Channel sounding with sub-band full-duplex (SBFD)

Abstract

Various aspects of the present disclosure relate to reference signal transmissions by a UE, such as techniques that determine reference signal frequency resources during SBFD operations (e.g., semi-static and / or dynamic SBFD operations). For example, a UE may include parameters for transmitting reference signals using SBFD and parameters for transmitting reference signals using non-SBFD. Therefore, the UE can transmit reference signals having knowledge of the frequency resources, enabling a wireless communications system to utilize reference signaling during SBFD operations, among other benefits.

Description

CHANNEL SOUNDING WITH SUB-BAND FULL-DUPLEX (SBFD)CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to U.S. Provisional Patent Application No. 63 / 574,171, filed on filed on April 3, 2024, entitled CHANNEL SOUNDING WITH SUBBAND FULL-DUPLEX (SBFD), which is hereby incorporated by reference its entirety.TECHNICAL FIELD

[0002] The present disclosure relates to wireless communications, and more specifically to channel sounding with sub-band full duplex (SBFD).BACKGROUND

[0003] A wireless communications system may include one or multiple network communication devices, such as base stations, which may support wireless communications for one or multiple user communication devices, which may be otherwise known as user equipment (UE), or other suitable terminology. The wireless communications system may support wireless communications with one or multiple user communication devices by utilizing resources of the wireless communications system (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers, or the like)). Additionally, the wireless communications system may support wireless communications across various radio access technologies including third generation (3G) radio access technology, fourth generation (4G) radio access technology, fifth generation (5G) radio access technology, among other suitable radio access technologies beyond 5G (e.g., sixth generation (6G)).

[0004] The wireless communications system may support time division duplexing (TDD), which involves splitting resources between uplink (UL) and downlink (DL) in a time domain. In some cases, one or more network communication devices or user communication devices may experience cross link interference (CLI). To mitigate or decrease CLI, the wireless communications system, including the one or more network communication devices or user communication devices, may support use of synchronized(e.g., phase and frequency synchronized) and / or identical patterns of TDD (also referred to herein as TDD patterns). In some other cases, the wireless communications system may support sub-band full-duplex (SBFD), where user communication devices can be configured to transmit UL signals in a sub-band on DL symbols, or transmit DL signals in a sub-band on UL symbols. Although the user communication devices may not have FD capabilities, network communication devices may be configured to include the FD capabilities and perform transmissions within the sub-bands.SUMMARY

[0005] An article “a” before an element is unrestricted and understood to refer to “at least one” of those elements or “one or more” of those elements. The terms “a,” “at least one,” “one or more,” and “at least one of one or more” may be interchangeable. As used herein, including in the claims, “or” as used in a list of items (e.g., a list of items prefaced by a phrase such as “at least one of’ or “one or more of’ or “one or both of’) indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Also, as used herein, the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on. Further, as used herein, including in the claims, a “set” may include one or more elements.

[0006] The present disclosure relates to methods, apparatuses, and systems that facilitate reference signal transmission by a UE. For example, a network may determine reference signal frequency resources during SBFD operations (e.g., semi-static and / or dynamic SBFD operations) for the UE. The UE may transmit reference signals having knowledge of the frequency resources.

[0007] A UE for wireless communication is described. The UE may be configured to, capable of, or operable to perform one or more operations as described herein. For example, the UE may comprise at least one memory and at least one processor coupled with the at least one memory and configured to cause the UE to receive a first configurationcomprising a first indication of a first set of frequency resources for a sounding reference signal (SRS), receive a second configuration comprising a second indication of a UL subband, determine a second set of frequency resources for the SRS based on the first configuration and the second configuration, and transmit the SRS on the second set of frequency resources in response to a condition associated with the second set of frequency resources being satisfied.

[0008] A method performed or performable by the UE is described. The method may comprise receiving a first configuration comprising a first indication of a first set of frequency resources for a sounding reference signal (SRS), receiving a second configuration comprising a second indication of a UL sub-band, determining a second set of frequency resources for the SRS based on the first configuration and the second configuration, and transmitting the SRS on the second set of frequency resources in response to a condition associated with the second set of frequency resources being satisfied.

[0009] A processor for wireless communication is described. The processor may be configured to, capable of, or operable to perform one or more operations as described herein. For example, the processor may comprise at least one memory and at least one controller coupled with the at least one memory and configured to cause the processor station to receive a first configuration comprising a first indication of a first set of frequency resources for a sounding reference signal (SRS), receive a second configuration comprising a second indication of a UL sub-band, determine a second set of frequency resources for the SRS based on the first configuration and the second configuration, and transmit the SRS on the second set of frequency resources in response to a condition associated with the second set of frequency resources being satisfied.

[0010] In some implementations of the UE, processor, and method described herein, one or more of the first set of frequency resources or the second set of frequency resources comprise physical resource blocks (PRBs).

[0011] In some implementations of the UE, processor, and method described herein, the second configuration is associated with a sub-band full-duplex (SBFD) operation for the UL sub-band.

[0012] In some implementations of the UE, processor, and method described herein, the first configuration or the second configuration indicates the condition associated with the second set of frequency resources.

[0013] In some implementations of the UE, processor, and method described herein, the condition associated with the second set of frequency resources is satisfied in response to a quantity of the second set of frequency resources being above a threshold quantity of frequency resources.

[0014] In some implementations of the UE, processor, and method described herein, the condition associated with the second set of frequency resources is satisfied in response to a quantity of resource elements (REs) on the second set of frequency resources being divisible by one or more prime numbers.

[0015] In some implementations of the UE, processor, and method described herein, the condition associated with the second set of frequency resources is satisfied in response to a quantity of REs on the second set of frequency resources being divisible by an integer.

[0016] In some implementations of the UE, processor, and method described herein, the UE, processor, and method may further be configured to, capable of, performed, performable, or operable to determine an error case when the condition associated with the second set of frequency resources is not satisfied.

[0017] In some implementations of the UE, processor, and method described herein, in response to determining the error case when the condition associated with the second set of frequency resources is not satisfied, the UE, processor, and method may further be configured to, capable of, performed, performable, or operable to cause the UE to not transmit the SRS, not transmit the SRS for one occasion, not transmit the SRS for a number of occasions, not transmit the SRS for a duration, not transmit the SRS until the condition is satisfied, transmit the SRS on a best-effort basis, disregard the first configuration or the first indication, or disregard the second configuration or the second indication.

[0018] In some implementations of the UE, processor, and method described herein, in response to determining that the condition associated with the second set of frequency resources is not satisfied, the UE, processor, and method may further be configured to,capable of, performed, performable, or operable to cause the UE to transmit an indication of a cause for the error, wherein the indication is transmitted in uplink control information (UCI) or a medium access control (MAC) control element (CE).

[0019] In some implementations of the UE, processor, and method described herein, the first configuration and the second configuration are a radio resource control (RRC) configuration.

[0020] In some implementations of the UE, processor, and method described herein, the UE, processor, and method may further be configured to, capable of, performed, performable, or operable to receive the second indication via a downlink control information (DCI) or a MAC CE.

[0021] A network entity for wireless communication is described. The network entity may be configured to, capable of, or operable to perform one or more operations as described herein. For example, the network entity may comprise at least one memory and at least one processor coupled with the at least one memory and configured to cause the network entity to transmit a first configuration comprising a first indication of a first set of frequency resources for an SRS, transmit a second configuration comprising a second indication of a UL sub-band, wherein a second set of frequency resources for the SRS is based on the first configuration and the second configuration, and receive the SRS on the second set of frequency resources in response to a condition associated with the second set of frequency resources being satisfied.

[0022] A method performed or performable by the network entity is described. The method may comprise transmitting a first configuration comprising a first indication of a first set of frequency resources for an SRS, transmitting a second configuration comprising a second indication of a UL sub-band, wherein a second set of frequency resources for the SRS is based on the first configuration and the second configuration, and receiving the SRS on the second set of frequency resources in response to a condition associated with the second set of frequency resources being satisfied.

[0023] In some implementations of the network entity and method described herein, the network entity and method may further be configured to, capable of, performed, performable, or operable to transmit the second indication via DCI or a MAC CE.

[0024] A UE for wireless communication is described. The UE be configured to, capable of, or operable to perform one or more operations as described herein. For example, the UE may comprise at least one memory and at least one processor coupled with the at least one memory and configured to cause the UE to receive a first configuration for an SRS, wherein the first configuration comprises one or more first frequency hopping (FH) parameters associated with transmitting the SRS on first resources not associated with a SBFD operation, and one or more second FH parameters associated with transmitting the SRS on second resources associated with the SBFD operation, determine whether an SRS transmission occurs on the first resources or the second resources, and transmit the SRS using a first FH sub-band index based on the one or more first FH parameters when the SRS transmission occurs on the first resources, or transmit the SRS using a second FH subband index based on the one or more second FH parameters when the SRS transmission occurs on the second resources.

