _th,i+1 。

When Y is<Yth(X _min ) When this is the case, an alternative approach may simply limit the lowest X value from the existing table sl-TxParcentageList specified in R16, where X _min The next X on the list is selected and used based on the data priority.

To save power better, the UE may start with Y, which is the configured minimum. If the ratio X' of available resources in the perceived result is less than X (prio) of the configuration of minimum Y _TX Y), the UE adds Y to the next value in the list or determines the next Y1 according to the sensing result, and performs partial sensing in the next round of sensing.

For periodic sensing occasions, since R16 mode 2 supports SL transmissions and aperiodic transmissions with different periodicity, it is desirable to provide some flexibility for partial sensing. The value k may be configured with a bitmap. To achieve better power saving performance, the maximum number of 1's in the bitmap may be specified, i.e., up to k in the k bitmap may be configured _max 1, which is the maximum perceived timeNumber of machines. For example, the bitmap of k is denoted as { { i ₁ ,i ₂ ,…,i _k, …,i ₁₀ (where k) _max Sum of the number of =5, 1 isI.e. k _max Maximum number of sensing opportunities, or k _max The latest timing.

Based on continuous partial perception:

the side-uplink transmission supports aperiodic transmission. For side-uplink resource allocation, the UE wants to detect possible aperiodic traffic from other UEs to avoid resource collision. To this end, the UE performs successive partial awareness based resource (re) selection. Resource allocation based on successive partial awareness for awareness of periodic traffic and aperiodic traffic of the UE may be specified.

The symbol list may include:

T _CPS,st : the first time slot in the sensing window (generally defined),

T _CPS,end : the last slot in the sensing window (generally defined), or the sensing window with the smallest window size,

T' _CPS,end : the last time slot (generally defined) in the perception window, or the perception window with the largest window size,

n+T _A : the first time slot of the sensing window associated with the time slot n of the trigger resource (re) selection,

n+T _B : the last slot of the sensing window associated with the slot n of the trigger resource (re) selection,

t _y0 : in periodic partial awareness, a resource of size Y selects a first time slot in a set of candidate time slots in a window.

Continuous-based partial awareness for periodic traffic:

for a perceived UE with periodic traffic, as shown in fig. 10, when triggering resource (re) selection in slot n, the UE will select a window [ n+t ] from the resources ₁ ,n+T ₂ ]Selecting resources from a set of Y candidate time slots in a setA source. Starting time slot of Y candidate time slots at time slot t _y0 Where it is located. If the UE performs continuous-based partial awareness, then the UE monitors [ T ] _CPS,st ,T _CPS,end ]Time slots in between, how T is selected _CPS,st And T _CPS,end Is a problem of (a).

For aperiodic traffic, the UE selects multiple candidate resources, but limits the gap between two consecutive candidate resources to less than 32 slots. For example, when in time slot m ₁ When a resource is selected up, it means that another candidate resource is located in slot [ m ] ₁ -31,m ₁ +31]Within a range of (2). Therefore, in order to select resources in the Y candidate slot sets, it is not necessary to monitor the slot t _y -32 or a previous time slot. Then, the start of successive partial perceptions is at T _CPS,st ＝t _y0 -31. Since n is known in advance for periodic traffic, t _y0 -31<n is possible. Given the time to complete the sensing process and the resource selection process, the end time slot of the continuous partial sensing is T _CPS,end ＝t _y0 -T _proc,0 -T _proc,1 . Successive partial perceptions are similar to the re-evaluation process. To provide better resource selection, one approach may limit the total processing time to T _proc,1 . Then T _CPS,end ＝t _y0 -T _proc,1 . The sensing window of the continuous part sensing is [ t ] _y0 -31,t _y0 -T _proc,1 ]. If the perceptual window is defined by the symbol n + T _A ,n+T _B ]Specified, then T _A ＝-n+t _y0 -31 and T _B ＝-n+t _y0 -T _proc,1 。

