WO2024069591A1 - Dispositifs, procédés et appareils d'amélioration de srs - Google Patents

Dispositifs, procédés et appareils d'amélioration de srs Download PDF

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Publication number
WO2024069591A1
WO2024069591A1 PCT/IB2023/059813 IB2023059813W WO2024069591A1 WO 2024069591 A1 WO2024069591 A1 WO 2024069591A1 IB 2023059813 W IB2023059813 W IB 2023059813W WO 2024069591 A1 WO2024069591 A1 WO 2024069591A1
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WIPO (PCT)
Prior art keywords
occ
sequence
srs
sequences
length
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PCT/IB2023/059813
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English (en)
Inventor
Pasi Eino Tapio Kinnunen
Juha Pekka Karjalainen
Youngsoo Yuk
Petri Luoto
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Nokia Technologies Oy
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Publication of WO2024069591A1 publication Critical patent/WO2024069591A1/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
    • 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
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/26035—Maintenance of orthogonality, e.g. for signals exchanged between cells or users, or by using covering codes or sequences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0016—Time-frequency-code

Definitions

  • Embodiments of the present disclosure generally relate to the field of communication, and in particular, to devices, methods, apparatuses and computer readable storage medium for sounding reference signal (SRS) enhancement.
  • SRS sounding reference signal
  • example embodiments of the present disclosure provide devices, methods, apparatuses and computer readable storage medium for SRS enhancement.
  • the terminal device may comprise one or more transceivers; and one or more processors communicatively coupled to the one or more transceivers, and the one or more processors are configured to cause the terminal device to: receive, from a network device, sounding reference signal, SRS, configuration information indicating one or more orthogonal cover code, OCC, sequences in frequency domain, wherein the one or more OCC sequences have a length of one or more of 3 or 6; and transmit, to the network device, a SRS signal using an OCC sequence from the one or more OCC sequences.
  • SRS sounding reference signal
  • OCC orthogonal cover code
  • the network device may comprise one or more transceivers; and one or more processors communicatively coupled to the one or more transceivers, and the one or more processors are configured to cause the network device to: transmit, to a terminal device, sounding reference signal, SRS, configuration information indicating one or more orthogonal cover code, OCC, sequences in frequency domain, wherein the one or more OCC sequences have a length of one or more of 3 or 6; and receive, from the terminal device, a SRS signal using an OCC sequence from the one or more OCC sequences.
  • a method implemented at a terminal device may comprise: receiving, from a network device, sounding reference signal, SRS, configuration information indicating one or more orthogonal cover code, OCC, sequences in frequency domain, wherein the one or more OCC sequences have a length of one or more of 3 or 6; and transmitting, to the network device, a SRS signal using an OCC sequence from the one or more OCC sequences.
  • a method implemented at a network device may comprise: transmitting, to a terminal device, sounding reference signal, SRS, configuration information indicating one or more orthogonal cover code, OCC, sequences in frequency domain, wherein the one or more OCC sequences have a length of one or more of 3 or 6; and receiving, from the terminal device, a SRS signal using an OCC sequence from the one or more OCC sequences.
  • an apparatus of a terminal device may comprise: means for receiving, from a network device, sounding reference signal, SRS, configuration information indicating one or more orthogonal cover code, OCC, sequences in frequency domain, wherein the one or more OCC sequences have a length of one or more of 3 or 6; and transmitting, to the network device, a SRS signal using an OCC sequence from the one or more OCC sequences.
  • an apparatus of a network device may comprise: means for transmitting, to a terminal device, sounding reference signal, SRS, configuration information indicating one or more orthogonal cover code, OCC, sequences in frequency domain, wherein the one or more OCC sequence have a length of one or more of 3 or 6; and means for receiving, from the terminal device, a SRS signal using an OCC sequence from the one or more OCC sequences.
  • a terminal device may comprise at least one processor; and at least one memory including computer program codes, wherein the at least one memory and the computer program codes are configured to, with the at least one processor, cause the terminal device to: receive, from a network device, sounding reference signal, SRS, configuration information indicating one or more orthogonal cover code, OCC, sequences in frequency domain, wherein the one or more OCC sequences have a length of one or more of 3 or 6; and transmit, to the network device, a SRS signal using an OCC sequence from the one or more OCC sequences.
