CN117957903A

CN117957903A - Method for transmitting/receiving information related to cooperation between UEs in wireless communication system and apparatus therefor

Info

Publication number: CN117957903A
Application number: CN202280062747.2A
Authority: CN
Inventors: 黄大成; 李承旻
Original assignee: LG Electronics Inc
Current assignee: LG Electronics Inc
Priority date: 2021-09-17
Filing date: 2022-09-16
Publication date: 2024-04-30

Abstract

A method for transmitting information related to inter-UE cooperation by a first terminal in a wireless communication system according to one embodiment of the present specification includes the steps of: determining information related to inter-UE cooperation based on the configuration information; and transmitting information related to the inter-UE cooperation to the second terminal. The information related to inter-UE cooperation is based on information indicating a preferred resource or information indicating a conflict of reserved resources. The preferred resources are determined among the resources related to the transmission of the second terminal based on the information on the first condition included in the configuration information. An RSRP threshold associated with the RSRP measured by the first terminal is determined based on the information about the second condition included in the configuration information.

Description

Method for transmitting/receiving information related to cooperation between UEs in wireless communication system and apparatus therefor

Technical Field

The present disclosure relates to a method and apparatus for transmitting and receiving information related to inter-UE cooperation in a wireless communication system.

Background

A wireless communication system is a multiple-access system that supports communication for multiple users by sharing available system resources (e.g., bandwidth, transmission power, etc.) among the multiple users. Examples of multiple-access systems include Code Division Multiple Access (CDMA) systems, frequency Division Multiple Access (FDMA) systems, time Division Multiple Access (TDMA) systems, orthogonal Frequency Division Multiple Access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, and multiple carrier frequency division multiple access (MC-FDMA) systems.

Side Link (SL) communication is a communication scheme in which a direct link is established between User Equipments (UEs) and the UEs exchange voice and data directly with each other without intervention of an evolved node B (eNB). SL communication is being considered as a solution for eNB overhead due to the rapid growth of data traffic.

Vehicle-to-all (V2X) refers to a communication technology in which a vehicle is used to exchange information with other vehicles, pedestrians, objects equipped with an infrastructure, and the like. V2X can be classified into four types such as V2V (vehicle-to-vehicle), V2I (vehicle-to-infrastructure), V2N (vehicle-to-network), and V2P (vehicle-to-pedestrian). V2X communication may be provided through a PC5 interface and/or Uu interface.

As a larger range of communication devices requires greater communication capacity, the need for enhanced mobile broadband communications relative to existing Radio Access Technologies (RATs) is rising. Thus, communication system designs for UEs or services that are sensitive to reliability and latency have also been discussed. Also, next generation radio access technologies based on enhanced mobile broadband communications, large-scale Machine Type Communications (MTC), ultra-reliable low latency communications (URLLC), etc. may be referred to as new RATs (radio access technologies) or NR (new radios). Herein, NR may also support vehicle-to-everything (V2X) communication.

Regarding the inter-UE cooperation mechanism, two schemes may be considered. In scheme 1, UE-A may provide UE-B with a set of resources that may be used for the UE-B's resource selection (reselection) procedure. In scheme 2, UE-A may provide UE-B with resource conflict related information for resources indicated by side chain control information (SCI) of UE-B. The UE-B may avoid resource collision by reselecting some of the resources indicated by the SCI of the UE-B.

The set of resources that may be used for the UE-B in relation to the resource selection (reselection) procedure of scheme 1 may comprise preferred resources and/or non-preferred resources. The UE-a may determine a preferred resource or a non-preferred resource by using its sensing result. In this case, certain resources may be excluded from the preferred resources based on UE capabilities (e.g., half duplex).

With respect to scheme 2, information may be sent to the UE-B indicating a collision of resources reserved by the UE-B. In this case, the reserved resource conflict may be determined based on a comparison of the RSRP measured by the UE-a with an RSRP threshold.

Disclosure of Invention

Technical problem

Regarding schemes (scheme 1 and scheme 2) of inter-UE cooperation information, the following technical matters can be considered. In terms of accuracy of inter-UE cooperation information, each UE may require a specific configuration/condition regarding a generation operation of the inter-UE cooperation information.

As an example, as described above, certain resources may be excluded from the preferred resources based on UE capabilities (e.g., half duplex). However, when the relevant exclusion operation is applied at one time when the preferred resource is determined, the available resource may be shorter. Therefore, accuracy of inter-UE cooperation information may be reduced.

As an example, when a unified value is used as an RSRP threshold for determining a conflict of reserved resources without detailed configuration for each UE at a time, RSRP measurement capability of the UE generating inter-UE cooperation information may not be sufficiently considered. Therefore, even in this case, the accuracy of the inter-UE cooperation information may be reduced.

The present disclosure proposes a method of solving the above-mentioned problems.

The objects of the present disclosure are not limited to the foregoing, and other non-mentioned objects will be apparent to those of ordinary skill in the art from the following description.

Technical proposal

In one aspect, a method for a first User Equipment (UE) to transmit information related to inter-UE cooperation in a wireless communication system includes the steps of: and determining information related to inter-UE cooperation based on the configuration information, and transmitting the information related to inter-UE cooperation to the second UE.

The information related to inter-UE cooperation is based on information representing preferred resources related to scheme 1 or information representing a collision of reserved resources related to scheme 2.

The preferred resources are determined among the resources related to the transmission of the second UE and the collision of reserved resources is determined based on the RSRP measured by the first UE.

The configuration information includes information for i) a first condition related to the determination of the preferred resource and ii) a second condition related to the determination of the conflict of reserved resources.

Based on the information about the first condition, preferred resources are determined among the resources related to the transmission of the second UE. An RSRP threshold associated with the RSRP measured by the first UE is determined based on the information for the second condition.

Based on the information for the first condition, resources excluded from the preferred resources may be determined among resources related to transmission of the second UE.

The resources excluded from the preferred resources may be resources belonging to a predefined time slot, and the predefined time slot may include a time slot in which SL reception of the first UE is not performed.

Based on the information for the first condition, resources included in the preferred resources may be determined among resources related to transmission of the second UE.

The RSRP threshold determined based on the information about the second condition may be related to one or more RSRP among RSRP measured by the first UE.

The one or more RSRP may include an RSRP measured based on a side link demodulation reference signal (SL DMRS) of a predefined UE among UEs related to the reserved resources.

The UE associated with the reserved resources may be based on the UE transmitting first side link control information (SCI) indicating the reserved resources to the first UE.

Based on the information related to inter-UE cooperation related to the request of the second UE, information indicating preferred resources related to scheme 1 may be transmitted.

The configuration information may be based on pre-configuration information or information received from the base station based on RRC signaling.

In another aspect, a first UE transmitting information related to inter-UE cooperation in a wireless communication system includes: one or more transceivers; one or more processors that control the one or more transceivers; and one or more memories operatively connected to the one or more processors.

The one or more memories store instructions that perform operations based on execution by the one or more processors.

The operation includes: and determining information related to inter-UE cooperation based on the configuration information, and transmitting the information related to inter-UE cooperation to the second UE.

In yet another aspect, an apparatus for controlling a first UE to transmit information related to inter-UE cooperation in a wireless communication system includes: one or more processors; and one or more memories operatively connected to the one or more processors.

In yet another aspect, one or more non-transitory computer-readable media storing one or more instructions are provided.

The one or more instructions perform operations based on execution by the one or more processors.

In a further aspect, a method of receiving information related to inter-UE cooperation by a second User Equipment (UE) in a wireless communication system includes the steps of: information related to inter-UE cooperation is received from a first UE.

Information related to inter-UE cooperation is determined based on the configuration information.

The method may further comprise the steps of: based on the information indicating the preferred resources related to scheme 1, resources for transmission of a physical side link shared channel (PSSCH) are selected.

The method may further comprise the steps of: first side link control information (SCI) is transmitted. The first SCI may be associated with reserved resources for transmission of a physical side link shared channel (PSSCH).

The method may further comprise the steps of: the resources used for transmission of the PSSCH are reselected based on information indicating a collision of reserved resources related to scheme 2.

In yet another aspect, a second UE that receives information related to inter-UE cooperation in a wireless communication system includes: one or more transceivers; one or more processors that control the one or more transceivers; and one or more memories operatively connected to the one or more processors.

The operation includes: information related to inter-UE cooperation is received from a first UE.

Advantageous effects

According to the embodiments of the present disclosure, the condition for generating the inter-UE cooperation information is configured for each scheme of the inter-UE cooperation. Therefore, the accuracy of information (preferred resource or resource conflict information) transmitted and received for inter-UE cooperation can be improved.

More specifically, in the case of scheme 1, it is possible to prevent the problem that many resources are not significantly excluded when determining a preferred resource and thus the available resources become short. In case of scheme 2, the resource conflict may be determined based on an RSRP threshold more suitable for the UE capability.

The effects of the present disclosure are not limited to the foregoing, and other effects not mentioned will be apparent to those of ordinary skill in the art from the following description.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this detailed description, illustrate embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.

Fig. 1 shows a structure of an NR system according to an embodiment of the present disclosure.

Fig. 2 shows a structure of a radio frame of NR based on one embodiment of the present disclosure.

Fig. 3 illustrates a structure of a slot of an NR frame according to one embodiment of the present disclosure.

Fig. 4 illustrates a UE performing V2X or SL communication according to one embodiment of the present disclosure.

Fig. 5 illustrates a resource unit for V2X or SL communication, according to one embodiment of the present disclosure.

Fig. 6 illustrates a process of performing V2X or SL communication by a UE based on a transmission mode, according to one embodiment of the present disclosure.

Fig. 7 illustrates three broadcast types according to one embodiment of the present disclosure.

Fig. 8 illustrates a plurality of BWP according to one embodiment of the present disclosure.

Fig. 9 illustrates BWP according to one embodiment of the present disclosure.

Fig. 10 illustrates a resource unit for CBR measurement in accordance with one embodiment of the present disclosure.

Fig. 11 illustrates a resource pool associated with CBR measurements.

Fig. 12 illustrates a process by which UE-a transmits assistance information to UE-B in accordance with one embodiment of the present disclosure.

Fig. 13 is a flowchart for describing a method of transmitting information related to inter-UE cooperation by a first UE in a wireless communication system according to one embodiment of the present disclosure.

Fig. 14 is a flowchart for describing a method of receiving information related to inter-UE cooperation by a second UE in a wireless communication system according to another embodiment of the present disclosure.

Fig. 15 shows a communication system 1 according to one embodiment of the present disclosure.

Fig. 16 illustrates a wireless device according to one embodiment of the present disclosure.

Fig. 17 illustrates a signal processing circuit for transmitting a signal in accordance with one embodiment of the present disclosure.

Fig. 18 illustrates another example of a wireless device according to one embodiment of the present disclosure.

Fig. 19 illustrates a handheld device according to one embodiment of the present disclosure.

Fig. 20 illustrates a vehicle or autonomous vehicle in accordance with one embodiment of the present disclosure.

Detailed Description

In this disclosure, "a or B" may mean "a only", "B only" or "both a and B". In other words, in the present disclosure, "a or B" may be interpreted as "a and/or B". For example, in this disclosure, "A, B or C" may mean "a only", "B only", "C only" or "A, B, C in any combination.

A slash (/) or comma as used in this disclosure may mean "and/or". For example, "A/B" may mean "A and/or B". Thus, "a/B" may mean "a only", "B only" or "both a and B". For example, "A, B, C" may mean "A, B or C".

In the present disclosure, "at least one of a and B" may mean "a only", "B only", or "both a and B". In addition, in the present disclosure, the expression "at least one of a or B" or "at least one of a and/or B" may be interpreted as "at least one of a and B".

In addition, in this disclosure, "at least one of A, B and C" may mean "a only", "B only", "C only", or "any combination of A, B and C". In addition, "at least one of A, B or C" or "at least one of A, B and/or C" may mean "at least one of A, B and C".

In addition, brackets used in this disclosure may mean "for example". Specifically, when indicated as "control information (PDCCH)", this may mean that "PDCCH" is proposed as an example of "control information". In other words, the "control information" of the present disclosure is not limited to "PDCCH", and "PDDCH" may be proposed as an example of the "control information". In addition, when indicated as "control information (i.e., PDCCH)", this may also mean that "PDCCH" is proposed as an example of "control information".

In the following description, "when, if, or in the case of.

The technical features separately described in a drawing in the present disclosure may be implemented separately or may be implemented simultaneously.

The techniques described below may be used in various wireless communication systems such as Code Division Multiple Access (CDMA), frequency Division Multiple Access (FDMA), time Division Multiple Access (TDMA), orthogonal Frequency Division Multiple Access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. CDMA may be implemented using a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA-2000. TDMA may be implemented using radio technologies such as global system for mobile communications (GSM)/General Packet Radio Service (GPRS)/enhanced data rates for GSM evolution (EDGE). OFDMA may be implemented using radio technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, evolved UTRA (E-UTRA), and so on. IEEE 802.16m is an evolving version of IEEE 802.16e and provides backward compatibility for IEEE 802.16 e-based systems. UTRA is part of Universal Mobile Telecommunications System (UMTS). The third generation partnership project (3 GPP) Long Term Evolution (LTE) is part of evolved UMTS (E-UMTS) that uses E-UTRA. 3GPP LTE uses OFDMA in the downlink and SC-FDMA in the uplink. LTE-advanced (LTE-a) is an evolution of LTE.

The 5G NR is an LTE-a successor technology corresponding to a novel completely new mobile communication system having characteristics of high performance, low latency, high availability, and the like. The 5G NR may use resources including all available frequency spectrums of a low frequency band less than 1GHz, an intermediate frequency band from 1GHz to 10GHz, and a high frequency (millimeter wave) of 24GHz or more, and the like.

For clarity of description, the following description will focus mainly on LTE-a or 5G NR. However, the technical features according to one embodiment of the present disclosure will not be limited thereto.

For terms and techniques not specifically described among terms and techniques used in the present disclosure, reference may be made to a wireless communication standard document published before the present disclosure is submitted. For example, the following documents may be referred to.

Referring to fig. 1, a next generation radio access network (NG-RAN) may include a next generation node B (gNB) and/or eNB providing user plane and control plane protocol terminals to users. Fig. 1 shows a case where the NG-RAN includes only the gNB. The gNB and the eNB are connected to each other via an Xn interface. The gNB and eNB are connected to each other via a fifth generation (5G) core network (5 GC) and NG interface. More specifically, the gNB and eNB are connected to an access and mobility management function (AMF) via an NG-C interface, and the gNB and eNB are connected to a User Plane Function (UPF) via an NG-U interface.

Referring to fig. 2, in NR, a radio frame may be used to perform uplink and downlink transmission. The radio frame is 10ms in length and may be defined as being made up of two fields (HF). A field may include five 1ms Subframes (SFs). A Subframe (SF) may be divided into one or more slots, and the number of slots within the subframe may be determined based on a subcarrier spacing (SCS). Each slot may include 12 or 14 OFDM (a) symbols based on a Cyclic Prefix (CP).

In case of using the normal CP, each slot may include 14 symbols. In case of using the extended CP, each slot may include 12 symbols. Herein, the symbols may include OFDM symbols (or CP-OFDM symbols) and single carrier-FDMA (SC-FDMA) symbols (or discrete fourier transform spread OFDM (DFT-s-OFDM) symbols).

Table 1 below shows the number of slots per symbol (N ^slot _symb), the number of slots per frame (N ^frame,μ _slot), and the number of slots per subframe (N ^subframe,μ _slot) based on SCS set (μ) in case of employing normal CP.

TABLE 1

SCS(15*2^μ)	N^slot _symb	N^frame,μ _slot	N^subframe,μ _slot
				15KHz(μ＝0)	14	10	1
30KHz(μ＝1)	14	20	2
				60KHz(μ＝2)	14	40	4
120KHz(μ＝3)	14	80	8
				240KHz(μ＝4)	14	160	16

Table 2 shows an example of the number of symbols per slot, the number of slots per frame, and the number of slots per subframe based on SCS in case of using the extended CP.

