Method and apparatus for channel measurement of sidelink unlicensed spectrum

Abstract

The embodiment of the invention relates to a channel measurement method and device for sidelink unlicensed spectrum (SL-U). In accordance with some embodiments of the present disclosure, a user equipment (UE) may include: a transceiver; and a processor coupled to the transceiver. The processor may be configured to: receive, via the transceiver, at least one of: a configuration from a network node, where the configuration includes a threshold value related to a linear average value of total received power over a unit of time, and where the unit of time is one of: a time slot, a mini-slot, and a sub-slot; a sidelink control information (SCI) transmission over the unit of time on a sidelink on an unlicensed frequency band; or a sequence transmission within the unit of time on the sidelink on the unlicensed frequency band; and determining whether to observe a sidelink received signal strength indicator (SL RSSI) within the unit of time of the sidelink on the unlicensed frequency band.

Description

Technical Field

[0001] Embodiments of the present disclosure generally relate to wireless communication technology, and more particularly, to a method and apparatus for channel measurement of a sidelink unlicensed spectrum (SL-U). Background Art

[0002] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcast, etc. Wireless communication systems may employ multiple access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of wireless communication systems may include fourth generation (4G) systems such as long term evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may also be referred to as new radio (NR) systems.

[0003] In the wireless communication system described above, a user equipment (UE) can communicate with another UE via a data path supported by an operator network (eg, a cellular or Wi-Fi network infrastructure). The data path supported by the operator network may include a base station (BS) and multiple gateways.

[0004] Some wireless communication systems may support sidelink communications, where devices (e.g., UEs) that are relatively close to each other may communicate directly with each other via a sidelink, rather than being linked through a BS. The term "sidelink" may refer to a radio link established for communication between devices (e.g., UEs) rather than communicating via a cellular infrastructure (e.g., uplink and downlink). Sidelink transmissions may be performed on licensed and unlicensed spectrum. Unlicensed spectrum may also be referred to as an unlicensed band, etc.

[0005] Currently, details about channel measurements for SL-U have not been discussed. Summary of the invention

[0006] Some embodiments of the present disclosure provide a user equipment (UE). The UE may include: a transceiver; and a processor coupled to the transceiver. The processor may be configured to: receive at least one of the following via the transceiver: a configuration from a network node, wherein the configuration includes a first threshold value related to a linear average value of a total received power within a time unit, and wherein the time unit is one of the following: a time slot, a mini-time slot, and a sub-time slot; a sidelink control information (SCI) transmission within the time unit on a sidelink on an unlicensed band; or a sequence transmission within the time unit on the sidelink on the unlicensed band; and determine whether to observe a sidelink received signal strength indicator (SL RSSI) within the time unit of the sidelink on the unlicensed band.

[0007] In some embodiments, the processor of the UE is configured to: measure a first linear average of the total received power observed in the first frequency domain resource and the first time domain resource within the time unit; measure a second linear average of the total received power observed in the first frequency domain resource and the second time domain resource within the time unit; determine whether the difference between the first linear average of the total received power and the second linear average of the total received power is equal to or less than the first threshold; and in response to the difference being equal to or less than the first threshold, determine that the SL RSSI is observed within the time unit.

[0008] In some embodiments, the first threshold has a fixed value, a configured value, or a preconfigured value.

[0009] In some embodiments, the first threshold is configured or preconfigured per subcarrier spacing (SCS) or per resource pool.

[0010] In some embodiments, in response to determining to observe the SL RSSI, the processor of the UE is configured to determine a third linear average of the total received power within the time unit as the SLRSSI, which will be one of: the first linear average of the total received power; the second linear average of the total received power; the linear average of the first linear average of the total received power and the second linear average of the total received power; and the linear average of the total received power within the time unit.

[0011] In some embodiments, the first time domain resource includes one or more symbols after the start symbol of the time unit and before the second time domain resource within the time unit; and the second time domain resource includes one or more symbols after the first time domain resource and before the end symbol of the time unit.

[0012] In some embodiments, the processor of the UE is configured to: determine whether a sidelink control information (SCI) transmission or at least one of a sequence transmission is transmitted within the time unit; and in response to detecting the at least one of the SCI transmission or the sequence transmission transmitted within the time unit, determine to observe the SL RSSI within the time unit.

[0013] In some embodiments, in response to determining to observe the SL RSSI, the processor of the UE is configured to measure a third linear average of total received power in the first frequency domain resource within the time unit as the SL RSSI.

[0014] In some embodiments, the first frequency-domain resources include at least one of: one or more subchannels; one or more interlaces; one or more resource block (RB) sets; or a measurement bandwidth.

[0015] In some embodiments, at least one of the first linear average of the total received power, the second linear average of the total received power, or the third linear average of the total received power is measured from: a symbol after the starting symbol of the time unit; or a configured starting point after the starting symbol of the time unit.

[0016] In some embodiments, the configuration includes at least one of: a second threshold value associated with a linear average of a total received power sensed per time unit over a channel busy rate (CBR) measurement window for the sidelink on the unlicensed band; a default value for a sidelink CBR measurement value for the sidelink on the unlicensed band; or a minimum total number of RSSI measurement time units for the sidelink on the unlicensed band.

[0017] In some embodiments, in order to determine whether to observe the SL RSSI, the processor of the UE is configured to: receive information about a wireless local area network (WLAN) RSSI measurement time unit within a channel busy rate (CBR) measurement window; and determine whether there is a SL RSSI measurement time unit by excluding the WLAN RSSI measurement time unit from the RSSI measurement time unit within the CBR measurement window.

[0018] In some embodiments, the processor of the UE is configured to: determine whether the total number of SLRSSI measurement time units within the CBR measurement window is less than the minimum total number, wherein the linear average of the total received power of the SL RSSI within each of the SL RSSI measurement time units exceeds the second threshold; and in response to the total number being less than the minimum total number, set the total number to the default value.

[0019] Some embodiments of the present application also provide a network node (e.g., a base station (BS)). The network node includes: a transceiver; and a processor coupled to the transceiver. The processor can be configured to transmit a configuration for a sidelink configuration on an unlicensed band to a user equipment (UE) via the transceiver, wherein: the configuration includes a first threshold value related to a linear average value of a total received power within a time unit; the time unit is one of the following: a time slot, a mini-time slot, and a sub-time slot; and in response to a difference between a first linear average value of the total received power observed in a first frequency domain resource and a first time domain resource within the time unit and a second linear average value of the total received power observed in the first frequency domain resource and a second time domain resource within the time unit being equal to or less than the first threshold value, the UE determines to observe the SL RSSI within the time unit.

