CN117480829A - Method and apparatus for selecting NR SL resources by considering LTE SL - Google Patents
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Abstract
A method of operation of a first device (100) in a wireless communication system is presented. The method may comprise the steps of: performing sensing for at least one candidate slot for resource selection; and updating the candidate set of resources based on the sensing result obtained from the LTE SCI, wherein LTE SCI related resources and an integer number of resources having a time and frequency adjacent to the time and frequency of LTE SCI related resources are excluded from the candidate set of resources.
Description
Technical Field
The present disclosure relates to wireless communication systems.
Background
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 increase of data traffic. V2X (vehicle to everything) refers to a communication technology in which vehicles are used to exchange information with other vehicles, pedestrians, objects equipped with 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.
Meanwhile, as a wider range of communication devices requires a larger communication capacity, a demand for mobile broadband communication, which is more enhanced than the existing Radio Access Technology (RAT), is rising. Thus, discussion is made on reliability and delay sensitive services and User Equipment (UE). 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 Radio Access Technologies (RATs) or New Radios (NRs). In this context, NR may also support vehicle-to-everything (V2X) communication.
Fig. 1 is a diagram depicting NR based V2X communications compared to RAT based V2X communications used prior to NR. The embodiment of fig. 1 may be combined with various embodiments of the present disclosure.
Regarding V2X communication, schemes for providing security services based on V2X messages such as Basic Security Messages (BSM), collaboration Awareness Messages (CAM), and de-centralized environment notification messages (denom) focus on discussion on RATs used before NR. The V2X message may include location information, dynamic information, attribute information, and the like. For example, the UE may send a periodic message type CAM and/or an event trigger message type denom to another UE.
Thereafter, regarding V2X communication, various V2X scenes are proposed in NR. For example, various V2X scenarios may include vehicle formation, advanced driving, extension sensors, remote driving, and the like.
Disclosure of Invention
Technical proposal
According to an embodiment of the present disclosure, a method for performing wireless communication by a first device may be presented. For example, the method may include: triggering resource selection; determining a resource selection window associated with the resource selection; determining a set of candidate resources within the resource selection window; performing sensing for at least one candidate slot for the resource selection; and updating the set of candidate resources based on the sensed result, wherein the sensed result is acquired based on Long Term Evolution (LTE) side chain control information (SCI), and wherein updating the set of candidate resources based on the sensed result comprises: and excluding from the candidate resource set an integer number M1 of resources adjacent to the resources associated with the LTE SCI and the frequency of the resources associated with the LTE SCI.
According to an embodiment of the present disclosure, a first device for performing wireless communication may be presented. For example, the first device may include: one or more memories storing instructions; one or more transceivers; and one or more processors coupled to the one or more memories and the one or more transceivers. For example, the one or more processors may execute the instructions to: triggering resource selection; determining a resource selection window associated with the resource selection; determining a set of candidate resources within the resource selection window; performing sensing for at least one candidate slot for the resource selection; and updating the set of candidate resources based on the sensed result, wherein the sensed result is acquired based on Long Term Evolution (LTE) side chain control information (SCI), and wherein updating the set of candidate resources based on the sensed result comprises: and excluding from the candidate resource set an integer number M1 of resources adjacent to the resources associated with the LTE SCI and the frequency of the resources associated with the LTE SCI.
According to an embodiment of the present disclosure, an apparatus adapted to control a first User Equipment (UE) may be presented. For example, the apparatus may comprise: one or more processors; and one or more memories operatively connected to the one or more processors and storing instructions. For example, the one or more processors may execute the instructions to: triggering resource selection; determining a resource selection window associated with the resource selection; determining a set of candidate resources within the resource selection window; performing sensing for at least one candidate slot for the resource selection; and updating the set of candidate resources based on the sensed result, wherein the sensed result is acquired based on Long Term Evolution (LTE) side chain control information (SCI), and wherein updating the set of candidate resources based on the sensed result comprises: and excluding from the candidate resource set an integer number M1 of resources adjacent to the resources associated with the LTE SCI and the frequency of the resources associated with the LTE SCI.
According to an embodiment of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be presented. For example, the instructions, when executed, may cause a first device to: triggering resource selection; determining a resource selection window associated with the resource selection; determining a set of candidate resources within the resource selection window; performing sensing for at least one candidate slot for the resource selection; and updating the set of candidate resources based on the sensed result, wherein the sensed result is acquired based on Long Term Evolution (LTE) side chain control information (SCI), and wherein updating the set of candidate resources based on the sensed result comprises: and excluding from the candidate resource set an integer number M1 of resources adjacent to the resources associated with the LTE SCI and the frequency of the resources associated with the LTE SCI.
According to an embodiment of the present disclosure, a method for performing wireless communication by a second device, the method comprising: receiving New Radio (NR) side link control information (SCI) for scheduling a physical side link shared channel (PSSCH) from a first device over a physical side link control channel (PSCCH) based on Side Link (SL) resources; and receiving a Medium Access Control (MAC) Protocol Data Unit (PDU) from the first device over the PSSCH based on the SL resource, wherein the SL resource is selected within a candidate resource set, wherein the candidate resource set included within a resource selection window determined within a resource pool is updated based on a sensed result, wherein the updating of the candidate resource set based on the sensed result comprises: integer M1 resources adjacent to a Long Term Evolution (LTE) SCI related resource and frequencies of LTE SCI related resources are excluded from the candidate set of resources.
According to an embodiment of the present disclosure, a second device for performing wireless communication may be presented. For example, the second device may include: one or more memories storing instructions; one or more transceivers; and one or more processors coupled to the one or more memories and the one or more transceivers. For example, the one or more processors may execute the instructions to: receiving New Radio (NR) side link control information (SCI) for scheduling a physical side link shared channel (PSSCH) from a first device over a physical side link control channel (PSCCH) based on Side Link (SL) resources; and receiving a Medium Access Control (MAC) Protocol Data Unit (PDU) from the first device over the PSSCH based on the SL resource, wherein the SL resource is selected within a candidate resource set, wherein the candidate resource set included within a resource selection window determined within a resource pool is updated based on a sensed result, wherein the updating of the candidate resource set based on the sensed result comprises: integer M1 resources adjacent to a Long Term Evolution (LTE) SCI related resource and frequencies of LTE SCI related resources are excluded from the candidate set of resources.
Advantageous effects
A User Equipment (UE) can efficiently perform SL communication.
Drawings
Fig. 1 is a diagram for describing NR based V2X communication compared to V2X communication based on RAT used before NR.
Fig. 2 shows a structure of an NR system according to an embodiment of the present disclosure.
Fig. 3 illustrates a radio protocol architecture according to an embodiment of the present disclosure.
Fig. 4 shows a structure of a radio frame of NR according to an embodiment of the present disclosure.
Fig. 5 illustrates a structure of a slot of an NR frame according to an embodiment of the present disclosure.
Fig. 6 illustrates an example of BWP according to an embodiment of the present disclosure.
Fig. 7 illustrates a UE performing V2X or SL communication according to an embodiment of the present disclosure.
Fig. 8 illustrates a process of performing V2X or SL communication by a UE based on a transmission mode according to an embodiment of the present disclosure.
Fig. 9 illustrates three broadcast types according to an embodiment of the present disclosure.
Fig. 10 illustrates an embodiment of determining a candidate set of resources for SL communication based on LTE SCI according to one embodiment of the present disclosure.
Fig. 11 illustrates an embodiment of determining a candidate set of resources for SL communication based on LTE SCI according to one embodiment of the present disclosure.
Fig. 12 illustrates a process for a first device to perform wireless communication according to one embodiment of the present disclosure.
Fig. 13 illustrates a process for a second device to perform wireless communication according to one embodiment of the present disclosure.
Fig. 14 shows a communication system 1 according to an embodiment of the present disclosure.
Fig. 15 illustrates a wireless device in accordance with an embodiment of the present disclosure.
Fig. 16 illustrates a signal processing circuit for transmitting a signal in accordance with an embodiment of the present disclosure.
Fig. 17 illustrates another example of a wireless device in accordance with an embodiment of the present disclosure.
Fig. 18 illustrates a handheld device in accordance with an embodiment of the present disclosure.
Fig. 19 illustrates a vehicle or autonomous vehicle in accordance with an 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 any combination of "a only", "B only", "C only" or "A, B, C".
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 the present disclosure, "at least one of A, B and C" may mean "a only", "B only", "C only", or "A, B and C in any combination. 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 "PDCCH" may be proposed as an example of the "control information". Specifically, when indicated as "control information (i.e., PDCCH)", this may also mean that "PDCCH" is proposed as an example of "control information".
The technical features respectively 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. The 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, technical features according to embodiments of the present disclosure will not be limited thereto.
Fig. 2 shows a structure of an NR system according to an embodiment of the present disclosure. The embodiment of fig. 2 may be combined with various embodiments of the present disclosure.
Referring to fig. 2, a next generation radio access network (NG-RAN) may include a BS20 providing user plane and control plane protocol termination to a UE 10. For example, the BS20 may include a next generation node B (gNB) and/or an evolved node B (eNB). For example, the UE 10 may be fixed or mobile and may be referred to as other terminology such as a Mobile Station (MS), a User Terminal (UT), a Subscriber Station (SS), a Mobile Terminal (MT), a wireless device, etc. For example, a BS may be referred to as a fixed station that communicates with the UEs 10 and may be referred to as other terminology such as a Base Transceiver System (BTS), an Access Point (AP), and the like.