TABLE 2

SCS(15*2^μ)	N^slot _symb	N^frame,μ _slot	N^subframe,μ _slot
				60KHz(μ＝2)	12	40	4

In an NR system, OFDM (a) parameter sets (e.g., SCS, CP length, etc.) between a plurality of cells integrated into one UE may be configured differently. Thus, the (absolute time) duration (or interval) of a time resource (e.g., a subframe, a slot, or a TTI) consisting of the same number of symbols, collectively referred to as a Time Unit (TU) for simplicity, may be configured differently in the integrated cell.

In the NR, a plurality of parameter sets or SCSs for supporting various 5G services may be supported. For example, in the case of an SCS of 15kHz, a wide range of conventional cellular bands can be supported, and in the case of an SCS of 30kHz/60kHz, dense cities, lower latency, wider carrier bandwidths can be supported. In the case where the SCS is 60kHz or more, in order to overcome the phase noise, a bandwidth of more than 24.25GHz can be used.

The NR frequency bands can be defined as two different types of frequency ranges. Two different types of frequency ranges may be FR1 and FR2. The values of the frequency ranges may be changed (or varied), for example, two different types of frequency ranges may be as shown in table 3 below. Among frequency ranges used in NR systems, FR1 may mean "a range below 6 GHz", and FR2 may mean "a range above 6 GHz", and may also be referred to as millimeter wave (mmW).

TABLE 3

Frequency range assignment	Corresponding frequency range	Subcarrier spacing (SCS)
			FR1	450MHz–6000MHz	15、30、60kHz
FR2	24250MHz–52600MHz	60、120、240kHz

As described above, the value of the frequency range in the NR system may be changed (or varied). For example, as shown in table 4 below, FR1 may include a bandwidth in the range of 410MHz to 7125 MHz. More specifically, FR1 may include frequency bands of 6GHz (or 5850, 5900, 5925MHz, etc.) and higher. For example, the frequency bands of 6GHz (or 5850, 5900, 5925MHz, etc.) and higher included in FR1 may include unlicensed frequency bands. The unlicensed band may be used for various purposes, for example, for vehicle-specific communications (e.g., autopilot).

TABLE 4

Frequency range assignment	Corresponding frequency range	Subcarrier spacing (SCS)
			FR1	410MHz–7125MHz	15、30、60kHz
FR2	24250MHz–52600MHz	60、120、240kHz

Referring to fig. 3, a slot includes a plurality of symbols in a time domain. For example, in the case of a normal CP, one slot may include 14 symbols. For example, in the case of the extended CP, one slot may include 12 symbols. Alternatively, in case of the normal CP, one slot may include 7 symbols. However, in the case of the extended CP, one slot may include 6 symbols.

The carrier comprises a plurality of subcarriers in the frequency domain. A Resource Block (RB) may be defined as a plurality of consecutive subcarriers (e.g., 12 subcarriers) in the frequency domain. A bandwidth part (BWP) may be defined as a plurality of consecutive (physical) resource blocks ((P) RBs) in the frequency domain, and the BWP may correspond to one parameter set (e.g., SCS, CP length, etc.). The carrier may include up to N BWP (e.g., 5 BWP). The data communication may be performed via an activated BWP. Each element may be referred to as a Resource Element (RE) in the resource grid, and one complex symbol may be mapped to each element.

The radio interface between the UE and another UE or the radio interface between the UE and the network may consist of L1 layer, L2 layer and L3 layer. In various embodiments of the present disclosure, the L1 layer may imply a physical layer. In addition, for example, the L2 layer may imply at least one of the MAC layer, RLC layer, PDCP layer, and SDAP layer. In addition, for example, the L3 layer may imply an RRC layer.

Side Link Synchronization Signal (SLSS) and synchronization information

SLSS may be a SL specific sequence and include a primary side link synchronization signal (PSSS) and a secondary side link synchronization signal (SSSS). The PSSS may be referred to as a side link primary synchronization signal (S-PSS), and the SSSS may be referred to as a side link secondary synchronization signal (S-SSS). For example, an M sequence of length 127 may be used for S-PSS, and a Golde (Gold) sequence of length 127 may be used for S-SSS. For example, the UE may use the S-PSS for initial signal detection and/or synchronization acquisition. For example, the UE may use the S-PSS and S-SSS for acquisition of fine synchronization and/or for detection of synchronization signal IDs.

The physical side link broadcast channel (PSBCH) may be a (broadcast) channel for transmitting default (system) information that the UE must first know before SL signal transmission/reception. For example, the default information may be information related to SLSS, duplex Mode (DM), time Division Duplex (TDD) uplink/downlink (UL/DL) configuration, information related to resource pool, type of application related to SLSS, subframe offset, broadcast information, etc. For example, to evaluate PSBCH performance, in NR V2X, the payload size of PSBCH may be 56 bits including 24-bit CRC.

The S-PSS, S-SSS, and PSBCH may be included in a block format supporting periodic transmission, e.g., a SL Synchronization Signal (SS)/PSBCH block, hereinafter, a side link synchronization signal block (S-SSB). The S-SSB may have the same parameter set (i.e., SCS and CP length) as the physical side link control channel (PSCCH)/physical side link shared channel (PSSCH) in the carrier, and the transmission bandwidth may exist within a (pre) configured Side Link (SL) BWP. For example, the S-SSB may have a bandwidth of 11 Resource Blocks (RBs). For example, the PSBCH may exist across 11 RBs. In addition, the frequency location of the S-SSB may be (pre) configured. Thus, the UE does not have to perform hypothesis detection at the frequency to find the S-SSB in the carrier.

Multiple parameter sets with different SCS and/or CP lengths may be supported in an NR SL system. In this case, the length of the time resource for transmitting the S-SSB by the transmitting UE may decrease as the SCS increases. Thus, the coverage of the S-SSB can be reduced. Thus, to ensure coverage of the S-SSBs, the transmitting UE may transmit one or more S-SSBs to the receiving UE within one S-SSB transmission period based on the SCS. For example, the number of S-SSBs transmitted by a transmitting UE to a receiving UE within one S-SSB transmission period may be preconfigured or configured to the transmitting UE. For example, the S-SSB transmission period may be 160ms. For example, a 160ms S-SSB transmission period may be supported for all SCS.

Referring to fig. 4, in V2X or SL communication, the term 'UE' may generally imply the UE of the user. However, if a network device such as a BS transmits/receives signals based on a communication scheme between UEs, the BS may also be regarded as a kind of the UEs. For example, UE 1 may be the first apparatus 100 and UE 2 may be the second apparatus 200.

For example, UE 1 may select a resource unit corresponding to a particular resource in a resource pool (which implies a set of resources). In addition, UE 1 may transmit the SL signal by using the resource unit. For example, UE 2 as a receiving UE may be allocated a resource pool in which UE 1 can transmit a signal, and the signal of UE 1 may be detected in the resource pool.

Herein, if UE 1 is within the coverage of the BS, the BS may inform UE 1 of the resource pool. Otherwise, if UE 1 is out of coverage of the BS, another UE may inform UE 1 of the resource pool, or UE 1 may use the preconfigured resource pool.

In general, a resource pool may be configured based on a plurality of resource units, and each UE may select at least one resource unit for SL signal transmission.

Referring to fig. 5, all frequency resources of a resource pool may be divided into NF resources, and all time resources of the resource pool may be divided into NT resources. Thus, NF NT resource units may be defined in the resource pool. Fig. 5 may show an example of a case where the corresponding resource pool is repeated at a period of NT subframes.

As shown in fig. 5, one resource unit (e.g., unit # 0) may be periodically repeated. Alternatively, in order to obtain a diversity effect in the time domain or the frequency domain, the index of the physical resource unit to which one logical resource unit is mapped may be changed to a predetermined pattern over time. In such a structure of resource units, the resource pool may imply a set of resource units that can be used for transmission by the UE intended to send the SL signal.

The resource pool may be subdivided into a plurality of types. For example, based on the content of the SL signals transmitted in each resource pool, the resource pools may be classified as follows:

(1) The Scheduling Assignment (SA) may be a signal comprising information related to: the location of resources used for transmitting the SL data channel by the transmitting UE, a Modulation Coding Scheme (MCS) or Multiple Input Multiple Output (MIMO) transmission scheme required for demodulating other data channels, timing Advance (TA), etc. The SA may be transmitted by multiplexing with SL data on the same resource unit. In this case, the SA resource pool may implicitly transmit the resource pool of the SA by multiplexing with the SL data. The SA may also be referred to as a SL control channel.

(2) The SL data channel (physical side link shared channel (PSSCH)) may be a pool of resources used by the transmitting UE to transmit user data. If the SA is transmitted by multiplexing with the SL data on the same resource unit, only the type of SL data channel other than the SA information may be transmitted in the resource pool of the SL data channel. In other words, the Resource Elements (REs) used to transmit SA information on a single resource element in the SA resource pool may be used to transmit SL data still in the resource pool of the SL data channel. For example, the transmitting UE may transmit the PSSCH by mapping the PSSCH to consecutive PRBs.

(3) The discovery channel may be a resource pool for the transmitting UE to transmit information related to its ID, etc. Thus, the transmitting UE may allow neighboring UEs to discover the transmitting UE itself.

Even if the SL signals described above have the same content, different resource pools may be used based on transmission/reception properties of the SL signals. For example, even the same SL data channel or discovery message may be classified into different resource pools again based on a scheme of determining the SL signal transmission timing (e.g., whether to transmit at the reception time of the synchronization reference signal or by applying a specific timing advance at the reception time), a resource allocation scheme (e.g., whether the BS designates transmission resources of a single signal to a single transmitting UE or whether a single transmitting UE autonomously selects single signal transmission resources in a resource pool), a signal format (e.g., the number of symbols occupied by each SL signal or the number of subframes used in transmission of one SL signal), a signal strength from the BS, a transmission power strength of the SL UE, etc.

Resource allocation in SL

The embodiment of fig. 6 may be combined with various embodiments of the present disclosure. In various embodiments of the present disclosure, the transmission mode may be referred to as a mode or a resource allocation mode. Hereinafter, for convenience of explanation, the transmission mode may be referred to as an LTE transmission mode in LTE. In NR, the transmission mode may be referred to as an NR resource allocation mode.

For example, (a) in fig. 6 shows UE operation related to LTE transmission mode 1 or LTE transmission mode 3. Alternatively, for example, (a) in fig. 6 shows UE operation related to NR resource allocation pattern 1. For example, LTE transmission mode 1 may be applied to conventional SL communication, and LTE transmission mode 3 may be applied to V2X communication.

For example, (b) in fig. 6 shows UE operation in relation to LTE transmission mode 2 or LTE transmission mode 4. Alternatively, for example, (b) in fig. 6 shows UE operation in relation to NR resource allocation pattern 2.

Referring to fig. 6 (a), in LTE transmission mode 1, LTE transmission mode 3, or NR resource allocation mode 1, the base station may schedule SL resources to be used by the UE for SL transmission. For example, in step S600, the base station may transmit information related to SL resources and/or information related to UL resources to the first UE. For example, UL resources may include PUCCH resources and/or PUSCH resources. For example, the UL resource may be a resource for reporting SL HARQ feedback to the base station.

For example, the first UE may receive information related to Dynamic Grant (DG) resources and/or information related to Configuration Grant (CG) resources from the base station. For example, CG resources may include CG type 1 resources or CG type 2 resources. In the present disclosure, DG resources may be resources configured/allocated by a base station to a first UE through Downlink Control Information (DCI). In the present disclosure, CG resources may be (periodic) resources configured/allocated by the base station to the first UE through DCI and/or RRC messages. For example, in case of CG type 1 resources, the base station may transmit an RRC message including information related to the CG resources to the first UE. For example, in case of CG type 2 resources, the base station may transmit an RRC message including information related to CG resources to the first UE, and the base station may transmit DCI related to activation or release of CG resources to the first UE.

In step S610, the first UE may transmit a PSCCH (e.g., side chain control information (SCI) or first level SCI) to the second UE based on the resource scheduling. In step S620, the first UE may transmit a PSCCH (e.g., second-level SCI, MAC PDU, data, etc.) associated with the PSCCH to the second UE. In step S630, the first UE may receive PSFCH related to PSCCH/PSSCH from the second UE. For example, HARQ feedback information (e.g., NACK information or ACK information) may be received from the second UE through PSFCH. In step S640, the first UE may transmit/report HARQ feedback information to the base station through the PUCCH or PUSCH. For example, the HARQ feedback information reported to the base station may be information generated by the first UE based on HARQ feedback information received from the second UE. For example, the HARQ feedback information reported to the base station may be information generated by the first UE based on a preconfigured rule. For example, the DCI may be DCI for SL scheduling. For example, the format of DCI may be DCI format 3_0 or DCI format 3_1. Table 5 shows an example of DCI for SL scheduling.

TABLE 5

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Referring to (b) of fig. 6, in LTE transmission mode 2, LTE transmission mode 4, or NR resource allocation mode 2, the UE may determine SL transmission resources within SL resources configured by the base station/network or pre-configured SL resources. For example, the configured SL resources or pre-configured SL resources may be a pool of resources. For example, the UE may autonomously select or schedule resources for SL transmission. For example, the UE may perform SL communication by autonomously selecting resources within the configured resource pool. For example, the UE may autonomously select resources within the selection window by performing a sensing procedure and a resource (re) selection procedure. For example, sensing may be performed in units of subchannels. For example, in step S610, the first UE, which has itself selected resources from the resource pool, may transmit PSCCH (e.g., side chain control information (SCI) or first stage SCI) to the second UE by using the resources. In step S620, the first UE may transmit a PSCCH (e.g., second level SCI, MAC PDU, data, etc.) associated with the PSCCH to the second UE. In step S630, the first UE may receive PSFCH related to PSCCH/PSSCH from the second UE.

Referring to fig. 6 (a) or (b), for example, the first UE may transmit the SCI to the second UE through the PSCCH. Alternatively, for example, the first UE may send two consecutive SCIs (e.g., level 2 SCIs) to the second UE over the PSCCH and/or PSSCH. In this case, the second UE may decode two consecutive SCIs (e.g., level 2 SCIs) to receive the PSSCH from the first UE. In the present disclosure, an SCI transmitted through a PSCCH may be referred to as a first SCI, a first level SCI, or a first level SCI format, and an SCI transmitted through a PSSCH may be referred to as a second SCI, a second level SCI, or a second level SCI format. For example, the first level SCI format may include SCI format 1-A, and the second level SCI format may include SCI format 2-A and/or SCI format 2-B. Table 6 shows an example of the first stage SCI format.

TABLE 6

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Table 7 shows an example of the second level SCI format.

TABLE 7

Referring to (a) or (b) of fig. 6, the first UE may receive PSFCH based on table 8 in step S630. For example, the first UE and the second UE may determine PSFCH resources based on table 8, and the second UE may send HARQ feedback to the first UE using PSFCH resources.

TABLE 8

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Referring to fig. 6 (a), the first UE may transmit SL HARQ feedback to the base station through PUCCH and/or PUSCH based on table 9 at step S640.

TABLE 9

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Side link control information (SCI)

The control information transmitted by the BS to the UE through the PDCCH may be referred to as Downlink Control Information (DCI), and the control information transmitted by the UE to another UE through the PSCCH may be referred to as SCI. For example, the UE may know the start symbol of the PSCCH and/or the number of symbols of the PSCCH in advance before decoding the PSCCH. For example, the SCI may include SL scheduling information. For example, the UE may send at least one SCI to another UE to schedule the PSSCH. For example, one or more SCI formats may be defined.

For example, the transmitting UE may transmit the SCI to the receiving UE on the PSCCH. The receiving UE may decode one SCI to receive the PSSCH from the transmitting UE.

