WO2024074040A1 - Procédés et appareil d'indication de ressource de srs pour pusch non basé sur un livre de codes - Google Patents

Procédés et appareil d'indication de ressource de srs pour pusch non basé sur un livre de codes Download PDF

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Publication number
WO2024074040A1
WO2024074040A1 PCT/CN2023/094162 CN2023094162W WO2024074040A1 WO 2024074040 A1 WO2024074040 A1 WO 2024074040A1 CN 2023094162 W CN2023094162 W CN 2023094162W WO 2024074040 A1 WO2024074040 A1 WO 2024074040A1
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WIPO (PCT)
Prior art keywords
srs
sri
resources
srs resources
ptrs
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PCT/CN2023/094162
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English (en)
Inventor
Chenxi Zhu
Bingchao LIU
Wei Ling
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Lenovo (Beijing) Ltd.
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Priority to PCT/CN2023/094162 priority Critical patent/WO2024074040A1/fr
Publication of WO2024074040A1 publication Critical patent/WO2024074040A1/fr

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Classifications

    • 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
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • 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
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated

Definitions

  • the subject matter disclosed herein relates generally to wireless communication and more particularly relates to, but not limited to, methods and apparatus of Sounding Reference Signal (SRS) resource indication for non-codebook based Physical Uplink Shared Channel (PUSCH) .
  • SRS Sounding Reference Signal
  • 5G Fifth Generation Partnership Project
  • 5G New Radio
  • 5G Node B gNB
  • LTE Long Term Evolution
  • LTE-A LTE Advanced
  • E-UTRAN Node B eNB
  • Universal Mobile Telecommunications System UMTS
  • WiMAX Evolved UMTS Terrestrial Radio Access Network
  • E-UTRAN Wireless Local Area Networking
  • WLAN Wireless Local Area Networking
  • OFDM Orthogonal Frequency Division Multiplexing
  • SC-FDMA Orthogonal Frequency Division Multiplexing
  • SC-FDMA Orthogonal Frequency Division Multiplexing
  • SC-FDMA Orthogonal Frequency Division Multiplexing
  • SC-FDMA Orthogonal Frequency Division Multiplexing
  • SC-FDMA Orthogonal Frequency Division Multiplexing
  • SC-FDMA Orthogonal Frequency Division Multiplexing
  • SC-FDMA Single-Carrier Frequency-Division Multiple Access
  • DL Downlink
  • UL Uplink
  • UE User Equipment
  • NE Network Equipment
  • a wireless mobile network may provide a seamless wireless communication service to a wireless communication terminal having mobility, i.e., user equipment (UE) .
  • the wireless mobile network may be formed of a plurality of base stations and a base station may perform wireless communication with the UEs.
  • the 5G New Radio is the latest in the series of 3GPP standards which supports very high data rate with lower latency compared to its predecessor LTE (4G) technology.
  • Two types of frequency range (FR) are defined in 3GPP. Frequency of sub-6 GHz range (from 450 to 6000 MHz) is called FR1 and millimeter wave range (from 24.25 GHz to 52.6 GHz) is called FR2.
  • FR1 Frequency of sub-6 GHz range (from 450 to 6000 MHz)
  • millimeter wave range from 24.25 GHz to 52.6 GHz
  • the 5G NR supports both FR1 and FR2 frequency bands.
  • an apparatus including: a transmitter that transmits Downlink Control Information (DCI) for scheduling a non-codebook based Physical Uplink Shared Channel (PUSCH) transmission; and a receiver that receives the non-codebook based PUSCH transmission from a remote device that includes eight antenna ports.
  • DCI Downlink Control Information
  • PUSCH Physical Uplink Shared Channel
  • an apparatus including: a receiver that receives Downlink Control Information (DCI) for scheduling a non-codebook based Physical Uplink Shared Channel (PUSCH) transmission; a processor that determines resources for the non-codebook based PUSCH transmission based on the DCI; and a transmitter that transmits the non-codebook based PUSCH transmission, wherein the transmitter includes eight antenna ports.
  • DCI Downlink Control Information
  • PUSCH Physical Uplink Shared Channel
  • a method including: transmitting, by a transmitter, Downlink Control Information (DCI) for scheduling a non-codebook based Physical Uplink Shared Channel (PUSCH) transmission; and receiving, by a receiver, the non-codebook based PUSCH transmission from a remote device that includes eight antenna ports.
  • DCI Downlink Control Information
  • PUSCH Physical Uplink Shared Channel
  • a method including: receiving, by a receiver, Downlink Control Information (DCI) for scheduling a non-codebook based Physical Uplink Shared Channel (PUSCH) transmission; determining, by a processor, resources for the non-codebook based PUSCH transmission based on the DCI; and transmitting, by a transmitter, the non-codebook based PUSCH transmission, wherein the transmitter includes eight antenna ports.
