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WO2024087743A1 - Procédés et appareils pour srs avec saut de cs et/ou saut de décalage de peigne - Google Patents

Procédés et appareils pour srs avec saut de cs et/ou saut de décalage de peigne Download PDF

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Publication number
WO2024087743A1
WO2024087743A1 PCT/CN2023/107544 CN2023107544W WO2024087743A1 WO 2024087743 A1 WO2024087743 A1 WO 2024087743A1 CN 2023107544 W CN2023107544 W CN 2023107544W WO 2024087743 A1 WO2024087743 A1 WO 2024087743A1
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Prior art keywords
srs
comb
subset
initial
css
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English (en)
Inventor
Yi Zhang
Chenxi Zhu
Bingchao LIU
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Lenovo Beijing Ltd
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Lenovo Beijing Ltd
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Priority to PCT/CN2023/107544 priority Critical patent/WO2024087743A1/fr
Publication of WO2024087743A1 publication Critical patent/WO2024087743A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • H04L5/0012—Hopping in multicarrier systems

Definitions

  • the present disclosure relates to wireless communications, and more specifically to methods and apparatuses for sounding reference signal (SRS) with cyclic shift (CS) hopping and/or comb offset hopping.
  • SRS sounding reference signal
  • CS cyclic shift
  • a wireless communications system may include one or multiple network communication devices, such as base stations (BSs) , 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 communication system (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers, or the like) .
  • 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) ) .
  • 3G third generation
  • 4G fourth generation
  • 5G fifth generation
  • 6G sixth generation
  • 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.
  • Some implementations of the methods and apparatuses described herein may include a UE for wireless communication.
  • the UE may include: 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 indication for indicating an initial CS and an initial comb offset for SRS transmission; determine a CS for each SRS port based on the initial CS and determine a comb offset for each SRS port based on the initial comb offset, wherein the CS is determined further based on a CS hop value or the comb offset is determined further based on a comb offset hop value; and perform an SRS transmission based on the determined CS (s) and determined comb offset (s) .
  • the CS for each SRS port is determined further based on a CS hop value, and in the case that a number of SRS ports is 4: the determined CS for a first SRS port is restricted in a subset of a first set when the initial CS is within the first set, and is restricted in a subset of a second set when the initial CS is within the second set, wherein the first set is the second set is and is a maximum number of CSs for SRS transmission, and the comb offsets for a second SRS port and a fourth SRS port are determined further based on whether the initial CS is within the first set or the second set when the maximum number of CSs for SRS transmission is not 6.
  • the CS for each SRS port is determined further based on a CS hop value, and in the case that a number of SRS ports is 4 and a maximum number of CSs for SRS transmission is not 6, the comb offsets for a second SRS port and a fourth SRS port are determined further based on whether the determined CS for a first SRS port is within is a maximum number of CSs for SRS transmission.
  • the CS for each SRS port is determined further based on a CS hop value, the determined CS is restricted in a subset of CSs, and the CS is determined by an index of the CS in the subset of CSs.
  • the index of the CS in the subset of CSs is determined based on an index of the initial CS in the subset of CSs and the CS hop value, and wherein: the index of the initial CS in the subset of CSs is derived from the initial CS indicated by the first indication, or is explicitly indicated by the first indication.
  • the CS for each SRS port is determined further based on a CS hop value, the determined CS is restricted in a first subset of CSs, the initial CS is within a second subset of CSs, and the CS hop value is within the first subset of CSs.
  • the second subset of CSs is ⁇ 0, 2, 4, 6 ⁇ ; in the case that the first subset of CSs is ⁇ 0, 3 ⁇ or ⁇ 1, 4 ⁇ or ⁇ 1, 5 ⁇ when the maximum number of CSs for SRS transmission is 6, the second subset of CSs is ⁇ 0, 3 ⁇ ; or in the case that the first subset of CSs is ⁇ 0, 3, 6, 9 ⁇ or ⁇ 1, 4, 7, 10 ⁇ or ⁇ 2, 5, 8, 11 ⁇ when the maximum number of CSs for SRS transmission is 12, the second subset of CSs is ⁇ 0, 3, 6, 9 ⁇ .
  • the CS for each SRS port is determined based on the initial CS, the CS hop value, and a granularity parameter.
  • the initial CS is selected from a set of CSs which is and in the case that a number of SRS ports is 4, the determined CS for a first SRS port is restricted in a subset of a first part of the set of CSs when the initial CS is within the first part, and is restricted in a subset of a second part of the set of the CSs when the initial CS is within the second part, wherein the first part is the second part is is a maximum number of CSs for SRS transmission, and K is the granularity parameter.
  • the comb offsets for a second SRS port and a fourth SRS port are determined further based on whether the initial CS is within the first part or the second part.
  • the comb offsets for a second SRS port and a fourth SRS port are determined further based on whether the determined CS for a first SRS port is within wherein is a maximum number of CSs for SRS transmission and K is the granularity parameter.
  • the comb offset for each SRS port is determined further based on a comb offset hop value, the determined comb offset is restricted in a subset of comb offsets, and the comb offset is determined by an index of the comb offset in the subset of comb offsets.
  • the index of the comb offset in the subset of comb offsets is determined based on an index of the initial comb offset in the subset of comb offsets and the comb offset hop value, and wherein: the index of the initial comb offset in the subset of comb offsets is derived from the initial comb offset indicated by the first indication, or is explicitly indicated by the first indication.
  • the comb offset for each SRS port is determined further based on a comb offset hop value, the determined comb offset is restricted in a first subset of comb offsets, the initial comb offset is within a second subset of comb offsets, and the comb offset hop value within the first subset of comb offsets.
  • the second subset of comb offsets in the case that the first subset of comb offsets is ⁇ 0, 2 ⁇ or ⁇ 1, 3 ⁇ when a number of transmission combs for SRS transmission is 4, the second subset of comb offsets is ⁇ 0, 2 ⁇ ; or in the case that the first subset of comb offsets is ⁇ 0, 2, 4, 6 ⁇ or ⁇ 1, 3, 5, 7 ⁇ when the number of transmission combs for SRS transmission is 8, the second subset of comb offsets is ⁇ 0, 2, 4, 6 ⁇ .
  • the first indication is received via downlink control information (DCI) or medium access control (MAC) control element (CE) for aperiodic SRS.
  • DCI downlink control information
  • MAC medium access control
  • CE control element
  • the at least one processor is further configured to cause the UE to receive a second indication indicating a subset of CSs for initial CS or a subset of comb offsets for initial comb offset, and the first indication includes an index of the initial CS in the subset of CSs or an index of the initial comb offset in the subset of comb offsets.
  • the at least one processor is further configured to cause the UE to receive DCI or a MAC CE indicating an index of a subset of CSs in a plurality of subsets of CSs or an index of a subset of comb offsets in a plurality of subsets of comb offsets for aperiodic SRS, and the first indication indicates a CS in the subset of CSs as the initial CS or indicates a comb offset in the subset of comb offsets as the initial comb offset.
  • Some implementations of the methods and apparatuses described herein may include a processor for wireless communication.
