WO2024074020A1 - Procédés et appareils d'établissement de rapport de csi de liaison latérale sur des spectres sans licence - Google Patents

Procédés et appareils d'établissement de rapport de csi de liaison latérale sur des spectres sans licence Download PDF

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Publication number
WO2024074020A1
WO2024074020A1 PCT/CN2023/085774 CN2023085774W WO2024074020A1 WO 2024074020 A1 WO2024074020 A1 WO 2024074020A1 CN 2023085774 W CN2023085774 W CN 2023085774W WO 2024074020 A1 WO2024074020 A1 WO 2024074020A1
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WIPO (PCT)
Prior art keywords
transmission
csi
slot
cot
csi report
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PCT/CN2023/085774
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English (en)
Inventor
Xin Guo
Haipeng Lei
Zhennian SUN
Xiaodong Yu
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Lenovo (Beijing) Limited
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Priority to PCT/CN2023/085774 priority Critical patent/WO2024074020A1/fr
Publication of WO2024074020A1 publication Critical patent/WO2024074020A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • Embodiments of the present application are related to wireless communication technologies, and more particularly, related to methods and apparatuses for sidelink (SL) channel state information (CSI) reporting over unlicensed spectra.
  • SL sidelink
  • CSI channel state information
  • a sidelink is a long-term evolution (LTE) feature introduced in 3 rd generation partnership project (3GPP) Release 12, and enables a direct communication between proximal user equipments (UEs) , in which data does not need to go through a base station (BS) or a core network.
  • LTE long-term evolution
  • 3GPP 3 rd generation partnership project
  • a sidelink communication system has been introduced into 3GPP 5G wireless communication technology, in which a direct link between two UEs is called a sidelink.
  • SL CSI framework is introduced to unicast communication. How to support SL CSI reporting over unlicensed spectra needs to be discussed.
  • Embodiments of the present application at least provide a technical solution for SL CSI reporting over unlicensed spectra.
  • a first UE may include: a transceiver; and a processor coupled to the transceiver and configured to cause the first UE to: make a determination on how to transmit information associated with a first transmission at least including an SL CSI request and SL CSI reference signal (CSI-RS) according to one of the following cases: a first case where the first transmission is assembled to start from a first starting symbol of two starting symbols in a slot; or a second case where the first transmission is to be transmitted in a slot within a channel occupancy time (COT) initiated for sidelink transmission; and perform operations based on the determination related to the first transmission.
  • CSI-RS SL CSI request and SL CSI reference signal
  • the processor in response to determining that resource (s) available for transmission starts from a second starting symbol of the two starting symbols in the slot, the processor is configured to cause the first UE to perform one of the following operations: dropping the first transmission; puncturing the first transmission to obtain a second transmission including first one or more symbols of the first transmission such that the second transmission starts from the second starting symbol of the two starting symbols in the slot, and transmitting the second transmission instead of the first transmission; in the case that a processing delay permits, re-assembling a third transmission including the SL CSI request and SL CSI-RS such that the third transmission starts from the second starting symbol of the two starting symbols in the slot, and transmitting the third transmission instead of the first transmission; or in the case that a COT is initiated for the first transmission: puncturing the first transmission to obtain a second transmission including first one or more symbols of the first transmission such that the second transmission starts from the second starting symbol of the two starting symbols in the slot; transmitting the second transmission instead of the first transmission; and transmitting
  • the processor is configured to cause the first UE to determine whether an SL CSI report associated with the first transmission is to be transmitted within the COT.
  • the processor is configured to cause the first UE to transmit, to a second UE, a first indicator indicating whether the SL CSI report is to be transmitted within the COT, wherein the indicator is carried in the first transmission.
  • the processor in response to determining that the SL CSI report is to be transmitted within the COT, is further configured to cause the first UE to transmit, to a second UE, COT sharing information for transmitting the SL CSI report.
  • the processor is further configured to cause the first UE to receive, from a second UE, an SL CSI report in a 2 nd -stage sidelink control information (SCI) .
  • SCI sidelink control information
  • the processor is further configured to cause the first UE to receive a second indicator from the second UE in SCI, wherein the second indicator indicates whether data is included in a physical sidelink shared channel (PSSCH) transmission associated with the SL CSI report.
  • PSSCH physical sidelink shared channel
  • the processor is further configured to cause the first UE to receive a third indicator in a 1 st -stage SCI, wherein the third indicator indicates a format of the 2 nd -stage SCI including the SL CSI report.
  • a second UE may include: a transceiver; and a processor coupled to the transceiver and configured to cause the second UE to: make a determination on how to transmit information associated with an SL CSI report according to one of the following cases: a first case where the second UE receives a transmission which starts from a second starting symbol of two starting symbols in a slot, wherein the transmission at least includes an SL CSI request associated with the SL CSI report; a second case where the second UE receives a transmission in a slot within a COT initiated for sidelink transmission, wherein the transmission at least includes an SL CSI request associated with the SL CSI report; or a third case where the SL CSI report is to be transmitted in a 2 nd -stage SCI; and transmit the information associated with the SL CSI report based on the determination.
  • the processor is further configured to cause the second UE to perform the following operations: determining whether SL CSI-RS is included in the transmission; in response to determining that the SL CSI-RS is included in the transmission, deriving CSI from the SL CSI-RS, and transmitting, to a first UE which transmits the transmission, the SL CSI report based on a CSI reporting configuration; or in response to determining that the SL CSI-RS is not included in the transmission, transmitting, to the first UE which transmits the transmission, a first indicator indicating that a reception of SL CSI-RS is failed.
  • the processor is further configured to cause the second UE to receive, from a first UE which transmits the transmission, a second indicator indicating whether to transmit the SL CSI report within the COT, wherein the second indicator is carried in the transmission.
  • the processor is configured to cause the second UE to transmit the SL CSI report based on the second indicator and information of the COT.
  • the processor is further configured to cause the second UE to transmit a third indicator in SCI, wherein the third indicator indicates whether data is included in a PSSCH transmission associated with the SL CSI report.
  • the processor is further configured to cause the second UE to transmit a fourth indicator in a 1 st -stage SCI, wherein the fourth indicator indicates a format of the 2 nd -stage SCI including the SL CSI report.
  • a method performed by a first UE may include: making a determination on how to transmit information associated with a first transmission at least including an SL CSI request and SL CSI-RS according to one of the following cases: a first case where the first transmission is assembled to start from a first starting symbol of two starting symbols in a slot; or a second case where the first transmission is to be transmitted in a slot within a COT initiated for sidelink transmission; and performing operations based on the determination related to the first transmission.