  • DCI Downlink Control Information
  • PUSCH Physical Uplink Shared Channel
  • Figure 1 is a schematic diagram illustrating a wireless communication system in accordance with some implementations of the present disclosure
  • FIG. 2 is a schematic block diagram illustrating components of user equipment (UE) in accordance with some implementations of the present disclosure
  • FIG. 3 is a schematic block diagram illustrating components of network equipment (NE) in accordance with some implementations of the present disclosure
  • Figure 4 is a flow chart illustrating steps of SRS resource indication for non-codebook based PUSCH by gNB in accordance with some implementations of the present disclosure
  • Figure 5 is a flow chart illustrating steps of SRS resource indication for non-codebook based PUSCH by UE in accordance with some implementations of the present disclosure.
  • Figure 6 is a flow chart illustrating steps of PTRS-DMRS association by gNB in accordance with some implementations of the present disclosure.
  • embodiments may be embodied as a system, an apparatus, a method, or a program product. Accordingly, embodiments may take the form of an all-hardware embodiment, an all-software embodiment (including firmware, resident software, micro-code, etc. ) or an embodiment combining software and hardware aspects.
  • one or more embodiments may take the form of a program product embodied in one or more computer readable storage devices storing machine readable code, computer readable code, and/or program code, referred to hereafter as “code. ”
  • code computer readable code
  • the storage devices may be tangible, non-transitory, and/or non-transmission.
  • references throughout this specification to “one embodiment, ” “an embodiment, ” “an example, ” “some embodiments, ” “some examples, ” or similar language means that a particular feature, structure, or characteristic described is included in at least one embodiment or example.
  • instances of the phrases “in one embodiment, ” “in an example, ” “in some embodiments, ” and similar language throughout this specification may, but do not necessarily, all refer to the same embodiment (s) . It may or may not include all the embodiments disclosed.
  • Features, structures, elements, or characteristics described in connection with one or some embodiments are also applicable to other embodiments, unless expressly specified otherwise.
  • the terms “including, ” “comprising, ” “having, ” and variations thereof mean “including but not limited to, ” unless expressly specified otherwise.
  • first, ” “second, ” “third, ” and etc. are all used as nomenclature only for references to relevant devices, components, procedural steps, and etc. without implying any spatial or chronological orders, unless expressly specified otherwise.
  • a “first device” and a “second device” may refer to two separately formed devices, or two parts or components of the same device. In some cases, for example, a “first device” and a “second device” may be identical, and may be named arbitrarily.
  • a “first step” of a method or process may be carried or performed after, or simultaneously with, a “second step. ”
  • a and/or B may refer to any one of the following three combinations: existence of A only, existence of B only, and co-existence of both A and B.
  • the character “/” generally indicates an “or” relationship of the associated items. This, however, may also include an “and” relationship of the associated items.
  • A/B means “A or B, ” which may also include the co-existence of both A and B, unless the context indicates otherwise.
  • the code may also be stored in a storage device that can direct a computer, other programmable data processing apparatus, or other devices to function in a particular manner, such that the instructions stored in the storage device produce an article of manufacture including instructions which implement the function or act specified in the schematic flowchart diagrams and/or schematic block diagrams.
  • each block in the schematic flowchart diagrams and/or schematic block diagrams may represent a module, segment, or portion of code, which includes one or more executable instructions of the code for implementing the specified logical function (s) .
  • the flowchart diagrams need not necessarily be practiced in the sequence shown and are able to be practiced without one or more of the specific steps, or with other steps not shown.
  • Figure 1 is a schematic diagram illustrating a wireless communication system. It depicts an embodiment of a wireless communication system 100.
  • the wireless communication system 100 may include a user equipment (UE) 102 and a network equipment (NE) 104. Even though a specific number of UEs 102 and NEs 104 is depicted in Figure 1, one skilled in the art will recognize that any number of UEs 102 and NEs 104 may be included in the wireless communication system 100.
  • UE user equipment
  • NE network equipment
  • the UEs 102 may be referred to as remote devices, remote units, subscriber units, mobiles, mobile stations, users, terminals, mobile terminals, fixed terminals, subscriber stations, user terminals, apparatus, devices, user device, or by other terminology used in the art.
  • the UEs 102 may be autonomous sensor devices, alarm devices, actuator devices, remote control devices, or the like.
  • the UEs 102 may include computing devices, such as desktop computers, laptop computers, personal digital assistants (PDAs) , tablet computers, smart phones, smart televisions (e.g., televisions connected to the Internet) , set-top boxes, game consoles, security systems (including security cameras) , vehicle on-board computers, network devices (e.g., routers, switches, modems) , or the like.
  • the UEs 102 include wearable devices, such as smart watches, fitness bands, optical head-mounted displays, or the like. The UEs 102 may communicate directly with one or more of the NEs 104.
  • the NE 104 may also be referred to as a base station, an access point, an access terminal, a base, a Node-B, an eNB, a gNB, a Home Node-B, a relay node, an apparatus, a device, or by any other terminology used in the art.
  • a reference to a base station may refer to any one of the above referenced types of the network equipment 104, such as the eNB and the gNB.
  • the NEs 104 may be distributed over a geographic region.
  • the NE 104 is generally part of a radio access network that includes one or more controllers communicably coupled to one or more corresponding NEs 104.
  • the radio access network is generally communicably coupled to one or more core networks, which may be coupled to other networks, like the Internet and public switched telephone networks. These and other elements of radio access and core networks are not illustrated, but are well known generally by those having ordinary skill in the art.