  • the processor may include: at least one controller coupled with at least one memory and configured to cause the processor to: receive a first indication for indicating an initial CS and an initial comb offset for SRS transmission; determine a CS for each SRS port based on the initial CS and determine a comb offset for each SRS port based on the initial comb offset, wherein the CS is determined further based on a CS hop value or the comb offset is determined further based on a comb offset hop value; and perform an SRS transmission based on the determined CS (s) and determined comb offset (s) .
  • the BS may include: at least one memory; and at least one processor coupled with the at least one memory and configured to cause the BS to: transmit a first indication for indicating an initial CS and an initial comb offset for SRS transmission; determine a CS for each SRS port based on the initial CS and determine a comb offset for each SRS port based on the initial comb offset, wherein the CS is determined further based on a CS hop value or the comb offset is determined further based on a comb offset hop value; and receive an SRS transmission based on the determined CS (s) and determined comb offset (s) .
  • the first indication is transmitted via DCI or MAC CE for aperiodic SRS.
  • the at least one processor is further configured to cause the BS to transmit a second indication indicating a subset of CSs for initial CS or a subset of comb offsets for initial comb offset, and the first indication includes an index of the initial CS in the subset of CSs or an index of the initial comb offset in the subset of comb offsets.
  • the at least one processor is further configured to cause the BS to transmit DCI or a MAC CE indicating an index of a subset of CSs in a plurality of subsets of CSs or an index of a subset of comb offsets in a plurality of subsets of comb offsets for aperiodic SRS, and the first indication indicates a CS in the subset of CSs as the initial CS or indicates a comb offset in the subset of comb offsets as the initial comb offset.
  • Some implementations of the methods and apparatuses described herein may include a method performed by a UE.
  • the method may include: receiving a first indication for indicating an initial CS and an initial comb offset for SRS transmission; determining a CS for each SRS port based on the initial CS and determining a comb offset for each SRS port based on the initial comb offset, wherein the CS is determined further based on a CS hop value or the comb offset is determined further based on a comb offset hop value; and performing an SRS transmission based on the determined CS (s) and determined comb offset (s) .
  • Some implementations of the methods and apparatuses described herein may include a method performed by a BS.
  • the method may include: transmitting a first indication for indicating an initial CS and an initial comb offset for SRS transmission; determining a CS for each SRS port based on the initial CS and determining a comb offset for each SRS port based on the initial comb offset, wherein the CS is determined further based on a CS hop value or the comb offset is determined further based on a comb offset hop value; and receiving an SRS transmission based on the determined CS (s) and determined comb offset (s) .
  • Figure 1 illustrates an example of a wireless communications system in accordance with aspects of the present disclosure.
  • Figure 2 illustrates a flowchart of an exemplary method performed by a UE in accordance with aspects of the present disclosure.
  • FIG. 3 illustrates a flowchart of an exemplary method performed by a BS in accordance with aspects of the present disclosure.
  • Figure 4 illustrates an example of a UE in accordance with aspects of the present disclosure.
  • Figure 5 illustrates an example of a processor in accordance with aspects of the present disclosure.
  • Figure 6 illustrates an example of a BS in accordance with aspects of the present disclosure.
  • FIG. 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 network equipments (NEs) (e.g., BSs) 102, one or more UEs 104, and a core network (CN) 106.
  • the wireless communications system 100 may support various radio access technologies.
  • the wireless communications system 100 may be a 4G network, such as an LTE network or an LTE-Advanced (LTE-A) network.
  • LTE-A LTE-Advanced
  • 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.
  • 5G-A 5G-Advanced
  • 5G-UWB 5G ultrawideband
  • 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.
  • IEEE Institute of Electrical and Electronics Engineers
  • Wi-Fi Wi-Fi
  • WiMAX IEEE 802.16
  • 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.
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • CDMA code division multiple access
  • the one or more NEs 102 may be dispersed throughout a geographic region to form the wireless communications system 100.
  • One or more of the NEs 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 or wired connection.
  • an NE 102 and a UE 104 may perform wireless communication (e.g., receive signaling, transmit signaling) over a Uu interface.
  • 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.
  • 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.
  • an NE 102 may be moveable, for example, a satellite associated with a non-terrestrial network (NTN) .
  • NTN non-terrestrial network
  • 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 NEs 102.
  • the one or more UEs 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.
  • the UE 104 may be referred to as a unit, a station, a terminal, or a client, among other examples.
  • the UE 104 may be referred to as an Internet-of-Things (IoT) device, an Internet-of-Everything (IoE) device, or machine-type communication (MTC) device, among other examples.
  • IoT Internet-of-Things
  • IoE Internet-of-Everything
  • MTC machine-type communication
  • a UE 104 may be able to support wireless communication directly with other UEs 104 over a communication link.
  • a UE 104 may support wireless communication directly with another UE 104 over a device-to-device (D2D) communication link.
  • D2D device-to-device
  • the communication link may be referred to as a sidelink.
  • a UE 104 may support wireless communication directly with another UE 104 over a PC5 interface.
  • An NE 102 may support communications with the CN 106, or with another NE 102, or both.
  • an NE 102 may interface with other NE 102 or the CN 106 through one or more backhaul links (e.g., S1, N2, N2, or network interface) .
  • the NEs 102 may communicate with each other directly.
  • the NEs 102 may communicate with each other indirectly (e.g., via the CN 106.
  • one or more NEs 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 radio heads, smart radio heads, or transmission-reception points (TRPs) .
  • TRPs transmission-reception points
  • 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 function (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) ) .
  • EPC evolved packet core
  • 5GC 5G core
  • MME mobility management entity
  • AMF access and mobility management function
  • S-GW serving gateway
  • PDN gateway Packet Data Network gateway
  • UPF user plane function
  • 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 NEs 102 associated with the CN 106.
  • NAS non-access stratum
  • the CN 106 may communicate with a packet data network over one or more backhaul links (e.g., via an S1, N2, N2, or another network interface) .
  • the packet data network may include an application server.
  • 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) .
  • 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) .
  • the NEs 102 and the UEs 104 may support different resource structures.
  • the NEs 102 and the UEs 104 may support different frame structures.
  • the NEs 102 and the UEs 104 may support a single frame structure.
  • the NEs 102 and the UEs 104 may support various frame structures (e.g., multiple frame structures) .
  • the NEs 102 and the UEs 104 may support various frame structures based on one or more numerologies.
  • 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 subcarrier spacing e.g., 15 kHz
  • a normal cyclic prefix e.g. 15 kHz
  • the first numerology associated with the first subcarrier spacing (e.g., 15 kHz) may utilize one slot per subframe.
  • a time interval of a 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.
  • each frame may include multiple subframes.
  • each frame may include 10 subframes, and each subframe may have a duration, for example, a 1 ms duration.
  • each frame may have the same duration.
  • each subframe of a frame may have the same duration.
  • a time interval of a resource may be organized according to slots.
  • 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.
  • Each slot may include a number (e.g., quantity) of symbols (e.g., orthogonal frequency division multiplexing (OFDM) symbols) .
  • the number (e.g., quantity) of slots for a subframe may depend on a numerology.
  • a slot For a normal cyclic prefix, a slot may include 14 symbols.
