Energy-saving resource selection process for NR V2X UEs with limited power

Abstract

A UE apparatus for NR V2X Mode 2 resource selection is provided. The UE apparatus includes a transceiver; and a processor configured to identify a sensing window and a resource selection window, monitor sidechain control information (SCI) transmitted from neighboring UEs in the sensing window, determine resources for transmitting data in the resource selection window, and transmit data via the transceiver using the determined resources. The sensing window includes an authorized sensing duration for detecting non-periodic traffic before transmission by the transceiver.

Description

[0001] Cross-references to related applications

[0002] This application is based on and claims priority to U.S. Provisional Patent Applications Nos. 63 / 171,376, 63 / 161,639, 63 / 127,497, 63 / 089,762, and 63 / 049,733, filed with the United States Patent and Trademark Office on April 6, 2021, March 16, 2021, December 18, 2020, October 9, 2020, and July 9, 2020, respectively, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure generally relates to new radio (NR) vehicle-to-everything (V2X) enhancements, and more specifically, to mode 2 resource selection for use by user equipment (UE). Background Technology

[0004] In NR V2X, UEs can use Mode 2 resource selection to choose resources for transmission. In Mode 2, the UE establishes a sensing window and a resource selection window. Within the sensing window, all UEs not transmitting need to monitor all sub-channels to detect sidelink control information (SCI) transmitted by their neighbors. Once an SCI is detected, its reference signal received power (RSRP) is measured, and the resource set can be considered occupied in future time slots (within the resource selection window) based on the measurement results. The SCI can indicate up to two future resources (i.e., sub-channels and time slots) and the periodicity of periodic transmissions.

[0005] Subsequently, the sensing UE can identify the set of occupied resources in its resource selection window in order to avoid these resources. However, although this conventional process has advantages in reducing collisions (i.e. interference), it still requires each UE to continuously monitor all sub-channels to identify occupied resources, thus consuming a significant amount of power.

[0006] While such high power consumption is acceptable for vehicle UEs that typically have ample power, it is generally unfeasible for pedestrian UEs (PUEs) with limited power budgets. For example, a PUE is expected to sleep for extended periods to conserve power and then wake up to perform transmissions, thus having limited or no sensing capabilities. In this document, the terms "PUE" and "limited-power UE" are used interchangeably.

[0007] Similar behavior has been observed in Long Term Evolution (LTE), and therefore, the resource selection process therein has been updated to include partial sensing and random resource selection to save power. However, while random resource selection and partial sensing may have advantages for LTE, these methods offer limited protection against collisions between neighboring UEs. Therefore, these methods are not suitable for NR V2X applications, which are expected to require more stringent reliability and latency requirements compared to LTE-based counterparts.

[0008] Furthermore, unlike LTE, NR PUEs are expected to receive messages from their neighboring UEs, and therefore are expected to listen while other PUEs are transmitting. However, PUEs are also expected to have limited sensing opportunities in order to conserve power.

[0009] Although they are simple, random resource selection and partial sensing can also be detrimental to performance due to conflicts; especially when PUE does not perform enough sensing to allow preemption and resource reselection.

[0010] Additionally, random resource selection and local sensing may require the PUE to sense through a large bandwidth portion (BWP), which could also increase power consumption.

[0011] Therefore, there is a need for technologies that allow UEs to reduce their sensing duration while still avoiding conflicts with neighboring UEs. Summary of the Invention

[0012] Therefore, this disclosure is designed to at least address the problems and / or disadvantages described above and to at least provide the advantages described below.

[0013] This disclosure provides a technique for improving Mode 2 resource selection in NR V2X to accommodate energy-efficient UEs.

[0014] Another aspect of this disclosure is to provide a UE with a technique for using partial sensing and random resource selection to save its limited power while still avoiding potential conflicts with neighboring UEs.

[0015] Another aspect of this disclosure is to provide a method for a PUE to perform an initial transmission on a subset of limited resources and indicate a limited power state in the SCI.

[0016] Another aspect of this disclosure is to provide a preemption technique for reducing the power burden on power-saving UEs.

[0017] Another aspect of this disclosure is to provide a technique for using authorized sensing duration to avoid conflicts with non-periodic business.

[0018] According to aspects of this disclosure, a user equipment (UE) apparatus is provided. The UE apparatus includes a transceiver; and a processor configured to identify a sensing window and a resource selection window, in which sidechain control information (SCI) transmitted by a neighboring UE is monitored in the sensing window, and in the resource selection window, resources for transmitting data are determined, and data is transmitted via the transceiver using the determined resources. The sensing window includes an authorized sensing duration for detecting aperiodic traffic prior to transmission by the transceiver. Attached Figure Description

[0019] Some embodiments of the present disclosure will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0020] Figure 1 The illustration shows a timeline of examples providing partial sensing.

[0021] Figure 2 This is a flowchart illustrating the resource selection process in Mode 2;

[0022] Figure 3 The illustration shows periodic reservations for sensing and transmission according to an embodiment;

[0023] Figure 4 The illustration shows periodic reservations for sensing and transmission according to an embodiment;

[0024] Figure 5 The illustration shows a reduced subchannel reservation for initial transmission according to an embodiment;

[0025] Figure 6 The illustration shows an SCI transmission performed by a UE according to an embodiment;

[0026] Figure 7 An example of authorized sensing duration according to an embodiment is illustrated;

[0027] Figure 8 An example of a reduced accessible / monitored BWP for power saving and collision reduction according to an embodiment is illustrated; and

[0028] Figure 9 An electronic device in a network environment according to an embodiment is illustrated. Detailed Implementation

[0029] In the following description, various embodiments of this disclosure will be described in detail with reference to the accompanying drawings. It should be noted that although the same elements are shown in different figures, these same elements will be indicated by the same reference numerals. In the following description, specific details (such as detailed configurations and components) are provided only to aid in an overall understanding of the embodiments of this disclosure. Therefore, it will be apparent to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope of this disclosure. Furthermore, for clarity and brevity, descriptions of well-known functions and constructions have been omitted. The terminology described below is defined in consideration of the functions in this disclosure and may vary depending on the user, the user's intent, or habits. Therefore, the definition of the terminology should be determined based on the content throughout this specification.

[0030] This disclosure can have various modifications and embodiments, which are described in detail below with reference to the accompanying drawings. However, it should be understood that this disclosure is not limited to these embodiments, but includes all modifications, equivalents, and substitutions within the scope of this disclosure.