For example, the transmitting UE may transmit two consecutive SCIs (e.g., level 2 SCIs) to the receiving UE on the PSCCH and/or PSSCH. The receiving UE may decode two consecutive SCIs (e.g., level 2 SCIs) to receive the PSSCH from the transmitting UE. For example, if the SCI configuration field is divided into two groups taking into account the (relatively) high SCI payload size, the SCI comprising the first SCI configuration field group may be referred to as the first SCI or first SCI and the SCI comprising the second SCI configuration field group may be referred to as the second SCI or second SCI. For example, the transmitting UE may send the first SCI to the receiving UE over the PSCCH. For example, the transmitting UE may send the second SCI to the receiving UE on the PSCCH and/or PSSCH. For example, the second SCI may be transmitted to the receiving UE over a (separate) PSCCH or may be transmitted in a piggybacked manner with the data over a PSSCH. For example, two consecutive SCIs may also be applied to different transmissions (e.g., unicast, broadcast, or multicast).

In various embodiments of the present disclosure, the PSCCH may be replaced by at least one of the SCI, the first SCI, and/or the second SCI as the transmitting UE may transmit at least one of the SCI, the first SCI, and/or the second SCI to the receiving UE over the PSCCH. Additionally/alternatively, for example, the SCI may be replaced by at least one of the PSCCH, the first SCI, and/or the second SCI. Additionally/alternatively, the PSSCH may be replaced by the second SCI, e.g., because the transmitting UE may transmit the second SCI to the receiving UE via the PSSCH.

Specifically, (a) of fig. 7 shows broadcast type SL communication, (b) of fig. 7 shows unicast type SL communication, and (c) of fig. 7 shows multicast type SL communication. In the case of unicast type SL communication, a UE may perform one-to-one communication with respect to another UE. In the case of multicast type SL transmission, a UE may perform SL communication with respect to one or more UEs in a group to which the UE belongs. In various embodiments of the present disclosure, SL multicast communications may be replaced with SL multicast communications, SL one-to-many communications, and the like.

Hereinafter, RRC connection establishment between UEs will be described.

For V2X or SL communications, the transmitting UE may need to establish (PC 5) RRC connection with the receiving UE. For example, the UE may obtain a V2X-specific SIB. For a UE configured to transmit V2X or SL communication through a higher layer and having data to transmit, if at least a frequency at which the UE is configured to transmit SL communication is included in a V2X-specific SIB, the UE may establish an RRC connection with another UE without including a transmission resource pool for the frequency. For example, if an RRC connection is established between the transmitting UE and the receiving UE, the transmitting UE may perform unicast communication with respect to the receiving UE through the established RRC connection.

When an RRC connection is established between UEs, the transmitting UE may send an RRC message to the receiving UE.

The receiving UE may perform antenna/resource demapping, demodulation, and decoding on the received information. The information may be transferred to the RRC layer via the MAC layer, RLC layer, and PDCP layer. Thus, the receiving UE may receive the RRC message generated by the transmitting UE.

V2X or SL communication may be supported for rrc_connected mode UEs, rrc_idle mode UEs, and (NR) rrc_inactive mode UEs. That is, the UE of the rrc_connected mode, the UE of the rrc_idle mode, and the UE of the (NR) rrc_inactive mode may perform V2X or SL communication. The UE in rrc_inactive mode or the UE in rrc_idle mode may perform V2X or SL communication by using a cell-specific configuration included in the V2X-specific SIB.

RRC may be used to exchange at least UE capabilities and AS layer configuration. For example, UE 1 may send UE capabilities and AS layer configuration of UE 1 to UE 2, and UE 1 may receive UE capabilities and AS layer configuration of UE 2 from UE 2. In the case of UE capability transfer, the information flow may be triggered during or after PC5-S signaling for direct link establishment.

Measurement and reporting for SL

Hereinafter, SL measurement and reporting will be described.

SL measurements and reports (e.g., RSRP, RSRQ) between UEs may be considered in the SL for QoS prediction, initial transmission parameter settings, link adaptation, link management, admission control, etc. For example, the receiving UE may receive a reference signal from the transmitting UE, and the receiving UE may measure a channel state of the transmitting UE based on the reference signal. In addition, the receiving UE may report Channel State Information (CSI) to the transmitting UE. SL related measurements and reports may include measurements and reports of CBR and reports of location information. Examples of Channel State Information (CSI) for V2X may include Channel Quality Indicator (CQI), precoding matrix index (PM), rank Indicator (RI), reference Signal Received Power (RSRP), reference Signal Received Quality (RSRQ), path gain/path loss, sounding Reference Symbol (SRS) resource indicator (SRI), SRI-RS resource indicator (CRI), interference condition, vehicle motion, etc. In the case of unicast communication, CQI, RI, and PMI or some of them may be supported in aperiodic CSI reports that are not subband-based under the assumption of four or fewer antenna ports. The CSI process may not depend on an independent Reference Signal (RS). CSI reporting may be activated or deactivated based on the configuration.

For example, the transmitting UE may transmit CSI-RS to the receiving UE, and the receiving UE may measure CQI or RI based on the CSI-RS. For example, the CSI-RS may be referred to as a SL CSI-RS. For example, CSI-RS may be limited to PSSCH transmissions. For example, the transmitting UE may perform transmission to the receiving UE by including CSI-RS on the PSSCH.

Hybrid automatic repeat request (HARQ) for SL

Hereinafter, a hybrid automatic repeat request (HARQ) process will be described.

Error compensation schemes are used to ensure communication reliability. Examples of the error compensation scheme may include a Forward Error Correction (FEC) scheme and an automatic repeat request (ARQ) scheme. In the FEC scheme, errors in the receiving end are corrected by attaching an additional error correction code to information bits. The FEC scheme has advantages in that the time delay is small and there is no additional exchange of information between the transmitting and receiving ends, but also has disadvantages in that the system efficiency may be deteriorated in a good channel environment. The ARQ scheme has advantages in that transmission reliability can be improved, but also has disadvantages in that time delay occurs and system efficiency is deteriorated in a poor channel environment.

The hybrid automatic repeat request (HARQ) scheme is a combination of the FEC scheme and the ARQ scheme. In the HARQ scheme, it is determined whether unrecoverable errors are included in data received by a physical layer, and retransmission is requested when an error is detected, thereby improving performance.

In the case of SL unicast and multicast, HARQ feedback and HARQ combining in the physical layer may be supported. For example, when the receiving UE operates in the resource allocation mode 1 or 2, the receiving UE may receive the PSSCH from the transmitting UE, and the receiving UE may transmit HARQ feedback for the PSSCH to the transmitting UE using a side link feedback control information (SFCI) format through a physical side link feedback channel (PSFCH).

For example, SL HARQ feedback may be enabled for unicast. In this case, in a non-code block group (non-CBG) operation, if the receiving UE decodes a PSCCH targeted to the receiving UE, and if the receiving UE successfully decodes a transport block related to the PSCCH, the receiving UE may generate a HARQ-ACK. In addition, the receiving UE may send a HARQ-ACK to the transmitting UE. Otherwise, if the receiving UE cannot successfully decode the transport block after decoding the PSCCH targeted to the receiving UE, the receiving UE may generate a HARQ-NACK. In addition, the receiving UE may transmit HARQ-NACK to the transmitting UE.

For example, SL HARQ feedback may be enabled for multicast. For example, in non-CBG operation, two HARQ feedback options may be supported for multicast.

(1) Multicast option 1: after the receiving UE decodes the PSCCH targeted to the receiving UE, if the receiving UE fails to decode the transport block associated with the PSCCH, the receiving UE may send HARQ-NACK to the transmitting UE via PSFCH. Otherwise, if the receiving UE decodes the PSCCH targeted to the receiving UE, and if the receiving UE successfully decodes a transport block associated with the PSCCH, the receiving UE may not transmit a HARQ-ACK to the transmitting UE.

(2) Multicast option 2: after the receiving UE decodes the PSCCH targeted to the receiving UE, if the receiving UE fails to decode the transport block associated with the PSCCH, the receiving UE may send HARQ-NACK to the transmitting UE via PSFCH. In addition, if the receiving UE decodes the PSCCH targeted to the receiving UE and if the receiving UE successfully decodes a transport block associated with the PSCCH, the receiving UE may transmit a HARQ-ACK to the transmitting UE through PSFCH.

For example, if multicast option 1 is used in SL HARQ feedback, all UEs performing multicast communication may share PSFCH resources. For example, UEs belonging to the same group may transmit HARQ feedback by using the same PSFCH resources.

For example, if multicast option 2 is used in SL HARQ feedback, each UE performing multicast communication may use different PSFCH resources for HARQ feedback transmission. For example, UEs belonging to the same group may transmit HARQ feedback by using different PSFCH resources.

In the present disclosure, HARQ-ACK may be referred to as ACK, ACK information, or positive ACK information, and HARQ-NACK may be referred to as NACK, NACK information, or negative ACK information.

Bandwidth portion and resource pool

Hereinafter, a bandwidth part (BWP) and a resource pool will be described.

When Bandwidth Adaptation (BA) is used, the reception bandwidth and transmission bandwidth of the UE do not have to be as large as the bandwidth of the cell, and the reception bandwidth and transmission bandwidth of the BS can be adjusted. For example, the network/BS may inform the UE of the bandwidth adjustment. For example, the UE receives information/configuration for bandwidth adjustment from the network/BS. In this case, the UE may perform bandwidth adjustment based on the received information/configuration. For example, bandwidth adjustment may include an increase/decrease in bandwidth, a change in the location of bandwidth, or a change in the subcarrier spacing of bandwidth.

For example, bandwidth may be reduced during periods when activity is low to save power. For example, the location of the bandwidth may be moved in the frequency domain. For example, the location of the bandwidth may be moved in the frequency domain to increase scheduling flexibility. For example, the subcarrier spacing of the bandwidth may be changed. For example, the subcarrier spacing of the bandwidth may be varied to allow for different services. A subset of the total cell bandwidth of a cell may be referred to as a bandwidth part (BWP). The BA may be performed when the BS/network configures BWP for the UE and the BS/network informs the UE of the BWP currently in an active state among the configured BWP.

For example, the BWP may be at least one of an active BWP, an initial BWP, and/or a default BWP. For example, the UE may not monitor downlink radio link quality in DL BWP other than active DL BWP on the primary cell (PCell). For example, the UE may not receive a PDCCH, a Physical Downlink Shared Channel (PDSCH), or a channel state information-reference signal (CSI-RS) (excluding RRM) outside of the active DL BWP. For example, the UE may not trigger a Channel State Information (CSI) report for the inactive DL BWP. For example, the UE may not transmit a Physical Uplink Control Channel (PUCCH) or a Physical Uplink Shared Channel (PUSCH) outside the active UL BWP. For example, in the downlink case, the initial BWP may be given as a continuous set of RBs for the Remaining Minimum System Information (RMSI) control resource set (CORESET) (configured by a Physical Broadcast Channel (PBCH)). For example, in the case of uplink, the initial BWP may be given by a System Information Block (SIB) for a random access procedure. For example, the default BWP may be configured by a higher layer. For example, the initial value of the default BWP may be the initial DL BWP. For power saving, if the UE fails to detect Downlink Control Information (DCI) during a certain period, the UE may switch the active BWP of the UE to a default BWP.

Furthermore, BWP may be defined for SL. The same SL BWP may be used for transmission and reception. For example, the transmitting UE may transmit a SL channel or SL signal on a specific BWP, and the receiving UE may receive the SL channel or SL signal on the specific BWP. In the licensed carrier, the SL BWP may be defined separately from the Uu BWP, and the SL BWP may have configuration signaling separate from the Uu BWP. For example, the UE may receive a configuration for SL BWP from the BS/network. The SL BWP may be (pre) configured in carriers relative to the out-of-coverage NR V2X UEs and rrc_idle UEs. For UEs in rrc_connected mode, at least one SL BWP may be activated in the carrier.

Referring to fig. 8, BWP1 having a bandwidth of 40MHz and a subcarrier spacing of 15kHz, BWP2 having a bandwidth of 10MHz and a subcarrier spacing of 15kHz, and BWP3 having a bandwidth of 20MHz and a subcarrier spacing of 60kHz may be configured.

Fig. 9 illustrates BWP according to one embodiment of the present disclosure. In the embodiment of fig. 9, it is assumed that the number of BWP is 3.

Referring to fig. 9, a Common Resource Block (CRB) may be a carrier resource block numbered from one end of a carrier band to the other end thereof. In addition, PRBs may be resource blocks numbered within each BWP. Point a may indicate a common reference point for the resource block grid.

BWP may be configured by point a, offset NstartBWP from point a, and bandwidth NsizeBWP. For example, point a may be an external reference point of a PRB of a carrier in which sub-carrier 0 of all parameter sets (e.g., all parameter sets supported by a network on the carrier) are aligned. For example, the offset may be the PRB spacing between the lowest subcarrier in a given parameter set and point a. For example, the bandwidth may be the number of PRBs in a given parameter set.

BWP may be defined for SL. The same SL BWP may be used for transmission and reception. For example, the transmitting UE may transmit a SL channel or SL signal on a specific BWP, and the receiving UE may receive the SL channel or SL signal on the specific BWP. In the licensed carrier, the SL BWP may be defined separately from the Uu BWP, and the SL BWP may have configuration signaling separate from the Uu BWP. For example, the UE may receive a configuration for SL BWP from the BS/network. The SL BWP may be (pre) configured in the carrier relative to the out-of-coverage NR V2X UE and the rrc_idle UE. For UEs in rrc_connected mode, at least one SL BWP may be activated in the carrier.

The resource pool may be a set of time-frequency resources that may be used for SL transmission and/or SL reception. From the UE's point of view, the time domain resources in the resource pool may not be contiguous. Multiple resource pools may be (pre) configured to UEs in one carrier. From the physical layer perspective, the UE may perform unicast, multicast, and broadcast communications by using a configured or preconfigured resource pool.

Side link congestion control

Hereinafter, side Link (SL) congestion control will be described.

If the UE autonomously determines SL transmission resources, the UE also autonomously determines the size and frequency of the resources used by the UE. Of course, the use of a resource size or frequency of use greater than or equal to a particular level may be limited due to constraints from the network or the like. However, if all UEs use a relatively large amount of resources in a case where many UEs are concentrated in a specific area at a specific time, the overall performance may be significantly deteriorated due to mutual interference.

Thus, the UE may need to observe the channel conditions. If it is determined that excessive resources are consumed, it is preferable that the UE autonomously reduces the use of resources. In the present disclosure, this may be defined as congestion Control (CR). For example, the UE may determine whether the energy measured in the unit time/frequency resource is greater than or equal to a specific level, and may adjust the usage amount and frequency of its transmission resource based on a ratio of the unit time/frequency resource in which the energy is observed to be greater than or equal to the specific level. In the present disclosure, a ratio of time/frequency resources at which energy greater than or equal to a certain level is observed may be defined as a Channel Busy Rate (CBR). The UE may measure CBR of the channel/frequency. In addition, the UE may transmit the measured CBR to the network/BS.

Referring to fig. 10, cbr may represent the number of subchannels whose measurement result value has a value greater than or equal to a pre-configured threshold as a result of measuring RSSI on a subchannel basis by a UE for a certain period (e.g., 100 ms). Alternatively, CBR may represent a ratio of subchannels having a value greater than or equal to a pre-configured threshold among subchannels within a specific duration. For example, in the embodiment of fig. 10, if it is assumed that the shadow subchannel is a subchannel having a value greater than or equal to a preconfigured threshold, CBR may represent a ratio of shadow subchannels for a 100ms period. In addition, CBR may be reported to the BS.

Fig. 11 illustrates a resource pool associated with CBR measurements.

For example, as shown in the embodiment of fig. 11, if the PSCCH and PSSCH are multiplexed, the UE may perform one CBR measurement for one resource pool. Herein, PSFCH resources may be excluded from CBR measurements if PSFCH resources are configured or preconfigured.

Further, congestion control taking into account the priority of traffic (e.g., packets) may be necessary. To this end, for example, the UE may measure a channel occupancy (CR). In particular, the UE may measure CBR, and the UE may determine a maximum value CRlimitk of channel occupancy k (CRk) that may be occupied by traffic corresponding to each priority (e.g., k) based on CBR. For example, the UE may derive a maximum value CRlimitk of the channel occupancy for the priority of each service based on a predetermined table of CBR measurements. For example, in case of traffic with a relatively high priority, the UE may derive a maximum value of a relatively large channel occupancy. Thereafter, the UE may perform congestion control by limiting the sum of channel occupancy of traffic having priority k lower than i to a value less than or equal to a specific value. Based on this approach, the channel occupancy can be more severely limited for traffic with a relatively low priority.