As described above, the monitoring time slot can only determine the resource occupancy or reservation from the aperiodic traffic within 32 time slots based on the sensing result. For example, as shown in fig. 12, monitoring slot n+1 will detect the resource occupancy from n+1 to n+32, monitoring slot n+2 will detect the resource occupancy from n+2 to n+33, and so on. The monitoring slot n+31 will then detect the resource occupancy from n+31 to n+62. If the resource selection window starts with n+32, then the perception on time slot n+1 yields a valid perception result on only one time slot in the resource selection region (i.e., time slot n+32). Although the following are providedThis may however improve perceived reliability over time slot n +32, but has a much smaller impact on the resource selection area. Similarly, for several starting slots in the perceived window, those perceived slots close to the resource selection starting slot have a large coverage over the resource selection area, e.g. perception over slot n+31 can provide slots [ n+32, n+62 ] in the resource selection window]The resources are occupied; and the perception on time slot n+30 can provide time slots n+32, n+61 in the resource selection window ]The resource occupation on the above, and so on. Therefore, to achieve higher efficiency in terms of perception and power saving, it is desirable to reduce the perceived window size. For continuous partial awareness of periodic traffic, the awareness window may be later than T _CPS,st ＝t _y0 -31 starts, which is 31 slots earlier than the first slot of the Y candidate resource areas. For flexibility T _CPS,st Can be configured by higher layers, default to t _y0 -31. Then, T can be specified _CPS,st Or T _A For example T _CPS,st ＝t _y0 -a×32+1, a=1, 1/2, 1/4 … …. Such a flexible design with shorter perceived time may be suitable for inter-UE coordination, where the timing of the overall coordination process is strict, especially for non-periodic traffic.

There may be an overlap between the time slots used for successive partial awareness and the time slots in periodic based partial awareness. Based on the sensing results of the successive partial sensing and the periodic partial sensing (if available), the UE selects resources from the set of Y candidate slots within the resource selection window. After selecting the resources, the UE then performs re-evaluation and preemption in the case of configuration.

The perceived result may be unreliable due to the short perceived window size. On the other hand, the value of Y may be greater than 32. Successive partial awareness vs. time slot t _y0 -T _proc,1 +32,t _y0 +Y-1]There is no benefit in the selection of resources. Furthermore, if the sensing UE is in the sensing window [ t ] _y0 -31,t _y0 -T _proc,1 ]A large amount of aperiodic traffic is detected in the network, resulting in t _y0 ,t _y0 -T _proc,1 +31]Occupy a lot of resources, then rely on [ t ] _y0 -T _proc,1 +32,t _y0 +Y-1]The result of periodic sensing of resource allocation on this will result in many resource conflicts. Thus, a larger threshold of available resource ratio X% is desirable than for full perception of data with the same priority. If [ t ] _y0 ,t _y0 -T _proc,1 +31]It is also beneficial to continue with continuous partial awareness with a smaller amount of available resources. However, unlike the re-evaluation procedure, where transmission resources are allocated over time slot m, for example, the UE does not have this information in advance. It is not appropriate to set the sensing slots based on m. Although the available candidate resource set S can be reported to the MAC layer on a certain slot _A And is authorized on slot m, these two-phase procedures may functionally overlap with the re-evaluation procedure. Since the purposes of initial awareness and re-assessment are different, one for resource allocation and the other for checking for resource conflicts, it is preferable to separate initial awareness and re-assessment. Thus, the UE may continue to perceive until T' _CPS,end . Although the UE may continue to perceive until slot T' _CPS,end ＝t _y0 +Y-1-T _proc,1 This may leave only a maximum of 1 slot for resource selection, but preferably an offset, i.e., T 'is set' _CPS,end ＝max(t _y0 -T _proc,1 ,t _y0 +Y-1-T _proc,1 -T' _CPS,offset )。T' _CPS,offset May be provided or fixed at 31. The UE may be in time slot t _y0 -T _proc,1 At any time thereafter, available resources are reported to the MAC layer.

Based on the above description, one embodiment proposes setting minimum and maximum values related to the perceptual boundary, i.e., T _CPS,end And T' _CPS,end For continuous partial awareness of transmissions with periodic traffic. The UE reports the set of available resources at any time in between. If the perceptual window representation is designated as [ n+T ] _A ,n+T _B ]Then TB or T _B,min ＝-n+T _CPS,end And T is _B,max ＝-n+T' _CPS,end T is provided above _CPS,end And T' _CPS,end Is a value of (2). After selecting the resources, re-evaluation or preemption is performed by the UE or according to the configuration.

