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WO2025175022A1 - Procédé de sondage de canal 3tx - Google Patents

Procédé de sondage de canal 3tx

Info

Publication number
WO2025175022A1
WO2025175022A1 PCT/US2025/015816 US2025015816W WO2025175022A1 WO 2025175022 A1 WO2025175022 A1 WO 2025175022A1 US 2025015816 W US2025015816 W US 2025015816W WO 2025175022 A1 WO2025175022 A1 WO 2025175022A1
Authority
WO
WIPO (PCT)
Prior art keywords
srs
wtru
value
ports
port
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/US2025/015816
Other languages
English (en)
Inventor
Loic CANONNE-VELASQUEZ
Afshin Haghighat
Moon Il Lee
Jonghyun Park
Virgil Comsa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
InterDigital Patent Holdings Inc
Original Assignee
InterDigital Patent Holdings Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by InterDigital Patent Holdings Inc filed Critical InterDigital Patent Holdings Inc
Publication of WO2025175022A1 publication Critical patent/WO2025175022A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/30—Transmission power control [TPC] using constraints in the total amount of available transmission power
    • H04W52/36—Transmission power control [TPC] using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/38—TPC being performed in particular situations
    • H04W52/42—TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity

Definitions

  • a wireless transmit/receive unit may perform one or more operations (e.g., channel sounding) for 3 antenna ports with an N>3 antenna port sounding reference signal (SRS) resource.
  • the WTRU may determine a mapping from 3 antenna ports (Aps) to 4 SRS ports.
  • the WTRU may apply a scaling factor to determine the transmission power per SRS port.
  • a wireless transmit/receive unit may receive configuration information comprising one or more sounding reference signal (SRS) resources with four SRS ports per SRS resource.
  • the configuration information comprises tdm port configuration.
  • the WTRU may determine the association between an AP and one or more SRS ports.
  • the WTRU may determine the association between the AP and one or more SRS ports based on a preconfigured mapping.
  • the WTRU may transmit an SRS using three antenna ports (APs).
  • the three antenna ports may be mapped to the four SRS ports in an SRS resource of the one or more SRS resources.
  • the WTRU may determine a transmission power split for each of the one or more SRS ports.
  • the WTRU may transmit a physical uplink shared channel (PUSCH) with a precoder indicated in a grant.
  • PUSCH physical uplink shared channel
  • a WTRU may receive configuration information.
  • the configuration information may indicate a plurality of sounding reference signal (SRS) ports (e.g., for channel sounding).
  • the configuration information may include SRS resource configuration and/or at least one power scaling value.
  • the WTRU may determine a second transmission power for the SRS port based on the (e.g., linear) value.
  • the WTRU may determine a third transmission power for the third SRS port based on the (e.g., linear) value and/or at least one power scaling value.
  • the WTRU may determine a fourth transmission power for the fourth SRS port based on the (e.g., linear) value and/or the at least one power scaling value.
  • the WTRU may transmit an SRS transmission (e.g., over the plurality of SRS ports) in accordance with the respective transmission power per SRS port.
  • the SRS configuration may include fixed mapping, one or more parameters of SRS resource configuration, an AP-SRS port association index value, and/or one or more patterns.
  • the WTRU may determine the association based on one or more of the fixed mapping, the one or more parameters of SRS resource configuration, the AP-SRS port association index value, and/or the one or more patterns.
  • the fixed mapping may include static association information to associate the plurality of APs with the plurality of SRS ports.
  • the association may be determined based on the static association information.
  • the WTRU may receive an indication to activate and/or deactivate one or more patterns that associate the plurality of APs with the plurality of SRS ports.
  • the association may be determined based on one or more activated and/or deactivated patterns.
  • the indication may be received via a medium access control (MAC) control entity (CE).
  • MAC medium access control
  • CE medium access control entity
  • the (e.g., linear) value may include a respective (e.g., linear) value associated with each AP.
  • the WTRU may apply a second scaling value to determine each respective (e.g., linear) value.
  • the plurality of APs may include a first AP group and/or a second AP group. Each respective (e.g., linear) value may be determined based on the first AP group and/or the second AP group.
  • the WTRU may send a report that indicates capability information associated with the plurality of APS.
  • the WTRU may receive the configuration information in response to the capability information.
  • the WTRU may determine the transmission power for the third SRS port based on the at least one power scaling value and/or the (e.g., linear) value.
  • the WTRU may determine a third scaling value based on the at least one power scaling value.
  • the WTRU may determine the transmission power for the fourth SRS port based on the third scaling value.
  • the WTRU being configured to determine the transmission power for the respective first and second SRS port may include the WTRU being configured to divide the (e.g., linear) value by the number of APs of the plurality of APs.
  • a WTRU may receive configuration information.
  • the configuration information may indicate a plurality of SRS ports (e.g., for channel sounding).
  • the configuration information may include SRS resource configuration and at least one power scaling value.
  • the WTRU may determine an association between a plurality of antenna ports and a plurality of SRS ports based on the SRS resource configuration information.
  • the WTRU may determine a transmission power per SES port.
  • the WTRU may determine a (e.g., linear) value based on a total transmission power.
  • the transmission power for each SRS port may be determined based on the (e.g., linear) value and/or the at least one power scaling value.
  • the WTRU may determine transmission power (e.g., over the plurality of SRS ports) in accordance with the respective transmission power per SRS port.
