Resource selection method, device and system

Abstract

According to an embodiment of the present invention, there is provided a resource selection method, an apparatus and a system, adapted for a transmitting device, which transmits sidelink data to a receiving device, the receiving device being configured for sidelink discontinuous reception (SL DRX), the method comprising the steps of: the transmitting device generating a first candidate resource set and a second candidate resource set, the first candidate resource set being a set of all candidate resources within a period of overlap between a selection window of the transmitting device and at least one consecutive SL DRX active time in the selection window of the receiving device; the transmitting device determining candidate resources available for sidelink data transmission in the first candidate resource set and the second candidate resource set, respectively; and the transmitting device selecting resources for a first predetermined number of transmissions among the candidate resources available for sidelink data transmission in the first candidate resource set and selecting resources for a remaining number of transmissions among the candidate resources available for sidelink data transmission in the second candidate resource set.

Description

[Technical field]

[0001] FIELD OF THE DISCLOSURE The present invention relates to the field of communications technology. [Background technology]

[0002] In the existing standard, a discontinuous reception (DRX) may be configured on the Uu link for the terminal device to enable the terminal device to save power. A semi-static periodically operating timer may be configured for the terminal device, which is called drx-OnDurationTimer, and within the operation period of this timer, the terminal device needs to perform blind detection on the downlink control channel (PDCCH). In the remaining time, the terminal device may not detect the PDCCH and may turn off the receiving radio frequency depending on the implementation to save power.

[0003] Meanwhile, in addition to the semi-static periodic DRX mechanism, Uu DRX introduces a timer that operates based on an event trigger, and when a condition is met, the terminal device can dynamically transition to an active state to perform blind detection on the PDCCH. Specifically, the terminal device may be dynamically activated according to drx-RetransmissionTimerDL or drx-RetransmissionTimerUL configured for each HARQ process to detect the PDCCH for scheduling retransmission in the downlink (DL) and uplink (UL), respectively. Based on the above Uu DRX operation mechanism, the terminal device can be activated at the time when the network device may schedule retransmission, and it can be ensured that the terminal device can detect and receive the PDCCH for scheduling retransmission.

[0004] The above description of the background art is merely for the purpose of more clearly and completely explaining the configurations of the present invention and for the understanding of those skilled in the art, and should not be construed as meaning that these configurations are well known to those skilled in the art just because they are described in the background art of the present invention. Summary of the Invention [Problem to be solved by the invention]

[0005] According to the discovery of the inventors of the present invention, in Rel-16 NR V2X (New Radio V2X (vehicle to everything) Release 16), for Mode 2 (mode 2: terminal autonomously selects transmission resource), the transmission resource of the terminal device is obtained through the process of sensing and resource selection. That is, the terminal needs to obtain the resource occupancy status of the entire resource pool through the sensing process and select the appropriate resource to transmit the data packet.

[0006] Meanwhile, the Rel-17 sidelink enhancement task further extends sidelink transmission based on NR (New Radio) technology, and one of its important goals is to research and design a power saving mechanism for terminal devices in sidelink for some terminal devices, such as mobile terminal devices (P-UE). The DRX mechanism is an efficient power saving mechanism applied to the Uu interface and can be reused as a baseline in sidelink. However, if the receiving device is configured with SL DRX, the transmitting device needs to consider the configuration of the SL DRX to ensure that the receiving device is in SL DRX active state when transmitting data. Otherwise, the receiving device will not be able to receive and correctly decode the transmitted data packets.

[0007] Therefore, when the transmitting device is operating in Mode 2 mode, it is necessary to extend the existing resource selection process to ensure that the time corresponding to the resource selected by the transmitting device is within the SL DRX active time of the receiving device, as shown in Fig. 1, and to avoid packet drops due to the receiving device not being in a receiving state. Meanwhile, it is necessary to avoid a decrease in reliability due to the introduction of SL DRX, as shown in Fig. 2.

[0008] In view of at least one of the above problems, embodiments of the present invention provide a resource selection method, apparatus and system. [Means for solving the problem]

[0009] In one aspect of an embodiment of the present invention, there is provided a resource selection apparatus configured in a first terminal device, the first terminal device transmitting sidelink data to a second terminal device, the second terminal device being configured for sidelink discontinuous reception (SL DRX), the apparatus including: a generation unit configured to generate a first candidate resource set and a second candidate resource set, the first candidate resource set being a set of all candidate resources within a period in which a selection window of the first terminal device overlaps with at least one consecutive SL DRX active time in the selection window of the second terminal device; a determination unit configured to determine candidate resources available for sidelink data transmission in the first candidate resource set and candidate resources available for sidelink data transmission in the second candidate resource set, respectively, to obtain a first candidate resource subset and a second candidate resource subset; and a selection unit configured to select resources in the first candidate resource subset for transmitting a first predetermined number of transmissions of sidelink data and to select resources in the second candidate resource subset for transmitting a remaining number of transmissions of sidelink data.

[0010] In another aspect of an embodiment of the present invention, there is provided a resource selection device configured in a first terminal device, the first terminal device transmitting sidelink data to a second terminal device, the second terminal device being configured for discontinuous reception, the device comprising: a generation unit for generating a third candidate resource set; a determination unit for determining candidate resources available for sidelink data transmission in the third candidate resource set and obtaining a third candidate resource subset; and a selection unit for selecting resources for transmitting sidelink data in the third candidate resource subset, the third candidate resource subset including candidate resources other than all candidate resources preceding a predetermined time unit in a selection window of the first terminal device, the predetermined time unit meaning a first slot in which the selection window of the first terminal device overlaps with a first consecutive SL DRX active time in the selection window of the second terminal device or a next consecutive SL DRX active time after a start of the selection window.

[0011] Another aspect of an embodiment of the present invention provides a resource selection device configured in a first terminal device, the first terminal device transmitting sidelink data to a second terminal device, the second terminal device being configured for discontinuous reception, the device including a selection unit configured to select a transmission resource in a candidate resource subset for transmitting the sidelink data, the selection unit initially selecting one transmission resource in the candidate resource subset, the one transmission resource being selected in a candidate resource period in which a selection window of the first terminal device overlaps with a consecutive SL DRX active time in the selection window of the second terminal device, and the selection unit then selecting remaining transmission resources in the candidate resources in the candidate resource subset other than a candidate resource preceding a predetermined time unit of the selection window of the first terminal device, the predetermined time unit meaning a first slot in which the selection window of the first terminal device overlaps with a consecutive SL DRX active time of the second terminal device in which the initially selected transmission resource is located.

[0012] One of the advantageous effects of the embodiment of the present invention is as follows: According to the enhanced resource selection mechanism of the transmitting device, when the receiving device is configured with SL DRX, it can ensure that the transmitting device can transmit data packets during the active period of the SL DRX of the receiving device, and can avoid the occurrence of a situation where the receiving device cannot receive and decode data packets due to being in an inactive state, so as to ensure the reliability of data packet transmission.

[0013] As shown in the following description and drawings, specific embodiments of the present invention are disclosed in detail to show how the principles of the present invention can be employed. However, the scope of the embodiments of the present invention is not limited to these. The embodiments of the present invention include modifications, alterations, and equivalents within the spirit and scope of the appended claims.

[0014] Features described and / or illustrated in one embodiment may be used in the same or similar manner in one or more other embodiments and may be combined with or substituted for features in the other embodiments.

[0015] It should be noted that in this text, the term "including / having" means the presence of a feature, element, step or component, and does not exclude the presence or addition of one or more other features, elements, steps or components. [Brief description of the drawings]

[0016] Elements and features depicted in one drawing and one embodiment of the present invention may be combined with elements and features shown in one or more drawings or embodiments, and in the drawings, like reference numerals may designate corresponding elements in multiple drawings and may designate corresponding elements used in more than one embodiment. [Figure 1] FIG. 13 is a schematic diagram of data packet dropping when SL DRX is configured in the receiving device. [Diagram 2]FIG. 13 is a schematic diagram of reliability degradation when SL DRX is configured in the receiving device. [Diagram 3] FIG. 2 is a schematic diagram of an application scenario of an embodiment of the present invention; [Figure 4] 1 is a schematic diagram of unnecessary power consumption due to transmission resources being limited to the operating period of the OnDurationTimer; [Diagram 5] FIG. 2 is a schematic diagram of a resource selection method according to an embodiment of the present invention; [Figure 6] FIG. 2 is a schematic diagram of an example of a first candidate resource set and a second candidate resource set. [Figure 7] FIG. 11 is a schematic diagram of another example of a first candidate resource set and a second candidate resource set. [Figure 8] FIG. 2 is a schematic diagram of an example of partial sensing. [Figure 9] FIG. 2 is a schematic diagram of a resource selection method according to an embodiment of the present invention; [Figure 10] FIG. 2 is a schematic diagram of the location of excluded resources. [Figure 11] FIG. 13 is a schematic diagram illustrating a case where the start position of a selection window of a first terminal device is delayed. [Figure 12] FIG. 13 is a schematic diagram of an example of a case where consecutive SL DRX active times of a receiving device overlap with a selection window of a transmitting device. [Figure 13] FIG. 13 is a schematic diagram of another example where consecutive SL DRX active times of a receiving device and a selection window of a transmitting device overlap. [Figure 14] FIG. 2 is a schematic diagram of a resource selection method according to an embodiment of the present invention; [Figure 15] 2 is a schematic diagram of an example of resource selection performed by a transmitting device according to a method of an embodiment of the present invention. [Figure 16] FIG. 2 is a schematic diagram of a data transmission method according to an embodiment of the present invention; [Figure 17] FIG. 2 is a schematic diagram of a resource selection device according to an embodiment of the present invention; [Figure 18] FIG. 2 is another schematic diagram of a resource selection device according to an embodiment of the present invention; [Figure 19] FIG. 2 is another schematic diagram of a resource selection device according to an embodiment of the present invention; [Figure 20] 1 is a schematic diagram of a data transmission device according to an embodiment of the present invention; [Figure 21] FIG. 2 is a schematic diagram of a terminal device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] The above and other features of the present invention will become apparent from the following description. In the specification and drawings, specific embodiments of the present invention are disclosed in detail, and some of the embodiments in which the principles of the present invention can be adopted are shown. However, the present invention is not limited to the described embodiments. The present invention includes all modifications, variations, and equivalents within the scope of the appended claims. Each embodiment of the present invention will be described below with reference to the drawings. These embodiments are merely illustrative and do not limit the present invention.

[0018] In embodiments of the present invention, the terms "first", "second", etc. are used in the title to distinguish different elements, but do not represent the spatial arrangement or temporal order of these elements, and these elements are not limited to these terms. The term "and / or" includes any and all combinations of one or more of the terms listed in the associated list. The terms "including", "comprising", "having", etc. refer to the presence of listed features, elements, elements or components, but do not exclude the presence or addition of one or more other features, elements, elements or components.

[0019] In the embodiments of the present invention, the singular forms "a", "the", etc., include the plural forms and should be understood broadly as "one kind" or "a class", and are not limited to "one". In addition, the term "said" should be understood to include both the singular and the plural forms, unless the context clearly indicates otherwise. In addition, the term "described in" should be understood to mean "described at least in part", and the term "based on" should be understood to mean "based at least in part on", unless the context clearly indicates otherwise.

[0020] In an embodiment of the present invention, the term "communication network" or "wireless communication network" may refer to a network conforming to any communication standard, such as, for example, Long Term Evolution (LTE), Advanced Long Term Evolution (LTE-A, LTE-Advanced), Wideband Code Division Multiple Access (WCDMA), High-Speed ​​Packet Access (HSPA), etc.

[0021] Additionally, communications between devices in a communication system may occur according to any stage of communication protocols, including, but not limited to, 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G, and 5G, New Radio (NR), and / or other currently known or future developed communication protocols.

[0022] In the embodiment of the present invention, the term "network device" refers to a device in a communication system, for example, allowing a terminal device to access the communication system and providing a service to the terminal device. The network device may include, but is not limited to, a base station (BS), an access point (AP), a transmission reception point (TRP), a broadcast transmitter, a mobility management entity (MME), a gateway, a server, a radio network controller (RNC), a base station controller (BSC), etc.