Continuous-based partial awareness for aperiodic traffic:

for UEs with aperiodic traffic, the data packets can arrive at any time without any a priori knowledge. Therefore, it is impossible for the UE to know in advance when to trigger the resource selection in slot n. Thus, the continuous-based partial awareness for aperiodic traffic can only start after n, i.e., T _CPS,st >n as shown in fig. 13. The earliest possible starting point is T _CPS,st =n+1, i.e. T _A =1. Of course, one option to define the perceived window size for detecting resource occupancy of non-periodic traffic is 32 minus the processing time to complete perception and resource reservation, i.e., T _CPS,end ＝n+31-T _proc,0 -T _proc,1 . Similar to before, it may be sufficient to at T _proc,1 And finishing the sensing and resource selection process. Then T _CPS,end ＝n+31-T _proc,1 . As a result, only T _proc,1 Processing time for both processes. If the two are separated, T _proc,1 Can be replaced by T _proc,0 +T _proc,1 。

To achieve maximum power saving, the UE may perform partial awareness with a minimum window size to obtain reliable awareness results of resource selection when the UE performs successive partial awareness and triggers resource (re) selection in slot n. The result of perception of aperiodic traffic from other UEs is only for time slot T _CPS,end +T _proc,1 ,T _CPS,end +31]The above resource selection is beneficial. For time slot [ T ] _CPS,end +31,n+T ₂ ]The above resources, if no other perceived results are available, are equivalent to random resource selection. On the other hand, the perceived window size T _CPS,end -T _CPS,st +1 may also be affected at [ T ] _CPS,end +T _proc,1 ,T _CPS,end +31]Reliability of the candidate resources reported above.

Derived from successive partial perceptions [ T ] _CPS,end +T _proc,1 ,T _CPS,end +31]The ratio of available resources is an important factor in resource selection. If the ratio is small, then time slot [ T ] _CPS,end +32,n+T ₂ ]The ratio of available resources on the table may also be small. False, falseAssuming that these available resource ratios are available, reporting the available resource ratios in the SA will result in a higher collision rate. To solve this problem, it is beneficial to first specify a larger threshold on the available resource ratio X%. Second, if the available resource ratio is not large enough, the UE continues to perceive instead of increasing the RSRP threshold. When the available resources are sufficient for resource selection, the UE ceases awareness. The sensing window may be increased by a predefined value.

In addition, due to T ₂ The value of (c) is left to the UE implementation and therefore it is difficult to specify the maximum time slot for the UE to perform successive partial awareness. In this case, one embodiment may specify a minimum perceived window to achieve better power savings. According to the illustration and corresponding discussion in fig. 11, for efficient sensing and power consumption, it is preferable to reduce the sensing window size, in which case the resource selection window is started earlier. Another advantage of having a smaller perceived window for non-periodic traffic is to have a low latency, which is one of the key features of side-uplink dynamic transmission. The minimum perceived end time slot may then be specified using one of the following.

The minimum window size is not configurable, fixed less than 31-T _proc,1 The value of (i.e.T) _B <31-T _proc,1

The minimum window size is configurable, e.g.

Specifying a range of minimum window sizes, wherein the maximum is 31-T _proc,1 For example 31-T _B,min ≤T _B ≤31-T _proc,1 。

For example, except [ n+1, n+31-T _proc,1 ]A set of predefined minimum window sizes outside, a maximum window size of 31-T _proc,1 Adding [ n+1, n+a ] 32]Wherein a is configurable from 1/2, 1/4 … …, i.e. T _B =a×32 or 31-T _proc,1

The resource selection window is in time slot [ n+T ] _B +T _proc,1 ,n+T ₂ ]Is a kind of medium. Thereafter, it is decided by the UE whether to continue continuous partial awareness and report for [ n' +t ] _proc,1 ,n+T ₂ ]Available resources on n' of the resources on. Due to T ₂ Defined by PDB, and hence the continuous perception window is also subject toTo the limit of the remaining PDBs. The perceptual window should then be at n+min (T _B ,PDB-T _proc,1 ) And (5) ending.

