CN117480844A - Method and apparatus for coexistence of SL communications based on different RATs in NR V2X - Google Patents
Method and apparatus for coexistence of SL communications based on different RATs in NR V2X Download PDFInfo
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Abstract
A method for a first apparatus to perform wireless communication and an apparatus supporting the same are provided. The method comprises the following steps: obtaining information related to a first resource pool for Long Term Evolution (LTE) side chain (SL) communication; obtaining information related to a second resource pool for NR SL communication; triggering resource selection in a first time slot; determining a selection window based on the first time slot and a Packet Delay Budget (PDB); and based on the sensing, selecting a first SL resource in a time slot belonging to the second resource pool in a selection window, wherein the first SL resource may be a resource included in a time slot overlapping the time domain and a beginning of a first subframe in the first resource pool.
Description
Technical Field
The present disclosure relates to wireless communication systems.
Background
Sidelink (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 a base station. SL communication is being considered as a solution for the overhead of base stations due to the rapid growth 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.
Furthermore, as more and more communication devices require larger communication capacity, the need for enhanced mobile broadband communication relative to conventional Radio Access Technologies (RATs) is rising. Thus, communication system designs for UEs or services that are sensitive to reliability and delay have also been discussed. Also, next generation radio access technologies based on enhanced mobile broadband communication, large-scale Machine Type Communication (MTC), ultra-reliable low latency communication (URLLC), etc. may be referred to as new RATs (radio access technologies) or NR (new radios). Herein, NR may also support vehicle-to-everything (V2X) communication.
Fig. 1 is a diagram for describing NR based V2X communication compared to V2X communication based on RAT used before NR. The embodiment of fig. 1 may be combined with various embodiments of the present disclosure.
Regarding V2X communication, when discussing RATs used before NR, a scheme of providing security services based on V2X messages such as BSM (basic security message), CAM (cooperative awareness message), and DENM (distributed environment notification message) is focused. 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, such various V2X scenarios may include vehicle queuing, advanced driving, extension sensors, remote driving, and the like.
Disclosure of Invention
Technical problem
Meanwhile, if Transmission Time Intervals (TTIs) between Long Term Evolution (LTE) SL and NR SL are different, a transient period may occur in between LTE SL or NR SL transmissions if the UE simultaneously transmits LTE SL and NR SL. From the reception perspective of the UE, additional Automatic Gain Control (AGC) may be required in the middle of LTE SL or NR SL reception, or AGC performed only at the receiving front end may be inefficient. More specifically, if the UE has performed AGC on the first symbol in a subframe of the LTE SL and the NR SL transmission starts in the middle of LTE SL reception, some signals (exceeding the maximum received power configured by AGC) may be clipped due to a sudden increase in total received power.
Technical proposal
In an embodiment, a method for performing wireless communication by a first device is provided. The method may include: obtaining information related to a first resource pool for Long Term Evolution (LTE) side chain (SL) communication; obtaining information related to a second resource pool for NR SL communication; triggering resource selection in a first time slot; determining a selection window based on the first time slot and a Packet Delay Budget (PDB); and selecting, based on the sensing, a first SL resource among the slots belonging to the second resource pool within the selection window, wherein the first SL resource is a resource included in a slot overlapping with a start of the first subframe within the first resource pool in the time domain.
In an embodiment, a first device adapted to perform wireless communication is provided. 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: obtaining information related to a first resource pool for Long Term Evolution (LTE) side chain (SL) communication; obtaining information related to a second resource pool for NR SL communication; triggering resource selection in a first time slot; determining a selection window based on the first time slot and a Packet Delay Budget (PDB); and based on the sensing, selecting a first SL resource among the time slots belonging to the second resource pool within the selection window, wherein the first SL resource is a resource included in a time slot overlapping with a start of the first subframe within the first resource pool in the time domain.
In an embodiment, a processing device is provided that is adapted to control a first device performing wireless communication. The processing device may include: one or more processors; and one or more memories operatively connected to the one or more processors and storing instructions. The one or more processors may execute instructions to: obtaining information related to a first resource pool for Long Term Evolution (LTE) side chain (SL) communication; obtaining information related to a second resource pool for NR SL communication; triggering resource selection in a first time slot; determining a selection window based on the first time slot and a Packet Delay Budget (PDB); and based on the sensing, selecting a first SL resource among the time slots belonging to the second resource pool within the selection window, wherein the first SL resource is a resource included in a time slot overlapping with a start of the first subframe within the first resource pool in the time domain.
Advantageous effects
SL communication based on different RATs can coexist efficiently.
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 in accordance with an embodiment of the present disclosure.
Fig. 4 shows a structure of a radio frame of NR based on an embodiment of the present disclosure.
Fig. 5 shows a structure of a slot of an NR frame according to an embodiment of the present disclosure.
Fig. 6 shows 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 and 11 show examples where some signals are clipped if the NR SL transmission starts in the middle of LTE SL reception.
Fig. 12 shows an example where LTE SL and NR SL have the same TTI according to an embodiment of the present disclosure.
Fig. 13 illustrates a method for a UE to apply slot aggregation to NR SL according to an embodiment of the present disclosure.
Fig. 14 illustrates a method in which a UE preferentially selects resources included in an earliest slot among NR SL slots overlapping with an LTE SL subframe according to an embodiment of the present disclosure.
Fig. 15 illustrates an example of avoiding clipping problems by preferentially selecting the earliest NR SL slot among a plurality of NR SL slots overlapping with an LTE SL subframe according to an embodiment of the present disclosure.
Fig. 16 illustrates a method for performing wireless communication by a first device, in accordance with an embodiment of the present disclosure.
Fig. 17 illustrates a method for performing wireless communication by a second apparatus, in accordance with an embodiment of the present disclosure.
Fig. 18 shows a communication system 1 according to an embodiment of the present disclosure.
Fig. 19 illustrates a wireless device according to an embodiment of the present disclosure.
Fig. 20 illustrates a signal processing circuit for transmitting a signal in accordance with an embodiment of the present disclosure.
Fig. 21 illustrates another example of a wireless device in accordance with an embodiment of the present disclosure.
Fig. 22 illustrates a handheld device in accordance with an embodiment of the present disclosure.
Fig. 23 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 "PDDCH" 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 transport channel. The transmission 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 transmission 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 Unacknowledged 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 transfer 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 the Packet Data Convergence Protocol (PDCP) in the user plane include transmission of user data, header compression, and ciphering. The functions of the Packet Data Convergence Protocol (PDCP) in the control plane include transmission 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 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 that transmit (or transport) data from a network to a UE include a Broadcast Channel (BCH) that transmits system information and a downlink Shared Channel (SCH) that transmits 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 below shows the number of symbols per slot (N) according to SCS setting (u) in the case of employing normal CP slot symb ) Number of slots per frame (N frame,u slot ) And the number of slots per subframe (N subframe,u slot )。
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 the 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.