[0025] A method performed or performable by the UE is described. The method may comprise receiving a first configuration for an SRS, wherein the first configuration comprises one or more first FH parameters associated with transmitting the SRS on first resources not associated with a SBFD operation, and one or more second FH parameters associated with transmitting the SRS on second resources associated with the SBFD operation, determining whether an SRS transmission occurs on the first resources or the second resources, and transmitting the SRS using a first FH sub-band index based on the one or more first FH parameters when the SRS transmission occurs on the first resources, or transmitting the SRS using a second FH sub-band index based on the one or more second FH parameters when the SRS transmission occurs on the second resources.

[0026] A processor for wireless communication is described. The processor may be configured to, capable of, or operable to perform one or more operations as described herein. For example, the processor may comprise at least one memory and at least one controller coupled with the at least one memory and configured to cause the processorstation to receive a first configuration for an SRS, wherein the first configuration comprises one or more first FH parameters associated with transmitting the SRS on first resources not associated with a SBFD operation, and one or more second FH parameters associated with transmitting the SRS on second resources associated with the SBFD operation, determine whether an SRS transmission occurs on the first resources or the second resources, and transmit the SRS using a first FH sub-band index based on the one or more first FH parameters when the SRS transmission occurs on the first resources, or transmit the SRS using a second FH sub-band index based on the one or more second FH parameters when the SRS transmission occurs on the second resources.

[0027] In some implementations of the UE, processor, and method described herein, the one or more first resources or the one or more second resources include slots, symbols, subframes, frames, or combinations thereof.BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 illustrates an example of a wireless communications system in accordance with aspects of the present disclosure.

[0029] Figure 2 illustrates an example block diagram that depicts a wireless cell in accordance with aspects of the present disclosure.

[0030] Figures 3 A-3B illustrate example diagrams that depict a comparison of TDD and SBFD in accordance with aspects of the present disclosure.

[0031] Figure 4 illustrates an example diagram that depicts configuring a UE with an SRS in accordance with aspects of the present disclosure.

[0032] Figure 5 A illustrates an example diagram that depicts configuring a UE with FH parameters in accordance with aspects of the present disclosure.

[0033] Figure 5B illustrates an example diagram that depicts SRS frequency hopping indices in accordance with aspects of the present disclosure.

[0034] Figure 6 illustrates an example of a user equipment (UE) in accordance with aspects of the present disclosure.

[0035] Figure 7 illustrates an example of a processor in accordance with aspects of the present disclosure.

[0036] Figure 8 illustrates an example of a network equipment (NE) in accordance with aspects of the present disclosure.

[0037] Figure 9 illustrates a flowchart of a method performed by a UE in accordance with aspects of the present disclosure.

[0038] Figure 10 illustrates a flowchart of a method performed by an NE in accordance with aspects of the present disclosure.

[0039] Figure 11 illustrates a flowchart of a method performed by a UE in accordance with aspects of the present disclosure.DETAILED DESCRIPTION

[0040] Some wireless communication systems, including one or more network entities (e.g., base stations) and UEs may support SBFD, including wireless communication according to SBFD resources as described herein. In some cases, a network entity may transmit, and a UE may receive, a reference signal, such as a channel state information reference signal (CSI-RS) on a portion of a bandwidth, such as one or more sub-bands, and while ignoring or otherwise not considering or utilizing any remaining portion of the bandwidth. However, some reference signals, such as CSI-RS, may be wideband (e.g., span an entire bandwidth) or narrow band (e.g., within a semi-static contiguous sub-band). These wireless communication systems, including the one or more network entities (e.g., base stations) and UEs, may not be configured or operable to manage (e.g., handle, schedule, allocate, assign) SBFD resources for these reference signals (e.g., wideband and / or narrowband reference signals), such as when downlink (DL) symbols include uplink (UL) sub-bands, or when UL symbols include DL sub-bands.

[0041] Various aspects of the present disclosure relate to techniques for managing (e.g., allocating, assigning, scheduling, transmitting, receiving) reference signals for SBFD. Forexample, a UE may determine a set of one or more resources (e.g., semi-static, dynamic) associated with SBFD for one or more reference signals. The set of one or more resources may include frequency resources, such as sub-band, band, physical resource block (PRB), or the like. The UE may transmit the one or more reference signals according to the determined set of one or more resources, enabling the UE to utilize reference signaling during SBFD operations and efficiently manage and / control the SFBD operations, among other benefits.

[0042] Figure 1 illustrates an example of a wireless communications system 100 in accordance with aspects of the present disclosure. The wireless communications system 100 may include one or more NE 102, one or more UE 104, and a core network (CN) 106. The wireless communications system 100 may support various radio access technologies. In some implementations, the wireless communications system 100 may be a 4G network, such as an LTE network or an LIE- Advanced (LTE-A) network. In some other implementations, the wireless communications system 100 may be a NR network, such as a 5G network, a 5G- Advanced (5G-A) network, or a 5G ultrawideband (5G-UWB) network. In other implementations, the wireless communications system 100 may be a combination of a 4G network and a 5G network, or other suitable radio access technology including Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20. The wireless communications system 100 may support radio access technologies beyond 5G, for example, 6G. Additionally, the wireless communications system 100 may support technologies, such as time division multiple access (TDMA), frequency division multiple access (FDMA), or code division multiple access (CDMA), etc.

[0043] The one or more NE 102 may be dispersed throughout a geographic region to form the wireless communications system 100. One or more of the NE 102 described herein may be or include or may be referred to as a network node, a base station, a network element, a network function, a network entity, a radio access network (RAN), a NodeB, an eNodeB (eNB), a next-generation NodeB (gNB), or other suitable terminology. An NE 102 and a UE 104 may communicate via a communication link, which may be a wireless orwired connection. For example, an NE 102 and a UE 104 may perform wireless communication (e.g., receive signaling, transmit signaling) over a Uu interface.

[0044] An NE 102 may provide a geographic coverage area for which the NE 102 may support services for one or more UEs 104 within the geographic coverage area. For example, an NE 102 and a UE 104 may support wireless communication of signals related to services (e.g., voice, video, packet data, messaging, broadcast, etc.) according to one or multiple radio access technologies. In some implementations, an NE 102 may be moveable, for example, a satellite associated with a non-terrestrial network (NTN). In some implementations, different geographic coverage areas associated with the same or different radio access technologies may overlap, but the different geographic coverage areas may be associated with different NE 102.

[0045] The one or more UE 104 may be dispersed throughout a geographic region of the wireless communications system 100. A UE 104 may include or may be referred to as a remote unit, a mobile device, a wireless device, a remote device, a subscriber device, a transmitter device, a receiver device, or some other suitable terminology. In some implementations, the UE 104 may be referred to as a unit, a station, a terminal, or a client, among other examples. Additionally, or alternatively, the UE 104 may be referred to as an Internet-of-Things (loT) device, an Internet-of-Everything (loE) device, or machine-type communication (MTC) device, among other examples.

[0046] A UE 104 may be able to support wireless communication directly with otherUEs 104 over a communication link. For example, a UE 104 may support wireless communication directly with another UE 104 over a device-to-device (D2D) communication link. In some implementations, such as vehicle-to-vehicle (V2V) deployments, vehicle-to-everything (V2X) deployments, or cellular-V2X deployments, the communication link may be referred to as a sidelink. For example, a UE 104 may support wireless communication directly with another UE 104 over a PC5 interface.

[0047] An NE 102 may support communications with the CN 106, or with another NE 102, or both. For example, an NE 102 may interface with other NE 102 or the CN 106 through one or more backhaul links (e.g., SI, N2, N2, or network interface). In some implementations, the NE 102 may communicate with each other directly. In some otherimplementations, the NE 102 may communicate with each other or indirectly (e.g., via the CN 106. In some implementations, one or more NE 102 may include subcomponents, such as an access network entity, which may be an example of an access node controller (ANC). An ANC may communicate with the one or more UEs 104 through one or more other access network transmission entities, which may be referred to as a radio heads, smart radio heads, or transmission-reception points (TRPs).

[0048] The CN 106 may support user authentication, access authorization, tracking, connectivity, and other access, routing, or mobility functions. The CN 106 may be an evolved packet core (EPC), or a 5G core (5GC), which may include a control plane entity that manages access and mobility (e.g., a mobility management entity (MME), an access and mobility management functions (AMF)) and a user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW), a Packet Data Network (PDN) gateway (P-GW), or a user plane function (UPF)). In some implementations, the control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management (e.g., data bearers, signal bearers, etc.) for the one or more UEs 104 served by the one or more NE 102 associated with the CN 106.

[0049] The CN 106 may communicate with a packet data network over one or more backhaul links (e.g., via an SI, N2, N2, or another network interface). The packet data network may include an application server. In some implementations, one or more UEs 104 may communicate with the application server. A UE 104 may establish a session (e.g., a protocol data unit (PDU) session, or the like) with the CN 106 via an NE 102. The CN 106 may route traffic (e.g., control information, data, and the like) between the UE 104 and the application server using the established session (e.g., the established PDU session). The PDU session may be an example of a logical connection between the UE 104 and the CN 106 (e.g., one or more network functions of the CN 106).