It is noted that although each of the schemes is described in the context of this document or section, the scheme may be applied to any other context as long as applicable.

Coordinated awareness and reporting procedures between UEs:

in inter-UE coordination for side-uplink communications, one UE, e.g., UE a, provides certain coordination information to assist another UE, e.g., UE B, in resource selection, where the coordination information may be a set of resources. According to the 3gpp RAN1 discussion, three types of resources are defined for inter-UE coordination, namely type a preferred resources, type B non-preferred resources and type C conflicting resources. The determination of these three types of resources may be obtained from the UE a's awareness process. Thus, if awareness is required, the awareness process on UE a is tied to the resource selection of UE B, which requires specification. In addition to the sensing procedure at UE a, it is also necessary to determine the information interaction between UE B and UE a.

For periodic traffic at UE B, once coordination is triggered, the transmission slots and periodicity may be forwarded from UE B to UE a in a message, e.g., if UE B explicitly triggers inter-UE coordination, then in a trigger message. The effective coordination time for UE a to provide coordination information to UE B may also be included in the message. UE a may then perform similar sensing and resource selection procedures as UE B without coordination. However, for inter-UE coordination, the timing of UE a sensing and processing differs from the sensing process at the uncoordinated UE, because UE a needs to send coordination information to UE B in time in order for UE B to reserve resources in the resource selection window.

As shown in fig. 14, when UE B triggers periodic traffic in slot n, the resource selection window of UE B is at [ n+t ₁ ,n+T ₂ ]And (3) upper part. If there is no inter-UE coordination, the sensing window of UE B is in slot [ n-T ] according to NR Rel-16 specification ₀ ,n-T _proc,0 ]On T ₂ Depending on the implementation of UE B. By coordination, to form any type of resource set within the resource selection region at UE a, resource selection windowThe port must be known at UE a. UE a then needs to know the periodicity of the resource selection at UE B, e.g. triggering the resource selection of slot n. UE a also needs to know the period T of resource selection ₂ The period may be included in the trigger message. Since the sensing is now performed at UE a, additional time is required for UE a to send a coordination message to UE B. Thus, the timing requirements of the UE a's sensing procedure are different from those of UE B's sensing procedure. For example, as shown in FIG. 14, UE A monitors time slot [ n-T ] ₀ ,n-T _r -T _proc,0 ]Wherein T is _r Is the time requirement for UE a to send a coordination message to UE B. The coordination report window is then [ n-T ] _r ,n]The coordination report window may include the processing time of the UE a transmission message. If the partial awareness is configured for power saving by higher layers or by UE B through coordination trigger messages, the awareness process of periodic traffic at UE a to UE B can be easily extended by periodic based partial awareness.

The above perception is mainly used to detect periodic traffic from other UEs. It is also important to detect non-periodic traffic, for example using continuous-based partial awareness. Since SCI can only inform resource reservation within a window of 32 slots, the entire UE coordination procedure for one transmission should be completed within 32 slots in order to benefit from coordination. On the other hand, the perceived reliability depends on the perceived window size.

For aperiodic traffic at UE B, the packet arrives at slot n as shown in fig. 15. Then, at n'>And triggering coordination at n time. The earliest time is on slot n+1. After the UE a receives the trigger message, the UE a starts to transmit in slot [ n+t ] _C,A ,n+T _C,B ]Up-sense and then in time slot [ n+T ] _C,B +T _proc,0 ,n+T _1,C -T _proc,1 ]Intra-reporting one or more coordination messages to UE B, where T _1,C Is the first time slot in the resource selection window. Also, the coordination process needs to be completed within 32 time slots. To gain further benefits from inter-UE coordination, the sensing and reporting process needs to be completed as soon as possible to ensure a specific size of the resource selection window for UE B. Thus, suggestions for configuring short perception windows mayHere for inter-UE coordination, the proposal is for example to monitor time slots [ n+1, n+a ] 32 ]Wherein a is configurable from 1/2, 1/4, etc.