Can be defined by point A, offset (N start BWP ) Sum bandwidth (N) size BWP ) To configure BWP. 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 Secondary Link Synchronization Signal (SLSS) may include a primary secondary link synchronization signal (PSSS) and a secondary link synchronization signal (SSSS) as SL specific sequences. The PSSS may be referred to as a secondary link primary synchronization signal (S-PSS), and the SSSS may be referred to as a secondary 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 Sidelink 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 sidelink synchronization signal block (S-SSB). The S-SSB may have the same parameter set (i.e., SCS and CP length) as the physical secondary link control channel (PSCCH)/physical secondary link shared channel (PSSCH) in the carrier, and the transmission bandwidth may exist within the (pre) configured Secondary 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 a first device 100 and UE 2 may be a second device 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 secondary link control information (SCI) to UE 2 over a physical secondary link control channel (PSCCH), and thereafter transmit SCI-based data to UE 2 over a physical secondary 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, a UE may assist in SL resource selection for another UE. For example, in NR resource allocation mode 2, a grant of configuration for SL transmission may be provided/allocated to the UE. For example, in NR resource allocation mode 2, a UE may schedule SL transmissions for another UE. 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, UE 1 may use SCI to indicate priority of SL transmissions to UE 2. For example, UE 2 may decode the SCI and UE 2 may perform sensing and/or resource (re) selection based on priority. For example, the resource (re) selection procedure may comprise the step of UE 2 identifying candidate resources in a resource selection window, and the step of UE 2 selecting resources for (re) transmission among the identified candidate resources. For example, the resource selection window may be a time interval for the UE to select resources for SL transmission. For example, after UE 2 triggers a resource (re) selection, the resource selection window may start at T1+.0, and the resource selection window may be limited by the UE 2's remaining packet delay budget. For example, in the step of UE 2 identifying a candidate resource in the resource selection window, if the SCI received by UE 2 from UE 1 indicates a specific resource and if the L1 SL RSRP threshold for the specific resource exceeds the SL RSRP threshold, UE 2 may not determine the specific resource as a candidate resource. For example, the SL RSRP threshold may be determined based on the priority of the SL transmissions indicated by SCI received by UE 2 from UE 1 and the priority of the SL transmissions on the resources selected by UE 2.
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 configured or pre-configured in the time domain for each resource pool. For example, PDSCH DMRS configuration type 1 and/or type 2 may be the same or similar to the frequency domain pattern of PSSCH DMRS. For example, the correct 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 DMRS patterns configured or preconfigured for the resource pool.
For example, in NR resource allocation mode 2, the transmitting UE may perform initial transmission of a Transport Block (TB) based on a sensing and resource (re) selection procedure without reservation. For example, the transmitting UE may reserve SL resources for initial transmission of the second TB using SCI associated with the first/initial RB based on the sensing and resource (re) selection procedure.
For example, in NR resource allocation mode 2, the ue may reserve resources for feedback-based PSSCH retransmissions through signaling related to previous transmissions of the same TB. For example, the maximum number of SL resources reserved for one transmission including the current transmission may be 2, 3, or 4. 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 may be up to 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 for releasing resources not used by the UE may be supported.
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 subchannels 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 may be configured for the UE or may be preconfigured.
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) in fig. 9 shows broadcast-type SL communication, (b) in fig. 9 shows unicast-type SL communication, and (c) in fig. 9 shows multicast-type SL communication. In the case of unicast-type SL communication, a UE may perform one-to-one communication for another UE. In the case of multicast type SL transmission, the UE may perform SL communication for one or more UEs in a group to which the UE belongs. In various embodiments of the present disclosure, SL multicast communications may be replaced with SL multicast communications, SL one-to-many communications, and the like.
Hereinafter, a hybrid automatic repeat request (HARQ) process will be described.
In the case of SL unicast and SL multicast, HARQ feedback and HARQ combining in the physical layer may be supported. For example, in case that the receiving UE operates in the resource allocation mode 1 or 2, the receiving UE may receive the PSSCH from the transmitting UE, and the receiving UE may transmit HARQ feedback corresponding to the PSSCH to the transmitting UE through a Physical Sidelink Feedback Channel (PSFCH) using a Sidelink Feedback Control Information (SFCI) format.
For example, SL HARQ feedback may be enabled for unicast. In this case, in a non-code block group (non-CBG), the receiving UE may decode the PSCCH targeted to the receiving UE, and when the receiving UE successfully decodes a transport block related to the PSCCH, the receiving UE may generate the HARQ-ACK. Thereafter, the receiving UE may transmit the HARQ-ACK to the transmitting UE. In contrast, after the receiving UE decodes the PSCCH targeted to the receiving UE, if the receiving UE fails to successfully decode a transport block associated with the PSCCH, the receiving UE may generate a HARQ-NACK and the receiving UE may transmit the HARQ-NACK to the transmitting UE.
For example, SL HARQ feedback may be enabled for multicast. For example, during non-CBG, two different types of HARQ feedback options may be supported for multicast.
(1) Multicast option 1: after decoding the PSCCH targeted to the receiving UE, the receiving UE may send a HARQ-NACK to the transmitting UE via the PSFCH if the receiving UE fails to decode a transport block associated with the PSCCH. In contrast, when the receiving UE decodes the PSCCH targeted to the receiving UE, and when the receiving UE successfully decodes the transport block associated with the PSCCH, the receiving UE does not transmit the HARQ-ACK to the transmitting UE.
(2) Multicast option 2: after decoding the PSCCH targeted to the receiving UE, the receiving UE may send a HARQ-NACK to the transmitting UE via the PSFCH if the receiving UE fails to decode a transport block associated with the PSCCH. And, when the receiving UE decodes the PSCCH targeted to the receiving UE and when the receiving UE successfully decodes a transport block associated with the PSCCH, the receiving UE may transmit the HARQ-ACK to the transmitting UE via the PSFCH.
For example, if multicast option 1 is used in SL HARQ feedback, all UEs performing multicast communication may share PSFCH resources. For example, UEs belonging to the same group may transmit HARQ feedback by using the same PSFCH resource.
For example, if multicast option 2 is used in SL HARQ feedback, each UE performing multicast communication may use different PSFCH resources for HARQ feedback transmission. For example, UEs belonging to the same group may transmit HARQ feedback by using different PSFCH resources.
For example, when SL HARQ feedback is enabled for multicast, the receiving UE may determine whether to transmit HARQ feedback to the transmitting UE based on a transmit-receive (TX-RX) distance and/or a Reference Signal Received Power (RSRP).
For example, in the multicast option 1, in case of HARQ feedback based on TX-RX distance, if the TX-RX distance is less than or equal to the communication range requirement, the receiving UE may transmit HARQ feedback in response to the PSSCH to the transmitting UE. Otherwise, if the TX-RX distance is greater than the communication range requirement, the receiving UE may not transmit HARQ feedback in response to the PSSCH to the transmitting UE. For example, the transmitting UE may inform the receiving UE of the location of the transmitting UE through the SCI associated with the PSSCH. For example, the SCI associated with the PSSCH may be a second SCI. For example, the receiving UE may estimate or obtain the TX-RX distance based on the location of the receiving UE and the location of the transmitting UE. For example, the receiving UE may decode the SCI associated with the PSSCH and thus may be aware of the communication range requirements for the PSSCH.