[0020] In some embodiments, the first threshold has a fixed value, a configured value, or a preconfigured value.

[0021] In some embodiments, the first threshold is configured or preconfigured per subcarrier spacing (SCS) or per resource pool.

[0022] In some embodiments, the first frequency domain resources include at least one of: one or more subchannels; one or more interlaces; one or more resource block (RB) sets; or a measurement bandwidth.

[0023] In some embodiments, the first time domain resource includes one or more symbols after the start symbol of the time unit and before the second time domain resource within the time unit; and the second time domain resource includes one or more symbols after the first time domain resource and before the end symbol of the time unit.

[0024] In some embodiments, the configuration includes at least one of: a second threshold value associated with a linear average of a total received power sensed per time unit over a channel busy rate (CBR) measurement window for the sidelink on the unlicensed band; a default value for a sidelink CBR measurement value for the sidelink on the unlicensed band; or a minimum total number of RSSI measurement time units for the sidelink on the unlicensed band.

[0025] In some embodiments, in response to the total number of SL RSSI measurement time units within the CBR measurement window being less than the minimum total number, the total number is set by the UE to the default value.

[0026] Some embodiments of the present disclosure also provide a method performed by a user equipment (UE). The method may include: receiving at least one of the following: a configuration from a network node, wherein the configuration includes a first threshold value related to a linear average of total received power within a time unit, and wherein the time unit is one of the following: a time slot, a mini-time slot, and a sub-time slot; a sidelink control information (SCI) transmission within the time unit on a sidelink on an unlicensed frequency band; or a sequence transmission within the time unit on the sidelink on the unlicensed frequency band; and determining whether to observe a sidelink received signal strength indicator (SL RSSI) within the time unit of the sidelink on the unlicensed frequency band.

[0027] Some embodiments of the present disclosure also provide a method performed by a network node (e.g., a BS). The method may include transmitting a configuration for a sidelink configuration on an unlicensed band to a user equipment (UE), wherein: the configuration includes a first threshold value related to a linear average value of total received power within a time unit; the time unit is one of: a time slot, a mini-time slot, and a sub-time slot; and in response to a difference between a first linear average value of total received power observed in a first frequency domain resource and a first time domain resource within the time unit and a second linear average value of total received power observed in the first frequency domain resource and a second time domain resource within the time unit being equal to or less than the first threshold value, the UE determines to observe the SL RSSI within the time unit.

[0028] Some embodiments of the present disclosure provide a device. According to some embodiments of the present disclosure, the device may include: at least one non-transitory computer-readable medium having computer-executable instructions stored thereon; at least one receiving circuit system; at least one transmitting circuit system; and at least one processor coupled to the at least one non-transitory computer-readable medium, the at least one receiving circuit system, and the at least one transmitting circuit system, wherein the at least one non-transitory computer-readable medium and the computer-executable instructions may be configured to use the at least one processor to cause the device to perform a method performed by a UE or a network node (e.g., a base station (BS)) according to some embodiments of the present disclosure.

[0029] The details of one or more examples are set forth in the accompanying drawings and the description below. Other features, objects, and advantages will be apparent from the description and drawings, and from the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to describe the manner in which the advantages and features of the present disclosure can be obtained, the description of the present disclosure is presented by reference to specific embodiments of the present disclosure illustrated in the accompanying drawings. These drawings depict only exemplary embodiments of the present disclosure and therefore should not be considered limiting of its scope.

[0031] Figure 1 A schematic diagram illustrating a wireless communication system according to some embodiments of the present disclosure.

[0032] Figure 2 Flowchart illustrating an exemplary procedure related to SL RSSI via unlicensed spectrum according to some embodiments of the present disclosure.

[0033] Figure 3 An exemplary diagram illustrating SL RSSI measurements in a CBR measurement window according to some embodiments of the present disclosure.

[0034] Figure 4 An exemplary flow chart illustrating SL RSSI measurements according to some embodiments of the present disclosure.

[0035] Figure 5 Another exemplary flow chart illustrating SL RSSI measurement according to some embodiments of the present disclosure.

[0036] Figure 6 A block diagram illustrating an exemplary apparatus according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0037] The detailed description of the drawings is intended as a description of the preferred embodiments of the present disclosure and is not intended to represent the only form in which the present disclosure can be practiced. It should be understood that the same or equivalent functions can be accomplished by different embodiments that are intended to be included in the spirit and scope of the present disclosure.

[0038] Reference will now be made in detail to some embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. To facilitate understanding, embodiments are provided under specific network architectures and new service scenarios (e.g., 3rd Generation Partnership Project (3GPP) 5G (NR), 3GPP Long Term Evolution (LTE) Release 8, etc.). With due consideration, all embodiments in the present disclosure are also applicable to similar technical issues as network architectures and new service scenarios evolve; and in addition, the terms cited in the present disclosure may be changed, which should not affect the principles of the present disclosure.

[0039] Figure 1 A schematic diagram illustrating a wireless communication system according to some embodiments of the present disclosure.

[0040] like Figure 1 As shown in FIG. 1 , wireless communication system 100 may include a base station (e.g., BS 120) and some UEs 110 (e.g., UE 110a, UE 110b, and UE 110c). Figure 1A specific number of UEs 110 and one BS 120 are depicted in FIG. 1 , but it is contemplated that any number of BSs and UEs within and outside the coverage of the BS may be included in the wireless communication system 100 .

[0041] In some embodiments of the present disclosure, BS 120 may be referred to as an access point, access terminal, base, base unit, macro cell, Node B, evolved Node B (eNB), gNB, home Node B, relay node or device, or described using other terms used in the art. BS 102 is typically part of a radio access network that may include one or more controllers communicatively coupled to one or more corresponding BSs. BS 120 may communicate with UE 110 via downlink (DL) communication signals.

[0042] UE 110 (e.g., UE 110a, UE 110b, or UE 110c) may include a computing device, such as a desktop computer, a laptop computer, a personal digital assistant (PDA), a tablet computer, a smart TV (e.g., a TV connected to the Internet), a set-top box, a game console, a security system (including a security camera), a vehicle-mounted computer, a network device (e.g., a router, a switch, and a modem), etc. According to some embodiments of the present disclosure, UE 110 may include a portable wireless communication device, a smart phone, a cellular phone, a flip phone, a device with a subscriber identity module, a personal computer, a selective call receiver, or any other device capable of sending and receiving communication signals on a wireless network. In some embodiments of the present disclosure, UE 110 includes a wearable device, such as a smart watch, a fitness band, an optical head-mounted display, etc. In addition, UE 110 may be referred to as a subscriber unit, a mobile device, a mobile station, a user, a terminal, a mobile terminal, a wireless terminal, a fixed terminal, a subscriber station, a user terminal, an IoT device, a vehicle, or a device, or described using other terms used in the art. UE 110 may communicate with BS 120 via uplink (UL) communication signals.