[0050] In the wireless communications system 100, the NEs 102 and the UEs 104 may use resources of the wireless communications system 100 (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers)) to perform various operations (e.g., wireless communications). In some implementations, the NEs 102 and the UEs 104 may support different resource structures.For example, the NEs 102 and the UEs 104 may support different frame structures. In some implementations, such as in 4G, the NEs 102 and the UEs 104 may support a single frame structure. In some other implementations, such as in 5G and among other suitable radio access technologies, the NEs 102 and the UEs 104 may support various frame structures (i.e., multiple frame structures). The NEs 102 and the UEs 104 may support various frame structures based on one or more numerologies.

[0051] One or more numerologies may be supported in the wireless communications system 100, and a numerology may include a subcarrier spacing and a cyclic prefix. A first numerology (e.g., / r=0) may be associated with a first subcarrier spacing (e.g., 15 kHz) and a normal cyclic prefix. In some implementations, the first numerology (e.g., / r=0) associated with the first subcarrier spacing (e.g., 15 kHz) may utilize one slot per subframe. A second numerology (e.g., / r=l) may be associated with a second subcarrier spacing (e.g., 30 kHz) and a normal cyclic prefix. A third numerology (e.g., / r=2) may be associated with a third subcarrier spacing (e.g., 60 kHz) and a normal cyclic prefix or an extended cyclic prefix. A fourth numerology (e.g., / r=3) may be associated with a fourth subcarrier spacing (e.g., 120 kHz) and a normal cyclic prefix. A fifth numerology (e.g., / r=4) may be associated with a fifth subcarrier spacing (e.g., 240 kHz) and a normal cyclic prefix.

[0052] A time interval of a resource (e.g., a communication resource) may be organized according to frames (also referred to as radio frames). Each frame may have a duration, for example, a 10 millisecond (ms) duration. In some implementations, each frame may include multiple subframes. For example, each frame may include 10 subframes, and each subframe may have a duration, for example, a 1 ms duration. In some implementations, each frame may have the same duration. In some implementations, each subframe of a frame may have the same duration.

[0053] Additionally or alternatively, a time interval of a resource (e.g., a communication resource) may be organized according to slots. For example, a subframe may include a number (e.g., quantity) of slots. The number of slots in each subframe may also depend on the one or more numerologies supported in the wireless communications system 100. For instance, the first, second, third, fourth, and fifth numerologies (i.e., / r=0, jU=l, / r=2, jU=3, / r=4) associated with respective subcarrier spacings of 15 kHz, 30 kHz, 60kHz, 120 kHz, and 240 kHz may utilize a single slot per subframe, two slots per subframe, four slots per subframe, eight slots per subframe, and 16 slots per subframe, respectively. Each slot may include a number (e.g., quantity) of symbols (e.g., OFDM symbols). In some implementations, the number (e.g., quantity) of slots for a subframe may depend on a numerology. For a normal cyclic prefix, a slot may include 14 symbols. For an extended cyclic prefix (e.g., applicable for 60 kHz subcarrier spacing), a slot may include 12 symbols. The relationship between the number of symbols per slot, the number of slots per subframe, and the number of slots per frame for a normal cyclic prefix and an extended cyclic prefix may depend on a numerology. It should be understood that reference to a first numerology (e.g., / r=0) associated with a first subcarrier spacing (e.g., 15 kHz) may be used interchangeably between subframes and slots.

[0054] In the wireless communications system 100, an electromagnetic (EM) spectrum may be split, based on frequency or wavelength, into various classes, frequency bands, frequency channels, etc. By way of example, the wireless communications system 100 may support one or multiple operating frequency bands, such as frequency range designations FR1 (410 MHz - 7.125 GHz), FR2 (24.25 GHz - 52.6 GHz), FR3 (7.125 GHz - 24.25 GHz), FR4 (52.6 GHz - 114.25 GHz), FR4a or FR4-1 (52.6 GHz - 71 GHz), and FR5 (114.25 GHz - 300 GHz). In some implementations, the NEs 102 and the UEs 104 may perform wireless communications over one or more of the operating frequency bands. In some implementations, FR1 may be used by the NEs 102 and the UEs 104, among other equipment or devices for cellular communications traffic (e.g., control information, data). In some implementations, FR2 may be used by the NEs 102 and the UEs 104, among other equipment or devices for short-range, high data rate capabilities.

[0055] FR1 may be associated with one or multiple numerologies (e.g., at least three numerologies). For example, FR1 may be associated with a first numerology (e.g., / r=0), which includes 15 kHz subcarrier spacing; a second numerology (e.g., / r=l), which includes 30 kHz subcarrier spacing; and a third numerology (e.g., / r=2), which includes 60 kHz subcarrier spacing. FR2 may be associated with one or multiple numerologies (e.g., at least 2 numerologies). For example, FR2 may be associated with a third numerology (e.g.,jU=2), which includes 60 kHz subcarrier spacing; and a fourth numerology (e.g., / r=3), which includes 120 kHz subcarrier spacing.

[0056] Figure 2 illustrates an example block diagram that depicts a wireless cell 200 in accordance with aspects of the present disclosure. The wireless cell includes the UE 104 connected to the NE 102, such as a base station or gNB. As described herein, the NE 102 may be a RAN node operating via 4G, 5G, or 6G standard, and may be implemented as a TRP, a customer premises equipment (CPE), an integrated access / backhaul (IAB) node, a relay, and so on. Generally, the UE 104 transmits to the NE 102 over an UL channel 210, and the NE 102 transmits to the UE over a DL channel 220.

[0057] As described herein, the UE 104 may be configured with an SBFD resource configuration. Via SBFD, a sub-band in a bandwidth of the wireless link or channel (e.g., UL channel 210 and / or DL channel 220) is configured to perform communication in a direction that is different from the direction of communication in the rest of the bandwidth. For example, a UL sub-band on a DL symbol refers to a sub-band within the DL bandwidth that may be used for UL communications. As another example, if a resource (e.g., a slot or symbol) is configured (e.g., via RRC) to include a sub-band, it may be called an SBFD slot / symbol. In contrast, a resource (e g., symbol or slot) that is not configured or indicated as an SBFD resource may be called a non-SBFD resource.

[0058] Figures 3 A-3B illustrate example diagrams that depict a comparison of TDD and SBFD in accordance with aspects of the present disclosure.

[0059] For TDD, as shown in Figure 3A, a bandwidth 300 includes multiple periodicities, each having DL time resources 310 (e.g., slots or symbols) and UL time resources 320 (e.g., slots or symbols.

[0060] For SBFD, as shown in Figure 3B, a bandwidth 350 includes a UL sub-band 370 that splits the bandwidth 350 into two or three sub-bands - one UL sub-band adjacent to one or two DL sub-bands 360. The remaining DL resources may also be referred to as subbands. Thus, sub-band configurations can include: a UL sub-band configured in a DL bandwidth, two DL sub-bands and a UL sub-band (all configured separately), two DL subbands configured in a UL bandwidth, and so on.

[0061] In some cases, the bandwidth 350 may also include one or more guard bands 375, which can be explicitly configured or implicitly determined. A guard band 375 may be located between adjacent sub-bands, such as between a DL sub-band and a UL sub-band. The guard band 375 may be configured as a number of physical resource blocks (PRBs) on which the UE 104 does not receive or transmit signals.

[0062] As described herein, a sub-band may be configured or indicated as one or more PRBs or resource block groups (RBGs). A sub-band may be configured by the RRC and / or indicated by L1 / L2 signaling. For example, a sub-band may be configured by two parameters, such as {Start-RB, Number-of-RBs} , {Start-RB, End-RB}, and so on.

[0063] PRBs in a communication bandwidth (e.g., frequency band, carrier, CC, bandwidth partition (BWP)) may be divided into groups of N consecutive RBs, wherein N is an integer specified by the standard or indicated by the network. Example values for N are 1, 2, 4, and so on. If the bandwidth is ARBPRBs, the bandwidth may be divided into M groups of N consecutive PRBs, wherein M = [ARB / A],

[0064] If a group of N consecutive RBs is referred to as an RBG, a sub-band may be indicated by {Start-RBG, Number-of-RBGs} , {Start-RBG, End-RBG}, or more generally by a bitmap of length M in which each bit may indicate whether an associated RBG is included (e.g., if bit=’ 1 ’) or not included (e.g., if bit=’O’). In some cases, when the number PRBs ARBis not an integer multiple of N, then the first RBG and / or the last RBG may comprise a smaller number of PRBs than N. Whether this is applicable to the first RBG or the last RBG may be specified by the standard or indicated by the network

[0065] Typically, wireless communications systems perform half-duplex operations, such as by employing transceivers that perform either Tx or RX using one antenna. However, when operating SBFD (or other advanced duplexing), the UE 104 or the NE 102 may communicate in DL and UL simultaneously. For example, dynamic / flexible TDD (d / f- TDD) and sub-band full-duplex (SBFD) allow cells in a vicinity to use the same resources in time and / or frequency domains for both DL and UL transmissions. However, this simultaneous operation may lead to CLI between base stations and / or between UEs.