  • a method performed by a second UE may include: making a determination on how to transmit information associated with an SL CSI report according to one of the following cases: a first case where the second UE receives a transmission which starts from a second starting symbol of two starting symbols in a slot, wherein the transmission at least includes an SL CSI request associated with the SL CSI report; a second case where the second UE receives a transmission in a slot within a COT initiated for sidelink transmission, wherein the transmission at least includes an SL CSI request associated with the SL CSI report; or a third case where the SL CSI report is to be transmitted in a 2 nd -stage SCI; and transmitting the information associated with the SL CSI report based on the determination.
  • FIG. 1 is a schematic diagram illustrating an exemplary wireless communication system according to some embodiments of the present application
  • FIGS. 2A and 2B illustrate two exemplary sidelink slot structures according to some embodiments of the present application
  • FIG. 3 illustrates a flowchart of an exemplary method for SL CSI reporting over unlicensed spectra according to some embodiments of the present application
  • FIG. 4 illustrates an exemplary puncturing operation to obtain a transmission starting from a second starting symbol in a slot according to some embodiments of the present application
  • FIG. 5 illustrates a flowchart of an exemplary method for SL CSI reporting over unlicensed spectra according to some other embodiments of the present application
  • FIG. 6 illustrates a flowchart of an exemplary method for SL CSI reporting over unlicensed spectra according to some embodiments of the present application
  • FIG. 7 illustrates a flowchart of an exemplary method for SL CSI reporting over unlicensed spectra according to some other embodiments of the present application
  • FIG. 8 illustrates a flowchart of an exemplary method for SL CSI reporting over unlicensed spectra according to some embodiments of the present application.
  • FIG. 9 illustrates a simplified block diagram of an exemplary apparatus for SL CSI reporting over unlicensed spectra according to some embodiments of the present application.
  • FIG. 1 illustrates an exemplary wireless communication system 100 in accordance with some embodiments of the present application.
  • the wireless communication system 100 includes at least one UE 101 and at least one BS 102.
  • the wireless communication system 100 includes two UEs 101 (e.g., UE 101a and UE 101b) and one BS 102 for illustrative purpose.
  • UE 101a and UE 101b e.g., UE 101a and UE 101b
  • BS 102 e.g., a specific number of UEs 101 and BS 102 are depicted in FIG. 1, it is contemplated that any number of UEs 101 and BSs 102 may be included in the wireless communication system 100.
  • the UE (s) 101 may include computing devices, such as desktop computers, laptop computers, personal digital assistants (PDAs) , tablet computers, smart televisions (e.g., televisions connected to the Internet) , set-top boxes, game consoles, security systems (including security cameras) , vehicle on-board computers, network devices (e.g., routers, switches, and modems) , or the like.
  • computing devices such as desktop computers, laptop computers, personal digital assistants (PDAs) , tablet computers, smart televisions (e.g., televisions connected to the Internet) , set-top boxes, game consoles, security systems (including security cameras) , vehicle on-board computers, network devices (e.g., routers, switches, and modems) , or the like.
  • the UE (s) 101 may include a portable wireless communication device, a smart phone, a cellular telephone, a flip phone, a device having a subscriber identity module, a personal computer, a selective call receiver, or any other device that is capable of sending and receiving communication signals on a wireless network.
  • the UE (s) 101 may include wearable devices, such as smart watches, fitness bands, optical head-mounted displays, or the like.
  • the UE (s) 101 may include vehicle UEs (VUEs) and/or power-saving UEs (also referred to as power sensitive UEs) .
  • the power-saving UEs may include vulnerable road users (VRUs) , public safety UEs (PS-UEs) , and/or commercial sidelink UEs (CS-UEs) that are sensitive to power consumption.
  • a VRU may include a pedestrian UE (P-UE) , a cyclist UE, a wheelchair UE or other UEs which require power saving compared with a VUE.
  • the UE (s) 101 may be referred to as a subscriber unit, a mobile, a mobile station, a user, a terminal, a mobile terminal, a wireless terminal, a fixed terminal, a subscriber station, a user terminal, or a device, or described using other terminology used in the art.
  • a transmission UE may also be named as a transmitting UE, a transmitter UE, a Tx UE, a sidelink Tx UE, a sidelink transmission UE, or the like.
  • a reception UE may also be named as a receiving UE, a receiver UE, an Rx UE, a sidelink Rx UE, a sidelink reception UE, or the like.
  • UE 101a functions as a Tx UE
  • UE 101b functions as an Rx UE.
  • UE 101a may exchange sidelink messages with UE 101b through a sidelink, for example, via PC5 interface as defined in 3GPP TS 23.303.
  • UE 101a may transmit information or data to other UE (s) within the sidelink communication system, through sidelink unicast, sidelink groupcast, or sidelink broadcast.
  • UE 101a may transmit data to UE 101b in a sidelink unicast session.
  • UE 101a may transmit data to UE 101b and other UE (s) in a groupcast group (not shown in FIG. 1) by a sidelink groupcast transmission session.
  • UE 101a may transmit data to UE 101b and other UE (s) (not shown in FIG. 1) by a sidelink broadcast transmission session.
  • UE 101b functions as a Tx UE and transmits sidelink messages
  • UE 101a functions as an Rx UE and receives the sidelink messages from UE 101b.
  • UE 101a may communicate with UE 101b over licensed spectrums, whereas in other embodiments, UE 101a may communicate with UE 101b over unlicensed spectrums.
  • Both UE 101a and UE 101b in the embodiments of FIG. 1 may transmit information to BS 102 and receive control information from BS 102, for example, via LTE or NR Uu interface.
  • BS 102 may be distributed over a geographic region.
  • BS 102 may also be referred to as an access point, an access terminal, a base, a base unit, a macro cell, a Node-B, an evolved Node B (eNB) , a generalized Node B (gNB) , a Home Node-B, a relay node, or a device, or described using other terminology used in the art.
  • BS 102 is generally a part of a radio access network that may include one or more controllers communicably coupled to BS 102.
  • the wireless communication system 100 may be compatible with any type of network that is capable of sending and receiving wireless communication signals.
  • the wireless communication system 100 is compatible with a wireless communication network, a cellular telephone network, a time division multiple access (TDMA) based network, a code division multiple access (CDMA) based network, an orthogonal frequency division multiple access (OFDMA) based network, an LTE network, a 3GPP-based network, a 3GPP 5G network, a satellite communications network, a high-altitude platform network, and/or other communications networks.
  • TDMA time division multiple access
  • CDMA code division multiple access
  • OFDMA orthogonal frequency division multiple access
  • the wireless communication system 100 is compatible with the 5G NR of the 3GPP protocol, wherein BS (s) 102 transmit data using an orthogonal frequency division multiplexing (OFDM) modulation scheme on the downlink (DL) and UE (s) 101 transmit data on the uplink (UL) using a discrete Fourier transform-spread-orthogonal frequency division multiplexing (DFT-S-OFDM) or cyclic prefix-OFDM (CP-OFDM) scheme. More generally, however, the wireless communication system 100 may implement some other open or proprietary communication protocols, for example, WiMAX, among other protocols.