Further, the UE may perform SL congestion control by using methods of adjusting a transmission power level, dropping packets, determining whether to perform retransmission, adjusting a transmission RB size (MCS cooperation), and the like.

Table 10 shows examples of SL CBR and SL RSSI.

TABLE 10

Referring to table 10, the slot index may be based on a physical slot index. Table 11 shows an example of SL channel occupancy (CR).

TABLE 11

In this disclosure, the expression "configuration or definition" may be interpreted as a (pre) configuration (via predefined signaling (e.g. SIB, MAC signaling or RRC signaling)) from a base station or a network. For example, "a may be configured" may include "a base station or network (pre) configuring/defining or announcing a" for a UE. Alternatively, the phrase "configured or defined" may be interpreted as being preconfigured or defined by the system. For example, "a may be configured" may include "a is preconfigured/defined by the system".

The base station may allocate resources for transmission and reception of SL channels/signals (hereinafter referred to as "SL resources") to the UE. For example, the base station may transmit information related to the resources to the UE. In the present disclosure, a scheme in which a base station allocates SL resources to a UE may be referred to as a mode 1 scheme, a mode 1 operation, or a resource allocation mode 1.

On the other hand, the UE may select SL resources within the resource pool based on the sensing. In the present disclosure, the scheme in which the UE selects SL resources may be referred to as a mode 2 scheme, a mode 2 operation, or a resource allocation mode 3. For example, in resource allocation mode 2, the UE may detect SCI transmitted by another UE, the UE may identify resources reserved by another UE based on the SCI, and the UE may acquire RSRP measurements. And, the UE may select resources to be used for SL transmission other than the specific resources within the resource selection window based on the sensing result.

For the sensing operation, the UE may refer to resource allocation information received via the first SCI. However, due to the overhead of the first SCI, the amount of information that the UE acquires on the first SCI may be limited.

According to various embodiments of the present disclosure, the second UE may transmit additional assistance information in order to assist the sensing operation and/or the resource selection (reselection) operation of the first UE. The first UE may use the assistance information received from the second UE for PSSCH detection performance improvement and/or half duplex restriction reduction and/or reserved resource selection for transmission and reception of the specific signal, etc. In embodiments of the present disclosure, for ease of explanation, it is assumed that UE-a transmits assistance information to UE-B. It is also assumed that based on the side information received from UE-a, UE-B selects resources for PSCCH/pscsch transmitted to UE-a and/or resources for PSCCH/pscsch transmitted to UE-C (i.e., a third UE).

Fig. 12 illustrates a process by which UE-a transmits assistance information to UE-B in accordance with an embodiment of the present disclosure. The embodiment of fig. 12 may be combined with various embodiments of the present disclosure.

Referring to fig. 12, in step S1200, UE-a may transmit assistance information to UE-B. For example, the UE-B may select resources for the PSCCH/PSSCH to be transmitted to the UE-A based on the assistance information received from the UE-A, and the UE-B may use the resources to perform SL transmission. For example, UE-B may select resources for PSCCH/PSSCH to send to UE-C based on the assistance information received from UE-A, and UE-B may use the resources to perform SL transmission. In the present disclosure, the auxiliary information may be referred to as additional information or cooperation information.

According to various embodiments of the present disclosure, the UE-B may send a signal to the UE-a requesting transmission of the assistance information. Here, the auxiliary information/additional information may mean inter-UE cooperative information, and the signal requesting transmission of the auxiliary information/auxiliary information request signal/request for auxiliary information/request for additional information may mean a request for inter-UE cooperative information. That is, in the present disclosure, the auxiliary information or the additional information may mean inter-UE cooperation information.

The inter-UE cooperation information may be triggered by a request of the UE-B or a pre-configured condition. That is, the inter-UE cooperation information may be triggered and transmitted by a pre-configured condition even if there is no request of the UE-B.

Inter-UE cooperation information and/or a request for inter-UE cooperation information may be transmitted based on the PSSCH. For example, inter-UE cooperation information and/or a request for inter-UE cooperation information may be sent based on a MAC-CE (e.g., inter-UE cooperation request MAC CE, inter-UE cooperation information MAC CE). For example, inter-UE cooperation information and/or a request for inter-UE cooperation information may be transmitted based on the second SCI (second level SCI format 2-C). For example, inter-UE cooperation information and/or a request for inter-UE cooperation information may be transmitted based on the MAC-CE and the second SCI (second level SCI format 2-C).

According to embodiments of the present disclosure, UE-a may provide assistance information (i.e., information related to a scheme related to inter-UE cooperation (scheme 1)) to UE-B. In particular, the information related to scheme 1 may be information related to resource selection for (later) PSCCH/PSSCH transmission of UE-B (e.g., preferred resources related to PSCCH/PSSCH transmission or non-preferred resources related to PSCCH/PSSCH transmission).

Specifically, the information related to scheme 1 may provide information based on at least one of: i) Preferred resources, ii) non-preferred resources, iii) SL reception impossible time resources of UE-a, iv) SL reception impossible time resource information of UE-a, and/or v) resource information that UE-a performs or is scheduled to perform SL reception from another UE. As an example, the SL reception possible time resource of UE-a may be set as the preferred resource. As an example, SL reception possible time resources of UE-a may be excluded from non-preferred resources. As an example, resources that UE-a performs or is scheduled to perform SL reception from another UE may be set as non-preferred resources. As an example, resources that UE-a performs or is scheduled to perform SL reception from another UE may be set as preferred resources.

The UE-B may select PSCCH/PSSCH resources to send to UE-a or UE-C based on inter-UE cooperation information (scheme 1).

Hereinafter, in the present disclosure, 'generation of assistance information' may mean a decision of a scheme (scheme 1) or a scheme (scheme 2) related to inter-UE cooperation. As an example, 'generation of auxiliary information' may mean determining preferred resources or non-preferred resources related to scheme 1. As an example, 'generation of auxiliary information' may mean determining a conflict of reserved resources related to scheme 2.

For example, in generating the assistance information (i.e., in determining the preferred resources or non-preferred resources), the UE-a may operate as follows. The UE-a may i) determine/configure reserved resources indicated by the SCI corresponding to the second SCI (e.g., SCI format 1-a) as non-preferred resources for UE-B transmission, or ii) determine reserved resources from preferred resources for UE-B transmission according to RSRP measurement values for the case where the second SCI is not detected.

For example, the UE-a may i) determine/configure all resources to which reserved resources indicated by SCI (e.g., SCI format 1-a) corresponding to the second SCI belong as non-preferred resources for UE-B transmission, or ii) determine all resources from the preferred resources for UE-B transmission for the case that the second SCI cannot be detected when the assistance information is generated. The scheme may be limited to situations where conditions to solve the HALF-DUPLEX problem are configurable/available to generate auxiliary information. The HALF-DUPLEX problem may mean that SL reception by UE-A is not possible due to the HALF-DUPLEX operation by UE-A. According to the HALF-DUPLEX operation, SL reception is impossible when SL transmission is performed, and SL transmission is impossible when SL reception is performed. In other words, when the condition for solving the HALF-duration problem is configured at the time of generating the assistance information (determining the preferred resources or the non-preferred resources), the resources of the slot for SL reception by the UE-a may be i) determined as the non-preferred resources or ii) excluded from the preferred resources.

For example, when the UE-a fails to detect the second SCI in generating the assistance information, the UE-a may not generate the assistance information using reserved resources indicated by SCI corresponding to the second SCI (e.g., SCI format 1-a).

For example, for the case where UE-a fails to detect the second SCI when generating the assistance information, the assistance information may be generated by assuming the following cases: UE-a is the PSCCH/PSCCH and DESTINATION UE corresponding to this case. For example, for the case where UE-a fails to detect the second SCI when generating the assistance information, the assistance information may be generated by assuming the following cases: UE-a is not PSCCH/PSCCH and DSTINATION UE corresponding to this case.

Furthermore, the reference and/or its conditions may be different when the UE-a generates the assistance information. For example, the UE-a may include information about a reference or a condition of generation of the assistance information in the assistance information when transmitting the assistance information. For example, the UE-B may receive the assistance information from the UE-a, and whether to use the assistance information and/or a method for using the assistance information may be different according to the assistance information generation reference. For example, UE-B may preferentially avoid resources that UE-a expects to receive from another UE among the assistance information that UE-a sends to UE-B, and this information may be used or not for resource selection (reselection) depending on the case of resources (e.g., the number of available resources) corresponding to the high interference level observed by UE-a among the assistance information about UE-B.

Further, UE-a may perform sensing and/or SL reception in order to determine preferred and/or non-preferred resources for UE-B transmissions. In this case, a slot (hereinafter, referred to as a non-monitoring slot) in which UE-a may not perform SL reception due to the transmission or RX capability of UE-a may also be shown. By way of example, a non-monitoring slot may mean a slot where UE-A does not expect SL reception (a slot where SL reception is not possible) due to half-duplex operation of UE-A.

Furthermore, the UE-B may still perform sensing in the UE-A's non-monitored time slots. In this case, the UE-a may operate as follows. In generating/determining the preferred resources, the UE-a may exclude from the preferred resources candidate resources overlapping all or some of the reserved resources (all or some of the reserved resources derived from the resource reservation period candidate values) corresponding to the non-monitored slots. When the UE-a generates/determines non-preferred resources, the UE-a may determine candidate resources overlapping all or some of the reserved resources corresponding to the non-monitored time slots as non-preferred resources.

Due to the operation of UE-a (i.e., utilization of preferred/non-preferred resources based on the determination of UE-a), the available resources of UE-B may be unnecessarily reduced. In order to solve this problem, the following embodiments can be considered.

For example, the operation of the UE-a to generate additional information (determine preferred resources/non-preferred resources) based on reserved resources corresponding to non-monitored slots of the UE-a may be applied restrictively. In particular, preferred/non-preferred resources determined based on the non-monitored time slots of the UE-a may be used in a limited manner in case the UE-B does not use the sensing result of the UE-B for resource selection (reselection) and/or in case the sensing operation of the UE-B is not supported (in the transmission resource pool). In other words, in case the UE-B does not use the sensing result of the UE-B for resource selection (reselection) and/or in case the sensing operation of the UE-B is not supported (in the transmission resource pool), the UE-a may transmit inter-UE cooperation information including preferred/non-preferred resources determined based on reserved resources corresponding to the non-monitored time slots of the UE-a to the UE-B.

For example, when the UE-B requests the assistance information, the UE-a may be notified of information about the operation/configuration of the UE-B. As an example, the request for assistance information (request for inter-UE cooperation information) may include information on whether the sensing result of UE-B is used for resource selection (reselection) of UE-B and/or whether the sensing operation of UE-B is supported (in the transmission resource pool).

For example, the UE-a may include in the additional information generated based on reserved resources corresponding to the non-monitored time slots of the UE-a, generation references and/or conditions when transmitting the additional information to the UE-B. As an example, inter-UE cooperation information transmitted by UE-a may include information about references/conditions (e.g., whether preferred/non-preferred resources are determined based on non-monitored time slots of UE-a) used in determining preferred/non-preferred resources.

As an example, the UE-B may use the additional information (preferred/non-preferred resources determined based on the non-monitored slots of the UE-a) for resource selection (reselection) only without using the sensing result of the UE-B for resource selection (reselection). As an example, in case of resource selection (reselection) using the sensing result of the UE-B, the UE-B may not use additional information for resource selection (reselection).

Further, the UE-A may determine preferred resources and/or non-preferred resources for the UE-B transmission based on the resources from which the UE-B received the TB from another UE. In this case, when the broadcast type of the received PSSCH (i.e., the TB-related PSSCH) is multicast and/or broadcast, a plurality of UEs-a may unnecessarily generate/transmit auxiliary information based on the same resource information. In order to solve this problem, the following embodiments can be considered.

For example, UE-a may include a source ID and/or a destination ID of a TB when generating additional information for UE-B transmission resources based on resources receiving the TB from another UE. For example, the UE-a may receive additional information from another UE, and when a source ID and/or a destination ID included in the received additional information is the same as a source ID and/or a destination ID to be included in the additional information to be transmitted by the UE-a, the UE-a may omit generation and/or transmission of the additional information.

With the described embodiments, it may not be possible to unnecessarily repeat and perform the determination of preferred/non-preferred resources based on the same resource information and/or signaling including inter-UE cooperation information of preferred/non-preferred resources.

Furthermore, the UE-a may determine preferred/non-preferred resources for UE-B transmission based on the SL transmission resources (initial transmission resources and/or retransmission resources) of the UE-a or for another UE based on the SL transmission resources of the other UE indicated by the SCI and/or PSCCH received by the UE-a.

For example, a UE that may send additional information based on the SL transmission resources of UE-a may delay the starting position of the (initial) transmission resources from the starting point of the resource selection (reselection) job trigger time of UE-a or the resource selection window of UE-a to a time after the (pre) configuration threshold or the predefined threshold when performing the resource selection (reselection) of UE-a.

For example, a UE that may send additional information based on the SL transmission resources of UE-a may delay the starting position of the resource selection window from the resource selection (reselection) job trigger time of UE-a to a time after the (pre) configuration threshold or the predefined threshold when performing the resource selection (reselection) of UE-a.

For example, a UE that may send additional information based on the SL transmission resources of the UE-a may delay the starting position of the resource selection window to a time after a (pre) configured threshold or a predefined threshold with respect to the existing position when performing the resource selection (reselection) of the UE-a.

Here, the resource selection window may be determined as a time interval of n+t_1 to n+t_2. n may mean a time (or slot) that triggers the selection of a resource. T_1 may represent a parameter related to the starting position of the resource selection window. T_proc,1 (which is the upper limit value of t_1) may be defined as the number of slots according to the side-chain sub-carrier interval. T_2 may represent a number of slots equal to or less than the number of slots corresponding to the remaining packet delay budget.

For example, in this case, the value of the parameter t_1 of the starting position (e.g., n+t_1) of the resource selection window of UE-a may be allowed to be greater than the value of t_proc, 1. In other words, the value of t_1 may be configured to be a value greater than the value of t_proc,1 in order to delay the starting position of the resource selection window compared to the existing position. It can be seen that in this case, the minimum value of the parameter t_2 of the end position of the resource selection window of UE-a may be larger than t_2, min by at least a delay time. In other words, the minimum value of t_2 may be configured to be greater than t_2, min by a delay time so as to delay only the start position of the relevant window while maintaining the length of the resource selection window. For example, when the updated minimum value of t_2 is greater than the PDB value transmitted by the UE, the UE-a may not transmit additional information based on the above reference. In this case, the UE-a may perform resource selection (reselection) based on a general scheme (i.e., a resource selection window according to an existing scheme) without delay.

In embodiments of the present disclosure, when UE-a delays the location of the initial transmission resource or the beginning of the resource selection window, the delay-related value may be configured to cover the processing time of UE-a and/or the processing time of UE-B. As an example, the delay-related value may be configured to cover at least one of: i) Processing time required to generate additional information, ii) processing time required to transmit additional information, iii) processing time required for UE-B to obtain additional information, and/or iv) processing time required for UE-a to process/obtain additional information request of UE-B.

For example, a UE that may send additional information based on the SL transmission resources of the UE-a may generate and send additional information based on the reference only if the starting position of the (initial) transmission resources from the resource selection (reselection) job trigger time of the UE-a or the starting point of the resource selection window of the UE-a is equal to or greater than a (pre) configuration threshold or a predefined threshold.

For example, when UE-a generates additional information based on the SL transmission resources of UE-a, the SL transmission resources may be associated with multiple TBs and/or multiple resource reservation periods. In this case, information on how many cycles of reserved resources will be used when generating the additional information may be (pre) configured. For example, when UE-a generates additional information based on the SL transmission resources of UE-a, the SL transmission resources may be associated with multiple TBs and/or multiple resource reservation periods. In this case, the UE-a may include information on how many cycles of reserved resources will be used when generating the additional information in the additional information.