  • SRS sounding reference signal
  • OCC orthogonal cover code
  • the network device may comprise at least one processor; and at least one memory including computer program codes, wherein the at least one memory and the computer program codes are configured to, with the at least one processor, cause the network device to: transmit, to a terminal device, sounding reference signal, SRS, configuration information indicating one or more orthogonal cover code, OCC, sequences in frequency domain, wherein the one or more OCC sequences have a length of one or more of 3 or 6; and receive, from the terminal device, a SRS signal using an OCC sequence from the one or more OCC sequences.
  • SRS sounding reference signal
  • OCC orthogonal cover code
  • a ninth aspect there is provided a non-transitory computer readable medium comprising program instructions for causing an apparatus to perform at least the method according to third or fourth aspect.
  • a computer program comprising instructions, which, when executed by an apparatus, cause the apparatus at least to: receive, from a network device, sounding reference signal, SRS, configuration information indicating one or more orthogonal cover code, OCC, sequences in frequency domain, wherein the one or more OCC sequences have a length of one or more of 3 or 6; and transmit, to the network device, a SRS signal using an OCC sequence from the one or more OCC sequences.
  • a computer program comprising instructions, which, when executed by an apparatus, cause the apparatus at least to: transmit, to a terminal device, sounding reference signal, SRS, configuration information indicating one or more orthogonal cover code, OCC, sequences in frequency domain, wherein the one or more OCC sequences have a length of one or more of 3 or 6; and receive, from the terminal device, a SRS signal using an OCC sequence from the one or more OCC sequences.
  • a terminal device may comprise receiving circuitry configured to receive, from a network device, sounding reference signal, SRS, configuration information indicating one or more orthogonal cover code, OCC, sequences in frequency domain, wherein the one or more OCC sequences have a length of one or more of 3 or 6; and transmitting circuitry configured to transmit, to the network device, a SRS signal using an OCC sequence from the one or more OCC sequences.
  • SRS sounding reference signal
  • OCC orthogonal cover code
  • the network device may comprise transmitting circuitry configured to transmit, to a terminal device, sounding reference signal, SRS, configuration information indicating one or more orthogonal cover code, OCC, sequences in frequency domain, wherein the one or more OCC sequences have a length of one or more of 3 or 6; and receiving circuitry configured to receive, from the terminal device, a SRS signal using an OCC sequence from the one or more OCC sequences.
  • SRS sounding reference signal
  • OCC orthogonal cover code
  • FIG. 1 illustrates an example network environment in which example embodiments of the present disclosure may be implemented
  • FIG. 2 illustrates an example flowchart of a method implemented at a terminal device according to example embodiments of the present disclosure
  • FIG. 3 illustrates an example flowchart of a method implemented at a network device according to example embodiments of the present disclosure
  • FIG. 4 illustrates an example signaling process for SRS enhancement according to some embodiments of the present disclosure
  • FIG. 5 A illustrates example correlations of baseline SRS sequences for 306 resource length of allocation
  • FIG. 5B illustrates example corelations of SRS sequences with OCC for 306 resource length of allocation
  • FIG. 6A illustrates example cubic metric (CM) for SRS symbol in comparison of prior art configuration and proposed OCC sequences
  • FIG. 6B illustrates example peak average power ratio (PAPR) for SRS symbol in comparison of prior art configuration and proposed OCC sequences
  • FIG. 7 illustrates an example simplified block diagram of a device that is suitable for implementing embodiments of the present disclosure.
  • FIG. 8 illustrates an example block diagram of an example computer readable medium in accordance with some embodiments of the present disclosure.
  • references in the present disclosure to “one embodiment,” “an embodiment,” “an example embodiment,” and the like indicate that the embodiment described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
  • first and second etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and similarly, a second element could be termed a first element, without departing from the scope of example embodiments. As used herein, the term “and/or” includes any and all combinations of one or more of the listed terms.
  • circuitry may refer to one or more or all of the following:
  • circuit(s) and or processor(s) such as a microprocessor(s) or a portion of a microprocessor(s), that requires software (e.g., firmware) for operation, but the software may not be present when it is not needed for operation.
  • software e.g., firmware
  • circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and/or firmware.
  • circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in server, a cellular network device, or other computing or network device.
  • the term “communication network” refers to a network following any suitable communication standards, such as Long Term Evolution (LTE), LTE- Advanced (LTE-A), Wideband Code Division Multiple Access (WCDMA), High-Speed Packet Access (HSPA), Narrow Band Internet of Things (NB-IoT) and so on.