[0031] Although terms including ordinal numbers (such as first, second, etc.) can be used to describe various elements, structural elements are not bound by these terms. These terms are used only to distinguish one element from another. For example, a first structural element may be referred to as a second structural element without departing from the scope of this disclosure. Similarly, a second structural element may also be referred to as a first structural element. As used herein, the term "and / or" includes any and all combinations of one or more related terms.

[0032] The terminology used herein is for describing various embodiments of this disclosure only and is not intended to limit the disclosure. Unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In this disclosure, it should be understood that the terms “comprising” or “having” indicate the presence of features, quantities, steps, operations, structural elements, components, or combinations thereof, and do not preclude the presence or possibility of the addition of one or more other features, numbers, steps, operations, structural elements, components, or combinations thereof.

[0033] Unless otherwise defined, all terms used herein shall have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains. Terms (such as those defined in a general dictionary) shall be interpreted as having the same meaning as in the context of the relevant field, and shall not be interpreted as having an ideal or overly formal meaning unless expressly defined in this disclosure.

[0034] The electronic device according to the embodiments can be one of a variety of types of electronic devices. Electronic devices may include, for example, portable communication devices (e.g., smartphones), computers, portable multimedia devices, portable medical devices, cameras, wearable devices, or home appliances. According to embodiments of this disclosure, the electronic device is not limited to the electronic devices described above.

[0035] The terminology used in this disclosure is not intended to limit the disclosure, but rather to include various variations, equivalents, or substitutions of corresponding embodiments. Regarding the description of the drawings, similar reference numerals may be used to refer to similar or related elements. Unless the relevant context clearly indicates otherwise, the singular form of a noun corresponding to an item may include one or more of the things. As used herein, terms such as “A or B,” “at least one of A and B,” “at least one of A or B,” “A, B, or C,” “at least one of A, B, and C,” and “at least one of A, B, or C” may include all possible combinations of items listed together in corresponding phrases. As used herein, terms such as “first,” “second,” “first,” and “second” may be used to distinguish a corresponding component from another component, but are not intended to limit the component in other respects (e.g., importance or order). If an element (e.g., the first element) is referred to as “coupled to”, “coupled to”, “connected to”, or “connected to” another element (e.g., the second element) with or without the terms “operably” or “communicatively”, it indicates that the element can be coupled to the other element directly (e.g., via a wire), wirelessly, or via a third element.

[0036] As used herein, the term "module" can include units implemented in hardware, software, or firmware, and is used interchangeably with other terms such as "logic," "logic block," "component," and "circuit system." A module can be a single integrated component, or its smallest unit or part, adapted to perform one or more functions. For example, a module can be implemented as an application-specific integrated circuit (ASIC).

[0037] Figure 1 The illustration shows a timeline of examples that provide partial sensing.

[0038] Unfortunately, these processes are not currently used in NR V2X. Furthermore, some sensing was developed for LTE, which is primarily for periodic services, and therefore not easily adaptable to NR, which can accommodate non-periodic services.

[0039] To address the shortcomings mentioned above, a work item (WI) discussion was initiated for NR V2X Rel-17 to make it more suitable for devices with limited power. Specifically, the following WI was proposed at RAN meeting #86:

[0040] ●Enhanced resource allocation:

[0041] ○ Specify resource allocation to reduce power consumption of UE [RAN1, RAN2]

[0042] ■ The baseline is to introduce the principles of random resource selection and partial sensing of the Rel-14 LTE sidechain into the Rel-16 NR sidechain resource allocation mode 2.

[0043] ■Note: Using Rel-14 as a baseline does not preclude the introduction of new solutions to reduce power consumption in cases where the baseline fails to function properly.

[0044] 1. Mode 2 resource allocation in NR Rel-16

[0045] In resource allocation mode 2, the higher layer can request the UE to determine a subset of resources from which the higher layer selects resources for Physical Sidechain Shared Channel (PSSCH) / Physical Sidechain Control Channel (PSCCH) transmission. To trigger this process, in time slot n, the higher layer provides the following parameters for this PSSCH / PSCCH transmission:

[0046] - The resource pool to report resources;

[0047] -L1 priority, prio TX ;

[0048] - Remaining packet delay budget;

[0049] - The number of sub-channels used for PSSCH / PSCCH transmission in the time slot, L subCH ;and

[0050] -Optionally, the resource reservation interval P in milliseconds. rsvp_TX .

[0051] The following higher-level parameters will affect this process:

[0052] -t2min_SelectionWindow: For prio TX Given a value, the internal parameter T 2min It is set to the corresponding value from the higher-level parameter t2min_SelectionWindow.

[0053] -SL-ThresRSRP_pi_pj: This higher-level parameter is for each combination (p i p j Provides the RSRP threshold, where p i It is the value of the priority field in the received SCI format 0-1, and p jThis refers to the priority of resource transmission selected by the UE; for a given call in this procedure, p j =prio TX .

[0054] -RSforSensing selects whether the UE uses PSSCH-RSRP or PSCCH-RSRP measurement results, as defined in sub-clause 8.4.2.1.

[0055] -reservationPeriodAllowed

[0056] -t0_SensingWindow: The internal parameter T0 is defined as the number of time slots corresponding to t0_SensingWindow ms.

[0057] Resource reservation interval P rsvp_TX (If provided) Convert from ms units to logical time slot units, thereby generating P′ rsvp_TX ,and This represents the set of time slots that can belong to the sidechain resource pool.

[0058] Figure 2 This is a flowchart illustrating the resource selection process in Mode 2.

[0059] refer to Figure 2 :

[0060] Step 1. Select candidate single time slot resources R for transmission x，y Defined in time slot L with sub-channels x+j subCH A set of interconnected sub-channels, where j = 0, ..., L subCH -1. The UE should assume that the corresponding resource pool includes L within the time interval [n+T1, n+T2]. subCH Any set of connected subchannels corresponds to a candidate single time slot resource, where the selection of T1 is in the condition 0 ≤ T1 ≤ T proc，1 The following depends on the UE implementation, where T proc，1 For TBD; if T 2min If T2 is shorter than the remaining packet delay budget (in the time slot), then T2 depends on the time T. 2min UE implementation where T2 ≤ (in the time slot) the remaining packet budget; otherwise, T2 is set to the remaining packet delay budget (in the time slot). The total number of candidate single time slot resources is determined by M. total express.