[0043] The wireless communication system 100 may be compatible with any type of network capable of sending and receiving wireless communication signals. For example, the wireless communication system 100 is compatible with a wireless communication network, a cellular telephone network, a network based on time division multiple access (TDMA), a network based on code division multiple access (CDMA), a network based on orthogonal frequency division multiple access (OFDMA), an LTE network, a network based on 3GPP, a 3GPP5G network, a satellite communication network, a high altitude platform network, and / or other communication networks.

[0044] In some embodiments of the present disclosure, the wireless communication system 100 is compatible with the 5G NR of the 3GPP protocol. For example, the BS 120 may transmit data on the DL using an orthogonal frequency division multiplexing (OFDM) modulation scheme and the UE 110 may transmit data on the UL using a discrete Fourier transform spread spectrum orthogonal frequency division multiplexing (DFT-S-OFDM) or cyclic prefix OFDM (CP-OFDM) scheme. However, more generally, the wireless communication system 100 may implement some other open or proprietary communication protocols, such as WiMAX and other protocols.

[0045] In some embodiments of the present disclosure, BS 120 and UE 110 may communicate using other communication protocols (e.g., IEEE 802.11 series wireless communication protocols). In addition, in some embodiments of the present disclosure, BS 120 and UE 110 may communicate via licensed spectrum, while in some other embodiments, BS 120 and UE 110 may communicate via unlicensed spectrum. The present disclosure is not intended to be limited to implementations of any particular wireless communication system architecture or protocol.

[0046] BS 120 may define one or more cells, and each cell may have a coverage area 130. In exemplary wireless communication system 100, some UEs (eg, UE 110a and UE 110b) are within the coverage of BS 120, but BS 120 may not be as Figure 1 120, and may be any one of the BSs 120 in the wireless communication system, and some UEs (e.g., UE 110c) are outside the coverage of the BSs 120. For example, in the case where the wireless communication system includes two BSs 120, UE 110a being within the coverage of any one of the two BSs means that UE 110a is within the coverage of the BSs 120 in the wireless communication system (i.e., within the coverage); and UE 110a being outside the coverage of the two BSs 120 means that UE 110a is outside the coverage of the BSs 120 in the wireless communication system (i.e., outside the coverage).

[0047] Still refer to Figure 1 UE 110a and UE 110b may communicate with each other via, for example, a Uu link (by Figure 1 ) and BS 120. UE 110a, UE 110b, and UE 110c may communicate via a side link (indicated by a dashed arrow in FIG. Figure 1 The solid arrows in the figure indicate that the two devices communicate with each other.

[0048] The sidelink transmission may involve a physical sidelink control channel (PSCCH) and an associated physical sidelink shared channel (PSSCH), which may be scheduled by sidelink control information (SCI) carried on the PSCCH. The SCI and associated PSSCH may be transmitted from a transmitting UE (hereinafter referred to as "Tx UE") to a receiving UE (hereinafter referred to as "Rx UE") in a unicast manner, in a groupcast manner to a group of Rx UEs, or in a broadcast manner to Rx UEs within range. For example, referring to Figure 1 , UE 110a (serving as a Tx UE) may transmit data to UE 110b or UE 110c (serving as a Rx UE).

[0049] As specified in 3GPP 38.215, the IEEE 802.11 WLAN RSSI as used in the RRC specification

[10] refers to the RSSI measured from a beacon, DMG beacon, or FILS discovery frame (in passive scanning mode) or from a probe response frame (in active scanning mode) as defined in the IEEE 802.11 specification

[11] . The received signal strength indicator (RSSI) comprises the linear average of the total received power (in [W]) observed only over the configured OFDM symbols and in the measurement bandwidth indicated by higher layers or corresponding to the channel bandwidth defined in clause 4 of TS 37.213

[17] , where the channel has a center frequency configured by the UE according to the ARFCN-valueNR from all sources (including co-channel serving and non-serving cells, adjacent channel interference, thermal noise, etc.). [W] means "Watt", which is a unit of power.

[0050] As specified in 3GPP TS 38.215, the Sidelink Received Signal Strength Indicator (SL RSSI) is defined as the linear average of the total received power (in [W]) observed in the configured subchannels in the OFDM symbols of the time slot configured for PSCCH and PSSCH, starting from the 2nd OFDM symbol.

[0051] The sidelink channel occupancy rate (SL CR) is evaluated at time slot n, which is defined as the total number of subchannels used for its transmission in time slot [na,n-1] and granted in time slot [n,n+b] divided by the total number of configured subchannels in the transmission pool on [na,n+b]. The SL CR is evaluated for each (re)transmission.

[0052] The SL channel busy rate (SL CBR) measured in time slot n is defined as the portion of the subchannels in the resource pool whose SL RSSI measured by the UE exceeds a (pre-)configured threshold sensed over the CBR measurement window [na,n-1] (e.g. Figure 3), where a is equal to 100 or 100·2 according to the higher layer parameter sl-TimeWindowSizeCBR μ timeslots. When the UE is configured to perform partial sensing by higher layers (including when SL DRX is configured), the SL RSSI is measured in timeslots in which the UE performs partial sensing and the UE performs PSCCH or PSSCH reception within the CBR measurement window. The calculation of the SL CBR is limited to the timeslots in which the SL RSSI is measured. If the number of SL RSSI measurement timeslots within the CBR measurement window is below a (pre-)configured threshold, the (pre-)configured SL CBR value is used.

[0053] Based on the old SL RSSI definition in TS 38.215, SL RSSI is defined as the linear average of the total received power (in [W]) observed in the configured subchannels in the OFDM symbols of the time slot configured for PSCCH and PSSCH, starting from the 2nd OFDM symbol. This is because the measuring UE assumes that only 3GPP system transmissions are performed on the sidelink, that is, the linear average of the total received power is not generated by other systems or radio access technologies (RATs). And valid PSCCH and PSSCH transmissions are performed from the 2nd OFDM symbol of the time slot (here, the first OFDM symbol of the time slot is the AGC symbol). Based on the above, the following problems need to be solved:

[0054] (1) In the SL-U scenario, potential sidelink transmissions come not only from 3GPP systems (e.g., vehicle UEs or commercial UEs), but also from other systems or other RATs (e.g., WLAN APs). That is, the linear average of the total received power used for SL RSSI measurement may also include power transmitted from, for example, WiFi nodes. Therefore, the legacy SL RSSI definition cannot distinguish 3GPP from other systems or RATs, which may have an impact on some sidelink mechanisms (e.g., CBR reporting and related scheduling or configuration in Mode 1 and congestion control in Mode 2).