Furthermore, the factors and/or conditions for generating the additional information may be varied and the generation factors/conditions used and/or considered may be different for each resource pool. For example, additional information generation factors and/or conditions supported for each resource pool may be (pre) configured. In particular, information about factors and/or conditions for determining/generating additional information (for each resource pool) may be preconfigured or configured by the BS (e.g., RRC signaling).

For example, when UE-a is a receiver for UE-B transmission TB (i.e., an intended receiver for PSSCH transmission of UE-B), capability information regarding whether to use additional information may be exchanged between UE-a and UE-B in advance. Thereafter, operations related to the additional information (UE-a/UE-B operations) may be performed.

For example, the configuration for the additional information may be (pre) configured as one or more configurations for each resource pool. As an example, the one or more configurations for inter-UE collaboration information may be based on information preconfigured in the UE. As an example, the information including one or more configurations of inter-UE cooperation information for each resource pool may be based on configuration information received from the BS according to RRC signaling.

For example, the configuration for each additional information may include whether the additional information is scheme 1 (e.g., preferred resources and/or non-preferred resources for UE-B transmission) and/or whether the additional information is scheme 2 (e.g., whether the resources collide with reserved resources of UE-B). For example, the configuration for each additional information may include a configuration related to scheme 1 and/or a configuration related to scheme 2.

For example, the configuration for each additional information may include whether the additional information is a preferred resource and/or a non-preferred resource for UE-B transmission in scheme 1.

For example, the configuration for each additional information may include information for factors or conditions (e.g., information for a first condition) used in generating the preferred resource in scheme 1. In this case, the factors or conditions used in generating the preferred resources may be defined/configured as one or more of a plurality of factors/conditions. Hereinafter, this will be described in more detail.

As an example, resources among preferred resources included among the resources related to the transmission of the UE-B may be determined based on the information on the first condition. As an example, the resources excluded from the preferred resources among the resources related to the transmission of the UE-B may be determined based on the information on the first condition. The resources excluded from the preferred resources may be resources within a slot in which SL reception of UE-a is not performed (a slot in which SL reception of UE-a is not desired). The resources excluded from the preferred resources may be resources belonging to non-monitored time slots. As an example, the information for the first condition may be based on information indicating whether resources of a slot or the above-mentioned non-monitored slot, in which SL reception of UE-a may not be performed, are excluded from the preferred resources. That is, based on the information for the first condition, the resources of the slots or the above-described non-monitored slots, in which SL reception by UE-a may not be performed, may or may not be included in the preferred resources.

For example, the configuration for each additional information may include information for factors or conditions used when generating non-preferred resources in scheme 1. In this case, the factors or conditions used in generating the non-preferred resources may be defined/configured as one or more of a plurality of factors/conditions.

For example, the configuration for each additional information may include information indicating that the additional information transmission was triggered based on the request signal and/or based on an event in scheme 1. For example, the configuration for each additional information may include one or more pieces of information related to the event at the event-based triggering time in scheme 1. In other words, the configuration for each additional information may include information of one or more events of the event-based trigger in scheme 1.

For example, the configuration for each additional information may include information indicating the type of information to be included in the request signal at the time of the trigger based on the request signal in scheme 1.

For example, the configuration for each additional information may indicate a method for transmitting a request signal upon triggering (PDB for the additional information and source ID and/or destination ID for the request signal) based on the request in scheme 1. In other words, the configuration for each additional information may include information indicating a method for transmitting a request signal related to scheme 1.

For example, the configuration for each additional information may include information for factors or conditions used in generating the resource conflict indicator in scheme 2. In this case, the factors or conditions used in generating the non-preferred resources may be defined/configured as one or more of a plurality of factors/conditions.

For example, the configuration for each additional information may include information indicating a relationship between UE-a and UE-B in scheme 2 (whether UE-a is limited to UE-B transmission B or whether a recipient of a transmission corresponding to a collision of UE-B transmissions is allowed).

For example, the configuration for each additional information may comprise information about the condition of the UE-B (when the priority value of the reception resources of UE-a is equal to or smaller than a (pre) configuration threshold and/or the priority value of the reception values of UE-a is smaller than the priority value of the UE-B transmissions) and a parameter related to the condition of the UE-B transmissions in scheme 2 (threshold for priority value).

For example, the configuration for each additional information may include information about the condition of UE-B (among RSRP values measured for conflicting resources of UE-a side, the UE corresponding to the minimum or maximum RSPR value, the RSRP measured value limited to a value equal to or greater than a (pre) configuration threshold) and a parameter (RSRP threshold) related to the condition of UE-B transmission in scheme 2. As a specific example, the configuration for each additional information may include information about an RSRP threshold value (e.g., information for a second condition) related to RSRP measured for determining a conflict of reserved resources related to scheme 2. Hereinafter, this will be described in more detail.

The RSRP threshold determined based on the information about the second condition may be related to one or more RSRP among RSRP measured by the UE-a. As an example, the one or more RSRP may include an RSRP measured based on side chain demodulation reference signals (SL DMRS) of a predefined UE among UEs associated with the reserved resources. The predefined UE may be a UE (UE-B) determined based on a relationship between UE-A and UE-B (whether UE-A is a receiving UE for UE-B) and/or a magnitude of a measured RSRP value. As an example, the predefined UE may include a transmitting UE of the PSSCH in case of UE-a as a receiving terminal (intended recipient). As an example, the predefined UE may include a UE that transmits SCI (SCI format 1-a) indicating reserved resources to UE-a. As an example, the predefined UE may include UE-a as a transmitting UE of the PSCCH in case of an intended recipient among UEs that transmit SCI (SCI format 1-a) indicating reserved resources to UE-a. As an example, the RSRP threshold determined based on the information about the second condition may be a first RSRP threshold associated with one RSRP (e.g., RSRP-ThresPerPriority) or a second RSRP threshold associated with two RSRPs (e.g., RSRP-ThresWithRsrpMeasurement). The UE-a may determine whether the resources collide based on the RSRP measured from one of the UEs associated with the reserved resources and the first RSRP threshold. For example, the UE-a may determine a resource conflict when the measured RSRP is greater than the first RSRP threshold. The UE-a may determine the resource conflict based on RSRP (e.g., RRP1 and RSRP 2) measured from the UE associated with the reserved resources and a second RSRP threshold. For example, the UE-a may determine the resource conflict when RSRP2 (or RSRP 1) is greater than a value obtained by adding the second RSRP threshold to RSRP1 (or RSRP 2). A scheme for determining whether resources collide is illustrated for description, and an RSRP threshold determined based on information on the second condition is utilized by another scheme, and thus, a collision of reserved resources can also be determined.

For example, the preferred resources for UE-B transmission that may be included in the additional information of UE-a may be limited to a case where the number of consecutive subchannels is equal to or greater than the number of specific subchannels (e.g., a predefined number related to the number of consecutive subchannels). That is, the number of consecutive subchannels related to the preferred resource included in the additional information may be equal to or greater than a predefined number. For example, the number of specific subchannels may be a reference number of subchannels (e.g., a number of subchannels for UE-B transmission) provided when UE-B requests additional information from UE-a. For example, the specific number of sub-channels may be (pre) configured.

For example, preferred resources for UE-B transmissions that may be included in the additional information of UE-a may be limited to resources that may locate a transmission mode for the transmission of UE-B. The transmission mode may be a mode obtained based on at least one of a number of subchannels, a resource reservation period, and/or a resource reselection counter.

For example, the period of repeating the set of identical sub-channel and/or slot resources may be equal to the resource reservation period of UE-B or the resource reservation period value or (pre) configuration period value provided in the additional information request of UE-B for the preferred resources for UE-B transmission that may be included in the additional information of UE-a.

For example, the period of repeating the set of identical sub-channel and/or slot resources for preferred resources for UE-B transmission, which may be included in the additional information of UE-a, may be a resource reservation period of UE-B or a division of a resource reservation period value or a (pre) configuration period value provided in the additional information request of UE-B.

For example, for preferred resources for UE-B transmission that may be included in the additional information of UE-a, the number of cycles that repeat the same set of sub-channel and/or slot resources may be equal to i) the resource reselection counter value of UE-B, ii) the resource reselection counter value set in the additional information request of UE-B, iii) the reselection counter value indicated in the additional information, or iv) (pre) the configuration reselection counter value. Alternatively, the number of cycles may be equal to or greater than a value based on one of i) to iv) above.

For example, for a preferred resource for UE-B transmission that may be included in the additional information of UE-a, the related additional information may include information regarding the number of repetitions of a period related to the preferred resource.

For example, for a preferred resource for UE-B transmission that may be included in the additional information of UE-a, the number of times the period of the set of identical sub-channel and/or slot resources is repeated may be selected such that the product of the period of the preferred resource and the number of periods of the preferred resource is equal to or greater than the product of the resource reservation period and the resource reselection counter value provided in the additional information request or for UE-B transmission.

For example, for preferred resources for UE-B transmission that may be included in the additional information of UE-a, the set of sub-channel and/or slot resources in the first period may be present at least in a resource selection window of UE-B or a resource selection window provided in the request signal of UE-B.

For example, for preferred resources for UE-B transmission that may be included in the additional information of UE-a, the set of sub-channel and/or slot resources in the first period may be present at least before the PDB of UE-B transmission or before the PDB provided in the request signal of UE-B.

For example, for preferred resources for UE-B transmission, which may be included in the additional information of UE-a, the set of sub-channel and/or slot resources in the first period may be present at least in a (pre) configured window. For example, the present embodiment can be applied to a case where additional information transmission is not based on a request without limitation.

In embodiments of the present disclosure, constraints in the form of preferred resources that may be included in additional information of UE-a are described, but this is for convenience of description only, and embodiments may be widely applied to operation of UE-B. Specifically, the above can be widely applied to the following cases: when the UE-B receives the preferred resource from the UE-a, the UE-B cancels the use of the preferred resource for resource selection (reselection) when the form of the preferred resource does not match the transmission mode for the UE-B's transmission.

In embodiments of the present disclosure, description is made on the premise that a form of a preferred resource that can be included in the additional information of the UE-a is based on a transmission form of the UE-B or information provided in a request of the UE-B. However, this is for convenience of description only, and the above-described embodiments may not be based on a request, but may be widely applied even to an additional information transmission operation. In particular, the embodiment may be extended to replace the form of each parameter for UE-B transmission included in the additional information request with a (pre) configuration value when the additional information is operated without the additional information request.

For example, the preferred resource for UE-B transmission that may be included in the additional information of UE-a may be a larger number of groups of consecutive subchannels per slot.

Further, in the mode 2 Resource Allocation (RA), even when a transmission mode and a reserved resource of another UE overlap each other outside a resource selection window, the UE may exclude a resource corresponding to the transmission mode from the candidate single slot resources.

For example, non-preferred resources for UE-B transmission, which may be included in the additional information of UE-a, exist outside the resource selection window of UE-B, resources based on a time before a period of the resource reservation period value or resources based on a time before N periods of the UE-B transmission from the location of the non-preferred resources may be included as the additional information. For example, N may be the time before N cycles from non-preferred resources are included in the UE-B's resource selection window. For example, when non-preferred resources are expressed in the form of time and/or frequency resources and resource reservation periods in the additional information in this example, it may be additionally indicated in which period there are actual non-preferred resources. For example, when non-preferred resources are expressed in this example as time and/or frequency resources and in the form of resource reservation periods in the additional information, the first indication time may or may not also indicate actual non-preferred resources.

For example, for non-preferred resources for UE-B transmission, which may be included in the additional information of UE-a, the time and/or frequency resources within the first period may be located at least within the (pre) configuration window. For example, in order to express non-preferred resources outside the window, resources (pre) configured from the location of the non-preferred resources or at a time before a period based on a resource reservation period value indicating the association as additional information or resources at a time before N periods may be included as the additional information. For example, N may be the time before N cycles from the non-preferred resource being included in the window.

In embodiments of the present disclosure, the scheme of representing virtual resources within a window as non-preferred resources with respect to non-preferred resources outside the window may be limited to the case where the period value of the non-preferred resources is equal to or greater than a (pre) configuration value or a predefined value (e.g., a resource selection window value or t_2, a min value or a t_2 value).

In embodiments of the present disclosure, the scheme of representing virtual resources within a window as non-preferred resources with respect to non-preferred resources outside the window may be limited to a case where the position of the non-preferred resources is located within a predetermined time from the end time of the window. For example, the predetermined time may be a (pre) configuration value. For example, the predetermined time may be a resource reservation period value or a value obtained by multiplying the period value by a resource reselection counter value of the UE-B. For example, the resource reselection counter value and/or the resource reservation period value of the UE-B may be provided when the UE-B requests additional information from the UE-a.

For example, non-preferred resources for UE-B transmissions that may be included in the additional information of UE-a are present at a time after a resource reservation period value of a UE-B transmission from the end of a resource selection window of UE-B and/or at a time after a product of a resource reservation period value of a UE-B transmission from a window of a resource selection window and a resource reselection counter.

For example, the information that UE-A does not expect resources received from SL of UE-B with respect to reserved resources derived by SCI sent by UE-A from UE-B may be the case where the location of UE-A is present in a communication range request from the center of the area indicated by SCI of UE-B.

For example, the earliest time of the resources that UE-a may indicate to UE-B when indicating preferred resources and/or non-preferred resources may be a time slot (belonging to a resource pool) after a specific time from the time of transmitting additional information of UE-a or the time slot. For example, the specific time may be the sum of t_proc,0 and t_proc,1, or the value of the sum may be taken as the minimum value or the maximum value. In this case, t_proc,0 may mean a processing time of a sensing result of the UE. As an example, the resource selection (reselection) of the UE after 0 may be triggered from the time when the window in which the UE performs sensing ends (end point of sensing window) t_proc. That is, the end point of the sensing window may be a time (n-t_proc, 0) before t_proc,0 of time slot n selected (reselected) from the trigger resource. For example, the specific time is a next slot of a time at which the additional information is transmitted, and an earliest time of a resource that can be indicated in the additional information may be after a sum of t_proc,0, and t_proc indicating the time from the additional information. For example, the specific time may be (pre) configured. For example, the additional information may be transmitted in conjunction with a specific time when the additional information is transmitted.

For example, when UE-a uses multiple Time Resource Indicator Values (TRIVs) in indicating preferred and/or non-preferred resources to UE-B, the starting reference position of the TRIVs may be the last time slot or the immediately next time slot that may be indicated by the previous TVIV.

For example, when UE-a uses multiple Time Resource Indicator Values (TRIVs) in indicating preferred and/or non-preferred resources to UE-B, the starting reference position of the TRIVs may be the last time slot indicated by prior TVIV or the immediately next time slot.

For example, when the UE-a uses a plurality of Time Resource Indicator Values (TRIVs) in indicating preferred resources and/or non-preferred resources to the UE-B, the starting reference position of the TRIVs may be a succession of the starting reference positions of the previous TRIVs.

For example, when the UE-a uses a plurality of Time Resource Indicator Values (TRIVs) in indicating preferred resources and/or non-preferred resources to the UE-B, a starting reference position of the TRIVs may be indicated by the additional information. For example, a slot may be a slot belonging to a resource pool. For example, the starting reference position of the TRIV may be in various forms of a resource reservation period of UE-B transmission based on a previous starting reference position or based on a time of transmitting the additional information.

For example, a Time Resource Indicator Value (TRIV) for indicating additional information may continuously indicate resources as large as N of a predefined or (pre) configuration. For example, when the N value is predefined, the N value may be 2 or 3. For example, in the case of n=2, the value of TRIV may be determined as a combination of the first offset value and the second offset value. For example, the first offset value may be less than the second offset value.

For example, the time resource that the additional information may indicate may be a resource within a time interval from the start of the resource selection window of UE-B to t_2, min. The present embodiment takes the following problems into consideration. The end time of the actual resource selection window may vary depending on time, and in this case, the size of the time resource indicator indicated by the additional information may also be changed. In contrast, t_2, min is a (pre) configuration value, and when determining the time resource indicator based on t_2, min, the size of the time resource indicator may remain equal.