[0023] Among them, the base station may include, but is not limited to, a Node B (NodeB or NB), an evolved Node B (eNodeB or eNB), and a 5G base station (gNB), etc., as well as a Remote Radio Head (RRH), a Remote Radio Unit (RRU), a relay, or a low power node (e.g., femto, pico, etc.). Also, the term "base station" may include some or all of the functions thereof, and each base station may provide communication coverage for a particular geographic area. The term "cell" may refer to a base station and / or its coverage area depending on the context in which the term is used.

[0024] In the embodiment of the present invention, the term "User Equipment" (UE) or "Terminal Equipment" (TE) refers to an apparatus that accesses a communication network and receives a network service via, for example, a network device. The terminal apparatus may be fixed or mobile, and may be called a mobile station (MS), a terminal, a subscriber station (SS), an access terminal (AT), a station, etc.

[0025] Among them, the terminal device may include, but is not limited to, a mobile phone, a personal digital assistant (PDA), a wireless modulation / demodulation device, a wireless communication device, a handheld device, a machine-type communication device, a laptop computer, a cordless phone, a smartphone, a smart watch, a digital camera, and the like.

[0026] For example, in a scenario such as the Internet of Things (IoT), the user equipment may be a monitoring or measuring device or equipment, including, but not limited to, a Machine Type Communication (MTC) terminal, an in-vehicle communication terminal, a Device to Device (D2D) terminal, a Machine to Machine (M2M) terminal, etc.

[0027] Furthermore, the term "network side" or "network device side" refers to the side of a network, which may be a base station or may include one or more of the network devices mentioned above. The term "user side" or "terminal side" or "terminal device side" refers to the side of a user or terminal, which may be a UE or may include one or more of the terminal devices mentioned above. In this specification, unless otherwise specified, "device" may refer to a network device or may refer to a terminal device.

[0028] The following describes an embodiment scenario of the present invention with reference to an example, but the present invention is not limited thereto.

[0029] Fig. 3 is a schematic diagram of an application scenario of an embodiment of the present invention. As shown in Fig. 3, in this scenario, a transmitting device (Tx UE) operates in mode 2, a receiving device (Rx UE) is configured with SL DRX, and the transmitting device transmits data packets to the receiving device by unicast. Note that, although a unicast scenario is described as an example in Fig. 3, the present invention is not limited thereto, and the embodiment of the present invention may be applied to a groupcast scenario or a broadcast scenario.

[0030] In the 112-e meeting of RAN2 (Radio Access Network Group 2), it has been agreed that, at least for unicast scenarios, the timer-based mechanism in the Uu interface is reused to control the SL DRX behavior mechanism of the receiver, i.e., the drx-OnDurationTimer, drx-InactivityTimer, drx-HARQ-RTT-Timer and drx-RetransmissionTimer are used in the sidelink to control the SL DRX mechanism of the receiver. Some companies have proposed that after performing SL DRX configuration for the receiver or obtaining the SL DRX configuration of the receiver, when the transmitter performs resource selection, the selected resources should all be within the operation period of the drx-OnDurationTimer of the receiver, thereby ensuring that the receiver is always in an active state when transmitting a data packet. The drawback of this method is that if the transmitting device supports a larger number of retransmissions (up to 32 for NR V2X), the drx-OnDurationTimer value must be configured to a larger value, but since this timer operates semi-statically and periodically, such services may not always be present (e.g., may be aperiodic), which may cause unnecessary extra power consumption. Figure 4 is a schematic diagram of unnecessary power consumption due to transmission resources being limited to the operation period of the OnDurationTimer.

[0031] According to the discovery of the inventor of the present invention, in SL, resource reservation can be indicated by SCI (Sidelink Control Information), so that the transmitting device only needs to ensure that the first transmission (or the first few transmissions) is within the operation period of the drx-OnDurationTimer of the receiving device, which operates semi-statically and periodically, and for the remaining few transmissions, the receiving device may reserve or dynamically start the drx-RetransmissionTimer in the SL DRX active state according to the indication of SCI. In this way, the receiving device can ensure correct reception and decoding of data packets, and does not obviously reduce reliability and does not generate extra power consumption. According to such a scheme, the transmitting device needs to extend the existing resource selection process to ensure that the selected resources meet the requirements.

[0032] In addition, in the existing resource selection process, the resource selection process is completed by the physical layer and the MAC layer together, where the physical layer of the terminal device first generates a candidate resource set, and then excludes some candidate resources that are unavailable for sidelink transmission to obtain a candidate resource subset, which includes the candidate resources available for sidelink data transmission in the candidate resource set, and the physical layer of the terminal device reports the candidate resource subset to the MAC (medium access control) layer, and the MAC layer selects resources from the reported candidate resource subset to transmit sidelink data. For a specific process, refer to Section 8.1.4 of 3GPP technical specification TS38.214-g40.

[0033] Hereinafter, examples of the present invention will be described with reference to the drawings and specific embodiments.

[0034] <Example 1> An embodiment of the present invention provides a resource selection method, which is described from the first terminal device side. The first terminal device may transmit sidelink data to a second terminal device, and the second terminal device is configured with SL DRX. Here, the SL DRX configuration may be configured for the second terminal device by a network device, may be pre-configured, may be configured for the second terminal device by the first terminal device, or may be configured for itself by the second terminal device according to its own power saving requirement, but the present invention is not limited thereto. Also, from the viewpoint of sidelink data transmission, the first terminal device in the embodiment of the present invention is a transmitting device, and the second terminal device is a receiving device.

[0035] 5 is a schematic diagram of a resource selection method according to an embodiment of the present invention. As shown in FIG. 5, the method includes the following steps:

[0036] Step 501: A first terminal device generates a first candidate resource set and a second candidate resource set, where the first candidate resource set is a set of all candidate resources in a period in which the selection window of the first terminal device overlaps with at least one consecutive SL DRX active time in the selection window of the second terminal device.

[0037] Step 502: The first terminal device determines candidate resources available for sidelink data transmission in the first candidate resource set and candidate resources available for sidelink data transmission in the second candidate resource set, respectively, to obtain a first candidate resource subset and a second candidate resource subset.

[0038] Step 503: The first terminal device selects resources in the first candidate resource subset for transmitting a first predetermined number of transmissions of sidelink data, and selects resources in the second candidate resource subset for transmitting the remaining number of transmissions of sidelink data.

[0039] It should be noted that the above FIG. 5 only shows a schematic diagram of an embodiment of the present invention, but the present invention is not limited thereto. For example, the execution order between various steps may be appropriately adjusted, some other steps may be added, and some steps may be removed. Those skilled in the art may make appropriate modifications based on the above content, and are not limited to the description of the above FIG. 5.

[0040] In the prior art, the physical layer selects one candidate resource set S A Generates only S A Unlike reporting one candidate resource subset to the MAC layer, in the embodiment of the present invention, the physical layer reports two candidate resource sets, namely, the first candidate resource set S A1 and a second candidate resource set S A2 Then, the MAC layer generates S separately, determines available candidate resources for sidelink data transmission from the S, obtains two candidate resource subsets, and reports them to the MAC layer, respectively. A1 It is possible to ensure that there are a sufficient number of candidate resources that can be randomly selected in the candidate resource subset corresponding to the above, it is possible to ensure as much as possible that the transmission resource for the first transmission selected by the transmitting device overlaps with the active time of the SL DRX of the receiving device, and it is possible to reduce the power consumption of the receiving device as much as possible.

[0041] In an embodiment of the present invention, during the time overlapping with the consecutive SL DRX active time of the second terminal device, the retransmission mode of the first terminal device is blind retransmission, and the retransmission mode during the remaining time is retransmission by HARQ-ACK, where the transmission resources used by the first terminal during the consecutive active SL DRX active time of the second terminal device include, but are not limited to, resources selected from the first candidate resource subset.

[0042] In an embodiment of the present invention, in step 501, the consecutive SL DRX active time in the selection window of the first terminal device of the second terminal device is at least one consecutive slot. The consecutive at least one slot may be an operation period of a discontinuous reception duration timer (drx-OnDurationTimer) in the sidelink of the second terminal device, an operation period of a discontinuous reception inactivity timer (drx-InactivityTimer) in the sidelink of the second terminal device, an operation period of a discontinuous reception retransmission timer (drx-RetransmissionTimer) in the sidelink of the second terminal device, or a combination of operation periods of one or more of the above three sidelink timers. In other words, the above active time in the selection window of the first terminal device of the second terminal device may be an operation period of one or more of the above three sidelink timers.

[0043] It should be noted that in the embodiments of the present invention, the names of the sidelink timers mentioned above are merely exemplary, and the present invention is not limited thereto, and other names may be used for the above three sidelink timers.

[0044] In some aspects, when a selection window of a first terminal device overlaps with consecutive SL DRX active times in the selection window of a second terminal device, the first candidate resource set is the set of all candidate resources within the overlapping period.

[0045] In some aspects, when the selection window of a first terminal device overlaps with two or more consecutive SL DRX active times in the selection window of a second terminal device, the first candidate resource set is a set of all candidate resources within a period in which the selection window of the first terminal device overlaps with all consecutive SL DRX active times in the selection window of the second terminal device, or the first candidate resource set is a set of all candidate resources within a period in which the selection window of the first terminal device overlaps with the first consecutive SL DRX active time in the selection window of the second terminal device or the next consecutive SL DRX active time after the start of the selection window.

[0046] In the above aspect, each successive SL DRX active time of the second terminal device in the selection window of the first terminal device may be defined as one sub-selection window. That is, the sub-selection window means a period in which the selection window of the first terminal device and each successive SL DRX active time in the selection window of the second terminal device overlap. In this case, the first candidate resource set may be a set of all candidate resources in a first sub-selection window in the selection window of the first terminal device, or may be a set of all candidate resources in all sub-selection windows in the selection window of the first terminal device.

[0047] In the embodiment of the present invention, in some aspects, the second candidate resource set may be a set of remaining candidate resources other than the first candidate resource set in the selection window of the first terminal device, or may be a set of all candidate resources in the selection window of the first terminal device, or may be a set of remaining candidate resources other than the first candidate resource set in the selection window of the first terminal device and the candidate resources a predetermined time unit before in the selection window of the first terminal device, or may be a set of remaining candidate resources other than the candidate resources a predetermined time unit before in the selection window of the first terminal device. The predetermined time unit means the first slot where the selection window of the first terminal device overlaps with the first consecutive SL DRX active time in the selection window of the second terminal device or the next consecutive SL DRX active time after the start of the selection window of the second terminal device.

[0048] FIG. 6 is a schematic diagram of an example of a first candidate resource set and a second candidate resource set. As shown in FIG. 6, in this example, the first candidate resource set (S A1 ) is a set of all candidate resources in a period in which the selection window (n+T1→n+T2, n is a slot in which the upper layer of the first terminal device notifies the physical layer of resource selection related parameters) of the first terminal device overlaps with the first consecutive SL DRX active time in the selection window of the second terminal device, and the second candidate resource set (S A2 ) is a set of remaining candidate resources other than the previous candidate resources of a predetermined time unit in the selection window of the first terminal device, where the predetermined time unit is the first slot where the selection window of the first terminal device overlaps with the first consecutive SL DRX active time in the selection window of the second terminal device.

[0049] 7 is a schematic diagram of another example of a first candidate resource set and a second candidate resource set. Different from the example of FIG. 6, in the example of FIG. 7, when each successive SL DRX active time of the second terminal device in the selection window of the first terminal device is defined as one sub-selection window, the first candidate resource set (S A1 ) is the set of all candidate resources in the first sub-selection window (sub-selection window 1) in the selection window of the first terminal device, and the second candidate resource set (S A2 ) is a set of remaining candidate resources other than the previous candidate resources of a predetermined time unit in the selection window of the first terminal device, where the predetermined time unit is the first slot where the selection window of the first terminal device overlaps with the first consecutive SL DRX active time in the selection window of the second terminal device.

[0050] In an embodiment of the present invention, in step 501, the upper layer of the first terminal device may notify the physical layer of parameters for generating the two candidate resource sets. In addition, the parameters notified by the upper layer of the first terminal device to the physical layer may be notified respectively to generate the two candidate resource sets, and the values ​​of the parameters may be respectively configured and different. Thus, the physical layer can generate the two candidate resource sets respectively using different parameters notified by the upper layer.