  • FIG.1A is a system diagram illustrating an example communications system in which one or more disclosed embodiments may be implemented.
  • FIG.1B is a system diagram illustrating an example wireless transmit/receive unit (WTRU) that may be used within the communications system illustrated in FIG.1A according to an embodiment.
  • WTRU wireless transmit/receive unit
  • FIG.1C is a system diagram illustrating an example radio access network (RAN) and an example core network (CN) that may be used within the communications system illustrated in FIG.1A according to an embodiment.
  • FIG.1D is a system diagram illustrating a further example RAN and a further example CN that may be used within the communications system illustrated in FIG.1A according to an embodiment.
  • FIG.2a is a diagram illustrating an example of a mapping of 3 WTRU antenna ports to SRS ports with power scaling factor.
  • FIG.2b is a diagram illustrating an example of a mapping of 3 WTRU antenna ports to SRS ports with alpha and/or beta.
  • FIG.3 is a diagram illustrating an example of a special case without power splitting.
  • FIG.1A is a diagram illustrating an example communications system 100 in which one or more disclosed embodiments may be implemented.
  • the communications system 100 may be a multiple access system that provides content, such as voice, data, video, messaging, broadcast, etc., to multiple wireless users.
  • the communications system 100 may enable multiple wireless users to access such content through the sharing of system resources, including wireless bandwidth.
  • the communications systems 100 may employ one or more channel access methods, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), single-carrier FDMA (SC-FDMA), zero-tail unique-word DFT-Spread OFDM (ZT UW DTS-s OFDM), unique word OFDM (UW-OFDM), resource block-filtered OFDM, filter bank multicarrier (FBMC), and the like.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal FDMA
  • SC-FDMA single-carrier FDMA
  • ZT UW DTS-s OFDM zero-tail unique-word DFT-Spread OFDM
  • UW-OFDM unique word OFDM
  • FBMC filter bank multicarrier
  • the communications system 100 may include wireless transmit/receive units (WTRUs) 102a, 102b, 102c, 102d, a RAN 104/113, a CN 106/115, a public switched telephone network (PSTN) 108, the Internet 110, and other networks 112, though it will be appreciated that the disclosed embodiments contemplate any number of WTRUs, base stations, networks, and/or network elements.
  • WTRUs 102a, 102b, 102c, 102d may be any type of device configured to operate and/or communicate in a wireless environment.
  • the WTRUs 102a, 102b, 102c, 102d may be configured to transmit and/or receive wireless signals and may include a user equipment (UE), a mobile station, a fixed or mobile subscriber unit, a subscription-based unit, a pager, a cellular telephone, a personal digital assistant (PDA), a smartphone, a laptop, a netbook, a personal computer, a wireless sensor, a hotspot or Mi-Fi device, an Internet of Things (IoT) device, a watch or other wearable, a head-mounted display (HMD), a vehicle, a drone, a medical device and applications (e.g., remote surgery), an industrial device and applications (e.g., a robot and/or other wireless devices operating in an industrial and/or an automated processing chain contexts), a consumer electronics device, a device operating on commercial and/or industrial wireless networks, and the like.
  • UE user equipment
  • PDA personal digital assistant
  • smartphone a laptop
  • a netbook a personal computer
  • the communications systems 100 may also include a base station 114a and/or a base station 114b.
  • Each of the base stations 114a, 114b may be any type of device configured to wirelessly interface with at least one of the WTRUs 102a, 102b, 102c, 102d to facilitate access to one or more communication networks, such as the CN 106/115, the Internet 110, and/or the other networks 112.
  • the base stations 114a, 114b may be a base transceiver station (BTS), a Node-B, an eNode B, a Home Node B, a Home eNode B, a gNB, a NR NodeB, a site controller, an access point (AP), a wireless router, and the like. While the base stations 114a, 114b are each depicted as a single element, it will be appreciated that the base stations 114a, 114b may include any number of interconnected base stations and/or network elements.
  • the base stations 114a, 114b may communicate with one or more of the WTRUs 102a, 102b, 102c, 102d over an air interface 116, which may be any suitable wireless communication link (e.g., radio frequency (RF), microwave, centimeter wave, micrometer wave, infrared (IR), ultraviolet (UV), visible light, etc.).
  • the air interface 116 may be established using any suitable radio access technology (RAT).
  • RAT radio access technology
  • the communications system 100 may be a multiple access system and may employ one or more channel access schemes, such as CDMA, TDMA, FDMA, OFDMA, SC-FDMA, and the like.
  • the base station 114a in the RAN 104/113 and the WTRUs 102a, 102b, 102c may implement a radio technology such as Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access (UTRA), which may establish the air interface 115/116/117 using wideband CDMA (WCDMA).
  • WCDMA may include communication protocols such as High-Speed Packet Access (HSPA) and/or Evolved HSPA (HSPA+).
  • HSPA may include High-Speed Downlink (DL) Packet Access (HSDPA) and/or High-Speed UL Packet Access (HSUPA).
  • the base station 114a and the WTRUs 102a, 102b, 102c may implement radio technologies such as IEEE 802.11 (i.e., Wireless Fidelity (WiFi), IEEE 802.16 (i.e., Worldwide Interoperability for Microwave Access (WiMAX)), CDMA2000, CDMA20001X, CDMA2000 EV-DO, Interim Standard 2000 (IS-2000), Interim Standard 95 (IS-95), Interim Standard 856 (IS-856), Global System for Mobile communications (GSM), Enhanced Data rates for GSM Evolution (EDGE), GSM EDGE (GERAN), and the like.