FIG. 16 illustrates a block diagram of an embodiment of a processing system 1600 that may be installed in a host device for performing the methods described herein. As shown, the processing system 1600 includes a processor 1604, memory 1606, and interfaces 1610-1614, which may or may not be arranged as shown in FIG. 16. The processor 1604 may be any component or collection of components for performing computing and/or other processing related tasks, and the memory 1606 may be any component or collection of components for storing programs and/or instructions for execution by the processor 1604. In one embodiment, memory 1606 includes a non-transitory computer-readable medium. Interfaces 1610, 1612, 1614 may be any component or collection of components that support processing system 1600 in communication with other devices/components and/or users. For example, one or more of the interfaces 1610, 1612, 1614 may be used to communicate data, control, or management messages from the processor 1604 to applications installed in a host device and/or a remote device. As another example, one or more of the interfaces 1610, 1612, 1614 may be used to support a user or user device (e.g., personal computer (personal computer, PC), etc.) to interact/communicate with the processing system 1600. The processing system 1600 may include additional components not shown in fig. 16, such as long term storage elements (e.g., non-volatile memory, etc.).

In some embodiments, the processing system 1600 is included in a network device that accesses or otherwise becomes part of a telecommunications network. In one example, the processing system 1600 is located in a network side device in a wireless or wireline telecommunications network, such as a base station, relay station, scheduler, controller, gateway, router, application server, or any other device in a telecommunications network. In other embodiments, the processing system 1600 is located in a user-side device that accesses a wireless or wired telecommunications network, such as a mobile station, user Equipment (UE), personal computer (personal computer, PC), tablet, wearable communication device (e.g., smart watch, etc.), or any other device for accessing a telecommunications network.

In some embodiments, one or more of interfaces 1610, 1612, 1614 connects processing system 1600 to transceivers for sending and receiving signaling over a telecommunications network. Fig. 17 shows a block diagram of a transceiver 1700 for transmitting and receiving signaling over a telecommunications network. Transceiver 1700 may be installed in a host device. As shown, the transceiver 1700 includes a network-side interface 1702, a coupler 1704, a transmitter 1706, a receiver 1708, a signal processor 1710, and a device-side interface 1712. The network-side interface 1702 may comprise any component or collection of components for sending or receiving signaling over a wireless or wireline telecommunications network. The coupler 1704 may include any component or collection of components for facilitating bi-directional communication over the network-side interface 1702. The transmitter 1706 may include any component or collection of components (e.g., an up-converter, a power amplifier, etc.) for converting a baseband signal to a modulated carrier signal suitable for transmission through the network-side interface 1702. The receiver 1708 may include any component or collection of components (e.g., a down-converter, low noise amplifier, etc.) for converting a carrier signal received through the network-side interface 1702 to a baseband signal. The signal processor 1710 may include any component or collection of components for converting a baseband signal to a data signal suitable for communication through the device-side interface 1712 or converting a data signal to a baseband signal. The device-side interface 1712 may include any component or collection of components for communicating data signals between the signal processor 1710 and components within a host device (e.g., processing system 1600, local area network (local area network, LAN) port, etc.).

Transceiver 1700 may send and receive signaling over any type of communication medium. In some embodiments, transceiver 1700 transmits and receives signaling over a wireless medium. For example, transceiver 1700 may be a wireless transceiver for communicating according to a wireless telecommunications protocol, such as a cellular protocol (e.g., long-term evolution (LTE), etc.), a wireless local area network (wireless local area network, WLAN) protocol (e.g., wi-Fi, etc.), or any other type of wireless protocol (e.g., bluetooth, near field communication (near field communication, NFC), etc.). In these embodiments, the network-side interface 1702 includes one or more antenna/radiating elements. For example, the network-side interface 1702 may include a single antenna, multiple independent antennas, or a multi-antenna array for multi-layer communications, such as single-input multiple-output (single input multiple output, SIMO), multiple-input single-output (multiple input single output, MISO), multiple-input multiple-output (multiple input multiple output, MIMO), and so forth. In other embodiments, transceiver 1700 transmits and receives signaling over a twisted pair cable, coaxial cable, fiber optic, or other wired medium. The particular processing system and/or transceiver may utilize all of the components shown, or only a subset of these components, and the level of integration may vary from device to device.