[0051] For example, the physical layer of the first terminal device receives transmission parameters for the first candidate resource set and transmission parameters for the second candidate resource set notified by the upper layer of the first terminal device. Here, the transmission priority (prio) in the transmission parameters for the first candidate resource set is notified by the upper layer of the first terminal device. TX ) is smaller than the transmission priority value in the transmission parameters for the second candidate resource set (a smaller priority value indicates a higher priority), and / or the subchannel (L) for transmission of sidelink data (PSSCH) in the slot in the transmission parameters for the first candidate resource set is smaller than the transmission priority value in the transmission parameters for the second candidate resource set (a smaller priority value indicates a higher priority), and / orsubCH ) may be greater than or less than the number of subchannels for transmission of sidelink data in a slot in the transmission parameters for the second candidate resource set.

[0052] In an embodiment of the present invention, in step 502, a first candidate resource set S A1 and a second candidate resource set S A2 After the initialization is completed, the two candidate resource sets independently perform resource exclusion (i.e., determine which candidate resources are available for sidelink data transmission in the two candidate resource sets) to obtain two candidate resource subsets, i.e., a first candidate resource subset and a second candidate resource subset. Note that the parameters for performing resource exclusion for the two candidate resource sets may be the same or different.

[0053] In some aspects, the resource exclusion methods of the two candidate resource sets may refer to Section 8.1.4 of 3GPP Technical Specification TS 38.213 Release G40 until the candidate resource sets meet the conditions on remaining resources in Section 8.1.4 of TS 38.213. In this manner, the physical layer of the first terminal device may report the two candidate resource subsets obtained by excluding resources to the upper layer (MAC layer).

[0054] In another aspect, the resource exclusion method of the second candidate resource set may refer to clause 8.1.4 of TS 38.213, but the resource exclusion method of the first candidate resource set may use different parameters than the resource exclusion method of the second candidate resource set.

[0055] For example, a reference signal received power (RSRP) threshold used to perform resource exclusion for a first candidate resource set (i.e., to determine available candidate resources for sidelink data transmission in the first candidate resource set and obtain a first candidate resource subset) is smaller than a reference signal received power (RSRP) threshold used to perform resource exclusion for a second candidate resource set (i.e., to determine available candidate resources for sidelink data transmission in the second candidate resource set and obtain a second candidate resource subset). A1 In the resource elimination process, the RSRP threshold is A2 For example, the threshold may be offset by -3 dB or -ndB from the threshold used for the first transmission. This has the advantage that the reliability of the first transmission can be improved to some extent.

[0056] Also, for example, a transmission priority value used for performing resource exclusion for a first candidate resource set (i.e., determining available candidate resources for sidelink data transmission in the first candidate resource set and obtaining a first candidate resource subset) is smaller than a transmission priority value used for performing resource exclusion for a second candidate resource set (i.e., determining available candidate resources for sidelink data transmission in the second candidate resource set and obtaining a second candidate resource subset). A1 Transmission priority prio TX The value of S is smaller than the actual transmission priority. A2 The transmission priority used for S is higher than the actual transmission priority advertised by the MAC. A1 A smaller priority value indicates a higher priority.

[0057] Furthermore, for example, the reporting ratio (X%) for a first candidate resource set of the same priority is greater than the corresponding value for a second candidate resource set.

[0058] In an embodiment of the present invention, in step 503, after receiving the two candidate resource subsets reported by the physical layer, the upper layer of the first terminal device may select resources for a predetermined number of transmissions (first predetermined number) for transmitting sidelink data in a subset (first candidate resource subset) of the first candidate resource set, and select resources for a remaining number of transmissions for transmitting sidelink data in a subset (second candidate resource subset) of the second candidate resource set, where the remaining number is a number obtained by subtracting the first predetermined number from the target number. The target number is determined by the MAC layer based on a parameter range of the RRC configuration and a channel congestion degree (CBR) of the current resource pool.

[0059] For example, the procedure regarding resource selection in TS 38.321 of 3GPP may be modified as follows.

[0060] [Table 1] In some aspects, the number of transmission resources selected by the first terminal device in the first candidate resource subset may be predefined, or may be determined by the total number of selected transmissions and / or the length of time that the second terminal device is in the SL DRX active state in the PDB corresponding to the transmission block (TB), or the ratio of the length of time to the total length of the time, or may be determined taking into account the priority of the packet and / or the result of a measured channel busy ratio (CBR). Here, the higher the priority of the data packet, the more resources need to be selected in the subset (first candidate resource subset) of the first candidate resource set, and the more transmissions there will be. The larger the CBR, the fewer resources need to be selected in the subset (first candidate resource subset) of the first candidate resource set, and the fewer transmissions there will be. The above is merely an example, and specifically, the number of transmission resources selected by the first terminal device in the first candidate resource subset may be determined based on at least one of the above factors, or may be determined based on other factors, or may be determined in combination with other factors, but the present invention is not limited thereto.

[0061] For example, the total number of transmissions and the length or ratio of active time may be obtained by a lookup table to obtain the number of times transmissions are performed using resources included in the corresponding first candidate resource subset, i.e., each value of the total number of transmissions and each length or ratio of active time corresponds to a value of the number of times transmissions are performed using resources included in the first candidate resource subset.

[0062] In an embodiment of the present invention, in some aspects, an upper layer of a first terminal device may notify its physical layer of a parameter indicating the SL DRX configuration of a second terminal device, which may be one or more parameters, and which may indicate or to some extent indicate the SL DRX configuration of the second terminal device.

[0063] In the above aspect, the physical layer of the first terminal device receives a parameter indicating a discontinuous reception configuration of the second terminal device notified by an upper layer of the first terminal device.

[0064] For example, the parameters may include the operation period, offset, and size of the drx-OnDurationTimer (Discontinuous Reception Duration Timer) on the sidelink, and the sizes of timers such as the drx-InactivityTimer (Discontinuous Reception Inactivity Timer) on the sidelink, the drx-HARQ-RTT-Timer (Discontinuous Reception Hybrid Automatic Retransmission Round Trip Timer) on the sidelink, and the drx-RetransmissionTimer (Discontinuous Reception Retransmission Timer) on the sidelink. Alternatively, the parameters may include only related information of the drx-OnDurationTimer on the sidelink (such as the operation period, offset, and size). The above is merely an example, and the parameters may include any combination of related information of the timers on the sidelink described above.

[0065] In an embodiment of the present invention, the sidelink timers may be configured for unicast, i.e., may be unicast specific, including an operating period, a size and an offset, and / or the sidelink timers may be configured as common timers, i.e., the configuration of the sidelink timers may be common regardless of whether the unicast transmission method or the groupcast transmission method or the broadcast transmission method is used.

[0066] In an embodiment of the present invention, the upper layer of the first terminal device may send indication information indicating the type of the second terminal device to the physical layer, and / or send indication information indicating the transmission type of the current service to the physical layer.

[0067] In the above aspect, the physical layer of the first terminal device receives indication information indicating the device type of the second terminal device and / or indication information indicating the cast type of the current service transmitted by an upper layer of the first terminal device.

[0068] The above equipment type is, for example, V-UE or P-UE, i.e., the indication information indicating the equipment type of the above second terminal equipment indicates whether the second terminal equipment is a V-UE or a P-UE.

[0069] The above transmission type is, for example, unicast, groupcast or broadcast, i.e., the indication information indicating the transmission type of the current service indicates whether the transmission type of the current service is unicast, groupcast or broadcast.

[0070] In some aspects of the present invention, when partial sensing is configured in the first terminal device, the overlap refers to an overlap between the consecutive SL DRX active times and a set of candidate slots selected by the physical layer of the first terminal device in a selection window of the first terminal device, because in the first terminal device configured with partial sensing, the selectable candidate resources are limited to a set of candidate resources in the candidate slots selected by the physical layer in a selection window of the first terminal device.

[0071] 8 is a schematic diagram of an example of partial sensing. As shown in FIG. 8, when partial sensing is configured in a first terminal device, in a selection window, only a slot at a position corresponding to a sensed slot in a sensing window is selected as a slot in which a candidate resource is located.

[0072] In an embodiment of the present invention, if the current resource selection is for multiple MAC PDUs (periodic services), the above resource selection process only restricts the resource selection for the first transmission and retransmission in the first period, and does not need to restrict the first transmission and retransmission of the subsequent periods. For example, it may be instructed via the SCI to reserve the first transmission and retransmission of the subsequent periods.

[0073] The above-mentioned embodiments are merely illustrative of the present invention, and the present invention is not limited thereto, and appropriate modifications may be made based on the above-mentioned embodiments. For example, each of the above-mentioned embodiments may be used alone, or one or more of the above-mentioned embodiments may be used in combination.

[0074] According to this embodiment, two candidate resource sets are generated, and independent resource exclusion processes are performed to obtain and report two candidate resource subsets, which can ensure that the MAC layer has a sufficient number of candidate resources that can be randomly selected in the subset of the candidate resource set, and can ensure that the transmission resource for the first transmission selected by the transmitting device overlaps with the active time of the SL DRX of the receiving device as much as possible, and can reduce the power consumption of the receiving device as much as possible.

[0075] <Example 2> An embodiment of the present invention provides a resource selection method, which is described from the first terminal device side. The first terminal device may transmit sidelink data to a second terminal device, and the second terminal device is configured with SL DRX. Here, the SL DRX configuration may be configured for the second terminal device by a network device, may be pre-configured, may be configured for the second terminal device by the first terminal device, or may be configured for itself by the second terminal device according to its own power saving requirement, but the present invention is not limited thereto. Also, from the viewpoint of sidelink data transmission, the first terminal device in the embodiment of the present invention is a transmitting device, and the second terminal device is a receiving device.

[0076] The second embodiment may be combined with the first embodiment or may be implemented independently, and the description of the same contents as those of the first embodiment will be omitted.

[0077] 9 is a schematic diagram of a resource selection method according to an embodiment of the present invention. As shown in FIG. 9, the method includes the following steps:

[0078] Step 901: The first terminal device generates a third candidate resource set.

[0079] Step 902: The first terminal device determines candidate resources available for sidelink data transmission in the third candidate resource set to obtain a third candidate resource subset.

[0080] Step 903: The first terminal device selects resources in the third candidate resource subset for transmitting sidelink data.

[0081] Wherein, the third candidate resource subset includes candidate resources other than all candidate resources before a predetermined time unit in the selection window of the first terminal device, where the predetermined time unit means the first slot where the selection window of the first terminal device overlaps with the first consecutive SL DRX active time in the selection window of the second terminal device or the next consecutive SL DRX active time after the start of the selection window.

[0082] It should be noted that the above FIG. 9 only shows a schematic diagram of an embodiment of the present invention, but the present invention is not limited thereto. For example, the execution order between various steps may be appropriately adjusted, some other steps may be added, and some steps may be removed. Those skilled in the art may make appropriate modifications based on the above content, and are not limited to the description of the above FIG. 9.

[0083] In an embodiment of the present invention, in the selection window of the transmitting device, all candidate resources before the start time of the first slot where the selection window of the transmitting device overlaps with the first or next consecutive SL DRX active time of the receiving device in the period are excluded. This restricts the transmitting device from selecting resources before the first slot where the selection window of the transmitting device overlaps with the next consecutive SL DRX active time of the receiving device. This is because such resources overlap with the non-active time of the receiving device and cannot be reserved by a previous SCI or be within a dynamic active period triggered by an SCI, so such resources are within the SL DRX inactive period of the receiving device, and if such resources are used for transmission, the receiving device will not be able to successfully receive and decode the data packets transmitted by the transmitting device.

[0084] In an embodiment of the present invention, during the time overlapping with the consecutive SL DRX active time of the second terminal device, the retransmission mode of the first terminal device is blind retransmission, and the retransmission mode during the remaining time is retransmission by HARQ-ACK, where the transmission resources used by the first terminal device during the consecutive active SL DRX active time of the second terminal device include, but are not limited to, resources selected from an available candidate resource subset in the first candidate resource set.

[0085] In some aspects, resource exclusion may be performed such that the third candidate resource set or the third candidate resource subset does not include the above resources (all candidate resources before the first slot in the selection window of the first terminal device where the selection window of the first terminal device overlaps with the first consecutive SL DRX active time in the selection window of the second terminal device or the next consecutive SL DRX active time after the start of the selection window). That is, it is necessary to exclude all candidate resources before the start time of the first slot in the selection window of the transmitting device where the selection window of the transmitting device overlaps with the first or next consecutive SL DRX active time in this period of the receiving device. Figure 10 shows the location of the excluded resources.