  • LTE Long Term Evolution
  • LTE-A LTE- Advanced
  • WCDMA Wideband Code Division Multiple Access
  • HSPA High-Speed Packet Access
  • NB-IoT Narrow Band Internet of Things
  • the communications between a terminal device and a network device in the communication network may be performed according to any suitable generation communication protocols, including, but not limited to, the third generation (3G), the fourth generation (4G), 4.5G, the future fifth generation (5G) communication protocols, and/or any other protocols either currently known or to be developed in the future.
  • Embodiments of the present disclosure may be applied in various communication systems. Given the rapid development in communications, there will of course also be future type communication technologies and systems with which the present disclosure may be
  • the term “network device” refers to a node in a communication network via which a terminal device accesses the network and receives services therefrom.
  • the network device may refer to a base station (BS) or an access point (AP), for example, a node B (NodeB or NB), an evolved NodeB (eNodeB or eNB), a New Radio (NR) NB (also referred to as a gNB), a Remote Radio Unit (RRU), a radio header (RH), a remote radio head (RRH), a relay, a low power node such as a femto, a pico, and so forth, depending on the applied terminology and technology.
  • BS base station
  • AP access point
  • NodeB or NB node B
  • eNodeB or eNB evolved NodeB
  • NR New Radio
  • RRU Remote Radio Unit
  • RH radio header
  • RRH remote radio head
  • relay a low power node such as a f
  • terminal device refers to any end device that may be capable of wireless communication.
  • a terminal device may also be referred to as a communication device, user equipment (UE), a Subscriber Station (SS), a Portable Subscriber Station, a Mobile Station (MS), or an Access Terminal (AT).
  • UE user equipment
  • SS Subscriber Station
  • MS Mobile Station
  • AT Access Terminal
  • the terminal device may include, but not limited to, a mobile phone, a cellular phone, a smart phone, voice over IP (VoIP) phones, wireless local loop phones, a tablet, a wearable terminal device, a personal digital assistant (PDA), portable computers, desktop computer, image capture terminal devices such as digital cameras, gaming terminal devices, music storage and playback appliances, vehicle-mounted wireless terminal devices, wireless endpoints, mobile stations, laptop-embedded equipment (LEE), laptop-mounted equipment (LME), USB dongles, smart devices, wireless customer-premises equipment (CPE), an Internet of Things (loT) 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.
  • the terminal device
  • the 3GPP MIMO topic targets for SRS enhancement and it was already proposed to study or specify SRS enhancements to enable 8TX ULoperation to support 4 or more layers per UE in UL targeting for customer premises equipment (CPE)/fixed wireless access (FWA)/vehicle/industrial devices.
  • CPE customer premises equipment
  • FWA fixed wireless access
  • SRS resource set is configured where “srs-ResourceldList” defines SRS resource list, “resourceType defines triggering mechanism (aperiodic, semi-persistent, periodic)”, and “usage” is for configuration reason (beamManagement, codebook, nonCodebook antennaSwitching).
  • SRS resource are also configured, where “nrofSRS-Ports” defines 1, 2, or 4 ports, “transmissionComb” is used to define comb 2 and 4 with specific cyclic shift, “transmissionComb-n8-rl7” is used to define comb 8, “frequencyHopping” provides configuration information related to frequency hopping, “groupOrSequenceHopping” defines if grouping is defined for SRS allocation, and “resourceType” defines periodicity of allocation.
  • TD OCC for code division multiplexing may be applied to increase SRS antenna ports.
  • TD OCC sequences have a length of 2 or 4.
  • problems such as increased detection time of SRS antenna ports, repetition of UL SRS symbol over length of OCC, and etc.
  • SRS enhancement for supporting more SRS antenna ports by SRS, there is a need for improved solutions for SRS enhancement.
  • a terminal device receives, from a network device, sounding reference signal, SRS, configuration information.
  • the SRS configuration information may indicate one or more orthogonal cover code, OCC, sequences in frequency domain.
  • the one or more OCC sequences may have a length of one or more of 3 or 6.
  • the terminal device may transmit, to the network device, a SRS signal using an OCC sequence from the one or more OCC sequences.
  • this scheme may use FD OCC having a length of 3 or 6 for supporting more SRS antenna ports. For example, for the OCC having the length of 6 with the comb size of 2, the number of supported antenna ports will be increased by a factor of 6. In addition, it may also enable the increase of SRS antenna port with a better performance.
  • time domain (TD) OCC having a length of OCC lengths of 2 or 4.
  • the drawback lies in that detection time of SRS antenna port will be increased by delay of SRS transmission over the OCC sequence. Moreover, it requires a repetition of UL SRS symbol over the length of TD OCC. Furthermore, it creates a scheduling restriction for the network.