It should be understood that one or more steps in the example methods provided herein may be performed by corresponding units or modules. For example, the signal may be transmitted by a transmitting unit or a transmitting module. The signal may be received by a receiving unit or a receiving module. The signals may be processed by a processing unit or processing module. The corresponding units/modules may be hardware, software or a combination thereof. For example, one or more of the units/modules may be an integrated circuit, such as a field programmable gate array (field programmable gate array, FPGA) or an application-specific integrated circuit (ASIC).

Although described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the disclosure as defined by the appended claims. Furthermore, the scope of the present disclosure is not intended to be limited to the particular embodiments described herein, as one of ordinary skill in the art will readily appreciate from the present disclosure, processes, machines, manufacture, compositions of matter, means, methods, or steps (including those presently existing or later to be developed) that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or steps.

While this disclosure has been described with reference to illustrative embodiments, this description is not intended to be construed in a limiting sense. Various modifications and combinations of the illustrative embodiments, as well as other embodiments of the disclosure, will be apparent to persons skilled in the art upon reference to the description. Accordingly, the appended claims are intended to cover any such modifications or embodiments.

Claims

1. A method implemented by a User Equipment (UE), the method comprising:

the UE determining a candidate resource region for data transmission, the candidate resource region indicating a candidate resource slot for the data transmission;

the UE senses by using sensing opportunities to determine available resources from the candidate resource region, wherein the sensing opportunities are determined according to the candidate resource region, the sensing period and the maximum sensing opportunity number;

the UE selects resources from the available resources; and

the UE transmits the data on the selected resources.

2. A method implemented by a User Equipment (UE), the method comprising:

The UE senses by using sensing time slots in a time slot window to determine available resources from the candidate resource area, wherein a first time slot in the sensing time slots is determined according to the first time slot in the candidate resource time slots;

the UE selects resources from the available resources; and

the UE transmits the data on the resource selected from the available resources.

3. The method of claim 2, wherein the data transmission is a periodic transmission.

4. The method of claim 2, wherein the first one of the perceived time slots is further determined based on a default number of time slots.

5. The method of claim 4, wherein the default number of slots is 31.

6. The method of any of claims 2 or 4, wherein the first one of the perceived time slots is further determined from a pre-configured number of time slots, the pre-configured number of time slots being less than the default number of time slots.

7. The method of claim 4, wherein the first one of the perceived time slots is earlier than the first one of the candidate resource regions by the default number of time slots.

8. The method of claim 6, wherein the first one of the perceived time slots is earlier than the first one of the candidate resource time slots by the preconfigured number of time slots.

9. The method of claim 2, wherein the data transmission is an aperiodic transmission.

10. The method of claim 2, wherein the first one of the perceived time slots is further determined based on a minimum perceived time slot number, the minimum perceived time slot number being a default value.

11. The method of claim 10, wherein the first one of the perceived time slots is at least the minimum perceived time slot number earlier than the first one of the candidate resource time slots.

12. The method of claim 10, wherein the default value is 31.

13. The method of claim 2, wherein the first one of the perceived time slots is at least a minimum perceived time slot number earlier than the first one of the candidate resource time slots, the minimum perceived time slot number being a preconfigured value in a range of values.

14. A method implemented by a User Equipment (UE), the method comprising:

the UE perceives by using a perceiving time slot to determine available resources from the candidate resource region, wherein the perceiving is according to the candidate resource region and a perceiving window size;

the UE compares a ratio of the available resources to a threshold, wherein the threshold is a function of the perceived window size;

the UE selecting resources from the available resources in response to the ratio being greater than the threshold; and

the UE transmits the data on the selected resources.

15. The method as recited in claim 14, further comprising:

the UE increases the perceived window size in response to the ratio being less than the threshold.

16. The method according to any one of claims 14 or 15, further comprising:

the UE increases the threshold in response to the increased perceived window size.