[0086] In the above aspect, the above resource may be excluded when generating the third candidate resource set (step 901), i.e., the third candidate resource set generated by the first terminal device may not include the above candidate resource. Alternatively, the resource may be excluded when determining the third candidate resource subset (step 902), i.e., the first terminal device may exclude all candidate resources before the predetermined time unit from the third candidate resource set or the third candidate resource subset. The present invention is not limited thereto.

[0087] In some aspects, the start time of the selection window of the first terminal device may be delayed so that the above resources (all candidate resources before the first slot in the selection window of the first terminal device where the selection window of the first terminal device overlaps with the first consecutive SL DRX active time in the selection window of the second terminal device or the next consecutive SL DRX active time after the start of the selection window) are not included in the third candidate resource set or the third candidate resource subset. That is, the first terminal device may delay the time domain position of the start time of the selection window until the start time of the above-mentioned predetermined time unit (i.e., the first slot where the selection window of the first terminal device overlaps with the first consecutive SL DRX active time in the selection window of the second terminal device or the next consecutive SL DRX active time after the start of the selection window).

[0088] For example, the physical layer of the first terminal device delays the start time T1 of the selection window of the first terminal device. Specifically, the delayed time domain position is the start time of the first slot where the selection window of the first terminal device overlaps with the first consecutive SL DRX active time or the next consecutive SL DRX active time in the selection window of the second terminal device. Figure 11 shows the case where the start position of the selection window is delayed from T1 to T1'.

[0089] In some aspects, the control of the start time of the selection window may be realized by the MAC layer of the first terminal device. For example, the upper layer of the first terminal device delays the notification of the parameters related to the resource selection of the third candidate resource set to the physical layer of the first terminal device until a predetermined time before the first slot of the next consecutive SL DRX active time of the second terminal device's current time. Preferably, the predetermined time is T1 or T proc,1 SL It is.

[0090] For example, the related procedure of resource selection in TS 38.321 of 3GPP may be modified as follows:

[0091] [Table 2] TIFF0007605323000003.tif61170 In an embodiment of the present invention, if the number of slots overlapped between the selection window of the first terminal device and the first consecutive SL DRX active time in the selection window of the second terminal device or the next consecutive SL DRX active time after the start of the selection window is smaller than a predetermined threshold, the first slot overlapped between the selection window of the first terminal device and the next consecutive SL DRX active time after the start of the selection window of the second terminal device is taken as the predetermined time unit. That is, if the number of the first slots of the first consecutive SL DRX active time overlapping with the selection window is smaller than a predetermined threshold, it is necessary to exclude all candidate resources in the slot overlapping with the selection window of the first terminal device and the first consecutive SL DRX active time, or delay the selection window through the physical layer or MAC layer to the start symbol of the second consecutive SL DRX active time overlapping with the selection window. Similarly, if the number of slots overlapping with the selection window and the second consecutive SL DRX active time is still smaller than the above predetermined threshold, continue to exclude all candidate resources in the overlapping slot, or continue to delay the selection window, until the above condition is met.

[0092] 12 is a schematic diagram of an example in which consecutive SL DRX active times of a receiving device overlap with a selection window of a transmitting device. As shown in FIG. 12, since the number of overlapping slots of a first consecutive SL DRX active time that overlaps with the selection window is smaller than a predetermined threshold, the candidate resource before the first slot of a second consecutive SL DRX active time that overlaps with the selection window is excluded from the third candidate resource set or the third candidate resource subset.

[0093] Fig. 13 is a schematic diagram of another example when the consecutive SL DRX active times of the receiving device overlap with the selection window of the transmitting device. As shown in Fig. 13, the number of overlapping slots of the first consecutive SL DRX active time that overlaps with the selection window is smaller than a predetermined threshold, so the start time of the selection window is delayed to T1', which excludes the candidate resource before the first slot of the second consecutive SL DRX active time that overlaps with the original selection window.

[0094] In an embodiment of the present invention, similarly to the first embodiment, the consecutive SL DRX active time in the selection window of the first terminal device of the second terminal device is at least one consecutive slot. The consecutive at least one slot may be an operation period of the discontinuous reception duration timer (drx-OnDurationTimer) in the side link of the second terminal device, may be an operation period of the discontinuous reception inactivity timer (drx-InactivityTimer) in the side link of the second terminal device, may be an operation period of the discontinuous reception retransmission timer (drx-RetransmissionTimer) in the side link of the second terminal device, or may be a combination of operation periods of one or more of the above three side link timers. In other words, the above active time in the selection window of the first terminal device of the second terminal device may be an operation period of one or more of the above three side link timers.

[0095] It should be noted that in the embodiments of the present invention, the names of the sidelink timers mentioned above are merely exemplary, and the present invention is not limited thereto, and other names may be used for the above three sidelink timers.

[0096] In an embodiment of the present invention, similar to the first embodiment, the timers on the sidelink may be configured for unicast, i.e., may be unicast specific, and may include an operating period, a size and an offset, and / or the timers on the sidelink may be configured as common timers, i.e., the configuration of the timers on the sidelink may be common regardless of whether the unicast transmission method, the groupcast transmission method or the broadcast transmission method is used.

[0097] In the embodiment of the present invention, similar to the first embodiment, in some aspects, when partial sensing is configured in the first terminal device, the overlap means an overlap between the consecutive SL DRX active times and the candidate slot set selected by the physical layer of the first terminal device in the selection window of the first terminal device, because in the first terminal device configured with partial sensing, the selectable candidate resources are limited to the candidate slot set selected by the physical layer in the selection window of the first terminal device.

[0098] The above-mentioned embodiments are merely illustrative of the present invention, and the present invention is not limited thereto, and appropriate modifications may be made based on the above-mentioned embodiments. For example, each of the above-mentioned embodiments may be used alone, or one or more of the above-mentioned embodiments may be used in combination.

[0099] According to this embodiment, the transmitter is restricted not to select resources before the first slot where the transmitter's selection window overlaps with the receiver's next consecutive SL DRX active time.

[0100] <Example 3> An embodiment of the present invention provides a resource selection method, which is described from the first terminal device side. The first terminal device may transmit sidelink data to a second terminal device, and the second terminal device is configured with SL DRX. Here, the SL DRX configuration may be configured for the second terminal device by a network device, may be pre-configured, may be configured for the second terminal device by the first terminal device, or may be configured for itself by the second terminal device according to its own power saving requirement, but the present invention is not limited thereto. Also, from the viewpoint of sidelink data transmission, the first terminal device in the embodiment of the present invention is a transmitting device, and the second terminal device is a receiving device.

[0101] The third embodiment may be combined with the first embodiment or may be implemented independently, and the description of the same contents as those of the first embodiment will be omitted.

[0102] 14 is a schematic diagram of a resource selection method according to an embodiment of the present invention. As shown in FIG. 14, the method includes the following steps:

[0103] Step 1401: The first terminal device selects a transmission resource in a candidate resource subset for transmitting sidelink data.

[0104] Here, the first terminal device first selects one transmission resource in the candidate resource subset, and the one transmission resource is selected in the candidate resources in a period in which a selection window of the first terminal device and consecutive SL DRX active times in the selection window of the second terminal device overlap.

[0105] Then, the first terminal device selects the remaining transmission resources in the candidate resource subset other than the candidate resources preceding the predetermined time unit of the selection window of the first terminal device, the predetermined time unit meaning the first slot where the selection window of the first terminal device overlaps with the consecutive SL DRX active time of the second terminal device in which the initially selected transmission resource is located.

[0106] In an embodiment of the present invention, when the selection window of the transmitting device overlaps with two or more consecutive SL DRX active times of the receiving device, the MAC layer of the transmitting device first selects one candidate resource in the candidate resource subset reported by the physical layer within the period where the selection window of the transmitting device overlaps with the consecutive SL DRX active times of the receiving device in this period. Then, the MAC layer of the transmitting device selects a transmission resource for the remaining number of transmissions, but the selected transmission resource must not be before the first slot where the selection window of the transmitting device overlaps with the consecutive SL DRX active times of the receiving device in this period, in which the first selected transmission resource is located. This restricts the transmitting device not to select a resource before the first slot of the next consecutive SL DRX active time of the receiving device, as in the second embodiment.

[0107] In an embodiment of the present invention, during the time overlapping with the consecutive SL DRX active time of the second terminal device, the retransmission mode of the first terminal device is blind retransmission, and the retransmission mode during the remaining time is retransmission by HARQ-ACK, where the transmission resources used by the first terminal device during the consecutive active SL DRX active time of the second terminal device include, but are not limited to, resources selected from an available candidate resource subset in the first candidate resource set.

[0108] Fig. 15 is a schematic diagram of an example of resource selection performed by a transmitting device according to a method of an embodiment of the present invention. As shown in Fig. 15, after selecting the first transmission resource in the consecutive SL DRX active time overlapping with the selection window of the receiving device, the transmitting device can select a transmission resource for another transmission number from the candidate resources other than the resource before the first slot of the consecutive SL DRX active time, thereby avoiding selecting a transmission resource before the active of the receiving device.

[0109] In some aspects, the candidate resource subset includes a first candidate resource subset and a second candidate resource subset. The first candidate resource subset is a set of available candidate resources for sidelink data transmission in the first candidate resource set, the first candidate resource set being a set of all candidate resources within a period of overlap between a selection window of the first terminal device and at least one consecutive SL DRX active time in the selection window of the second terminal device. The second candidate resource subset is a set of available candidate resources for sidelink data transmission in the second candidate resource set, the second candidate resource set being a set of remaining candidate resources other than the candidate resources preceding a predetermined time unit in the selection window of the first terminal device. The predetermined time unit refers to the first slot of overlap between the selection window of the first terminal device and the first consecutive SL DRX active time in the selection window of the second terminal device or the next consecutive SL DRX active time after the start of the selection window. In this case, the first terminal device selects the one transmission resource in the first candidate resource subset and selects the remaining transmission resource in the second candidate resource subset.

[0110] For example, when the selection window corresponding to the transmitting device overlaps with two or more consecutive SL DRX active times of the receiving device (in this case, the physical layer reports two subsets of candidate resource sets (a first candidate resource subset and a second candidate resource subset), and the first candidate resource subset corresponds to all two or more consecutive SL DRX active times of the receiving UE that overlap with the selection window of the transmitting device), select one of the candidate resources in the first candidate resource subset, and select resources corresponding to the remaining number of transmissions in the second candidate resource subset.

[0111] In some aspects, the first terminal device selects the one transmission resource among the candidate resources in a period where the selection window of the first terminal device overlaps with a first consecutive SL DRX active time in the selection window of the second terminal device. If the candidate resource is not included in the candidate resource set, the first terminal device selects the one transmission resource among the candidate resources in a period where the selection window of the first terminal device overlaps with a next consecutive SL DRX active time in the selection window of the second terminal device until the one transmission resource is selected.

[0112] For example, the MAC layer of the transmitting device may preferentially select candidate resources within a period of overlap between the transmitting device's selection window and the receiving device's first consecutive SL DRX active time within that period, and if such candidate resources are not included in the candidate resource set reported by the physical layer, the transmitting device selects candidate resources within a period of overlap between the second consecutive SL DRX active time, and so on.

[0113] In an embodiment of the present invention, similarly to embodiment 2, if the number of slots overlapping between the selection window of the first terminal device and the first consecutive SL DRX active time in the selection window of the second terminal device or the next consecutive SL DRX active time after the start of the selection window is smaller than a predetermined threshold, the first slot overlapping between the selection window of the first terminal device and the next consecutive SL DRX active time after the start of the selection window of the second terminal device is set as the predetermined time unit. If the number of slots of the next consecutive SL DRX active time overlapping with the selection window is still smaller than the predetermined threshold, the above operation is continued until the number of overlapping slots becomes equal to or greater than the predetermined threshold.

[0114] In an embodiment of the present invention, the one transmission resource may be a resource used for the initial transmission of sidelink data, but the present invention is not limited thereto, and as shown in FIG. 15, the one transmission resource may not be a resource used for the initial transmission of the sidelink data.