  • the wireless communication system 100 is compliant with a 3GPP 5G new radio (NR) .
  • the wireless communication system 100 is compliant with a 3GPP protocol, where the NEs 104 transmit using an OFDM modulation scheme on the DL and the UEs 102 transmit on the uplink (UL) using a SC-FDMA scheme or an OFDM scheme.
  • the wireless communication system 100 may implement some other open or proprietary communication protocols, for example, WiMAX.
  • WiMAX open or proprietary communication protocols
  • the NE 104 may serve a number of UEs 102 within a serving area, for example, a cell (or a cell sector) or more cells via a wireless communication link.
  • the NE 104 transmits DL communication signals to serve the UEs 102 in the time, frequency, and/or spatial domain.
  • Communication links are provided between the NE 104 and the UEs 102a, 102b, which may be NR UL or DL communication links, for example. Some UEs 102 may simultaneously communicate with different Radio Access Technologies (RATs) , such as NR and LTE. Direct or indirect communication link between two or more NEs 104 may be provided.
  • RATs Radio Access Technologies
  • the NE 104 may also include one or more transmit receive points (TRPs) 104a.
  • TRPs transmit receive points
  • the network equipment may be a gNB 104 that controls a number of TRPs 104a.
  • the network equipment may be a TRP 104a that is controlled by a gNB.
  • Communication links are provided between the NEs 104, 104a and the UEs 102, 102a, respectively, which, for example, may be NR UL/DL communication links. Some UEs 102, 102a may simultaneously communicate with different Radio Access Technologies (RATs) , such as NR and LTE.
  • RATs Radio Access Technologies
  • the UE 102a may be able to communicate with two or more TRPs 104a that utilize a non-ideal or ideal backhaul, simultaneously.
  • a TRP may be a transmission point of a gNB. Multiple beams may be used by the UE and/or TRP (s) .
  • the two or more TRPs may be TRPs of different gNBs, or a same gNB. That is, different TRPs may have the same Cell-ID or different Cell-IDs.
  • TRP Transmission Reception Point
  • transmitting-receiving identity may be used interchangeably throughout the disclosure.
  • FIG. 2 is a schematic block diagram illustrating components of user equipment (UE) according to one embodiment.
  • a UE 200 may include a processor 202, a memory 204, an input device 206, a display 208, and a transceiver 210.
  • the input device 206 and the display 208 are combined into a single device, such as a touchscreen.
  • the UE 200 may not include any input device 206 and/or display 208.
  • the UE 200 may include one or more processors 202 and may not include the input device 206 and/or the display 208.
  • the processor 202 may include any known controller capable of executing computer-readable instructions and/or capable of performing logical operations.
  • the processor 202 may be a microcontroller, a microprocessor, a central processing unit (CPU) , a graphics processing unit (GPU) , an auxiliary processing unit, a field programmable gate array (FPGA) , or similar programmable controller.
  • the processor 202 executes instructions stored in the memory 204 to perform the methods and routines described herein.
  • the processor 202 is communicatively coupled to the memory 204 and the transceiver 210.
  • the memory 204 in one embodiment, is a computer readable storage medium.
  • the memory 204 includes volatile computer storage media.
  • the memory 204 may include a RAM, including dynamic RAM (DRAM) , synchronous dynamic RAM (SDRAM) , and/or static RAM (SRAM) .
  • the memory 204 includes non-volatile computer storage media.
  • the memory 204 may include a hard disk drive, a flash memory, or any other suitable non-volatile computer storage device.
  • the memory 204 includes both volatile and non-volatile computer storage media.
  • the memory 204 stores data relating to trigger conditions for transmitting the measurement report to the network equipment.
  • the memory 204 also stores program code and related data.
  • the input device 206 may include any known computer input device including a touch panel, a button, a keyboard, a stylus, a microphone, or the like.
  • the input device 206 may be integrated with the display 208, for example, as a touchscreen or similar touch-sensitive display.
  • the display 208 may include any known electronically controllable display or display device.
  • the display 208 may be designed to output visual, audio, and/or haptic signals.
  • the transceiver 210 in one embodiment, is configured to communicate wirelessly with the network equipment.
  • the transceiver 210 comprises a transmitter 212 and a receiver 214.
  • the transmitter 212 is used to transmit UL communication signals to the network equipment and the receiver 214 is used to receive DL communication signals from the network equipment.
  • the transmitter 212 and the receiver 214 may be any suitable type of transmitters and receivers. Although only one transmitter 212 and one receiver 214 are illustrated, the transceiver 210 may have any suitable number of transmitters 212 and receivers 214.
  • the UE 200 includes a plurality of the transmitter 212 and the receiver 214 pairs for communicating on a plurality of wireless networks and/or radio frequency bands, with each of the transmitter 212 and the receiver 214 pairs configured to communicate on a different wireless network and/or radio frequency band.
  • FIG. 3 is a schematic block diagram illustrating components of network equipment (NE) 300 according to one embodiment.
  • the NE 300 may include a processor 302, a memory 304, an input device 306, a display 308, and a transceiver 310.