[0055] (2) If supported, the legacy SL RSSI measurement starting from the 2nd OFDM symbol within a slot (to the end of PSCCH and PSSCH transmission, e.g., the 13th OFDM symbol, where the 14th OFDM symbol is a GP symbol) may not be reasonable. For example, if the potential SL-U transmission starts from the 7th OFDM symbol (the 7th OFDM symbol is the AGC symbol for PSCCH and PSSCH transmission, PSCCH and PSSCH transmission starts from the 7th OFDM symbol to the 13th OFDM symbol, and the 14th OFDM symbol is a GP symbol), the SL RSSI measurement starting from the 2nd OFDM symbol is not accurate.

[0056] In view of the above, it is necessary to enhance the old SL RSSI measurement definition. Embodiments of the present disclosure provide solutions for solving the above problems. For example, some embodiments of the present disclosure define the SL RSSI measurement of SL-U to distinguish the SL RSSI between 3GPP and other systems or RATs. Some embodiments of the present disclosure enhance the definition of the SL RSSI of the structure with multiple starting points within a time slot. Some embodiments of the present disclosure define a default value for the SL CBR measurement value (if the total number of SL RSSI measurement time slots within the CBR measurement window is lower than a (pre) configured threshold) and a threshold for the minimum number of SL RSSI measurement time slots. In an embodiment of the present disclosure, sidelink transmission (a) may be performed on an unlicensed spectrum. More details about embodiments of the present disclosure will be described below in conjunction with the accompanying drawings.

[0057] Figure 2 Flowchart illustrating an exemplary procedure related to SL RSSI on unlicensed spectrum according to some embodiments of the present disclosure. The exemplary procedure 200 may be performed by a UE (e.g., Figure 1 In some embodiments, the exemplary procedure 200 may be performed by an Rx UE on a sidelink. Although described with respect to a UE or an Rx UE, it should be understood that other devices may be configured to perform the same. Figure 2 A similar approach to the one used in this paper.

[0058] refer to Figure 2 In operation 201, a UE (eg, Figure 1 UE 110a or Figure 2 UE 1) in A and 2B may receive at least one of the following:

[0059] (1) From network nodes (e.g. Figure 1 1. For simplicity, the configuration is denoted as configuration #1. Configuration #1 may include a threshold value (denoted as threshold #1) related to the linear average value of the total received power within a time unit. The time unit may be one of the following: a time slot, a mini-time slot, and a sub-time slot.

[0060] Threshold #1 may have a fixed value, a configured value, or a pre-configured value. In some embodiments, threshold #1 is (pre-)configured per SCS and / or per resource pool.

[0061] (2) SCI transmission within a time unit on the sidelink in the unlicensed band.

[0062] (3) Sequence transmission within a time unit on the sidelink in the unlicensed band.

[0063] In operation 202, the UE may determine whether to observe the SLRSSI within a time unit of a sidelink on an unlicensed band.

[0064] In some embodiments, the UE may measure a linear average (denoted as linear average #1) of the total received power observed in a frequency domain resource (denoted as frequency domain resource #1) and a time domain resource (denoted as time domain resource #1) within a time unit. The UE may measure another linear average (denoted as linear average #2) of the total received power observed in the frequency domain resource #1 and another time domain resource (denoted as time domain resource #2) within the time unit. For specific examples, Figure 4 and 5 The embodiments are described as follows.

[0065] In an embodiment, the linear average #1 and / or the linear average #2 may be measured starting from “a symbol after the start symbol of the time unit” or “a configured start point after the start symbol of the time unit”.

[0066] In an embodiment, time domain resource #1 includes one or more symbols after the start symbol of the time unit and before time domain resource #2 in the time unit. Time domain resource #2 includes one or more symbols after time domain resource #1 and before the end symbol of the time unit.

[0067] In an embodiment, frequency domain resource #1 may include at least one of the following: one or more subchannels; one or more interlaces; one or more RB sets; or a measurement bandwidth.

[0068] In some embodiments, after measuring linear average #1 and linear average #2, the UE may determine whether the difference between linear average #1 and linear average #2 is equal to or less than threshold #1. In response to the difference being equal to or less than threshold #1, the UE may determine to observe the SL RSSI within the time unit.

[0069] In an embodiment, in response to determining the observed SL RSSI, the UE may determine “another linear average value of the total received power within the time unit” (denoted as linear average value #3) as the SL RSSI. For example, linear average value #3 may be:

[0070] (1) Linear average #1;

[0071] (2) Linear average #2;

[0072] (3) the linear average of Linear Average #1 and Linear Average #2; or

[0073] (4) The linear average of the total received power within the time unit, that is, the linear average of the total received power observed in the entire time unit.

[0074] In an embodiment, the linear average #3 is measured from the "symbol after the start symbol of the time unit" or the "configured start point after the start symbol of the time unit". Figure 4 and 5 The embodiments are described as follows.

[0075] In some embodiments, the UE may determine whether at least one of an SCI transmission or a sequence transmission is transmitted within a time unit. In response to detecting at least one of an SCI transmission or a sequence transmission transmitted within a time unit, the UE may determine to observe the SL RSSI within the time unit. In an embodiment, in response to determining to observe the SL RSSI, the UE may measure "a linear average of the total received power in the frequency domain resources within the time unit" as the SL RSSI. For example, the frequency domain resources include at least one of the following: one or more subchannels; one or more interlaces; one or more RB sets; or a measurement bandwidth. A specific example is described in Embodiment 2 as follows.

[0076] In some embodiments, configuration #1 includes at least one of the following:

[0077] (1) Another threshold value (denoted as threshold #2) related to the linear average value of the total received power sensed over the CBR measurement window of the sidelink on the unlicensed band. For example, threshold #2 is a (pre-)configured threshold value used over the CBR measurement window [na,n-1], such as Figure 3 Displayed in.

[0078] (2) The default value of the sidelink CBR measurement value for the sidelink on the unlicensed band, such as DefaultCBR-SL-U.

[0079] (3) The minimum total number of RSSI measurement time units for the sidelink on the unlicensed band, eg, MinNumRssiMeasurementTimeUnits-SL-U.

[0080] In some embodiments, in order to determine whether to observe SL RSSI, the UE may receive information about the WLAN RSSI measurement time unit within the CBR measurement window, and may determine whether there is a SL RSSI measurement time unit by excluding the WLAN RSSI measurement time unit from the RSSI measurement time unit within the CBR measurement window. A specific example is described in Embodiment 1 as follows.