[0115] In an embodiment of the present invention, similar to the first embodiment, the consecutive SL DRX active time in the selection window of the first terminal device of the second terminal device is at least one consecutive slot. The consecutive at least one slot may be an operation period of the discontinuous reception duration timer (drx-OnDurationTimer) in the side link of the second terminal device, an operation period of the discontinuous reception inactivity timer (drx-InactivityTimer) in the side link of the second terminal device, an operation period of the discontinuous reception retransmission timer (drx-RetransmissionTimer) in the side link of the second terminal device, or a combination of operation periods of one or more of the above three side link timers. In other words, the above active time in the selection window of the first terminal device of the second terminal device may be an operation period of one or more of the above three side link timers. Note that in the embodiment of the present invention, the names of the above timers are merely exemplary, and the present invention is not limited thereto, and other names may be used for the above three side link timers.

[0116] In an embodiment of the present invention, similar to the first embodiment, the timers on the sidelink may be configured for unicast, i.e., may be unicast specific, and may include an operating period, a size and an offset, and / or the timers on the sidelink may be configured as common timers, i.e., the configuration of the timers on the sidelink may be common regardless of whether the unicast transmission method, the groupcast transmission method or the broadcast transmission method is used.

[0117] In the embodiment of the present invention, similarly to the first embodiment, in some aspects, when partial sensing is configured in the first terminal device, the overlap means an overlap between the consecutive SL DRX active times and a candidate slot set selected by the physical layer of the first terminal device in the selection window of the first terminal device, because in the first terminal device configured with partial sensing, the selectable candidate resources are limited to the candidate resource set in the candidate slot selected by the physical layer in the selection window of the first terminal device.

[0118] The above-mentioned embodiments are merely illustrative of the present invention, and the present invention is not limited thereto, and appropriate modifications may be made based on the above-mentioned embodiments. For example, each of the above-mentioned embodiments may be used alone, or one or more of the above-mentioned embodiments may be used in combination.

[0119] According to this embodiment, the transmitter is restricted not to select resources before the first slot where the transmitter's selection window overlaps with the receiver's next consecutive SL DRX active time.

[0120] <Example 4> An embodiment of the present invention provides a resource selection method, which is described from the side of a second terminal device. A first terminal device may transmit sidelink data to a second terminal device, and the second terminal device is configured with SL DRX. Here, the SL DRX configuration may be configured by a network device for the second terminal device, or may be pre-configured, or the first terminal device may be configured for the second terminal device, or the second terminal device may be configured for itself according to its own power saving requirements, but the present invention is not limited thereto. In addition, from the perspective of sidelink data transmission, the first terminal device in the embodiment of the present invention is a transmitting device, and the second terminal device is a receiving device.

[0121] The fourth embodiment is a process on the side of a second terminal device corresponding to the first to third embodiments, and a description of the same contents as those of the first to third embodiments will be omitted.

[0122] 16 is a schematic diagram of a data transmission method according to an embodiment of the present invention. As shown in FIG. 16, the method includes the following steps:

[0123] Step 1601: The second terminal device receives sidelink data transmitted by the first terminal device during consecutive SL DRX active times.

[0124] Step 1602: The second terminal device is in an active state time in a slot in which the first terminal device performs the next retransmission of the sidelink data.

[0125] In an embodiment of the present invention, the receiving device receives the first PSSCH transmission of the transmitting device during its consecutive SL DRX active time, and due to an indication in the corresponding PSCCH or a timer in the operating sidelink triggered by the PSCCH, the receiving device may ensure that it is in "Active time" in the slot in which the transmitting device makes the next retransmission, and for subsequent retransmissions, the receiving device is in "Active time" due to an indication in the PSCCH corresponding to the next retransmission or a timer in the operating sidelink triggered by the PSCCH.

[0126] An embodiment of the present invention uses an extended resource selection mechanism of a transmitting device to ensure that, when SL DRX is configured in a receiving device, the transmitting device can transmit data packets during the active period of the SL DRX of the receiving device, and can avoid a situation in which data packets cannot be received and decoded because the receiving device is in a "non-active" state, thereby ensuring the reliability of data packet transmission.

[0127] <Example 5> An embodiment of the present invention provides a resource selection device.

[0128] 17 is a schematic diagram of a resource selection device according to an embodiment of the present invention. The device may be, for example, a terminal device (for example, the above-mentioned first terminal device), or may be one or more components configured in the terminal device. The description of the same contents as those in the first embodiment will be omitted.

[0129] As shown in FIG. 17, a resource selection device 1700 includes a generation unit 1701, a determination unit 1702, and a selection unit 1703.

[0130] In some aspects, the generating unit 1701 generates a first candidate resource set and a second candidate resource set. The first candidate resource set is a set of all candidate resources in a period in which a selection window of the first terminal device overlaps with at least one consecutive SL DRX active time in the selection window of the second terminal device. The determining unit 1702 determines candidate resources available for sidelink data transmission in the first candidate resource set and candidate resources available for sidelink data transmission in the second candidate resource set, respectively, to obtain a first candidate resource subset and a second candidate resource subset. The selecting unit 1703 selects resources for transmitting a first predetermined number of transmissions of sidelink data in the first candidate resource subset and selects resources for transmitting a remaining number of transmissions of sidelink data in the second candidate resource subset.

[0131] In some aspects, the consecutive SL DRX active time in the selection window of the second terminal device is at least one consecutive slot, and the consecutive at least one slot is at least one of an operation period of a discontinuous reception duration timer (drx-OnDurationTimer) on the sidelink of the second terminal device, an operation period of a discontinuous reception inactivity timer (drx-InactivityTimer) on the sidelink of the second terminal device, or an operation period of a discontinuous reception retransmission timer (drx-RetransmissionTimer) on the sidelink of the second terminal device.

[0132] In some aspects, the first candidate resource set is one of a set of all candidate resources within a period in which the selection window of the first terminal device overlaps with all consecutive SL DRX active times in the selection window of the second terminal device, or a set of all candidate resources within a period in which the selection window of the first terminal device overlaps with the first consecutive SL DRX active time in the selection window of the second terminal device or the next consecutive SL DRX active time after the start of the selection window of the second terminal device.

[0133] In some aspects, the first candidate resource set is one of a set of all candidate resources in a first sub-selection window in a selection window of the first terminal device, or a set of all candidate resources in all sub-selection windows in a selection window of the first terminal device, where the sub-selection window refers to a period of overlap between a selection window of the first terminal device and consecutive SL DRX active times in the selection window of the second terminal device.

[0134] In some aspects, the second candidate resource set is one of a set of remaining candidate resources other than the first candidate resource set in the selection window of the first terminal device, a set of all candidate resources in the selection window of the first terminal device, a set of remaining candidate resources other than the first candidate resource set in the selection window of the first terminal device and the candidate resources a predetermined time unit before in the selection window of the first terminal device, or a set of remaining candidate resources other than the candidate resources a predetermined time unit before in the selection window of the first terminal device, where the predetermined time unit means the first slot where the selection window of the first terminal device overlaps with the first consecutive SL DRX active time in the selection window of the second terminal device or the next consecutive SL DRX active time after the start of the selection window of the second terminal device.

[0135] In some aspects, an RSRP threshold used to determine the first candidate resource subset is smaller than an RSRP threshold used to determine the second candidate resource subset, and / or a transmission priority value used to determine the first candidate resource subset is smaller than a transmission priority value used to determine the second candidate resource subset, and / or a reporting ratio for a first candidate resource set of the same priority is larger or smaller than a corresponding value for the second candidate resource set.

[0136] In some aspects, as shown in FIG. 17, the resource selection apparatus 1700 further includes the following units:

[0137] The first receiving unit 1704 receives, in the physical layer of the first terminal device, transmission parameters for the first candidate resource set and transmission parameters for the second candidate resource set notified by an upper layer of the first terminal device.

[0138] wherein a transmission priority value in the transmission parameters for the first candidate resource set is smaller than a transmission priority value in the transmission parameters for the second candidate resource set, and / or the number of subchannels for transmission of sidelink data in a slot in the transmission parameters for the first candidate resource set is larger or smaller than the number of subchannels for transmission of sidelink data in a slot in the transmission parameters for the second candidate resource set.

[0139] In some aspects, as shown in FIG. 17, the resource selection apparatus 1700 further includes the following units:

[0140] The second receiving unit 1705 receives, in the physical layer of the first terminal device, parameters indicating the discontinuous reception configuration of the second terminal device notified by the upper layer of the first terminal device. The parameters indicating the discontinuous reception configuration of the second terminal device include at least one of an operation period, an offset, and a size of a discontinuous reception duration timer (drx-OnDurationTimer) on the sidelink, a size of a discontinuous reception inactivity timer (drx-InactivityTimer) on the sidelink, a size of a discontinuous reception hybrid automatic retransmission round trip time timer (drx-HARQ-RTT-Timer) on the sidelink, or a size of a discontinuous reception retransmission timer (drx-RetransmissionTimer) on the sidelink.

[0141] In some aspects, the operation of the timers on the sidelink may be unicast specific or common.

[0142] In some aspects, as shown in FIG. 17, the resource selection apparatus 1700 further includes the following units:

[0143] The third receiving unit 1706 receives, in the physical layer of the first terminal device, indication information indicating the device type of the second terminal device and / or indication information indicating the transmission type (cast type) of the current service transmitted by an upper layer of the first terminal device.

[0144] In some aspects, the number of transmission resources selected by the selector 1703 in the first candidate resource subset is predefined or determined by at least one of the following factors: the total number of transmissions of the sidelink data and / or the length of time the second terminal device is in a discontinuous reception active state in the PDB corresponding to the current transmission block or a ratio of said length to the total length of said time, the priority of the packets of the sidelink data, or the result of a measured channel busy ratio (CBR).

[0145] In some aspects, the first terminal device is configured for partial sensing, where the overlap means an overlap between the consecutive SL DRX active times and a candidate slot set selected by the physical layer of the first terminal device in a selection window of the first terminal device.

[0146] 18 is another schematic diagram of a resource selection device according to an embodiment of the present invention. The device may be, for example, a terminal device (for example, the above-mentioned first terminal device), or may be one or more components configured in the terminal device. The description of the same contents as those in the second embodiment will be omitted.

[0147] As shown in FIG. 18, a resource selection device 1800 includes a generation unit 1801, a determination unit 1802, and a selection unit 1803.

[0148] The generating unit 1801 generates a third candidate resource set. The determining unit 1802 determines available candidate resources for sidelink data transmission in the third candidate resource set. The selecting unit 1803 selects resources for transmitting sidelink data in the available candidate resources for sidelink data transmission in the third candidate resource set to obtain a third candidate resource subset, where the third candidate resource subset includes candidate resources other than all candidate resources prior to a predetermined time unit in a selection window of the first terminal device. The predetermined time unit means a first slot where a selection window of the first terminal device overlaps with a first consecutive SL DRX active time in the selection window of the second terminal device or a next consecutive SL DRX active time after the start of the selection window.

[0149] In some aspects, the third candidate resource set generated by the first terminal device does not include all candidate resources prior to the predetermined time unit, or the first terminal device excludes all candidate resources prior to the predetermined time unit.

[0150] In some aspects, the generator 1801 delays the time domain position of the start time of the selection window by the predetermined time unit.

[0151] In some aspects, as shown in FIG. 18, the resource selection apparatus 1800 further includes the following units:

[0152] The transmitting unit 1804 delays notification of parameters regarding resource selection of the third candidate resource set to the physical layer of the first terminal device in an upper layer of the first terminal device until a predetermined time before the first slot of the next consecutive SL DRX active time following the current time of the second terminal device.

[0153] In some aspects, if the number of slots in which the selection window of the first terminal device overlaps with the first consecutive SL DRX active time in the selection window of the second terminal device or the next consecutive SL DRX active time after the start of the selection window is smaller than a predetermined threshold, the selection unit 1803 determines that the first slot in which the selection window of the first terminal device overlaps with the next consecutive SL DRX active time after the start of the selection window of the second terminal device is the predetermined time unit.

[0154] In some aspects, the consecutive SL DRX active time in the selection window of the second terminal device is at least one consecutive slot, which is at least one of an operating period of a discontinuous reception duration timer (drx-OnDurationTimer) on the sidelink of the second terminal device, an operating period of a discontinuous reception inactivity timer (drx-InactivityTimer) on the sidelink of the second terminal device, or an operating period of a discontinuous reception retransmission timer (drx-RetransmissionTimer) on the sidelink of the second terminal device.