  • OFDM orthogonal frequency division multiplexing
  • CP-OFDM cyclic prefix-OFDM
  • BS (s) 102 may communicate using other communication protocols, such as the IEEE 802.11 family of wireless communication protocols. Further, in some embodiments of the present disclosure, BS(s) 102 may communicate over licensed spectrums, whereas in other embodiments, BS(s) 102 may communicate over unlicensed spectrums. The present disclosure is not intended to be limited to the implementation of any particular wireless communication system architecture or protocol. In yet some embodiments of the present disclosure, BS (s) 102 may communicate with UE (s) 101 using the 3GPP 5G protocols.
  • NR accommodating multiple uncoordinated UEs in an unlicensed spectrum requires channel access procedures defined for NR. Following a successful channel access procedure performed by a communicating node, the channel can be used by the communicating node during a period until the end of the period. Such a period may be referred to as a COT. During a COT, one or more transmissions may be exchanged between the communicating nodes, wherein a transmission may be a downlink transmission or an uplink transmission.
  • Dynamic channel access procedures are usually used by a BS or a UE to access a channel in an unlicensed spectrum. Dynamic channel access procedures may be based on listen-before-talk (LBT) , where a transmitter listens to potential transmission activity on a channel prior to transmitting and applies a random back-off time in some cases.
  • LBT listen-before-talk
  • Two main types of dynamic channel access procedures may be defined in NR. One is Type-1 dynamic channel access procedure, which is also referred to as LBT type 1 or LBT cat4. The other is Type-2 dynamic channel access procedure, which is also referred to as LBT type 2.
  • Type-1 dynamic channel access procedure may be used to initiate data transmission at the beginning of a COT.
  • the initiator for the Type-1 dynamic channel access procedure may be either a BS or a UE.
  • the Type-1 dynamic channel access procedure may be summarized as follows.
  • the initiator listens and waits until a channel (e.g., a frequency channel) is available during at least one period referred to as a defer duration.
  • the defer duration may consist of 16 ⁇ s and a number (e.g., "m p " in the following Table 1 or Table 2, which will be illustrated below) of 9 ⁇ s slots.
  • m p a number of 9 ⁇ s slots.
  • a value of "m p " depends on a value of CAPC (represented as "p" ) .
  • the defer duration depends on the value of CAPC as shown in the following Table 1 or Table 2.
  • a channel is declared to be available if the received energy during at least 4 ⁇ s of each 9 ⁇ s slot is below a threshold.
  • the transmitter starts a random back-off procedure during which it will wait a random period of time.
  • the UE starts the random back-off procedure by initializing a back-off timer with a random number within a contention window (CW) .
  • the random number is drawn from a uniform distribution [0, CW] and represents that the channel must be available for a timer duration (e.g., defined by the random number multiplying 9 ⁇ s) before transmission can take place.
  • the value of "CW” may be selected from "allowed CW p sizes" (the minimum value is represented as CW min, p , and the maximum value is represented as CW max, p ) in the following Table 1 or Table 2, which depends on a value of CAPC.
  • the back-off timer is decreased by one for each sensing slot duration (e.g., 9 ⁇ s) the channel is sensed to be idle; whenever the channel is sensed to be busy, the back-off timer is put on hold until the channel has been idle for a defer duration.
  • the back-off timer has expired (e.g., the back-off timer is decreased to be 0)
  • the random back-off procedure is completed, and the transmitter has acquired the channel and can use it for transmission up to a maximum channel occupancy time (MCOT) (e.g., T mcot, p in the following Table 1 or T ulmcot, p in the following Table 2, which depends on a value of CAPC) .
  • MCOT maximum channel occupancy time
  • Table 1 and Table 2 illustrate exemplary CAPC for DL and CAPC for UL, respectively, and corresponding values of m p , CW min, p , CW max, p , T mcot, p , T ulmcot, p , and allowed CW p sizes.
  • Table 1 is the same as Table 4.1.1-1 in TS 37.213 and Table 2 is the same as Table 4.2.1-1 in TS 37.213.
  • a BS When a BS intends to initiate a channel occupancy for DL transmission, it may determine a CAPC value before performing a Type-1 channel access procedure, and then determine the corresponding values (e.g., m p , CW min, p , CW max, p , T mcot, p , and allowed CW p sizes) used in the Type-1 channel access procedure according to Table 1.
  • a CAPC value e.g., m p , CW min, p , CW max, p , T mcot, p , and allowed CW p sizes
  • a UE When a UE intends to initiate a channel occupancy for UL transmission, it may determine a CAPC value before performing a Type-1 channel access procedure, and then determine the corresponding values (e.g., m p , CW min, p , CW max, p , T ulmcot, p , and allowed CW p sizes) used in the Type-1 channel access procedure according to Table 2.
  • a CAPC value e.g., m p , CW min, p , CW max, p , T ulmcot, p , and allowed CW p sizes
  • Table 2 Channel Access Priority Class for UL
  • HARQ hybrid automatic repeat request
  • Type-2 dynamic channel access procedure may be used for COT sharing and transmission of discovery bursts.
  • Type-2 dynamic channel access procedure may be further classified into the following three procedures, wherein which procedure to be used may be determined depending on the duration of the gap between two transmission bursts.
  • Type 2A dynamic channel access procedure also referred to as LBT cat2 or LBT type 2A: which is used when the gap is 25 ⁇ s or more for transmission of the discovery bursts.
  • Type 2B dynamic channel access procedure (also referred to as LBT type 2B) : which is used when the gap is 16 ⁇ s.
  • Type 2C dynamic channel access procedure (also referred to as LBT type 2C) : which is used when the gap is 16 ⁇ s or less after the preceding transmission burst.
  • Type 2C dynamic channel access procedure no idle sensing is required between the transmission bursts.
  • the duration of a transmission burst is limited to at most 584 ⁇ s.
  • Such a short transmission burst may carry small amount of user data, uplink control information (UCI) such as HARQ status reports and CSI reports.
  • UCI uplink control information
  • Type 2A dynamic channel access procedure and Type 2B dynamic channel access procedure may be similar to Type-1 dynamic channel access procedure but without the random back-off. That is, in Type 2A dynamic channel access procedure and Type 2B dynamic channel access procedure, if a channel is detected to be idle in the gap, it is declared to be available; if it is detected to be busy, the COT sharing has failed and the transmission cannot occur using COT sharing in this COT. If the COT sharing gap is 16 ⁇ s, Type 2B dynamic channel access procedure may be used and the channel must be detected to be idle in the 16 ⁇ s gap prior to the next transmission burst. If the COT sharing gap is 25 ⁇ s or longer, Type 2A dynamic channel access procedure may be used and the channel must be detected to be idle during at least 25 ⁇ s immediately preceding the next transmission burst.
  • the above embodiments provide several dynamic channel access procedures in an unlicensed spectrum for NR. These dynamic channel access procedures may also apply for sidelink transmissions in an unlicensed spectrum.