[0061] Step 2. The sensing window is defined by time slots [n-T0, nT] proc，0 The range of ) is defined, where T0 is as defined above and T proc，0For TBD. The UE should monitor time slots that belong to the sidechain resource pool, excluding the time slots where its own transmission occurs, within the sensing window. The UE should perform the actions in the following steps based on the decoded PSCCH and measured RSRP in these time slots.

[0062] Step 3. Set the internal parameter Th(p) i ) is set to p from the higher-level parameter SL-ThresRSRP_pi_pj. j equals prio TX The given value and each priority value p i The corresponding value.

[0063] Step 4. Set S A Initialize as a set of all candidate single-slot resources.

[0064] Step 5. If set S A If all of the following conditions are met, then the UE should be from this set S. A Exclude any candidate single-slot resource R x，y :

[0065] a. The UE has not yet monitored the time slot in step 2.

[0066] b. Any periodic value allowed by the higher-level parameter reservationPeriodAllowed and in time slots. The received hypothetical SCI format 0-1 (where the “Resource Reservation Period” field is set to that periodic value and indicates all sub-channels of the resource pool in this time slot) will satisfy condition c in step 6.

[0067] Step 6. If set S A If all of the following conditions are met, then the UE should be from this set S. A Exclude any candidate single-slot resource R x，y :

[0068] a.UE in time slot The system receives SCI formats 0-1, and the "Resource Reservation Period" field (if present) and "Priority" field of the received SCI formats 0-1 indicate values ​​R respectively. rsvp_RX Sum of values ​​prio RX ;

[0069] b. The RSRP measurement result performed according to the received SCI format 0-1 is higher than Th(prio) RX );

[0070] c. For q = 1, 2, ..., Q and j = 0, 1, ..., C resel-1, in the time slot The received SCI format is assumed to be in the time slot if and only if the "Resource Reservation Period" field exists in the received SCI format 0-1. The same SCI format received in the middle is determined and A set of overlapping resource blocks and time slots. Here, P′ rsvp_RX P is converted to logical time slot units rsvp_RX If P rsvp_RX <T scal And n′-m≤P′ rsvp_RX ,So Where, if time slot n belongs to set So Otherwise time slot In time slot n, the set belongs to the set. The first time slot afterwards; otherwise Q = 1. T scal It's TBD.

[0071] Step 7. If set S A The number of remaining candidate single time slot resources is less than 0.2 M. total Then for each priority value Th(p) i ) will Th(p i Increase by 3dB, and the process continues from step 4.

[0072] Step 8. The UE should report set S to the higher layer. A The remaining portion, and the higher layers then randomly select candidate resources for transmission.

[0073] 2. Mode 2 resource selection process based on partial sensing / randomness in LTE V2X If some sensing is configured by a higher layer, then use the following steps:

[0074] 1) The candidate single subframe resource R used for PSSCH transmission x，y Defined in subframe L with sub-channels x+j subCH A set of interconnected sub-channels, where j = 0, ..., L subCH -1. The UE shall, through its implementation, determine a set of subframes consisting of at least Y subframes within the time interval [n+T1, n+T2], where if T 2min (prio TX ) By higher levels targeting prio TX If T1 and T2 are provided, then the choice between T1 and T2 depends on T1 ≤ 4 and T 2min (prio TxUE implementation under T2 ≤ 100, otherwise 20 ≤ T2 ≤ 100. UE selection for T2 should meet the delay requirement and Y should be greater than or equal to the higher-layer parameter minNumCandidateSF. The UE should assume that the corresponding PSSCH resource pool (described in 14.1.5) within the determined set of the subframe includes L subCH Any set of connected subchannels corresponds to a candidate single subframe resource. The total number of candidate single subframe resources is M. total express.

[0075] 2) If in step 1, the subframe If included in the subframe set, then with the k-th bit of the higher-layer parameter gapCandidateSensing set to 1, the UE should monitor any subframe. The UE should perform the following actions based on the PSCCH decoding and Received Signal Strength Indication (RSSI) measured in these subframes.

[0076] 3) Set parameter Th a，b Set to the value indicated by the i-th SL-ThresPSSCH-RSRP field in the SL-ThresPSSCH-RSRP list, where i = a*8 + b + 1.

[0077] 4) Set S A Initialize as the union of all candidate single subframe resources. Set S B Initialize to an empty set.

[0078] 5) If set S A If all of the following conditions are met, then the UE should be selected from the set S. A Exclude any candidate single subframe resource R x，y :

[0079] 1. - UE in subframe The system receives SCI format 1, and according to sub-clause 14.2.1, the “Resource Reservation” and “Priority” fields in the received SCI format 1 respectively indicate the value P. rsvp_RX Sum of values ​​prio RX .

[0080] 2. - The PSSCH-RSRP measurement results based on the received SCI format 1 are higher than...

[0081] 3. - For q = 1, 2, ..., Q and j = 0, 1, ..., C resel -1, in subframe The SCI format received in the subframe or assumed to be in the subframe The same SCI format 1 received in the middle is determined according to 14.1.1.4C to be the same as... A set of overlapping resource blocks and subframes. Here, if P rsvp_RX <1 and y′-m≤P step ×P rsvp_RX +P step ,So in, It is the last subframe among Y subframes, otherwise Q=1.

[0082] 6) If set S A The number of remaining candidate single subframe resources is less than 0.2M. total So, when Th a，b Repeat step 4 if the increase is 3dB.

[0083] 7) For set S A The remaining candidate single subframe resources R x，y , will measure E x，y Defined as subchannel x+k (k=0、...、L) in the monitoring subframe in step 2 subCH The linear average of the S-RSSI measured in -1), for non-negative integer j, the monitoring subframe can be obtained from... express.

[0084] 8) The UE will have the minimum metric E x，y Candidate single subframe resource R x，y From set S A Move to S B Repeat this step until set S is reached. B The number of candidate single subframe resources becomes greater than or equal to 0.2·M. total until.

[0085] 9) When the UE is configured by the upper layer to transmit on multiple carriers using a resource pool, if the UE does not support transmission in the candidate single subframe resource of a carrier under the assumption that it is transmitting on other carriers using already selected resources (due to limitations in the number of carriers it can transmit on simultaneously, limitations in the combinations of carriers it supports, or interruptions in RF retuning time), then the UE should select from the S B Excluding candidate single subframe resources R x，y The UE will report set S to the higher layer. B .