[0155] In some aspects, the operation of timers on the sidelink may be unicast specific or common.

[0156] In some aspects, the first terminal device is configured for partial sensing, where the overlap means an overlap between the consecutive SL DRX active times and a candidate slot set selected by the physical layer of the first terminal device in a selection window of the first terminal device.

[0157] Figure 19 is another schematic diagram of a resource selection device according to an embodiment of the present invention. The device may be, for example, a terminal device (for example, the above-mentioned first terminal device), or may be one or more components or elements configured in the terminal device. The description of the same contents as those in the third embodiment will be omitted.

[0158] As shown in FIG. 19, the resource selection device 1900 includes a selection unit 1901. The selection unit 1901 selects a transmission resource for transmitting sidelink data in a candidate resource subset. Here, the selection unit 1901 first selects one transmission resource in the candidate resource subset, and the one transmission resource is selected in the candidate resources of a period in which the selection window of the first terminal device and the consecutive SL DRX active time in the selection window of the second terminal device overlap. Then, the selection unit 1901 selects the remaining transmission resource in the candidate resources other than the candidate resource in the candidate resource subset that is a predetermined time unit before the selection window of the first terminal device. The predetermined time unit means the first slot in which the selection window of the first terminal device and the consecutive SL DRX active time of the second terminal device in which the initially selected transmission resource is located overlap.

[0159] In some aspects, the candidate resource subsets include a first candidate resource subset and a second candidate resource subset, where the first candidate resource subset is a set of available candidate resources for sidelink data transmission in the first candidate resource set, the first candidate resource set being a set of all candidate resources within a period of overlap between the selection window of the first terminal device and at least one consecutive SL DRX active time in the selection window of the second terminal device, and the second candidate resource subset is a set of remaining candidate resources for sidelink data transmission in the second candidate resource set, the second candidate resource set being a set of remaining candidate resources other than the candidate resources preceding a predetermined time unit in the selection window of the first terminal device, the predetermined time unit being the first slot of overlap between the selection window of the first terminal device and the first consecutive SL DRX active time in the selection window of the second terminal device or the next consecutive SL DRX active time after the start of the selection window. A selection unit 1901 selects the one transmission resource in the first candidate resource subset, and selects the remaining transmission resources in the second candidate resource subset.

[0160] In some aspects, if the number of slots in which the selection window of the first terminal device overlaps with the first consecutive SL DRX active time in the selection window of the second terminal device or the next consecutive SL DRX active time after the start of the selection window is smaller than a predetermined threshold, the selection unit 1901 determines that the first slot in which the selection window of the first terminal device overlaps with the next consecutive SL DRX active time after the start of the selection window of the second terminal device is the predetermined time unit.

[0161] In some aspects, the initially selected one transmission resource may be a resource used for an initial transmission of the sidelink data, or alternatively, the initially selected one transmission resource may not be a resource used for an initial transmission of the sidelink data.

[0162] In some aspects, the selection unit 1901 selects the one transmission resource among candidate resources in a period in which the selection window of the first terminal device overlaps with a first consecutive SL DRX active time in the selection window of the second terminal device. If the candidate resource is not included in the candidate resource set, the selection unit 1901 selects the one transmission resource among candidate resources in a period in which the selection window of the first terminal device overlaps with a next consecutive SL DRX active time in the selection window of the second terminal device until the one transmission resource is selected.

[0163] In some aspects, the consecutive SL DRX active time in the selection window of the second terminal device is at least one consecutive slot, which is at least one of an operating period of a discontinuous reception duration timer (drx-OnDurationTimer) on the sidelink of the second terminal device, an operating period of a discontinuous reception inactivity timer (drx-InactivityTimer) on the sidelink of the second terminal device, or an operating period of a discontinuous reception retransmission timer (drx-RetransmissionTimer) on the sidelink of the second terminal device.

[0164] In some aspects, the operation of timers on the sidelink may be unicast specific or common.

[0165] In some aspects, the first terminal device is configured for partial sensing, where the overlap means an overlap between the consecutive SL DRX active times and a candidate slot set selected by the physical layer in a selection window of the first terminal device.

[0166] An embodiment of the present invention further provides a data transmission device.

[0167] 20 is a schematic diagram of a data transmission device according to an embodiment of the present invention. The device may be, for example, a terminal device (for example, the above-mentioned second terminal device), or one or more components configured in the terminal device. The description of the same contents as those in the fourth embodiment will be omitted.

[0168] As shown in Fig. 20, the data transmission device 2000 includes a receiving unit 2001. The receiving unit 2001 receives sidelink data transmitted by the first terminal device during consecutive SL DRX active times of the second terminal device, where the second terminal device is in an active time in a slot in which the first terminal device performs a next retransmission of the sidelink data.

[0169] The above-mentioned embodiments are merely illustrative of the present invention, and the present invention is not limited thereto, and appropriate modifications may be made based on the above-mentioned embodiments. For example, each of the above-mentioned embodiments may be used alone, or one or more of the above-mentioned embodiments may be used in combination.

[0170] In addition, the above describes only the components or modules related to the present invention, but the present invention is not limited thereto. The resource selection device 1700 / 1800 / 1900 and the data transmission device 2000 may further include other components or modules. For specific contents of these components or modules, reference may be made to the related art.

[0171] 17 to 20 only exemplarily show the connection relationships or signal directions between various components or modules, but it is clear to those skilled in the art that various related technologies such as bus connections can be used. The above-mentioned various components or modules may be implemented by hardware devices such as a processor, a memory, a transmitter, and a receiver, and the present invention is not limited thereto.

[0172] According to this embodiment, the extended resource selection mechanism of the transmitting device ensures that, when SL DRX is configured in the receiving device, the transmitting device can transmit data packets during the active period of the SL DRX of the receiving device, and can avoid a situation in which data packets cannot be received and decoded because the receiving device is in a "non-active" state, thereby ensuring the reliability of data packet transmission.

[0173] <Example 6> The embodiment of the present invention further provides a communication system, and may refer to FIG. 3. The description of the same contents as those in the first to fifth embodiments will be omitted.

[0174] In some embodiments, a communication system may include at least a first terminal device and a second terminal device, the first terminal device transmitting sidelink data to the second terminal device, the second terminal device configured for SL DRX.

[0175] Wherein, the first terminal device generates a first candidate resource set and a second candidate resource set, determines available candidate resources for sidelink data transmission in the first candidate resource set and available candidate resources for sidelink data transmission in the second candidate resource set, respectively, obtains a first candidate resource subset and a second candidate resource subset, selects resources in the first candidate resource subset for transmitting a first predetermined number of transmissions of sidelink data, and selects resources in the second candidate resource subset for transmitting a remaining number of transmissions of sidelink data, where the first candidate resource set is a set of all candidate resources within a period of overlap between a selection window of the first terminal device and at least one consecutive SL DRX active time in the selection window of the second terminal device.

[0176] The second terminal device receives the sidelink data during the configured consecutive SL DRX active times.

[0177] In some aspects, a communication system may include at least a first terminal device and a second terminal device, the first terminal device transmitting sidelink data to the second terminal device, the second terminal device configured for SL DRX.

[0178] Here, the first terminal device generates a third candidate resource set, determines available candidate resources for sidelink data transmission in the third candidate resource set, obtains a third candidate resource subset, and selects resources for transmitting sidelink data in the third candidate resource subset, where the third candidate resource subset includes candidate resources other than all candidate resources prior to a predetermined time unit in a selection window of the first terminal device, where the predetermined time unit means the first slot where the selection window of the first terminal device overlaps with the first consecutive SL DRX active time in the selection window of the second terminal device or the next consecutive SL DRX active time after the start of the selection window.

[0179] The second terminal device receives the sidelink data during the configured consecutive SL DRX active times.

[0180] In some aspects, a communication system may include at least a first terminal device and a second terminal device, the first terminal device transmitting sidelink data to the second terminal device, the second terminal device configured for SL DRX.

[0181] Here, the first terminal device selects transmission resources for transmitting sidelink data in a candidate resource subset, where the first terminal device first selects one transmission resource in the candidate resource subset, where the one transmission resource is selected in the candidate resources in a period where the selection window of the first terminal device overlaps with the consecutive SL DRX active time in the selection window of the second terminal device, and the first terminal device selects the remaining transmission resources in the candidate resources other than the candidate resources in the candidate resource subset a predetermined time unit before the selection window of the first terminal device, where the predetermined time unit means the first slot where the selection window of the first terminal device overlaps with the consecutive SL DRX active time of the second terminal device in which the initially selected transmission resource is located.

[0182] The second terminal device receives the sidelink data during the configured consecutive SL DRX active times.

[0183] In some aspects, the second terminal device is in an active state in a slot in which the first terminal device retransmits the sidelink data.

[0184] The embodiment of the present invention further provides a terminal device, but the present invention is not limited thereto and may be other devices.

[0185] Fig. 21 is a schematic diagram of a terminal device according to an embodiment of the present invention. As shown in Fig. 21, the terminal device 2100 may include a processor 2110 and a memory 2120, where the memory 2120 stores data and programs and is connected to the processor 2110. It should be noted that this diagram is exemplary, and other types of structures may be used to supplement or replace this structure to realize communication functions or other functions.

[0186] For example, the processor 2110 may execute a program to implement the methods described in the first to fourth embodiments.

[0187] 21, the terminal device 2100 may further include a communication module 2130, an input unit 2140, a display 2150, a power supply 2160, and the like. Here, the functions of the above units are similar to those of the conventional technology, and the description thereof will be omitted here. It is not necessary for the terminal device 2100 to include all the units shown in FIG. 21. The terminal device 2100 may further include units not shown in FIG. 21, and may refer to the conventional technology.

[0188] In an embodiment of the present invention, there is further provided a computer readable program that, when executed in a terminal device, causes the terminal device to execute the methods described in the first to fourth embodiments.

[0189] An embodiment of the present invention further provides a storage medium having a computer-readable program stored therein, the program causing a terminal device to execute the methods described in embodiments 1 to 4 when the program is executed.

[0190] The above-mentioned apparatus and method of the present invention may be realized by hardware or by a combination of hardware and software.The present invention relates to a computer readable program which, when executed by a logic unit, causes the logic unit to realize the above-mentioned apparatus or components, or to realize the above-mentioned various methods or steps.The present invention relates to a storage medium for storing the above-mentioned program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, etc.

[0191] Each processing method in each device described with reference to the embodiments of the present invention may be implemented by hardware, a software module executed by a processor, or a combination of both. For example, one or more of the functional block diagrams shown in the drawings, or one or more combinations of the functional block diagrams, may correspond to each software module in a computer program flow, or each hardware module. These software modules may correspond to each step shown in the drawings. These hardware modules may be realized by implementing these software modules in hardware, for example, using a field programmable gate array (FPGA).

[0192] The software module may be located in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a mobile hard disk, a CD-ROM, or any other form of storage medium known to those skilled in the art. The storage medium may be connected to the processor so that the processor reads information from the storage medium and writes information to the storage medium, or the storage medium may be a component of the processor. The processor and the storage medium may be located in an ASIC. The software module may be stored in the memory of the mobile terminal, or in a memory card inserted in the mobile terminal. For example, if the device (e.g., a mobile terminal) uses a MEGA-SIM card or a large capacity flash memory device with a relatively large capacity, the software module may be stored in the MEGA-SIM card or the large capacity flash memory device.

[0193] One or more of the functional blocks and / or one or more combinations of functional blocks in the functional block diagrams illustrated in the drawings may be implemented with a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or any suitable combination thereof to perform the functions described herein. One or more of the functional blocks and / or one or more combinations of functional blocks in the functional block diagrams illustrated in the drawings may be implemented with, for example, a combination of computing devices, such as a combination of a DSP and a microprocessor, a combination of multiple microprocessors, one or more microprocessors in combination with a DSP communication, or any other configuration.

[0194] Although the present invention has been described above with reference to specific embodiments, the above description is merely illustrative and does not limit the scope of protection of the present invention. Various modifications and changes may be made to the present invention without departing from the spirit and principles of the present invention, and these modifications and changes are also within the scope of the present invention.