  • SL CSI framework is introduced to unicast communication where a Tx UE transmits SL CSI-RS to an Rx UE so that the Rx UE can measure or derive CSI based on the SL CSI-RS and report it back to the Tx UE via an SL CSI report, which may be carried within a PSSCH transmission. Based on the fed back CSI, the Tx UE may adjust its transmission.
  • SL CSI-RS may be transmitted in a PSSCH of a slot.
  • the design of the SL CSI-RS may be based on the CSI-RS design of Release 15 NR Uu.
  • the resource mapping of SL CSI-RS in a physical RB (PRB) may be based on the CSI-RS resource mapping patterns in NR Uu, which support up to two antenna ports (because in NR vehicle-to-everything (V2X) SL, up to two streams can be supported in a PSSCH) .
  • Each PRB within the PSSCH uses the same pattern for the SL CSI-RS.
  • the SL CSI-RS is not transmitted on symbols containing physical sidelink control channel (PSCCH) , the 2 nd -stage SCI or PSSCH demodulation reference signal (DMRS) .
  • the SL CSI-RS configuration includes a resource mapping pattern and the number of antenna ports for SL CSI-RS.
  • the SL CSI-RS configuration may be selected by the Tx UE and provided to the Rx UE via PC5 radio resource control (RRC) signaling.
  • RRC radio resource control
  • the Tx UE may configure aperiodic CSI reporting from the Rx UE.
  • the Tx UE may transmit a one-bit CSI request in the 2 nd -stage SCI along with SL CSI-RS to the Rx UE of a unicast link, so as to trigger the Rx UE to feed back an SL CSI report.
  • the Rx UE may measure or derive CSI based on the SL CSI-RS transmitted by the Tx UE and feed back the CSI to the Tx UE. To avoid outdated CSI, the Rx UE is expected to feed back the CSI within a maximum amount of time.
  • a latency bound This maximum amount of time may be referred to as a latency bound, which may be determined by the Tx UE and provided to the Rx UE via PC5-RRC signaling.
  • the Rx UE may feed back the CSI to the Tx UE via an SL CSI report.
  • the SL CSI report may be carried in a medium access control (MAC) control element (CE) over a PSSCH sent from the Rx UE to the Tx UE. It is expected that the Rx UE feeds back the SL CSI report within the latency bound.
  • MAC medium access control
  • CE control element
  • the CSI may include a channel quality indicator (CQI) and a rank indicator (RI) .
  • CQI channel quality indicator
  • RI rank indicator
  • PMI pre-coding matrix indication
  • open-loop multi-antenna SL transmissions instead of closed-loop multi-antenna SL transmissions, may be performed by the Tx UE based on the CQI and RI fed back by the Rx UE.
  • CQI may be selected from a CQI table that is derived based on the configured modulation and coding scheme (MCS) table for a PSSCH.
  • CQI provides an indication of the highest MCS that can be supported by the SL channel measured at the Rx UE.
  • CQI may be used for such as link adaptation adjusting the MCS for a transmission.
  • the Rx UE may determine the RI that corresponds to the rank of the measured SL channel.
  • the rank of a channel may determine the number of streams that can be supported by the channel.
  • the RI may be equal to 1 or 2.
  • RI may be used for such as rank adaptation adjusting the number of streams that can be sent in a PSSCH with a multi-antenna transmission.
  • SL CSI reporting over unlicensed spectra may involve some issues. These issues may be caused by the features in unlicensed spectra and will be described in detail later.
  • Embodiments of the present application provide solutions for SL CSI reporting over unlicensed spectra. For example, embodiments of the present application provide several solutions regarding configurations, signaling, UE behaviors, and procedures for transmitting CSI request, CSI-RS, and CSI report over unlicensed spectra, which can solve the issues caused by the features in unlicensed spectra. More details will be described in the following text in combination with the appended drawings.
  • FIGS. 2A and 2B illustrate two exemplary sidelink slot structures according to some embodiments of the present application.
  • FIG. 2A One slot including 14 OFDM symbols (also referred to as symbols) in total, e.g., OFDM symbol #0 to OFDM symbol #13, is illustrated in FIG. 2A.
  • the OFDM symbols available for sidelink transmission in the slot include all the 14 OFDM symbols.
  • FIG. 2A illustrates an exemplary slot with 14 sidelink symbols available.
  • the sidelink slot is configured with three-symbol PSCCH.
  • OFDM symbol #0 is used for automatic gain control (AGC) by repeating the first OFDM symbol (e.g., OFDM symbol #1) carrying DMRS and PSCCH transmissions.
  • OFDM symbol #2 and OFDM symbol #3 are used to carry PSSCH and PSCCH transmissions.
  • OFDM symbol #4, OFDM symbol #7, and OFDM symbol #10 are used to carry DMRS.
  • OFDM symbol #5, OFDM symbol #6, OFDM symbol #8, OFDM symbol #9, OFDM symbol #11, and OFDM symbol #12 are used to carry PSSCH transmissions.
  • the last available OFDM symbol e.g., OFDM symbol #13, is used as a guard symbol (e.g., a gap) .
  • the last available OFDM symbol may be not used as the guard symbol, but is used to carry a PSSCH transmission or used for performing a channel access procedure.
  • FIG. 2B One slot including 14 OFDM symbols in total is illustrated in FIG. 2B, where the OFDM symbols available for sidelink transmission in the slot include 13 OFDM symbols (e.g., OFDM symbol #0 to OFDM symbol #12) .
  • FIG. 2B illustrates an exemplary slot with 13 sidelink symbols available.
  • the sidelink slot is configured with two-symbol PSCCH.
  • OFDM symbol #0 is used for AGC by repeating the first OFDM symbol (e.g., OFDM symbol #1) carrying PSCCH and PSSCH transmissions.
  • OFDM symbol #2 is used to carry PSSCH and PSCCH transmissions.
  • OFDM symbol #3 and OFDM symbol #10 are used to carry DMRS.
  • OFDM symbols #4-#9 and OFDM symbol #11 are used to carry PSSCH transmissions.
  • the last available OFDM symbol e.g., OFDM symbol #12
  • is used as a guard symbol e.g., a gap
  • the last available OFDM symbol is not used as the guard symbol, but is used to carry a PSSCH transmission or used for performing a channel access procedure.
  • SL CSI-RS is not transmitted on symbols containing PSCCH, the 2 nd -stage SCI or PSSCH DMRS. Then, in the example of FIG. 2A, the first symbol available for transmitting SL CSI-RS is the sixth symbol (e.g., symbol #5) . In the example of FIG. 2B, the first symbol available for transmitting SL CSI-RS is the fifth symbol (e.g., symbol #4) .
  • two starting symbols may be supported in a slot for an SL transmission (e.g., including at least one of PSCCH transmission or PSSCH transmission) over an unlicensed spectrum.