[0086] When the random-selection transmission is configured by the upper layer and the UE is configured by the upper layer to transmit using a resource pool on multiple carriers, the following steps are used:

[0087] 1) The candidate single subframe resource R used for PSSCH transmissionx，y Defined in subframe L with sub-channels x+j subCH A set of interconnected sub-channels, where j = 0, ..., L subCH -1. The UE should assume that the corresponding PSSCH resource pool (described in 14.1.5) within the time interval [n+T1, n+T2] includes L subCH Any set of connected subchannels corresponds to a candidate single subframe resource, where if TTX 2min From a higher level targeting prio TX Given that T1 and T2 are chosen when T1 ≤ 4 and The choice depends on the UE implementation; otherwise, 20 ≤ T2 ≤ 100. The UE selection for T2 should meet the latency requirements. The total number of candidate single subframe resources is determined by M. total express.

[0088] 2) Set S A Initialize it as the union of all candidate single subframe data. Set S B Initialize to an empty set.

[0089] 3) The UE will select a single subframe resource R x，y From set S A Move to S B .

[0090] 4) If the UE does not support transmission in the candidate single subframe resource of a carrier under the assumption that it is transmitting on other carriers using already selected resources (due to limitations in the number of carriers it can transmit simultaneously, limitations in the combinations of carriers it supports, or interruptions in RF retuning time), then the UE should select from the S B Excluding candidate single subframe resources R x，y The UE will report set S to the higher layer. B .

[0091] Enhanced preemption process for some sensing UEs

[0092] According to embodiments of this disclosure, a UE with a limited power budget can perform special periodic resource reservations. Specifically, each UE will perform two or more resource reservations in each period, whereby these two resources are separated by T or T+n time slots. T is the shortest time required for the UE to process preemption requests and relinquish resources signaled by a preemptive mechanism.

[0093] Figure 3 The illustration shows a periodic reservation for sensing and transmission according to an embodiment.

[0094] refer to Figure 3"Sensing resources" refers to the resources used to monitor preemption by the PUE, and "resources for Tx" refers to the resources used for transmission by the PUE.

[0095] In this case, two scenarios can be considered:

[0096] Scenario 1: Power-constrained UEs always perform periodic reservations regardless of whether data needs to be transmitted. In this scenario, the PUE can perform periodic reservations over extended periods to avoid wasting too many resources. Additionally, if a delay-tolerant service arrives, it can be delayed until the next transmission opportunity.

[0097] Scenario 2: Power-constrained UEs can only initiate these periodic reservations when they have traffic (periodic or non-periodic). In this scenario, the UE wakes up at each opportunity to transmit pending data. The resource reservation period does not need to match the period of the incoming traffic. Specifically, if the incoming TB is latency-tolerant, the resource reservation period does not need to be equal to the traffic period. However, if the traffic is not latency-tolerant, the resource reservation period can be chosen to match the period of the periodic traffic. If the incoming TB is greater than the periodically reserved resources (e.g., if a limited number of subchannels are reserved each period to reduce the likelihood of collisions), the PUE can also reserve additional resources in its SCI to carry the remaining payload. These reservations can be random or based on partial sensing.

[0098] like Figure 3 As illustrated, in the first resource reservation, the PUE does not transmit but instead senses the sub-channels used for SCI (i.e., resources available for use by neighboring UEs). If an SCI from a neighboring UE indicating that an upcoming resource reservation has been detected, the UE with limited power assumes that the second reservation has been preempted and does not perform a transmission. Here, constraints can be imposed on the system regarding preemption.

[0099] Specifically, a UE that needs to preempt a power-limited UE will have to send its SCI in the first resource. This can be accomplished by instructing these periodic reservations to be made by the power-limited UE and that the first one or more resources in each interval are reserved for sensing. This instruction can be done explicitly in the SCI using a flag or implicitly by setting a set of parameters to specific values. Resource preemption for each interval can also be based on a specific threshold. For example, a power-limited UE will not preempt (or relinquish) the selected resource unless the UE performing the preemption has an RSRP higher than a priority-based threshold. This threshold can also differ from the normal preemption threshold.

[0100] Furthermore, the UE performing preemption can reduce the likelihood that these resources will be selected by higher layers. Specifically, when passing a candidate resource set to higher layers, the UE can provide two subsets. The first subset has a lower probability and includes resources pre-reserved by power-constrained UEs, while the second subset has a higher probability and includes remaining resources available for selection. A potential problem with this embodiment is how to restore periodic reservations in the event of a transmission failure or preemption.

[0101] Another issue is how to maintain the reservation of resources dedicated to sensing, since SCI transfers do not occur during these times.

[0102] These problems can be solved by one or more of the following techniques:

[0103] a. When one of the TB transmission reservations is preempted, a new periodic reservation can be made.

[0104] b. If it is possible to indicate past resources similar to those in LTE, then the UE can indicate the resources used for sensing in the transmitted SCI. In this case, such periodic resources can be saved.

[0105] c. The indication is included in the SCI for special periodic reservations by a power-constrained UE. This can then be used to infer that all indicated resources will be reserved in each interval in the event of any transmission. Specifically, the power-constrained UE does not perform any transmissions on the sensed resources. However, if a transmission occurs on the reserved resources, this can indicate that the periodic reservation will continue in subsequent periods. Alternatively, it can be assumed that the UE maintains the periodic reservation for at least X periods after the last transmission. Furthermore, it can be assumed that the UE maintains the periodic reservation for Y periods after the first indication, regardless of the number of transmissions. The UE's behavior during the initial transmission can differ from its subsequent behavior. In particular, the UE can perform full sensing before initially accessing the resource. Additionally, if reverse indication is not allowed, the UE can use the first resource (i.e., the sensed resource) to send the SCI to indicate the periodic reservation of both sensed and transmission resources.

[0106] d. Preemption is expected to be sensed by a neighboring UE of a power-limited UE. In this case, if an interval is preempted, the power-limited UE can be expected to return to periodic transmission in subsequent cycles.

[0107] e. As the special reservation described above means that the initial transmission within each cycle is solely for sensing, a flag is used to indicate this behavior. This can be done explicitly using a dedicated flag or implicitly by setting some fields in the SCI to preselected values. Subsequently, it can be assumed that the resource reservation indicated by the SCI points backward to the sensing resource (i.e., backward indication similar to LTE is allowed only for this specific resource reservation). For example, an SCI received in time slot X (with an interval set to T and a period P between sensing and Tx resources) will indicate that the sensing resource is located in time slot XT, and that this sensing resource is also periodically reserved with a period P.