For example, in the case of resource allocation pattern 1, the time (offset) between PSFCH and PSSCH may be configured or preconfigured. In the case of unicast and multicast, if retransmission must be made on SL, it can be indicated to BS by UE in coverage using PUCCH. The transmitting UE may transmit an indication to a serving BS of the transmitting UE in the form of a Scheduling Request (SR)/Buffer Status Report (BSR) instead of the HARQ ACK/NACK. In addition, the BS may schedule SL retransmission resources for the UE even if the BS does not receive the indication. For example, in the case of resource allocation pattern 2, the time (offset) between PSFCH and PSSCH may be configured or preconfigured.
For example, from the perspective of UE transmission in a carrier, TDM between PSCCH/PSSCH and PSFCH may be allowed for the PSFCH format for SL in the slot. For example, a sequence-based PSFCH format with a single symbol may be supported. Herein, the single symbol may not be the AGC duration. For example, the sequence-based PSFCH format may be applied to unicast and multicast.
For example, in a time slot associated with a resource pool, the PSFCH resources may be periodically configured for N time slot durations, or may be preconfigured. For example, N may be configured to one or more values greater than or equal to 1. For example, N may be 1, 2 or 4. For example, HARQ feedback for transmissions in a particular resource pool may be transmitted over PSFCH only on the particular resource pool.
For example, if the transmitting UE transmits the PSSCH to the receiving UE across slots #x to #n, the receiving UE may transmit HARQ feedback in response to the PSSCH to the transmitting UE in slot# (n+a). For example, slot# (n+a) may include PSFCH resources. Herein, for example, a may be a minimum integer greater than or equal to K. For example, K may be the number of logical time slots. In this case, K may be the number of time slots in the resource pool. Alternatively, K may be the number of physical time slots, for example. In this case, K may be the number of slots inside or outside the resource pool.
For example, if the receiving UE transmits HARQ feedback on the PSFCH resources in response to one PSSCH that the transmitting UE transmits to the receiving UE, the receiving UE may determine the frequency and/or code domain of the PSFCH resources based on an implicit mechanism in the configured resource pool. For example, the receiving UE may determine the frequency and/or code domain of the PSFCH resource based on at least one of a slot index associated with the PSCCH/PSSCH/PSFCH, a subchannel associated with the PSCCH/PSSCH, or an identifier identifying each receiving UE in the group of HARQ feedback based on multicast option 2. Additionally/alternatively, for example, the receiving UE may determine a frequency domain and/or a code domain of the PSFCH resource based on at least one of SL RSRP, SINR, L1 source ID, and/or location information.
For example, if the HARQ feedback transmission through the PSFCH of the UE overlaps with the HARQ feedback reception through the PSFCH, the UE may select any one of the HARQ feedback transmission through the PSFCH and the HARQ feedback reception through the PSFCH based on a priority rule. For example, the priority rule may be based at least on a priority indication of the associated PSCCH/PSCCH.
For example, if HARQ feedback transmissions by a UE over a PSFCH overlap for multiple UEs, the UE may select a particular HARQ feedback transmission based on a priority rule. For example, the priority rule may be based on a lowest priority indication of the associated PSCCH/PSCCH.
Hereinafter, the secondary 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 transmit two consecutive SCIs (e.g., level 2 SCIs) on the PSCCH and/or PSSCH to the receiving UE. The receiving UE may decode two consecutive SCIs (e.g., level 2 SCIs) to receive the PSSCH from the transmitting UE. For example, if the SCI configuration field is divided into two groups in view of a (relatively) high SCI payload size, the SCI comprising the first SCI configuration field group may be referred to as a first SCI or a first SCI, and the SCI comprising the second SCI configuration field group may be referred to as a second SCI or a second SCI. For example, the transmitting UE may transmit the first SCI to the receiving UE over the PSCCH. For example, the transmitting UE may transmit the second SCI to the receiving UE on the PSCCH and/or PSSCH. For example, the second SCI may be transmitted to the receiving UE over a (separate) PSCCH or may be transmitted in a piggybacked manner with the data over a PSSCH. For example, two consecutive SCIs may also be applied to different transmissions (e.g., unicast, broadcast, or multicast).
For example, the transmitting UE may transmit all or part of information described below to the receiving UE through the SCI. Herein, for example, the transmitting UE may transmit all or part of information described below to the receiving UE through the first SCI and/or the second SCI.
PSSCH and/or PSCCH related resource allocation information, e.g., number/location of time/frequency resources, resource reservation information (e.g., periodicity), 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 transmit indicator (or SL (L1) RSRP (and/or SL (L1) RSRQ and/or SL (L1) RSSI) information transmit indicator) on the PSSCH), and/or
-Modulation Coding Scheme (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 traffic/packets to be transmitted), 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)
-transmitting location information of the UE or location (or distance zone) information of the target receiving UE (requested for SL HARQ feedback), 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 the pattern of (time-frequency) mapping resources of the DMRS, rank information, antenna port index information.
For example, the first SCI may include information related to channel interception. For example, the receiving UE may decode the second SCI by using PSSCH DMRS. The polarization 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 equal for unicast, multicast and broadcast. After decoding the first SCI, the receiving UE does not have to perform blind decoding on the second SCI. For example, the first SCI may include scheduling information for the second SCI.
Further, 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 over the PSCCH, the PSCCH may be replaced by at least one of the SCI, the first SCI, and/or the second SCI. Additionally/alternatively, for example, the SCI may be replaced by at least one of the PSCCH, the first SCI, or the second SCI. Additionally/alternatively, the PSSCH may be replaced by the second SCI, e.g., because the transmitting UE may transmit the second SCI to the receiving UE via the PSSCH.
In the present disclosure, the term "configured/configured or defined/defined" may be interpreted as (pre) configured from a base station or a network (via predefined signaling (e.g., SIB, MAC signaling, RRC signaling)). For example, "a may be configured" may include "base station or network (pre) configuring/defining or informing a to UE". Alternatively, the term "configure/configured or defined/defined" may be interpreted as preconfigured or predefined in the system. For example, "a may be configured" may include "a is preconfigured/defined in the system".
The resource pool may be a set of time-frequency resources that can be used for SL transmission and/or SL reception. From the UE's perspective, the time domain resources within the resource pool may be discontinuous. Multiple resource pools may be (pre) configured for a UE within a single carrier. From the physical layer perspective, the UE may perform unicast communications, multicast communications, and broadcast communications using a configured or preconfigured resource pool.