  • IEEE 802.11 i.e., Wireless Fidelity (WiFi)
  • IEEE 802.16 i.e., Worldwide Interoperability for Microwave Access (WiMAX)
  • CDMA2000, CDMA20001X, CDMA2000 EV-DO Code Division Multiple Access 2000
  • IS-95 Interim Standard 95
  • IS-856 Interim Standard 856
  • GSM Global System for
  • the RAN 104/113 and/or the CN 106/115 may be in direct or indirect communication with other RANs that employ the same RAT as the RAN 104/113 or a different RAT.
  • the CN 106/115 may also be in communication with another RAN (not shown) employing a GSM, UMTS, CDMA 2000, WiMAX, E-UTRA, or WiFi radio technology.
  • the SGW 164 may be connected to the PGW 166, which may provide the WTRUs 102a, 102b, 102c with access to packet-switched networks, such as the Internet 110, to facilitate communications between the WTRUs 102a, 102b, 102c and IP-enabled devices.
  • the CN 106 may facilitate communications with other networks. For example, the CN 106 may provide the WTRUs 102a, 102b, 102c with access to circuit-switched networks, such as the PSTN 108, to facilitate communications between the WTRUs 102a, 102b, 102c and traditional land-line communications devices.
  • FIG.1D is a system diagram illustrating the RAN 113 and the CN 115 according to an embodiment.
  • the RAN 113 may employ an NR radio technology to communicate with the WTRUs 102a, 102b, 102c over the air interface 116.
  • the CN 115 shown in FIG.1D may include at least one AMF 182a, 182b, at least one UPF 184a,184b, at least one Session Management Function (SMF) 183a, 183b, and possibly a Data Network (DN) 185a, 185b. While each of the foregoing elements are depicted as part of the CN 115, it will be appreciated that any of these elements may be owned and/or operated by an entity other than the CN operator. [0068]
  • the AMF 182a, 182b may be connected to one or more of the gNBs 180a, 180b, 180c in the RAN 113 via an N2 interface and may serve as a control node.
  • the network may require a procedure for sounding the channel over the 3TX reusing existing SRS resources (e.g., 1, 2, 4, 8 port SRS).
  • the network may require a codebook of precoders for 3TX which the receiver may use to determine the optimal precoder based on the sounding procedure.
  • the network may require a method for the network to indicate to the WTRU the determined precoder for the UL codebook- based transmission.
  • the (e.g., current) specification may not support a 3 port SRS resource and/or NR may not have one or more (e.g., any) methods for 3TX channel sounding in codebook-based configuration.
  • Embodiments described herein may address what is the procedure for a WTRU with 3TX to perform one or more operations (e.g., channel sounding).
  • SRS can be used for (e.g., direct) channel sounding, beam management, and/or antenna switching; the association may be applicable in one or more (e.g., all) operations.
  • Embodiments described herein may be applied for one or more (e.g., any) combinations of (e.g., odd number of) APs to associate with and/or map to (e.g., even number of) SRS ports.
  • Embodiments described herein may relate to a method for 3TX channel sounding with N>3 ports SRS resource.
  • embodiments may relate to a WTRU configured to determining the 3TX SRS resource and/or power allocation (e.g., for channel sounding).
  • a WTRU may receive configuration information.
  • the configuration information may indicate a plurality of SRS ports (e.g., for channel sounding).
  • the configuration information may include SRS resource configuration and at least one power scaling value.
  • the WTRU may determine an association between a plurality of antenna ports and a plurality of SRS ports based on the SRS resource configuration information.
  • the WTRU may determine a transmission power per SRS port.
  • the WTRU may determine a (e.g., linear) value based on a total transmission power.
  • a (e.g., linear) value may indicate that the units are in Watts (e.g., as opposed to dBm).
  • the transmission power for each SRS port may be determined based on the (e.g., linear) value and/or the at least one power scaling value.
  • the WTRU may transmit an SRS transmission (e.g., over the plurality of SRS ports) in accordance with the respective transmission power per SRS port.
  • the SRS transmission may be a single SRS transmission (e.g., the four SRS ports may correspond to a single SRS resource).
  • the WTRU may determine an association between a plurality of antenna ports (APs) and the plurality of SRS ports, for example, based on the SRS resource configuration information.
  • a first AP of the plurality of APs may be mapped to a first SRS port of the plurality of SRS ports.
  • a second AP of the plurality of APs may be mapped to a second SRS port of the plurality of SRS ports.
  • a third AP of the plurality of APs may be mapped to a third SRS port and to a fourth SRS port of the plurality of SRS ports.
  • the WTRU may map each of a first and a second AP to a respective first and second SRS port, and/or may map a third AP to the two remaining SRS ports (e.g., to both a third SRS port and a fourth SRS port).
  • Each AP may be associated with an index.
  • the WTRU transmits one or more (e.g., multiple) SRS resources (e.g., periodic SRS case)
  • the WTRU may cycle the index of the AP that maps to two SRS ports.
  • the SRS resource configuration may indicate a pattern for the order of the mapped antenna port index.
  • the triggering command may indicate the index of the AP mapped to two SRS ports.
  • the SRS configuration information may include fixed mapping, one or more parameters of SRS resource configuration, an AP-SRS port association index value, and/or one or more patterns.