  • a slot For an extended cyclic prefix (e.g., applicable for 60 kHz subcarrier spacing) , a slot may include 12 symbols.
  • an electromagnetic (EM) spectrum may be split, based on frequency or wavelength, into various classes, frequency bands, frequency channels, etc.
  • 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) .
  • 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
  • FR5 114.25 GHz
  • the NEs 102 and the UEs 104 may perform wireless communications over one or more of the operating frequency bands.
  • 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) .
  • FR2 may be used by the NEs 102 and the UEs 104, among other equipment or devices for short-range, high data rate capabilities.
  • FR1 may be associated with one or multiple numerologies (e.g., at least three numerologies) .
  • FR2 may be associated with one or multiple numerologies (e.g., at least 2 numerologies) .
  • SRS which is an uplink reference signal transmitted from a UE to a BS, is generally used for uplink channel quality estimation.
  • SRS may be also used to obtain downlink (DL) channel state information (CSI) by exploiting channel reciprocity.
  • CSI channel state information
  • PMI quantized precoding matrix indicator
  • the uplink signal to interference plus noise ratio (SINR) and channel quality may be too low to perform SRS-based channel measurement with sufficient resolution, especially for power-limited UEs.
  • SINR uplink signal to interference plus noise ratio
  • SRS enhancement with CS hopping and/or comb offset hopping may be used to manage inter-TRP cross-SRS interference.
  • An SRS resource refers to a time-frequency resource configured for SRS transmission.
  • a sequence for SRS transmission on an SRS resource may be generated based on CS and comb offset for each antenna port (also referred to as SRS port) of the SRS resource.
  • a hopping pattern may be determined based on a pseudo-random sequence when CS hopping and/or comb offset hopping is applied.
  • the specific schemes for determining a CS and/or a comb offset for enhanced SRS with CS hopping and/or comb offset hopping have not been fully discussed.
  • feature 1 is to support configuring a subset of comb offsets when comb offset hopping is configured and configuring a subset of CSs when CS hopping is configured;
  • feature 2 is to support CS hopping with finer granularity;
  • feature 3 is to support configuring comb offset hopping and CS hopping for an SRS resource at the same time.
  • the specific schemes for determining a CS and/or a comb offset for enhanced SRS which supports the above features have not been fully discussed.
  • Embodiments of the present disclosure provide CS determination schemes and/or comb offset determination schemes for enhanced SRS with CS hopping and/or comb offset hopping.
  • the CS determination schemes and/or comb offset determination schemes considers the above features. For example, they consider the initial comb offset determination schemes in case of 4-port SRS, the impact (s) from a restricted subset of CSs and/or a restricted subset of comb offset, or how to indicate initial CS (s) and/or initial comb offset (s) for aperiodic SRS with CS hopping and/or comb offset hopping. More details will be described in the following text in combination with the appended drawings.
  • Figure 2 illustrates a flowchart of an exemplary method in accordance with aspects of the present disclosure.
  • the operations of the method illustrated in Figure 2 may be performed by a UE (e.g., UE 104 in Figure 1) as described herein or other apparatus with the like functions.
  • the UE may execute a set of instructions to control functional elements of the UE to perform the described operations or functions.
  • the UE may receive a first indication for indicating an initial CS and an initial comb offset for SRS transmission.
  • the first indication may include a higher-layer parameter (e.g., transmissionComb as specified in 3GPP standard documents or a new parameter similar to transmissionComb) .
  • the UE may determine a CS for each SRS port based on the initial CS and determine a comb offset for each SRS port based on the initial comb offset.
  • the CS may be determined further based on a CS hop value (also referred to as a CS hop offset) , which means that CS hopping is configured or applied.
  • the comb offset maybe determined further based on a comb offset hop value (also referred to as a comb hop offset) , which means that comb offset hopping is configured or applied. It is contemplated that CS hopping and comb offset hopping can be configured or applied separately or simultaneously.
  • the UE may determine a CS for each SRS port based on the initial CS and the CS hop value, and determine a comb offset for each SRS port based on the initial comb offset without the comb offset hop value in step 204.
  • the UE may determine a comb offset for each SRS port based on the initial comb offset and the comb offset hop value, and determine a CS for each SRS port based on the initial CS without the CS hop value in step 204.
  • the UE may determine a CS for each SRS port based on the initial CS and the CS hop value, and determine a comb offset for each SRS port based on the initial comb offset and the comb offset hop value in step 204.
  • the UE may perform an SRS transmission based on the determined CS (s) and determined comb offset (s) . For example, the UE may transmit SRS on each SRS port using the determined CS and comb offset for that SRS port.
  • the following embodiments provide solutions regarding how to determine the CS (s) and comb offset (s) for SRS transmission when CS hopping and/or comb offset hopping is configured.
  • Embodiment 1 provides solutions for CS determination and comb offset determination when CS hopping is configured for SRS transmission, which may be divided into Embodiment 1-1, Embodiment 1-2, and Embodiment 1-3.
  • Embodiment 1-1 provides solutions for CS determination and comb offset determination when CS hopping is configured for SRS transmission but the CS after hopping is not restricted in a subset of CSs, i.e., for CS hopping without a subset restriction.
  • the UE may determine a CS for each SRS port based on the initial CS and the CS hop value.
  • the CS hop value may be determined based on a pseudo-random sequence.
  • a CS for an SRS port p i may be represented by which is determined based on the following equation (1) :
  • Equation (1) is the number of SRS ports (e.g., denoted as ) and is given by a higher-layer parameter (e.g., nrofSRS-Ports as specified in 3GPP standard documents) if configured, otherwise
  • p i 1000+i when the SRS resource is in an SRS resource set with a higher-layer parameter usage in SRS-ResourceSet not set to 'nonCodebook, ' or determined according to TS 38.214 when the SRS resource is in an SRS resource set with a higher-layer parameter usage in SRS-ResourceSet set to 'nonCodebook.
  • CS is the initial CS indicated by the first indication received in step 202.
  • a higher-layer parameter e.g., transmissionComb as specified in 3GPP standard documents
  • the maximum numbers of CSs can be given by the following Table 1, which is the same as Table 6.4.1.4.2-1 in TS 38.211.
  • K TC a number of transmission combs (e.g., denoted as K TC ) for the SRS resource.
  • K TC is contained in a higher-layer parameter (e.g., transmissionComb as specified in 3GPP standard documents) .
  • CS hop value is the CS hop value.
  • CS hop value may be determined based on the following equation (2) :
  • c (i) is a pseudo-random sequence defined by clause 5.2.1 in TS 38.211, is the maximum number of CSs for SRS transmission, SFN is a system frame number, is the number of slots in a frame, is the number of symbols in a slot, is a slot number, l' is an OFDM symbol number within the SRS resource and is the number of consecutive OFDM symbols in the SRS resource, wherein and is given by the field nrofSymbols contained in the higher-layer parameter resourceMapping as specified in 3GPP standard documents.
  • Equation (2) The value of "t" in equation (2) may be determined in other manners, e.g., based on the following equation (2a) :
  • Equation (2a) is the starting position of the SRS resource in the time domain given by where the offset l offset ⁇ ⁇ 0, 1, ..., 13 ⁇ counts symbols backwards from the end of the slot and is given by the field startPosition contained in the higher-layer parameter resourceMapping and Other parameters in equation (2a) may have the same definitions as those in equation (2) .