[0066] In some embodiments, the NE 102, such as a base station (e.g., gNB), RAN node, and so on, configures a UE with an SRS and various parameters associated with the SRS. Figure 4 illustrates an example diagram 400 that depicts configuring a UE with an SRS in accordance with aspects of the present disclosure.

[0067] The NE 102 transmits an SRS configuration 410 to the UE 104. The SRS configuration 410 includes one or more parameters that indicate a list of sub-bands to include (or exclude) when the UE 104 transmits an SRS 430. As described herein, a subband can include a subset of a frequency band used for communications and may be configured or indicated by one or more PBs in an air interface (e.g., based on Orthogonal Frequency Division Multiplexing (OFDM) and / or Orthogonal Frequency Division Multiplexing Access (OFDMA)).

[0068] The list of sub-bands may include entries, where each entry is associated with an index (or ID). Other communications performed by the UE 104, such as other configurations, L1 / L2 signaling, and so on, may utilize the indices. When the UE 104 operates with dynamic SBFD, the UE 104 may utilize L1 / L2 signaling to indicate sub-band indices to include and / or exclude for the UE 104 to transmit the SRS 430. In response, the UE 104 determines the SRS frequency resources by including and / or excluding the indicated sub-bands and then transmits the SRS on the determined frequency resources.

[0069] The SRS configuration 410 may include multiple SRS resources in time and / or frequency domains. The UE 104 may determine the bandwidth of an SRS resource, such as the PRBs / REs on which the SRS 430 is to be transmitted, as follows.

[0070] When the bandwidth of the SRS resource is confined within a UL sub-band, the UE 104 determines the bandwidth of the SRS resource as indicated by the SRS configuration 410. Else, when the bandwidth of the SRS resource is not confined within a UL sub-band, the UE 104 may determine the bandwidth of the SRS via the various techniques described herein.

[0071] In some embodiments, the UE 104 determines the bandwidth of an SRS resource as the union (overlap) of the bandwidth indicated by the SRS configuration 410and the UL sub-band. The UE 104 determines an SRS sequence based on the determined bandwidth and transmits the SRS 430.

[0072] In some embodiments, the UE 104 determines the bandwidth of the SRS resource as the union (overlap) of the bandwidth indicated by the SRS resource configuration and the UL sub-band. The UE 104 obtains a new SRS sequence by zeroing the SRS sequence elements that are associated with the PRBs / REs that are not confined within the UL sub-band.

[0073] However, while this technique may not be a complex computation when there is a dynamic change of the UL sub-band may dynamically change, issues may arise when the SRS resource has a constant amplitude (e.g., when a Zadoff-Chu sequence is used), because zeroing elements of the sequence may eliminate such an optimal property.

[0074] In some embodiments, the UE 104 determines an error case upon determining that the bandwidth of the SRS resource is not confined within the UL sub-band. The UE 104 may decline to transmit the SRS 430, and / or signal information to the NE 102 to inform the NE 102 of the error case.

[0075] In response to a determination of an error case, as described herein, the UE 104 may perform the following actions:

[0076] neglect an SRS transmission;

[0077] neglect an SRS transmission and send a signaling comprising an indication of the error case (e.g., a message indicating that the UE does not transmit the SRS and / or a reason for not transmitting the SRS);

[0078] neglect a UL sub-band indication for SRS transmission;

[0079] neglect a UL sub-band indication for SRS transmission and send a signaling comprising an indication of the error case;

[0080] transmit the SRS on a best-effort basis (e.g., include as many frequency resources as possible for the SRS transmission);

[0081] transmit the SRS on a best-effort basis and send a signaling comprising an indication of the error case (e.g., a message indicating that the UE transmits the SRS on a best effort basis, an indication of the resources on which the UE transmits the SRS, and / or a reason for the SRS transmission based on a best-effort basis); and so on.

[0082] In some embodiments, the UE 102 determines whether one or more conditions are satisfied with respect to a SRS resource configuration bandwidth, the UL bandwidth, the union of the two bandwidths, or a combination thereof. For example, the UE 104 may receive a configuration that identifies a UL sub-band 420 and determine whether the conditions are satisfied or met based on the SRS configuration 410 and / or the configuration of the UL sub-band 420.

[0083] When the one or more conditions are satisfied or met, the UE 104 determines the SRS resource bandwidth based on the SRS resource configuration bandwidth and the UL bandwidth. Else, when one or more of the conditions are not met, the UE 104 may determine an error case and / or determine the SRS bandwidth via another methods that satisfies the condition.

[0084] In a first example, the one or more conditions include a minimum bandwidth for the SRS resource. When the union of the SRS resource configuration bandwidth and the UL sub-band bandwidth is smaller than the minimum bandwidth, the condition is not met, and the UE 104 may determine an error case.

[0085] In a second example, the one or more conditions include a length of an SRS sequence. An SRS sequence, in some cases, is to be divisible by a limited set of prime numbers (and not by other prime numbers). For example, if the set of prime numbers is {2, 3, 5}, than the number of REs may not be divisible by another prime number, such as 7 or 11. If the UE 104 determines that the number of REs N in the union of the SRS resource configuration bandwidth and the UL sub-band bandwidth is divisible by a prime number that is not in the limited set, the UE 104 may:

[0086] determine an error case, or

[0087] determine the number of REs for SRS transmission as the largest integer that is smaller than N and is not divisible to other prime numbers and determine the SRS sequence for the determined number of REs.

[0088] In a third example, the one or more conditions include a length of the SRS sequence, where the SRS sequence is to be an integer multiple of a certain number M when the UE 104 obtains the length of the SRS sequence by taking a union (overlap) of the SRS resource bandwidth configuration and the bandwidth of the UL sub-band. For example, M may be equal to 6, according to a specification or a configuration. If the UE 104 determines that the number of REs N in the union of the SRS resource configuration bandwidth and the UL sub-band bandwidth is not a multiple of M, the UE 104 may:

[0089] determine an error case, or

[0090] determine the number of REs for SRS transmission as the largest integer that is smaller than N and is an integer multiple of M and determine the SRS sequence for the determined number of REs.

[0091] In a fourth example, the one or more conditions include a length of the SRS sequence is not smaller than a minimum M when the UE 104 obtains the length of the SRS sequence by taking a union (overlap) of the SRS resource bandwidth configuration and the bandwidth of a UL sub-band. If the UE 104 determines that the number of REs N in the union of the SRS resource configuration bandwidth and the UL sub-band bandwidth is smaller than M, the UE 104 may determine an error case.

[0092] In a fifth example, the one or more conditions include a number N of PRBs on which the UE 104 is to transmit the SRS 430. For example, the condition may dictate that N should not be divisible to prime numbers other than a certain set of prime numbers (e.g., {2, 3, 5}), the number N of PRBs should be an integer multiple of a certain number M (e.g., M=6), the N of the PRBs should not be smaller than a minimum M, and so on. If the UE 104 determines that the number N of PRBs in the union of the SRS resource configuration bandwidth and the UL sub-band bandwidth does not satisfy the condition, the UE 104 may:

[0093] determine an error case, or

[0094] determine the number of PRBs for SRS transmission as a number that satisfies the condition (e.g., the largest integer that is smaller than N and satisfies the condition or the smallest number that satisfies the condition).

[0095] In a sixth example, the one or more conditions may be associated with an SRS sequence length, a number of REs on which to transmit the SRS 430, a number of PRBs on which to transmit the SRS 430, a number of REs in contiguous PRBs on which to transmit the SRS 430, a number of contiguous PRBs on which to transmit the SRS 430, and so on. If the UE 104 determines that any of the conditions do not apply to the SRS sequence length, the number of REs, and / or the number of PRBs in the union of the SRS resource configuration bandwidth and the UL sub-band bandwidth, the UE 104 may:

[0096] determine an error case, or

[0097] determine the SRS sequence length, the number of REs, and / or the number of PRBs, such that any or all of them satisfy the one or more conditions.

[0098] In some embodiments, the UE 104 receives the SRS configuration 410, which includes SRS resources in the time and frequency domains, and L1 / L2 signaling that indicates or includes the UL sub-band (e.g., the configuration of UL sub-band 420). The UE 104 may determine the bandwidth of an SRS resource (e.g., the PRBs / REs on which the UE 104 is to transmit the SRS 430, as follows.

[0099] When the bandwidth of the SRS resource is confined within a UL sub-band, then the UE 104 determines the bandwidth of the SRS resource as indicated by the SRS resource configuration, and when the bandwidth of the SRS resource is not confined within the UL sub-band, then the UE 104 determines that the bandwidth of the SRS resource by other techniques described herein.