The embodiment of fig. 2 illustrates a case where only the gNB is included. BS20 may be interconnected via an Xn interface. The BS20 may be interconnected via a fifth generation (5G) core network (5 GC) and NG interface. More specifically, the BS20 may be connected to an access and mobility management function (AMF) 30 via an NG-C interface, and may be connected to a User Plane Function (UPF) 30 via an NG-U interface.
The radio interface protocol layers between the UE and the network may be classified into a first layer (L1), a second layer (L2), and a third layer (L3) based on the lower three layers of the Open System Interconnection (OSI) model well known in communication systems. Wherein a Physical (PHY) layer belonging to the first layer provides an information transfer service using a physical channel, and a Radio Resource Control (RRC) layer located at the third layer controls radio resources between the UE and the network. For this, the RRC layer exchanges RRC messages between the UE and the BS layer.
Fig. 3 illustrates a radio protocol architecture in accordance with an embodiment of the present disclosure. The embodiment of fig. 3 may be combined with various embodiments of the present disclosure. Specifically, (a) in fig. 3 shows a radio protocol stack of a user plane for Uu communication, and (b) in fig. 3 shows a radio protocol stack of a control plane for Uu communication. Fig. 3 (c) shows a radio protocol stack of a user plane for SL communication, and fig. 3 (d) shows a radio protocol stack of a control plane for SL communication.
Referring to fig. 3, a physical layer provides an information transfer service to an upper layer through a physical channel. The physical layer is connected to a Medium Access Control (MAC) layer, which is an upper layer of the physical layer, through a transport channel. Data is transferred between the MAC layer and the physical layer through a transfer channel. The transport channels are classified according to how data is transmitted over the radio interface and what characteristics the data is transmitted.
Data is transferred through a physical channel between different physical layers, i.e., a PHY layer of a transmitter and a PHY layer of a receiver. The physical channel may be modulated using an Orthogonal Frequency Division Multiplexing (OFDM) scheme, and uses time and frequency as radio resources.
The MAC layer provides services to a Radio Link Control (RLC) layer, which is a higher layer of the MAC layer, via a logical channel. The MAC layer provides a function of mapping a plurality of logical channels to a plurality of transport channels. The MAC layer also provides a function of logical channel multiplexing by mapping a plurality of logical channels to a single transport channel. The MAC layer provides a data transfer service through a logical channel.
The RLC layer performs concatenation, segmentation and reassembly of radio link control service data units (RLC SDUs). In order to ensure different quality of service (QoS) required for Radio Bearers (RBs), the RLC layer provides three types of operation modes, namely a Transparent Mode (TM), a non-acknowledged mode (UM), and an Acknowledged Mode (AM). AM RLC provides error correction through automatic repeat request (ARQ).
The Radio Resource Control (RRC) layer is defined only in the control plane. The RRC layer serves to control logical channels, transport channels, and physical channels associated with configuration, reconfiguration, and release of RBs. The RB is a logical path for data delivery between the UE and the network provided by the first layer (i.e., physical layer or PHY layer) and the second layer (i.e., MAC layer, RLC layer, packet Data Convergence Protocol (PDCP) layer, and Service Data Adaptation Protocol (SDAP) layer).
The functions of Packet Data Convergence Protocol (PDCP) in the user plane include delivery of user data, header compression, and ciphering. The functions of the Packet Data Convergence Protocol (PDCP) in the control plane include delivery of control plane data and ciphering/integrity protection.
The Service Data Adaptation Protocol (SDAP) layer is defined only in the user plane. The SDAP layer performs a mapping between quality of service (QoS) flows and Data Radio Bearers (DRBs) and QoS Flow ID (QFI) flags in both DL packets and UL packets.
Configuration of the RB means a process for designating a radio protocol layer and channel properties to provide a specific service and for determining corresponding detailed parameters and operation methods. RBs may then be classified into two types, namely, signaling Radio Bearers (SRBs) and Data Radio Bearers (DRBs). The SRB is used as a path for transmitting RRC messages in the control plane, and the DRB is used as a path for transmitting user data in the user plane.
When an RRC connection is established between the RRC layer of the UE and the RRC layer of the E-UTRAN, the UE is in an RRC CONNECTED (rrc_connected) state, otherwise the UE may be in an RRC IDLE (rrc_idle) state. In the case of NR, an RRC INACTIVE (rrc_inactive) state is additionally defined, and a UE in the rrc_inactive state may maintain a connection with the core network and release its connection with the BS.
Downlink transport channels for transmitting (or transmitting) data from a network to a UE include a Broadcast Channel (BCH) for transmitting system information and a downlink Shared Channel (SCH) for transmitting other user traffic or control messages. Traffic or control messages of a downlink multicast or broadcast service may be transmitted via a downlink SCH or may be transmitted via a separate downlink Multicast Channel (MCH). In addition, uplink transport channels for transmitting (or transmitting) data from the UE to the network include a Random Access Channel (RACH) for transmitting an initial control message and an uplink Shared Channel (SCH) for transmitting other user traffic or control messages.
Examples of logical channels belonging to a higher layer of a transport channel and mapped to the transport channel may include a Broadcast Control Channel (BCCH), a Paging Control Channel (PCCH), a Common Control Channel (CCCH), a Multicast Control Channel (MCCH), a Multicast Traffic Channel (MTCH), and the like.
Fig. 4 shows a structure of a radio frame of NR according to an embodiment of the present disclosure. The embodiment of fig. 4 may be combined with various embodiments of the present disclosure.
Referring to fig. 4, 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 according to a subcarrier spacing (SCS). Each slot may include 12 or 14 OFDM (a) symbols according to 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 shown below shows the number of symbols per slot (nslotsmb), the number of slots per frame (Nframe, uslot), and the number of slots per subframe (Nsubframe, uslot) according to the SCS configuration (u) in case of employing the normal CP.
TABLE 1
| SCS(15*2 u ) | N slot symb | N frame,u slot | N subframe,u slot |
| 15KHz(u＝0) | 14 | 10 | 1 |
| 30KHz(u＝1) | 14 | 20 | 2 |
| 60KHz(u＝2) | 14 | 40 | 4 |
| 120KHz(u＝3) | 14 | 80 | 8 |
| 240KHz(u＝4) | 14 | 160 | 16 |
Table 2 shows examples of the number of symbols per slot, the number of slots per frame, and the number of slots per subframe according to SCS in case of using the extended CP.
TABLE 2
| SCS(15*2 u ) | N slot symb | N frame,u slot | N subframe,u slot |
| 60KHz(u＝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 |
Fig. 5 shows a structure of a slot of an NR frame according to an embodiment of the present disclosure. The embodiment of fig. 5 may be combined with various embodiments of the present disclosure.
Referring to fig. 5, 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.
Hereinafter, a bandwidth part (BWP) and a carrier will be described in detail.
BWP may be a contiguous set of Physical Resource Blocks (PRBs) within a given parameter set. The PRBs may be selected from a contiguous set of portions of a Common Resource Block (CRB) for a given set of parameters on a given carrier.
For example, the BWP may be at least any 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) other than 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 (configured by a Physical Broadcast Channel (PBCH)) for a Remaining Minimum System Information (RMSI) control resource set (CORESET). 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. To save power, if the UE cannot detect Downlink Control Information (DCI) during a specified 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 in 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. For example, the UE may receive a configuration for Uu BWP from the BS/network. SL BWP is (pre) configured in the carrier for 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.
Fig. 6 illustrates an example of BWP according to an embodiment of the present disclosure. The embodiment of fig. 6 may be combined with various embodiments of the present disclosure. It is assumed that in the embodiment of fig. 6, the number of BWP is 3.
Referring to fig. 6, 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) with respect to point a, and bandwidth (NsizeBWP). For example, point a may be an external reference point of the PRBs of the carrier, with subcarrier 0 of all parameter sets (e.g., all parameter sets supported by the network on the corresponding carrier) aligned in point a. For example, the offset may be the PRB distance between the lowest subcarrier within a given parameter set and point a. For example, the bandwidth may be the number of PRBs within a given parameter set.
Hereinafter, V2X or SL communication will be described.
The Side Link Synchronization Signal (SLSS) may include a primary side link synchronization signal (PSSS) and a secondary side link synchronization signal (SSSS) as SL specific sequences. 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 synchronization acquisition. For example, the UE may use the S-PSS and S-SSS for acquisition of detailed synchronization and 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 Cyclic Redundancy Check (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 (SB). 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.
Fig. 7 illustrates a UE performing V2X or SL communication according to an embodiment of the present disclosure. The embodiment of fig. 7 may be combined with various embodiments of the present disclosure.
Referring to fig. 7, in V2X or SL communications, the term "UE" may generally refer to a user's UE. However, if a network device such as a BS transmits/receives signals according to a communication scheme between UEs, the BS may also be regarded as a kind of UE. 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 meaning a set of resource series. In addition, UE 1 may transmit the SL signal by using the resource unit. For example, a resource pool in which UE 1 can transmit a signal may be configured to UE 2 as a receiving UE, and the signal of UE 1 may be detected in the resource pool.
Herein, if UE1 is within the connection range of the BS, the BS may inform the UE1 of the resource pool. Otherwise, if UE1 is out of the connection range of the BS, another UE may inform UE1 of the resource pool, or UE1 may use a preconfigured resource pool.
In general, a resource pool may be configured in units of a plurality of resources, and each UE may select a unit of one or more resources to use in its SL signaling.
Hereinafter, resource allocation in SL will be described.
Fig. 8 illustrates a process of performing V2X or SL communication by a UE based on a transmission mode according to an embodiment of the present disclosure. The embodiment of fig. 8 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, in LTE, a transmission mode may be referred to as an LTE transmission mode. In NR, the transmission mode may be referred to as an NR resource allocation mode.