  • the WTRU may determine the association based on one or more of the fixed mapping, the one or more parameters of SRS resource configuration, the AP-SRS port association index value, and/or the one or more patterns.
  • the fixed mapping may include static association information to associate the plurality of APs with the plurality of SRS ports. The association may be determined based on the static association information.
  • the WTRU may receive a value of ⁇ as part of the SRS resource set configuration for scaling.
  • the WTRU may calculate a (e.g., linear) value of the transmit power (Plin) according to the SRS power control formula.
  • the WTRU may split Plin across the number of APs (for the example of 3 APs, the WTRU may calculate Plin/3).
  • the WTRU may transmit on the 1 st and 2 nd SRS port according to the split (e.g., linear) value per AP (for the example of 3 APs, the power for each of these SRS ports is Plin/3).
  • the WTRU may transmit on the 3 rd and 4 th SRS port according to a scaling of the split (e.g., linear) value per AP, where the WTRU may scale it by ⁇ onto the third SRS port, and by (1- ⁇ ) onto the fourth SRS port (for the example of 3APs, the power of the 3 rd SRS port is ⁇ *Plin/3 and the power of the 4 th SRS port is (1- ⁇ )*Plin/3).
  • the (e.g., linear) value may include a respective (e.g., linear) value associated with each AP.
  • the WTRU may apply a second scaling value to determine each respective (e.g., linear) value.
  • a WTRU may transmit and/or receive a physical channel and/or reference signal according to at least one spatial domain filter.
  • the term beam may be used herein to refer to a spatial domain filter.
  • the WTRU may transmit a physical channel and/or signal using the same spatial domain filter as the spatial domain filter used for receiving a reference signal (RS) (such as a channel state information RS (CSI-RS)) and/or a synchronization signal (SS) block.
  • RS reference signal
  • CSI-RS channel state information RS
  • SS synchronization signal
  • a spatial relation may be implicit, configured by radio resource control (RRC) and/or signaled by medium access control control element (MAC CE) and/or downlink control information (DCI).
  • RRC radio resource control
  • MAC CE medium access control control element
  • DCI downlink control information
  • a WTRU may (e.g., implicitly) transmit physical uplink shared channel (PUSCH) and demodulated RS (DM- RS) of PUSCH according to the same spatial domain filter as an SRS indicated by an SRS resource indicator (SRI) indicated in DCI and/or configured by RRC.
  • a spatial relation may be configured by RRC for an SRI and/or signaled by MAC CE for a physical uplink control channel (PUCCH).
  • PUCCH physical uplink control channel
  • Such spatial relation may (e.g., also) be referred to as a beam indication.
  • the WTRU may receive a first (e.g., target) downlink channel and/or signal according to the same spatial domain filter or spatial reception parameter as a second (e.g., reference) downlink channel and/or signal.
  • a first (e.g., target) downlink channel and/or signal may be received according to the same spatial domain filter or spatial reception parameter as a second (e.g., reference) downlink channel and/or signal.
  • a first and second signals are reference signals
  • association may exist when the WTRU is configured with a quasi-colocation (QCL) assumption type D between corresponding antenna ports.
  • QCL quasi-colocation
  • Such association may be configured as a transmission configuration indicator (TCI) state.
  • TCI transmission configuration indicator
  • a WTRU may be indicated an association between a CSI-RS and/or SS block and a DM-RS by an index to a set of TCI states configured by RRC and/or signaled by MAC CE. Such indication may (e.g., also) be referred to as a beam indication.
  • a transmission and reception point may be interchangeably used herein with one or more of transmission point (TP), reception point (RP), radio remote head (RRH), distributed antenna (DA), base station (BS), a sector (e.g., of a BS), and/or a cell (e.g., a geographical cell area served by a BS).
  • Multi-TRP may be interchangeably used with one or more of MTRP, M-TRP, and/or multiple TRPs.
  • a UE may be configured with (and/or may receive configuration of) one or more TRPs to which the WTRU may transmit and/or from which the WTRU may receive.
  • the WTRU may be configured with one or more TRPs for one or more cells.
  • a cell may be a serving cell, secondary cell.
  • a WTRU may be configured with at least one RS for the purpose of channel measurement.
  • This RS may be denoted as a Channel Measurement Resource (CMR) and/or may include a CSI-RS, SSB, and/or other downlink RS transmitted from the TRP to a WTRU.
  • CMR Channel Measurement Resource
  • a CMR may be configured and/or associated with a TCI state.
  • a WTRU may be configured with a CMR group where CMRs transmitted from the same TRP may be configured. Each group may be identified by a CMR group index (e.g., group 1).
  • a WTRU may be configured with one CMR group per TRP, and/or the WTRU may receive a linkage between one CMR group index and another CMR group index, and/or between one RS index from one CMR group and another RS index from another group.
  • a WTRU may be configured with (and/or receive configuration of) one or more pathloss (PL) reference groups (e.g., sets) and/or one or more SRS groups, SRS resource indicator (SRI) and/or SRS resource sets.
  • PL pathloss
  • a PL reference group may correspond to and/or may be associated with a TRP.
  • a PL reference group may include, identify, correspond to, and/or be associated with one or more TCI states, SRIs, reference signal sets (e.g. CSI-RS set, SRI sets), CORESET index, and/or reference signals (e.g. CSI-RS, SSB).
  • a WTRU may receive a configuration (e.g., any configuration described herein).
  • the configuration may be received from a gNB and/or TRP.