  • the comb offset for each SRS port may be determined by the following scheme 1 or scheme 2.
  • the comb offset for each SRS port may be determined in the same manner as the case without CS hopping.
  • the number of SRS ports is 4 (e.g., the SRS ports are 1000, 1001, 1002, and 1003, respectively) and the maximum number of CSs for SRS transmission is not 6, the comb offsets for the second SRS port (e.g., SRS port 1001) and the fourth SRS port (e.g., SRS port 1003) are determined further based on whether the initial CS is within a first set or a second set.
  • the first set may be and the second set may be wherein is the maximum number of CSs for SRS transmission.
  • a comb offset for an SRS port p i may be represented by which is determined based on the following equation (3) :
  • Equation (3) is the initial comb offset indicated by the first indication received in step 202.
  • K TC is the number of transmission combs for the SRS resource and is contained in a higher-layer parameter (e.g., transmissionComb as specified in 3GPP standard documents) .
  • K TC may have the values as shown in Table 1.
  • Other parameters in equation (3) may have the same definitions as those in equation (1) .
  • Scheme 1 may increase potential SRS pattern number, wherein additional SRS pattern may include the same comb offset for 4-port SRS in case of and different comb offsets for 4-port SRS in case of wherein is the determined CS (i.e., CS after hopping) for the first SRS port (e.g., SRS port 1000) .
  • This will increase the complexity of interference management between SRS without CS hopping and SRS with CS hopping.
  • the determined CS for the first SRS port may be restricted in a subset of the first set (e.g., ) when the initial CS is within the first set, and restricted in a subset of the second set (e.g., ) when the initial CS is within the second set.
  • Such restriction may reduce the complexity of interference coordination between SRS with CS hopping and SRS without CS hopping.
  • the comb offsets for the second SRS port (e.g., SRS port 1001) and the fourth SRS port (e.g., SRS port 1003) are determined further based on whether the determined CS (i.e., CS after hopping) for the first SRS port (e.g., SRS port 1000) is within
  • a comb offset for an SRS port p i may be represented by which is determined based on the following equation (4) :
  • equation (4) is the determined CS for the first SRS port (e.g., SRS port 1000) , for example, may be determined based on equation (1) .
  • Other parameters in equation (4) may have the same definitions as those in equation (3) .
  • Embodiment 1-1 may include the case with comb offset hopping (i.e., both CS hopping and comb offset hopping are configured) , and scheme 1 and scheme 2 may also be applied in such case, which will be described in more details in Embodiment 2.
  • Embodiment 1-2 provides solutions for CS determination and comb offset determination when CS hopping is configured for SRS transmission and the CS after hopping is restricted in a subset of CSs, i.e., for CS hopping with a subset restriction.
  • Such subset restriction may mitigate interference between enhanced SRS with CS hopping and legacy SRS without CS hopping, and mitigate interference between SRS from different cells.
  • Alt. 1 and Alt. 2 There are two alternatives (i.e., Alt. 1 and Alt. 2) for determining CS for each SRS port in Embodiment 1-2.
  • the UE may determine the CS for each SRS port based on the initial CS and the CS hop value, and the determined CS (i.e., the CS after hopping) is restricted in a subset of CSs.
  • the CS may be determined by an index of the CS in the subset of CSs.
  • the index of the CS in the subset of CSs may be determined based on an index of the initial CS in the subset of CSs and the CS hop value.
  • a CS for an SRS port p i may be represented by which is determined based on the following equation (5) :
  • Equation (5) is an index of the initial CS (e.g., ) in the subset of CSs and N is the number of CSs included in the subset of CS. is the CS hop value.
  • N is the number of CSs included in the subset of CS.
  • the CS hop value may be determined based on a pseudo-random sequence. For example, may be determined based on the following equation (6) :
  • equation (6) may have the same definitions as those in equation (2) . It is contemplated that the value of "t" in equation (6) may be determined in other manners, e.g., based on the aforementioned equation (2a) .
  • f (x) is a mapping function which is used to find a CS in the subset of CSs by its index x.
  • Other parameters in equation (5) may have the same definitions as those in equation (1) .
  • the index of the initial CS in the subset of CSs may be derived from the initial CS indicated by the first indication. For example, assuming that the subset of CSs is ⁇ 0, 2, 4, 6 ⁇ , i.e., the indexes of "0, " "2, “ “4, “ and “6” in the subset of CSs are 0, 1, 2, and 3, respectively, and the initial CS indicated by the first indication is "4, " then the UE can derive that the index of the initial CS in the subset of CSs is 2.
  • the initial CS indicated by the first indication is restricted in the subset of CSs; otherwise, its index in the subset of CSs cannot be derived.
  • the index of the initial CS in the subset of CSs may be explicitly indicated by the first indication.
  • the first indication may indicate "2," which means that the index of the initial CS in the subset of CSs is 2.
  • the first indication may reuse the higher-layer parameter for indicating to indicate the index of the initial CS in the subset of CSs.
  • the first indication may explicitly indicate the index of the initial CS in the subset of CSs using a different higher-layer parameter.
  • the UE may determine the CS for each SRS port based on the initial CS and the CS hop value, the determined CS (i.e., the CS after hopping) is restricted in a first subset of CSs, and the CS hop value is also restricted in the first subset of CSs. That is, the CS hopping is made only for CS hop value within the first subset of CSs.
  • a CS for an SRS port p i may be represented by which is determined based on the following equation (7) :
  • equation (7) is the index of the CS hop value in the first subset of CSs, which may be determined based on a pseudo-random sequence. For example, may be determined based on the aforementioned equation (6) , in which N is the number of CSs included in the first subset of CSs.
  • f (x) is a mapping function which is used to find a CS in the first subset of CSs by its index x. Accordingly, is the CS hop value which is within the first subset of CSs.
  • Other parameters in equation (7) may have the same definitions as those in equation (1) .
  • the first subset of CSs may be ⁇ 0, 2, 4, 6 ⁇ or ⁇ 1, 3, 5, 7 ⁇ when the maximum number of CSs for SRS transmission is 8, ⁇ 0, 3 ⁇ or ⁇ 1, 4 ⁇ or ⁇ 1, 5 ⁇ when the maximum number of CSs for SRS transmission is 6, or ⁇ 0, 3, 6, 9 ⁇ or ⁇ 1, 4, 7, 10 ⁇ or ⁇ 2, 5, 8, 11 ⁇ when the maximum number of CSs for SRS transmission is 12.
  • the second subset of CSs may be ⁇ 0, 2, 4, 6 ⁇ .
  • the second subset of CSs may be ⁇ 0, 3 ⁇ .
  • the second subset of CSs may be ⁇ 0, 3, 6, 9 ⁇ .
  • scheme 1 and scheme 2 as provided in Embodiment 1-1 may also be applied for determining a comb offset for each SRS port in step 204.
  • the subset of CSs for SRS transmission with CS hopping may be configured via various manners.
  • the subset of CSs may be indicated by an indication (e.g., an RRC signaling) .