[0108] f. Power-constrained UEs can perform cycle-by-cycle reservations to extend their signaling window. Specifically, in each SCI, the UE uses the period field from the Phase 1 SCI to indicate a shift in its signaling window. This complements the time-frequency allocation of one or more resource reservations. For example, at slot n, the UE provides a shift equivalent to 100 slots (using the period field) and indicates that both resources are reserved at intervals equal to Z. In this case, the future reserved resources will be n+100 for sensing resources and n+100+Z for Tx resources to be used for transmission.

[0109] g. Figure 4 The illustration shows a periodic reservation for sensing and transmission according to an embodiment.

[0110] refer to Figure 4 In the event of preemption, the UE relinquishes the resources reserved for Tx and can thus complete a new reservation, as described above, in which the UE uses the period field in the Phase 1 SCI to indicate the shift of its signaling window.

[0111] Power-constrained UEs are not limited to transmitting only once per cycle. Specifically, the resources required to transmit incoming traffic may be insufficient to carry the data to be transmitted. In this case, a power-constrained UE can:

[0112] a. Stop periodic transmissions and reserve additional resources.

[0113] b. Maintain periodic transmissions, but reserve additional non-periodic resources to carry the remaining data.

[0114] c. Adjust the period of periodic transmission to allow more data to be carried.

[0115] As described above, according to embodiments of this disclosure, a UE with a limited power budget can perform periodic resource reservations, whereby in each resource reservation, two or more resources are selected such that these resources have at least T (or T+n) separate time slots. The power-constrained UE monitors preemption requests in the first reserved resource and determines whether to transmit in the second resource. When a reservation made by a neighboring UE is detected to have an RSRP higher than a certain priority-based threshold, the power-constrained UE can relinquish the second resource.

[0116] Furthermore, according to embodiments of this disclosure, in order to reduce the number of preemption attempts, the UE performing the preemption can pass the candidate resources for selection to a higher layer in two subsets. The first subset has a lower probability and includes resources that need to be preempted, while the second subset has a higher probability and includes available resources.

[0117] Reduced resource reservations for conflict mitigation

[0118] To address some issues in Mode 2 resource selection, the initial transmission is separated from subsequent transmissions. More specifically, if a UE wakes up to send data, it first reserves a limited number of sub-channels (e.g., one sub-channel). That is, reservation is performed regardless of the payload size because if the UE only attempts to access a limited number of sub-channels, the chance of collisions with neighboring UEs is generally reduced.

[0119] Figure 5 The illustration shows a reduced subchannel reservation for initial transmission according to an embodiment.

[0120] refer to Figure 5 The number of accessible subchannels in the initial transmission is limited to one, instead of the three subchannels reserved for future use, in order to reduce the chance of collisions. For example, flags in the SCI can be used to indicate the difference in the number of subchannels.

[0121] In addition to transmitting part of the payload or no payload (due to the limited number of selected sub-channels), the UE may also transmit SCI, which includes:

[0122] a. A 1-bit flag indicates that this is a single subchannel allocation that can differ from subsequent allocations. Limited subchannel reservations can be made by the UE only for initial resource reservations after the non-sensing duration. Specifically, once the UE wakes from a sleep duration where it did not perform sensing to, for example, conserve power, the UE uses a reduced subchannel reservation (i.e., one subchannel) for its initial TB transmission. However, subsequent transmissions can occupy any number of subchannels, regardless of the size of the first transmission. If the UE decides to perform more than 1TB of transmissions before returning to sleep, it may not be necessary to constrain the initial transmission of subsequent TBs to a single subchannel, considering that sufficient sensing was performed during the wake-up duration or that resources for the new TB transmissions have already been reserved by previous transmissions (e.g., periodic transmissions).

[0123] b. Future resource reservations, carrying remaining data or subsequent transmissions / retransmissions. Regardless of the initial transmission, future reservations can occupy any number of subchannels. Therefore, the subchannel size field in SCI can refer to future reservations rather than initial reservations.

[0124] c. A flag indicating blind / partial sensing-based transmission allows conflicting UEs to reserve future resources to avoid conflict, regardless of their priority. Specifically, resources reserved by a power-constrained UE may conflict with resource reservations selected or signaled by other UEs. In some scenarios, these UEs will have higher-priority traffic. Since power-constrained UEs do not perform sensing or perform limited sensing, they may be unaware of other UEs' resource reservations. Subsequently, a conflict may occur, rendering the conflicting resource useless due to interference. To avoid this, neighboring UEs can determine to reselect different resources if available. Specifically, neighboring UEs can measure the RSRP of the SCI transmitted by the power-constrained UE and thus estimate the interference to the upcoming conflicting resource. If the estimated interference is above a certain threshold, then the neighboring UE can decide to relinquish the resource and utilize a different resource, regardless of priority level. This differs from the resource reselection and preemption process in NR V2X Rel-16, which requires a UE to only relinquish its selected or signaled resource if the conflicting UE has higher-priority traffic. To allow for this preemption and resource reselection, the resources reserved by a UE with limited power can be constrained to at least T time slots from the current transmission, where T is the minimum time required to process the reselection / preemption request. That is, neighboring UEs will need at least T time slots to perform preemption / reselection to avoid potential conflicts. Additionally, the interval between the current time slot and the resource reservation that the UE with limited power is about to perform may need to be greater than T+n time slots. Subsequently, the UE with limited power should perform sensing within n time slots to allow UEs with higher priority services to indicate preemption and prevent the UE with limited power from performing its transmission to avoid potential conflicts.

[0125] According to embodiments of this disclosure, for UEs that do not perform continuous sensing (i.e., power-limited UEs), the initial transmission is constrained to a limited number of sub-channels (e.g., 1 sub-channel) in order to reduce the chance of collisions.

[0126] As described above, according to embodiments of this disclosure, unlike subsequent reservations, the SCI transmitted by a power-limited UE may include a flag indicating that the initial transmission uses a limited number of resources. For example, this type of indication of the PUE state in the SCI may be useful for avoiding conflicts with fully sensing UEs. Fully sensing UEs, due to their limited sensing capabilities, can avoid preempting PUEs regardless of priority / RSRP. Furthermore, fully sensing UEs can perform resource reselection regardless of the priority / RSRP threshold or when the RSRP is above the threshold.

[0127] Figure 6 The illustration shows an SCI transmission performed by a UE according to an embodiment.