[0100] The L1 / L2 signaling that indicates or includes the UL sub-band (e.g., the configuration of UL sub-band 420), may include:

[0101] a signaling indicating a UL sub-band for any or all UL communications, including transmission of the SRS 430, where the L1 / L2 signaling is part of a dynamic SBFD realization (e.g., the L1 / L2 signaling indicates a UL sub-band dynamically for any orall UL communications by the UE 104). The communications may include the SRS transmission if the associated SRS resource overlaps with the indicated UL sub-band in the time domain (symbols, slots) and / or the frequency domain (frequency band, carrier, CC, BWP, PRBs), and / or

[0102] a signaling indicating a UL sub-band for the SRS 430 transmission, where the L1 / L2 signaling may indicate a sub-band on which to transmit the SRS 430. The sub-band may or may not be identical to a UL sub-band on which other UL communications, such as physical uplink control channel (PUCCH), physical uplink shared channel (PUSCH), or random access procedure (RACH) occur or are present. The network (e.g., the NE 102) may use the signaling to indicate to the UE 104 to confine the SRS transmission to a certain bandwidth, such that a serving base station (e.g., the gNB) obtains an estimate of the UL channel while avoiding an interference by the SRS 430 in other bandwidths.

[0103] In all cases, the L1 / L2 signaling may indicate a UL sub-band to the UE 104 on which to transmit the SRS 430. In response, the UE 104 may determine an SRS resource bandwidth (e.g., multiple PRBs / REs) on which to transmit the SRS 430. In some cases, the UE 104 may determine the SRS resource bandwidth as a union (overlap) of a bandwidth of the SRS resource configuration, a bandwidth of a UL sub-band configuration, a bandwidth of a UL sub-band indicated by the L1 / L2 signaling, and so on.

[0104] The UE may determine the SRS 430 by: computing a first SRS sequence according to the SRS configuration and computing a second SRS sequence for transmission by zeroing the sequence elements associated with resources (e.g., PRBs, REs) outside the determined SRS resource bandwidth (B); or computing the SRS sequence for transmission directly based on the determined SRS resource bandwidth.

[0105] In some cases, the UE 104 may compute the SRS sequence with a different length at different SRS transmission occasions, such as when zeroing a number of elements in an SRS sequence may violate certain desirable properties of the signal (e.g., the constant amplitude of a Zadoff-Chu sequence), as described herein.

[0106] In some embodiments, the one or more conditions may be associated with an SRS sequence length, a number of REs on which to transmit the SRS 430, a number ofPRBs on which to transmit the SRS 430, a number of REs in contiguous PRBs on which to transmit the SRS 430, a number of contiguous PRBs on which to transmit the SRS 430, and so on. When the one or more conditions are met, the UE 104 determines the SRS resource bandwidth based on the SRS resource configuration bandwidth and the UL bandwidth. Otherwise, the UE 104 may:

[0107] determine an error case,

[0108] determine the SRS bandwidth by performing a method that satisfies the conditions, or

[0109] declines to apply the UL sub-band indicated by the L1 / L2 signaling, as follows.

[0110] In some embodiments, the UE 104 receives a first L1 / L2 signaling and determines an SRS resource bandwidth based in part on a UL sub-band indication in the L1 / L2 signaling. The UE 104 may determine that one or multiple conditions associated with the SRS sequence length, the number of REs, the number of PRBs, and so on, according to the determined SRS resource bandwidth, are not satisfied or met. In response, the UE 104 may send a second L1 / L2 signaling, indicating to the network (the NE 102) that the UE 102 has not applied the UL sub-band indicated by the first L1 / L2 signaling.

[0111] In a first example, the UE 104 may indicate that the UE 104 does not apply the indicated UL sub-band for one SRS transmission occasion.

[0112] In a second example, the UE 104 may indicate that the UE 104 does not apply the indicated UL sub-band for N SRS transmission occasions, where the N is indicated by the second L1 / L2 signaling, specified by the standard, configured by the network, or determined according to an implementation or system state.

[0113] In a third example, the UE 104 may indicate that the UE 104 does not apply the indicated UL sub-band for SRS transmission occasions during a certain duration (e.g., N milliseconds, N slots, N subframes, N frames, or N seconds).

[0114] In a fourth example, the UE 104 may indicate that the UE 104 does not apply the indicated UL sub-band for SRS transmission occasions until the one or more conditions are satisfied. The UE 104 may further indicate, through the same L1 / L2 signaling or otherL1 / L2 signaling, the one or more conditions yet to be met. In such cases, the UE 104 may apply the UL sub-band for SRS transmissions when any or all of the conditions are met.

[0115] In a fifth example, the UE 104 may indicate that the UE 104 does not apply the indicated UL sub-band for SRS transmissions, effectively declining the UL sub-band indication. The UE 104 may further indicate, through the second L1 / L2 signaling or a new, third, L1 / L2 signaling, any reasons for declining the UL sub-band indication for SRS transmissions. In such cases, the UE 104 may not apply the UL sub-band for SRS transmissions when any or all conditions are met, and instead, the NE 102 transmits a fourth L1 / L2 signaling to modify the configuration of the UE 104 to meet one or all of the conditions.

[0116] In some embodiments, the network may configure the UE 104 with SRS resources with frequency hopping parameters. FH for an SRS allows the UE 104 to transmit the SRS on a fraction of the UL bandwidth at a time, aiming to improve the signal- to-noise ratio (SNR) at a base station as the UE 104 may often use the transmission power on a fraction of the bandwidth at a time instead of spreading the transmission power across the whole bandwidth.

[0117] Under FH, the UL bandwidth is split into sub-bands, and the UE 104 transmits the SRS on a first sub-band at a first SRS transmission occasion, on a second sub-band at a second SRS transmission occasion, and so on. However, issues arise when FH sub-bands are not confined within the UL sub-band on an SBFD symbol (e.g., a part of the FH subband may overlap with a DL sub-band and / or a guard- band). In such cases, the UE 104 may not transmit the SRS on the part of the bandwidth not confined within the UL sub-band.

[0118] In one approach, the network may configure the UE 104 with separate SRS resource configurations for non-SBFD slots / symbols and SBFD slots / symbols. Each SRS resource may then include FH parameters that avoid overlapping an FH sub-band with a DL sub-band or guard-band. However, this approach has drawbacks associated with resource budgets and flexibility. For example, each SRS resource configuration consumes the SRS resource configuration budget of the UE 104 (e.g., the maximum number of SRS resource configurations according to the capability of the UE 104). Also, with dynamicSBFD, the network modifies an SRS resource configuration for SBFD symbols each time that the SBFD UL sub-band changes, which may be inflexible and / or inefficient.

[0119] To avoid such issues, the network may configure the UE 104 with SRS resources having frequency hopping parameters. Figure 5A illustrates an example diagram 500 that depicts configuring a UE with FH parameters in accordance with aspects of the present disclosure.

[0120] The UE 104 receives an SRS configuration 510 with two separate sets of FH parameters: a first set of FH parameters for transmission of an SRS 520 on non-SBFD symbols, and a second set of FH parameters for the SRS 5320 transmission on SBFD symbols. The UE 104 determines whether an SRS transmission occasion occurs on a non- SBFD slot / symbol or an SBFD slot / symbol. If the SRS transmission occasion occurs on a non-SBFD slot / symbol, the UE 104 uses the first set of FH parameters for the SRS transmission. When the SRS transmission occasion occurs on an SBFD slot / symbol, the UE 104 use the second set of FH parameters for the SRS transmission.

[0121] According to the current specification, the UE 104 uses FH parameters to split the UL bandwidth into a number N of FH sub-bands and then transmits the SRS on a first FH sub-band in a first SRS transmission occasion, on a second FH sub-band in a second SRS transmission occasion, and so on. To do so, the UE 104 maintains an index I for determining the FH sub-band on which to transmit the SRS. For example, if 1=1, then the UE 104 transmits the SRS on the first FH sub-band; if 1=2, then the UE transmits the SRS on the second FH sub-band, and so on. The UE 104 may start with 1=1 and increment the value of I every time that the UE 104 transmits the SRS on the I-th FH sub-band. Once the index I reaches a value of N (e.g., the number of FH sub-bands), then the UE 104 may reset the index I back to 1 and start over.

[0122] In order to implement two sets of FH parameters, the UL bandwidth may be split differently on non-SBFD slots / symbols and SBFD slots / symbols, because the UL subband may be different across non-SBFD slots / symbols, the number N of FH sub-bands may be different across non-SBFD and SBFD symbols, or both. Such a case may result in nonidentical FH sub-bands. If the UE 104 maintains an index I for determining the FH subband on which to transmit the SRS 520, the UE 104 may mistakenly transmit the SRS 520on a certain part of the UL bandwidth when the SRS transmission occasions occur on non- SBFD slots / symbols and SBFD slots / symbols intermittently.