For example, (a) in fig. 8 shows UE operation related to LTE transmission mode 1 or LTE transmission mode 3. Alternatively, for example, (a) in fig. 8 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. 8 shows UE operation related to LTE transmission mode 2 or LTE transmission mode 4. Alternatively, for example, (b) in fig. 8 shows UE operation in relation to NR resource allocation pattern 2.
Referring to (a) in fig. 8, in LTE transmission mode 1, LTE transmission mode 3, or NR resource allocation mode 1, the BS may schedule SL resources to be used by the UE for SL transmission. For example, the BS may perform resource scheduling on UE 1 through PDCCH (e.g., downlink Control Information (DCI)) or RRC signaling (e.g., configuration grant type 1 or configuration grant type 2), and UE 1 may perform V2X or SL communication for UE 2 according to the resource scheduling. For example, UE 1 may transmit side link control information (SCI) to UE 2 over a physical side link control channel (PSCCH), and thereafter transmit SCI-based data to UE 2 over a physical side link shared channel (PSSCH).
Referring to (b) of fig. 8, 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 BS/network or preconfigured 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 in the configured resource pool. For example, the UE may autonomously select resources within the selection window by performing sensing and resource (re) selection procedures. For example, sensing may be performed in units of subchannels. In addition, UE 1, which has autonomously selected resources in the resource pool, may transmit SCI to UE 2 through the PSCCH, and thereafter, SCI-based data may be transmitted to UE 2 through the PSSCH.
For example, the UE may assist in SL resource selection for other UEs. For example, in NR resource allocation mode 2, the UE may receive a grant of configuration for SL transmission. For example, in NR resource allocation mode 2, a UE may schedule SL transmissions for other UEs. For example, in NR resource allocation mode 2, the UE may reserve SL resources for blind retransmission.
For example, in NR resource allocation mode 2, the first UE may use SCI to indicate the priority of SL transmissions to the second UE. For example, the second UE may decode the SCI and the second UE may perform sensing and/or resource (re) selection based on the priority. For example, the resource (re) selection procedure may include: the second UE identifies candidate resources within a resource selection window, and the second UE selects resources for (re) transmission from among the identified candidate resources. For example, the resource selection window may be a time interval during which the UE selects resources for SL transmission. For example, after the second UE triggers a resource (re) selection, the resource selection window may start when T1 Σ 0, and the resource selection window may be limited by the remaining packet delay budget of the second UE. For example, in the step of the second UE identifying the candidate resource within the resource selection window, if a specific resource is indicated by the SCI received by the second UE from the first UE and the L1 SL RSRP measured value for the specific resource exceeds the SL RSRP threshold, the second UE may not determine the specific resource as the candidate resource. For example, the SL RSRP threshold may be determined based on the priority of SL transmissions indicated by the SCI received by the second UE from the first UE and the priority of SL transmissions on the resources selected by the second UE.
For example, L1 SL RSRP may be measured based on SL demodulation reference signals (DMRS). For example, one or more PSSCH DMRS patterns may be set or preset for each resource pool in the time domain. For example, PDSCH DMRS configuration type 1 and/or type 2 may be the same as or similar to the frequency domain pattern of PSSCH DMRS. For example, the exact DMRS pattern may be indicated by SCI. For example, in NR resource allocation mode 2, the transmitting UE may select a specific DMRS pattern from the configured or preconfigured DMRS patterns for the resource pool.
For example, in NR resource allocation mode 2, based on the sensing and resource (re) selection procedure, the transmitting UE may perform initial transmission of a Transport Block (TB) without reservation. For example, based on the sensing and resource (re) selection procedures, the transmitting UE may reserve SL resources for initial transmission of the second TB using SCI associated with the first TB.
For example, in NR resource allocation mode 2, the UE may reserve resources for feedback-based PSSCH retransmissions through signaling related to previous transmissions in the same Transport Block (TB). For example, the maximum number of SL resources reserved by a single transmission, including the current transmission, may be two, three, or four. For example, the maximum number of SL resources may be the same whether HARQ feedback is enabled or not. For example, the maximum number of HARQ (re) transmissions for one TB may be limited by configuration or pre-configuration. For example, the maximum number of HARQ (re) transmissions for a TB may be a maximum of 32. For example, the maximum number of HARQ (re) transmissions may not be specified without configuration or pre-configuration. For example, configuration or pre-configuration may be used to transmit the UE. For example, in NR resource allocation mode 2, HARQ feedback may be supported to release resources not used by the UE.
For example, in NR resource allocation mode 2, a UE may use SCI to indicate to another UE one or more subchannels and/or time slots used by the UE. For example, the UE may use the SCI to indicate to another UE one or more sub-channels and/or slots reserved by the UE for PSSCH (re-) transmissions. For example, the minimum allocation unit of SL resources may be a slot. For example, the size of the sub-channel for the UE may be configured or preconfigured.
Hereinafter, side link control information (SCI) will be described.
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 send two consecutive SCIs (e.g., 2-stage SCIs) to the receiving UE on the PSCCH and/or PSSCH. The receiving UE may decode two consecutive SCIs (e.g., 2-stage 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 a first SCI or 1 st SCI, and SCI comprising a second SCI configuration field set may be referred to as a second SCI or 2 nd 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 over a PSSCHIs sent in a piggybacked manner with the data. For example, two consecutive SCIs may also be applied to different transmissions (e.g., unicast, broadcast, or multicast).
For example, the transmitting UE may transmit all or part of the information described below to the receiving UE through the SCI. Herein, for example, the transmitting UE may transmit all or part of the information described below to the receiving UE through the first SCI and/or the second SCI.
Resource allocation information related to the PSSCH and/or PSCCH, e.g., number/location of time/frequency resources, resource reservation information (e.g., period), and/or
-SL CSI report request indicator or SL (L1) RSRP (and/or SL (L1) RSRQ and/or SL (L1) RSSI) report request indicator, and/or
SL CSI transmission indicator (or SL (L1) RSRP (and/or SL (L1) RSRQ and/or SL (L1) RSSI) information transmission indicator)) over PSSCH), and/or
-MCS information, and/or
-transmit power information, and/or
-L1 destination ID information and/or L1 source ID information, and/or
-SL HARQ process ID information, and/or
-New Data Indicator (NDI) information, and/or
Redundancy Version (RV) information, and/or
QoS information (related to transport traffic/packets), e.g. priority information, and/or
-SL CSI-RS transmission indicator or information about the number of SL CSI-RS antenna ports (to be transmitted), and/or
-transmitting location information of the UE or location (or distance zone) information of the target receiving UE (for which SL HARQ feedback is requested), and/or
Reference signals (e.g. DMRS, etc.) related to channel estimation and/or decoding of data to be transmitted through the PSSCH, e.g. information related to pattern of (time-frequency) mapping resources of DMRS, rank information, antenna port index information
For example, the first SCI may include information related to channel sensing. For example, the receiving UE may decode the second SCI by using PSSCH DMRS. The polarity code used in the PDCCH may be applied to the second SCI. For example, in the resource pool, the payload size of the first SCI may be the same for unicast, multicast and broadcast. After decoding the first SCI, the receiving UE does not have to perform blind decoding of the second SCI. For example, the first SCI may include scheduling information for the second SCI.
Meanwhile, in various embodiments of the present disclosure, since the transmitting UE may transmit at least one of the SCI, the first SCI, and/or the second SCI to the receiving UE through the PSCCH, the PSCCH may be replaced/substituted by at least one of the SCI, the first SCI, and/or the second SCI. Additionally/alternatively, the SCI may be replaced/substituted by at least one of the PSCCH, the first SCI, and/or the second SCI, for example. Additionally/alternatively, the PSSCH may be replaced/substituted by the second SCI, e.g., because the transmitting UE may transmit the second SCI to the receiving UE via the PSSCH.
Fig. 9 illustrates three broadcast types according to an embodiment of the present disclosure. The embodiment of fig. 9 may be combined with various embodiments of the present disclosure. Specifically, (a) of fig. 9 shows broadcast type SL communication, (b) of fig. 9 shows unicast type SL communication, and (c) of fig. 9 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 transmissions, 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.
For example, in the present disclosure, an available resource (and/or a set of available resources) may mean a set of candidate resources. For example, the candidate resource set may mean a candidate resource set reported to the MAC layer by the physical layer of the UE for the MAC layer to perform transmission resource selection.
On the other hand, in future systems, UEs may be allowed to perform Side Link (SL) channel/signal transmission and/or reception operations on a single carrier or cell based on different Radio Access Technologies (RATs), e.g., long Term Evolution (LTE) and/or New Radio (NR). In one embodiment of the present disclosure, the above features may be extended to the case where the UE performs multiple different RAT-based SL transmit and/or receive operations simultaneously on a single RF device and/or baseband (BB) device.
On the other hand, the waveforms and/or signal generation schemes and/or Direct Current (DC) locations and/or subcarrier spacing (SCS) and/or subcarrier offset and/or CP length etc. for SL transmission and reception or for transmission and reception of PSCCH and/or PSSCH may be different, for example, depending on the RAT. More specifically, for example, for LTE SL, an OFDM scheme using SC-FDMA or DFT precoding, SCs is 15kHz, dc position has a subcarrier offset of 7.5kHz from the center of the system bandwidth, and normal and extended CPs may be allowed for CP length. On the other hand, for example, for using NR SL, OFDM or CP-OFDM schemes, SCS can be 15kHz, 30kHz, 60kHz, 120kHz, etc., according to a (pre) configuration, DC positions may be positions of specific subcarriers within the SL BWP or RB grid or specific positions outside the SL BWP or RB grid according to a (pre) configuration, +7.5kHz, 0kHz, -7.5kHz are allowed for subcarrier offset according to a (pre) configuration, and normal CP is supported for CP length, and extended CP is only supported if SCS is 60 kHz. In addition, for example, in LTE SL, SL operation is possible in all SYMBOLs in a subframe or slot, but in NR SL, SL operation is possible only for a SYMBOL duration from a starting SL SYMBOL index (hereinafter referred to as sl_symbol_start) configured in a (pre) configuration to the number of SL SYMBOLs (hereinafter referred to as sl_symbol_length) within a slot.