Meanwhile, in next generation systems, UEs may be allowed to transmit and/or receive side link channels/signals based on different RATs (e.g., LTE and/or NR) on a single carrier or cell. In embodiments of the present disclosure, the above-described case can be extended to a case where a UE performs side link transmission and reception operations based on a plurality of different RATs simultaneously using a single RF device and/or a single baseband (BB) device. Meanwhile, depending on the RAT, waveforms and/or signal generation methods and/or Direct Current (DC) positions and/or subcarrier spacing (SCS) and/or subcarrier offset and/or CP length, etc. for side link transmission and reception or reception of PSCCH and/or PSSCH may be different. More specifically, in case of the LTE side link, an SC-FDMA or DFT-predictive OFDM scheme may be used, and SCs may be 15kHz, and DC position may have a subcarrier offset of 7.5kHz in the center of system bandwidth, and CP length can be normal CP and extended CP. On the other hand, in case of NR side link, OFDM or CP-OFDM scheme may be used and depending on (pre) configuration, SCS may be 15kHz, 30kHz, 60kHz, 120kHz, etc., and depending on (pre) configuration, DC position may be a specific subcarrier position within SL BWP or RB grid or a specific position outside SL BWP or RB grid, and depending on (pre) configuration, subcarrier offset may be +7.5kHz, 0kHz, -7.5kHz, and CP length may be normal CP, and CP length may be extended CP only if SCS is 60 kHz. In addition, in the case of the LTE side link, all SYMBOLs in a subframe or slot are available for SL communication, whereas in the case of the NR side link, only a SYMBOL period equal to the number of SL SYMBOLs (hereinafter referred to as sl_symbol_length) in a slot starting from a starting SL SYMBOL index (hereinafter referred to as sl_symbol_start) configured in the (pre) configuration may be available for SL communication.
Meanwhile, if Transmission Time Intervals (TTI) between LTE SL and NR SL are different, a transient period may occur in the middle of LTE SL or NR SL transmission if UE transmits LTE SL and NR SL simultaneously. From the reception perspective of the UE, additional Automatic Gain Control (AGC) may be required in the middle of LTE SL or NR SL reception, or AGC performed only at the front end of reception may be inefficient to operate. More specifically, if the UE has performed AGC on the first symbol in a subframe of the LTE SL and the NR SL transmission starts in the middle of LTE SL reception, some signals (exceeding the maximum received power of the AGC configuration) may be clipped due to a sudden increase in the total received power.
Fig. 10 and 11 show examples where some signals are clipped if the NR SL transmission starts in the middle of LTE SL reception. The embodiments of fig. 10 and 11 may be combined with various embodiments of the present disclosure.
Referring to fig. 10, it is assumed that the UE performs LTE SL reception in subframe a within a resource pool for LTE SL communication. In this case, the UE may perform AGC operations at the beginning of subframe a (e.g., AGC symbol). Further, it is assumed that the UE performs NR SL reception in slot B within the resource pool for NR SL communication. Here, it is assumed that SCS for NR SL communication is 30kHz. In this case, some signals may be clipped, as shown in the embodiment of fig. 11.
Specifically, referring to fig. 11, if a UE that has performed AGC for LTE SL reception additionally performs NR SL reception during LTE SL reception, some signals may exceed the maximum received power configured by AGC. As a result, some signals may be clipped.
Alternatively, the UE may perform AGC if both LTE SL and NR SL are present in the first symbol within a subframe or slot. In this case, if the intermediate NR SL received at the LTE SL no longer exists, the reception power of the UE may be relatively small and the quantization level adjusted by the initial AGC may be inefficient. Therefore, quantization errors may occur.
Based on various embodiments of the present disclosure, a method for coexistence of SL communications based on different RATs and an apparatus supporting the method are described. For convenience of description, the description will focus on coexistence of LTE SL and NR SL, but the technical ideas of the present disclosure are not limited thereto. The technical ideas of the present disclosure may also be applied to coexistence of communications based on different RATs.
For example, if the UE performs side link channel/signaling and/or reception based on different RATs (e.g., LTE and/or NR) in a single carrier or cell, the UE may expect/determine that LTE SL and NR SL have the same TTI. More specifically, for example, the same TTI may include that SCS of NR SL is the same as SCS of LTE SL (e.g., 15 kHz). For example, the same TTI may include sl_symbol_start being set to the first SYMBOL in the slot (index value 0), and/or sl_symbol_length being set to 14 in the SL BWP configuration for NR SL. For example, the same TTI may include no PSFCH resources being configured in the resource pool configuration for the NR SL (e.g., PSFCH resource period value of 0). For example, the boundaries of the TTI for LTE SL and the TTI for NR SL may be aligned. Alternatively, for example, the time difference between the boundaries of the TTI for LTE SL and the TTI for NR SL may be less than or equal to a certain level (e.g., 32 microseconds or equivalent value or CP length).
Fig. 12 shows an example where LTE SL and NR SL have the same TTI according to an embodiment of the present disclosure. The embodiment of fig. 12 may be combined with various embodiments of the present disclosure.
Referring to fig. 12, the ue may expect/determine that the TTI of LTE SL and the TTI of NR SL are the same. For example, the SCS of NR SL may be 15kHz. For example, in a SL BWP configuration for NR SL, sl_symbin_start may be set to the first SYMBOL (index value 0) in the slot and/or sl_symbin_length may be set to 14. For example, in a resource pool configuration for NR SL, PSFCH resources may not be configured. For example, the boundaries of the TTI for LTE SL and the TTI for NR SL may be aligned. Alternatively, for example, the time difference between the boundaries of the TTI for LTE SL and the TTI for NR SL may be less than or equal to a certain level (e.g., 32 microseconds or equivalent value or CP length).
For example, if the UE performs side chain channel/signaling and/or reception based on different RATs (e.g., LTE and/or NR) in a single carrier or cell, the synchronization source for LTE SL and the synchronization source for NR SL may be the same. For example, the UE may inherit synchronization information (e.g., source and/or DFN0 locations and/or subframes and/or slots and/or symbols and/or frame boundaries, etc.) used for LTE SL operation and use it for NR SL operation. For example, the subframe boundary for LTE SL and the subframe boundary for NR SL may be the same. For example, if the UE performs side link channel/signal transmission and/or reception based on different RATs (e.g., LTE and/or NR) in a single carrier or cell, the synchronization source of the NR SL may be a base station (e.g., eNB), and/or a GNSS, and/or a UE having a GNSS as the synchronization source, and/or a UE having a base station (e.g., eNB) as the synchronization source.
For example, if the UE performs side-link channel/signaling and/or reception in a single carrier or cell based on different RATs (e.g., LTE and/or NR), the UE may apply slot aggregation for NR SL. For example, based on the above-described slot aggregation method, the interval of the time slots of the oligomerization may be aligned with the boundary of the subframes of the LTE SL. More specifically, for example, if SCS of NR SL is 30kHz, NR SL transmission and reception may be performed in the form of aggregation of two slots. For example, if the SCS of the NR SL is 60kHz, NR SL transmission and reception may be performed in the form of an aggregate of four slots. For example, if the SCS of the NR SL is 120kHz, NR SL transmission and reception may be performed in the form of an aggregate of eight slots. For example, the start of an aggregated slot of an NR SL may be aligned with the start of a subframe of an LTE SL. For example, the difference between the start of an aggregated slot of the NR SL and the start of a subframe of the LTE SL may be less than or equal to a certain level (e.g., 32 microseconds or equivalent value or CP length). For example, the UE may perform resource selection from the resource pool by changing the unit of the resource pool selection procedure of the NR SL from the slot to the aggregated slot. For example, the unit of resource selection by the UE in the NR SL may be an aggregated slot. In this case, for example, the UE may use all of the aggregated slots for SL transmission in NR SL operation. For example, the UE may not use all of the aggregated slots for SL transmissions in NR SL operation. For example, the UE may not expect to use only some slots for SL transmission. For example, whether the PSCCH/PSSCH structure and/or PSFCH resources are present may be configured to be the same for all aggregated slots. For example, the start and end symbols for the PSCCH/PSSCH resources may be the same for all aggregated slots. For example, in case of null symbols for a TX-RX switching period in the remaining slots other than the last slot among the aggregated slots, if the UE performs slot aggregation, the UE may perform PSCCH/PSSCH or PSFCH transmission in symbols corresponding to the TX-RX switching period. For example, in symbols corresponding to the TX-RX switching period, the UE may perform transmission by inheriting a mapping of AGC symbols for PSCCH/PSSCH or PSFCH transmission. For example, in symbols corresponding to the TX-RX switching period, the UE may perform transmission by inheriting a mapping of the last symbol actually transmitted by the PSCCH/PSSCH or PSFCH. For example, in a symbol corresponding to a TX-RX switching period, the UE may transmit dummy data. For example, depending on the resource pool configuration for LTE SL, the UE may apply slot aggregation for NR SL only for NR SL overlapping with LTE SL subframes, and the UE may still perform resource selection on the remaining NR SL slot by slot.