[0123] Thus, in some cases, the UE 104 maintain two indices I and J for non-SBFD slots / symbols and non-SBFD slots / symbols, respectively. The UE 104 may reset the indices to 1=1 and J=1. When the UE 104 transmits the SRS 520, the UE 104 determines or tracks whether the SRS 520 is transmitted on a non-SBFD slot / symbol or an SBFD slot / symbol, and updates the associated index. For example:

[0124] When the SRS 520 is to be transmitted on a non-SBFD slot / symbol, the UE 104 may transmit the SRS on the I-th FH sub-band and increment I, unless I equals the number N of FH sub-band on non-SBFD symbols / slots, in which case the UE 104 resets the index I to 1; or

[0125] When the SRS 520 is to be transmitted on a non-SBFD slot / symbol, the UE 104 may transmit the SRS on the J-th FH sub-band and increment J, unless J equals the number M of FH sub-band on non-SBFD symbols / slots, in which case the UE 104 resets the index J to 1. Thus, the UE 104 can maintain two separate indices for each FH sub-band and increment the indices separately.

[0126] In some cases, such as when SRS resources are multiplexed among at least one enhanced (e.g., SBFD-aware) UE and at least one legacy UE, the legacy UE may follow the legacy SRS FH pattern (e.g., by using one index), while the enhanced UE may use two indices to perform SRS FH, which may result in a resource collision among the UEs. The network may handle configure the UEs with proper configurations to avoid any resource collisions (e.g., if the SRS FH results in different FH patterns for legacy and enhanced UEs, then the network may not configure the UEs with SRS resources that are multiplexed).

[0127] In some embodiments, the UE 104 may be configured with two separate sets of FH parameters. Figure 5B illustrates an example diagram 550 that depicts SRS frequency hopping indices in accordance with aspects of the present disclosure. The diagram 550 depicts a first scenario 580, where a single index is incremented for every UE transmission, and a second (e.g., modified) scenario 590, where both indices may be incremented for a transmission (e.g., an SBFD transmission).

[0128] The UE 104 may maintain two indices, I and J. The UE 104 performs SRS FH on non-SBFD and SBFD resources. If an SRS transmission is on non-SBFD resources (e.g., UL 570), then the UE 104 transmits the SRS according to the first set of FH parameters and increments the first index I. Otherwise, if the SRS transmission is on an SBFD resource (e.g., UL sub-band 575 of DL 560), then the UE 104 transmits the SRS according to the second set of FH parameters and increments both the second index J and the first index I (see scenario 590). Thus, incrementing the index I can avoid SRS resource collisions with legacy UEs.

[0129] In some cases, the modified behavior of the UE 104 may be specified by the standard or configured by the network. For example, the UE 104 may additionally increment the first index I upon receiving an indication from the network that the SRS transmission or SRS FH is compatible with legacy SRS transmission or SRS FH. The SRS configuration or an L1 / L2 indication may include the indication.

[0130] In some embodiments, the UE 104 may be configured with an SRS with an additional indication to perform SRS FH in a manner that does not cause a resource collision with a legacy SRS transmission. The additional indication may indicate at least one of the following to the UE:

[0131] the SRS transmission should be compatible with a legacy SRS transmission;

[0132] the SRS FH should be compatible with a legacy SRS FH;

[0133] SRS resources are multiplexed with at least one legacy UE;

[0134] use one index for performing the SRS FH; and so on.

[0135] In response, the UE 104 may follow an SRS transmission that is compatible with a legacy SRS transmission.

[0136] In a first example, the UE 104 may transmit the SRS as follows. For each SRS transmission, determine an FH sub-band to transmit the SRS, and when the FH sub-band is confined within the UL sub-band, then transmit the SRS in the FH sub-band. When the FH sub-band partially overlaps with the UL sub-band, then transmit the SRS in the intersection of the SRS FH sub-band and the UL sub-band. When the FH sub-band does not overlapwith the UL sub-band, do not transmit the SRS (e.g., neglect this instance of the SRS transmission).

[0137] In a second example, the UE 104 may transmit the SRS as follows. For SRS transmission, determine an FH sub-band to transmit the SRS, and when the FH sub-band is confined within the UL sub-band, then transmit the SRS in the FH sub-band, else, do not transmit the SRS (e.g., neglect this instance of the SRS transmission).

[0138] In a third example, the UE 104 may neglect the UL sub-band and transmit the SRS even if the SRS resources or the SRS FH sub-band is not fully or partially confined within the UL sub-band. This example may be applicable when the SRS transmission has a higher priority than the UL sub-band and may be indicated to the UE 104 (e.g., the UE may neglect the UL sub-band for transmitting the SRS upon receiving an indication from the network to do so).

[0139] In some cases, if an SRS FH sub-band is not confined within the UL sub-band, the UE 104 may determine an “error case” for transmitting the SRS. For example, if an SRS FH sub-band is not confined within the UL sub-band on an SBFD resource, the UE 104 may determine an error case for transmitting the SRS on that resource.

[0140] In some embodiments, such as for dynamic SBFD, where a UE may be configured with multiple sub-bands, the UE 104 may be configured with multiple sets of FH parameters. In some examples, the UE may maintain multiple FH indices (e.g., 10, 11, 12, and so on) for performing SRS FH on non-SBFD symbols (e.g., a first UL sub-band, a second UL sub-band, and so on).

[0141] In a first example, the UE 104 may increment 10 when transmitting SRS on non- SBFD resources, increment 11 when transmitting SRS on the first UL subOband, increment 12 when transmitting SRS on the second UL sub-band, and so on. In a second example, in order to avoid SRS resource collisions, the UE 104 may increment 10 for transmitting SRS on non-SBFD resources, increment both 11 and 10 for transmitting SRS on a first UL subband, increment both 12 and 10 for transmitting SRS on a second UL sub-band, and so on. Thus, the UE 104 may maintain (and increment) as many indices as transmissions on different sub-bands.

[0142] Figure 6 illustrates an example of a UE 600 in accordance with aspects of the present disclosure. The UE 600 may include a processor 602, a memory 604, a controller 606, and a transceiver 608. The processor 602, the memory 604, the controller 606, or the transceiver 608, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present disclosure as described herein. These components may be coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces.

[0143] The processor 602, the memory 604, the controller 606, or the transceiver 608, or various combinations or components thereof may be implemented in hardware (e.g., circuitry). The hardware may include a processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), or other programmable logic device, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present disclosure.

[0144] The processor 602 may include an intelligent hardware device (e.g., a general- purpose processor, a DSP, a CPU, an ASIC, an FPGA, or any combination thereof). In some implementations, the processor 602 may be configured to operate the memory 604. In some other implementations, the memory 604 may be integrated into the processor 602. The processor 602 may be configured to execute computer-readable instructions stored in the memory 604 to cause the UE 600 to perform various functions of the present disclosure.

[0145] The memory 604 may include volatile or non-volatile memory. The memory 604 may store computer-readable, computer-executable code including instructions when executed by the processor 602 cause the UE 600 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such the memory 604 or another type of memory. Computer-readable media includes both non- transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer.

[0146] In some implementations, the processor 602 and the memory 604 coupled with the processor 602 may be configured to cause the UE 600 to perform one or more of thefunctions described herein (e.g., executing, by the processor 602, instructions stored in the memory 604).

[0147] The processor 602 may support wireless communication at the UE 600 in accordance with examples as disclosed herein. For example, the UE 600 may be configured to support a means for receiving a first configuration comprising a first indication of a first set of frequency resources for an SRS, receiving a second configuration comprising a second indication of an UL sub-band, determining a second set of frequency resources for the SRS based on the first configuration and the second configuration, and transmitting the SRS on the second set of frequency resources in response to a condition associated with the second set of frequency resources being satisfied.

[0148] As another example, the UE 600 may be configured to support a means for receiving a first configuration for an SRS, wherein the first configuration comprises: one or more first FH parameters associated with transmitting the SRS on first resources not associated with an SBFD operation, and one or more second FH parameters associated with transmitting the SRS on second resources associated with the SBFD operation, determining whether an SRS transmission occurs on the first resources or the second resources, and transmitting the SRS using a first FH sub-band index based on the one or more first FH parameters when the SRS transmission occurs on the first resources, or transmitting the SRS using a second FH sub-band index based on the one or more second FH parameters when the SRS transmission occurs on the second resources.

[0149] The controller 606 may manage input and output signals for the UE 600. The controller 606 may also manage peripherals not integrated into the UE 600. In some implementations, the controller 606 may utilize an operating system such as iOS®, ANDROID®, WINDOWS®, or other operating systems. In some implementations, the controller 606 may be implemented as part of the processor 602.

[0150] In some implementations, the UE 600 may include at least one transceiver 608. In some other implementations, the UE 600 may have more than one transceiver 608. The transceiver 608 may represent a wireless transceiver. The transceiver 608 may include one or more receiver chains 610, one or more transmitter chains 612, or a combination thereof.