In another aspect, when performing transmission and/or reception operations of SL channels/signals based on different RATs on a single carrier or cell, the UE may need to avoid resources occupied by LTE SL operations when attempting to perform NR SL operations. That is, the UE may consider the resources reserved by LTE SL operation and select NR SL transmission resources by avoiding the resources under certain conditions (e.g., when the RSRP measurement is higher than the RSRP threshold). For example, both the configuration for LTE SL operation (resource pool configuration, information for carriers, and/or RB grid information) and the configuration for NR SL operation (resource pool configuration, SL BWP configuration, information for carriers, RB grid information, and/or DC information) may be provided to the UE by (pre) configuration or from the base station. This is for example to enable the UE to perform resource (re) selection based on LTE SCI and/or LTE DCI and/or NR SCI and/or NR DCI.
For example, when performing transmission and/or reception operations of SL channels/signals based on different RATs on a single carrier or cell, the UE may expect the resource pool for LTE SL and the resource pool for NR SL or SL BWP not to overlap each other in the frequency domain and/or the time axis. For example, the UE may expect a frequency side spacing associated with the resource pool for LTE SL and a frequency side spacing associated with the resource pool for NR SL or SL BWP to be above a certain level (e.g., above a certain number of RBs or above a certain number of subcarriers based on LTE SL or NR SL). That is, the UE may expect the LTE SL operation and the NR SL operation on the carrier to be time division multiplexed (TDMed) or frequency division multiplexed (FDMed) with each other.
On the other hand, if the resource pools for LTE SL operation and NR SL operation overlap, it is necessary to define how the mutual resource exclusion procedure will be performed during the resource selection of the UE. In particular, if SCS is different and/or subcarrier offset is different between LTE SL and NR SL, resource Block (RB) boundaries between them may not be aligned and there may be significant interference between adjacent RBs. More specifically, for example, in the above case, in an RB grid having a relatively small SCS, high interference may occur in the form of encroachment even when frequency side positions of main and/or side lobes of the waveform are adjacent without overlap.
For example, when performing different RAT-based transmission and/or reception operations of SL channels/signals on a single carrier or cell, the UE may expect that RB boundaries of LTE SL and NR SL will be the same. For example, the SCS of LTE SL and NR SL in the carrier may be the same. For example, the subcarrier offsets of LTE SL and NR SL in the carrier may be the same. For example, the DC positions of LTE SL and NR SL in the carrier may be the same. For example, in a carrier, the boundaries of the sub-channels of LTE SL and NR SL may be aligned.
In this case, according to one embodiment of the present disclosure, the UE performing the NR SL operation may perform a process of receiving the LTE SL control information and excluding candidate resources overlapping with reserved resources derived based on the LTE SL control information within a resource selection window of the NR SL from the available resources. For example, a UE performing an NR SL operation may receive LTE SL control information and perform a procedure of excluding all candidate resources overlapping reserved resources derived based on the LTE SL control information in an NR SL slot from available resources. For example, the resource exclusion procedure may be limited to be performed when the RSRP value measured by the UE based on the LTE SL channel is greater than or equal to a (pre) configured threshold. Alternatively, for example, LTE SL reserved resources may always be avoided when NR SL resources are selected, regardless of RSRP measurements. For example, the RSRP threshold may be configured to be different from the RSRP threshold for NR SL reception. For example, the UE performing LTE SL operation may perform a procedure of receiving NR SL control information and excluding candidate resources overlapping with reserved resources derived from the NR SL control information within a resource selection window of the LTE SL from available resources. For example, the resource exclusion procedure may be limited to be performed when the RSRP value measured by the UE based on the LTE SL channel is greater than or equal to a (pre) configured threshold. For example, the RSRP threshold may be configured to be different from the RSRP threshold used for LTE SL reception.
On the other hand, if LTE SL and NR SL have different SCS and/or subcarrier offset and/or DC positions, it is necessary to create up/down and/or front/back guard areas in addition to reserving the area where the resources overlap. According to one embodiment of the present disclosure, a UE performing an NR SL operation may perform a process of receiving LTE SL control information and excluding candidate resources overlapping with reserved resources derived from the LTE SL control information within a resource selection window of the NR SL from available resources, and further excluding candidate resources adjacent to the excluded candidate resources on a frequency side and/or a time axis from the available resources.
For example, for the NR SL candidate resource overlapping with the LTE SL reserved resource having the different SCS as described above, the UE may generate a bin from the center of each subcarrier through the LTE SL SCS for LTE SL, and generate a bin from the center of each subcarrier through the NR SL SCS for NR SL, and determine whether there is an overlap from the viewpoint of a bin.
Fig. 10 illustrates an embodiment of determining a candidate set of resources for SL communication based on LTE SCI according to one embodiment of the present disclosure. The embodiment of fig. 10 may be combined with various embodiments of the present disclosure.
Referring to fig. 10 (a), subcarriers used in NR communication are shown. In the present embodiment, the subcarrier related to the candidate resource to be used in the NR communication may be f a3 ，f a1 And f a2 Can be respectively f a3 Opposite ends of the RB of the subcarrier. Here, SCS used in NR communication may be f a2 -f a1 . Here, for example, according to an embodiment of the present disclosure, f a4 ～f a5 Can be generated by NR SL SCS in f a3 A bin (hereinafter referred to as NR bin) that is the center.
Referring to fig. 10 (b), subcarriers used in LTE communication are shown. In the present embodiment, the subcarrier related to the candidate resource to be used in LTE communication may be f b3 ，f b1 And f b2 Can be the use of f b3 Opposite ends of the RB of the subcarrier. Here, SCS used in LTE communication may be f b2 -f b1 . Here, for example, according to an embodiment of the present disclosure, f b4 ～f b5 May be generated by LTE SL SCS at f b3 A centered bin (hereinafter referred to as LTE bin).
Referring to fig. 10 (c), it is shown that it is an NR RB (t 1 、t 2 、f a1 、f a2 ) And LTE RB (t) identified based on LTE SCI 1 、t 2 、f b1 、f b2 ). If the embodiments of the present disclosure are not applied, the two RBs do not overlap with each other, and thus the UE performing NR communication may not exclude NR RBs from the candidate set of resources.
Referring to (d) of fig. 10, a region where two bins overlap when NR bins and LTE bins according to an embodiment of the present disclosure are applied is shown. According to the present disclosure, when an NR bin related to a candidate resource overlaps with an LTE RB identified based on an LTE SCI, a transmitting UE performing NR communication may determine that the candidate resource overlaps with the LTE RB identified based on the LTE SCI and exclude the candidate resource from a candidate resource set. Thus, in the case of the present embodiment, since there is an overlap region when NR bin and LTE bin are applied, the transmitting UE may exclude NR RBs from the candidate resource set.
According to embodiments of the present disclosure, when a UE excludes overlapping (overlapping) resources from a set of candidate resources, it may exclude N neighboring candidate resources from candidates to be excluded from available resources for each frequency and/or time direction. For example, the N value may be a (pre) configured value. For example, the value of N may be different for each direction. For example, the N value may be a differently configured value for each SCS and/or each subcarrier offset and/or the size of each subchannel of the NR SL. For example, when the NR SL UE excludes candidates corresponding to r_x, y from available resources based on LTE SL reserved resources, the UE may additionally exclude r_x-N, y, r_x- (N-1), y, r_x-1, y from available resources, and/or may additionally exclude r_x+1, y, r_x+2, y, r_x+m, y from available resources. For example, in the above case, N and M may be the same value, or may be configured to be different values from each other.
Fig. 11 illustrates an embodiment of determining a candidate set of resources for SL communication based on LTE SCI according to one embodiment of the present disclosure. The embodiment of fig. 11 may be combined with various embodiments of the present disclosure.
Referring to fig. 11, a candidate resource set for reporting to a higher layer (e.g., MAC) by a transmitting UE performing NR communication is shown. For example, in the center colored (color) RB (t 1 ，f 1 ) (hereinafter referred to as overlapping RBs) may represent resources overlapping with resources identified based on the LTE SCI.
Further, for example, scratched-out (cross-out) RBs may each represent resources (hereinafter referred to as adjacent resources) adjacent in time and frequency centered around overlapping RBs. For example, adjacent resources may include N temporally preceding overlapping RBs 1 Resource (t) 1 -N 1 ) N after overlapping RBs by time 2 Resource (t) 1 +N 2 ). For example, adjacent resources may include slavesWith a frequency lower than the overlapping RBs by M 1 Resource (f) 1 -M 1 ) To have a frequency M higher than the overlapping RBs 2 Resource (f) 1 +M 2 ). For example, N 1 And N 2 May be the same or different from each other and may be configured for each SCS and/or subcarrier offset. In addition, e.g. M 1 And M 2 May be the same or different from each other and may be configured for each SCS and/or subcarrier offset.
For example, the transmitting UE may exclude resources adjacent in time and/or frequency to the overlapping resources from the candidate set of resources. That is, in the embodiment of fig. 11, the transmitting UE may exclude overlapping RBs and also neighboring resources from the candidate set of resources.