  • the OCC sequence is in frequency domain, it will not bring any increase in detection time of SRS antenna port. Meanwhile, it does not need repetition of UL SRS symbols over the length of TD OCC, and thus it will not cause scheduling restriction for the network, either.
  • the FD OCC sequences with lengths of 3 and/or 6 are longer than traditional OCC sequences . Therefore, compared with traditional OCC sequences with the length 2 or 4, the proposed OCC sequences may enable to add more resources into given resources, in this case more antenna ports.
  • the OCC sequences having the length of 3 may give one additional ports when compared to OCC sequences having a length of 2, and the OCC sequences having a length of 6 gives 2 additional ports compared to OCC sequences having a length of 4.
  • the length of 6 may fit better into SRS comb size of 2, since there are already 6 resource elements per physical resource block (PRB).
  • the length of 4 fails to support these 6 resources since the number of resource element of SRS transmission per PRB is not a multiple of 4.
  • only OCC can be fitted on 2 resource elements (REs), i.e., 4 ports less than with OCC sequences with the length of 4 supported.
  • FIG. 1 illustrates an example environment 100 in which example embodiments of the present disclosure can be implemented.
  • the environment 100 which may be a part of a communication network, comprises a terminal device 110 and a network device 120 communicating with each other or with other devices via each other.
  • the communication environment 100 may comprise any suitable number of devices and cells.
  • the terminal device 110 and the network device 120 can communicate data and control information with each other.
  • a link from the network device 120 to the terminal device 110 is referred to as a downlink (DL), while a link from the terminal device 110 to the network device 120 is referred to as an uplink (UL).
  • DL downlink
  • UL uplink
  • the environment 100 may comprise a further device to communicate with the terminal device 110 and network device 120.
  • the communications in the environment 100 may follow any suitable communication standards or protocols, which are already in existence or to be developed in the future, such as Universal Mobile Telecommunications System (UMTS), long term evolution (LTE), LTE-Advanced (LTE-A), the fifth generation (5G) New Radio (NR), Wireless Fidelity (Wi-Fi) and Worldwide Interoperability for Microwave Access (WiMAX) standards, and employs any suitable communication technologies, including, for example, Multiple-Input Multiple-Output (MIMO), Orthogonal Frequency Division Multiplexing (OFDM), time division multiplexing (TDM), frequency division multiplexing (FDM), code division multiplexing (CDM), Bluetooth, ZigBee, and machine type communication (MTC), enhanced mobile broadband (eMBB), massive machine type communication (mMTC), ultrareliable low latency communication (URLLC), Carrier Aggregation (CA), Dual Connectivity (DC), and New Radio Unlicensed (NR-U) technologies.
  • UMTS Universal Mobile Telecommunications System
  • LTE long term evolution
  • FIG. 2 illustrates an example flowchart of a method 200 implemented at a terminal device according to example embodiments of the present disclosure. For the purpose of discussion, the method 200 will be described from the perspective of the terminal device 110 with reference to FIG. 1.
  • the terminal device 110 may receive, from a network device 120, sounding reference signal, SRS, configuration information indicating one or more orthogonal cover code, OCC, sequences in frequency domain.
  • the one or more OCC sequences may have a length of one or more of 3 or 6.
  • the terminal device 110 may transmit, to the network device 120, a SRS signal using an OCC sequence from the one or more OCC sequences.
  • the SRS configuration information comprises one or more of length information of the one or more OCC sequences and OCC sequence starting information for the one or more OCC sequences.
  • the length information of the one or more OCC sequences and the OCC sequence starting information may be signaled together or separately from the network device 112 to the terminal device 110.
  • the SRS configuration information is comprised in a field in an SRS resource list. This filed could a new filed in the SRS resource list.
  • the SRS configuration information may be included in a new filed under SRS resource list as below.
  • occLength-rl8 may be 2bits and denote the length of OCC sequences
  • occStartingIndex-rl8 may be 4bits and denote the starting index of the OCC sequence information.
  • the SRS configuration information may comprise offset information on the one or more OCC sequences for a group of antenna ports.
  • the terminal device 110 may determine an OCC sequence from the one or more OCC sequences based on the offset information for the group of antenna ports.
  • the offset information may also be included in a new field under SRS-Resource list. Fox example, the offset information may be defined as follows: occOffset-n6-rl8 INTEGER (0..5).
  • the offset information (e.g. occOffset-n6-rl8) may be configured to a group of terminal devices for e.g. joint transmission purposes over multiple transmitters. By reserving specific offset(s) for this type of usage, OCC can be used for allocating specific resources for the group of terminal device.
