US-12621860-B2 - Inter-user-equipment coordination for sidelink scheduling using multiple time-frequency occasions

US12621860B2US 12621860 B2US12621860 B2US 12621860B2US-12621860-B2

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first user equipment (UE) may receive, from a second UE, an inter-UE coordination (IUC) communication indicating multiple time-frequency occasions for at least one of a sidelink data communication or a sidelink feedback communication, the multiple time-frequency occasions being based at least in part on one or more parameters. The first UE may transmit, to the second UE or another UE, the sidelink data communication or the sidelink feedback communication using at least one time-frequency occasion of the multiple time-frequency occasions. Numerous other aspects are provided.

Inventors

Qing Li
Junyi Li
Hong Cheng

Assignees

QUALCOMM INCORPORATED

Dates

Publication Date: 20260505
Application Date: 20220330

Claims (20)

1 . A first user equipment (UE) for wireless communication, comprising: at least one memory; and at least one processor communicatively coupled with the at least one memory, the at least one processor configured to cause the first UE to: receive, from a second UE, an inter-UE coordination (IUC) communication indicating first multiple time-frequency occasions for a sidelink data communication and second multiple time-frequency occasions for a sidelink feedback communication, the first multiple time-frequency occasions and the second multiple time-frequency occasions being based at least in part on one or more parameters, consecutive time-frequency occasions of the second multiple time-frequency occasions being separated by one or more of a time gap or a frequency offset, and the one or more parameters being based at least in part on at least one of: a listen-before-talk (LBT) procedure success rate, a quantity of consecutive LBT failures, or a channel busy ratio (CBR); transmit, to the second UE or another UE, the sidelink data communication using at least one time-frequency occasion of the first multiple time-frequency occasions; and receive, from the second UE or the other UE, the sidelink feedback communication using at least one time-frequency occasion of the second multiple time-frequency occasions.
2 . The first UE of claim 1 , wherein the at least one processor is further configured to cause the first UE to: transmit, to the second UE, an IUC request communication requesting IUC information with multiple time-frequency occasions, wherein the IUC request communication indicates at least one of the one or more parameters.
3 . The first UE of claim 1 , wherein the first multiple time-frequency occasions include at least a first time-frequency occasion and a second time-frequency occasion, wherein the first time-frequency occasion and the second time-frequency occasion are duplexed in at least one of a time domain or a frequency domain.
4 . The first UE of claim 3 , wherein the first time-frequency occasion and the second time-frequency occasion are consecutive time-frequency occasions in the time domain, and wherein the first time-frequency occasion and the second time-frequency occasion are separated in the time domain by another time gap.
5 . The first UE of claim 3 , wherein the first time-frequency occasion and the second time-frequency occasion are consecutive time-frequency occasions in the frequency domain, and wherein the first time-frequency occasion and the second time-frequency occasion are separated in the frequency domain by another frequency offset.
6 . The first UE of claim 1 , wherein the IUC communication further indicates third multiple time-frequency occasions for a retransmission of the sidelink data communication.
7 . The first UE of claim 6 , wherein the first multiple time-frequency occasions and the third multiple time-frequency occasions include a same quantity of time-frequency occasions.
8 . The first UE of claim 1 , wherein the one or more parameters are based at least in part on at least one of: a quality of service (QoS) profile associated with the sidelink data communication, or a latency requirement associated with the sidelink data communication.
9 . The first UE of claim 1 , wherein the at least one processor is further configured to cause the first UE to: transmit, to the second UE, a sidelink radio resource control (RRC) communication indicating the one or more parameters.
10 . The first UE of claim 1 , wherein the at least one processor is further configured to cause the first UE to: transmit, to the second UE, a sidelink medium access control (MAC) control element (MAC-CE) communication indicating the one or more parameters, wherein the one or more parameters are activated, by the sidelink MAC-CE communication, from a set of parameters that are pre-configured, defined by a wireless communication standard, or indicated by a radio resource control (RRC) configuration.
11 . The first UE of claim 1 , wherein the one or more parameters include at least one of: a first quantity of the first multiple time-frequency occasions for transmissions of the sidelink data communication, a second quantity of time-frequency occasions for initial transmissions of the sidelink data communication, a third quantity of the second multiple time-frequency occasions for the sidelink feedback communication, a fourth quantity of time-frequency occasions for retransmissions of the sidelink data communication, a time gap between consecutive time-frequency occasions of the first multiple time-frequency occasions, or a frequency offset between consecutive time-frequency occasions of the first multiple time-frequency occasions.
12 . The first UE of claim 1 , wherein the one or more parameters include respective values or information associated with one or more quality of service (QoS) profiles or one or more LBT measurements.
13 . The first UE of claim 1 , wherein the at least one processor, to cause the first UE to transmit the sidelink data communication, is configured to cause the first UE to: measure, using the first multiple time-frequency occasions, one or more channel metrics as part of an LBT procedure; and transmit, using the first multiple time-frequency occasions, the sidelink data communication based at least in part on a measurement value of the one or more channel metrics satisfying a threshold.
14 . A first user equipment (UE) for wireless communication, comprising: at least one memory; and at least one processor communicatively coupled with the at least one memory, the at least one processor configured to cause the first UE to: receive an indication of one or more parameters associated with inter-UE coordination (IUC), the one or more parameters being based at least in part on at least one of: a listen-before-talk (LBT) procedure success rate, a quantity of consecutive LBT failures, or a channel busy ratio (CBR); transmit, to a second UE, an inter-UE coordination (IUC) communication indicating first multiple time-frequency occasions available to the second UE for a sidelink data communication and second multiple time-frequency occasions available to the second UE for a sidelink feedback communication, the first multiple time-frequency occasions and the second multiple time-frequency occasions being based at least in part on the one or more parameters, and consecutive time-frequency occasions of the second multiple time-frequency occasions being separated by one or more of a time gap or a frequency offset; receive, from the second UE, the sidelink data communication using at least one time-frequency occasion of the first multiple time-frequency occasions; and transmit, to the second UE, the sidelink feedback communication using at least one time-frequency occasion of the second multiple time-frequency occasions.
15 . The first UE of claim 14 , wherein the at least one processor is further configured to cause the first UE to: select the first multiple time-frequency occasions or the second multiple time-frequency occasions based at least in part on at least one of: the one or more parameters, a quality of service (QoS) profile associated with the sidelink data communication, or a latency requirement associated with the sidelink data communication.
16 . A method of wireless communication performed by a first user equipment (UE), comprising: receiving, from a second UE, an inter-UE coordination (IUC) communication indicating first multiple time-frequency occasions for a sidelink data communication and second multiple time-frequency occasions for a sidelink feedback communication, the first multiple time-frequency occasions and the second multiple time-frequency occasions being based at least in part on one or more parameters, consecutive time-frequency occasions of the second multiple time-frequency occasions being separated by one or more of a time gap or a frequency offset, and the one or more parameters being based at least in part on at least one of: a listen-before-talk (LBT) procedure success rate, a quantity of consecutive LBT failures, or a channel busy ratio (CBR); transmitting, to the second UE or another UE, the sidelink data communication using at least one time-frequency occasion of the first multiple time-frequency occasions; and receiving, from the second UE or the other UE, the sidelink feedback communication using at least one time-frequency occasion of the second multiple time-frequency occasions.
17 . The method of claim 16 , further comprising: transmitting, to the second UE, an IUC request communication requesting IUC information with multiple time-frequency occasions, wherein the IUC request communication indicates at least one of the one or more parameters.
18 . The method of claim 16 , wherein the first multiple time-frequency occasions include at least a first time-frequency occasion and a second time-frequency occasion, wherein the first time-frequency occasion and the second time-frequency occasion are duplexed in at least one of a time domain or a frequency domain.
19 . The method of claim 16 , wherein the IUC communication further includes third multiple time-frequency occasions for a retransmission of the sidelink data communication.
20 . The method of claim 19 , wherein the first multiple time-frequency occasions and the third multiple time-frequency occasions include a same quantity of time-frequency occasions or different quantities of time-frequency occasions.