[0128] refer to Figure 6 PSSCH 601 includes an indication of the power-limited state of the PUE in the SCI to reduce the preemption opportunity of fully sensing UEs, regardless of priority.

[0129] According to embodiments of this disclosure, SCIs transmitted by a power-constrained UE can indicate blind / partial sensing conditions. Neighboring UEs anticipating future resource conflicts / notifications can accordingly reselect their resources to avoid potential conflicts, regardless of their priority. This avoidance can only occur if the measured RSRP of the SCI transmitted by the power-constrained UE is higher than a fixed / pre-configured threshold.

[0130] Authorization sensing to avoid conflicts with non-periodic business

[0131] Before attempting to access a subchannel, a power-constrained UE may need to perform sensing for a duration equal to the signaling window. This sensing helps identify aperiodic traffic, thus limiting the chance of collisions for UEs with aperiodic reservations. Although this sensing consumes power, the amount is negligible compared to the sensing window. For example, the NR Rel-16 sensing window is currently between 100 and 1100 ms, while the signaling window is only 32 time slots. This duration can also be shortened / extended based on traffic priority. For example, higher-priority traffic with strict delay requirements can be allowed to transmit earlier to meet the packet delay budget (PDB).

[0132] According to embodiments of this disclosure, for a UE that does not perform continuous sensing due to a limited power budget, if PDB ≥ signaling window, then a sensing duration of at least equal to the signaling window can be authorized before the initial transmission.

[0133] Figure 7 An example of authorized sensing duration according to an embodiment is illustrated.

[0134] refer to Figure 7 Before attempting to access a subchannel, a power-constrained UE needs to perform sensing for a duration of 31 time slots to detect aperiodic traffic. Although the signaling window itself is 32 time slots, because the current time slot is included in the signaling window, the power-constrained UE needs to perform sensing for a duration of 31 time slots. That is, resources beyond a maximum of 31 time slots in the future can be indicated using a 32-time-slot signaling window. Therefore, the UE only needs to sense 31 time slots, since no previous time slot can indicate resources within the resource selection window.

[0135] PUE constraints on accessible BWPs to reduce collisions

[0136] Power-constrained UEs (e.g., UEs with low-priority services) may be constrained to a subset of available resources to avoid conflicts with higher-priority services. In this case, once a UE with a limited power budget is woken up, it will attempt to access a subset of system subchannels. The number of subchannels within this subset can depend on service priority.

[0137] Two approaches were considered for resource selection on this subset. In the first approach, no sensing was involved, and the UE randomly selected resources for transmission. In the second approach, the UE could perform partial sensing on a finite subset (i.e., reduced bandwidth) to save power and select resources for transmission. Before transmission, this sensing could be required to be continuous or last only a finite duration. This duration could also depend on service priority and PDB.

[0138] According to embodiments of this disclosure, a UE with a limited power budget can perform transmissions on randomly selected resources or resources selected based on partial sensing. These resources are selected from a specific subset, whereby the number of sub-channels within this subset depends on service priority.

[0139] Figure 8 An example of a reduced accessible / monitored BWP for power saving and collision reduction is illustrated according to an embodiment.

[0140] refer to Figure 8 The UE is restricted to accessing / monitoring a subset of available resources, such as a reduced BWP of only 4 sub-channels.

[0141] Figure 9 An electronic device in a network environment according to an embodiment is illustrated.

[0142] refer to Figure 9In network environment 900, electronic device 901 (e.g., a mobile terminal including GPS functionality) can communicate with electronic device 902 via a first network 998 (e.g., a short-range wireless communication network), or with electronic device 904 or server 908 via a second network 999 (e.g., a long-range wireless communication network). Electronic device 901 can communicate with electronic device 904 via server 908. Electronic device 901 may include processor 920, memory 930, input device 950, sound output device 955, display device 960, audio module 970, sensor module 976, interface 977, haptic module 979, camera module 980, power management module 988, battery 989, communication module 990, subscriber identification module (SIM) 996, or antenna module 997 including a GNSS antenna. In one embodiment, at least one of the components (e.g., display device 960 or camera module 980) may be omitted from electronic device 901, or one or more other components may be added to electronic device 901. In one embodiment, some components may be implemented as a single integrated circuit (IC). For example, a sensor module 976 (such as a fingerprint sensor, iris sensor, or illuminance sensor) may be embedded in a display device 960 (such as a display).

[0143] Processor 920 can execute software (e.g., program 940) to control at least one other component (e.g., hardware or software component) of electronic device 901 coupled to processor 920, and can perform various data processing or calculations. As at least part of data processing or calculation, processor 920 can load commands or data received from another component (e.g., sensor module 976 or communication module 990) into volatile memory 932, process the commands or data stored in volatile memory 932, and store the resulting data in non-volatile memory 934. Processor 920 may include a main processor 921 (e.g., central processing unit (CPU) or application processor) and an auxiliary processor 923 (e.g., graphics processing unit (GPU), image signal processor (ISP), sensor hub processor, or communication processor (CP)), which may operate independently of or in conjunction with the main processor 921. Additionally or alternatively, auxiliary processor 923 may be adapted to consume less power than the main processor 921 or to perform specific functions. The auxiliary processor 923 can be implemented separately from or as part of the main processor 921.

[0144] The auxiliary processor 923, when the main processor 921 is inactive (e.g., in sleep) rather than the main processor 921, or when the main processor 921 is active (e.g., executing an application), can, together with the main processor 921, control at least some functions or states associated with at least one component of the electronic device 901 (e.g., display device 960, sensor module 976, or communication module 990). According to one embodiment, the auxiliary processor 923 (e.g., an image signal processor or a communication processor) can be implemented as part of another component (e.g., a camera module 980 or communication module 990) functionally associated with the auxiliary processor 923.

[0145] The memory 930 may store various data used by at least one component of the electronic device 901 (e.g., processor 920 or sensor module 976). The various data may include, for example, input or output data of software (e.g., program 940) and associated commands. The memory 930 may include volatile memory 932 or non-volatile memory 934.

[0146] Program 940 can be stored as software in memory 930 and may include, for example, an operating system (OS) 942, middleware 944, or application 946.

[0147] Input device 950 can receive commands or data from outside electronic device 901 (e.g., a user) that will be used by other components of electronic device 901 (e.g., processor 920). Input device 950 may include, for example, a microphone, mouse, or keyboard.