  • the two starting symbols may be referred to as a first starting symbol and a second starting symbol, respectively, where the first starting symbol is prior to the second starting symbol.
  • the flexible slot structure where SL transmissions are not constrained to the slot boundaries, is beneficial as it can reduce the delay from a successful channel access procedure to an SL transmission.
  • SL transmission can be started only after a successful channel access procedure by a UE.
  • the UE may transmit the SL transmission from the second starting symbol after a successful channel access procedure. That is, resource (s) available for the SL transmission starts from the second starting symbol of the two starting symbols in the slot. Due to extremely limited processing time, the SL transmission may not be re-assembled in some cases.
  • the SL transmission includes SL CSI request and SL CSI-RS
  • the SL CSI request is successfully transmitted within the slot but the SL CSI-RS is not transmitted within the slot or only a part of the CSI-RS is transmitted within the slot.
  • the CSI reporting is triggered by the SL CSI request, but the CSI cannot be derived due to not receiving CSI-RS completely. In such cases, how to avoid the ambiguity needs to be solved.
  • FIG. 3 illustrates a flowchart of an exemplary method 300 for SL CSI reporting over unlicensed spectra according to some embodiments of the present application.
  • the method 300 illustrated in FIG. 3 may be performed by a first UE which transmits SL CSI-RS (also referred to as a CSI triggering UE) .
  • SL CSI-RS also referred to as a CSI triggering UE
  • two starting symbols are supported in a slot for transmitting a first transmission.
  • the first transmission may at least include an SL CSI request and SL CSI-RS.
  • the first transmission may be assembled to start from the first starting symbol of the two starting symbols in the slot and end at an ending symbol as specified in 3GPP standard documents.
  • the ending symbol of the first transmission may be the ending symbol of the slot. In some other embodiments, the ending symbol of the first transmission may be other symbol in the slot.
  • the slot may have a structure as illustrated in FIG. 2A or 2B or any other structure.
  • the first starting symbol of the two starting symbols may be configured, pre-configured, or pre-defined to UE (s) from a first set of symbols in the slot, e.g., ⁇ symbol #0, symbol #1, symbol #2, symbol #3, symbol #4, symbol #5, symbol #6 ⁇ .
  • the second starting symbol of the two starting symbols may be configured, pre-configured, or pre-defined to UE (s) from a second set of symbols in the slot, e.g., ⁇ symbol #3, symbol #4, symbol #5, symbol #6, symbol #7 ⁇ .
  • the UE (s) may at least include the first UE and a second UE which transmits SL CSI report (s) (also referred to as a CSI reporting UE) .
  • Configuring a starting symbol (e.g., the first starting symbol or the second starting symbol) to a UE may refer to that configuration information indicating the starting symbol is transmitted by a BS to the UE via at least one of: a system information block (SIB) message, a master information block (MIB) message, an RRC signaling, a MAC CE, or downlink control information (DCI) , such that the UE may receive the configuration information indicating the starting symbol from the BS.
  • SIB system information block
  • MIB master information block
  • DCI downlink control information
  • Pre-configuring or pre-defining a starting symbol (e.g., the first starting symbol or the second starting symbol) to the UE may refer to that: information indicating the starting symbol may be hard-wired into the UE or stored on a subscriber identity module (SIM) or universal subscriber identity module (USIM) card for the UE, such that the UE may obtain the information indicating the starting symbol within the UE.
  • SIM subscriber identity module
  • USIM universal subscriber identity module
  • the first UE may make a determination on how to transmit information associated with the first transmission according to a case where the first transmission is assembled to start from the first starting symbol of the two starting symbols in the slot.
  • the first UE may perform operations based on the determination related to the first transmission, i.e., the determination made in step 301.
  • the first UE may determine that resource (s) available for transmission starts from the second starting symbol of the two starting symbols in the slot, for example, based on results of channel access procedures, e.g., a channel access procedure for the first starting symbol fails while a channel access procedure for the second starting symbol succeeds.
  • the first UE may determine to drop the first transmission in response to determining that resource (s) available for transmission starts from the second starting symbol of the two starting symbols in the slot. Then, in step 303, the first UE may drop the first transmission based on the determination made in step 301.
  • the first UE may determine to perform the following operations in response to determining that resource (s) available for transmission starts from the second starting symbol of the two starting symbols in the slot: puncturing the first transmission to obtain a second transmission including first one or more symbols of the first transmission such that the second transmission starts from the second starting symbol of the two starting symbols; and transmitting the second transmission instead of the first transmission.
  • the second transmission may end at an ending symbol which is the same as the ending symbol of the first transmission.
  • the first UE may perform the second transmission based on the determination made in step 301.
  • FIG. 4 illustrates an exemplary puncturing operation performed by the first UE to obtain a transmission starting from a second starting symbol in a slot according to some embodiments of the present application.
  • two starting symbols are supported in a slot which includes symbol #0 to symbol #13, wherein the first starting symbol of the two starting symbols in the slot is symbol #0 and the second starting symbol of the two starting symbols in the slot is symbol #7.
  • transmission #1 is assembled to start from symbol #0 and end at symbol #13 and has the structure as shown in FIG. 2A.
  • Transmission #1 may include an SL CSI request (e.g., in a 2 nd -stage SCI included in PSSCH (s) ) and SL CSI-RS (e.g., in PSSCH (s) ) .
  • the first UE may puncture transmission #1 to obtain transmission #2 including first 6 symbols (e.g., symbol #0 to symbol #5) of transmission #1 such that transmission #2 starts from symbol #7 and ends at symbol #13.
  • first 6 symbols e.g., symbol #0 to symbol #5
  • the ending symbol (e.g., symbol #13) of the slot is a guard symbol.
  • the ending symbol of the slot may be not a guard symbol, but is a symbol to carry a PSSCH transmission (e.g., the slot is in a COT for SL transmission) .
  • transmission #2 obtained by a puncturing operation may include first 7 symbols (e.g., symbol #0 to symbol #6) of transmission #1.
  • the ending symbol of the slot may be a symbol for performing a channel access procedure. In such examples, transmission #1 and transmission #2 may not include the ending symbol of the slot, and the ending symbols of transmission #1 and transmission #2 may be symbol #12.
  • the first UE may determine to perform the following operations in response to determining that resource (s) available for transmission starts from the second starting symbol of the two starting symbols in the slot:
  • the re-assembled third transmission may end at an ending symbol which is the same as the ending symbol of the first transmission.
  • the first UE may perform the aforementioned operations based on the determination made in step 301.
  • the first UE may determine to perform the following operations in response to determining that resource (s) available for transmission starts from the second starting symbol of the two starting symbols in the slot: performing the puncturing operation according to option 2 to obtain a second transmission; transmitting the second transmission instead of the first transmission in the slot; and transmitting a fourth transmission including the SL CSI request and SL CSI-RS in a succeeding slot immediately after the second transmission.