On the other hand, an exchange of information between the LTE SL modem and the NR SL modem may be required so that the SL reserved resource information will be acquired and used at the UE side, and in this case, a definition or a time line for the sensing window needs to be changed. According to one embodiment of the present disclosure, when NR SL resources are selected, the sensing window for the UE may be configured differently for acquiring NR SL reserved resources and for acquiring LTE SL reserved resources. For example, assuming that the NR SL resource selection operation is triggered in the slot N, the end time point of the sensing window for acquiring the LTE SL reserved resource may be the sum of t_proc,0 and X values from the slot N. For example, t_proc,0 may be the time taken to obtain the sensing result, and may be 1, 2, 4 slots for each of SCS15kHz, 30kHz, 60kHz, 120 kHz. For example, the X value is a time taken for exchanging information between the LTE SL modem and the NR SL modem at the UE side, and may be a value determined by the UE capability. For example, the starting point in time of the sensing window for acquiring LTE SL reserved resources may be 1 second before slot N. For example, the LTE SL reserved resources may be derived by the UE applying information obtained from the LTE SL SCI for the LTE SL resource pool and/or the LTE SL available resources.
On the other hand, the LTE SL operation and the NR SL operation may not be performed simultaneously at a single UE side, and in this case, a point of time of LTE SL transmission and/or reception may need to be considered when selecting resources for NR SL transmission of the UE. According to one embodiment of the present disclosure, the UE may perform the resource selection procedure by excluding from the available resources candidate resources that overlap in NR SL slots with the point in time at which LTE SL transmissions are scheduled and/or the point in time at which LTE SL reception is scheduled. For example, in the above, the information considering the point in time for LTE SL transmission and reception may be limited to the case where sufficient processing time is available after the UE detects the LTE SCI. For example, the above-described exclusion method may be applied only when the priority for LTE SL and the priority for NR SL transmission are directly compared at the UE end, as a result of which the priority for LTE SL is higher.
On the other hand, when performing the sensing action, the UE may also fail to perform LTE SL reception or NR SL reception. According to one embodiment of the present disclosure, when the UE performs NR SL resource selection and fails to perform a reception operation for the LTE SCI in the sensing window, the UE may derive LTE SL reserved resources based on all or part of the reserved resource period value on the LTE SL basis and further exclude candidate resources overlapping with the NR SL and/or additional neighboring candidate resources from available resources.
For example, the resource reservation period candidate value for deriving LTE SL reserved resources, which is assumed when NR SL candidate resources are excluded due to no LTE SCI being detected, may be (pre) configured to the UE. For example, if the amount of available resources in the NR SL resource selection window relative to the total resources due to the exclusion of NR SL candidate resources (due to LTE SCI undetected) is less than or equal to a (pre) configured threshold, the UE may cancel the resource exclusion due to LTE SCI undetected. For example, if the amount of available resources in the NR SL resource selection window relative to the total resources due to the exclusion of NR SL candidate resources (due to the undetected LTE SCI) is less than or equal to a (pre) configured threshold, the UE may change the ratio of available resources from "the amount of resources after excluding the undetected NR SL candidate resources of the LTE SCI from the total resources in the NR SL resource selection window" to "the amount of available resources" and perform the resource selection procedure.
Although the embodiments of the present disclosure describe a method of considering LTE SL reserved resources when selecting NR SL resources, the concepts of the present disclosure may be extended and applied to consider NR SL reserved resources when selecting LTE SL resources, and vice versa.
Although embodiments of the present disclosure describe methods for simultaneous operation of LTE SL and NR SL on the same carrier, the concepts of the present disclosure may be extended and applied to other RAT-based SL or V2X and NR SL simultaneous operation environments, or to environments where NR SL uses different transmission parameters (e.g., SCS and/or subcarrier offset and/or DC position, etc.).
In embodiments of the present disclosure, for NR SL operations, the resource selection process may include a resource reselection and/or preemption operation. Alternatively, for example, different methods may be selected and operated for resource selection, resource reselection, and preemption in the above-described embodiments.
The method set forth above may be applied to the apparatus described below. First, the processor 202 of the receiving UE may establish at least one BWP. And, the processor 202 of the receiving UE may control the transceiver 206 of the receiving UE to receive the SL-related physical channel and/or the SL-related reference signal from the transmitting UE on at least one BWP.
According to the prior art, SCS and/or subcarrier offsets of different RATs are not considered in the resource selection procedure. According to embodiments of the present disclosure, SCS and/or subcarrier offsets of different RATs may be considered in the resource selection process, thereby enabling inter-RAT communications while reducing collisions that may occur in inter-RAT communications.
Fig. 12 illustrates a process for a first device to perform wireless communication according to one 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 S1210, a first device may trigger resource selection. In step S1220, the first device may determine a resource selection window related to resource selection. In step S1230, the first device may determine a candidate resource set within the resource selection window. In step S1240, the first device may perform sensing for at least one candidate slot for resource selection. In step S1250, the first device may update the candidate resource set based on the sensed result. For example, the result of the sensing may be obtained based on Long Term Evolution (LTE) side chain control information (SCI), and the updating of the candidate resource set based on the result of the sensing may include: integer M1 resources adjacent to the resources associated with the LTE SCI and the frequency of the resources associated with the LTE SCI are excluded from the candidate set of resources.
For example, resource selection may be related to New Radio (NR) Side Link (SL) communication.
For example, additionally, the first device may acquire an LTE SL subcarrier spacing (SCS) based on the LTE SCI; and acquires an NR SL SCS associated with the NR SL communication. For example, the updating of the candidate resource set based on the result of sensing may be performed based on whether LTE SL SCS and NR SL SCS are different.
For example, additionally, the first device may acquire an LTE SL subcarrier offset based on the LTE SCI; and acquires NR SL subcarriers related to NR SL communication. For example, updating of the candidate resource set based on the result of sensing may be performed based on whether the LTE SL subcarrier offset and the NR SL subcarrier offset are different.
For example, additionally, the first device may acquire an LTE SL Direct Current (DC) location based on the LTE SCI; and an NR SL DC location associated with the NR SL communication is acquired. For example, updating of the candidate resource set based on the result of sensing may be performed based on the LTE SL DC location and the NR SL DC location being different.
For example, additionally, the first device may acquire LTE SL SCS based on LTE SCI; acquiring an NR SL SCS based on NR SL communication; generating an LTE SL bin based on the LTE SL SCS; generating NR SL bin based on NR SL SCS; and determining resources associated with the LTE SCI based on the LTE SL bin and the NR SL bin. For example, based on the LTE SL bin overlapping with the NR SL bin, the resources related to the LTE SL bin may be determined as the resources related to the LTE SCI.
For example, N2 may be configured for each SCS associated with NR SL communication.
For example, the updating of the candidate resource set based on the sensed result may include: the time for the integer N1 resources adjacent to the LTE SCI related resources and the LTE SCI related resources is excluded from the candidate set of resources, the N1 resources include the integer N2 resources before the LTE SCI related resources and the integer N3 resources after the LTE SCI related resources, and N1 may be the sum of N2 and N3.
For example, N2 and N3 may be different.
For example, the M1 resources may include an integer M2 resources having a frequency higher than that of the LTE SCI-related resources and an integer M3 resources having a frequency lower than that of the LTE SCI-related resources, and M1 may be a sum of M2 and M3.
For example, M2 and M3 may be different.
For example, the updating of the candidate set of resources based on the sensing result may be performed based on a Reference Signal Received Power (RSRP) value measured according to the LTE SCI being greater than or equal to a first RSRP threshold.
For example, the first RSRP threshold may be different from the second RSRP threshold used in NR SL communications.
The above-described embodiments can be applied to various devices described below. For example, the processor 102 of the first device 100 may trigger the resource selection. Also, the processor 102 of the first device 100 may determine a resource selection window related to resource selection. Also, the processor 102 of the first device 100 may determine a set of candidate resources within the resource selection window. Also, the processor 102 of the first device 100 may perform sensing for at least one candidate slot for resource selection. And, the processor 102 of the first device 100 may update the candidate resource set based on the sensed result. For example, the result of the sensing may be obtained based on Long Term Evolution (LTE) side chain control information (SCI), and the updating of the candidate resource set based on the result of the sensing may include: integer M1 resources adjacent to the resources associated with the LTE SCI and the frequency of the resources associated with the LTE SCI are excluded from the candidate set of resources.
According to an embodiment of the present disclosure, a first device for performing wireless communication may be presented. For example, the first device may include: one or more memories storing instructions; one or more transceivers; and one or more processors coupled to the one or more memories and the one or more transceivers. For example, one or more processors may execute instructions to: triggering resource selection; determining a resource selection window associated with the resource selection; determining a set of candidate resources within a resource selection window; performing sensing for at least one candidate slot for resource selection; and updating the candidate resource set based on the sensed result, wherein the sensed result may be acquired based on Long Term Evolution (LTE) side chain control information (SCI), and wherein the updating of the candidate resource set based on the sensed result may include: integer M1 resources adjacent to the resources associated with the LTE SCI and the frequency of the resources associated with the LTE SCI are excluded from the candidate set of resources.
For example, resource selection may be related to New Radio (NR) Side Link (SL) communication.
For example, additionally, the first device may acquire an LTE SL subcarrier spacing (SCS) based on the LTE SCI; and acquires an NR SL SCS associated with the NR SL communication. For example, the updating of the candidate resource set based on the result of sensing may be performed based on whether LTE SL SCS and NR SL SCS are different.