  • the WTRU may receive configuration of one or more TRPs, one or more PL reference groups and/or one or more SRI sets.
  • a WTRU may (e.g., implicitly) determine an association between a RS set/group and a TRP. For example, if the WTRU is configured with two SRS resource sets, the WTRU may determine to transmit to TRP1 with SRS in the first resource set, and/or to TRP2 with SRS in the second resource set.
  • the configuration may be via RRC signaling. [0101]
  • TRP, PL reference group, SRI group, and SRI set may be used interchangeably.
  • a property of a grant and/or assignment may include one or more of the following.
  • a property of a grant and/or assignment may include a frequency allocation.
  • a property of a grant and/or assignment may include an aspect of time allocation, such as a duration.
  • a property of a grant and/or assignment may include a priority.
  • a property of a grant and/or assignment may include a modulation and coding scheme.
  • a property of a grant and/or assignment may include a transport block size.
  • a property of a grant and/or assignment may include one or more (e.g., a number of) spatial layers.
  • a property of a grant and/or assignment may include one or more (e.g., a number of) transport blocks.
  • a property of a grant and/or assignment may include a TCI state, CRI, and/or SRI.
  • a property of a grant and/or assignment may include one or more (e.g., a number of) repetitions.
  • a property of a grant and/or assignment may include whether the repetition scheme is Type A or Type B.
  • a property of a grant and/or assignment may include whether the grant is a configured grant type 1, type 2 or a dynamic grant.
  • a property of a grant and/or assignment may include whether the assignment is a dynamic assignment or a semi-persistent scheduling (configured) assignment.
  • a property of a grant and/or assignment may include a configured grant index and/or a semi-persistent assignment index.
  • a property of a grant and/or assignment may include a periodicity of a configured grant and/or assignment.
  • a property of a grant and/or assignment may include a channel access priority class (CAPC).
  • a property of a grant and/or assignment may include one or more (e.g., any) parameters provided in a DCI, by MAC or by RRC for the scheduling the grant and/or assignment.
  • An indication by DCI may include one or more of the following.
  • An indication by DCI may include an explicit indication by a DCI field and/or by radio network temporary identifier (RNTI) used to mask cyclical redundancy check (CRC) of the PDCCH.
  • RNTI radio network temporary identifier
  • RS may be used interchangeably with one or more of RS resource, RS resource set, RS port, and/or RS port group.
  • RS may be used interchangeably with one or more of SSB, CSI-RS, SRS, and/or DM-RS.
  • time instance may be used interchangeably with slot, symbol, and/or subframe.
  • antenna port may be used to represent a transmission antenna used for UL transmission of a signal at the WTRU.
  • the WTRU may use antenna ports to transmit reference signals (e.g., SRS and/or DMRS), and/or for transmitting physical channels (e.g., PUCCH, PUSCH).
  • the WTRU may be equipped with one or more (e.g., multiple) antenna elements.
  • An antenna port may represent one or more (e.g., multiple) antenna elements.
  • An SRS port may be specified in NR, and/or may map to a physical time/frequency resource.
  • the WTRU may be configured with a number of SRS ports equal to the number of antenna ports reported by the WTRU in its capability.
  • the SRS port may be used by the WTRU to transmit pilot sequences (e.g., reference signals) to a cell on preconfigured time/frequency resources.
  • the WTRU may determine which out of N SRS port indices may be used to transmit the signal from the WTRU antenna ports (APs) where N is greater than the number of APs. For example, the case of N>3 may be considered, where 3 is the number of antenna ports at the WTRU; it may be generalized for a number of APs other than 3. For example, term X (e.g., as described herein) may be the number of APs at the WTRU.
  • the WTRU may receive configuration information that indicates a plurality of sounding reference signal (SRS) ports (e.g., for channel sounding).
  • the configuration information may include SRS resource configuration information and/or at least one power scaling value.
  • the WTRU may determine the association between an AP and one or more SRS ports.
  • the WTRU may determine an association between a plurality of antenna ports (APs) and the plurality of SRS ports, for example, based on the SRS resource configuration information.
  • a first AP of the plurality of APs may be mapped to a first SRS port of the plurality of SRS ports.
  • a second AP of the plurality of APs may be mapped to a second SRS port of the plurality of SRS ports.
  • a third AP of the plurality of APs may be mapped to a third SRS port and to a fourth SRS port of the plurality of SRS ports.
  • the WTRU may transmit over the 4 SRS ports.
  • the WTRU may determine a mapping from the 3 APs to the 4 SRS ports to determine the routing of the signal output from the APs to the ports of the SRS resource.
  • the WTRU may map the first and/or second AP to a respective first and/or second SRS port, and/or may map the third AP to the remaining third and/or fourth respective SRS ports.
  • the WTRU may receive, as part of the SRS resource set configuration, a mapping that identifies the indices of the associated AP and SRS port.
  • the WTRU may change the index of the AP that is mapped to the 2 SRS ports according to a predefined rule/mapping/pattern to cycle the index.
  • the SRS resource configuration may include a pattern which indicates the order of the AP index mapping to the SRS ports for every symbol/slot. For example, the pattern may indicate that the order is ⁇ (s1, AP1, SRS1 and SRS2), (s2, AP2, SRS1 and SRS2) ⁇ .
  • the WTRU may determine the mapping of the remaining 2 APs as one-to-one over the remaining SRS ports after the first AP is mapped.