  • the fourth transmission may have the same slot structure as the first transmission.
  • the first UE may perform the aforementioned operations based on the determination made in step 301.
  • FIG. 5 illustrates a flowchart of an exemplary method 500 for SL CSI reporting over unlicensed spectra according to some other embodiments of the present application.
  • the method 500 illustrated in FIG. 5 may be performed by a second UE which transmits SL CSI report (s) (also referred to as a CSI reporting UE) .
  • s SL CSI report
  • two starting symbols i.e., a first starting symbol and a second starting symbol
  • a first starting symbol and a second starting symbol are supported in a slot for transmitting an SL transmission.
  • the second UE may make a determination on how to transmit information associated with an SL CSI report according to a case where the second UE receives a transmission which starts from the second starting symbol of the two starting symbols in the slot, wherein the transmission at least includes an SL CSI request associated with the SL CSI report.
  • the first UE may transmit the information associated with the SL CSI report based on the determination made in step 501.
  • the second UE may perform the following operations.
  • the second UE may determine whether SL CSI-RS is included in the transmission including the SL CSI request.
  • the second UE may derive (or determine) CSI from the SL CSI-RS. Then, the second UE may determine to transmit the SL CSI report to a first UE, which transmits the SL CSI request, based on a CSI reporting configuration.
  • the CSI reporting configuration may be configured, pre-configured, or pre-defined to the second UE.
  • the CSI reporting configuration may include a latency bound for transmitting the SL CSI report.
  • the second UE may determine to transmit an indicator indicating that a reception of SL CSI-RS is failed to the first UE which transmits the SL CSI request.
  • the second UE may transmit the SL CSI report or the indicator indicating that a reception of SL CSI-RS is failed to the first UE which transmits the SL CSI request based on the determination made in step 501. That is, the information associated with the SL CSI report transmitted in step 503 may include the SL CSI report or the aforementioned indicator.
  • the indicator may be transmitted via (e.g., in) a physical sidelink feedback channel (PSFCH) symbol, which may be associated with the slot, in which the transmission including the SL CSI request is located.
  • PSFCH physical sidelink feedback channel
  • Options 1-3 of the method 300 illustrated in FIG. 3 and the method 500 illustrated in FIG. 4 may be performed separately by a CSI triggering UE and a CSI reporting UE, or performed in various combinations by the CSI triggering UE and the CSI reporting UE.
  • the CSI triggering UE performs option 1 of the method 300, while the CSI reporting UE does not perform the method 500.
  • the CSI triggering UE performs option 2 of the method 300, and the CSI reporting UE performs the method 500.
  • the CSI triggering UE performs option 3 of the method 300, and the CSI reporting UE performs the method 500.
  • the CSI triggering UE performs option 4 of the method 300, and the CSI reporting UE performs the method 500.
  • the CSI triggering UE may transmit the second transmission in a slot (e.g., slot #m) and transmit the fourth transmission in a succeeding slot (e.g., slot #m+1) immediately after the second transmission to the CSI reporting UE. Consequently, the CSI reporting UE may receive the second transmission and the fourth transmission.
  • a slot e.g., slot #m
  • a succeeding slot e.g., slot #m+1
  • the CSI reporting UE may transmit, to the CSI triggering UE, an SL CSI report including CSI derived from CSI-RS in one of the second transmission or the fourth transmission and an indicator indicating that a reception of CSI-RS in the other one of the second transmission or the fourth transmission is failed.
  • the CSI triggering UE may determine a triggering slot (i.e., the slot including an SL CSI request associated with the SL CSI report) based on a PSFCH symbol in which the indicator is fed back.
  • the triggering slot is slot #m+1.
  • the triggering slot is slot #m.
  • the CSI reporting UE may transmit, to the CSI triggering UE, a first indicator in a PSFCH symbol corresponding to slot #m and a second indicator in a PSFCH symbol corresponding to slot #m+1.
  • the first indicator may indicate that a reception of CSI-RS in the second transmission is failed.
  • the second indicator may indicate that a reception of CSI-RS in the fourth transmission is failed.
  • the CSI triggering UE may determine that the CSI reporting UE will not transmit SL CSI report associated with the SL CSI request.
  • a COT may be initiated for sidelink transmission by the UE (referred to as a COT initiating UE) .
  • the COT may be a period during which the channel can be used by the UE until the end of the period.
  • one or more transmissions may be exchanged between the COT initiating UE and one or more COT responding UE over sidelink.
  • the COT may be shared by the COT initiating UE to the one or more COT responding UEs. In such embodiments, if a transmission including an SL CSI request and CSI-RS is transmitted in a slot within the COT, how to perform the CSI reporting needs to be solved.
  • FIG. 6 illustrates a flowchart of an exemplary method 600 for SL CSI reporting over unlicensed spectra according to some embodiments of the present application.
  • the method 600 illustrated in FIG. 6 may be performed by a first UE which transmits SL CSI-RS (i.e., a CSI triggering UE) .
  • the first UE may be a COT initiating UE or a COT responding UE.
  • the first UE may make a determination on how to transmit information associated with a transmission at least including an SL CSI request and SL CSI-RS according to a case where the transmission is to be transmitted in a slot within a COT initiated for sidelink transmission.
  • the first UE may perform operations based on the determination related to the transmission, i.e., the determination made in step 601.
  • the first UE may perform the following operations:
  • the first UE may determine whether an SL CSI report associated with the transmission including the SL CSI request is to be transmitted within the COT. In an embodiment, whether the SL CSI report associated with the transmission is to be transmitted within the COT may be determined based on the slot where the transmission is located, a latency bound for CSI reporting, and the COT. For example, if the resource (s) (i.e., one or more slots) available for the CSI reporting UE within the COT is (are) within the range of resources for CSI reporting, the first UE may determine that the SL CSI report associated with the transmission is to be transmitted within the COT. Otherwise, the first UE may determine that the SL CSI report associated with the transmission is not to be transmitted within the COT.
  • the range of resources for CSI reporting is defined by the slot where the SL CSI-RS is transmitted, and the latency bound for CSI reporting as specified in 3GPP standard documents.
  • the first UE may determine to transmit an indicator indicating whether the SL CSI report is to be transmitted within the COT. That is, the information associated with the transmission to be transmitted may include the indicator indicating whether the SL CSI report associated with the transmission is to be transmitted within the COT.
  • the first UE may transmit the aforementioned indicator to a second UE, i.e., a CSI reporting UE which will transmit SL CSI report (s) , based on the determination made in step 601.
  • the indicator may be carried in the transmission.
  • the indicator may be carried in SCI (e.g., the 2 nd -stage SCI) in the transmission.
  • the first UE may be a COT initiating UE.
  • information of the COT e.g., COT sharing information
  • the first UE may transmit COT sharing information to the second UE for transmitting the SL CSI report.
  • the first UE may be a COT responding UE.