For example, additionally, the first device may acquire an LTE SL subcarrier offset based on the LTE SCI; and acquiring NR SL sub-carriers related to NR SL communication. For example, updating of the candidate resource set based on the result of sensing may be performed based on whether the LTE SL subcarrier offset and the NR SL subcarrier offset are different.
For example, additionally, the first device may acquire an LTE SL Direct Current (DC) location based on the LTE SCI; and an NR SL DC location associated with the NR SL communication is acquired. For example, updating of the candidate resource set based on the result of the sensing may be performed based on the LTE SL DC location and the NR SL DC location being different.
For example, additionally, the first device may acquire LTE SL SCS based on LTE SCI; acquiring an NR SL SCS based on NR SL communication; generating an LTE SL bin based on the LTE SL SCS; generating NR SL bin based on NR SL SCS; and determining resources associated with the LTE SCI based on the LTE SL bin and the NR SL bin. For example, based on the LTE SL bin and the NR SL bin overlapping, the LTE SL bin related resources may be determined as LTE SCI related resources.
For example, N2 may be configured for each SCS associated with NR SL communication.
For example, the updating of the candidate resource set based on the sensed result may include: the time for the integer N1 resources adjacent to the LTE SCI related resources and the LTE SCI related resources is excluded from the candidate set of resources, the N1 resources include the integer N2 resources before the LTE SCI related resources and the integer N3 resources after the LTE SCI related resources, and N1 may be the sum of N2 and N3.
For example, N2 and N3 may be different.
For example, the M1 resources may include an integer M2 resources having a frequency higher than that of the resources related to the LTE SCI and an integer M3 resources having a frequency lower than that of the resources related to the LTE SCI, and M1 may be a sum of M2 and M3.
For example, M2 and M3 may be different.
For example, the updating of the candidate resource set based on the result of the sensing may be performed based on a Reference Signal Received Power (RSRP) value measured according to the LTE SCI being greater than or equal to a first RSRP threshold.
For example, the first RSRP threshold may be different from the second RSRP threshold used in NR SL communications.
According to an embodiment of the present disclosure, an apparatus adapted to control a first User Equipment (UE) may be presented. For example, the apparatus may include: one or more processors; and one or more memories operatively connected to the one or more processors and storing instructions. For example, one or more processors may execute instructions to: triggering resource selection; determining a resource selection window associated with the resource selection; determining a candidate resource set in a resource selection window; performing sensing for at least one candidate slot for resource selection; and updating the candidate resource set based on the sensed result, wherein the sensed result may be acquired based on Long Term Evolution (LTE) side chain control information (SCI), and wherein the updating of the candidate resource set based on the sensed result may include: integer M1 resources adjacent to the resources associated with the LTE SCI and the frequency of the resources associated with the LTE SCI are excluded from the candidate set of resources.
According to an embodiment of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be presented. For example, the instructions, when executed, may cause the first device to: triggering resource selection; determining a resource selection window associated with the resource selection; determining a candidate resource set in a resource selection window; performing sensing for at least one candidate slot for resource selection; to update the candidate resource set based on the sensed result, wherein the sensed result may be acquired based on Long Term Evolution (LTE) side chain control information (SCI), and wherein the updating of the candidate resource set based on the sensed result may include: integer M1 resources adjacent to the resources associated with the LTE SCI and the frequency of the resources associated with the LTE SCI are excluded from the candidate set of resources.
Fig. 13 illustrates a process for a second device to perform wireless communication according to one embodiment of the present disclosure. The embodiment of fig. 13 may be combined with various embodiments of the present disclosure.
Referring to fig. 13, in step S1310, the second device may receive New Radio (NR) side chain control information (SCI) for scheduling a physical side link shared channel (PSSCH) from the first device over a physical side link control channel (PSCCH) based on Side Link (SL) resources. In step S1320, the second device may receive a Medium Access Control (MAC) Protocol Data Unit (PDU) from the first device through the PSSCH based on the SL resource. For example, SL resources may be selected within the candidate resource set, the candidate resource set included within the resource selection window determined within the resource pool may be updated based on the sensed result, and the updating of the candidate resource set based on the sensed result may include: integer M1 resources adjacent to a resource associated with a Long Term Evolution (LTE) SCI and frequencies of the resources associated with the LTE SCI are excluded from the candidate set of resources.
For example, the LTE SL related resources may be determined based on LTE SL bins and NR SL bins, LTE SL bins may be generated based on LTE SL subcarrier spacing (SCS), NR SL bins may be generated based on NR SL SCS, and the LTE SL bin related resources may be determined as LTE SCI related resources based on LTE SL bins and NR SL bins overlapping.
The embodiments described above can be applied to various devices described below. For example, the processor 202 of the second device 200 may control the transceiver 206 to receive New Radio (NR) side chain control information (SCI) for scheduling a physical side chain shared channel (PSSCH) from the first device 100 over a physical side chain control channel (PSCCH) based on side chain (SL) resources. And, the processor 202 of the second device 200 may receive a Medium Access Control (MAC) Protocol Data Unit (PDU) from the first device 100 through the PSSCH based on the SL resource control transceiver 206. For example, SL resources may be selected within the candidate resource set, the candidate resource set included within the resource selection window determined within the resource pool may be updated based on the sensed result, and the updating of the candidate resource set based on the sensed result may include: integer M1 resources adjacent to a resource associated with a Long Term Evolution (LTE) SCI and frequencies of the resources associated with the LTE SCI are excluded from the candidate set of resources.
According to an embodiment of the present disclosure, a second device for performing wireless communication may be presented. For example, the second device may include: one or more memories storing instructions; one or more transceivers; and one or more processors coupled to the one or more memories and the one or more transceivers. For example, one or more processors may execute instructions to: receiving New Radio (NR) side link control information (SCI) for scheduling a physical side link shared channel (PSSCH) from a first device over a physical side link control channel (PSCCH) based on Side Link (SL) resources; and receiving a Medium Access Control (MAC) Protocol Data Unit (PDU) from the first device over the PSSCH based on the SL resource, wherein the SL resource may be selected within a candidate resource set, wherein the candidate resource set included within a resource selection window determined within the resource pool may be updated based on a result of the sensing, wherein the updating of the candidate resource set based on the result of the sensing may include: integer M1 resources adjacent to a resource associated with a Long Term Evolution (LTE) SCI and frequencies of the resources associated with the LTE SCI are excluded from the candidate set of resources.
For example, the LTE SL related resources may be determined based on LTE SL bins and NR SL bins, LTE SL bins may be generated based on LTE SL subcarrier spacing (SCS), NR SL bins may be generated based on NR SL SCS, and the LTE SL bin related resources may be determined as LTE SCI related resources based on LTE SL bins and NR SL bins overlapping.
The various embodiments of the present disclosure may be combined with each other.
Hereinafter, an apparatus to which the respective embodiments of the present disclosure may be applied will be described.
The various descriptions, functions, procedures, suggestions, methods and/or operational flows of the present disclosure described in this document may be applied to, but are not limited to, various fields requiring wireless communication/connection (e.g., 5G) between devices.
Hereinafter, a description will be given in more detail with reference to the accompanying drawings. In the following figures/description, like reference numerals may refer to like or corresponding hardware, software, or functional blocks unless otherwise specified.
Fig. 14 shows a communication system 1 according to an embodiment of the present disclosure.
Referring to fig. 14, 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 (100 a), vehicles (100 b-1, 100 b-2), augmented reality (XR) devices (100 c), handheld devices (100 d), home appliances (100 e), internet of things (IoT) devices (100 f), and Artificial Intelligence (AI) devices/servers (400). For example, the vehicles may include vehicles having wireless communication functions, autonomous vehicles, and vehicles capable of performing inter-vehicle communication. Herein, a vehicle may include an Unmanned Aerial Vehicle (UAV) (e.g., an unmanned aerial vehicle). The XR device may include an Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality (MR) device and may be implemented in the form of a head-mounted device (HMD), head-up display (HUD) mounted in a vehicle, television, smart phone, computer, wearable device, home appliance device, digital signage, vehicle, robot, or the like. Handheld devices may include smartphones, smartpads, wearable devices (e.g., smartwatches 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 (200 a) may operate as a BS/network node relative to other wireless devices.
Here, the wireless communication technology implemented in the wireless devices 100a to 100f of the present disclosure may include a narrowband internet of things for low power communication in addition to LTE, NR, and 6G. In this case, for example, the NB-IoT technology may be an example of Low Power Wide Area Network (LPWAN) technology and may be implemented as standards such as LTE Cat NB1 and/or LTE Cat NB2, not limited to the names described above. Additionally or alternatively, wireless communication techniques implemented in the wireless devices 100 a-100 f of the present disclosure may perform communications based on LTE-M techniques. In this case, as an example, the LTE-M technology may be an example of an LPWAN, and may be referred to as various names including enhanced machine type communication (eMTC), and the like. For example, LTE-M technology may be implemented as at least any of various standards such as, but not limited to, 1) LTE CAT 0, 2) LTE CAT M1, 3) LTE CAT M2, 4) LTE non-bandwidth limited (non-BL), 5) LTE-MTC, 6) LTE machine type communications, and/or 7) LTE M. Additionally or alternatively, the wireless communication technology implemented in the wireless devices 100a to 100f of the present disclosure may include at least one of bluetooth, a Low Power Wide Area Network (LPWAN), and ZigBee in view of low power communication, and is not limited to the above names. As an example, the ZigBee technology may generate a Personal Area Network (PAN) related to small/low power digital communication based on various standards including IEEE 802.15.4 and the like, and may be referred to as various names.