[0151] A receiver chain 610 may be configured to receive signals (e.g., control information, data, packets) over a wireless medium. For example, the receiver chain 610 may include one or more antennas for receive the signal over the air or wireless medium. The receiver chain 610 may include at least one amplifier (e.g., a low-noise amplifier (LNA)) configured to amplify the received signal. The receiver chain 610 may include at least one demodulator configured to demodulate the receive signal and obtain the transmitted data by reversing the modulation technique applied during transmission of the signal. The receiver chain 610 may include at least one decoder for decoding the processing the demodulated signal to receive the transmitted data.

[0152] A transmitter chain 612 may be configured to generate and transmit signals (e.g., control information, data, packets). The transmitter chain 612 may include at least one modulator for modulating data onto a carrier signal, preparing the signal for transmission over a wireless medium. The at least one modulator may be configured to support one or more techniques such as amplitude modulation (AM), frequency modulation (FM), or digital modulation schemes like phase-shift keying (PSK) or quadrature amplitude modulation (QAM). The transmitter chain 612 may also include at least one power amplifier configured to amplify the modulated signal to an appropriate power level suitable for transmission over the wireless medium. The transmitter chain 612 may also include one or more antennas for transmitting the amplified signal into the air or wireless medium.

[0153] Figure 7 illustrates an example of a processor 700 in accordance with aspects of the present disclosure. The processor 700 may be an example of a processor configured to perform various operations in accordance with examples as described herein. The processor 700 may include a controller 702 configured to perform various operations in accordance with examples as described herein. The processor 700 may optionally include at least one memory 704, which may be, for example, an L1 / L2 / L3 cache. Additionally, or alternatively, the processor 700 may optionally include one or more arithmetic-logic units (ALUs) 706. One or more of these components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., buses).

[0154] The processor 700 may be a processor chipset and include a protocol stack (e.g., a software stack) executed by the processor chipset to perform various operations (e.g., receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) in accordance with examples as described herein. The processor chipset may include one or more cores, one or more caches (e.g., memory local to or included in the processor chipset (e.g., the processor 700) or other memory (e.g., random access memory (RAM), read-only memory (ROM), dynamic RAM (DRAM), synchronous dynamic RAM (SDRAM), static RAM (SRAM), ferroelectric RAM (FeRAM), magnetic RAM (MRAM), resistive RAM (RRAM), flash memory, phase change memory (PCM), and others).

[0155] The controller 702 may be configured to manage and coordinate various operations (e.g., signaling, receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) of the processor 700 to cause the processor 700 to support various operations in accordance with examples as described herein. For example, the controller 702 may operate as a control unit of the processor 700, generating control signals that manage the operation of various components of the processor 700. These control signals include enabling or disabling functional units, selecting data paths, initiating memory access, and coordinating timing of operations.

[0156] The controller 702 may be configured to fetch (e.g., obtain, retrieve, receive) instructions from the memory 704 and determine subsequent instruction(s) to be executed to cause the processor 700 to support various operations in accordance with examples as described herein. The controller 702 may be configured to track memory address of instructions associated with the memory 704. The controller 702 may be configured to decode instructions to determine the operation to be performed and the operands involved. For example, the controller 702 may be configured to interpret the instruction and determine control signals to be output to other components of the processor 700 to cause the processor 700 to support various operations in accordance with examples as described herein. Additionally, or alternatively, the controller 702 may be configured to manage flow of data within the processor 700. The controller 702 may be configured to control transferof data between registers, arithmetic logic units (ALUs), and other functional units of the processor 700.

[0157] The memory 704 may include one or more caches (e.g., memory local to or included in the processor 700 or other memory, such RAM, ROM, DRAM, SDRAM, SRAM, MRAM, flash memory, etc. In some implementations, the memory 704 may reside within or on a processor chipset (e.g., local to the processor 700). In some other implementations, the memory 704 may reside external to the processor chipset (e.g., remote to the processor 700).

[0158] The memory 704 may store computer-readable, computer-executable code including instructions that, when executed by the processor 700, cause the processor 700 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. The controller 702 and / or the processor 700 may be configured to execute computer-readable instructions stored in the memory 704 to cause the processor 700 to perform various functions. For example, the processor 700 and / or the controller 702 may be coupled with or to the memory 704, the processor 700, the controller 702, and the memory 704 may be configured to perform various functions described herein. In some examples, the processor 700 may include multiple processors and the memory 704 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions herein.

[0159] The one or more ALUs 706 may be configured to support various operations in accordance with examples as described herein. In some implementations, the one or more ALUs 706 may reside within or on a processor chipset (e.g., the processor 700). In some other implementations, the one or more ALUs 706 may reside external to the processor chipset (e.g., the processor 700). One or more ALUs 706 may perform one or more computations such as addition, subtraction, multiplication, and division on data. For example, one or more ALUs 706 may receive input operands and an operation code, which determines an operation to be executed. One or more ALUs 706 be configured with a variety of logical and arithmetic circuits, including adders, subtractors, shifters, and logicgates, to process and manipulate the data according to the operation. Additionally, or alternatively, the one or more ALUs 706 may support logical operations such as AND, OR, exclusive-OR (XOR), not-OR (NOR), and not- AND (NAND), enabling the one or more ALUs 706 to handle conditional operations, comparisons, and bitwise operations.

[0160] The processor 700 may support wireless communication in accordance with examples as disclosed herein. For example, the processor 700 may be configured to support a means for receiving a first configuration comprising a first indication of a first set of frequency resources for an SRS, receiving a second configuration comprising a second indication of an UL sub-band, determining a second set of frequency resources for the SRS based on the first configuration and the second configuration, and transmitting the SRS on the second set of frequency resources in response to a condition associated with the second set of frequency resources being satisfied.

[0161] As another example, the processor 700 may be configured to support a means for receiving a first configuration for an SRS, wherein the first configuration comprises: one or more first FH parameters associated with transmitting the SRS on first resources not associated with an SBFD operation, and one or more second FH parameters associated with transmitting the SRS on second resources associated with the SBFD operation, determining whether an SRS transmission occurs on the first resources or the second resources, and transmitting the SRS using a first FH sub-band index based on the one or more first FH parameters when the SRS transmission occurs on the first resources, or transmitting the SRS using a second FH sub-band index based on the one or more second FH parameters when the SRS transmission occurs on the second resources.

[0162] Figure 8 illustrates an example of a NE 800 in accordance with aspects of the present disclosure. The NE 800 may include a processor 802, a memory 804, a controller 806, and a transceiver 808. The processor 802, the memory 804, the controller 806, or the transceiver 808, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present disclosure as described herein. These components may be coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces.

[0163] The processor 802, the memory 804, the controller 806, or the transceiver 808, or various combinations or components thereof may be implemented in hardware (e.g., circuitry). The hardware may include a processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), or other programmable logic device, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present disclosure.

[0164] The processor 802 may include an intelligent hardware device (e.g., a general- purpose processor, a DSP, a CPU, an ASIC, an FPGA, or any combination thereof). In some implementations, the processor 802 may be configured to operate the memory 804. In some other implementations, the memory 804 may be integrated into the processor 802. The processor 802 may be configured to execute computer-readable instructions stored in the memory 804 to cause the NE 800 to perform various functions of the present disclosure.

[0165] The memory 804 may include volatile or non-volatile memory. The memory 804 may store computer-readable, computer-executable code including instructions when executed by the processor 802 cause the NE 800 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such the memory 804 or another type of memory. Computer-readable media includes both non- transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer.

[0166] In some implementations, the processor 802 and the memory 804 coupled with the processor 802 may be configured to cause the NE 800 to perform one or more of the functions described herein (e.g., executing, by the processor 802, instructions stored in the memory 804).

[0167] For example, the processor 802 may support wireless communication at the NE 800 in accordance with examples as disclosed herein. The UE 600 may be configured to support a means for transmitting a first configuration comprising a first indication of a first set of frequency resources for an SRS, transmitting a second configuration comprising a second indication of a UL sub-band, wherein a second set of frequency resources for theSRS is based on the first configuration and the second configuration, and receiving the SRS on the second set of frequency resources in response to a condition associated with the second set of frequency resources being satisfied.

[0168] The controller 806 may manage input and output signals for the NE 800. The controller 806 may also manage peripherals not integrated into the NE 800. In some implementations, the controller 806 may utilize an operating system such as iOS®, ANDROID®, WINDOWS®, or other operating systems. In some implementations, the controller 806 may be implemented as part of the processor 802.

[0169] In some implementations, the NE 800 may include at least one transceiver 808. In some other implementations, the NE 800 may have more than one transceiver 808. The transceiver 808 may represent a wireless transceiver. The transceiver 808 may include one or more receiver chains 810, one or more transmitter chains 812, or a combination thereof.

[0170] A receiver chain 810 may be configured to receive signals (e.g., control information, data, packets) over a wireless medium. For example, the receiver chain 810 may include one or more antennas for receive the signal over the air or wireless medium. The receiver chain 810 may include at least one amplifier (e.g., a low-noise amplifier (LNA)) configured to amplify the received signal. The receiver chain 810 may include at least one demodulator configured to demodulate the receive signal and obtain the transmitted data by reversing the modulation technique applied during transmission of the signal. The receiver chain 810 may include at least one decoder for decoding the processing the demodulated signal to receive the transmitted data.