  • the processor 302, the memory 304, the input device 306, the display 308, and the transceiver 310 may be similar to the processor 202, the memory 204, the input device 206, the display 208, and the transceiver 210 of the UE 200, respectively.
  • the processor 302 controls the transceiver 310 to transmit DL signals or data to the UE 200.
  • the processor 302 may also control the transceiver 310 to receive UL signals or data from the UE 200.
  • the processor 302 may control the transceiver 310 to transmit DL signals containing various configuration data to the UE 200.
  • the transceiver 310 comprises a transmitter 312 and a receiver 314.
  • the transmitter 312 is used to transmit DL communication signals to the UE 200 and the receiver 314 is used to receive UL communication signals from the UE 200.
  • the transceiver 310 may communicate simultaneously with a plurality of UEs 200.
  • the transmitter 312 may transmit DL communication signals to the UE 200.
  • the receiver 314 may simultaneously receive UL communication signals from the UE 200.
  • the transmitter 312 and the receiver 314 may be any suitable type of transmitters and receivers. Although only one transmitter 312 and one receiver 314 are illustrated, the transceiver 310 may have any suitable number of transmitters 312 and receivers 314.
  • the NE 300 may serve multiple cells and/or cell sectors, where the transceiver 310 includes a transmitter 312 and a receiver 314 for each cell or cell sector.
  • non-codebook based PUSCH can transmit with up to 4 layers using 4 SRS resources in the same SRS resource set.
  • the gNB schedules the PUSCH and indicates the set of SRS resources to be used for transmission in the SRI field. Because there are only up to 4 different SRS resources to choose from, and the maximal transmission rank (L MAX ) is 4, the SRI can indicate one of up to 15 states using no more than 4 bits.
  • the allowed combinations of SRS resources for different numbers of SRS resources (N SRS ) and different maximal transmission ranks (L MAX ) are listed in the following tables from Table 7.3.1.1.2-28 to Table 7.3.1.1.2-31.
  • the SRI indicates an entry from the table to signal the UE the set of SRS resources to be used.
  • the SRI field can be in DCI format 0_1 or 0_2 for dynamically scheduled PUSCH or CG-Type2 PUSCH, or configured by RRC for CG-Type1 PUSCH.
  • DCI format 0_1 or 0_2 2 bits are used for SRI (if the SRI field is configured) .
  • DCI format 0_1 is used for the scheduling of one or multiple PUSCH in one cell, or indicating CG downlink feedback information (CG-DFI) to a UE.
  • CG-DFI CG downlink feedback information
  • the following information is transmitted by means of the DCI format 0_1 with CRC scrambled by C-RNTI or CS-RNTI or SP-CSI-RNTI or MCS-C-RNTI.
  • N SRS is the number of configured SRS resources in the SRS resource set indicated by SRS resource set indicator field if present; otherwise N SRS is the number of configured SRS resources in the SRS resource set configured by higher layer parameter srs-ResourceSetToAddModList and associated with the higher layer parameter usage of value 'codeBook' or 'nonCodeBook' ,
  • N SRS is the number of configured SRS resources in the SRS resource set indicated by SRS resource set indicator field if present, otherwise N SRS is the number of configured SRS resources in the SRS resource set configured by higher layer parameter srs-ResourceSetToAddModList and associated with the higher layer parameter usage of value 'nonCodeBook' , and
  • L max is given by that parameter
  • L max is given by the maximum number of layers for PUSCH supported by the UE for the serving cell for non-codebook based operation.
  • N SRS is the number of configured SRS resources in the SRS resource set indicated by SRS resource set indicator field if present, otherwise N SRS is the number of configured SRS resources in the SRS resource set configured by higher layer parameter srs-ResourceSetToAddModList and associated with the higher layer parameter usage of value 'codeBook' .
  • N SRS is the number of configured SRS resources in the second SRS resource set
  • L max is given by that parameter
  • L max is given by the maximum number of layers for PUSCH supported by the UE for the serving cell for non-codebook based operation.
  • N SRS is the number of configured SRS resources in the second SRS resource set.
  • PTRS For PTRS, one or two PTRS ports can be configured, and each PTRS port is associated with a DMRS port.
  • the DCI format 0_1/0_2 contains a PTRS-DMRS association field to signal this relationship to the UE for the PUSCH transmission:
  • Table 7.3.1.1.2-25/7.3.1.1.2-25A and 7.3.1.1.2-26 are used to indicate the association between PTRS port (s) and DMRS port (s) when one PTRS port and two PTRS ports are configured by maxNrofPorts in PTRS-UplinkConfig respectively, and the DMRS ports are indicated by the Antenna ports field.
  • SRS resource set indicator field is present and maxRank>2
  • this field indicates the association between PTRS port (s) and DMRS port (s) corresponding to SRS resource indicator field and/or Precoding information and number of layers field according to Table 7.3.1.1.2-25 and 7.3.1.1.2-26.
  • the MSB of this field indicates the association between PTRS port (s) and DMRS port (s) corresponding to SRS resource indicator and/or Precoding information and number of layers field
  • the LSB of this field indicates the association between PTRS port (s) and DMRS port (s) corresponding to Second SRS resource indicator field and/or Second Precoding information field, according to Table 7.3.1.1.2-25A.