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 be connected 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 passing 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). An IoT device (e.g., a sensor) may perform direct communication 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 100a through 100f/BS200 or BS200/BS 200. Here, the 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, access backhaul Integration (IAB)). The wireless device and BS/wireless device may transmit/receive radio signals to/from each other over wireless communication/connections 150a and 150 b. For example, the wireless communication/connections 150a and 150b may transmit/receive signals over various physical channels. To this end, at least a part of various configuration information configuration procedures for transmitting/receiving radio signals, various signal processing procedures (e.g., channel coding/decoding, modulation/demodulation, and resource mapping/demapping), and resource allocation procedures may be performed based on various proposals of the present disclosure.
Fig. 15 illustrates a wireless device according to an embodiment of the present disclosure.
Referring to fig. 15, the first wireless device (100) and the second wireless device (200) may transmit radio signals through various RATs (e.g., LTE and NR). Herein, { the first wireless device (100) and the second wireless device (200) } may correspond to { wireless device (100 x) and BS (200) } and/or { wireless device (100 x) and wireless device (100 x) } in fig. 14.
The first wireless device 100 may include one or more processors 102 and one or more memories 104, and may additionally further include one or more transceivers 106 and/or one or more antennas 108. The processor(s) 102 may control the memory(s) 104 and/or transceiver(s) 106 and may be configured to implement the descriptions, functions, processes, proposals, methods and/or operational flows disclosed herein. For example, the processor(s) 102 may process the information in the memory(s) 104 to generate first information/signals and then transmit radio signals including the first information/signals through the transceiver(s) 106. The processor(s) 102 may receive radio signals including the second information/signals through the transceiver 106 and then store information resulting from processing the second information/signals in the memory(s) 104. The memory(s) 104 may be connected to the processor(s) 102 and may store various information related to the operation of the processor(s) 102. For example, the memory(s) 104 may store software code including instructions for performing part or all of the processing controlled by the processor(s) 102 or for performing the descriptions, functions, procedures, suggestions, methods, and/or operational flows disclosed herein. Here, the processor(s) 102 and the memory(s) 104 may be part of a communication modem/circuit/chip designed to implement a RAT (e.g., LTE or NR). The transceiver(s) 106 may be connected to the processor(s) 102 and transmit and/or receive radio signals through the antenna(s) 108. Each transceiver 106 may include a transmitter and/or a receiver. The transceiver(s) 106 may be used interchangeably with Radio Frequency (RF) unit(s). 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 may additionally further include one or more transceivers 206 and/or one or more antennas 208. The processor(s) 202 may control the memory(s) 204 and/or transceiver(s) 206 and may be configured to implement the descriptions, functions, processes, proposals, methods and/or operational flows disclosed herein. For example, the processor(s) 202 may process the information in the memory(s) 204 to generate third information/signals and then transmit radio signals including the third information/signals through the transceiver(s) 206. The processor(s) 202 may receive radio signals including fourth information/signals through the transceiver(s) 106 and then store information resulting from processing the fourth information/signals in the memory(s) 204. The memory(s) 204 may be connected to the processor(s) 202 and may store various information related to the operation of the processor(s) 202. For example, memory(s) 204 may store software code including instructions for performing part or all of the processing controlled by processor(s) 202 or for performing the descriptions, functions, procedures, suggestions, methods, and/or operational flows disclosed herein. Here, the processor(s) 202 and the memory(s) 204 may be part of a communication modem/circuit/chip designed to implement a RAT (e.g., LTE or NR). The transceiver(s) 206 may be connected to the processor(s) 202 and transmit and/or receive radio signals through the antenna(s) 208. Each transceiver 206 can include a transmitter and/or a receiver. The transceiver(s) 206 may be used interchangeably with RF unit(s). In this disclosure, a wireless device may represent a communication modem/circuit/chip.
The hardware elements of wireless devices 100 and 200 will be described in more detail below. 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) according to the descriptions, functions, procedures, proposals, methods and/or operational flows disclosed herein. One or more processors 102 and 202 may generate messages, control information, data, or information in accordance with the descriptions, functions, procedures, suggestions, methods, and/or operational flows disclosed herein. The one or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and/or operational procedures disclosed herein 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 according to the descriptions, functions, procedures, proposals, methods, and/or operational procedures disclosed herein.
The one or more processors 102 and 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer. One or more of processors 102 and 202 may be implemented in hardware, firmware, software, or a combination thereof. For 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 flows 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, suggestions, methods, and/or operational flows disclosed in this document may be included in one or more processors 102 and 202 or stored in one or more memories 104 and 204, driven by one or more processors 102 and 202. The descriptions, functions, procedures, suggestions, methods and/or operational flows disclosed in this document may be implemented using software or firmware in the form of codes, commands and/or command sets.
The one or more memories 104 and 204 may be coupled to the one or more processors 102 and 202 and may 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 comprised of read-only memory (ROM), random-access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard drives, registers, cash 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 flows 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 flows disclosed herein from one or more other devices. For example, one or more transceivers 106 and 206 may be coupled to one or more processors 102 and 202 and may 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 flows disclosed herein through one or more antennas 108 and 208. In this document, the 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 to process the 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 comprise (analog) oscillators and/or filters.
Fig. 16 illustrates a signal processing circuit for transmitting a signal according to an embodiment of the present disclosure.
Referring to fig. 16, 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. 16 may be performed without limitation to the processor (102, 202) and/or transceiver (106, 206) of fig. 15. The hardware elements of fig. 16 may be implemented by the processor (102, 202) and/or the transceiver (106, 206) of fig. 15. Blocks 1010 through 1060 may be implemented, for example, by the processor (102, 202) of fig. 15. Alternatively, blocks 1010 through 1050 may be implemented by the processor (102, 202) of fig. 15, and block 1060 may be implemented by the transceiver (106, 206) of fig. 15.
The codeword may be converted into a radio signal via the signal processing circuit (1000) of fig. 16. 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 scrambled bit sequence by the scrambler 1010. The scrambling sequence used for scrambling may be generated based on an initial value, and the initial 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 scheme 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) to the corresponding antenna port(s) by precoder 1040. The output z of the precoder 1040 may be derived by multiplying the output y of the layer mapper 1030 by an N x M precoding matrix W. Here, 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 the modulation symbols for each antenna port to time-frequency resources. The time-frequency resources may include a plurality of symbols in the time domain (e.g., CP-OFDMA symbols and DFT-s-OFDMA symbols) 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 each antenna. 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 an up-converter.
The signal processing for the signals received in the wireless device may be configured in a manner that is inverse to the signal processing (1010-1060) of fig. 16. For example, a wireless device (e.g., 100, 200 of fig. 15) 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 codewords by a resource demapping process, a post-coding process, a demodulation processor, and a descrambling process. The codeword may be restored to the original information block by decoding. Accordingly, a signal processing circuit (not illustrated) for receiving a signal may include a signal restorer, a resource demapper, a post encoder, a demodulator, a descrambler, and a decoder.
Fig. 17 illustrates another example of a wireless device according to an embodiment of the present disclosure. The wireless device may be implemented in various forms according to use cases/services (refer to fig. 14).
Referring to fig. 17, a wireless device (100, 200) may correspond to the wireless device (100, 200) of fig. 15 and may be configured by various elements, components, units/portions and/or modules. For example, each of the wireless devices (100, 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(s) (114). For example, the communication circuit (112) may include one or more processors (102, 202) and/or one or more memories (104, 204) of fig. 15. For example, the transceiver(s) (114) may include one or more transceivers (106, 206) and/or one or more antennas (108, 208) of fig. 15. 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/code/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 device) via the communication unit (110) through a wireless/wired interface, or store information received from the outside (e.g., other communication device) via the communication unit (110) through a wireless/wired interface in the memory unit (130).
The add-on component (140) may be variously configured according to the type of wireless device. For example, the additional component (140) may include at least one of a power unit/battery, an input/output (I/O) unit, a driving unit, and a computing unit. The wireless device may be implemented in, but is not limited to, the following form: robot (100 a of fig. 14), vehicle (100 b-1 and 100b-2 of fig. 14), XR device (100 c of fig. 14), handheld device (100 d of fig. 14), home appliance (100 e of fig. 14), ioT device (100 f of fig. 14), digital broadcast terminal, hologram device, public safety device, MTC device, medical device, financial science and technology device (or financial device), security device, climate/environment device, AI server/device (400 of fig. 14), BS (200 of fig. 14), network node, etc. Depending on the use case/service, the wireless device may be used in a mobile or stationary location.
In fig. 17, various elements, components, units/portions and/or modules in the wireless device (100, 200) may all be connected to each other through a wired interface, or at least portions thereof may be connected wirelessly through the communication unit (110). For example, in each of the wireless devices (100, 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, 140) may be connected wirelessly by the communication unit (110). Each element, component, unit/section and/or module within the wireless device (100, 200) may also include one or more elements. For example, the control unit (120) may be constructed by a set of one or more processors. As an example, the control unit (120) may be constructed 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 constructed from 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. 17 will be described in detail with reference to the accompanying drawings.
Fig. 18 illustrates a handheld device according to an 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). The 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. 18, 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 (140 a), an interface unit (140 b), and an I/O unit (140 c). The antenna unit (108) may be configured as part of a communication unit (110). Blocks 110 through 130/140a through 140c correspond to blocks 110 through 130/140, respectively, of fig. 17.
The communication unit 110 may transmit and receive signals (e.g., data signals 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. 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 to 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.
For 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 the 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.
Fig. 19 illustrates a vehicle or autonomous vehicle according to an embodiment of the present disclosure. The vehicle or autonomous vehicle may be implemented by a mobile robot, a car, a train, a manned/unmanned Aircraft (AV), a ship, or the like.