For example, when the UE indicates preferred/non-preferred resources to the UE-B, the relevant preferred and/or non-preferred resources may be indicated in the form of available resource candidates (candidate single-slot resources) for use in the mode 2 RA. In this case, when multiple available resource candidates are located in the same slot and/or in consecutive subchannels, the UE-a may use the number of subchannels to express the number of consecutive subchannels in the Frequency Resource Indicator Value (FRIV). For example, the number of consecutive subchannels of the plurality of resources may be a minimum value or a maximum value in the resource indication group for the number of consecutive subchannels. For example, the total number of subchannels in FRIV may be the total number of subchannels constituting a resource pool used by UE-a in generating the additional information. For example, the total number of subchannels in FRIV may be a value obtained by subtracting 1 (1 is the number of subchannels used for UE-B transmission) from the total number of subchannels constituting the resource pool used by UE-a in generating the additional information.

For example, it may be assumed that UE-a uses a case where UE-a derives reserved resources from SCI received from another UE when indicating preferred resources and/or non-preferred resources to UE-B. In this case, the following embodiments can be considered.

According to one embodiment, the UE-A may receive (transmission) resource pool information from the UE-B in advance for UE-B transmission. For example, the resource pool information may be provided by using PC5-RRC signaling between UE-A and UE-B.

According to one embodiment, UE-B may select UE-a among UEs using the same (transmission) resource pool when selecting UE-a.

According to one embodiment, UE-a may select UE-B among UEs using the same (transmission) resource pool when selecting UE-B.

For example, when multiple TRIVs and FRIV are combined for UE-a to indicate preferred and/or non-preferred resources to UE-B, multiple FIVs may be interlocked with a single TRIV. In this case, a different FRIV may be indicated to the discontinuous frequency resource in the same time slot with respect to the time slot indicated by the TRIV.

For example, when multiple TRIVs and FRIV are combined for UE-a to indicate preferred and/or non-preferred resources to UE-B, multiple TRIACs may be interlocked with a single FRIV.

Furthermore, the UE-B may request additional information transmission from a different UE-a. The UE-B may receive additional information from a plurality of UEs-a. In this case, it may be necessary for the UE-B to distinguish for which additional information request the received additional information is intended. For example, the UE-A may jointly transmit information (e.g., a request ID) included in the request of the UE-B when additional information is transmitted to the UE-B. For example, the UE-B may transmit a request signal including a destination ID for UE-B transmission when transmitting the request signal to the UE-a, and the UE-a may jointly transmit the destination ID again when transmitting the additional information again.

For example, the priority value for the additional information transmission and/or the additional information request transmission may be (pre) configured for at least one of the following i) to iv):

i) Resource pool, ii) congestion control range, iii) priority of UE-B transmissions corresponding to additional information, and/or iv) QoS parameters of UE-B transmissions corresponding to additional information

As a specific example, a priority value for additional information transmission and/or additional information request transmission may be preconfigured for each resource pool and congestion control range. As another example, a priority value for additional information transmission and/or additional information request transmission may be preconfigured for each QoS parameter of a UE-B transmission corresponding to the additional information.

The various embodiments of the present disclosure may be combined with each other.

In terms of implementation, the operations of the first UE (UE-a)/the second UE (UE-B) (e.g., operations related to inter-UE cooperation) according to the above-described embodiments may be processed by the devices in fig. 15 to 20 (e.g., processors 102 and 202 in fig. 16) to be described below.

Further, the operations of the first UE (UE-a)/the second UE (UE-B) (e.g., operations related to inter-UE cooperation) according to the above-described embodiments may be stored in a memory (e.g., one or more memories 104 and 204 in fig. 16) in the form of commands/programs (e.g., instructions or executable code) for driving at least one processor (e.g., 102 and 202 in fig. 16).

Hereinafter, the above-described embodiments will be described in detail according to the operation of the first UE with reference to fig. 13. The methods to be described below are merely for convenience and it goes without saying that some components of any one method may be replaced with some components of another method unless mutually exclusive, or may be applied in combination with each other.

Referring to fig. 13, a method of transmitting information related to inter-UE cooperation by a first UE in a wireless communication system according to one embodiment of the present disclosure may include: information related to inter-UE cooperation is determined (S1310) and information related to inter-UE cooperation is transmitted (S1320).

In the following description, a first UE may refer to UE-a of fig. 12, and a second UE may refer to UE-B of fig. 12. As an example, the first UE may be a UE that transmits the cooperation information to the second UE, and the second UE may be a UE that receives the cooperation information from the first UE. Hereinafter, information related to inter-UE cooperation may mean cooperation information, additional information, and auxiliary information in the above-described embodiments.

In step S1310, the first UE configures information related to inter-UE cooperation based on the configuration information. As an example, the first UE may determine preferred resources or non-preferred resources for transmission by the second UE (scheme 1). As an example, the first terminal may determine whether reserved resources collide (scheme 2). In this case, the reserved resources may mean resources reserved through SCI (first SCI, SCI format 1-a) of the second UE.

According to one embodiment, the information related to inter-UE cooperation may be based on information representing preferred resources related to scheme 1 or information representing a collision of reserved resources related to scheme 2. As an example, the information related to inter-UE cooperation may include information on preferred (or non-preferred) resources for transmission of the second UE. As an example, the information related to inter-UE cooperation may include information indicating a conflict of reserved resources.

According to one embodiment, the preferred resource may be determined among the resources related to the transmission of the second UE. As an example, the resources related to the transmission of the second UE may be resources within a predefined resource selection window. As an example, the resources related to the transmission of the second UE may be resources within a resource selection window related to PSCCH and/or PSSCH transmission. As an example, the resources related to the transmission of the second UE may be resources within a resource selection window indicated by a request of the second UE (i.e., a request for information related to inter-UE cooperation).

According to one embodiment, the collision of reserved resources may be determined based on RSRP measured by the first UE.

According to one embodiment, the configuration information may comprise information about i) a first condition related to the determination of the preferred resource and ii) a second condition related to the determination of the conflict of reserved resources. The implementation may be based on implementations related to configuration for additional information.

Based on the information about the first condition, a preferred resource may be determined among the resources related to the transmission of the second UE.

As an example, the resources excluded from the preferred resources among the resources related to the transmission of the second UE may be determined based on the information on the first condition. The resources excluded from the preferred resources may be resources belonging to a predefined time slot. The predefined time slots (e.g., non-monitoring time slots) may include time slots in which Side Link (SL) reception of the first UE is not performed.

Based on the first condition, many resources are not significantly excluded in determining the preferred resources, so that the problem of the available resources for the transmission of the second UE becoming shorter can be prevented.

As an example, resources included in the preferred resources among the resources related to the transmission of the second UE may be determined based on the information on the first condition.

Based on the first condition, many resources are not explicitly included in determining the preferred resources to prevent the accuracy from being reduced due to the preferred resources for inter-UE cooperation.

The collision of reserved resources may mean a collision between resources reserved by SCI (first SCI) received by the first UE. In this case, the reserved resources may be resources overlapping in the time domain and the frequency domain. The first terminal may determine whether reserved resources collide based on the measured RSRP and the determined RSRP threshold. Hereinafter, an RSRP threshold used in determining whether reserved resources collide will be described in detail.

Based on the information about the second condition, an RSRP threshold associated with the RSRP measured by the first UE may be determined.

The RSRP threshold determined based on the information about the second condition may be related to one or more RSRP among RSRP measured by the first UE. In this case, the RSRP measured by the first UE is based on the RSRP measured according to the SCI (first SCI) indicating the reserved resources. As a specific example, when the first UE receives the first SCI from each of the two UEs, the RSRP measured by the first UE includes an RSRP measured based on the first SCI.

As an example, the determined RSRP threshold may be related to one RSRP among RSRP measured by the first UE. As a specific example, when the number of RSRP measured by the first UE is 2, the first UE may determine whether reserved resources collide based on an RSRP threshold value related to one RSRP of the two RSRPs. For example, the first UE may determine a conflict of reserved resources based on one RSRP being greater than a determined RSRP threshold.

As an example, the determined RSRP threshold may be related to two RSRP among the RSRPs measured by the first UE. The first UE may determine a conflict of reserved resources based on RSRP1, RSRP2, and the determined RSRP threshold. As a specific example, the first UE may determine a collision of reserved resources when RSRP1> rsrp2+ determines an RSRP threshold (or rsrp2> rsrp1+ determines an RSRP threshold).

According to one embodiment, the one or more RSRP may include RSRP measured based on a side link demodulation reference signal (SL DMRS) of a predefined UE among UEs related to the reserved resources. The UE associated with the reserved resources may be based on the UE transmitting first side link control information (SCI) indicating the reserved resources to the first UE.

It may be assumed that the first UE receives a case of the first SCI indicating reserved resources from each of two UEs (a second UE and a third UE different from the second UE).

The predefined UE may be a second UE or a third UE based on an RSRP threshold associated with one RSRP for determining the conflict of reserved resources. That is, the first UE may determine whether reserved resources of the second UE and reserved resources of the third UE collide with each other based on i) RSRP measured based on the SL DMRS related to SCI of the second UE (or the third UE) and ii) RSRP threshold.

The predefined UE may be a second UE or a third UE based on RSRP thresholds related to two RSRP for determining a conflict of reserved resources. That is, the first UE may determine whether reserved resources of the second UE and reserved resources of the third UE collide with each other based on i) RSRP (e.g., RSRP 1) measured based on the SL DMRS related to the SCI of the second UE, ii) RSRP (e.g., RSRP 2) measured based on the SL DMRS related to the SCI of the third UE, and iii) RSRP threshold.

Based on the second condition, an RSRP threshold that best suits the capabilities related to the measurement of the first UE may be utilized. That is, the accuracy of information representing a conflict of reserved resources can be improved.

According to one embodiment, the configuration information may be based on pre-configuration information or information received from the BS based on RRC signaling. As an example, the configuration information may be information preconfigured when the first UE is implemented. As an example, the configuration information may be information received from the BS. In this case, the first UE may receive configuration information from the BS based on RRC signaling.

The configuration information may be the high-level parameters SL-InterUE-CoordinationConfig. In this case, the first condition may be determined/indicated/configured based on information in SL-InterUE-CoordinationScheme1 of SL-InterUE-CoordinationConfig. As an example, the first Condition may be determined based on SL-Condition1-a-2 within SL-InterUE-CoordinationScheme. The SL-Condition1-a-2 may be information indicating whether resources belonging to slots not performing (undesired) SL reception of the first UE are excluded from the preferred resources due to half duplex operation. As an example, based on the SL-Condition1-a-2 being set to 'disabled', the first UE does not exclude resources belonging to slots that do not perform (undesired) SL reception from the preferred resources when determining the preferred resources. As an example, based on the SL-Condition1-a-2 not being set to 'disabled', the first UE excludes resources belonging to slots that do not perform (undesired) SL reception from the preferred resources when determining the preferred resources.

The second condition may be determined/indicated/configured based on information in SL-InterUE-CoordinationScheme2 of SL-InterUE-CoordinationConfig. As an example, the second condition may be determined based on SL-OptionForCondition-A-1 of SL-InterUE-CoordinationScheme 2. sl-OptionForCondition-a-1 may be information representing the RSRP threshold used in determining the collision of reserved resources. As an example, the use of an RSRP threshold (e.g., RSRP-ThresPerPriorities) associated with one RSRP may be determined based on the value of sl-OptionForCondition2-A-1 being 0. As an example, the use of an RSRP threshold (e.g., RSRP-ThresWithRsrpMeasurement) associated with two RSRPs may be determined based on the value of sl-OptionForCondition2-A-1 being 1.

According to S1310 described above, the operation of the first UE (reference numeral 100/200 in fig. 15 to 20) determining information related to inter-UE cooperation based on the configuration information may be implemented by the apparatus in fig. 15 to 20. For example, referring to fig. 16, the one or more processors 102 may control the one or more transceivers 106 and/or the one or more memories 104 to determine information related to inter-UE cooperation based on the configuration information.

At S1320, the first UE transmits information related to inter-UE cooperation to the second UE. Information related to inter-UE cooperation may be transmitted through a physical side link shared channel (PSSCH). As an example, information related to inter-UE cooperation may be transmitted based on the second level SCI and/or a medium access control-control element (MAC-CE). As an example, information related to inter-UE cooperation may be included in the second level SCI. The first terminal may send the second level SCI to the second UE. As an example, information related to inter-UE cooperation may be included in a MAC-CE (e.g., inter-UE cooperation information MAC CE). The first terminal may transmit the MAC-CE to the second UE.

Information related to inter-UE cooperation may be transmitted based on a predefined condition or a request of a second UE (e.g., a signal for requesting assistance information transmission or a request for inter-UE cooperation information). That is, transmission of information related to inter-UE cooperation may be triggered based on a predefined condition or a request of the second UE.

According to one embodiment, information indicating preferred resources (or non-preferred resources) related to the above scheme 1 may be transmitted in association with a request of a second UE based on information related to inter-UE cooperation. As an example, the request of the second UE may be a request for inter-UE cooperation information related to a preferred resource or a non-preferred resource. The request may be received based on a media access control-control element (MAC-CE) and/or a second SCI. As an example, the first UE may receive a MAC-CE and/or a second SCI including information related to the request.

According to S1320 described above, the operation of the first UE (reference numeral 100/200 in fig. 15 to 20) transmitting information related to inter-UE cooperation to the second UE (reference numeral 100/200 in fig. 15 to 20) may be implemented by the apparatus in fig. 15 to 20. For example, referring to fig. 16, the one or more processors 102 may control the one or more transceivers 106 and/or the one or more memories 104 to transmit information related to inter-UE cooperation to the second UE 200.

The method may further comprise a SCI receiving step. As an example, the first UE receives first side link control information (SCI) from the second UE. As an example, the first UE receives the first SCI from the third UE. As an example, the first UE receives first side link control information (SCI) from each of the second UE and the third UE.

The first SCI may be associated with reserved resources for transmission of a physical side link shared channel (PSSCH). The SCI receiving step may be performed prior to S1310. As an example, the first UE may determine a collision between resources reserved based on the first SCI of the second UE and resources reserved based on the first SCI of the third UE.

According to the SCI receiving step, the operation of the first UE (reference numeral 100/200 in fig. 15 to 20) receiving the first SCI from the second UE (reference numeral 100/200 in fig. 15 to 20) may be implemented by the apparatus in fig. 15 to 20. For example, referring to fig. 16, the one or more processors 102 may control the one or more transceivers 106 and/or the one or more memories 104 to receive the first SCI from the second UE 200.

The method may further include the step of receiving a request for information related to inter-UE cooperation. Specifically, the first UE receives a request from the second UE for information related to inter-UE cooperation. The request receiving step may be performed before S1310. The request for information related to inter-UE cooperation may relate to preferred resources or non-preferred resources for transmission of the second UE. As an example, the first UE may transmit information indicating a preferred resource (information related to inter-UE cooperation) to the second UE based on the request. As an example, the first UE may transmit information indicating non-preferred resources (information related to inter-UE cooperation) to the second UE based on the request.

According to the request receiving step, the operation of the first UE (reference numeral 100/200 in fig. 15 to 20) to receive a request for information related to inter-UE cooperation from the second UE (reference numeral 100/200 in fig. 15 to 20) may be implemented by the apparatus in fig. 15 to 20. For example, referring to fig. 16, the one or more processors 102 may control the one or more transceivers 106 and/or the one or more memories 104 to receive a request from the second UE 200 for information related to inter-UE collaboration.

According to the embodiments (SCI receiving step and request receiving step), the first UE may perform steps S1310 to S1320 based on one of the following 1) to 3).