  • Second bandwidth part indicator indicates a bandwidth part other than the active bandwidth part and the "PTRS-DMRS association” field is present for the indicated bandwidth part but not present for the active bandwidth part, the UE assumes the "PTRS-DMRS association" field is not present for the indicated bandwidth part.
  • a new SRI indication scheme for non-codebook based PUSCH for UE with 8 TX antenna ports is proposed.
  • the scheme reduces the SRI overhead.
  • a PTRS-DMRS association indication scheme is also proposed to indicate the DMRS ports used to transmit the PTRS port 0 and port 1.
  • Each of the N SRS SRS resources has a single port.
  • the SRI field in the DCI format 0_1 or 0_2 needs to indicate a subset of r SRS resources in the SRS resource set for use in NCB-based PUSCH, where 1 ⁇ r ⁇ L max , L max ⁇ N SRS is the maximal rank configured in maxMIMO-Layers.
  • a new SRI indication scheme for 8 TX ports with less than 32 states is designed, such that only 5 bits will be needed instead of 8 bits for the SRI indication field.
  • the new scheme is partially based on the SRI indicators for 4 TX ports in the legacy system.
  • the SRI indication scheme includes partitioning the N SRS SRS resources into two groups: a first group and a second group, where the first group includes SRS resources ⁇ 0, 1, 2, 3 ⁇ and the second group includes the remaining SRS resources ⁇ 4, ..., N SRS -1 ⁇ .
  • the transmission rank r is the number of the SRS resources indicated by the SRI.
  • the SRS resources in the first group ⁇ 0, 1, 2, 3 ⁇ are always used to transmit 4 layers. This leaves only the need to indicate additional r-4 SRS resources from the second group for a total of r SRS resources. By always using the first four SRS resources, the required number of SRI indicators for r>4 is greatly reduced.
  • N SRS The number of SRS resources
  • L max the maximal number of layers
  • the resources in the SRS resource set are partitioned into a first resource group and a second resource group when the total number of SRS resources in the SRS resource set is larger than four.
  • the first resource group comprises SRS resources ⁇ 0, 1, 2, 3 ⁇ ; and the second resource group comprises SRS resources ⁇ 4, ..., N SRS -1 ⁇ .
  • the SRI is transmitted to the UE in DCI format 0_1 or 0_2.
  • the SRI is transmitted as part of RRC configuration (e.g., in srs-ResourceIndicator of ConfiguredGrantConfig) .
  • the PUSCH is transmitted to a single TRP without repetitions.
  • the same method may also be applied to multiple TRP transmissions with repetitions, with a Second SRI indication similar to Table 7.3.1.1.2-29A or Table 7.3.1.1.2-30A.
  • a UE implementation may be introduced, taking advantage of the new SRI indication tables.
  • the N SRS SRS resources are divided into two groups.
  • the SRS resources in the first group ⁇ 0, 1, 2, 3 ⁇ are exclusively used for ranks 1-4, and are always used for rank higher than 4.
  • the SRS resources in the second group ⁇ 4, ..., N SRS -1 ⁇ are only used when the rank is higher than 4.
  • each SRS resource is based on a precoding vector orthogonal to the others, and the UE has the freedom to arrange these precoding vectors in any order.
  • SVD Singular Value Decomposition
  • v 0 is used as SRS resource 0
  • v 1 is used as SRS resource 1
  • ... is used as SRS resource N SRS -1
  • the qualities of these SRS resources are also in descending order. It may therefore be preferable to use SRS resource i before SRS resource j, for any 0 ⁇ i, j ⁇ N SRS -1 .
  • the UE only needs to arrange these SRS resources such that the qualities in the first group ⁇ 0, 1, 2, 3 ⁇ are higher than the resources in the second group ⁇ 4, ..., N SRS -1 ⁇ . It can be proven that for SU-MIMO, this SRI indication scheme, with only 30 entries, has the same performance as the SRI scheme with all 255 states (i.e., all combinations for the 8 SRS resources) . For MU-MIMO, there may be performance degradation when multiple UEs transmit in the same resources due to the limited SRS resources that can be indicated.
  • the UE estimates a channel through measurement of an associated Channel State Information Reference Signal (CSI-RS) ; determines a set of precoders for single port SRS resources for non-codebook based PUSCH, based on the measurement; and determines a precoder for each of the SRS resources based on relative strength of the precoders.
  • the SRS resources are sorted based on the relative strength of corresponding precoders in descending order.
  • the legacy scheme can be reused, since the SRI indication table is reused for 1 ⁇ r ⁇ 4, and the new SRS resources ⁇ 4, ..., N SRS -1 ⁇ are not used.
  • Each of SRS resources ⁇ 0, 1, 2, 3 ⁇ is associated with a PTRS port index in a same manner as that in the legacy system.
  • Table 7.3.1.1.2-25 of TS 38.212 is reused with a limitation that L max ⁇ 4, shown as Table 9 below.
  • Table 9 PTRS-DMRS association or Second PTRS-DMRS association for UL PTRS port 0 when L max ⁇ 4
  • Table 7.3.1.1.2-26 of TS 38.212 is reused with a limitation that L max ⁇ 4, shown as Table 10 below.