[0081] In some embodiments, the UE may determine whether the total number of SL RSSI measurement time units within the CBR measurement window is less than a "minimum total number", where the linear average of the total received power of the SL RSSI within each of the SL RSSI measurement time units exceeds threshold #2. In response to the total number being less than the minimum total number, the UE may set the total number to a default value. Figure 3 The embodiments are described as follows.

[0082] The details described in all the above embodiments of the present disclosure apply to Figure 2 Those skilled in the art will appreciate that the sequence of operations in the exemplary process 200 may be changed and some operations in the exemplary process 200 may be eliminated or modified without departing from the spirit and scope of the present disclosure.

[0083] Some other embodiments of the present application provide for a network node (e.g., Figure 1 1. Although described with respect to a network node, it should be understood that other devices may be configured to perform similar methods. In this exemplary procedure, the network node may transmit a configuration (denoted as configuration #1) for a sidelink configuration on an unlicensed band to the UE.

[0084] Configuration #1 may include a threshold value (denoted as threshold #1) associated with a linear average value of total received power within a time unit. The time unit may be one of the following: a time slot, a mini-time slot, and a sub-time slot. In response to the difference between "the linear average value of the total received power observed in the frequency domain resource (denoted as frequency domain resource #1) and the time domain resource (denoted as time domain resource #1) within the time unit" and "the linear average value of the total received power observed in the frequency domain resource #1 and another time domain resource (denoted as time domain resource #2) within the time unit" being equal to or less than threshold #1, the UE determines that the SL RSSI is to be observed within the time unit.

[0085] In some embodiments, threshold #1 has a fixed value, a configured value, or a preconfigured value. In some embodiments, threshold #1 can be configured or preconfigured per SCS and / or per resource pool.

[0086] In some embodiments, frequency domain resource #1 includes at least one of: one or more subchannels; one or more interlaces; one or more RB sets; or a measurement bandwidth.

[0087] In an embodiment, time domain resource #1 includes one or more symbols after the start symbol of the time unit and before time domain resource #2 within the time unit; and time domain resource #2 includes one or more symbols after time domain resource #1 and before the end symbol of the time unit.

[0088] In an embodiment, configuration #1 includes at least one of the following:

[0089] (1) another threshold value (denoted as Threshold #2) related to the linear average value of the total received power sensed over the CBR measurement window of the sidelink on the unlicensed band;

[0090] (2) a default value for the sidelink CBR measurement for the sidelink on the unlicensed band, e.g., DefaultCBR-SL-U; or

[0091] (3) The minimum total number of RSSI measurement time units for the sidelink on the unlicensed band, eg, MinNumRssiMeasurementTimeUnits-SL-U.

[0092] In some embodiments, in response to "the total number of SL RSSI measurement time units within the CBR measurement window" being less than a minimum total number, the UE sets the total number to a default value.

[0093] The following describes Figure 2 The exemplary procedure 200 shown in or a specific embodiment of the above exemplary procedure performed by a network node.

[0094] Generally speaking, for unlicensed bands, if the 3GPP system accesses the channel based on the listen-before-talk (LBT) result (i.e., LBT is successful) to perform slot or mini-slot or sub-slot transmission, then the sidelink transmission will start from the slot or mini-slot or sub-slot boundary. However, for other systems or RATs, after the channel access procedure, if LBT is successful, the transmission is not based on slots or mini-slots or sub-slots, that is, from the perspective of the 3GPP system, the transmission of other systems or other RATs may start from each symbol. Therefore, within a slot or mini-slot or sub-slot, the measured linear average of the total received power on each symbol may be different.

[0095] Based on the above, “separately measuring the linear average of the total received power of the subsequent first symbol and other symbols” can help distinguish the 3GPP system from other systems or RATs within a time slot, mini-time slot or sub-time slot.

[0096] Figure 3 An exemplary diagram illustrating SL RSSI measurements in a CBR measurement window according to some embodiments of the present disclosure. Figure 3 In an embodiment, DefaultCBR-SL-U and MinNumRssiMeasurementTimeUnits-SL-U may be configured for SL-U.

[0097] (1) DefaultCBR-SL-U: If the total number of SL RSSI measurement time units over the CBR measurement window is lower than MinNumRssiMeasurementTimeUnits-SL-U, then higher layers indicate or (pre-)configure the default value of the SL CBR measurement value for UEs configured to perform transmissions on the unlicensed band. That is, the number of SL RSSI measurement time units within the CBR measurement window is lower than a (pre-)configured threshold.

[0098] (2) MinNumRssiMeasurementTimeUnits-SL-U: A higher layer indicates or (pre-)configures a threshold for the minimum number of SL RSSI measurement time units over a CBR measurement window within which SL RSSI is measured for a UE configured to perform transmissions on an unlicensed band.

[0099] In different embodiments of the present disclosure, MinNumRssiMeasurementTimeUnits-SL-U may be referred to as MinNumRssiMeasurementSlots-SL-U, MinNumRssiMeasurementMiniSlots-SL-U, MinNumRssiMeasurementSubSlots-SL-U, etc.

[0100] like Figure 3 As shown in , the CBR measurement window is [na,n-1] in the time domain, where a is equal to 100 or 100·2, according to the higher layer parameter sl-TimeWindowSizeCBR μ time units. That is, the CBR measurement window starts at "time unit na" before "time unit n" and ends at "time unit n-1". The CBR measurement window may include SL RSSI measurement time units and / or WLAN RSSI measurement time units. The measurement time unit may be a time slot, a mini-time slot or a sub-time slot.

[0101] exist Figure 3In some embodiments of the present invention, the SL CBR measured in "time unit n" is defined as the portion of the subchannels in the resource pool for which the SL RSSI measured by the UE exceeds a (pre)configured threshold (e.g., threshold #2) sensed over the CBR measurement window [na,n-1]. When the UE is configured to perform partial sensing by higher layers (including when SL DRX is configured), the SL RSSI is measured in time units in which the UE performs partial sensing and the UE performs PSCCH or PSSCH reception within the CBR measurement window. The calculation of the SL CBR is limited to the time units in which the SL RSSI is measured. If the total number of SL RSSI measurement time units within the CBR measurement window is lower than the (pre)configured threshold, then the (pre)configured SL CBR value is used, e.g., DefaultCBR-SL-U.

[0102] exist Figure 3 In an embodiment (denoted as Embodiment 1 for simplicity), the total number of SL RSSI measurement time units may be calculated as follows. The UE receives a WLAN RSSI of one time unit from a higher layer, and the UE observes the SL-RSSI measurement value per time unit within the CRB measurement window. The UE may exclude the time units in which the WLAN RSSI is provided, and then the UE may perform CBR calculation based on the time units in which the observed SL-RSSI exceeds a (pre)configured threshold (e.g., Threshold #2).