Fig. 13 illustrates a method for a UE to apply slot aggregation to NR SL according to an embodiment of the present disclosure. The embodiment of fig. 13 may be combined with various embodiments of the present disclosure.
Referring to fig. 13, the ue may perform slot aggregation for NR SL. In the embodiment of fig. 13, it is assumed that SCS associated with the resource pool for NR SL communication is 30kHz. In this case, the UE intended to perform NR SL communication may perform resource selection by aggregating two slots overlapping one LTE subframe. For example, a UE intended to perform NR SL communication may not be allowed to select only resources included in one slot.
For example, if the UE performs side-chain channel/signaling and/or reception based on different RATs (e.g., LTE and/or NR) in a single carrier or cell, the UE may be limited to include at least the earliest time slot among the NR SL time slots overlapping with the LTE SL subframe when the UE performs resource selection for NR SL transmissions. For example, the NR SL slots subject to resource selection may be NR SL slots that overlap with AGC symbols in an LTE SL subframe (e.g., first symbols in an LTE subframe). For example, the NR SL slot subject to resource selection may be a NR SL slot including an AGC symbol in an LTE SL subframe (e.g., a first symbol in an LTE subframe). For example, the UE may include the remaining NR SL slots overlapping with the LTE SL subframe in the resource selection only when the UE includes the first slot of the NR SL slots overlapping with the LTE SL subframe in the resource selection for the NR SL transmission. For example, if the SCS of the NR SL is 60kHz, there may be four NR SL slots overlapping with the LTE SL subframe, and the UE may include the first time slot of the four NR SL slots, which is temporally earlier, in the resource selection. In this case, if the UE selects the resource in the first slot as the PSCCH/PSSCH transmission resource, the UE may select all or part of the remaining three NR SL slots as the PSCCH/PSSCH transmission resource. On the other hand, if the UE does not select the first slot of the 4 NR SL slots overlapping with the LTE SL subframe as the PSCCH/PSSCH transmission resource, the UE may also exclude the remaining 3 NR SL slots from the PSCCH/PSSCH transmission resource, for example. For example, if the UE selects resources for PSCCH/PSSCH transmission in a first slot of NR SL slots overlapping with an LTE SL subframe, the UE may select the remaining NR SL slots for PSCCH/PSSCH transmission that overlap with the LTE SL subframe by a certain level or higher. For example, the certain level may be (pre) configured for the UE in the form of the number of slots or in the form of a minimum ratio of the number of NR SL slots to be used for transmission and the total number of NR SL slots overlapping with the LTE SL subframe. For example, the UE may apply the above-described resource selection restriction on the NR SL only for the NR SL overlapping with the LTE SL subframe according to the resource pool configuration for the LTE SL, and the UE may perform resource selection on the remaining NR SL without the above-described restriction.
Fig. 14 illustrates a method in which a UE preferentially selects resources included in an earliest slot among NR SL slots overlapping with an LTE SL subframe according to an embodiment of the present disclosure. The embodiment of fig. 14 may be combined with various embodiments of the present disclosure.
Referring to fig. 14, the ue may preferentially select resources included in an earliest slot among NR SL slots overlapping with the LTE SL subframe. In the embodiment of fig. 14, it is assumed that SCS associated with the resource pool for NR SL communication is 30kHz. In this case, the UE may be limited to preferentially select resources included in an earliest slot among NR SL slots overlapping with the LTE SL subframe. In addition, for example, the UE may include the remaining NR SL slots overlapping with the LTE SL subframe in the resource selection only when the UE includes the first slot of the NR SL slots overlapping with the LTE SL subframe in the resource selection for the NR SL transmission.
For example, if the UE performs side link channel/signaling and/or reception based on different RATs (e.g., LTE and/or NR) in a single carrier or cell, the UE performing LTE SL operation may be provided with a configuration for the NR SL operating on the carrier on which the LTE SL is operating (e.g., a configuration for the SL BWP and/or a configuration for the resource pool, etc.). For example, information about slots belonging to a resource pool, and/or TTI information for NR SL operation (e.g., sl_symbin_start and/or sl_symbin_length) may be provided by (pre) configuration or from a base station to a UE performing LTE SL operation. In this case, for example, the UE performing the LTE SL operation may configure a duration or a position for which the AGC operation is to be further performed when the LTE SL is received based on TTI information and resource pool information of the NR SL. For example, if the UE performs side link channel/signaling and/or reception based on different RATs (e.g., LTE and/or NR) in a single carrier or cell, the UE performing NR SL operation may receive a configuration for NR SL operating on the carrier on which the NR SL is operating (including a configuration for subframes belonging to a resource pool) through a (pre) configuration or from a base station.
Meanwhile, when the UE performs the resource selection procedure in the NR SL, if the ratio of the number of available resources to the total number of resources within the resource selection window is less than or equal to (or lower than) X% of the (pre) configuration, the UE may raise the RSRP threshold such that the ratio of available resources is greater than or equal to (or higher than) X%. For example, if the UE performs side link channel/signaling and/or reception based on different RATs (e.g., LTE and/or NR) in a single carrier or cell, and if the UE performs a resource selection procedure, the ratio of available resources may be configured as a ratio of the number of available resources in the first slot of the overlapping LTE SL subframe to the total number of resources in the first slot of the overlapping LTE SL subframe within a resource selection window.
In an embodiment of the present disclosure, the above-described method for alleviating AGC problems when operating SL based on different RATs may be limited to a case in which a frequency domain of LTE SL operation and a frequency domain of NR SL operation overlap or are adjacent to each other to a certain level or less.
In the embodiments of the present disclosure, a case where LTE SL and NR SL operate simultaneously on the same carrier is described, but the technical ideas of the present disclosure can be extended to other RAT-based SL or V2X and NR SL operating simultaneously or NR SL operating simultaneously with different transmission parameters (e.g., SCS and/or subcarrier offset and/or DC position, etc.).