[0148] The sound output device 955 can output sound signals to the outside of the electronic device 901. The sound output device 955 may include, for example, a speaker or a receiver. The speaker can be used for general purposes, such as playing multimedia or recording, and the receiver can be used to answer incoming calls. According to one embodiment, the receiver may be implemented separately from the speaker or as part of the speaker.

[0149] Display device 960 can visually provide information to the outside of electronic device 901 (e.g., a user). Display device 960 may include, for example, a display, a holographic device, or a projector, and a control circuitry system to control a corresponding one of the display, holographic device, and projector. According to one embodiment, display device 960 may include a touch circuitry system adapted to detect touch or a sensor circuitry system (e.g., a pressure sensor) adapted to measure the intensity of the force caused by touch.

[0150] The audio module 970 can convert sound into electrical signals and vice versa. According to one embodiment, the audio module 970 can acquire sound via an input device 950, or output sound via a sound output device 955 or an earphone of an external electronic device 902 that is directly (e.g., wired) or wirelessly coupled to the electronic device 901.

[0151] Sensor module 976 can detect the operating state of electronic device 901 (e.g., power or temperature) or the environmental state outside electronic device 901 (e.g., user state), and then generate an electrical signal or data value corresponding to the detected state. Sensor module 976 may include, for example, a gesture sensor, gyroscope sensor, atmospheric pressure sensor, magnetic sensor, accelerometer, grip sensor, proximity sensor, color sensor, infrared (IR) sensor, biometric sensor, temperature sensor, humidity sensor, or illuminance sensor.

[0152] Interface 977 may support one or more specified protocols for direct (e.g., wired) or wireless coupling between electronic device 901 and external electronic device 902. According to one embodiment, interface 977 may include, for example, a High Definition Multimedia Interface (HDMI), a Universal Serial Bus (USB) interface, a Secure Digital Card (SD) interface, or an audio interface.

[0153] Connection terminal 978 may include a connector through which electronic device 901 can be physically connected to external electronic device 902. According to one embodiment, connection terminal 978 may include, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (e.g., a headphone connector).

[0154] The tactile module 979 can convert electrical signals into mechanical stimulation (e.g., vibration or movement) or electrical stimulation, which can be recognized by a user via touch or kinesthesia. According to one embodiment, the tactile module 979 may include, for example, a motor, a piezoelectric element, or an electrical stimulator.

[0155] The camera module 980 can capture still or moving images. According to one embodiment, the camera module 980 may include one or more lenses, an image sensor, an image signal processor, or a flash.

[0156] The power management module 988 can manage the power supplied to the electronic device 901. The power management module 988 can be implemented as at least part of, for example, a power management integrated circuit (PMIC).

[0157] The battery 989 can supply power to at least one component of the electronic device 901. According to one embodiment, the battery 989 may include, for example, a non-rechargeable primary battery, a rechargeable secondary battery, or a fuel cell.

[0158] Communication module 990 can support the establishment of a direct (e.g., wired) or wireless communication channel between electronic device 901 and external electronic devices (e.g., electronic device 902, electronic device 904, or server 908), and communication can be performed via the established communication channel. Communication module 990 may include one or more communication processors that can operate independently of processor 920 (e.g., application processor) and support direct (e.g., wired) or wireless communication. According to one embodiment, communication module 990 may include wireless communication module 992 (e.g., cellular communication module, short-range wireless communication module, or Global Navigation Satellite System (GNSS) communication module) or wired communication module 994 (e.g., local area network (LAN) communication module or power line communication (PLC) module). A corresponding one of these communication modules can communicate via a first network 998 (e.g., a short-range communication network, such as Bluetooth). TM The communication module 992 can communicate with external electronic devices via a wireless communication module 993 (such as a Wi-Fi Direct or Infrared Data Association (IrDA) standard) or a second network 999 (such as a remote communication network, such as a cellular network, the Internet, or a computer network (such as a LAN or a wide area network (WAN)). These various types of communication modules can be implemented as a single component (such as a single IC) or as multiple components that are separate from each other (such as multiple ICs). The wireless communication module 992 can use subscriber information (such as International Mobile Subscriber Identity (IMSI)) stored in the subscriber identification module 996 to identify and authenticate electronic devices 901 in the communication network (such as a first network 998 or a second network 999).

[0159] Antenna module 997 can transmit or receive signals or power to or from the outside of electronic device 901 (e.g., external electronic device). According to one embodiment, antenna module 997 may include one or more antennas, from which at least one suitable communication scheme for use in a communication network (such as a first network 998 or a second network 999) can be selected, for example, by communication module 990 (e.g., wireless communication module 992). Signals or power can then be transmitted or received between communication module 990 and external electronic device via the selected at least one antenna.

[0160] At least some of the components described above can be coupled to each other and transmit signals (e.g., commands or data) therebetween via inter-peripheral communication schemes (e.g., bus, general purpose input and output (GPIO), serial peripheral interface (SPI) or mobile industrial processor interface (MIPI)).

[0161] According to one embodiment, commands or data can be transmitted or received between electronic device 901 and external electronic device 904 via server 908 coupled to a second network 999. Each of electronic devices 902 and 904 can be a device of the same or different type as electronic device 901. All or some operations to be performed at electronic device 901 can be performed at one or more of the external electronic devices 902, 904, or 908. For example, if electronic device 901 is required to automatically perform a function or service, or in response to a request from a user or another device, then instead of or in addition to performing the function or service, electronic device 901 can request one or more external electronic devices to perform at least a portion of the function or service. The one or more external electronic devices receiving the request can perform at least a portion of the requested function or service, or additional functions or services related to the request, and transmit the result of the performance to electronic device 901. Electronic device 901 can provide the result as at least part of a response to the request, with or without further processing of the result. For this purpose, cloud computing, distributed computing, or client-server computing technologies can be used, for example.

[0162] One embodiment may be implemented as software (e.g., program 940) including one or more instructions stored in a storage medium (e.g., internal memory 936 or external memory 938) readable by a machine (e.g., electronic device 901). For example, a processor of electronic device 901 may invoke at least one of the one or more instructions stored in the storage medium and execute the instructions under the control of the processor, with or without one or more other components. Thus, the machine is operable to perform at least one function according to the invoked at least one instruction. The one or more instructions may include code generated by a compiler or code executable by an interpreter. A machine-readable storage medium may be provided in the form of a non-transitory storage medium. The term "non-transitory" indicates that the storage medium is a tangible device and does not include signals (e.g., electromagnetic waves), but this term does not distinguish between cases where data is semi-permanently stored in the storage medium and cases where data is temporarily stored in the storage medium.