1) Determining information related to inter-UE cooperation (S1310) -transmitting information related to inter-UE cooperation (S1320)

2) Receiving a request for information related to inter-UE cooperation-determining information related to inter-UE cooperation (S1310) -transmitting information related to inter-UE cooperation (e.g., information representing preferred resources) (S1320)

3) Receiving SCI-determining information related to inter-UE cooperation (S1310) -transmitting information related to inter-UE cooperation (e.g., information indicating a conflict of reserved resources) (S1320)

Hereinafter, the above-described embodiments will be described in detail according to the operation of the second UE with reference to fig. 14. The methods to be described below are merely for convenience and it goes without saying that some of the constituent elements of any one method may be replaced with some of the constituent elements of another method unless mutually exclusive, or may be applied in combination with each other.

Referring to fig. 14, a method of receiving information related to inter-UE cooperation by a second UE in a wireless communication system according to another embodiment of the present disclosure may include: information related to inter-UE cooperation is received (S1410).

In the following description, the second UE may refer to UE-B of fig. 12, and the first UE may refer to UE-a of fig. 12. As an example, the second UE may be a UE that receives the cooperation information from the first UE, and the first UE may be a UE that transmits the cooperation information to the second UE. Hereinafter, information related to inter-UE cooperation may mean cooperation information, additional information, and auxiliary information in the above-described embodiments.

At S1410, the second UE receives information related to inter-UE cooperation from the first UE.

Information related to inter-UE cooperation may be determined based on the configuration information. Specifically, the information related to inter-UE cooperation may be based on information determined by the first UE according to the configuration information. As an example, the first UE may determine preferred resources or non-preferred resources for transmission by the second UE (scheme 1). As an example, the first terminal may determine whether reserved resources collide (scheme 2). In this case, the reserved resources may mean resources reserved by SCI (first SCI, SCI format 1-a) of the second UE.

The second condition may be determined/indicated/configured based on information in SL-InterUE-CoordinationScheme2 of SL-InterUE-CoordinationConfig. As an example, the second condition may be determined based on SL-OptionForCondition-A-1 of SL-InterUE-CoordinationScheme 2. sl-OptionForCondition-a-1 may be information representing the RSRP threshold used in determining the collision of reserved resources. As an example, the use of an RSRP threshold (e.g., RSRP-ThresPerPriority) associated with one RSRP may be determined based on the value of sl-OptionForCondition2-A-1 being 0. As an example, the use of an RSRP threshold (e.g., RSRP-ThresWithRsrpMeasurement) associated with two RSRPs may be determined based on the value of sl-OptionForCondition2-A-1 being 1.

Information related to inter-UE cooperation may be received through a physical side link shared channel (PSSCH). As an example, information related to inter-UE cooperation may be received based on the second level SCI and/or a medium access control-control element (MAC-CE). As an example, information related to inter-UE cooperation may be included in the second level SCI. The second UE may receive the second level SCI from the first UE. As an example, information related to inter-UE cooperation may be included in a MAC-CE (e.g., inter-UE cooperation information MAC CE). The second UE may receive the MAC-CE from the first UE.

Information related to inter-UE cooperation may be received based on a predefined condition or a request of a second UE (e.g., a signal for requesting assistance information transmission or a request for inter-UE cooperation information). That is, transmission of information related to inter-UE cooperation may be triggered based on a predefined condition or a request of the second UE.

According to one embodiment, information indicating preferred resources (or non-preferred resources) related to the above scheme 1 may be received in relation to a request of a second UE based on information related to inter-UE cooperation. As an example, the request of the second UE may be a request for inter-UE cooperation information related to a preferred resource or a non-preferred resource. The request may be sent based on a media access control-control element (MAC-CE) and/or a second SCI. As an example, the second UE may transmit a MAC-CE and/or a second SCI including information related to the request.

According to S1410 described above, the operation of the second UE (reference numeral 100/200 in fig. 15 to 20) to receive information related to inter-UE cooperation from the first UE (reference numeral 100/200 in fig. 15 to 20) may be implemented by the apparatus in fig. 15 to 20. For example, referring to fig. 16, the one or more processors 202 may control the one or more transceivers 206 and/or the one or more memories 204 to receive information related to inter-UE cooperation from the first UE 100.

The second UE may select or reselect resources for PSSCH transmission based on information related to inter-UE cooperation.

According to one embodiment, the method may further comprise a resource selection step. The second UE may select a resource for transmission of a physical side link shared channel (PSSCH) based on information indicating a preferred resource related to the above scheme 1. In this case, the resources used for transmission of the PSSCH may include preferred resources.

According to the resource selection step, the operation of the second UE (reference numeral 100/200 in fig. 15 to 20) to select a resource for transmission of the PSSCH based on information representing a preferred resource related to the above-described scheme 1 can be implemented by the apparatus in fig. 15 to 20. For example, referring to fig. 16, the one or more processors 202 may control the one or more transceivers 206 and/or the one or more memories to select resources for transmission of a physical side chain shared channel (PSSCH) based on information representing preferred resources associated with scheme 1 above.

According to one embodiment, the method may further comprise a SCI transmitting step. Specifically, the second UE receives the first SCI to the first UE.

The first SCI may be associated with reserved resources for transmission of a physical side link shared channel (PSSCH). The SCI transmission step may be performed before S1410. As an example, the first UE may determine a collision between reserved resources based on the first SCI of the second UE. The second UE may receive information (information related to inter-UE cooperation) indicating a collision of reserved resources.

According to the SCI transmission step, the operation of the second UE (reference numeral 100/200 in fig. 15 to 20) to transmit the first SCI to the first UE (reference numeral 100/200 in fig. 15 to 20) may be implemented by the apparatus in fig. 15 to 20. For example, referring to fig. 16, the one or more processors 202 can control the one or more transceivers 206 and/or the one or more memories 204 to transmit the first SCI to the first UE 100.

According to one embodiment, the method may further comprise a resource reselection step. Specifically, the second UE may reselect resources for transmission of the PSSCH based on information indicating a collision of reserved resources related to the above scheme 2. The resources associated with the collision (i.e., the resources served by the first SCI) may be excluded from the resources used for transmission of the PSSCH.

According to the resource reselection step, the operation of the second UE (reference numeral 100/200 in fig. 15 to 20) to reselect resources for transmission of the PSSCH based on information representing collision of reserved resources related to the above-described scheme 2 may be implemented by the apparatus in fig. 15 to 20. For example, referring to fig. 16, the one or more processors 202 may control the one or more transceivers 206 and/or the one or more memories to reselect resources for transmission of a physical side link shared channel (PSSCH) based on information representative of a collision of reserved resources associated with scheme 2 above.

According to one embodiment, the method may further comprise the step of sending a request for information related to inter-UE cooperation. Specifically, the second UE sends a request to the first UE for information related to inter-UE cooperation. The request transmission step may be performed before S1410. The request for information related to inter-UE cooperation may relate to preferred resources or non-preferred resources for transmission of the second UE. As an example, the second UE may receive information (information related to inter-UE cooperation) indicating a preferred resource based on a request from the first UE. As an example, the second UE may receive information (information related to inter-UE cooperation) representing non-preferred resources based on a request from the first UE.

According to the request transmission step, the operation of the second UE (reference numeral 100/200 in fig. 15 to 20) to transmit a request for information related to inter-UE cooperation to the first UE (reference numeral 100/200 in fig. 15 to 20) may be implemented by the apparatus in fig. 15 to 20. For example, referring to fig. 16, the one or more processors 202 may control the one or more transceivers 206 and/or the one or more memories 204 to send a request to the first UE 100 for information related to inter-UE collaboration.

According to an embodiment (resource selection step, SCI transmission step, resource reselection step, and request transmission step), the second UE may perform S1410 based on one of the following 1) to 5).

1) Receiving information related to inter-UE cooperation (S1410)

2) Transmitting a request for information related to inter-UE cooperation-receiving information related to inter-UE cooperation (S1410)

3) Transmitting a request for information related to inter-UE cooperation-receiving information related to inter-UE cooperation (e.g., information representing preferred resources) (S1410) -selecting resources for PSSCH transmission

4) Transmitting SCI-receiving information related to inter-UE cooperation (S1410)

5) Transmitting SCI-receiving information related to inter-UE cooperation (e.g., information indicating collision of reserved resources) (S1410) -reselecting resources for PSSCH transmission

Hereinafter, an apparatus to which various embodiments of the present disclosure may be applied will be described.

The various descriptions, functions, procedures, proposals, methods and/or operational flowcharts of the present disclosure described in this document may be applied to, but are not limited to, various fields in which wireless communication/connection (e.g., 5G) between devices is required.

Hereinafter, a description will be given in more detail with reference to the accompanying drawings. In the following figures/descriptions, like reference numerals may designate like or corresponding hardware, software, or functional blocks unless otherwise described.

Fig. 15 illustrates a communication system 1 according to one embodiment of the present disclosure.

Referring to fig. 15, a communication system 1 to which various embodiments of the present disclosure are applied includes a wireless device, a Base Station (BS), and a network. Herein, a wireless device refers to a device that performs communication using a Radio Access Technology (RAT) (e.g., 5G New RAT (NR)) or Long Term Evolution (LTE)), and may be referred to as a communication/radio/5G device. Wireless devices may include, but are not limited to, robots 100a, vehicles 100b-1 and 100b-2, augmented reality (XR) devices 100c, handheld devices 100d, home appliances 100e, internet of things (IoT) devices 100f, and Artificial Intelligence (AI) devices/servers 400. For example, the vehicles may include vehicles having wireless communication functions, autonomously driven vehicles, and vehicles capable of performing communication between the vehicles. Herein, the vehicle may include an Unmanned Aerial Vehicle (UAV) (e.g., an unmanned aerial vehicle). XR devices may include Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality (MR) devices, and may be implemented in the form of head-mounted devices (HMDs), head-up displays (HUDs) installed in vehicles, televisions, smartphones, computers, wearable devices, home appliances, digital signage, vehicles, robots, and the like. The handheld devices may include smart phones, smart boards, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., notebooks). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors and smart meters. For example, the BS and network may be implemented as wireless devices, and a particular wireless device 200a may operate as a BS/network node with respect to other wireless devices.

The wireless devices 100a to 100f may connect to the network 300 via the BS 200. AI technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may connect to the AI server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although the wireless devices 100a to 100f may communicate with each other through the BS 200/network 300, the wireless devices 100a to 100f may perform direct communication (e.g., side link communication) with each other without going through the BS/network. For example, the vehicles 100b-1 and 100b-2 may perform direct communications (e.g., vehicle-to-vehicle (V2V)/vehicle-to-everything (V2X) communications). The IoT devices (e.g., sensors) may perform direct communications with other IoT devices (e.g., sensors) or other wireless devices 100 a-100 f.

Wireless communication/connection 150a, 150b, or 150c may be established between wireless devices 100 a-100 f/BS200 or BS200/BS 200. Herein, wireless communication/connection may be established through various RATs (e.g., 5G NR) such as uplink/downlink communication 150a, side link communication 150b (or D2D communication), or inter-BS communication (e.g., relay, integrated Access Backhaul (IAB)). The wireless device and BS/wireless device may transmit/receive radio signals to/from each other through wireless communication/connections 150a and 150 b. For example, wireless communication/connections 150a and 150b may transmit/receive signals over various physical channels. To this end, at least a portion of various configuration information configuration processes, various signal processing processes (e.g., channel coding/decoding, modulation/demodulation, and resource mapping/demapping) and resource allocation processes for transmitting/receiving radio signals may be performed based on various proposals of the present disclosure.

Referring to fig. 16, the first and second wireless devices 100 and 200 may transmit radio signals through various RATs (e.g., LTE and NR). Herein, { first wireless device 100 and second wireless device 200} may correspond to { wireless device 100x and BS200} and/or { wireless device 100x and wireless device 100x } of fig. 15.

The first wireless device 100 may include one or more processors 102 and one or more memories 104, and additionally include one or more transceivers 106 and/or one or more antennas 108. The processor 102 may control the memory 104 and/or the transceiver 106 and may be configured to implement the descriptions, functions, procedures, proposals, methods and/or operational flowcharts disclosed in this document. For example, the processor 102 may process the information within the memory 104 to generate first information/signals and then transmit radio signals including the first information/signals through the transceiver 106. The processor 102 may receive a radio signal including the second information/signal through the transceiver 106 and then store information obtained by processing the second information/signal in the memory 104. The memory 104 may be connected to the processor 102 and may store various information related to the operation of the processor 102. For example, the memory 104 may store software code including instructions for executing some or all of the processes controlled by the processor 102 or for executing descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in this document. Herein, the processor 102 and the memory 104 may be part of a communication modem/circuit/chip designed to implement a RAT (e.g., LTE or NR). The transceiver 106 may be coupled to the processor 102 and transmit and/or receive radio signals via one or more antennas 108. Each transceiver 106 may include a transmitter and/or a receiver. The transceiver 106 may be used interchangeably with a Radio Frequency (RF) unit. In this disclosure, a wireless device may represent a communication modem/circuit/chip.

The second wireless device 200 may include one or more processors 202 and one or more memories 204, and additionally include one or more transceivers 206 and/or one or more antennas 208. The processor 202 may control the memory 204 and/or the transceiver 206 and may be configured to implement the descriptions, functions, procedures, proposals, methods and/or operational flowcharts disclosed in this document. For example, the processor 202 may process the information within the memory 204 to generate a third information/signal and then transmit a radio signal including the third information/signal through the transceiver 206. The processor 202 may receive a radio signal including the fourth information/signal via the transceiver 106 and then store information obtained by processing the fourth information/signal in the memory 204. The memory 204 may be connected to the processor 202 and may store various information related to the operation of the processor 202. For example, the memory 204 may store software code including instructions for executing some or all of the processes controlled by the processor 202 or for executing descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in this document. Herein, the processor 202 and the memory 204 may be part of a communication modem/circuit/chip designed to implement a RAT (e.g., LTE or NR). The transceiver 206 may be connected to the processor 202 and transmit and/or receive radio signals through one or more antennas 208. Each transceiver 206 can include a transmitter and/or a receiver. The transceiver 206 may be used interchangeably with a Radio Frequency (RF) unit. In this disclosure, a wireless device may represent a communication modem/circuit/chip.

Hereinafter, hardware elements of the wireless devices 100 and 200 will be described in more detail. One or more protocol layers may be implemented by, but are not limited to, one or more processors 102 and 202. For example, one or more of processors 102 and 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC and SDAP). The one or more processors 102 and 202 may generate one or more Protocol Data Units (PDUs) and/or one or more Service Data Units (SDUs) based on the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document. One or more processors 102 and 202 may generate messages, control information, data, or information based on descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in this document. The one or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information based on the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document and provide the generated signals to the one or more transceivers 106 and 206. The one or more processors 102 and 202 may receive signals (e.g., baseband signals) from the one or more transceivers 106 and 206 and obtain PDUs, SDUs, messages, control information, data, or information based on the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document.

One or more of the processors 102 and 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer. One or more of the processors 102 and 202 may be implemented in hardware, firmware, software, or a combination thereof. As an example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs) may be included in the one or more processors 102 and 202. The descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in this document may be implemented using firmware or software, and the firmware or software may be configured to include modules, procedures or functions. Firmware or software configured to perform the descriptions, functions, procedures, proposals, methods and/or operational flow diagrams disclosed in this document may be included in the one or more processors 102 and 202 or stored in the one or more memories 104 and 204 to be driven by the one or more processors 102 and 202. The descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in this document may be implemented using firmware or software in the form of codes, commands and/or command sets.

One or more memories 104 and 204 may be coupled to one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, code, instructions, and/or commands. One or more of the memories 104 and 204 may be configured by read-only memory (ROM), random Access Memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, a hard drive, registers, cache memory, a computer-readable storage medium, and/or combinations thereof. The one or more memories 104 and 204 may be located internal and/or external to the one or more processors 102 and 202. The one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 by various techniques, such as a wired or wireless connection.