In embodiments of the present disclosure, the resource selection procedure in the NR SL operation may include a resource reselection and/or preemption operation. Alternatively, the UE may operate by selecting different methods for resource selection, resource reselection, and preemption than the above-described embodiments.
Based on various embodiments of the present disclosure, communications based on different RATs can effectively coexist. For example, the UE may preferentially select the earliest NR SL slot among the plurality of NR SL slots overlapping with the LTE SL subframe, thereby preventing the occurrence of the clipping problem described above. In this way, reliability of communications based on different RATs may be ensured.
Fig. 15 illustrates an example in which clipping problems do not occur by preferentially selecting the earliest NR SL slot among a plurality of NR SL slots overlapping with an LTE SL subframe according to an embodiment of the present disclosure. The embodiment of fig. 15 may be combined with various embodiments of the present disclosure.
Referring to fig. 15, if the UE preferentially selects the earliest NR SL slot among the plurality of NR SL slots overlapping with the LTE SL subframe, the receiving UE may perform AGC in consideration of both the LTE SL signal and the NR SL signal. In this case, even if transmission of the NR SL signal is interrupted while the LTE SL signal is transmitted, no clipping problem occurs, and the receiving UE can decode the LTE SL signal and the NR SL signal, respectively. Thus, reliability of communication based on different RATs can be ensured.
Fig. 16 illustrates a method for performing wireless communication by a first device, in accordance with an embodiment of the present disclosure. The embodiment of fig. 16 may be combined with various embodiments of the present disclosure.
Referring to fig. 16, in step S1610, a first device may obtain information related to a first resource pool for Long Term Evolution (LTE) side chain (SL) communication. In step S1620, the first device may obtain information about the second resource pool for NR SL communication. In step S1630, the first device may trigger resource selection in a first time slot. In step S1640, the first device may determine a selection window based on the first slot and a Packet Delay Budget (PDB). In step S1650, the first device may select a first SL resource among the slots belonging to the second resource pool within the selection window based on the sensing. For example, the first SL resource may be a resource included in a time slot overlapping a beginning of a first subframe within the first resource pool in the time domain.
For example, based on selecting a first SL resource that overlaps with the beginning of a first subframe, the first device may be allowed to select a second SL resource that overlaps with the first subframe in the time domain. For example, the second SL resource may be a resource included in a time slot that does not overlap with the start of the first subframe in the time domain.
For example, the first device may not be allowed to select a fourth SL resource that overlaps in the time domain with the second subframe based on not selecting a third SL resource that overlaps in the time domain with the beginning of the second subframe in the first resource pool. For example, the fourth SL resource may be a resource included in a slot that does not overlap with the start of the second subframe in the time domain.
For example, the start of the first subframe may be an initial symbol (first symbol) within the first subframe.
For example, the first SL resource may include a plurality of aggregated SL resources. For example, a beginning of a first SL resource comprising a plurality of aggregated SL resources may be aligned with a beginning of a first subframe, and an end of the first SL resource comprising a plurality of aggregated SL resources may be aligned with an end of the first subframe. For example, a difference between a start of a first SL resource comprising a plurality of aggregated SL resources and a start of a first subframe may be less than or equal to a threshold, and a difference between an end of the first SL resource comprising a plurality of aggregated SL resources and an end of the first subframe may be less than or equal to the threshold.
For example, a Transmission Time Interval (TTI) for LTE SL communication may be the same as a TTI for NR SL communication. For example, the subcarrier spacing (SCS) associated with NR SL communication may be 15kHz and the SL bandwidth portion (BWP) configuration associated with the second resource pool may include SL start symbol information configured to 0 and SL symbol length information configured to 14. For example, a period of physical side link feedback channel (PSFCH) resources within the second resource pool may be configured to be zero.
For example, the synchronization reference for LTE SL communication and the synchronization reference for NR SL communication may be the same.
The proposed method can be applied to devices based on various embodiments of the present disclosure. First, the processor 102 of the first device 100 may obtain information related to a first resource pool for Long Term Evolution (LTE) side chain (SL) communication. In addition, the processor 102 of the first device 100 may obtain information about the second resource pool for NR SL communication. In addition, the processor 102 of the first device 100 may trigger the resource selection in the first time slot. Additionally, the processor 102 of the first device 100 may determine the selection window based on the first time slot and a Packet Delay Budget (PDB). In addition, processor 102 of first device 100 may select the first SL resource among the time slots belonging to the second resource pool within the selection window based on the sensing. For example, the first SL resource may be a resource included in a time slot overlapping a beginning of a first subframe within the first resource pool in the time domain.
Based on embodiments of the present disclosure, a first device adapted to perform wireless communication may be provided. 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: obtaining information related to a first resource pool for Long Term Evolution (LTE) side chain (SL) communication; obtaining information related to a second resource pool for NR SL communication; triggering resource selection in a first time slot; determining a selection window based on the first time slot and a Packet Delay Budget (PDB); and based on the sensing, selecting a first SL resource among the time slots belonging to the second resource pool within the selection window. For example, the first SL resource may be a resource included in a time slot overlapping a beginning of a first subframe within the first resource pool in the time domain.
Based on embodiments of the present disclosure, a processing device adapted to control a first device performing wireless communication may be provided. For example, the processing device 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: obtaining information related to a first resource pool for Long Term Evolution (LTE) side chain (SL) communication; obtaining information related to a second resource pool for NR SL communication; triggering resource selection in a first time slot; determining a selection window based on the first time slot and a Packet Delay Budget (PDB); and based on the sensing, selecting a first SL resource among the time slots belonging to the second resource pool within the selection window. For example, the first SL resource may be a resource included in a time slot overlapping a beginning of a first subframe within the first resource pool in the time domain.
Based on embodiments of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be provided. For example, the instructions, when executed, may cause the first device to: obtaining information related to a first resource pool for Long Term Evolution (LTE) side chain (SL) communication; obtaining information related to a second resource pool for NR SL communication; triggering resource selection in a first time slot; determining a selection window based on the first time slot and a Packet Delay Budget (PDB); and based on the sensing, selecting a first SL resource among the time slots belonging to the second resource pool within the selection window. For example, the first SL resource may be a resource included in a time slot overlapping a beginning of a first subframe within the first resource pool in the time domain.
Fig. 17 illustrates a method for performing wireless communication by a second device, in accordance with an embodiment of the present disclosure. The embodiment of fig. 17 may be combined with various embodiments of the present disclosure.
Referring to fig. 17, in step S1710, the second device may receive first side link control information (SCI) for scheduling second side link control information (SCI) and a physical side link shared channel (PSSCH) from the first device through a physical side link control channel (PSCCH) based on the first Side Link (SL) resource. In step S1720, the second device may receive the second SCI and data from the first device over the PSSCH based on the first SL resource. For example, the first SL resource selected within the second resource pool for NR SL communication may be a resource included in a time slot overlapping with a start of the first subframe within the first resource pool for Long Term Evolution (LTE) SL communication in a time domain.
For example, based on selecting a first SL resource that overlaps with the beginning of a first subframe, the first device may be allowed to select a second SL resource that overlaps with the first subframe in the time domain. For example, the second SL resource may be a resource included in a time slot that does not overlap with the start of the first subframe in the time domain.