  • Table 10 PTRS-DMRS association or Second PTRS-DMRS association for UL PTRS ports 0 and 1 when L max ⁇ 4
  • new PTRS-DMRS association needs to be defined because the PRTS port (s) may be associated with the 5 th (or higher) DMRS port.
  • one PTRS port When one PTRS port is configured or is actually transmitted (for example, 2 PTRS ports are configured but the scheduled PUSCH has only 1 layer, so only one PTRS port is transmitted) , it is associated with one of the scheduled DMRS ports.
  • the association may be based on one of two schemes below.
  • Table 11 PTRS-DMRS association or Second PTRS-DMRS association for UL PTRS port 0 when L max >4
  • the DMRS of one the two codewords may be used for association. This makes it sufficient to use 2 bits to signal the DMRS ports, since a CW has at most 4 layers.
  • the CW with the higher Modulation Coding Scheme (MCS) may be used.
  • MCS Modulation Coding Scheme
  • the first CW (CW0) is used.
  • PTRS port 0 is associated with the i th DMRS port used in this codeword, where the value i is indicated according to Table 12 below.
  • Table 12 PTRS-DMRS association or Second PTRS-DMRS association for UL PTRS port 0 when L max >4
  • each of them is associated with a DMRS port.
  • the association may be based on one of two schemes below.
  • the association is based on the associated PRTS port configured in the SRS resources (i.e., the PTRS associated with an SRS resource for nonCodebook is configured in SRS-resourceConfig in ptrs-PortIndex) .
  • the SRS resources indicated by the SRI and the PUSCH ports transmitted 1000, 1001, 1002, etc
  • the PRTS-DMRS association field further indicates the DMRS associated with the PTRS.
  • Table 13 shows an example of PTRS-DMRS association according to this scheme.
  • Table 13 PTRS-DMRS association or Second PTRS-DMRS association for UL PTRS ports 0 and 1
  • SRS resources ⁇ 0, 1, 2, 3 ⁇ are RRC configured to associate with PTRS port 0, and SRS resources ⁇ 4, 5, 6, 7 ⁇ to associate with PTRS port 1.
  • the SRI field indicates 6 SRS resources, ⁇ 0, 1, 2, 3, 4, 7 ⁇ , to be used to transmit a PUSCH with 6 layers.
  • the MSB of the PTRS-DMRS association field is 1, and the LSB of the PTRS-DMRS association field is 1; and the “antenna port” field signals DMRS ports ⁇ d0, d1, d2, d3, d4, d5 ⁇ .
  • PTRS port 0 is associated with SRS resource 1 and with DMRS port d1
  • PRTS port 1 is associated with SRS resource 7 and with DMRS port d5.
  • the association is based on the SRS resources used in each codeword (CW) .
  • Two codewords, CW0 and CW1 are transmitted and the SRS resources used to transmit each codeword are based on the codeword-to-layer mapping. It has been agreed that the codeword-to-layer mapping rule for 2 CWs for PDSCH is to be reused for PUSCH. That is, for rank r > 4, the first codeword (CW0) is transmitted with the first SRS resources indicated by the SRI field, and the second codeword (CW1) is transmitted with the remaining SRS resources.
  • Each codeword has its own PTRS port.
  • the MSB (or LSB) of the PTRS-DMRS association field signals which DMRS port used in CW0 (or CW1) is associated with PTRS port 0 (or port 1) , and the SRS resources used. Transmitting PTRS port 0 and port 1 from the SRS resources of CW0 and CW1 respectively has the advantage that each CW can have its phase tracked by a dedicated PTRS port.
  • Table 14 shows an example of PTRS-DMRS association according to this scheme.
  • Table 14 PTRS-DMRS association or Second PTRS-DMRS association for UL PTRS ports 0 and 1
  • the SRI field indicates 6 SRS resources, ⁇ 0, 1, 2, 3, 4, 7 ⁇ , to be used to transmit a PUSCH with 6 layers.
  • CW0 is transmitted using SRS resources ⁇ 0, 1, 2 ⁇ and CW1 is transmitted using SRS resources ⁇ 3, 4, 7 ⁇ .
  • MSB of the PTRS-DMRS association field is 0, and the LSB of the PTRS-DMRS association field is 1; and the “antenna port” field signals DMRS ports ⁇ d0, d1, d2, d3, d4, d5 ⁇ .
  • PTRS port 0 is transmitted using the 1 st DMRS port (d0) used in CW0 (using the SRS resource 0)
  • PTRS port 1 is transmitted using the 2 nd DMRS port (d4) used in CW1 (using the SRS resource 4) .
  • Figure 4 is a flow chart illustrating steps of SRS resource indication for non-codebook based PUSCH by gNB 300 in accordance with some implementations of the present disclosure.
  • the transmitter 312 of gNB 300 transmits Downlink Control Information (DCI) for scheduling a non-codebook based Physical Uplink Shared Channel (PUSCH) transmission.
  • DCI Downlink Control Information
  • the receiver 314 of gNB 300 receives the non-codebook based PUSCH transmission from a remote device that includes eight antenna ports.