17. The method of claim 14, wherein the selecting comprises: the UE selects a plurality of candidate resources based on a difference between a first time slot of a first reserved resource and a second time slot of a second reserved resource being less than a value.

18. The method of claim 14, wherein the ratio is determined based on the number of available resources and the total number of candidate resources.

19. A method implemented by a User Equipment (UE), the method comprising:

the UE determining a candidate resource region for periodic data transmission, the candidate resource region indicating a candidate resource slot for the periodic data transmission;

the UE calculates the channel busy rate according to the perception in the channel busy rate measurement window; and

the UE selects a resource selection method according to the channel busy rate and a threshold value, wherein the resource selection method is one of sensing selection or random selection.

20. The method of claim 19, wherein the channel busy rate is a ratio of subchannels measured by the UE for which a side-link signal strength exceeds a second threshold of perceived signal strength over the channel busy rate measurement window.

21. The method as recited in claim 19, further comprising:

Selecting a resource from the candidate resource region, wherein the selecting includes randomly selecting the resource within a specified time in response to the UE determining that the resource selection method is the random selection.

22. The method of claim 21, wherein the specified time of the random selection is a fixed value.

23. The method of claim 21, wherein the specified time of the random selection is a random value within a range.

24. A method for side-link data transmission, the method comprising:

the first UE perceives using a perceived time slot having a first perceived window size for a first candidate resource region including candidate resources for data transmission by the second UE;

the first UE determining a preferred or non-preferred set of resources in the first candidate resource region for the data transmission by the second UE;

the first UE selecting resources from a second candidate resource region having a second perceived window size, the second candidate resource region containing second candidate resources for transmitting the preferred or non-preferred set of resources to the second UE, wherein a last time slot of the second candidate resource region is determined from the first candidate resource region; and

The first UE transmits the preferred or non-preferred set of resources to the second UE for transmission by the second UE on selected resources.

25. The method of claim 24, wherein the last time slot of the second candidate resource region is earlier than the first time slot of the first candidate resource region by a number of time slots determined by a subcarrier spacing.

26. The method of claim 24, wherein the last time slot of the second candidate resource region is earlier than the first time slot of the first candidate resource region by a processing time for resource selection.

27. The method of claim 24, wherein the last time slot of the second candidate resource region is earlier than the first time slot of the first candidate resource region for processing perceived and resource selection processing time.

28. The method of claim 24, wherein the second perceived window size is based on a first time slot of the first candidate resource region.

29. The method according to any of claims 24 or 28, wherein the last time slot of a second perception window is earlier than the first time slot of the first candidate resource region for processing perceived and resource selection processing time.

30. A User Equipment (UE), comprising:

a non-transitory memory including instructions; and

one or more processors in communication with the non-transitory memory, the one or more processors executing the instructions to:

determining a candidate resource region for data transmission, the candidate resource region indicating a candidate resource slot for the data transmission;

sensing by using sensing opportunities to determine available resources from the candidate resource region, wherein the sensing opportunities are determined according to the candidate resource region, the sensing period and the maximum sensing opportunity number;

selecting a resource from the available resources; and

the data is transmitted on the selected resource.

31. A User Equipment (UE), comprising:

a non-transitory memory including instructions; and

sensing using sensing timeslots within a timeslot window to determine available resources from the candidate resource region, wherein a first one of the sensing timeslots is determined from a first one of the candidate resource timeslots;

Selecting a resource from the available resources; and

transmitting the data on the resource selected from the available resources.

32. The UE of claim 31, wherein the data transmission is a periodic transmission.

33. The UE of claim 31, wherein the first one of the perceived time slots is further determined according to a default number of time slots.

34. The UE of claim 33, wherein the default number of slots is 31.

35. The UE of any of claims 31 or 33, wherein the first one of the perceived timeslots is further determined from a pre-configured number of timeslots, the pre-configured number of timeslots being less than the default number of timeslots.

36. The UE of claim 33, wherein the first one of the perceived timeslots is earlier than the first one of the candidate resource regions by the default number of timeslots.