  • the SRS configuration information may include fixed mapping, one or more parameters of SRS resource configuration, an AP-SRS port association index value, and/or one or more patterns.
  • the WTRU may determine the association based on one or more of the fixed mapping, the one or more parameters of SRS resource configuration, the AP-SRS port association index value, and/or the one or more patterns.
  • the fixed mapping may include static association information to associate the plurality of APs with the plurality of SRS ports. The association may be determined based on the static association information.
  • the pattern may be (e.g., explicitly) configured as part of the SRS resource configuration.
  • the mapping may be configured for the SRS resource set, and/or the WTRU may apply the same mapping to one or more (e.g., all) SRS resources in the resource set. Additionally or alternatively, the mapping may be configured per SRS resource in the set, and/or the WTRU may apply one or more different mappings as a function of the SRS resource index.
  • more than one pattern may be configured, and/or the WTRU may determine the mapping based on one or more parameters of the SRS resource configuration. The WTRU may determine the pattern as a function of one or more of the following.
  • the WTRU may determine the pattern as a function of transmission comb or comb index.
  • the N ports may be transmitted over two different comb indices, and each comb index may be associated with one of the patterns.
  • the WTRU may determine the pattern as a function of sequence number, sequence group index, cyclic shift index.
  • each sequence number/sequence group index may be associated with a different pattern.
  • the first AP may be configured with a cyclic shift, and the cyclic shift is associated to one of the pattern applied over the 3 APs.
  • the WTRU may determine the pattern as a function of the hop index if frequency hopping is configured.
  • the WTRU may transmit on a different mapping pattern.
  • the WTRU may determine the pattern as a function of the repetition index if repetition is configured. For example, for each transmission in a different repetition index of the same SRS resource, the WTRU may transmit on a different mapping pattern.
  • the WTRU may determine the pattern as a function of the SRS port groups if the SRS ports are transmitted in TDM.
  • an SRS resource may be configured with a TDM pattern where SRS ports 1 and 2 are in a first group transmitted in slot 1, and SRS ports 3 and 4 are in a second group transmitted in slot 2.
  • the WTRU may apply a pattern associated to one of the port groups.
  • one AP may be mapped to the two SRS ports in a first port group, and/or in a second port group.
  • the WTRU may determine the pattern as a function of CellID, TRP ID, coresetPoolIndex. For example, the WTRU may apply a different pattern depending on the target receiving point. The WTRU may switch to a different pattern when it transmits to a receiving point with a different CellID, TRP ID, coresetPoolIndex. [0114] Additionally or alternatively, the WTRU may receive a preconfigured mapping with a fixed index of the AP mapped to two SRS ports.
  • the WTRU may be configured with the index of AP1 and AP2 mapped to SRS ports 1 and 2, and AP3 may be mapped to SRS port index 3 and 4.
  • the WTRU may use the same mapping for one or more (e.g., all) transmissions of the same SRS resource.
  • the WTRU may transmit the SRS resource (e.g., always) with the same mapping for one or more (e.g., all) configured time slots.
  • more than one pattern may be configured, and/or the WTRU may determine the mapping based on receiving a dynamic command to activate and/or deactivate a pattern.
  • the index of the aperiodic SRS resource may be associated with one fixed mapping, and/or with one of the time offset that may be indicated for the triggered SRS resource.
  • Different aperiodic SRS resources may be configured with different mappings, and/or the network may trigger different mappings by sending a different aperiodic SRS resource index in the triggering command.
  • SRS resource 1 may be associated to a first mapping
  • SRS resource 2 may be associated to a second mapping.
  • the SRS resource 1 may be triggered if the network requests mapping 1
  • SRS resource 2 may be triggered if the network requests mapping 2.
  • the procedure in NR may be as follows.
  • the WTRU being configured to determine the transmission power for the first and second SRS port may include the WTRU being configured to divide the (e.g., linear) value by the number of APs of the plurality of APs.
  • the WTRU may transmit the SRS ports in different tdm’d groups of SRS ports (e.g., group 1 with SRS ports 1-4 in symbol 1, and group 2 with SRS ports 5-8 in symbol 2), and/or the WTRU may split ⁇ SRS, ⁇ , ⁇ , ⁇ , ⁇ , ⁇ equally across the SRS ports per symbol.
  • the WTRU may transmit on each of the ports in group 1 with ⁇ SRS, ⁇ , ⁇ , ⁇ , ⁇ /4, and/or each of the ports in group 2 with ⁇ SRS, ⁇ , ⁇ , ⁇ , ⁇ /4.
  • the WTRU may (e.g., also) determine the mapping of APs to SRS ports using one of the methods described herein, where the 1 st and 2 nd APs are mapped to a respective 1 st and 2 nd SRS port, and the 3 rd AP is mapped to the 3 rd and 4 th SRS port.
  • the WTRU may follow may perform one or more of the following.
  • the WTRU may calculate the transmission power in dBm using the power control formula and/or may obtain ⁇ SRS, ⁇ , ⁇ , ⁇ , ⁇ .
  • the WTRU may calculate the (e.g., linear) value ⁇ SRS, ⁇ , ⁇ , ⁇ , ⁇ .
  • the WTRU may split the transmitted power equally across the X APs, ⁇ SRS, ⁇ , ⁇ , ⁇ , ⁇ /X.
  • the WTRU may transmit on the 1st and 2nd SRS ports with a transmission power per SRS port according to the (e.g., linear) value split across APs. This may yield a transmission power of ⁇ SRS, ⁇ , ⁇ , ⁇ , ⁇ , ⁇ /X for each of the 1st and 2nd SRS ports.