  • Figure 5 is a flow chart illustrating steps of SRS resource indication for non-codebook based PUSCH by UE 200 in accordance with some implementations of the present disclosure.
  • the receiver 214 of UE 200 receives Downlink Control Information (DCI) for scheduling a non-codebook based Physical Uplink Shared Channel (PUSCH) transmission.
  • DCI Downlink Control Information
  • the processor 202 of UE 200 determines resources for the non-codebook based PUSCH transmission based on the DCI.
  • the transmitter 212 of UE 200 transmits the non-codebook based PUSCH transmission, wherein the transmitter includes eight antenna ports.
  • Figure 6 is a flow chart illustrating steps of PTRS-DMRS association by gNB in accordance with some implementations of the present disclosure.
  • the transmitter 312 of gNB 300 transmits an indication of association between one or more Demodulation Reference Signal (DMRS) ports and one or more Phase-Tracking Reference Signal (PTRS) ports, together with SRS resources used to transmit codewords.
  • DMRS Demodulation Reference Signal
  • PTRS Phase-Tracking Reference Signal
  • the processor 302 of gNB 300 determines for a PTRS port a DMRS port that is associated with the PTRS port through a SRS resource configuration, or a DMRS port that is used to transmit the corresponding codewords.
  • An apparatus comprising:
  • DCI Downlink Control Information
  • PUSCH Physical Uplink Shared Channel
  • a receiver that receives the non-codebook based PUSCH transmission from a remote device that includes eight antenna ports.
  • the DCI comprises a Sounding Reference Signal (SRS) Resource Indicator (SRI) , wherein the SRI indicates a combination of SRS resources that are from an SRS resource set based on an SRI indication scheme;
  • SRS Sounding Reference Signal
  • SRI Resource Indicator
  • the apparatus further comprises a processor that determines a transmission rank as a number of the SRS resources indicated by the SRI;
  • the non-codebook based PUSCH transmission is transmitted with resources corresponding to the SRS resources indicated by the SRI.
  • the SRS resources indicated by the SRI comprise all resources in the first resource group and a subset of the second resource group where the transmission rank is larger than four.
  • the transmitter further transmits an indication of association between one or more Demodulation Reference Signal (DMRS) ports and one or more Phase-Tracking Reference Signal (PTRS) ports, together with SRS resources used to transmit codewords; and
  • DMRS Demodulation Reference Signal
  • PTRS Phase-Tracking Reference Signal
  • the apparatus further comprises a processor that determines for a PTRS port a DMRS port that is associated with the PTRS port through a SRS resource configuration, or a DMRS port that is used to transmit the corresponding codewords.
  • the codeword is the one with the higher Modulation Coding Scheme (MCS) , or the first codeword if two codewords have the same MCS; when two PTRS are transmitted, each is transmitted with a codeword.
  • MCS Modulation Coding Scheme
  • An apparatus comprising:
  • DCI Downlink Control Information
  • PUSCH Physical Uplink Shared Channel
  • a processor that determines resources for the non-codebook based PUSCH transmission based on the DCI
  • the transmitter includes eight antenna ports.
  • the DCI comprises a Sounding Reference Signal (SRS) Resource Indicator (SRI) , wherein the SRI indicates a combination of SRS resources that are from an SRS resource set based on an SRI indication scheme;
  • SRS Sounding Reference Signal
  • SRI Resource Indicator
  • the processor further determines a transmission rank as a number of the SRS resources indicated by the SRI.
  • the non-codebook based PUSCH transmission is transmitted with resources corresponding to the SRS resources indicated by the SRI.
  • the SRS resources indicated by the SRI comprise all resources in a first resource group with SRS resources ⁇ 0, 1, 2, 3 ⁇ and a subset of a second resource group with SRS resources ⁇ 4, ..., N SRS -1 ⁇ , where N SRS represents the number of the SRS resources indicated by the SRI.
  • SRI is configured by Radio Resource Control (RRC) for configured PUSCH, in srs-ResourceIndicator of ConfiguredGrantConfig.
  • RRC Radio Resource Control
  • CSI-RS Channel State Information Reference Signal
  • the receiver further receives an indication of association between one or more Demodulation Reference Signal (DMRS) ports and one or more Phase-Tracking Reference Signal (PTRS) ports, together with SRS resources used to transmit codewords; and
  • DMRS Demodulation Reference Signal
  • PTRS Phase-Tracking Reference Signal
  • its indicated DMRS port is associated with the PTRS port through a SRS resource configuration, or a DMRS port used to transmit the corresponding codewords.
  • the codeword is the one with the higher Modulation Coding Scheme (MCS) , or the first codeword if two codewords have the same MCS; when two PTRS are transmitted, each is transmitted with a codeword.
  • MCS Modulation Coding Scheme
  • a method comprising:
  • DCI Downlink Control Information
  • the DCI comprises a Sounding Reference Signal (SRS) Resource Indicator (SRI) , wherein the SRI indicates a combination of SRS resources that are from an SRS resource set based on an SRI indication scheme;
  • SRS Sounding Reference Signal
  • SRI Resource Indicator
  • the method further comprises determining, by a processor, a transmission rank as a number of the SRS resources indicated by the SRI;
  • the non-codebook based PUSCH transmission is transmitted with resources corresponding to the SRS resources indicated by the SRI.