[0103] For example, Figure 3 , in which the WLAN RSSI is provided in five WLAN RSSI measurement time units within the CBR measurement window, and three SL RSSI measurement time units are below the power threshold (e.g., threshold #2). In the case where the total number of "SL RSSI measurement time units that are not below the power threshold within the CBR measurement window" is less than MinNumRssiMeasurementTimeUnits-SL-U, the UE's SL CBR measurement value is set to the default value, i.e., DefaultCBR-SL-U. In the case where the total number of "SL RSSI measurement time units that are not less than the power threshold within the CBR measurement window" is not less than MinNumRssiMeasurementTimeUnits-SL-U, the actual total number of SL RSSI measurement time units is determined as the UE's SL CBR measurement value.

[0104] Figure 4 An exemplary flow chart illustrating SL RSSI measurements according to some embodiments of the present disclosure. Figure 4 The embodiments refer to a solution for differentiating SL RSSI measurements of 3GPP from other RATs for slot-based SL-U. Figure 4The time unit in the embodiment of the present disclosure is a time slot in the time domain. The details described in all the above embodiments of the present disclosure apply to Figure 4 The embodiments shown in .

[0105] Figure 4 The frequency domain resources in one slot in the time domain (i.e., frequency domain resource #1) are shown, and the slot contains 14 symbols, i.e., symbol #0 to symbol #13. Symbol #0 is an automatic gain control (AGC) symbol. Symbol #13 is a guard period (GP) symbol. For sidelink communications on the unlicensed band (i.e., SL-U), the SL RSSI is defined as the linear average of the total received power (in [W]) observed in frequency domain resource #1 and time domain resource #1 and time domain resource #2. Specifically:

[0106] (1) Frequency domain resource #1 may be a (pre-)configured subchannel or interlace or RB set or measurement bandwidth.

[0107] (2) Time domain resource #1 may be "one or more symbols starting from the start symbol for PSCCH and PSSCH transmission" before time domain resource #2 in the time slot. For example, the start symbol of time domain resource #1 is symbol #1, such as Figure 4 The length of time domain resource #1 and / or the end symbol of time domain resource #1 may be (pre)configured.

[0108] (3) Time domain resource #2 may be one or more symbols after time domain resource #1 in the time slot. For example, the end symbol of time domain resource #2 is the last symbol used for PSCCH and PSSCH transmission, such as symbol #12. Figure 4 The length of time domain resource #2 and / or the starting symbol of time domain resource #2 may be (pre)configured.

[0109] In some embodiments, the total number of symbols in time domain resource #1, time domain resource #1 and / or time domain resource #2 may be (pre)configured by higher layer signaling. In some other embodiments, the total number of symbols in time domain resource #1 and / or time domain resource #2 may be associated with the SCS, for example, 1 symbol for 15kHz SCS, 2 symbols for 30kHz SCS, 3 symbols or 4 symbols for 60kHz SCS.

[0110] exist Figure 4 In some embodiments, a linear average #1 of the total received power (in [W]) is observed in frequency domain resource #1 and time domain resource #1. A linear average #2 of the total received power (in [W]) is observed in frequency domain resource #1 and time domain resource #2.

[0111] If the linear average value #1 of the total received power (in [W]) is equal to the linear average value #2 of the total received power (in [W]), or if the "difference between the linear average value #1 of the total received power (in [W]) and the linear average value #2 of the total received power (in [W])" is less than a fixed or (pre)configured difference or offset value (e.g., threshold #1), then the SL RSSI may be defined as the linear average value of the total received power (in [W]) observed in frequency domain resource #1 and time domain resource #1 and / or observed in frequency domain resource #1 and time domain resource #2. In other words, the SL RSSI may be defined as the linear average value #1 of the total received power, or the linear average value #2 of the total received power, or "the linear average value #1 of the total received power and the linear average value #2 of the total received power".

[0112] Next, according to Figure 3 In an embodiment, the UE may calculate or determine the SL CBR measurement value within the CBR measurement window of the UE based on DefaultCBR-SL-U and MinNumRssiMeasurementTimeUnits-SL-U.

[0113] exist Figure 4 In some embodiments, higher layers may indicate the (pre-)configured total number of symbols for time domain resource #1 and / or time domain resource #2. Figure 4 In some embodiments, a higher layer may indicate a (pre-)configured difference or offset value (e.g., threshold #1) for determining the difference between a linear average value #1 of the total received power (in [W]) and a linear average value #2 of the total received power (in [W]).

[0114] Figure 5 Another exemplary flow chart illustrating SL RSSI measurement according to some embodiments of the present disclosure. Figure 5 The embodiments refer to a solution for differentiating SL RSSI measurements of 3GPP from other RATs for SL-U based on mini-slots or sub-slots. Figure 5 The time unit in the embodiment of the present disclosure is a mini-time slot or a sub-time slot in the time domain. The details described in all the above embodiments of the present disclosure are applicable to Figure 5 The embodiments shown in .

[0115] For example, Figure 5The frequency domain resources (i.e., frequency domain resource #1) in two mini-slots in the time domain are shown, and the two mini-slots may also be referred to as two sub-slots. For example, one mini-slot includes 7 symbols, i.e., symbol #0 to symbol #6. Symbol #0 is an AGC symbol. Symbol #6 is a GP symbol. Another mini-slot also includes 7 symbols, i.e., symbol #7 to symbol #13. Symbol #7 is an AGC symbol. Symbol #13 is a GP symbol. It should be understood by those skilled in the art that, without departing from the spirit and scope of the present disclosure, in different embodiments, the total number of mini-slots or sub-slots within a slot and / or the total number of symbols in a mini-slot or sub-slot may be changed or configured differently.

[0116] exist Figure 5 In an embodiment of the present invention, for sidelink communications on the unlicensed band (i.e., SL-U), the SL RSSI in each mini-slot is defined as the linear average of the total received power (in [W]) observed in frequency domain resource #1 and time domain resource #1 and time domain resource #2. Figure 4 Similar to the embodiment, Figure 5 The frequency domain resource #1, time domain resource #1 and time domain resource #2 in the embodiment of have the following definitions, and the difference is Figure 5 The time unit in the embodiments is a mini-slot or a sub-slot.

[0117] (1) Frequency domain resource #1 may be a (pre-)configured subchannel or interlace or RB set or measurement bandwidth.

[0118] (2) Time domain resource #1 may be "one or more symbols starting from the start symbol for PSCCH and PSSCH transmission" before time domain resource #2 in a mini-slot or sub-slot. For example, the start symbol of time domain resource #1 is symbol #1, such as Figure 5 The length of time domain resource #1 and / or the end symbol of time domain resource #1 can be (pre-)

[0119] Configuration.