Description

FIELD OF THE DISCLOSURE Aspects of the present disclosure generally relate to wireless communication and specifically, to techniques and apparatuses for inter-user-equipment (UE) coordination for sidelink scheduling using multiple time-frequency occasions. BACKGROUND Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (for example, bandwidth or transmit power). Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE). LTE/LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP). The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different UEs to communicate on a municipal, national, regional, or global level. New Radio (NR), which may be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the 3GPP. NR is designed to better support mobile broadband internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink, using CP-OFDM or single-carrier frequency division multiplexing (SC-FDM) (also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink, as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation. As the demand for mobile broadband access continues to increase, further improvements in LTE, NR, and other radio access technologies remain useful. In some cases, such as in a shared or unlicensed frequency band, a user equipment (UE) may contend against other devices (for example, other UEs or other wireless communication devices) for channel access before transmitting on a shared or unlicensed channel to reduce or prevent collisions on the shared or unlicensed channel. To contend for channel access, the UE may perform a channel access procedure, such as a listen-before-talk (LBT) procedure or another type of channel access procedure, for shared or unlicensed frequency band channel access. The channel access procedure may be performed to determine whether the physical channel (for example, the radio resources of the channel) are free to use or are busy (for example, in use by another wireless communication device). The channel access procedure may include sensing or measuring the physical channel during a channel access gap (which may also be referred to as a contention window (CW)) and determining whether the shared or unlicensed channel is free or busy based at least in part on the signals sensed or measured on the physical channel (for example, based at least in part on whether the measurement satisfies a threshold). If the UE determines that the channel access procedure was successful, the UE may perform one or more transmissions on the shared or unlicensed channel during a transmission opportunity, which may extend for a channel occupancy time (COT). In some cases, a first UE may exchange inter-UE coordination (IUC) communications with a second UE to identify time-frequency resources to be used to transmit a sidelink communication. Resource utilization associated with a sidelink unlicensed band (for example, whether a UE is able to transmit using given resources) may be impacted by a success rate of a channel access procedure, such as the LBT procedure. Therefore, whether a UE is able to transmit using given radio resources may not be deterministic or predictable because whether the UE is able to transmit using the given radio resources is based at least in part on the UE successfully performing the channel access procedure. Therefore, it may be difficult to determine or predict when a UE will be enabled to transmit a sidelink communication, feedback communication, or retransmission using an unlicensed or shared sidelink frequency band because of the unpredictable nature of the channel access procedure, such as the LBT procedure. In an IUC procedure, a transmitting UE may receive an IUC information communication indicating a single time-frequency occasion for an initial transmission of a sidelink communication. If the transmitting UE is unable to