[0163] According to one embodiment, the methods of this disclosure may be included and provided in a computer program product. The computer program product may be traded as a product between a seller and a buyer. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., an optical disc read-only memory (CD-ROM)) or via an app store (e.g., the Play Store). TMOnline distribution (e.g., downloading or uploading) or direct distribution between two user devices (e.g., smartphones). If distributed online, at least a portion of the computer program product can be temporarily generated and stored at least temporarily in a machine-readable storage medium (such as the memory of a manufacturer's server, an app store's server, or a relay server).

[0164] According to one embodiment, each component (e.g., a module or program) described above may include a single entity or multiple entities. One or more of the components described above may be omitted, or one or more other components may be added. Alternatively or additionally, multiple components (e.g., modules or programs) may be integrated into a single component. In this case, the integrated component can still perform one or more functions of each of the multiple components in the same or similar manner as if each of the multiple components had performed one or more functions of each of the multiple components prior to integration through a corresponding component. Operations performed by a module, program, or other component may be performed sequentially, in parallel, repeatedly, or heuristically, or one or more of the operations may be performed in a different order or omitted, or one or more other components may be added.

[0165] As described above, embodiments of this disclosure include:

[0166] 1) Allows the PUE to perform its initial transmission on a limited number of sub-channels, thereby reducing its collision probability;

[0167] 2) Reduce the preemption probability of PUE through SCI indication, thereby reducing the power used for sensing associated with resource selection;

[0168] 3) Reduce latency of power-saving UEs by decreasing the preemption probability;

[0169] 4) Reduce the sensing burden on PUE by reducing the monitoring duration of PUE for preemption;

[0170] 5) Reduce conflicts between some sensing UEs and their neighbors' non-periodic service reservations by authorizing the sensing duration prior to transmission; and

[0171] 6) Save PUE power by requiring PUE to monitor and use only a subset of available BWPs.

[0172] Although certain embodiments of this disclosure have been described in the detailed description thereof, this disclosure may be modified in various forms without departing from its scope. Therefore, the scope of this disclosure should not be determined solely on the described embodiments, but rather on the appended claims and their equivalents.

Claims

1. A user equipment (UE) device, the UE device comprising: transceiver; as well as The processor is configured as follows: Identify multiple periodic sensing windows. Monitor periodic services within the periodic sensing window. Identify the non-periodic sensing window and resource selection window. During the aperiodic sensing window, sidechain control information (SCI) transmitted by neighboring UEs is monitored. Monitor aperiodic services within the aperiodic sensing window. In the resource selection window, determine the resources used for data transmission, and Data is transmitted via the transceiver using the determined resources. The aperiodic sensing window includes an authorized sensing duration for detecting the aperiodic service before it is transmitted by the transceiver. The authorized sensing duration is included in or shorter than the non-periodic sensing window, and Wherein, in response to the packet delay budget (PDB) being greater than or equal to the signaling window, the authorized sensing duration is at least equal to the signaling window prior to the initial transmission.

2. The UE device according to claim 1, wherein, The processor is also configured to modify the authorized sensing duration based on the service priority of the data.

3. A user equipment (UE) device, the UE device comprising: transceiver; and The processor is configured as follows: Identify the sensing window and resource selection window. The sidechain control information (SCI) transmitted by a neighboring UE is monitored within the sensing window. In the resource selection window, determine the resources used for data transmission, and Data is transmitted via the transceiver using the determined resources. The sensing window includes an authorized sensing duration for detecting non-periodic traffic before it is transmitted by the transceiver. The authorized sensing duration is based on the packet delay budget (PDB) and is included in or shorter than the sensing window. Wherein, in response to the packet delay budget (PDB) being greater than or equal to the signaling window of the UE, the authorized sensing duration is at least equal to the signaling window of the UE prior to the initial transmission.

4. The UE device according to claim 1, wherein, The processor is also configured to monitor the SCI through a reduced bandwidth portion (BWP) of available resources during the aperiodic sensing window.

5. The UE device according to claim 4, wherein, The processor is also configured to determine the reduced BWP based on the service priority of the data.

6. The UE device according to claim 4, wherein, The processor is also configured to determine the reduced BWP based on the PDB.

7. The UE device according to claim 1, wherein, The processor is also configured to determine the resource for transmitting the data by randomly selecting the resource from the reduced bandwidth portion (BWP) of the available resources.

8. The UE device according to claim 7, wherein, The processor is also configured to determine the reduced BWP based on the service priority of the data.

9. The UE device according to claim 7, wherein, The processor is also configured to determine the reduced BWP based on the PDB.

10. The UE device according to claim 1, wherein, The processor is also configured to determine the resources for transmitting the data by reserving a first number of sub-channels for an initial transmission and a second number of sub-channels for each subsequent transmission, wherein the first number of sub-channels is less than the second number of sub-channels.

11. The UE device according to claim 10, wherein, The processor is also configured to transmit SCI including an indication of the use of the second sub-channel number.

12. The UE device according to claim 11, wherein, The indication includes a flag indicating the difference between the number of the first sub-channels and the number of the second sub-channels.

13. The UE device according to claim 11, wherein, The time between the initial transmission and the first subsequent transmission is greater than or equal to T, where T is the shortest time required to process a reselection or preemption request.

14. The UE device according to claim 1, wherein, The processor is also configured to transmit an indication as a power-limited UE to the neighboring UE in the SCI, and The instruction is used by one of the neighboring UEs to avoid preempting the UE device and to perform resource reselection.

15. The UE device according to claim 1, wherein, The processor is also configured to perform periodic reservations of at least two resources.

16. The UE device according to claim 15, wherein, The processor is also configured to: Monitor the SCI in the first reserved resource, and A second reserved resource is determined as the resource for transmitting the data.

17. The UE device according to claim 16, wherein, The processor is also configured to, in response to receiving an SCI indicating from a neighboring UE that the second reserved resource has been reserved by the neighboring UE, not to use the second reserved resource to transmit the data.

18. The UE device according to claim 16, wherein, The processor is also configured to: Abandon the second reserved resource, and New resources are reserved for transmitting the data.

19. The UE device according to claim 15, wherein, The time between the at least two resources is greater than or equal to T, where T is the shortest time required to process a reselection or preemption request.

20. The UE device according to claim 1, wherein, The processor is also configured to determine the resource for transmitting the data by selecting the resource from the reduced bandwidth portion (BWP) of available resources based on partial sensing.

Images