  • the indication may be a bitmap, wherein each bit may indicate whether a corresponding CS of all possible/candidate CSs is included in the subset of CSs, or may indicate whether a corresponding group of CSs of a plurality of groups of CSs is included in the subset of CSs.
  • Embodiment 1-2 may include the case with comb offset hopping (i.e., both CS hopping and comb offset hopping are configured) .
  • Embodiment 1-3 provides solutions for CS determination and comb offset determination when CS hopping with finer granularity is configured for SRS transmission but the CS after hopping is not restricted in a subset of CSs, i.e., for CS hopping with finer granularity and without a subset restriction.
  • the UE may determine a CS for each SRS port based on the initial CS, the CS hop value, and a granularity parameter.
  • the CS hop value may be determined based on a pseudo-random sequence.
  • a CS for an SRS port p i may be represented by which is determined based on the following equation (8) :
  • K is the granularity parameter which is a positive integer, and is the CS hop value.
  • K may be determined based on a pseudo-random sequence. For example, may be determined based on the following equation (9) :
  • Y is the number of possible CSs for hopping, i.e. and is the maximum number of CSs for SRS transmission.
  • K 1
  • the CS determination scheme falls back to the CS determination scheme for CS hopping without finer granularity (e.g., Embodiment 1-1) .
  • Equation (8) may have the same definitions as those in equation (1) .
  • Other parameters in equation (9) may have the same definitions as those in equation (2) . It is contemplated that the value of "t" in equation (9) may be determined in other manners, e.g., based on the aforementioned equation (2a) .
  • scheme 1 as provided in Embodiment 1-1 can be used to determine the comb offset for each SRS port in the case that the initial CS is selected from However, in the case that the initial CS is selected from the comb offset for each SRS port may be determined by the following scheme 1'.
  • Scheme 1' may be similar to scheme 1.
  • a comb offset for an SRS port p i may be represented by which is determined based on the following equation (10) :
  • equation (10) may have the same definitions as those in equation (3) .
  • the determined CS for the first SRS port may be restricted in a subset of the first part when the initial CS is within the first part, and restricted in a subset of the second part when the initial CS is within the second part.
  • scheme 2' which is similar to scheme 2 as provided in Embodiment 1-1, may be used to determine the comb offset for each SRS port in Embodiment 1-3.
  • a comb offset for an SRS port p i may be represented by which is determined based on the following equation (11) :
  • equation (11) may have the same definitions as those in equation (4) .
  • Embodiment 1-3 may include the case with comb offset hopping (i.e., both CS hopping and comb offset hopping are configured) , and scheme 1' and scheme 2' may also be applied in such case, which will be described in more details in Embodiment 2.
  • Embodiment 2 provides solutions for comb offset determination when comb offset hopping is configured for SRS transmission, which may be divided into Embodiment 2-1 and Embodiment 2-2.
  • Embodiment 2-1 provides solutions for comb offset determination when comb offset hopping is configured for SRS transmission but the comb offset after hopping is not restricted a subset of comb offsets, i.e., for comb offset hopping without a subset restriction.
  • the UE may determine a comb offset for each SRS port based on the initial comb offset and the comb offset hop value.
  • the comb offset hop value may be determined based on a pseudo-random sequence.
  • a comb offset for an SRS port p i may be represented by which is determined based on the following equation (12) :
  • equation (12) is the comb offset hop value.
  • equation (12) is the comb offset hop value.
  • equation (12) may be determined based on the following equation (13) :
  • K TC is the number of transmission combs for the SRS resource and is contained in a higher-layer parameter (e.g., transmissionComb as specified in 3GPP standard documents) .
  • K TC may have the values as shown in Table 1.
  • Other parameters in equation (13) may have the same definitions as those in equation (2) .
  • Other parameters in equation (12) may have the same definitions as those in equation (3) .
  • equation (13) may be determined in other manners, e.g., based on the aforementioned equation (2a) .
  • Embodiment 2-1 may include the case with CS hopping (i.e., both CS hopping and comb offset hopping are configured) , and scheme 1 and scheme 2 as provided in Embodiment 1-1 and scheme 1' and scheme 2' as provided in Embodiment 1-3 may also be applied in such case.
  • the comb offsets for the second SRS port (e.g., SRS port 1001) and the fourth SRS port (e.g., SRS port 1003) may be determined further based on whether the determined CS for the first SRS port (e.g., SRS port 1000) is within wherein is the maximum number of CSs for SRS transmission.
  • a comb offset for an SRS port p i may be represented by which is determined based on the following equation (14) :
  • equation (4) is the determined CS for the first SRS port (e.g., SRS port 1000) .
  • SRS port 1000 e.g., SRS port 1000
  • Other parameters in equation (14) may have the same definitions as those in equation (12) .
  • the comb offsets for the second SRS port (e.g., SRS port 1001) and the fourth SRS port (e.g., SRS port 1003) may be determined further based on whether the determined CS for the first SRS port (e.g., SRS port 1000) is within wherein is the maximum number of CSs for SRS transmission, and K is the granularity parameter as described above.
  • a comb offset for an SRS port p i may be represented by which is determined based on the following equation (15) :
  • equation (15) is the determined CS for the first SRS port (e.g., SRS port 1000) , for example, may be determined based on any solution in Embodiments 1-1, 1-2, and 1-3.
  • Other parameters in equation (15) may have the same definitions as those in equation (12) .
  • Embodiment 2-2 provides solutions for comb offset determination when comb offset hopping is configured and the comb offset after hopping is restricted in a subset of comb offsets, i.e., for comb offset hopping with a subset restriction.
  • Such subset restriction may mitigate interference between enhanced SRS with comb offset hopping and legacy SRS without comb offset hopping, and mitigate interference between SRS from different cells.
  • the UE may determine the comb offset for each SRS port based on the initial comb offset and the comb offset hop value, and the determined comb offset (i.e., the comb offset after hopping) is restricted in a subset of comb offsets.
  • the comb offset may be determined by an index of the comb offset in the subset of comb offsets.
  • the index of the comb offset in the subset of comb offsets may be determined based on an index of the initial comb offset in the subset of comb offsets and the comb offset hop value.
  • a comb offset for an SRS port p i may be represented by which is determined based on the following equation (16) :
  • Equation (16) is an index of the initial comb offset (e.g., ) in the subset of comb offsets and M is the number of comboffsets included in the subset of comb offsets. is the comb offset hop value.
  • M is the number of comboffsets included in the subset of comb offsets.
  • the comb offset hop value may be determined based on a pseudo-random sequence. For example, may be determined based on the following equation (17) :
  • equation (17) may have the same definitions as those in equation (13) .
  • f (x) is a mapping function which is used to find a comb offset in the subset of comb offsets by its index x.
  • Other parameters in equation (16) may have the same definitions as those in equation (12) .
  • equation (17) may be determined in other manners, e.g., based on the aforementioned equation (2a) .
  • the index of the initial comb offset in the subset of comb offsets may be derived from the initial comb offset indicated by the first indication. For example, assuming that the subset of comb offsets is ⁇ 1, 3 ⁇ , i.e., the indexes of "1" and “3" in the subset of comb offsets are 0 and 1, respectively, and the initial comb offset indicated by the first indication is "3, " then the UE can derive that the index of the initial comb offset in the subset of comb offsets is 1.