  • FIG.2a is a diagram illustrating an example of a mapping of 3 WTRU antenna ports to SRS ports with power scaling factor 200.
  • the WTRU may perform the SRS power control procedure (e.g., at 202a) which produces the (e.g., linear) value, ⁇ ⁇ ⁇ SRS, ⁇ , ⁇ , ⁇ , ⁇ , ⁇ .
  • AP1210a may map to 1 st SRS port 216a.
  • AP2212a may map to 2nd SRS port 218a.
  • AP3214a may map to 3 rd SRS port 220a and 4 th SRS port 222a.
  • the value ⁇ may enable the WTRU to split the transmission power for AP3 that maps to two SRS ports.
  • the WTRU may determine, via a SRS power control, Plin per AP.
  • the WTRU may determine Plin of 1/3 for AP1210a.
  • the WTRU may determine Plin of 1/3 for AP2212.
  • the WTRU may determine Plin of 1/3 for AP3214a.
  • the Plin determined for AP1210a, AP2212a, and/or AP3214a may differ (e.g., as described herein).
  • the WTRU may not split Plin equally across one or more (e.g., all) APs.
  • Another scaling factor, ⁇ may be configured such that the WTRU may split Plin according to ⁇ ⁇ Plin per AP.
  • the power splitting procedure after the SRS power control procedure may be instead replaced by the following:
  • the WTRU may determine for the transmission power on the SRS ports corresponding to AP1 scaled by ⁇ ⁇ Plin, to AP2 scaled by ⁇ ⁇ Plin, and to AP3 scaled by ⁇ ⁇ Plin. For example, the determine the transmission power for the third SRS port based on the at least one power scaling value and/or the (e.g., linear) value.
  • the WTRU may determine a third scaling value based on the at least one power scaling value.
  • the WTRU may determine the transmission power for the fourth SRS port based on the third scaling value.
  • the WTRU may determine Plin value based on ⁇ 2.
  • the WTRU e.g., via SRS power control 202b
  • the WTRU e.g., via SRS power control 202b
  • the WTRU e.g., via SRS power control 202
  • ⁇ values may be configured per AP group.
  • AP1 and AP2 may be configured in the same group based on WTRU capability (e.g., APs on the same panel, same polarization, etc).
  • the plurality of APs may include a first AP group and/or a second AP group. Each respective (e.g., linear) value may be determined based on the first AP group and/or the second AP group.
  • Embodiments described herein may be associated with a (e.g., special) case with tdm port configuration.
  • One or more procedures described herein may include the case where the SRS resource is configured with N ports without the tdm transmission.
  • the SRS ports in the port group may be (e.g., both) transmitted in slot 1, and/or transmitted in different slots.
  • Embodiments described herein may be associated with a (e.g., special case) without power splitting ( ⁇ ⁇ 1 or ⁇ ⁇ 0 ⁇ . If ⁇ ⁇ 1 or ⁇ ⁇ 0, the WTRU may perform the procedure of power splitting by X number of APs, ⁇ SRS, ⁇ , ⁇ , ⁇ , ⁇ /X, and/or in the next procedure the WTRU may not allocate (e.g., any) power to one of the N SRS ports.
  • FIG.3 illustrates this case for two different mapping patterns in such a scenario.
  • FIG.3 is a diagram illustrating an example of a special case without power splitting.
  • FIG.3 depicts an example of turning off an antenna port with two different mapping patterns.
  • An antenna port may be turned off to direct the signal towards the best antenna port(s). For example, if channel quality is poor on one antenna port due to blockage and/or orientation, the mapping pattern may change.
  • One option may be to preconfigure the patterns.
  • one or more (e.g., multiple) patterns may be cycled.
  • the WTRU may cycle through different patterns as a function of a hopping sequence (e.g., as a function of time index where a first slot may use mapping pattern 325, and/or a second slot may use mapping pattern 350).
  • a WTRU may be configured with one or more mapping patters to associate a plurality of APs with a plurality of SRS ports.
  • a WTRU may be configured with a first mapping pattern 325 and/or a second mapping pattern 350.
  • AP1302a may be mapped to first SRS port 308a;
  • AP2304a may be mapped to 2 nd SRS port 310a;
  • AP3306a may be mapped to the 3 rd SRS port 312a and 4 th SRS port 314a.
  • the WTRU may allocate at least a portion (e.g., all) of AP3’s 306a power to the 3 rd SRS port 312a.
  • AP1302b may be mapped to the 1 st SRS port 308b and 2 nd SRS port 310b; AP2304b may be mapped to 3 rd SRS port 312b; and/or AP3 may be mapped to 4 th SRS port 314b.
  • the WTRU may allocate at least a portion (e.g., all) of AP1’s 302b power to the 2 nd SRS port 310b.
  • these may be two exemplary mapping patterns that can be configured (e.g.,. explicitly); and/or the WTRU may cycle through different patterns according to one or more rules (e.g., as described herein).
  • Examples described herein may consider the case where two of the APs are mapped one-to-one to SRS ports, and a third AP is mapped to 2 SRS ports. Equivalently, for the case without power splitting (e.g., if ⁇ is not configured), the WTRU may receive a configuration with mapping patterns that associates the X APs with a one-to-one mapping to a subset of the N antenna ports which yields mapping patterns such as shown in Figure 3. [0130] Embodiments described herein may be associated with a (e.g., special) case with SRS ports aggregated from one or more (e.g., multiple) SRS resource sets.