For example, the first device may not be allowed to select a fourth SL resource that overlaps in the time domain with the second subframe based on not selecting a third SL resource that overlaps in the time domain with the beginning of the second subframe in the first resource pool. For example, the fourth SL resource may be a resource included in a slot that does not overlap with the start of the second subframe in the time domain.
For example, the start of the first subframe may be an initial symbol (first symbol) within the first subframe.
For example, the first SL resource may include a plurality of aggregated SL resources. For example, a beginning of a first SL resource comprising a plurality of aggregated SL resources may be aligned with a beginning of a first subframe, and an end of the first SL resource comprising a plurality of aggregated SL resources may be aligned with an end of the first subframe. For example, a difference between a start of a first SL resource comprising a plurality of aggregated SL resources and a start of a first subframe may be less than or equal to a threshold, and a difference between an end of the first SL resource comprising a plurality of aggregated SL resources and an end of the first subframe may be less than or equal to the threshold.
For example, a Transmission Time Interval (TTI) for LTE SL communication may be the same as a TTI for NR SL communication. For example, the subcarrier spacing (SCS) associated with NR SL communication may be 15kHz and the SL bandwidth portion (BWP) configuration associated with the second resource pool may include SL start symbol information configured to 0 and SL symbol length information configured to 14. For example, a period of physical side link feedback channel (PSFCH) resources within the second resource pool may be configured to be zero.
For example, the synchronization reference for LTE SL communication and the synchronization reference for NR SL communication may be the same.
The proposed method can be applied to devices based on various embodiments of the present disclosure. First, the processor 202 of the second device 200 may control the transceiver 206 to receive first side link control information (SCI) for scheduling second side link control information (SCI) and physical side link shared channel (PSSCH) from the first device over a physical side link control channel (PSCCH) based on first Side Link (SL) resources. In addition, processor 202 of second device 200 can control transceiver 206 to receive the second SCI and data from the first device over the PSSCH based on the first SL resource. For example, the first SL resource selected within the second resource pool for NR SL communication may be a resource included in a time slot overlapping with a start of the first subframe within the first resource pool for Long Term Evolution (LTE) SL communication in a time domain.
Based on embodiments of the present disclosure, a second device adapted to perform wireless communication may be provided. 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: controlling one or more transceivers to receive first side link control information (SCI) for scheduling second side link control information (SCI) and a physical side link shared channel (PSSCH) from a first device over a physical side link control channel (PSCCH) based on first Side Link (SL) resources; and controlling one or more transceivers to receive the second SCI and data from the first device over the PSSCH based on the first SL resource. For example, the first SL resource selected within the second resource pool for NR SL communication may be a resource included in a time slot overlapping with a start of the first subframe within the first resource pool for Long Term Evolution (LTE) SL communication in a time domain.
Based on embodiments of the present disclosure, a processing device adapted to control a second device performing wireless communication may be provided. For example, the processing device 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: receiving first side link control information (SCI) for scheduling second side link control information (SCI) and a physical side link shared channel (PSSCH) from a first device over a physical side link control channel (PSCCH) based on a first Side Link (SL) resource; and receiving the second SCI and data from the first device over the PSSCH based on the first SL resource. For example, the first SL resource selected within the second resource pool for NR SL communication may be a resource included in a time slot overlapping with a start of the first subframe within the first resource pool for Long Term Evolution (LTE) SL communication in a time domain.
Based on embodiments of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be provided. For example, the instructions, when executed, may cause the second device to: receiving first side link control information (SCI) for scheduling second side link control information (SCI) and a physical side link shared channel (PSSCH) from a first device over a physical side link control channel (PSCCH) based on a first Side Link (SL) resource; and receiving the second SCI and data from the first device over the PSSCH based on the first SL resource. For example, the first SL resource selected within the second resource pool for NR SL communication may be a resource included in a time slot overlapping with a start of the first subframe within the first resource pool for Long Term Evolution (LTE) SL communication in a time domain.
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. 18 shows a communication system (1) according to an embodiment of the present disclosure.
Referring to fig. 18, 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), such as a 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). XR devices may include Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality (MR) devices and may be implemented in the form of head-mounted devices (HMDs), head-up displays (HUDs) installed in vehicles, televisions, smartphones, computers, wearable devices, home appliance devices, digital signage, vehicles, robots, and the like. Handheld devices may include smart phones, smart boards, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., notebooks). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors and smart meters. For example, the BS and network may be implemented as wireless devices, and a particular wireless device (200 a) may operate as a BS/network node relative to other wireless devices.
Here, the wireless communication technology implemented in the wireless apparatuses 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 be connected 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., sidelink 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). IoT devices (e.g., sensors) 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 100 a-100 f/BS200 or BS200/BS 200. Here, the wireless communication/connection may be established through various RATs (e.g., 5 GNRs) such as uplink/downlink communication 150a, secondary 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 through 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. 19 illustrates a wireless device according to an embodiment of the present disclosure.
Referring to fig. 19, 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. 18.
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. 20 illustrates a signal processing circuit for transmitting a signal according to an embodiment of the present disclosure.
Referring to fig. 20, 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. 20 may be performed without limitation to the processor (102, 202) and/or transceiver (106, 206) of fig. 19. The hardware elements of fig. 20 may be implemented by the processor (102, 202) and/or the transceiver (106, 206) of fig. 19. Blocks 1010 through 1060 may be implemented, for example, by the processor (102, 202) of fig. 19. Alternatively, blocks 1010 through 1050 may be implemented by the processor (102, 202) of fig. 19, and block 1060 may be implemented by the transceiver (106, 206) of fig. 19.
The codeword may be converted into a radio signal via the signal processing circuit (1000) of fig. 20. 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. 20. For example, a wireless device (e.g., 100, 200 of fig. 19) 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. 21 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. 18).
Referring to fig. 21, a wireless device (100, 200) may correspond to the wireless device (100, 200) of fig. 19 and may be configured by various elements, assemblies, 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. 19. For example, the transceiver(s) (114) may include one or more transceivers (106, 206) and/or one or more antennas (108, 208) of fig. 19. 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) through the wireless/wired interface via the communication unit (110) in the memory unit (130).
The additional components (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 not limited to, the following forms: robot (100 a of fig. 18), vehicle (100 b-1 and 100b-2 of fig. 18), XR device (100 c of fig. 18), handheld device (100 d of fig. 18), home appliance (100 e of fig. 18), ioT device (100 f of fig. 18), 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. 18), BS (200 of fig. 18), network node, etc. Depending on the use case/service, the wireless device may be used in a mobile or stationary location.
In fig. 21, 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. 21 will be described in detail with reference to the accompanying drawings.
Fig. 22 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. 22, 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. 21.
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 a wired/wireless charging circuit, a battery, 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. 23 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. 23, 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. 21.