Referring to fig. 19, a vehicle or autonomous vehicle (100) may include an antenna unit (108), a communication unit (110), a control unit (120), a driving unit (140 a), a power supply unit (140 b), a sensor unit (140 c), and an autonomous driving unit (140 d). The antenna unit (108) may be configured as part of a communication unit (110). Blocks 110/130/140a through 140d correspond to blocks 110/130/140, respectively, of FIG. 17.
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., gnbs 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 drive 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 devices, 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 acquired 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 according to 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 acquired data/information. The communication unit 110 may transmit information about the vehicle position, 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 specification may be combined to be implemented or performed in an apparatus, and the technical features in the apparatus claims may be combined to be implemented or performed in a method. In addition, the technical features in the method claim(s) and the apparatus claim(s) may be combined to be implemented or performed in the apparatus. In addition, technical features in the method claim(s) and the apparatus claim(s) may be combined to be implemented or performed in the method.
Claims (20)
1. A method for performing wireless communication by a first device, the method comprising:
triggering resource selection;
determining a resource selection window associated with the resource selection;
determining a set of candidate resources within the resource selection window;
performing sensing for at least one candidate slot for the resource selection; and
updating the candidate set of resources based on the result of the sensing,
wherein the result of the sensing is obtained based on Long Term Evolution (LTE) side link control information (SCI), and
wherein updating the candidate set of resources based on the sensed result comprises:
Integer M1 resources adjacent to the resources associated with the LTE SCI and frequencies of the resources associated with the LTE SCI are excluded from the candidate set of resources.
2. The method of claim 1, wherein the resource selection is related to a New Radio (NR) Side Link (SL) communication.
3. The method of claim 2, further comprising:
acquiring an LTE SL subcarrier spacing (SCS) based on the LTE SCI; and
acquiring an NR SL SCS associated with said NR SL communication,
wherein the updating of the candidate resource set based on the result of the sensing is performed based on the LTE SL SCS and the NR SL SCS being different.
4. The method of claim 2, further comprising:
acquiring an LTE SL subcarrier offset based on the LTE SCI; and
acquiring NR SL sub-carriers associated with said NR SL communication,
wherein updating of the candidate resource set based on the result of the sensing is performed based on the LTE SL subcarrier offset and the NR SL subcarrier offset being different.
5. The method of claim 2, further comprising:
acquiring an LTE SL Direct Current (DC) location based on the LTE SCI; and
an NR SL DC location associated with the NR SL communication is acquired,
Wherein the updating of the candidate set of resources based on the result of the sensing is performed based on the LTE SL DC location and the NR SL DC location being different.
6. The method of claim 2, further comprising:
acquiring an LTE SL SCS based on the LTE SCI;
acquiring an NR SL SCS based on the NR SL communication;
generating an LTE SL bin based on the LTE SL SCS;
generating an NR SL bin based on the NR SL SCS; and
determining the resources associated with the LTE SCI based on the LTE SL bin and the NR SL bin,
wherein, based on the LTE SL bin overlapping with the NR SL bin, a resource associated with the LTE SL bin is determined as the resource associated with the LTE SCI.
7. The method of claim 2, wherein the N2 is configured for each SCS associated with the NR SL communication.
8. The method of claim 1, wherein updating the set of candidate resources based on the sensed result comprises:
excluding from the candidate set of resources an integer number N1 of resources adjacent to the resources related to the LTE SCI and a time of the resources related to the LTE SCI,
wherein the N1 resources comprise an integer N2 resources before the resources related to the LTE SCI and an integer N3 resources after the resources related to the LTE SCI, and
Wherein, N1 is the sum of N2 and N3.
9. The method of claim 8, wherein the N2 and the N3 are different.
10. The method of claim 1, wherein the M1 resources comprise an integer M2 resources having a frequency higher than a frequency of the resources related to the LTE SCI and an integer M3 resources having a frequency lower than a frequency of the resources related to the LTE SCI, and
wherein, M1 is the sum of M2 and M3.
11. The method of claim 10, wherein the M2 and the M3 are different.
12. The method of claim 1, wherein the updating of the candidate set of resources based on the result of the sensing is performed based on a Reference Signal Received Power (RSRP) value measured according to the LTE SCI being greater than or equal to a first RSRP threshold.
13. The method of claim 12, wherein the first RSRP threshold is different from a second RSRP threshold used in NR SL communication.
14. A first device for performing wireless communications, the first device comprising:
one or more memories storing instructions;
one or more transceivers; and
One or more processors coupled to the one or more memories and the one or more transceivers, wherein the one or more processors execute the instructions to:
triggering resource selection;
determining a resource selection window associated with the resource selection;
determining a set of candidate resources within the resource selection window;
performing sensing for at least one candidate slot for the resource selection; and
updating the candidate set of resources based on the result of the sensing,
wherein the result of the sensing is obtained based on Long Term Evolution (LTE) side link control information (SCI), and
wherein updating the candidate set of resources based on the sensed result comprises:
integer M1 resources adjacent to the resources associated with the LTE SCI and frequencies of the resources associated with the LTE SCI are excluded from the candidate set of resources.
15. An apparatus adapted to control a first User Equipment (UE), the apparatus comprising:
one or more processors; and
one or more memories operably connected to the one or more processors and storing instructions, wherein the one or more processors execute the instructions to:
Triggering resource selection;
determining a resource selection window associated with the resource selection;
determining a set of candidate resources within the resource selection window;
performing sensing for at least one candidate slot for the resource selection; and
updating the candidate set of resources based on the result of the sensing,
wherein the result of the sensing is obtained based on Long Term Evolution (LTE) side link control information (SCI), and
wherein updating the candidate set of resources based on the sensed result comprises:
integer M1 resources adjacent to the resources associated with the LTE SCI and frequencies of the resources associated with the LTE SCI are excluded from the candidate set of resources.
16. A non-transitory computer-readable storage medium storing instructions that, when executed, cause a first device to:
triggering resource selection;
determining a resource selection window associated with the resource selection;
determining a set of candidate resources within the resource selection window;
performing sensing for at least one candidate slot for the resource selection; and
updating the candidate set of resources based on the result of the sensing,
wherein the result of the sensing is obtained based on Long Term Evolution (LTE) side link control information (SCI), and
Wherein updating the candidate set of resources based on the sensed result comprises:
integer M1 resources adjacent to the resources associated with the LTE SCI and frequencies of the resources associated with the LTE SCI are excluded from the candidate set of resources.
17. A method for performing wireless communication by a second device, the method comprising:
receiving New Radio (NR) side link control information (SCI) for scheduling a physical side link shared channel (PSSCH) from a first device over a physical side link control channel (PSCCH) based on Side Link (SL) resources; and
receiving a Medium Access Control (MAC) Protocol Data Unit (PDU) from the first device through the PSSCH based on the SL resource,
wherein the SL resource is selected within a candidate set of resources,
wherein the set of candidate resources included within the resource selection window determined within the resource pool is updated based on the sensed result,
wherein updating the candidate set of resources based on the sensed result comprises:
integer M1 resources adjacent to a Long Term Evolution (LTE) SCI related resource and the frequency of the resource related to the LTE SCI are excluded from the candidate set of resources.
18. The method of claim 17, wherein the resources related to the LTE SL are determined based on LTE SL bins and NR SL bins,
wherein the LTE SL bin is generated based on an LTE SL subcarrier spacing (SCS),
wherein the NR SL bin is generated based on NR SL SCS, and
wherein, based on the LTE SL bin overlapping with the NR SL bin, a resource associated with the LTE SL bin is determined as the resource associated with the LTE SCI.
19. A second device for performing wireless communications, the second device comprising:
one or more memories storing instructions;
one or more transceivers; and
one or more processors coupled to the one or more memories and the one or more transceivers, wherein the one or more processors execute the instructions to:
receiving New Radio (NR) side link control information (SCI) for scheduling a physical side link shared channel (PSSCH) from a first device over a physical side link control channel (PSCCH) based on Side Link (SL) resources; and
receiving a Medium Access Control (MAC) Protocol Data Unit (PDU) from the first device through the PSSCH based on the SL resource,
Wherein the SL resource is selected within a candidate resource set,
wherein the set of candidate resources included within the resource selection window determined within the resource pool is updated based on the sensed result,
wherein updating the candidate set of resources based on the sensed result comprises:
integer M1 resources adjacent to a Long Term Evolution (LTE) SCI related resource and the frequency of the resource related to the LTE SCI are excluded from the candidate set of resources.
20. The second device of claim 19, wherein the resources related to the LTE SL are determined based on LTE SL bin and NR SL bin,
wherein the LTE SL bin is generated based on an LTE SL subcarrier spacing (SCS),
wherein the NR SL bin is generated based on NR SL SCS, and
wherein, based on the LTE SL bin overlapping with the NR SL bin, a resource associated with the LTE SL bin is determined as the resource associated with the LTE SCI.
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| Application Number | Priority Date | Filing Date | Title |
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| KR20210078322 | 2021-06-16 | ||
| KR10-2021-0078327 | 2021-06-16 | ||
| KR10-2021-0078322 | 2021-06-16 | ||
| PCT/KR2022/008484 WO2022265397A1 (en) | 2021-06-16 | 2022-06-15 | Method and device for selecting nr sl resource by considering lte sl |
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| CN117480829A true CN117480829A (en) | 2024-01-30 |
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| CN202280041899.4A Pending CN117480829A (en) | 2021-06-16 | 2022-06-15 | Method and apparatus for selecting NR SL resources by considering LTE SL |
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