[0171] A transmitter chain 812 may be configured to generate and transmit signals (e.g., control information, data, packets). The transmitter chain 812 may include at least one modulator for modulating data onto a carrier signal, preparing the signal for transmission over a wireless medium. The at least one modulator may be configured to support one or more techniques such as amplitude modulation (AM), frequency modulation (FM), or digital modulation schemes like phase-shift keying (PSK) or quadrature amplitude modulation (QAM). The transmitter chain 812 may also include at least one power amplifier configured to amplify the modulated signal to an appropriate power level suitablefor transmission over the wireless medium. The transmitter chain 812 may also include one or more antennas for transmitting the amplified signal into the air or wireless medium.

[0172] Figure 9 illustrates a flowchart of a method in accordance with aspects of the present disclosure. The operations of the method may be implemented by a UE as described herein. In some implementations, the UE may execute a set of instructions to control the function elements of the UE to perform the described functions.

[0173] At 902, the method may include receiving a first configuration comprising a first indication of a first set of frequency resources for an SRS. The operations of 902 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 902 may be performed by a UE as described with reference to Figure 6.

[0174] At 904, the method may include receiving a second configuration comprising a second indication of a UL sub-band. The operations of 904 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 904 may be performed by a UE as described with reference to Figure 6.

[0175] At 906, the method may include determining a second set of frequency resources for the SRS based on the first configuration and the second configuration. The operations of 906 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 906 may be performed by a UE as described with reference to Figure 6.

[0176] At 908, the method may include transmitting the SRS on the second set of frequency resources in response to a condition associated with the second set of frequency resources being satisfied. The operations of 908 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 908 may be performed by a UE as described with reference to Figure 6.

[0177] It should be noted that the method described herein describes a possible implementation, and that the operations and the steps may be rearranged or otherwise modified and that other implementations are possible.

[0178] Figure 10 illustrates a flowchart of a method in accordance with aspects of the present disclosure. The operations of the method may be implemented by an NE as described herein. In some implementations, the NE may execute a set of instructions to control the function elements of the NE to perform the described functions.

[0179] At 1002, the method may include transmitting a first configuration comprising a first indication of a first set of frequency resources for an SRS. The operations of 1002 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1002 may be performed by an NE as described with reference to Figure 8.

[0180] At 1004, the method may include transmitting a second configuration comprising a second indication of a UL sub-band, wherein a second set of frequency resources for the SRS is based on the first configuration and the second configuration. The operations of 1004 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1004 may be performed by an NE as described with reference to Figure 8.

[0181] At 1006, the method may include receiving the SRS on the second set of frequency resources in response to a condition associated with the second set of frequency resources being satisfied. The operations of 1006 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1006 may be performed by an NE as described with reference to Figure 8.

[0182] It should be noted that the method described herein describes a possible implementation, and that the operations and the steps may be rearranged or otherwise modified and that other implementations are possible.

[0183] Figure 11 illustrates a flowchart of a method in accordance with aspects of the present disclosure. The operations of the method may be implemented by a UE as described herein. In some implementations, the UE may execute a set of instructions to control the function elements of the UE to perform the described functions.

[0184] At 1102, the method may include receiving a first configuration for an SRS, wherein the first configuration comprises: one or more first FH parameters associated withtransmitting the SRS on first resources not associated with an SBFD operation, and one or more second FH parameters associated with transmitting the SRS on second resources associated with the SBFD operation. The operations of 1102 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1102 may be performed by a UE as described with reference to Figure 6.

[0185] At 1104, the method may include determining whether an SRS transmission occurs on the first resources or the second resources. The operations of 1104 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1104 may be performed by a UE as described with reference to Figure 6.

[0186] At 1106, the method may include transmitting the SRS using a first FH subband index based on the one or more first FH parameters when the SRS transmission occurs on the first resources, or transmitting the SRS using a second FH sub-band index based on the one or more second FH parameters when the SRS transmission occurs on the second resources. The operations of 1106 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1106 may be performed by a UE as described with reference to Figure 6.

[0187] It should be noted that the method described herein describes a possible implementation, and that the operations and the steps may be rearranged or otherwise modified and that other implementations are possible.

[0188] The description herein is provided to enable a person having ordinary skill in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to a person having ordinary skill in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.

Claims

CLAIMSWhat is claimed is:

1. A user equipment (UE) for wireless communication, comprising: at least one memory; and at least one processor coupled with the at least one memory and configured to cause the UE to: receive a first configuration comprising a first indication of a first set of frequency resources for a sounding reference signal (SRS); receive a second configuration comprising a second indication of an uplink (UL) sub-band; determine a second set of frequency resources for the SRS based on the first configuration and the second configuration; and transmit the SRS on the second set of frequency resources in response to a condition associated with the second set of frequency resources being satisfied.

2. The UE of claim 1, wherein one or more of the first set of frequency resources or the second set of frequency resources comprise physical resource blocks (PRBs).

3. The UE of claim 1, wherein the second configuration is associated with a subband full-duplex (SBFD) operation for the UL sub-band.

4. The UE of claim 1, wherein the first configuration or the second configuration indicates the condition associated with the second set of frequency resources.

5. The UE of claim 1, wherein the condition associated with the second set of frequency resources is satisfied in response to a quantity of the second set of frequency resources being above a threshold quantity of frequency resources.

6. The UE of claim 1, wherein the condition associated with the second set of frequency resources is satisfied in response to a quantity of resource elements (REs) on the second set of frequency resources being divisible by one or more prime numbers.

7. The UE of claim 1, wherein the condition associated with the second set of frequency resources is satisfied in response to a quantity of resource elements (REs) on the second set of frequency resources being divisible by an integer.

8. The UE of claim 1, wherein the at least one processor is further configured to cause the UE to: determine an error case when the condition associated with the second set of frequency resources is not satisfied.

9. The UE of claim 8, wherein, in response to determining the error case when the condition associated with the second set of frequency resources is not satisfied, the at least one processor is further configured to cause the UE to: not transmit the SRS; not transmit the SRS for one occasion; not transmit the SRS for a number of occasions; not transmit the SRS for a duration; not transmit the SRS until the condition is satisfied; transmit the SRS on a best-effort basis; disregard the first configuration or the first indication; or disregard the second configuration or the second indication.

10. The UE of claim 1 , wherein, in response to determining that the condition associated with the second set of frequency resources is not satisfied, the at least one processor is further configured to cause the UE to: transmit an indication of a cause for the error, wherein the indication is transmitted in uplink control information (UCI) or a medium access control (MAC) control element (CE).

11. The UE of claim 1, wherein the first configuration and the second configuration are a radio resource control (RRC) configuration.

12. The UE of claim 1, wherein the at least one processor is configured to receive the second indication via a downlink control information (DCI) or a medium access control (MAC) control element (CE).

13. A method performed by a user equipment (UE), the method comprising: receiving a first configuration comprising a first indication of a first set of frequency resources for a sounding reference signal (SRS); receiving a second configuration comprising a second indication of an uplink (UL) sub-band; determining a second set of frequency resources for the SRS based on the first configuration and the second configuration; and transmitting the SRS on the second set of frequency resources in response to a condition associated with the second set of frequency resources being satisfied.

14. The method of claim 13, wherein one or more of the first set of frequency resources or the second set of frequency resources comprise physical resource blocks (PRBs).

15. The method of claim 13, wherein the second configuration is associated with a sub-band full-duplex (SBFD) operation for the UL sub-band.

16. The method of claim 13, wherein the first configuration or the second configuration indicates the condition associated with the second set of frequency resources.

17. The method of claim 13, wherein the condition associated with the second set of frequency resources is satisfied in response to a quantity of the second set of frequency resources being above a threshold quantity of frequency resources.

18. A network entity for wireless communication, comprising: at least one memory; and at least one processor coupled with the at least one memory and configured to cause the network entity to: transmit a first configuration comprising a first indication of a first set of frequency resources for a sounding reference signal (SRS); transmit a second configuration comprising a second indication of an uplink (UL) sub-band, wherein a second set of frequency resources for the SRS is based on the first configuration and the second configuration; and receive the SRS on the second set of frequency resources in response to a condition associated with the second set of frequency resources being satisfied.

19. The network entity of claim 18, wherein the at least one processor is configured to transmit the second indication via a downlink control information (DCI) or a medium access control (MAC) control element (CE).

20. A method performed by a network entity, the method comprising: transmitting a first configuration comprising a first indication of a first set of frequency resources for a sounding reference signal (SRS); transmitting a second configuration comprising a second indication of an uplink (UL) sub-band, wherein a second set of frequency resources for the SRS is based on the first configuration and the second configuration; and receiving the SRS on the second set of frequency resources in response to a condition associated with the second set of frequency resources being satisfied.

Images