The communication unit 110 may transmit and receive signals (e.g., data signals and control signals) to and from external devices such as other vehicles, BSs (e.g., gNB and roadside units), and servers. The control unit 120 may perform various operations by controlling elements of the vehicle or the autonomously driven vehicle 100. The control unit 120 may include an Electronic Control Unit (ECU). The 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, 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 description may be combined to be implemented or performed in a device, and the technical features in the device claims may be combined to be implemented or performed in a method. In addition, the technical features in the method claim(s) and the device claim(s) may be combined to be implemented or performed in the device. 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:
obtaining information related to a first resource pool for Long Term Evolution (LTE) side chain (SL) communication;
obtaining information related to a second resource pool for NR SL communication;
triggering resource selection in a first time slot;
determining a selection window based on the first time slot and a Packet Delay Budget (PDB); and
based on sensing, a first SL resource is selected among time slots belonging to the second resource pool within the selection window,
wherein the first SL resource is a resource included in a time slot overlapping with a start of a first subframe in the first resource pool in a time domain.
2. The method of claim 1, wherein the first device is allowed to select a second SL resource that overlaps the first subframe in the time domain based on the first SL resource overlapping a beginning of the first subframe being selected.
3. The method of claim 2, wherein the second SL resource is a resource included in a time slot that does not overlap with a start of the first subframe in a time domain.
4. The method of claim 1, wherein the first device is not allowed to select a fourth SL resource that overlaps in time domain with a second subframe within the first pool of resources based on a third SL resource that does not overlap in time domain with a beginning of the second subframe.
5. The method of claim 4, wherein the fourth SL resource is a resource included in a time slot that does not overlap with a start of the second subframe in a time domain.
6. The method of claim 1, wherein a beginning of the first subframe is an initial symbol within the first subframe.
7. The method of claim 1, wherein the first SL resource comprises a plurality of aggregated SL resources.
8. The method of claim 7, wherein a beginning of the first SL resource comprising the plurality of aggregated SL resources is aligned with a beginning of the first subframe and an end of the first SL resource comprising the plurality of aggregated SL resources is aligned with an end of the first subframe.
9. The method of claim 7, wherein a difference between a start of the first SL resource comprising the plurality of aggregated SL resources and a start of the first subframe is less than or equal to a threshold, and a difference between an end of the first subframe comprising the plurality of aggregated SL resources and an end of the first subframe is less than or equal to the threshold.
10. The method of claim 1, wherein a Transmission Time Interval (TTI) for the LTE SL communication is the same as a TTI for the NR SL communication.
11. The method of claim 10 wherein a subcarrier spacing (SCS) associated with the NR SL communication is 15kHz and
wherein a SL bandwidth part (BWP) configuration associated with the second resource pool includes SL start symbol information configured to 0 and SL symbol length information configured to 14.
12. The method of claim 10, wherein a period of physical side link feedback channel (PSFCH) resources within the second resource pool is configured to be zero.
13. The method of claim 1, wherein a synchronization reference for the LTE SL communication and a synchronization reference for the NR SL communication are the same.
14. A first device adapted to perform wireless communication, 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:
obtaining information related to a first resource pool for Long Term Evolution (LTE) side chain (SL) communication;
obtaining information related to a second resource pool for NR SL communication;
triggering resource selection in a first time slot;
determining a selection window based on the first time slot and a Packet Delay Budget (PDB); and is also provided with
Based on sensing, a first SL resource is selected among time slots belonging to the second resource pool within the selection window,
wherein the first SL resource is a resource included in a time slot overlapping with a start of a first subframe in the first resource pool in a time domain.
15. A processing device adapted to control a first device performing wireless communication, the processing device 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:
Obtaining information related to a first resource pool for Long Term Evolution (LTE) side chain (SL) communication;
obtaining information related to a second resource pool for NR SL communication;
triggering resource selection in a first time slot;
determining a selection window based on the first time slot and a Packet Delay Budget (PDB); and is also provided with
Based on sensing, a first SL resource is selected among time slots belonging to the second resource pool within the selection window,
wherein the first SL resource is a resource included in a time slot overlapping with a start of a first subframe in the first resource pool in a time domain.
16. A non-transitory computer-readable storage medium storing instructions that, when executed, cause a first device to:
obtaining information related to a first resource pool for Long Term Evolution (LTE) side chain (SL) communication;
obtaining information related to a second resource pool for NR SL communication;
triggering resource selection in a first time slot;
determining a selection window based on the first time slot and a Packet Delay Budget (PDB); and is also provided with
Based on sensing, a first SL resource is selected among time slots belonging to the second resource pool within the selection window,
wherein the first SL resource is a resource included in a time slot overlapping with a start of a first subframe in the first resource pool in a time domain.
17. A method for performing wireless communication by a second device, the method comprising:
receiving first side link control information (SCI) for scheduling second side link control information (SCI) and a physical side link shared channel (PSSCH) from a first device over a physical side link control channel (PSCCH) based on first Side Link (SL) resources; and
receiving the second SCI and data from the first device over the PSSCH based on the first SL resource,
wherein the first SL resource selected within the second resource pool for NR SL communication is a resource included in a time slot overlapping with a start of a first subframe within the first resource pool for Long Term Evolution (LTE) SL communication in a time domain.
18. A second device adapted to perform wireless communication, 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:
controlling the one or more transceivers to receive first side link control information (SCI) for scheduling second side link control information (SCI) and a physical side link shared channel (PSSCH) from a first device over a physical side link control channel (PSCCH) based on first Side Link (SL) resources; and is also provided with
Controlling the one or more transceivers to receive the second SCI and data from the first device over the PSSCH based on the first SL resource,
wherein the first SL resource selected within the second resource pool for NR SL communication is a resource included in a time slot overlapping with a start of a first subframe within the first resource pool for Long Term Evolution (LTE) SL communication in a time domain.
19. A processing device adapted to control a second device performing wireless communication, the processing device 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:
receiving first side link control information (SCI) for scheduling second side link control information (SCI) and a physical side link shared channel (PSSCH) from a first device over a physical side link control channel (PSCCH) based on a first Side Link (SL) resource; and is also provided with
Receiving the second SCI and data from the first device over the PSSCH based on the first SL resource,
wherein the first SL resource selected within the second resource pool for NR SL communication is a resource included in a time slot overlapping with a start of a first subframe within the first resource pool for Long Term Evolution (LTE) SL communication in a time domain.
20. A non-transitory computer-readable storage medium storing instructions that, when executed, cause a second device to:
receiving first side link control information (SCI) for scheduling second side link control information (SCI) and a physical side link shared channel (PSSCH) from a first device over a physical side link control channel (PSCCH) based on a first Side Link (SL) resource; and is also provided with
Receiving the second SCI and data from the first device over the PSSCH based on the first SL resource,
wherein the first SL resource selected within the second resource pool for NR SL communication is a resource included in a time slot overlapping with a start of a first subframe within the first resource pool for Long Term Evolution (LTE) SL communication in a time domain.
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| KR10-2021-0078329 | 2021-06-16 | ||
| KR20210078869 | 2021-06-17 | ||
| KR10-2021-0078869 | 2021-06-17 | ||
| PCT/KR2022/008467 WO2022265388A1 (en) | 2021-06-16 | 2022-06-15 | Method and apparatus for coexistence of sl communications based on different rats in nr v2x |
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| CN117480844A true CN117480844A (en) | 2024-01-30 |
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