  • the first UE may receive information of the COT (e.g., COT sharing information) from a COT initiating UE.
  • FIG. 7 illustrates a flowchart of an exemplary method 700 for SL CSI reporting over unlicensed spectra according to some other embodiments of the present application.
  • the method 700 illustrated in FIG. 7 may be performed by a second UE which transmits SL CSI report (s) (i.e., a CSI reporting UE) .
  • the second UE may be a COT initiating UE or a COT responding UE.
  • the second UE may make a determination on how to transmit information associated with an SL CSI report according to a case where the second UE receives a transmission in a slot within a COT initiated for sidelink transmission.
  • the transmission may at least include an SL CSI request associated with the SL CSI report.
  • the transmission may at least include an SL CSI request associated with the SL CSI report and SL CSI-RS.
  • the determination on how to transmit information associated with the SL CSI report may include the determination on whether to transmit the SL CSI report within the COT.
  • the second UE may transmit the information associated with the SL CSI report based on the determination made in step 701.
  • the information associated with the SL CSI report may include the SL CSI report.
  • the second UE may receive an indicator indicating whether the SL CSI report is to be transmitted within the COT from a first UE (i.e., a CSI triggering UE which transmits SL CSI-RS) .
  • the indicator may be carried in the transmission including the SL CSI request associated with the SL CSI report.
  • the indicator may be carried in SCI (e.g., the 2 nd -stage SCI) in the transmission.
  • the second UE may determine to transmit the SL CSI report based on the indicator and information of the COT.
  • the second UE may be a COT responding UE.
  • the indicator may indicate to transmit the SL CSI report within the COT.
  • the second UE may receive the information of the COT (e.g., COT sharing information) from the first UE, and determine to transmit the SL CSI report within the COT based on the COT sharing information.
  • the second UE may prioritize a transmission of the SL CSI report within the indicated slot (s) .
  • the second UE may prioritize a transmission of the SL CSI report within the shared slot (s) .
  • the earlier channel access opportunities for the SL CSI reporting may be achieved by applying a longer cyclic prefix extension (CPE) length or applying a Type-2 dynamic channel access procedure with a shorter duration, compared to other sidelink transmission (s) .
  • CPE cyclic prefix extension
  • a CPE may be transmitted by a UE to occupy a channel until the beginning of a target transmission when the channel is determined to be available based on a channel access procedure before the beginning of the target transmission.
  • What is transmitted in the CPE may include a repetition of cyclic prefix (CP) of the first symbol within the target transmission.
  • CP cyclic prefix
  • the second UE may be a COT initiating UE.
  • the indicator received from the first UE may indicate to transmit the SL CSI report within the COT.
  • the second UE may determine to transmit the SL CSI report within the COT based on the information of the COT, which is known by the second UE.
  • the indicator received from the first UE may indicate not to transmit the SL CSI report within the COT.
  • the second UE may determine to transmit the SL CSI report in a slot later than the COT and within a latency bound for transmitting the SL CSI report.
  • the second UE may transmit the SL CSI report based on the determination made in step 701.
  • the CSI reporting UE is expected to feed back the CSI within a latency bound, which may be determined by the CSI triggering UE and provided to the CSI reporting UE via PC5-RRC signaling.
  • the latency bound may be defined in terms of slots within a range of [3, 160] .
  • a channel access opportunity may be obtained based on a result of a channel access procedure.
  • the opportunistic channel access mechanism in unlicensed spectra probably needs a longer feedback latency. In such cases, how to speed up the feedback of an SL CSI report in unlicensed spectra which intensify the uncertainty of channel access needs to be solved.
  • the SL CSI report may be transmitted in a 2 nd stage SCI.
  • the CSI reporting UE may also determine to transmit information (e.g., an indicator) associated with the SL CSI report.
  • FIG. 8 illustrates a flowchart of an exemplary method for SL CSI reporting over unlicensed spectra according to some embodiments of the present application.
  • the method in the example of FIG. 8 may be performed by a first UE (e.g., UE 101a in FIG. 1) and a second UE (e.g., UE 101b in FIG. 1) .
  • the first UE may be a CSI triggering UE which transmits SL CSI-RS.
  • the second UE may be a CSI reporting UE which transmits SL CSI report (s) .
  • s SL CSI report
  • the first UE may transmit a transmission at least including an SL CSI request and SL CSI-RS to the second UE.
  • the SL CSI request may be transmitted in SCI (e.g., 2 nd -stage SCI) and the SL CSI-RS may be transmitted in a PSSCH transmission in the transmission.
  • the SL CSI request may indicate the second UE to report CSI associated with the SL CSI-RS.
  • the second UE may determine how to transmit information associated with an SL CSI report according to a case where the SL CSI report is transmitted in a 2 nd -stage SCI. Then, in operation 803, in addition to transmitting the SL CSI report in the 2 nd -stage SCI to the first UE, the second UE may also transmit the information associated with the SL CSI report based on the determination made in operation 802 to the first UE.
  • the following embodiments provide several solutions regarding determining how to transmit the information associated with the SL CSI report in operation 802.
  • the SL CSI report may be included in reserved bits in legacy 2 nd -stage SCI (e.g., SCI format 2-A or SCI format 2-B) as specified in 3GPP standard documents.
  • legacy 2 nd -stage SCI e.g., SCI format 2-A or SCI format 2-B
  • the second UE may determine to transmit a first indicator in SCI (e.g., 1 st -stage SCI or 2 nd stage SCI) associated with the SL CSI report, wherein the first indicator may indicate whether data is included in a PSSCH transmission associated with the SL CSI report.
  • the first indicator may be a 1-bit indicator, wherein a value of "0" indicates that data is not included in a PSSCH transmission associated with the SL CSI report and a value of "1" indicates that data is included in a PSSCH transmission associated with the SL CSI report, or vice versa.
  • the information associated with the SL CSI report may include the indicator.
  • the second UE may transmit the first indicator and the SL CSI report to the first UE.
  • the SL CSI report can be transmitted regardless of whether data is included in a PSSCH transmission associated with the SL CSI report.
  • the case where the first indicator indicating that data is not included in a PSSCH transmission associated with the SL CSI report can be regarded as a rate matching pattern.
  • the SL CSI report may be included in the 2 nd -stage SCI with a new format (e.g., SCI format 2-C) different from legacy 2 nd -stage SCI formats (e.g., SCI format 2-A and SCI format 2-B) as specified in 3GPP standard documents.
  • a new format e.g., SCI format 2-C
  • legacy 2 nd -stage SCI formats e.g., SCI format 2-A and SCI format 2-B
  • the second UE may determine to transmit a second indicator in SCI (e.g., 1 st -stage SCI) , wherein the second indicator may indicate a format of the 2 nd -stage SCI including the SL CSI report.
  • the information associated with the SL CSI report may include the second indicator.