  • the transmitter further transmits an indication of association between one or more Demodulation Reference Signal (DMRS) ports and one or more Phase-Tracking Reference Signal (PTRS) ports, together with SRS resources used to transmit codewords; and
  • DMRS Demodulation Reference Signal
  • PTRS Phase-Tracking Reference Signal
  • the method further comprises determining for a PTRS port, by a processor, a DMRS port that is associated with the PTRS port through a SRS resource configuration, or a DMRS port that is used to transmit the corresponding codewords.
  • the codeword is the one with the higher Modulation Coding Scheme (MCS) , or the first codeword if two codewords have the same MCS; when two PTRS are transmitted, each is transmitted with a codeword.
  • MCS Modulation Coding Scheme
  • a method comprising:
  • DCI Downlink Control Information
  • the transmitter transmitting, by a transmitter, the non-codebook based PUSCH transmission, wherein the transmitter includes eight antenna ports.
  • the DCI comprises a Sounding Reference Signal (SRS) Resource Indicator (SRI) , wherein the SRI indicates a combination of SRS resources that are from an SRS resource set based on an SRI indication scheme;
  • SRS Sounding Reference Signal
  • SRI Resource Indicator
  • the processor further determines a transmission rank as a number of the SRS resources indicated by the SRI.
  • the non-codebook based PUSCH transmission is transmitted with resources corresponding to the SRS resources indicated by the SRI.
  • CSI-RS Channel State Information Reference Signal
  • the receiver further receives an indication of association between one or more Demodulation Reference Signal (DMRS) ports and one or more Phase-Tracking Reference Signal (PTRS) ports, together with SRS resources used to transmit codewords; and
  • DMRS Demodulation Reference Signal
  • PTRS Phase-Tracking Reference Signal
  • its indicated DMRS port is associated with the PTRS port through a SRS resource configuration, or a DMRS port used to transmit the corresponding codewords.
  • the codeword is the one with the higher Modulation Coding Scheme (MCS) , or the first codeword if two codewords have the same MCS; when two PTRS are transmitted, each is transmitted with a codeword.
  • MCS Modulation Coding Scheme

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Abstract

Procédés et appareil d'indication de ressource de SRS pour un PUSCH non basé sur un livre de codes. L'appareil comprend un émetteur qui transmet des informations de commande de liaison descendante (DCI) pour planifier une transmission de canal partagé de liaison montante physique (PUSCH) non basée sur un livre de codes; et un récepteur qui reçoit la transmission PUSCH non basée sur un livre de codes depuis un dispositif distant qui comprend huit ports d'antenne.
PCT/CN2023/094162 2023-05-15 2023-05-15 Procédés et appareil d'indication de ressource de srs pour pusch non basé sur un livre de codes WO2024074040A1 (fr)

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Citations (4)

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Publication number Priority date Publication date Assignee Title
WO2022208482A1 (fr) * 2021-04-02 2022-10-06 Telefonaktiebolaget Lm Ericsson (Publ) Systèmes et procédés pour pusch multi-trp non basé sur un livre de codes
WO2022236495A1 (fr) * 2021-05-08 2022-11-17 Apple Inc. Sélection de panneau pour transmission en liaison montante
CN115720105A (zh) * 2017-10-02 2023-02-28 瑞典爱立信有限公司 高效的srs资源指示方法
US20230063015A1 (en) * 2020-02-13 2023-03-02 Telefonaktiebolaget Lm Ericsson (Publ) NON-CODEBOOK BASED MULTI-TRP PUSCH RELIABILITY WITH MULTIPLE ASSOCIATED NZP CSI-RSs

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Publication number Priority date Publication date Assignee Title
CN115720105A (zh) * 2017-10-02 2023-02-28 瑞典爱立信有限公司 高效的srs资源指示方法
US20230063015A1 (en) * 2020-02-13 2023-03-02 Telefonaktiebolaget Lm Ericsson (Publ) NON-CODEBOOK BASED MULTI-TRP PUSCH RELIABILITY WITH MULTIPLE ASSOCIATED NZP CSI-RSs
WO2022208482A1 (fr) * 2021-04-02 2022-10-06 Telefonaktiebolaget Lm Ericsson (Publ) Systèmes et procédés pour pusch multi-trp non basé sur un livre de codes
WO2022236495A1 (fr) * 2021-05-08 2022-11-17 Apple Inc. Sélection de panneau pour transmission en liaison montante

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ZTE: "Draft alignment CR on non-codebook based PUSCH", 3GPP DRAFT; R1-1908270 DRAFT ALIGNMENT CR ON NON-CODEBOOK BASED PUSCH, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Prague, CZ; 20190826 - 20190830, 17 August 2019 (2019-08-17), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051764884 *
ZTE: "Draft CR on time domain behavior of SRS for configured grant PUSCH", 3GPP DRAFT; R1-1904754 DRAFT CR ON TIME DOMAIN BEHAVIOR OF SRS FOR CONFIGURED GRANT PUSCH, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Xi’an, China; 20190408 - 20190412, 30 March 2019 (2019-03-30), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051691740 *

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