[0195] Furthermore, the following supplementary notes are disclosed regarding the embodiments including the above examples. (Appendix 1) A resource selection method configured in a first terminal device, the first terminal device transmitting sidelink data to a second terminal device, the second terminal device being configured for sidelink discontinuous reception (SL DRX), the method comprising: A step of the first terminal device generating a first candidate resource set and a second candidate resource set, the first candidate resource set being a set of all candidate resources within a period in which a selection window of the first terminal device overlaps with at least one consecutive SL DRX active time in the selection window of the second terminal device; determining, by the first terminal device, candidate resources available for sidelink data transmission in the first candidate resource set and candidate resources available for sidelink data transmission in the second candidate resource set, respectively, to obtain a first candidate resource subset and a second candidate resource subset; and selecting, by the first terminal device, resources in the first candidate resource subset for transmitting a first predetermined number of transmissions of sidelink data and selecting resources in the second candidate resource subset for transmitting a remaining number of transmissions of sidelink data. (Appendix 2) The first candidate resource set comprises: A set of all candidate resources within a period in which the selection window of the first terminal device overlaps with all consecutive SL DRX active times in the selection window of the second terminal device; or The method described in Supplementary Note 1, wherein the candidate resource is one of a set of all candidate resources within a period of overlap between the selection window of the first terminal device and the first consecutive SL DRX active time in the selection window of the second terminal device or the next consecutive SL DRX active time after the start of the selection window of the second terminal device. (Appendix 3) The consecutive SL DRX active times in the selection window of the second terminal device are at least one consecutive slot; The at least one consecutive slot comprises: An operation period of a discontinuous reception duration timer (drx-OnDurationTimer) in a side link of the second terminal device, The operation period of a discontinuous reception inactivity timer (drx-InactivityTimer) in the side link of the second terminal device, or The method described in Supplementary Note 2, wherein the period is at least one of the operation periods of a discontinuous reception retransmission timer (drx-RetransmissionTimer) on the side link of the second terminal device. (Appendix 4) The first candidate resource set is: A set of all candidate resources in a first sub-selection window in the selection window of the first terminal device, or one of a set of all candidate resources in all sub-selection windows in a selection window of the first terminal device; The method described in Supplementary Note 1, wherein the sub-selection window refers to a period of overlap between the selection window of the first terminal device and consecutive SL DRX active times in the selection window of the second terminal device. (Appendix 5) The second candidate resource set comprises: a set of remaining candidate resources other than the first candidate resource set within a selection window of the first terminal device; a set of all candidate resources within a selection window of the first terminal device; A set of remaining candidate resources other than the first candidate resource set in the selection window of the first terminal device and the candidate resources a predetermined time unit before in the selection window of the first terminal device, or one of a set of remaining candidate resources other than the candidate resource a predetermined time unit before in the selection window of the first terminal device; The method described in Supplementary Note 1, wherein the specified time unit means the first slot in which the selection window of the first terminal device overlaps with the first consecutive SL DRX active time in the selection window of the second terminal device or the next consecutive SL DRX active time after the start of the selection window of the second terminal device. (Appendix 6) 2. The method of claim 1, wherein an RSRP threshold used to determine the first candidate resource subset is lower than an RSRP threshold used to determine the second candidate resource subset, and / or a transmission priority value used to determine the first candidate resource subset is lower than a transmission priority value used to determine the second candidate resource subset, and / or a reporting ratio for a first candidate resource set of the same priority is higher or lower than a corresponding value for a second candidate resource set. (Appendix 7) The physical layer of the first terminal device further includes receiving transmission parameters for the first candidate resource set and transmission parameters for the second candidate resource set notified by an upper layer of the first terminal device; 2. The method of claim 1, wherein a transmission priority value in the transmission parameters for the first candidate resource set is smaller than a transmission priority value in the transmission parameters for the second candidate resource set, and / or a number of subchannels for transmission of sidelink data in a slot in the transmission parameters for the first candidate resource set is larger or smaller than a number of subchannels for transmission of sidelink data in a slot in the transmission parameters for the second candidate resource set. (Appendix 8) The physical layer of the first terminal device further includes a step of receiving a parameter indicating a discontinuous reception configuration of the second terminal device notified by an upper layer of the first terminal device; The parameter indicating the discontinuous reception configuration of the second terminal device is The operation period, offset and size of the discontinuous reception duration timer (drx-OnDurationTimer) on the sidelink; The size of the discontinuous reception inactivity timer on the sidelink (drx-InactivityTimer), The size of the Discontinuous Reception Hybrid Automatic Retransmission Round Trip Timer (drx-HARQ-RTT-Timer) on the sidelink, or The method described in Supplementary Note 1, including at least one of the size of a discontinuous reception retransmission timer (drx-RetransmissionTimer) on the sidelink. (Appendix 9) 9. The method of claim 3 or 8, wherein the timer operation is unicast specific or common. (Appendix 10) The method of claim 1, further comprising a step of the physical layer of the first terminal device receiving indication information indicating the device type of the second terminal device and / or indication information indicating the cast type of the current service, transmitted by an upper layer of the first terminal device. (Appendix 11) The number of transmission resources selected by the selector in the first candidate resource subset is predefined, or the total number of transmissions of the sidelink data and / or the time period during which the second terminal device is in a discontinuous reception active state in the PDB corresponding to the current transmission block or the ratio of this time period to the total length of the time period; the priority of the packets of the sidelink data, or 2. The method of claim 1, wherein the determined factor is at least one of the results of a measured channel busy ratio (CBR). (Appendix 12) A method according to any of Supplementary Notes 1 to 8 and 10 to 11, wherein the first terminal device is configured for partial sensing, and the overlap means an overlap between the consecutive SL DRX active times and a candidate slot set selected by the physical layer of the first terminal device in a selection window of the first terminal device. (Appendix 13) A resource selection method applied to a first terminal device, the first terminal device transmitting sidelink data to a second terminal device, the second terminal device being configured for discontinuous reception, the method comprising: The first terminal device generates a third candidate resource set; determining available candidate resources for sidelink data transmission in the third candidate resource set by the first terminal device to obtain a third candidate resource subset; selecting resources in the third candidate resource subset for transmitting sidelink data; A method, wherein the third candidate resource subset includes candidate resources other than all candidate resources prior to a predetermined time unit within the selection window of the first terminal device, the predetermined time unit meaning the first slot where the selection window of the first terminal device overlaps with the first consecutive SL DRX active time in the selection window of the second terminal device or the next consecutive SL DRX active time after the start of the selection window. (Appendix 13a) The method of claim 13, wherein the third candidate resource set generated by the first terminal device does not include all candidate resources prior to a predetermined time unit within the selection window of the first terminal device, or the first terminal device excludes all candidate resources prior to the predetermined time unit within the selection window of the first terminal device from the generated third candidate resource set. (Appendix 14) 14. The method of claim 13, wherein the first terminal device delays the time domain position of the start time of the selection window to the predetermined time unit. (Appendix 15) The method of claim 13, further comprising a step in which the upper layer of the first terminal device delays notification of parameters regarding resource selection of the third candidate resource set to the physical layer of the first terminal device until a predetermined time before the first slot of the next consecutive SL DRX active time following the current time of the second terminal device. (Appendix 16) The method described in Supplementary Note 13, wherein, when the number of slots in which the selection window of the first terminal device overlaps with the first consecutive SL DRX active time in the selection window of the second terminal device or the next consecutive SL DRX active time after the start of the selection window is smaller than a predetermined threshold, the first slot in which the selection window of the first terminal device overlaps with the next consecutive SL DRX active time after the start of the selection window of the second terminal device is the predetermined time unit. (Appendix 17) The consecutive SL DRX active times in the selection window of the second terminal device are at least one consecutive slot; The at least one consecutive slot comprises: An operation period of a discontinuous reception duration timer (drx-OnDurationTimer) in a side link of the second terminal device, The operation period of a discontinuous reception inactivity timer (drx-InactivityTimer) in the side link of the second terminal device, or A method as described in any of Addendums 14 to 16, wherein the period is at least one of the operation periods of a discontinuous reception retransmission timer (drx-RetransmissionTimer) on the side link of the second terminal device. (Appendix 18) 18. The method of claim 17, wherein the sidelink timer operation is unicast specific or common. (Appendix 19) A method as described in any of Supplementary Notes 14 to 16, wherein the first terminal device is configured for partial sensing, and the overlap means an overlap between the consecutive SL DRX active times and a candidate slot set selected by the physical layer of the first terminal device in a selection window of the first terminal device. (Appendix 20) A resource selection method applied to a first terminal device, the first terminal device transmitting sidelink data to a second terminal device, the second terminal device being configured for discontinuous reception, the method comprising: selecting, by the first terminal device, a transmission resource in the candidate resource subset for transmitting sidelink data; The first terminal device first selects one transmission resource in the candidate resource subset, and the one transmission resource is selected in the candidate resource of a period in which a selection window of the first terminal device and a consecutive SL DRX active time in the selection window of the second terminal device overlap; Then, the first terminal device selects a remaining transmission resource in the candidate resource subset other than the candidate resource a predetermined time unit before the selection window of the first terminal device, the predetermined time unit meaning the first slot where the selection window of the first terminal device overlaps with the consecutive SL DRX active time of the second terminal device in which the initially selected transmission resource is located. (Appendix 21) the candidate resource subsets include a first candidate resource subset and a second candidate resource subset; the first candidate resource subset is a set of candidate resources available for sidelink data transmission in a first candidate resource set, the first candidate resource set being a set of all candidate resources within a period of overlap between a selection window of the first terminal device and at least one consecutive SL DRX active time in the selection window of the second terminal device; the second candidate resource subset is a set of candidate resources available for sidelink data transmission in a second candidate resource set, the second candidate resource set being a set of remaining candidate resources other than the candidate resources preceding a predetermined time unit in a selection window of the first terminal device, the predetermined time unit meaning a first slot in which the selection window of the first terminal device overlaps with a first consecutive SL DRX active time in the selection window of the second terminal device or a next consecutive SL DRX active time after the start of the selection window; 21. The method of claim 20, wherein the first terminal device selects the one transmission resource in the first candidate resource subset and selects the remaining transmission resources in the second candidate resource subset. (Appendix 22) A method as described in Supplementary Note 20, in which, when the number of slots in which the selection window of the first terminal device overlaps with the first consecutive SL DRX active time in the selection window of the second terminal device or the next consecutive SL DRX active time after the start of the selection window is smaller than a predetermined threshold, the first slot in which the selection window of the first terminal device overlaps with the next consecutive SL DRX active time after the start of the selection window of the second terminal device is taken as the predetermined time unit. (Appendix 23) 21. The method of claim 20, wherein the one transmission resource is a resource used for an initial transmission of the sidelink data, or the one transmission resource is not a resource used for an initial transmission of the sidelink data. (Appendix 24) The first terminal device selects the one transmission resource in candidate resources in a period in which a selection window of the first terminal device and a first continuous SL DRX active time in the selection window of the second terminal device overlap; If the candidate resource is not included in the candidate resource set, the first terminal device selects the one transmission resource among candidate resources in a period in which a selection window of the first terminal device overlaps with a next consecutive SL DRX active time in the selection window of the second terminal device until the one transmission resource is selected. (Appendix 25) The consecutive SL DRX active times in the selection window of the second terminal device are at least one consecutive slot; The at least one consecutive slot comprises: An operation period of a discontinuous reception duration timer (drx-OnDurationTimer) in a side link of the second terminal device, The operation period of a discontinuous reception inactivity timer (drx-InactivityTimer) in the side link of the second terminal device, or The method described in Supplementary Note 20 or 21, wherein the operation period of the discontinuous reception retransmission timer (drx-RetransmissionTimer) on the side link of the second terminal device is at least one of the operation periods. (Appendix 26) 26. The method of claim 25, wherein the sidelink timer operation is unicast specific or common. (Appendix 27) The method of claim 20 or 21, wherein the first terminal device is configured for partial sensing, and the overlap means an overlap between the consecutive SL DRX active times and a candidate slot set selected by a physical layer in a selection window of the first terminal device. (Appendix 28) A resource selection method configured in a second terminal device, the first terminal device transmitting sidelink data to the second terminal device, the second terminal device being configured for sidelink discontinuous reception, the method comprising: The second terminal device receives sidelink data transmitted by the first terminal device during consecutive SL DRX active periods; The second terminal device is in active time in a slot in which the first terminal device performs a next retransmission of the sidelink data. (Appendix 29) A terminal device including a memory in which a computer program is stored and a processor, the processor being configured to execute the computer program to implement a method according to any one of claims 1 to 28. (Appendix 30) A communication system including a first terminal device and a second terminal device, the first terminal device transmitting sidelink data to the second terminal device, the second terminal device being configured with SL DRX; the first terminal device generates a first candidate resource set and a second candidate resource set, determines available candidate resources for sidelink data transmission in the first candidate resource set and available candidate resources for sidelink data transmission in the second candidate resource set, respectively, obtains a first candidate resource subset and a second candidate resource subset, selects resources for transmitting a first predetermined number of transmissions of sidelink data in the first candidate resource subset, and selects resources for transmitting a remaining number of transmissions of sidelink data in the second candidate resource subset, the first candidate resource set being a set of all candidate resources within a period in which a selection window of the first terminal device overlaps with at least one consecutive SL DRX active time in the selection window of the second terminal device, A communication system in which the second terminal device receives the sidelink data during configured consecutive SL DRX active times. (Appendix 31) A communication system including a first terminal device and a second terminal device, the first terminal device transmitting sidelink data to the second terminal device, the second terminal device being configured with SL DRX; the first terminal device generates a third candidate resource set, determines available candidate resources for sidelink data transmission in the third candidate resource set, obtains a third candidate resource subset, and selects resources for transmitting sidelink data in the third candidate resource subset, the third candidate resource subset including candidate resources other than all candidate resources prior to a predetermined time unit in a selection window of the first terminal device, the predetermined time unit meaning a first slot in which the selection window of the first terminal device overlaps with a first consecutive SL DRX active time in the selection window of the second terminal device or a next consecutive SL DRX active time after a start of the selection window; A communication system in which the second terminal device receives the sidelink data during configured consecutive SL DRX active times. (Appendix 32) A communication system including a first terminal device and a second terminal device, the first terminal device transmitting sidelink data to the second terminal device, the second terminal device being configured with SL DRX; the first terminal device selects transmission resources for transmitting sidelink data in a candidate resource subset, the first terminal device first selecting one transmission resource in the candidate resource subset, the one transmission resource being selected in the candidate resources for a period in which a selection window of the first terminal device overlaps with a consecutive SL DRX active time in the selection window of the second terminal device, and the first terminal device selects remaining transmission resources in the candidate resources other than the candidate resources preceding a predetermined time unit of the selection window of the first terminal device in the candidate resource subset, the predetermined time unit meaning the first slot in which the selection window of the first terminal device overlaps with a consecutive SL DRX active time of the second terminal device in which the initially selected transmission resource is located; A communication system in which the second terminal device receives the sidelink data during configured consecutive SL DRX active times. (Appendix 33) 33. A communication system as described in any of Supplementary Notes 30 to 32, wherein the second terminal device is in an active state in a slot in which the first terminal device retransmits the sidelink data.