  • the second indicator may be a 2-bit indicator, wherein a first value (e.g., "00” ) indicates SCI format 2-A, a second first (e.g., "01” ) indicates SCI format 2-B, and a third value (e.g., "10” ) indicates SCI format 2-C.
  • the second UE may determine to transmit the second indicator with a value of "10" to indicate SCI format 2-C for the SL CSI report.
  • the second UE may transmit the second indicator and the SL CSI report to the first UE.
  • the second UE may further determine to transmit a third indicator in SCI (e.g., 1 st -stage SCI or 2 nd -stage SCI) associated with the SL CSI report, wherein the third indicator may indicate whether data is included in a PSSCH transmission associated with the SL CSI report.
  • SCI e.g., 1 st -stage SCI or 2 nd -stage SCI
  • the third indicator may indicate whether data is included in a PSSCH transmission associated with the SL CSI report.
  • the information associated with the SL CSI report may also include the third indicator.
  • the second UE may transmit the second indicator, the third indicator, and the SL CSI report to the first UE.
  • a PSSCH transmission associated with the SL CSI report may not include data.
  • the second indicator indicating the format of the 2 nd -stage SCI including the SL CSI report may also indicate that data is not included in a PSSCH transmission associated with the SL CSI report, and thus the third indicator is not needed.
  • FIG. 9 illustrates a simplified block diagram of an exemplary apparatus 900 for SL CSI reporting over unlicensed spectra according to some embodiments of the present application.
  • the apparatus 900 may be or include at least part of a UE (e.g., UE 101a or UE 101b in FIG. 1) .
  • the apparatus 900 may include at least one transceiver 902 and at least one processor 906.
  • the at least one transceiver 902 is coupled to the at least one processor 906.
  • the transceiver 902 may be divided into two devices, such as receiving circuitry (or a receiver) and transmitting circuitry (or a transmitter) .
  • the apparatus 900 may further include an input device, a memory, and/or other components.
  • the transceiver 902 and the processor 906 may be configured to perform any of the methods described herein (e.g., the methods described with respect to FIGS. 3-8 or other methods described in the embodiments of the present application) .
  • the apparatus 900 may be a CSI triggering UE which transmits CSI-RS, and the transceiver 902 and the processor 906 may be configured to perform operations of a CSI triggering UE in any of the methods as described with respect to FIGS. 3, 4, 6, and 8 or other methods described in the embodiments of the present application.
  • the processor 906 is configured to cause the apparatus 900 to: determine how to transmit information associated with a first transmission at least including an SL CSI request and SL CSI CSI-RS according to one of the following cases: a first case where the first transmission is assembled to start from a first starting symbol of two starting symbols in a slot; or a second case where the first transmission is to be transmitted in a slot within a COT initiated for sidelink transmission; and perform operations based on the determination related to the first transmission.
  • the apparatus 900 may be a CSI reporting UE which transmits CSI report (s)
  • the transceiver 902 and the processor 906 may be configured to perform operations of a CSI reporting UE in any of the methods as described with respect to FIGS. 5, 7, and 8 or other methods described in the embodiments of the present application.
  • the processor 906 is configured to cause the CSI reporting UE to: determine how to transmit information associated with an SL CSI report according to one of the following cases: a first case where the CSI reporting UE receives a first transmission which starts from a second starting symbol of two starting symbols in a slot, wherein the first transmission at least includes an SL CSI request associated with the SL CSI report; a second case where the CSI reporting UE receives a first transmission in a slot within a COT initiated for sidelink transmission, wherein the first transmission at least includes an SL CSI request associated with the SL CSI report; or a third case where the SL CSI report is to be transmitted in a 2 nd -stage SCI; and transmit the information associated with the SL CSI report based on the determination.
  • the apparatus 900 may further include at least one non-transitory computer-readable medium.
  • the non-transitory computer-readable medium may have stored thereon computer-executable instructions to cause the processor 906 to implement any of the methods as described above.
  • the computer-executable instructions when executed, may cause the processor 906 to interact with the transceiver 902, so as to perform operations of the methods, e.g., as described with respect to FIGS. 3-8 or other methods described in the embodiments of the present application.
  • the method according to any of the embodiments of the present application can also be implemented on a programmed processor.
  • the controllers, flowcharts, and modules may also be implemented on a general purpose or special purpose computer, a programmed microprocessor or microcontroller and peripheral integrated circuit elements, an integrated circuit, a hardware electronic or logic circuit such as a discrete element circuit, a programmable logic device, or the like.
  • any device on which resides a finite state machine capable of implementing the flowcharts shown in the figures may be used to implement the processor functions of this application.
  • an embodiment of the present application provides an apparatus for SL CSI reporting over unlicensed spectra, including a processor and a memory.
  • Computer programmable instructions for implementing a method for SL CSI reporting over unlicensed spectra are stored in the memory, and the processor is configured to perform the computer programmable instructions to implement the method for SL CSI reporting over unlicensed spectra.
  • the method for SL CSI reporting over unlicensed spectra may be any method as described in the present application.
  • An alternative embodiment preferably implements the methods according to embodiments of the present application in a non-transitory, computer-readable storage medium storing computer programmable instructions.
  • the instructions are preferably executed by computer-executable components preferably integrated with a network security system.
  • the non-transitory, computer-readable storage medium may be stored on any suitable computer readable media such as RAMs, ROMs, flash memory, EEPROMs, optical storage devices (CD or DVD) , hard drives, floppy drives, or any suitable device.
  • the computer-executable component is preferably a processor but the instructions may alternatively or additionally be executed by any suitable dedicated hardware device.
  • an embodiment of the present application provides a non-transitory, computer-readable storage medium having computer programmable instructions stored therein.
  • the computer programmable instructions are configured to implement a method for SL CSI reporting over unlicensed spectra according to any embodiment of the present application.

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Abstract

Des modes de réalisation de la présente invention concernent des procédés et des appareils d'établissement de rapport d'informations d'état de canal (CSI) de liaison latérale (SL) sur des spectres sans licence. Selon un mode de réalisation de la présente invention, un premier équipement utilisateur (UE) peut comprendre : un émetteur-récepteur; et un processeur couplé à l'émetteur-récepteur et configuré pour amener le premier UE à : effectuer une détermination sur la manière de transmettre des informations associées à une première transmission comprenant au moins une demande de CSI SL et un signal de référence de CSI SL (CSI-RS) selon l'un des cas suivants : un premier cas où la première transmission est assemblée pour démarrer à partir d'un premier symbole de départ de deux symboles de départ dans un créneau; ou un second cas dans lequel la première transmission doit être transmise dans un créneau à l'intérieur d'un temps d'occupation de canal initié pour une transmission de liaison latérale; et effectuer des opérations sur la base de la détermination associée à la première transmission.
PCT/CN2023/085774 2023-03-31 2023-03-31 Procédés et appareils d'établissement de rapport de csi de liaison latérale sur des spectres sans licence WO2024074020A1 (fr)

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