[0120] (3) Time domain resource #2 may be one or more symbols after time domain resource #1 in a mini-slot or sub-slot. For example, the end symbol of time domain resource #2 is the last symbol used for PSCCH and PSSCH transmission, such as symbol #12. Figure 5 The length of time domain resource #2 and / or the starting symbol of time domain resource #2 may be (pre-)

[0121] Configuration.

[0122] In such Figure 5In the specific embodiment shown in , in one mini-slot including symbol #0 to symbol #6, time domain resource #1 includes symbol #1, and time domain resource #2 includes symbol #2 to symbol #5. In another mini-slot including symbol #7 to symbol #13, time domain resource #1 includes symbol #8, and time domain resource #2 includes symbol #9 to symbol #12. In other words, in addition to the starting symbol at symbol #0 within the slot for PSCCH and PSSCH transmission (i.e., for one mini-slot), an additional starting symbol is (pre-)configured for SL-U at symbol #7 (i.e., for another mini-slot). For example, as Figure 5 As shown in FIG. 1 , for one mini-slot, the SL RSSI measurement starts from the 2nd OFDM symbol (ie, symbol #1), and for another mini-slot, the SL RSSI measurement starts from the 9th OFDM symbol (ie, symbol #8).

[0123] In such Figure 5 In other specific embodiments shown in , the total number of symbols in time domain resource #1 and time domain resource #2 in each mini-slot or sub-slot may be configured differently without departing from the spirit and scope of the present disclosure.

[0124] In such Figure 5 In the above specific embodiment shown in , a linear average value #1 of the total received power (in [W]) is observed in the frequency domain resource #1 and the time domain resource #1, for example, for a mini-time slot measured as symbol #1, such as Figure 5 or for another mini-slot measured as symbol #8, as shown in Figure 5 Displayed in.

[0125] A linear average #2 of the total received power (in [W]) observed in frequency domain resource #1 and time domain resource #2, for example, measured from symbol #2 to symbol #5 for one mini-slot, such as Figure 5 or for another mini-slot measured as symbol #9 to symbol #12, as shown in Figure 5 Displayed in.

[0126] exist Figure 5In each mini-slot in the mini-slot, if the linear average value #1 of the total received power (in [W]) is equal to the linear average value #2 of the total received power (in [W]), or if the “difference between the linear average value #1 of the total received power (in [W]) and the linear average value #2 of the total received power (in [W])” is less than a fixed or (pre)configured difference or offset value (e.g., threshold #1), then the SL RSSI in the mini-slot may be defined as the linear average value of the total received power (in [W]) observed in frequency domain resource #1 and time domain resource #1 and / or observed in frequency domain resource #1 and time domain resource #2. That is, the SL RSSI in the mini-slot may be defined as the linear average value #1 of the total received power, or the linear average value #2 of the total received power, or the “linear average of the linear average value #1 of the total received power and the linear average value #2 of the total received power”.

[0127] Next, according to Figure 3 In an embodiment, the UE may calculate or determine the SL CBR measurement value of each mini-slot or sub-slot within the CBR measurement window of the UE based on the DefaultCBR-SL-U and the MinNumRssiMeasurementTimeUnits-SL-U.

[0128] exist Figure 5 In some embodiments, higher layers may indicate the (pre-)configured total number of symbols for time domain resource #1 and / or time domain resource #2 in a mini-slot or sub-slot. Figure 5 In some embodiments, a higher layer may indicate a (pre-)configured difference or offset value (e.g., threshold #1) for determining the difference between a linear average value #1 of the total received power (in [W]) and a linear average value #2 of the total received power (in [W]).

[0129] The following describes Figure 2 The exemplary procedure 200 shown in FIG. 1 or the specific embodiment 2 of the exemplary procedure performed by the UE. The UE may be as follows: Figure 1 UE 102 is shown and described in FIG.

[0130] In Embodiment 2, SCI and / or sequence transmissions are decoded to distinguish 3GPP systems from other RATs. Specifically, the UE may detect potential SCI transmissions and / or sequence transmissions (eg, DMRS) to determine whether there is a sidelink transmission performed at a slot boundary, a mini-slot boundary, or a sub-slot boundary.

[0131] For example, for a starting point (e.g. Figure 4), if any SCI transmission and / or sequence transmission is detected, then the SL RSSI is defined as the linear average of the total received power (in [W]) observed in the configured subchannel or interlace or RB set or measurement bandwidth of the slot, mini-slot or sub-slot configured for PSCCH and PSSCH, starting from the 2nd OFDM symbol, or from the additional configured starting point for PSCCH and PSSCH after the AGC symbol (i.e., symbol #1). Then, according to Figure 3 In an embodiment, the UE may calculate or determine the SL CBR measurement value of each mini-slot within the CBR measurement window of the UE based on DefaultCBR-SL-U and MinNumRssiMeasurementTimeUnits-SL-U.

[0132] For the case of two starting points (e.g. Figure 5 If any SCI transmission and / or sequence transmission is detected, then in addition to the 2nd OFDM symbol for PSCCH and PSSCH transmission, the additional starting point for AGC / PSCCH / PSSCH transmission (e.g., for another mini-slot) is symbol #7, and the SL RSSI can be observed from the 8th OFDM symbol, as shown in FIG. Figure 5 Then, according to Figure 3 In an embodiment, the UE may calculate or determine the SLCBR measurement value of each mini-time slot within the UE CBR measurement window based on DefaultCBR-SL-U and MinNumRssiMeasurementTimeUnits-SL-U.

[0133] Figure 6 6 is a block diagram illustrating an exemplary apparatus 600 according to some embodiments of the present application. Figure 6 6, the apparatus 600 may include at least one processor 606 and at least one transceiver 602 coupled to the processor 606. Although elements such as at least one transceiver 602 and processor 606 are described in the singular in this figure, the plural form is contemplated unless limitation to the singular form is explicitly stated. In some embodiments of the present application, the transceiver 602 may be divided into two devices, such as a receive circuit system and a transmit circuit system. In some embodiments of the present application, the apparatus 600 may further include an input device, a memory, and / or other components.

[0134] In some embodiments of the present application, the device 600 may be a UE or a network node (eg, a BS). The transceiver 602 and the processor 606 may interact with each other to execute the above (eg, Figures 1 to 5 Operations regarding a UE or a network node as described in any of the foregoing.