One or more transceivers 106 and 206 may transmit the user data, control information, and/or radio signals/channels referred to in the methods and/or operational flow diagrams of this document to one or more other devices. One or more transceivers 106 and 206 may receive the user data, control information, and/or radio signals/channels mentioned in the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document from one or more other devices. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and transmit and receive radio signals. For example, the one or more processors 102 and 202 may perform control such that the one or more transceivers 106 and 206 may transmit user data, control information, or radio signals to one or more other devices. The one or more processors 102 and 202 may perform control such that the one or more transceivers 106 and 206 may receive user data, control information, or radio signals from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208, and one or more transceivers 106 and 206 may be configured to transmit and receive the user data, control information, and/or radio signals/channels mentioned in the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document through one or more antennas 108 and 208. In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). The one or more transceivers 106 and 206 may convert received radio signals/channels, etc., from RF band signals to baseband signals for processing received user data, control information, radio signals/channels, etc., using the one or more processors 102 and 202. The one or more transceivers 106 and 206 may convert user data, control information, radio signals/channels, etc., processed using the one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more of the transceivers 106 and 206 may include (analog) oscillators and/or filters.

Referring to fig. 17, the signal processing circuit 1000 may include a scrambler 1010, a modulator 1020, a layer mapper 1030, a precoder 1040, a resource mapper 1050, and a signal generator 1060. The operations/functions of fig. 17 may be performed by the processors 102 and 202 and/or transceivers 106 and 206 of fig. 16, but are not limited thereto. The hardware elements of fig. 17 may be implemented by the processors 102 and 202 and/or transceivers 106 and 206 of fig. 16. For example, blocks 1010 through 1060 may be implemented by processors 102 and 202 of fig. 16. Alternatively, blocks 1010 through 1050 may be implemented by processors 102 and 202 of fig. 16, and block 1060 may be implemented by transceivers 106 and 206 of fig. 16.

The codeword may be converted into a radio signal via the signal processing circuit 1000 of fig. 17. Herein, a codeword is a coded bit sequence of an information block. The information blocks may include transport blocks (e.g., UL-SCH transport blocks, DL-SCH transport blocks). The radio signal may be transmitted through various physical channels (e.g., PUSCH and PDSCH).

In particular, the codeword may be converted into a bit sequence that is scrambled by the scrambler 1010. The scrambling sequence for scrambling may be generated based on an initialization value, and the initialization value may include ID information of the wireless device. The scrambled bit sequence may be modulated into a modulation symbol sequence by modulator 1020. The modulation schemes may include pi/2-binary phase shift keying (pi/2-BPSK), m-phase shift keying (m-PSK), and m-quadrature amplitude modulation (m-QAM). The complex modulation symbol sequence may be mapped to one or more transport layers by layer mapper 1030. The modulation symbols for each transport layer may be mapped (precoded) by precoder 1040 to corresponding antenna ports. The output z of the precoder 1040 may be obtained by multiplying the output y of the layer mapper 1030 by an n×m precoding matrix W. Herein, N is the number of antenna ports and M is the number of transmission layers. The precoder 1040 may perform precoding after performing transform precoding (e.g., DFT) on the complex modulation symbols. Alternatively, the precoder 1040 may perform precoding without performing transform precoding.

The resource mapper 1050 may map modulation symbols for each antenna port to time-frequency resources. The time-frequency resources may include a plurality of symbols (e.g., CP-OFDMA symbols and DFT-s-OFDMA symbols) in the time domain and a plurality of subcarriers in the frequency domain. The signal generator 1060 may generate a radio signal from the mapped modulation symbols, and the generated radio signal may be transmitted to other devices through respective antennas. To this end, the signal generator 1060 may include an Inverse Fast Fourier Transform (IFFT) module, a Cyclic Prefix (CP) inserter, a digital-to-analog converter (DAC), and a frequency up-converter.

The signal processing of the signals received in the wireless device may be configured in a reverse manner of the signal processing 1010 through 1060 of fig. 17. For example, a wireless device (e.g., 100 and 200 of fig. 16) may receive radio signals from outside through an antenna port/transceiver. The received radio signal may be converted into a baseband signal by a signal restorer. To this end, the signal restorer may include a frequency downlink converter, an analog-to-digital converter (ADC), a CP remover, and a Fast Fourier Transform (FFT) module. The baseband signal may then be recovered into a codeword by a resource demapper process, a post-coding process, a demodulation process, and a descrambling process. The codeword may be restored to the original information block by decoding. Thus, the signal processing circuit (not shown) of the received signal may include a signal restorer, a resource demapper, a post-encoder, a demodulator, a descrambler, and a decoder.

Fig. 18 illustrates another example of a wireless device according to one embodiment of the present disclosure. The wireless device may be implemented in various forms based on usage/services (refer to fig. 15).

Referring to fig. 18, wireless devices 100 and 200 may correspond to wireless devices 100 and 200 of fig. 16 and may be configured by various elements, components, units/portions, and/or modules. For example, each of the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and an additional component 140. The communication unit may include a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 may include one or more processors 102 and 202 and/or one or more memories 104 and 204 of fig. 16. For example, transceiver 114 may include one or more transceivers 106 and 206 and/or one or more antennas 108 and 208 of fig. 16. The control unit 120 is electrically connected to the communication unit 110, the memory 130, and the additional components 140, and controls the overall operation of the wireless device. For example, the control unit 120 may control the electrical/mechanical operation of the wireless device based on programs/codes/commands/information stored in the memory unit 130. The control unit 120 may transmit information stored in the memory unit 130 to the outside (e.g., other communication devices) via the communication unit 110 through a wireless/wired interface, or store information received from the outside (e.g., other communication devices) via the communication unit 110 through a wireless/wired interface in the memory unit 130.

The additional components 140 may be configured differently based on the type of wireless device. For example, the additional component 140 may include at least one of a power supply unit/battery, an input/output (I/O) unit, a driving unit, and a computing unit. The wireless device may be implemented in the form of, but not limited to, a robot (100 a of fig. 15), a vehicle (100 b-1 and 100b-2 of fig. 15), an XR device (100 c of fig. 15), a handheld device (100 d of fig. 15), a home appliance (100 e of fig. 15), an IoT device (100 f of fig. 15), a digital broadcast terminal, a holographic device, a public safety device, an MTC device, a medical device, a financial technology device (or a financial device), a security device, a climate/environment device, an AI server/device (400 of fig. 15), a BS (200 of fig. 15), a network node, etc. The wireless device may be used in a mobile or fixed location based on the use case/service.

In fig. 18, various elements, components, units/portions and/or modules in the wireless devices 100 and 200 may all be connected to each other through wired interfaces, or at least a portion thereof may be connected wirelessly through the communication unit 110. For example, in each of the wireless devices 100 and 200, the control unit 120 and the communication unit 110 may be connected by wire, and the control unit 120 and the first unit (e.g., 130 and 140) may be connected wirelessly through the communication unit 110. The various elements, components, units/portions and/or modules within wireless devices 100 and 200 may also include one or more elements. For example, the control unit 120 may be configured by a set of one or more processors. As an example, the control unit 120 may be configured by a set of a communication control processor, an application processor, an Electronic Control Unit (ECU), a graphics processing unit, and a memory control processor. As another example, the memory 130 may be configured by Random Access Memory (RAM), dynamic RAM (DRAM), read Only Memory (ROM), flash memory, volatile memory, non-volatile memory, and/or combinations thereof.

Hereinafter, an example of implementing fig. 18 will be described in detail with reference to the accompanying drawings.

Fig. 19 illustrates a handheld device according to one embodiment of the present disclosure. The handheld device may include a smart phone, a smart pad, a wearable device (e.g., a smart watch or smart glasses), or a portable computer (e.g., a notebook, etc.). A handheld device may be referred to as a Mobile Station (MS), a User Terminal (UT), a mobile subscriber station (MSs), a Subscriber Station (SS), an Advanced Mobile Station (AMS), or a Wireless Terminal (WT).

Referring to fig. 19, the handheld device 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a memory unit 130, a power supply unit 140a, an interface unit 140b, and an I/O unit 140c. The antenna unit 108 may be configured as part of the communication unit 110. Blocks 110 through 130/140a through 140c correspond to blocks 110 through 130/140, respectively, of fig. 18.

The communication unit 110 may transmit and receive signals (e.g., data and control signals) to and from other wireless devices or BSs. The control unit 120 may perform various operations by controlling constituent elements of the handheld device 100. The control unit 120 may include an Application Processor (AP). The memory unit 130 may store data/parameters/programs/codes/commands required to drive the handheld device 100. The memory unit 130 may store input/output data/information, etc. The power supply unit 140a may supply power to the handheld device 100 and include wired/wireless charging circuits, batteries, and the like. The interface unit 140b may support connection of the handheld device 100 with other external devices. The interface unit 140b may include various ports (e.g., an audio I/O port and a video I/O port) for connection with external devices. The I/O unit 140c may input or output video information/signals, audio information/signals, data, and/or information input by a user. The I/O unit 140c may include a camera, a microphone, a user input unit, a display unit 140d, a speaker, and/or a haptic module.

As an example, in the case of data communication, the I/O unit 140c may acquire information/signals (e.g., touch, text, voice, image, or video) input by a user, and the acquired information/signals may be stored in the memory unit 130. The communication unit 110 may convert information/signals stored in the memory into radio signals and transmit the converted radio signals directly to other wireless devices or to the BS. The communication unit 110 may receive radio signals from other wireless devices or BSs and then restore the received radio signals to original information/signals. The recovered information/signals may be stored in the memory unit 130 and may be output as various types (e.g., text, voice, image, video, or haptic) through the I/O unit 140 c.

Fig. 20 illustrates a vehicle or autonomous vehicle in accordance with one embodiment of the present disclosure. The vehicle or autonomous vehicle may be implemented by a mobile robot, a car, a train, a person/unmanned Aerial Vehicle (AV), a ship, or the like.

Referring to fig. 20, the vehicle or autonomous vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a driving unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 may be configured as part of the communication unit 110. Blocks 110/130/140a through 140d correspond to blocks 110/130/140, respectively, of FIG. 18.

The communication unit 110 may transmit and receive signals (e.g., data signals and control signals) to and from external devices such as other vehicles, BSs (e.g., gNB and roadside units), and servers. The control unit 120 may perform various operations by controlling elements of the vehicle or the autonomously driven vehicle 100. The control unit 120 may include an Electronic Control Unit (ECU). The driving unit 140a may cause the vehicle or the autonomous driving vehicle 100 to travel on the road. The drive unit 140a may include an engine, motor, transmission, wheels, brakes, steering, etc. The power supply unit 140b may supply power to the vehicle or the autonomous driving vehicle 100, and may include a wired/wireless charging circuit, a battery, and the like. The sensor unit 140c may acquire a vehicle state, external environment information, user information, and the like. The sensor unit 140c may include an Inertial Measurement Unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a gradient sensor, a weight sensor, a heading sensor, a position module, a vehicle forward/backward sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illumination sensor, a pedal position sensor, and the like. The autonomous driving unit 140d may implement a technique for keeping a lane in which the vehicle is traveling, a technique for automatically adjusting a speed (e.g., adaptive cruise control), a technique for autonomously driving along a determined path, a technique for driving by automatically setting a path in the case where a destination is set, and the like.

For example, the communication unit 110 may receive map data, traffic information data, and the like from an external server. The autonomous driving unit 140d may generate an autonomous driving path and a driving plan from the obtained data. The control unit 120 may control the drive unit 140a such that the vehicle or the autonomous driving vehicle 100 may move along the autonomous driving path based on a driving plan (e.g., speed/direction control). In the middle of autonomous driving, the communication unit 110 may aperiodically/periodically acquire the latest traffic information data from an external server and acquire surrounding traffic information data from neighboring vehicles. In between autonomous driving, the sensor unit 140c may acquire vehicle state and/or ambient information. The autonomous driving unit 140d may update the autonomous driving path and the driving plan based on the newly obtained data/information. The communication unit 110 may transmit information about the vehicle location, the autonomous driving path, and/or the driving plan to an external server. The external server may predict traffic information data using AI technology or the like based on information collected from the vehicle or the autonomous driving vehicle, and provide the predicted traffic information data to the vehicle or the autonomous driving vehicle.

The claims in this specification may be combined in various ways. For example, the technical features in the method claims of the present description may be combined to be implemented or performed in a device, and the technical features in the device claims may be combined to be implemented or performed in a method. Furthermore, the technical features in the method claim(s) and the device claim(s) may be combined to be implemented or performed in the device. Furthermore, the technical features in the method claim(s) and the device claim(s) may be combined to be implemented or performed in the method.

Claims

1. A method for a first user equipment, UE, to transmit information related to inter-UE cooperation in a wireless communication system, the method comprising the steps of:

determining information related to inter-UE cooperation based on configuration information, and

Transmitting said information related to said inter-UE cooperation to a second UE,

Wherein the information related to the inter-UE cooperation is based on information representing preferred resources related to scheme 1 or information representing a collision of reserved resources related to scheme 2,

Wherein the preferred resource is determined among resources related to transmission of the second UE,

Wherein said collision of said reserved resources is determined based on an RSRP measured by said first UE,

Wherein said configuration information comprises information for i) a first condition related to a determination of said preferred resource and ii) a second condition related to a determination of said conflict of said reserved resources,

Wherein the preferred resource is determined among the resources related to the transmission of the second UE based on information for the first condition,

Wherein an RSRP threshold associated with the RSRP measured by the first UE is determined based on the information for the second condition.

2. The method of claim 1, wherein resources excluded from the preferred resources are determined among the resources related to the transmission of the second UE based on information for the first condition.

3. The method of claim 2, wherein the resources excluded from the preferred resources are resources belonging to a predefined time slot,

Wherein the predefined time slots include time slots in which SL reception of the first UE is not performed.

4. The method of claim 1, wherein resources included in the preferred resources are determined among the resources related to the transmission of the second UE based on the information for the first condition.

5. The method of claim 1, wherein the determined RSRP threshold is related to one or more RSRP among RSRP measured by the first UE.

6. The method of claim 5, wherein the one or more RSRP comprises an RSRP measured based on a side link demodulation reference signal, SL DMRS, of a predefined UE among the UEs related to the reserved resources.

7. The method of claim 6, wherein the UE associated with the reserved resource is based on a UE transmitting first side link control information SCI indicating the reserved resource to the first UE.

8. The method of claim 1, wherein information representative of the preferred resources associated with the scheme 1 is transmitted based on the information associated with the inter-UE cooperation being associated with a request of the second UE.

9. The method of claim 1, wherein the configuration information is based on pre-configuration information or information received from a base station based on RRC signaling.

10. A first UE that transmits information related to inter-UE cooperation in a wireless communication system, the first UE comprising:

One or more transceivers;

One or more processors that control the one or more transceivers; and

One or more memories operatively connected to the one or more processors,

Wherein the one or more memories store instructions that perform operations based on execution by the one or more processors, and

Wherein the operations include:

11. An apparatus for controlling a first UE to transmit information related to inter-UE cooperation in a wireless communication system, the apparatus comprising:

one or more processors; and

One or more memories operatively connected to the one or more processors,

Wherein the operations include:

12. One or more non-transitory computer-readable media storing one or more instructions, wherein the one or more instructions perform operations based on execution by one or more processors, and

Wherein the operations include:

13. A method for a second user equipment, UE, to receive information related to inter-UE cooperation in a wireless communication system, the method comprising the steps of:

Receiving said information related to said inter-UE cooperation from a first UE,

Wherein the information related to inter-UE cooperation is determined based on configuration information,

14. The method of claim 13, further comprising the step of:

Based on the information indicating the preferred resources related to the scheme 1, a resource for transmission of the physical side link shared channel PSSCH is selected.

15. The method of claim 13, further comprising the step of:

The first side link control information SCI is transmitted,

Wherein the first SCI is associated with reserved resources for transmission of a physical side chain shared channel, PSSCH.

16. The method of claim 15, further comprising the step of:

Based on information representing the collision of the reserved resources related to the scheme 2, resources for the transmission of the PSSCH are reselected.

17. A second UE that receives information related to inter-UE cooperation in a wireless communication system, the second UE comprising:

One or more transceivers;

One or more processors that control the one or more transceivers; and

One or more memories operatively connected to the one or more processors,

Wherein the operations include:

information related to the inter-UE cooperation is received from a first UE,

Wherein information related to inter-UE cooperation is determined based on the configuration information,