  • the WTRU may receive an SRS resource set configuration with one or more SRS resources, where each SRS resource has N ports.
  • the WTRU may receive a configuration where the N SRS ports are distributed across one or more (e.g., multiple) SRS resources such that the N SRS ports are equal to X AP.
  • the APs of the WTRUs may be mapped one-to-one to the N SRS ports, and/or the WTRU may determine to apply one of the mapping patterns/rules (e.g., described herein) across the N SRS ports from the different SRS resources.
  • the WTRU may transmit over one or more (e.g., multiple) SRS resources where the number of SRS ports aggregated over one or more (e.g., all) resources is equal to N.
  • the WTRU may transmit an SRS with 1 port, and an SRS with 2 ports.
  • AP1 of the WTRU may be mapped to the SRS resource with 1 port, and AP2 and AP3 may be mapped to the first and second port of the SRS resource with 2 ports.
  • the WTRU may be configured with one or more (e.g., multiple) SRS resource sets, where the resources within each SRS resource set are configured with the same number of SRS ports.
  • the first resource set may include 1-port SRS resources, and/or the second resource set may include 2-port SRS resources.
  • the WTRU may transmit the resources from each set according to the configured periodicity.
  • the SRS resources may be triggered individually from each set with a dynamic triggering command received in a grant.
  • the WTRU may (e.g., also) receive in the configuration one SRI per resource set, where the SRI is a bit that indicates one of the SRS resources in the set.
  • the grant may include one SRI per SRS resource set, which may indicate to the WTRU the index of the two SRS resources from the two SRS resource sets that aggregate to a 3 port SRS.
  • the WTRU may transmit the PUSCH over the WTRU’s 3 APs with the same UL spatial filter that is indicated by the two SRIs.
  • the first SRI may indicate the spatial filter for the first AP
  • the second SRI may indicate the spatial filter for the 2 nd and 3 rd AP.
  • the WTRU may be configured with one SRS resource set, where the resources within the SRS resource sets are configured with different number of SRS ports. For example, one or more SRS resources in the set are 1-port SRS, and one or more resources in the set are 2-port SRS. If the set is configured with periodic SRS resources, the WTRU may transmit the resources from the set according to the configured periodicity. If the set is configured with aperiodic SRS, the WTRU may receive a triggering command that may be linked to one, and/or to a pair of SRS resources from the set. The WTRU may transmit the one or more SRS resources associated to the triggering command.
  • the WTRU may receive a configuration of the pair of SRS resources as a function of the WTRU reported capability of X APs.
  • the total number of ports N across the pair of resources may aggregate to X APs.
  • the WTRU may receive a command to trigger a transmission of a 1-port SRS resource and a 2-port SRS resource.
  • the WTRU may determine a fixed association of the APs to SRS ports that is associated to the triggering command (e.g., AP1 to the 1-port SRS resource, and AP2 and AP3 to the 2-port SRS resource).

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

Abstract

Une WTRU peut recevoir des informations de configuration indiquant une pluralité de ports SRS et comprenant une configuration de ressource SRS et/ou au moins une valeur d'échelonnement de la puissance. La WTRU peut déterminer une association entre une pluralité d'AP et la pluralité de ports SRS sur la base de la configuration de ressources SRS : Un premier AP peut effectuer un mappage sur un premier port SRS. Un deuxième AP peut effectuer un mappage sur un deuxième port SRS. Un troisième AP peut effectuer un mappage sur un troisième et un quatrième port SRS. La WTRU peut déterminer une première et une deuxième puissance de transmission pour le premier port SRS sur la base d'une valeur (p. ex., linéaire). La WTRU peut également déterminer une troisième et une quatrième puissance de transmission pour le troisième port SRS sur la base de la valeur (p. ex., linéaire) et/ou d'au moins une valeur d'échelonnement de la puissance. La WTRU peut en outre transmettre une transmission de SRS sur les ports SRS conformément à la puissance de transmission respective par port SRS.
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Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
ERICSSON: "On MIMO evolution", vol. TSG RAN, no. Edinburgh, Scotland; 20231211 - 20231215, 10 December 2023 (2023-12-10), XP052573045, Retrieved from the Internet <URL:https://ftp.3gpp.org/Meetings_3GPP_SYNC/RAN/Docs/RP-232748.zip RP-232748 On MIMO evolution.docx> [retrieved on 20231210] *
OPPO: "Discussion on MIMO enhancement for Rel-19", vol. RAN WG1, no. Bangalore, India; 20230911 - 20230915, 4 September 2023 (2023-09-04), XP052515100, Retrieved from the Internet <URL:https://ftp.3gpp.org/tsg_ran/TSG_RAN/TSGR_101/Docs/RP-231772.zip RP-231772.docx> [retrieved on 20230904] *
SAMSUNG (MODERATOR): "Moderator's summary on new WI NR MIMO Phase 5", vol. TSG RAN, no. Edinburgh, Scotland; 20231211 - 20231215, 6 December 2023 (2023-12-06), XP052571993, Retrieved from the Internet <URL:https://ftp.3gpp.org/tsg_ran/TSG_RAN/TSGR_102/Docs/RP-233089.zip RP-233089 Moderator Summary Rel-19 NR MIMO.docx> [retrieved on 20231206] *

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