  • the initial comb offset indicated by the first indication is restricted in the subset of comb offsets; otherwise, its index in the subset of comb offsets cannot be derived.
  • the index of the initial comb offset in the subset of comb offsets may be explicitly indicated by the first indication.
  • the first indication may indicate "2, " which means that the index of the initial comb offset in the subset of comb offsets is 2.
  • the first indication may reuse the higher-layer parameter for indicating to indicate the index of the initial comb offset in the subset of comb offsets.
  • the first indication may explicitly indicate the index of the initial comb offset in the subset of comb offsets using a different higher-layer parameter.
  • the UE may determine the comb offset for each SRS port based on the initial comb offset and the comb offset hop value, the determined comb offset (i.e., the comb offset after hopping) is restricted in a first subset of comb offsets, and the comb offset hop value is also restricted in the first subset of comb offsets. That is, the comb offset hopping is made only for comb offset hop value within the first subset of comb offsets.
  • a comb offset for an SRS port p i may be represented by which is determined based on the following equation (18) :
  • equation (18) is the index of the comb offset hop value in the first subset of comb offsets, which may be determined based on a pseudo-random sequence. For example, may be determined based on the aforementioned equation (17) , in which N is the number of comb offsets included in the first subset of comb offsets.
  • f (x) is a mapping function which is used to find a comb offset in the first subset of comb offsets by its index x. Accordingly, is the comb offset hop value which is within the first subset of comb offsets.
  • Other parameters in equation (18) may have the same definitions as those in equation (16) .
  • the first subset of comb offsets may be ⁇ 0, 2 ⁇ or ⁇ 1, 3 ⁇ when the number of transmission combs for SRS transmission is 4, or ⁇ 0, 2, 4, 6 ⁇ or ⁇ 1, 3, 5, 7 ⁇ when the number of transmission combs for SRS transmission is 8.
  • the second subset of comb offsets may be ⁇ 0, 2 ⁇ .
  • the first subset of comb offsets may be ⁇ 0, 2, 4, 6 ⁇ or ⁇ 1, 3, 5, 7 ⁇ when the number of transmission combs for SRS transmission is 8, the second subset of comb offsets may be ⁇ 0, 2, 4, 6 ⁇ .
  • Embodiment 2-2 may include the case with CS hopping (i.e., both CS hopping and comb offset hopping are configured) , and scheme 1 and scheme 2 as provided in Embodiment 1-1 and scheme 1' and scheme 2' as provided in Embodiment 1-3 may also be applied in such case.
  • the comb offsets for the second SRS port (e.g., SRS port 1001) and the fourth SRS port (e.g., SRS port 1003) may be determined further based on whether the determined CS for the first SRS port (e.g., SRS port 1000) is within wherein is a maximum number of CSs for SRS transmission.
  • a comb offset for an SRS port p i may be represented by which is determined based on the following equation (19) in the case when Alt. 3 is applied:
  • equation (19) is the determined CS for the first SRS port (e.g., SRS port 1000) .
  • SRS port 1000 e.g., SRS port 1000
  • Other parameters in equation (19) may have the same definitions as those in equation (16) .
  • a comb offset for an SRS port p i may be represented by which is determined based on the following equation (20) in the case when Alt. 4 is applied:
  • equation (20) is the determined CS for the first SRS port (e.g., SRS port 1000) .
  • SRS port 1000 e.g., SRS port 1000
  • Other parameters in equation (20) may have the same definitions as those in equation (18) .
  • the subset of comb offsets for SRS transmission with comb offset hopping may be configured via various manners.
  • the subset of comb offsets may be indicated by an indication (e.g., an RRC signaling) .
  • the indication may be a bitmap, wherein each bit may indicate whether a corresponding comb offset of all possible/candidate comb offsets is included in the subset of comb offsets, or may indicate whether a corresponding group of comb offsets of a plurality of groups of comb offsets is included in the subset of comb offsets.
  • comb offset hopping and/or CS hopping may be configured for aperiodic SRS.
  • comb offset hopping and/or CS hopping may happen for R (e.g., R>1) repeated transmissions with or without frequency hopping.
  • R e.g., R>1
  • aperiodic SRS may be triggered for special purpose and the performance has better to be guaranteed according to high transmission priority.
  • the initial CS (i.e. ) and/or comb offset (i.e. ) have better to be controlled by the BS dynamically.
  • the first indication for indicating the initial CS and the initial comb offset may be transmitted by the BS and received by the UE (e.g., in step 202) via DCI or MAC CE.
  • the first indication may be the DCI or the MAC CE, or may be included in the DCI or the MAC CE.
  • the DCI or the MAC CE may include 4 bits for indicating an initial CS when the maximum number of CSs for SRS transmission is 12 (i.e., a CS from 12 possible CSs is indicated as the initial CS) , and may include 3 bits for indicating an initial comb offset when a number of transmission combs for SRS transmission is 8 (i.e., a comb offset from 8 possible comb offsets is indicated as the initial comb offset) .
  • a subset of CSs for initial CS may be configured, which may include only part of the possible CSs; alternatively or additionally, a subset of comb offsets for initial comb offset may be configured, which may include only part of the possible comb offsets.
  • the UE may receive, from the BS, a second indication (e.g., via RRC signaling) indicating the subset of CSs for initial CS. Alternatively or additionally, the second indication may indicate the subset of comb offsets for initial comb offset.
  • the UE may receive (e.g., in step 202) the first indication (e.g., via DCI or MAC CE) which indicates a CS in the subset of CSs as the initial CS, e.g., by indicating an index of the CS in the subset of CSs.
  • the first indication may include 2 bits for indicating the initial CS.
  • the first indication may indicate a comb offset in the subset of comb offsets as the initial comb offset, e.g., by indicating an index of the comb offset in the subset of comb offsets.
  • the first indication may include 2 bits for indicating the initial comb offset.
  • the BS may control the subset of CSs and/or the subset of comb offsets used for aperiodic SRS when a plurality of (restricted) subsets of CSs and/or a plurality of (restricted) subsets of comb offsets are configured for aperiodic SRS.
  • the subset of CSs and/or the subset of comb offsets used for aperiodic SRS may be indicated by DCI or MAC CE.
  • the UE may receive, from the BS, DCI or a MAC CE indicating an index of a subset of CSs in the plurality of subsets of CSs or an index of a subset of comb offsets in the plurality of subsets of comb offsets for aperiodic SRS. Then, the UE may receive (e.g., in step 202) , from the BS, the first indication which indicates a CS in the indicated subset of CSs as the initial CS. Alternatively or additionally, the first indication may indicate a comb offset in the indicated subset of comb offsets as the initial comb offset. For example, the first indication may be received via an RRC signaling, e.g., the higher-layer parameter transmissionComb as specified in 3GPP standard documents.
  • RRC signaling e.g., the higher-layer parameter transmissionComb as specified in 3GPP standard documents.
  • Figure 3 illustrates a flowchart of an exemplary method in accordance with aspects of the present disclosure.