Claims

1. A resource selection device configured in a first terminal device, a transmitter for transmitting sidelink data to a second terminal device, the second terminal device being configured for sidelink discontinuous reception (SL DRX); a processor; The processor, Generate a first candidate resource set and a second candidate resource set, the first candidate resource set being a set of one or more candidate resources within a period of overlap between a selection window of the first terminal device and at least one consecutive SL DRX active time in the selection window of the second terminal device, and the second candidate resource set being a set of all candidate resources within the selection window of the first terminal device; determining available candidate resources for sidelink data transmission in the first candidate resource set to obtain a first candidate resource subset; determining available candidate resources for sidelink data transmission in the second candidate resource set to obtain a second candidate resource subset; The consecutive SL DRX active times in the selection window of the second terminal device are at least one consecutive slot; The at least one consecutive slot comprises: an operation period of a discontinuous reception duration timer (drx-OnDurationTimer) in a side link of the second terminal device; An operation period of a discontinuous reception inactivity timer (drx-InactivityTimer) in the side link of the second terminal device, or A resource selection device, which is at least one of the operation periods of a discontinuous reception retransmission timer (drx-RetransmissionTimer) on the side link of the second terminal device.

2. 2. The apparatus of claim 1, wherein the processor is adapted to select resources in the first candidate resource subset for transmitting a first predetermined number of transmissions of the sidelink data and to select resources in the second candidate resource subset for transmitting a remaining number of transmissions of the sidelink data.

3. The first candidate resource set comprises: A set of one or more candidate resources within a period of overlap between the selection window of the first terminal device and all consecutive SL DRX active times in the selection window of the second terminal device; or one of a set of one or more candidate resources within a period of overlap between a selection window of the first terminal device and a first consecutive SL DRX active time in the selection window of the second terminal device or a next consecutive SL DRX active time after the start of the selection window of the second terminal device; The second candidate resource set comprises: a set of remaining candidate resources other than the first candidate resource set within a selection window of the first terminal device; A set of remaining candidate resources other than the first candidate resource set in the selection window of the first terminal device and the candidate resources a predetermined time unit before in the selection window of the first terminal device, or one of a set of remaining candidate resources other than the candidate resource a predetermined time unit before in the selection window of the first terminal device; 2. The resource selection device according to claim 1, wherein the predetermined time unit means a first slot where the selection window of the first terminal device overlaps with a first consecutive SL DRX active time in the selection window of the second terminal device or a next consecutive SL DRX active time after the start of the selection window of the second terminal device.

4. 2. The resource selection apparatus of claim 1, wherein an RSRP threshold used by the processor to determine the first candidate resource subset is lower than an RSRP threshold used to determine the second candidate resource subset; and / or a transmission priority value used by the processor to determine the first candidate resource subset is lower than a transmission priority value used to determine the second candidate resource subset; and / or a reporting ratio determined by the processor for a first candidate resource set of the same priority is higher or lower than a corresponding value for the second candidate resource set.

5. A receiver that receives, in a physical layer of the first terminal device, transmission parameters for the first candidate resource set and transmission parameters for the second candidate resource set notified by an upper layer of the first terminal device; 2. The resource selection apparatus of claim 1, wherein a value of a transmission priority in the transmission parameters for the first candidate resource set is smaller than a value of a transmission priority in the transmission parameters for the second candidate resource set and / or a number of subchannels for the transmission of sidelink data in a slot in the transmission parameters for the first candidate resource set is larger or smaller than a number of subchannels for the transmission of sidelink data in a slot in the transmission parameters for the second candidate resource set.

6. The resource selection device according to claim 1 , further comprising: a receiver that receives, in a physical layer of the first terminal device, a parameter indicating a discontinuous reception configuration of the second terminal device notified by an upper layer of the first terminal device.

7. The parameter indicating the discontinuous reception configuration of the second terminal device is The operation period, offset and size of the discontinuous reception duration timer (drx-OnDurationTimer) on the sidelink; The size of the discontinuous reception inactivity timer (drx-InactivityTimer) on the sidelink; The size of the discontinuous reception hybrid automatic repeat round trip timer (drx-HARQ-RTT-Timer) on the sidelink, or The resource selection apparatus of claim 6, further comprising at least one of a size of a discontinuous reception retransmission timer (drx-RetransmissionTimer) on the sidelink.

8. The number of transmission resources selected by the processor in the first candidate resource subset is predefined, or the total number of transmissions of the sidelink data and / or the length of time that the second terminal device is in a discontinuous reception active state within the PDB corresponding to the current transmission block or the ratio of such time to the total length of such time, the priority of the packets of the sidelink data, or 3. The resource selection device of claim 2, determined at least in part by a result of a measured channel busy ratio (CBR).

9. 2. The resource selection device of claim 1, wherein the processor controls to perform partial sensing, and the overlap means an overlap between the consecutive SL DRX active times and a candidate slot set selected by a physical layer of the first terminal device in a selection window of the first terminal device.

10. A resource selection device configured in a first terminal device, a transmitter for transmitting sidelink data to a second terminal device, the second terminal device being configured for discontinuous reception; and a processor; The processor, generating a third candidate resource set; determining available candidate resources for sidelink data transmission in the third candidate resource set to obtain a third candidate resource subset; selecting resources in the third candidate resource subset for transmitting sidelink data; The third candidate resource subset includes candidate resources other than all candidate resources prior to a predetermined time unit in the selection window of the first terminal device, the predetermined time unit being the first slot where the selection window of the first terminal device overlaps with the first consecutive SL DRX active time in the selection window of the second terminal device or the next consecutive SL DRX active time after the start of the selection window; The consecutive SL DRX active times in the selection window of the second terminal device are at least one consecutive slot; The at least one consecutive slot comprises: an operation period of a discontinuous reception duration timer (drx-OnDurationTimer) in a side link of the second terminal device; An operation period of a discontinuous reception inactivity timer (drx-InactivityTimer) in the side link of the second terminal device, or A resource selection device, which is at least one of the operation periods of a discontinuous reception retransmission timer (drx-RetransmissionTimer) on the side link of the second terminal device.

11. The resource selection device of claim 10, wherein the third candidate resource set generated by the processor does not include all candidate resources prior to a predetermined unit of time within the selection window of the first terminal device, or the processor excludes all candidate resources prior to the predetermined unit of time within the selection window of the first terminal device from the third candidate resource set generated by the processor.

12. 11. The resource selection device of claim 10, wherein the transmitter delays notification of parameters related to resource selection of the third candidate resource set to a physical layer of the first terminal device in an upper layer of the first terminal device until a predetermined time before a first slot of a consecutive SL DRX active time next to a current time of the second terminal device.

13. The resource selection device of claim 10, wherein the processor controls to perform partial sensing, and the overlap means an overlap between the consecutive SL DRX active times and a candidate slot set selected by a physical layer of the first terminal device in a selection window of the first terminal device.

14. A resource selection device configured in a first terminal device, a transmitter for transmitting sidelink data to a second terminal device, the second terminal device being configured for discontinuous reception; and a processor; and selecting a transmission resource in a candidate resource subset for transmitting the sidelink data. The processor first selects one transmission resource in the candidate resource subset, and the one transmission resource is selected in a candidate resource during a period in which a selection window of the first terminal device and consecutive SL DRX active times in the selection window of the second terminal device overlap; Then, the processor selects remaining transmission resources in the candidate resource subset other than the candidate resources a predetermined time unit before the selection window of the first terminal device, the predetermined time unit meaning the first slot where the selection window of the first terminal device overlaps with a consecutive SL DRX active time of a second terminal device in which the initially selected transmission resource is located.

15. the candidate resource subsets include a first candidate resource subset and a second candidate resource subset; the first candidate resource subset is a set of available candidate resources for sidelink data transmission in a first candidate resource set, the first candidate resource set being a set of one or more candidate resources within a period of overlap between a selection window of the first terminal device and at least one consecutive SL DRX active time in the selection window of the second terminal device; the second candidate resource subset is a set of candidate resources available for sidelink data transmission in a second candidate resource set, the second candidate resource set being a set of remaining candidate resources other than the candidate resources previous to a predefined time unit in a selection window of the first terminal device, the predefined time unit meaning the first slot of overlap between the selection window of the first terminal device and a first consecutive SL DRX active time in the selection window of the second terminal device or a next consecutive SL DRX active time after the start of the selection window; The resource selection apparatus of claim 14 , wherein the processor is configured to select the one transmission resource in the first candidate resource subset and the remaining transmission resource in the second candidate resource subset.

16. 15. The resource selection device of claim 14, wherein when the number of slots overlapping between the selection window of the first terminal device and the first consecutive SL DRX active time in the selection window of the second terminal device or the next consecutive SL DRX active time after the start of the selection window is smaller than a predetermined threshold, the first slot overlapping between the selection window of the first terminal device and the next consecutive SL DRX active time after the start of the selection window of the second terminal device is set as the predetermined time unit.

17. The processor selects the one transmission resource among candidate resources in a period in which a selection window of the first terminal device and a first consecutive SL DRX active time in the selection window of the second terminal device overlap; 15. The resource selection device of claim 14, wherein if the candidate resource is not included in the candidate resource set, the processor selects the one transmission resource among candidate resources in a period in which a selection window of the first terminal device overlaps with a next consecutive SL DRX active time in the selection window of the second terminal device until the one transmission resource is selected.

18. The resource selection device according to claim 14, wherein the processor controls to perform partial sensing, and the overlap means an overlap between the consecutive SL DRX active times and a candidate slot set selected by a physical layer in a selection window of the first terminal device.

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