37. The UE of claim 35, wherein the first one of the perceived time slots is earlier than the first one of the candidate resource time slots by the preconfigured number of time slots.

38. The UE of claim 31, wherein the data transmission is an aperiodic transmission.

39. The UE of claim 31, wherein the first one of the perceived time slots is further determined based on a minimum perceived time slot number, the minimum perceived time slot number being a default value.

40. The UE of claim 39, wherein the first one of the perceived time slots is earlier than the first one of the candidate resource time slots by at least the minimum perceived time slot number.

41. The UE of claim 39, wherein the default value is 31.

42. The UE of claim 31, wherein the first one of the perceived time slots is at least a minimum perceived time slot number earlier than the first one of the candidate resource regions, the minimum perceived time slot number being a preconfigured value in a range of values.

43. A User Equipment (UE), comprising:

a non-transitory memory including instructions; and

Sensing using a sensing time slot to determine available resources from the candidate resource region, wherein the sensing is based on the candidate resource region and a sensing window size;

comparing the ratio of the available resources to a threshold, wherein the threshold is a function of the perceived window size;

selecting a resource from the available resources in response to the ratio being greater than the threshold; and

the data is transmitted on the selected resource.

44. The UE of claim 43, wherein the one or more processors are further to execute the instructions to:

the perceived window size is increased in response to the ratio being less than the threshold.

45. The UE of any of claims 43 or 44, wherein the one or more processors are further to execute the instructions to:

the threshold is increased in response to the increased perceived window size.

46. The UE of claim 43, wherein the selection of resources comprises: the UE selects a plurality of candidate resources based on a difference between a first time slot of a first reserved resource and a second time slot of a second reserved resource being less than a value.

47. The UE according to claim 43, wherein the ratio is determined based on the number of available resources and the total number of candidate resources.

48. A User Equipment (UE), comprising:

a non-transitory memory including instructions; and

determining a candidate resource region for periodic data transmission, the candidate resource region indicating a candidate resource slot for the periodic data transmission;

calculating a channel busy rate from the perceived channel busy rate within a channel busy rate measurement window; and

and selecting a resource selection method according to the channel busy rate and the threshold value, wherein the resource selection method is one of a perception selection or a random selection.

49. The UE of claim 48, wherein the channel busy rate is a ratio of subchannels measured by the UE for which a side-link signal strength exceeds a second threshold of signal strength perceived over the channel busy rate measurement window.

50. The UE of claim 48, wherein the one or more processors are further to execute the instructions to:

And selecting a resource from the candidate resource region, wherein the resource selection method includes randomly selecting the resource within a specified time in response to the UE determining that the resource selection method is the random selection.

51. The UE as recited in claim 50, wherein the specified time of the random selection is a fixed value.

52. The UE as recited in claim 50, wherein said specified time of said random selection is a random value within a range.

53. A User Equipment (UE), comprising:

a non-transitory memory including instructions; and

sensing using a sensing time slot having a first sensing window size for a first candidate resource region including candidate resources for data transmission by a second UE;

determining a preferred or non-preferred set of resources in the first candidate resource region for the data transmission by the second UE;

selecting resources from a second candidate resource region having a second perceived window size, the second candidate resource region containing candidate resources for transmitting the preferred or non-preferred set of resources to the second UE, wherein a last time slot of the second candidate resource region is determined from the first candidate resource region; and

The preferred or non-preferred set of resources is transmitted to the second UE for transmission by the second UE on selected resources.

54. The UE of claim 53, wherein the last slot of the second candidate resource region is earlier than the first slot of the first candidate resource region by a number of slots determined by a subcarrier spacing.

55. The UE of claim 53, wherein the last slot of the second candidate resource region is earlier than a first slot of the first candidate resource region for processing time for resource selection.

56. The UE of claim 53, wherein the last slot of the second candidate resource region is earlier than a first slot of the first candidate resource region for processing time for processing awareness and resource selection.

57. The UE of claim 53, wherein the second perceived window size is based on a first time slot of the first candidate resource region.

58. The UE of any of claims 53 or 57, wherein the last slot of a second sensing window is earlier than the first slot of the first candidate resource region for processing sensing and resource selection.