  • the operations of the method illustrated in Figure 3 may be performed by a BS (e.g., NE 102 in Figure 1) as described herein or other apparatus with the like functions.
  • the BS may execute a set of instructions to control functional elements of the BS to perform the described operations or functions.
  • the BS may transmit a first indication for indicating an initial CS and an initial comb offset for SRS transmission.
  • the BS may determine a CS for each SRS port based on the initial CS and determine a comb offset for each SRS port based on the initial comb offset, wherein the CS is determined further based on a CS hop value or the comb offset is determined further based on a comb offset hop value.
  • the BS may receive an SRS transmission based on the determined CS (s) and determined comb offset (s) .
  • All the definitions and operations related to the first indication, initial CS, initial comb offset, CS hop value, and comb offset hop value described with respect to FIG. 2 may also apply here.
  • the operations of the BS for determining a CS for each SRS port and determining a comb offset for each SRS port in step 304 may be the same as those performed by the UE as described with respect to FIG. 2. Thus, details are omitted for simplicity.
  • the first indication may be transmitted via DCI or MAC CE for aperiodic SRS.
  • the BS may transmit a second indication indicating a subset of CSs for initial CS or a subset of comb offsets for initial comb offset, and the first indication may include an index of the initial CS in the subset of CSs or an index of the initial comb offset in the subset of comb offsets.
  • the BS may transmit DCI or a MAC CE indicating an index of a subset of CSs in a plurality of subsets of CSs or an index of a subset of comb offsets in a plurality of subsets of comb offsets for aperiodic SRS, and the first indication may indicate a CS in the subset of CSs as the initial CS or indicate a comb offset in the subset of comb offsets as the initial comb offset.
  • FIG. 4 illustrates an example of a UE 400 in accordance with aspects of the present disclosure.
  • the UE 400 may include at least one processor 402 and at least one memory 404. Additionally, the UE 400 may also include one or more of at least one controller 406 or at least one transceiver 408.
  • the processor 402, the memory 404, the controller 406, or the transceiver 408, 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.
  • the processor 402, the memory 404, the controller 406, or the transceiver 408, 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.
  • DSP digital signal processor
  • ASIC application-specific integrated circuit
  • the processor 402 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, or any combination thereof) .
  • the processor 402 may be configured to operate the memory 404.
  • the memory 404 may be integrated into the processor 402.
  • the processor 402 may be configured to execute computer-readable instructions stored in the memory 404 to cause the UE 400 to perform various functions of the present disclosure.
  • the memory 404 may include volatile or non-volatile memory.
  • the memory 404 may store computer-readable, computer-executable code including instructions when executed by the processor 402 cause the UE 400 to perform various functions described herein.
  • the code may be stored in a non-transitory computer-readable medium such as the memory 404 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.
  • the processor 402 and the memory 404 coupled with the processor 402 may be configured to cause the UE 400 to perform one or more of the functions described herein (e.g., executing, by the processor 402, instructions stored in the memory 404) .
  • the processor 402 may support wireless communication at the UE 400 in accordance with examples as disclosed herein.
  • the UE 400 may be configured to support a means for performing the operations of the methods described in the embodiments of the present disclosure.
  • the processor 402 may be configured to cause the UE 400 to: receive a first indication for indicating an initial CS and an initial comb offset for SRS transmission; determine a CS for each SRS port based on the initial CS and determine a comb offset for each SRS port based on the initial comb offset, wherein the CS is determined further based on a CS hop value or the comb offset is determined further based on a comb offset hop value; and perform an SRS transmission based on the determined CS (s) and determined comb offset (s) .
  • the controller 406 may manage input and output signals for the UE 400.
  • the controller 406 may also manage peripherals not integrated into the UE 400.
  • the controller 406 may utilize an operating system such as or other operating systems.
  • the controller 406 may be implemented as part of the processor 402.
  • the UE 400 may include at least one transceiver 408. In some other implementations, the UE 400 may have more than one transceiver 408.
  • the transceiver 408 may represent a wireless transceiver.
  • the transceiver 408 may include one or more receiver chains 410, one or more transmitter chains 412, or a combination thereof.
  • a receiver chain 410 may be configured to receive signals (e.g., control information, data, packets) over a wireless medium.
  • the receiver chain 410 may include one or more antennas for receive the signal over the air or wireless medium.
  • the receiver chain 410 may include at least one amplifier (e.g., a low-noise amplifier (LNA) ) configured to amplify the received signal.
  • the receiver chain 410 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 410 may include at least one decoder for decoding the demodulated signal to receive the transmitted data.
  • a transmitter chain 412 may be configured to generate and transmit signals (e.g., control information, data, packets) .
  • the transmitter chain 412 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 412 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 412 may also include one or more antennas for transmitting the amplified signal into the air or wireless medium.
  • FIG. 5 illustrates an example of a processor 500 in accordance with aspects of the present disclosure.
  • the processor 500 may be an example of a processor configured to perform various operations in accordance with examples as described herein.
  • the processor 500 may include a controller 502 configured to perform various operations in accordance with examples as described herein.
  • the processor 500 may optionally include at least one memory 504, which may be, for example, a layer 1 (L1) , layer 2 (L2) , or layer 3 (L3) cache. Additionally, or alternatively, the processor 500 may optionally include one or more arithmetic-logic units (ALUs) 506.
  • ALUs arithmetic-logic units
  • 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) .
  • the processor 500 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.
  • a protocol stack e.g., a software stack
  • operations e.g., receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading
  • 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 500) 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) .
  • RAM random access memory
  • ROM read-only memory
  • DRAM dynamic RAM
  • SDRAM synchronous dynamic RAM
  • SRAM static RAM
  • FeRAM ferroelectric RAM
  • MRAM magnetic RAM
  • RRAM resistive RAM
  • PCM phase change memory
  • the controller 502 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 500 to cause the processor 500 to support various operations in accordance with examples as described herein.
  • the controller 502 may operate as a control unit of the processor 500, generating control signals that manage the operation of various components of the processor 500. These control signals include enabling or disabling functional units, selecting data paths, initiating memory access, and coordinating timing of operations.
  • the controller 502 may be configured to fetch (e.g., obtain, retrieve, receive) instructions from the memory 504 and determine subsequent instruction (s) to be executed to cause the processor 500 to support various operations in accordance with examples as described herein.
  • the controller 502 may be configured to track memory address of instructions associated with the memory 504.
  • the controller 502 may be configured to decode instructions to determine the operation to be performed and the operands involved.
  • the controller 502 may be configured to interpret the instruction and determine control signals to be output to other components of the processor 500 to cause the processor 500 to support various operations in accordance with examples as described herein.
  • the controller 502 may be configured to manage flow of data within the processor 500.
  • the controller 502 may be configured to control transfer of data between registers, ALUs, and other functional units of the processor 500.
  • the memory 504 may include one or more caches (e.g., memory local to or included in the processor 500 or other memory, such RAM, ROM, DRAM, SDRAM, SRAM, MRAM, flash memory, etc. ) .
  • the memory 504 may reside within or on a processor chipset (e.g., local to the processor 500) .
  • the memory 504 may reside external to the processor chipset (e.g., remote to the processor 500) .