[0135] In some embodiments of the present application, the device 600 may further include at least one non-transitory computer-readable medium. For example, in some embodiments of the present disclosure, the non-transitory computer-readable medium may store thereon computer-executable instructions to enable the processor 606 to implement the method described above with respect to the UE or the network node (e.g., BS). For example, when the computer-executable instructions are executed, the processor 606 interacts with the transceiver 602 to perform Figures 1 to 5 The operations of the UE or network node described in.

[0136] It will be appreciated by those of ordinary skill in the art that the operations or steps of the methods described in conjunction with the aspects disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. The software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. Additionally, in some aspects, the operations or steps of the methods may reside as one or any combination or set of codes and / or instructions on a non-transitory computer-readable medium, which may be incorporated into a computer program product.

[0137] In this file, the term "includes / including" or any other variation thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment comprising a series of elements not only includes those elements, but also may include other elements that are not explicitly listed or inherent to this process, method, article or equipment. In the absence of more constraints, the element starting with "a / an" or the like does not exclude the presence of additional identical elements in the process, method, article or equipment comprising the element. In addition, the term "another" is defined as at least the second or more. As used herein, the term "having" and the like are defined as "including". For example, the expression of "A and / or B" or "at least one of A and B" may include any and all combinations of words listed together with the expression. For example, the expression "A and / or B" or "at least one of A and B" may include A, B or both A and B. The words "first", "second", etc. are only used to clearly illustrate the embodiments of the present application, and are not used to limit the essence of the present application.

Claims

1. A user equipment UE, comprising: Transceiver; and a processor coupled to the transceiver, wherein the processor is configured to: Receiving, via the transceiver, at least one of: a configuration from a network node, wherein the configuration comprises a first threshold value related to a linear average of a total received power within a time unit, and wherein the time unit is one of: a time slot, a mini-time slot, and a sub-time slot; a sidelink control information SCI transmission within said time unit on a sidelink on an unlicensed frequency band; or a sequence of transmissions within the time unit on the sidelink on the unlicensed frequency band; and A determination is made as to whether a sidelink received signal strength indicator, SL RSSI, is observed within the time unit of the sidelink on the unlicensed frequency band.

2. The UE of claim 1, wherein the processor of the UE is configured to: measuring a first linear average of total received power observed in a first frequency domain resource and a first time domain resource within the time unit; measuring a second linear average of total received power observed in the first frequency domain resource and the second time domain resource within the time unit; determining whether a difference between the first linear average value of total received power and the second linear average value of total received power is equal to or less than the first threshold; and In response to the difference being equal to or less than the first threshold, it is determined that the SLRSSI is observed within the time unit.

3. The UE according to claim 1 or claim 2, wherein the first threshold has a fixed value, a configured value or a preconfigured value.

4. The UE according to any one of claims 1 to 3, wherein the first threshold is configured or preconfigured per subcarrier spacing (SCS) or per resource pool.

5. The UE of claim 2, wherein in response to determining to observe the SL RSSI, the processor of the UE is configured to determine a third linear average of total received power within the time unit as the SL RSSI to be one of: the first linear average value of the total received power; the second linear average value of the total received power; a linear average of the first linear average of the total received power and the second linear average of the total received power; and The linear average of the total received power within the time unit.

6. The UE according to claim 2, wherein: The first time domain resource includes one or more symbols after the start symbol of the time unit and before the second time domain resource within the time unit; and The second time domain resource includes one or more symbols after the first time domain resource and before the end symbol of the time unit.

7. The UE of claim 1, wherein the processor of the UE is configured to: Determine whether to transmit at least one of sidelink control information SCI transmission or sequence transmission within the time unit; and Responsive to detecting the at least one of the SCI transmission or the sequence transmission transmitted within the time unit, determining to observe the SL RSSI within the time unit. 8 . The UE of claim 7 , wherein in response to determining to observe the SL RSSI, the processor of the UE is configured to measure a third linear average of total received power in the first frequency domain resource within the time unit as the SL RSSI.

9. The UE according to claim 2 or claim 8, wherein the first frequency domain resource comprises at least one of the following: one or more sub-channels; one or more interlaces; One or more resource block (RB) sets; or Measure bandwidth.

10. The UE according to any one of claims 2, 5 and 8, wherein at least one of the first linear average of total received power, the second linear average of total received power or the third linear average of total received power is measured from: the symbol following the starting symbol of the time unit; or A configured starting point after the start symbol of the time unit.

11. The UE according to any one of claims 1 to 10, wherein the configuration comprises at least one of the following: a second threshold value associated with a linear average value of a total received power sensed per time unit over a channel busy rate (CBR) measurement window of the sidelink on the unlicensed frequency band; a default value for a sidelink CBR measurement for said sidelink on said unlicensed band; or The minimum total number of RSSI measurement time units for the sidelink on the unlicensed band.

12. The UE according to claim 1 or claim 11, wherein in order to determine whether to observe the SL RSSI, the processor of the UE is configured to: receiving information about a wireless local area network WLAN RSSI measurement time unit within a channel busy rate CBR measurement window; and It is determined whether there is a SL RSSI measurement time unit by excluding the WLAN RSSI measurement time unit from the RSSI measurement time unit within the CBR measurement window.

13. The UE according to claim 11 or claim 12, wherein the processor of the UE is configured to: determine whether the total number of SL RSSI measurement time units within the CBR measurement window is less than the minimum total number, wherein the linear average of the total received power of the SL RSSI within each of the SL RSSI measurement time units exceeds the second threshold; and In response to the total being less than the minimum total, the total is set to the default value.

14. A network node, comprising: Transceiver; and a processor coupled to the transceiver and configured to transmit, via the transceiver, to a user equipment (UE) a configuration for a sidelink configuration on an unlicensed band, wherein: The configuration includes a first threshold value associated with a linear average value of the total received power within the time unit; The time unit is one of: a time slot, a mini-time slot, and a sub-time slot; and In response to the difference between a first linear average of the total received power observed in the first frequency domain resources and the first time domain resources within the time unit and a second linear average of the total received power observed in the first frequency domain resources and the second time domain resources within the time unit being equal to or less than the first threshold, the UE determines to observe the SL RSSI within the time unit.

15. A method performed by a network node, comprising transmitting a configuration for a sidelink configuration on an unlicensed frequency band to a user equipment (UE), wherein: The configuration includes a first threshold value associated with a linear average value of the total received power within the time unit; The time unit is one of: a time slot, a mini-time slot, and a sub-time slot; and In response to the difference between a first linear average of the total received power observed in the first frequency domain resources and the first time domain resources within the time unit and a second linear average of the total received power observed in the first frequency domain resources and the second time domain resources within the time unit being equal to or less than the first threshold, the UE determines to observe the SL RSSI within the time unit.

Images