  • the memory 504 may store computer-readable, computer-executable code including instructions that, when executed by the processor 500, cause the processor 500 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 502 and/or the processor 500 may be configured to execute computer-readable instructions stored in the memory 504 to cause the processor 500 to perform various functions.
  • the processor 500 and/or the controller 502 may be coupled with or to the memory 504, the processor 500, the controller 502, and the memory 504 may be configured to perform various functions described herein.
  • the processor 500 may include multiple processors and the memory 504 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.
  • the one or more ALUs 506 may be configured to support various operations in accordance with examples as described herein.
  • the one or more ALUs 506 may reside within or on a processor chipset (e.g., the processor 500) .
  • the one or more ALUs 506 may reside external to the processor chipset (e.g., the processor 500) .
  • One or more ALUs 506 may perform one or more computations such as addition, subtraction, multiplication, and division on data.
  • one or more ALUs 506 may receive input operands and an operation code, which determines an operation to be executed.
  • One or more ALUs 506 be configured with a variety of logical and arithmetic circuits, including adders, subtractors, shifters, and logic gates, to process and manipulate the data according to the operation. Additionally, or alternatively, the one or more ALUs 506 may support logical operations such as AND, OR, exclusive-OR (XOR) , not-OR (NOR) , and not-AND (NAND) , enabling the one or more ALUs 506 to handle conditional operations, comparisons, and bitwise operations.
  • logical operations such as AND, OR, exclusive-OR (XOR) , not-OR (NOR) , and not-AND (NAND) , enabling the one or more ALUs 506 to handle conditional operations, comparisons, and bitwise operations.
  • the processor 500 may support wireless communication in accordance with examples as disclosed herein.
  • the processor 500 may be configured to or operable to support a means for performing the operations of the methods described in the embodiments of the present disclosure.
  • the controller 502 may cause the processor 500 to: receive a first indication for indicating an initial CS and an initial comb offset for SRS transmission; determine a CS for each SRS port based on the initial CS and determine a comb offset for each SRS port based on the initial comb offset, wherein the CS is determined further based on a CS hop value or the comb offset is determined further based on a comb offset hop value; and perform an SRS transmission based on the determined CS (s) and determined comb offset (s) .
  • FIG. 6 illustrates an example of a BS 600 in accordance with aspects of the present disclosure.
  • the BS 600 may include at least one processor 602 and at least one memory 604. Additionally, the BS 600 may also include one or more of at least one controller 606 or at least one 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.
  • 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.
  • DSP digital signal processor
  • ASIC application-specific integrated circuit
  • 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) .
  • the processor 602 may be configured to operate the memory 604.
  • 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 BS 600 to perform various functions of the present disclosure.
  • 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 BS 600 to perform various functions described herein.
  • the code may be stored in a non-transitory computer-readable medium such as 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.
  • the processor 602 and the memory 604 coupled with the processor 602 may be configured to cause the BS 600 to perform one or more of the functions described herein (e.g., executing, by the processor 602, instructions stored in the memory 604) .
  • the processor 602 may support wireless communication at the BS 600 in accordance with examples as disclosed herein.
  • the BS 600 may be configured to support a means for performing the operations of the methods described in the embodiments of the present disclosure.
  • the processor 602 may be configured to cause the BS 600 to: transmit a first indication for indicating an initial CS and an initial comb offset for SRS transmission; determine a CS for each SRS port based on the initial CS and determine a comb offset for each SRS port based on the initial comb offset, wherein the CS is determined further based on a CS hop value or the comb offset is determined further based on a comb offset hop value; and receive an SRS transmission based on the determined CS (s) and determined comb offset (s) .
  • the controller 606 may manage input and output signals for the BS 600.
  • the controller 606 may also manage peripherals not integrated into the BS 600.
  • the controller 606 may utilize an operating system such as or other operating systems.
  • the controller 606 may be implemented as part of the processor 602.
  • the BS 600 may include at least one transceiver 608. In some other implementations, the BS 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.
  • a receiver chain 610 may be configured to receive signals (e.g., control information, data, packets) over a wireless medium.
  • 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 demodulated signal to receive the transmitted data.
  • 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.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Divers aspects de la présente divulgation concernent des procédés et des appareils de sondage de signal de référence (SRS) avec saut de décalage cyclique (CS) et/ou saut de décalage de peigne. Selon un mode de réalisation de la présente divulgation, un équipement utilisateur (UE) peut comprendre : au moins une mémoire ; et au moins un processeur couplé à la ou aux mémoires et configuré pour amener l'UE à : recevoir une indication pour indiquer un CS initial et un décalage de peigne initial pour une transmission de SRS ; déterminer un CS pour chaque port de SRS sur la base du CS initial et déterminer un décalage de peigne pour chaque port de SRS sur la base du décalage de peigne initial, le CS étant déterminé en outre sur la base d'une valeur de saut de CS ou le décalage de peigne étant déterminé en outre sur la base d'une valeur de saut de décalage de peigne ; et effectuer une transmission de SRS sur la base du ou des CS déterminés et du ou des décalages de peigne déterminés.
PCT/CN2023/107544 2023-07-14 2023-07-14 Procédés et appareils pour srs avec saut de cs et/ou saut de décalage de peigne Pending WO2024087743A1 (fr)

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CN102223726A (zh) * 2011-06-10 2011-10-19 中兴通讯股份有限公司 一种srs的发送方法和系统
US20220029861A1 (en) * 2020-07-27 2022-01-27 Samsung Electronics Co., Ltd. Method and apparatus for enhancing srs flexibility, coverage, and capacity in a communication system
US20230050730A1 (en) * 2020-02-07 2023-02-16 Qualcomm Incorporated Sounding reference signal (srs) enhancements
WO2023050135A1 (fr) * 2021-09-29 2023-04-06 Lenovo (Beijing) Limited Génération de séquence srs
US20230124754A1 (en) * 2020-06-29 2023-04-20 Qualcomm Incorporated Puncturing unit for sounding reference signal (srs) comb patterns with cyclic shifting
WO2023091417A1 (fr) * 2021-11-17 2023-05-25 Intel Corporation Fonctionnement amélioré de signal de référence de sondage (srs) pour systèmes de cinquième génération (5g)

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CN102223726A (zh) * 2011-06-10 2011-10-19 中兴通讯股份有限公司 一种srs的发送方法和系统
US20230050730A1 (en) * 2020-02-07 2023-02-16 Qualcomm Incorporated Sounding reference signal (srs) enhancements
US20230124754A1 (en) * 2020-06-29 2023-04-20 Qualcomm Incorporated Puncturing unit for sounding reference signal (srs) comb patterns with cyclic shifting
US20220029861A1 (en) * 2020-07-27 2022-01-27 Samsung Electronics Co., Ltd. Method and apparatus for enhancing srs flexibility, coverage, and capacity in a communication system
WO2023050135A1 (fr) * 2021-09-29 2023-04-06 Lenovo (Beijing) Limited Génération de séquence srs
WO2023091417A1 (fr) * 2021-11-17 2023-05-25 Intel Corporation Fonctionnement amélioré de signal de référence de sondage (srs) pour systèmes de cinquième génération (5g)

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