  • the terminal device may determine an index of an OCC sequence from the one or more OCC sequences.
  • the index may be rotated based on one or more of an index of a timeslot for transmission of the SRS signal or identity of a cell (Cell ID).
  • Cell ID identity of a cell
  • Rotated or “rotation” refers to an operation of reording indexes. For example, for indxes 1, 2, 3 and 4, after rotation, the resulting indexes will be indexes 4, 3, 2, and 1.
  • the rotated index “occlndex” may be determined based on an equation as below.
  • occlndex mod(occOffset-n6-rl8 + slotindex, occ sequence length) where the parameter “occOffset-n6-rl8” denotes the above mentioned offset information, the parameter “slotindex” denotes the index of timeslot, and the parameter “occ sequence length” denotes the length of OCC sequences, which may be 3 or 6.
  • the length of the OCC sequence may be determined based on the size of SRS transmission comb for the terminal device. For example, rell8 SRS is signalled for the terminal device 110 by the network device 120 (e.g. gNB) in the SRS configuration information.
  • the length of OCC sequences may be selected based on configured SRS comb size.
  • the size of SRS transmission comb may indicate a density of subcarriers occupied by resource elements for the SRS sequence.
  • the length of the OCC sequence may be determined as 6 when a size of SRS transmission comb is 2. In this case, the OCC sequences cover one PRB. In some example embodiments, the length of the OCC sequence may be determined as 3 when a size of SRS transmission comb is 4. In this case the OCC sequences cover one PRB. In some example embodiments, the length of the OCC sequence may be determined as 3 when a size of SRS transmission comb is 8. In this case, the OCC sequences cover two PRBs.
  • Example scheme of OCC sequence length selection may be provided as follows only for illustrative purposes:
  • ⁇ comb 2 OCC length of 6 (covering one PRB)
  • ⁇ comb 4 OCC length of 3 (covering one PRB)
  • ⁇ comb 8 OCC length of 3 (covering two PRBs, currently comb 8 is not used for SRS channel measurements and is used for positioning measurements only).
  • number of ports can be increased up to 12 antenna ports by extending OCC over two adjacent PRBs starting from first allocated PRB. It may be advantageous that if eight antenna ports are only needed, and the remaining 4 antenna ports (any subset of given OCC sequences) may be reserved for future use.
  • the elements of the one or more OCC sequences may have a unit amplitude.
  • the one or more OCC sequence may be multiplied with any scalar value, which will not change properties of the OCC sequences.
  • the one or more OCC sequences with the length of 6 may comprise one or more of:
  • the first sequence is an all-one sequence and may be regarded as a baseline sequence.
  • the baseline sequence may be used for detecting and/or enabling multiplexing of legacy UL SRS with Rel-18 UL SRS.
  • the third, the forth, and the fifth sequences may be derived from the second one.
  • the third sequence may be an inverse version of the second sequence.
  • the fourth sequence may be obtained by multiplying a shifted version (cyclic shifted to left by 1) of the second sequence with a predetermined sequence, for example, [1, -1, 1, -1, 1, -1].
  • the one or more OCC sequences with the length of 3 may be derived from the above six OCC sequences of the length of 6, for example, the first three elements from three of the six OCC sequences.
  • the one or more OCC sequences with the length of 3 may comprise one or more of:
  • the number of antenna ports can be extended substantially.
  • the SRS comb size of 2 there exist two resource sets per PRB.
  • a preferable way to map e.g. 8 antenna ports for these resources is to allocate 4 antenna ports per comb set as below.
  • Comb set with RE offset 0 include antenna ports 1000 tol003, and Comb set with RE offset 1 include antenna ports 1004 to 1007, or
  • Comb set with RE offset 0 include antenna ports 1000, 1002, 1004 and 1006, and Comb set with RE offset 1 include antenna ports 1001, 1003, 1005 and 1007. [0075]
  • the number of antenna ports may be increased by 6 times at maximum.
  • the detection time of the OCC sequence is not increased (interference is increased as expected like with any multi sequence transmission towards sequences which are non-orthogonal at SRS reception/detection time). For the length of 3 OCC code similar advantages can be seen.
  • the SRS interference might increase in SRS detection due to additional SRS antenna ports.
  • the legacy solution has 30*8*2 sequences for comb 2, now it is possible to have 30*8*2*6 sequences according to proposed solution.
  • Additional transmitting ports may be allocated with utilizing channel information for given environment, which may increase the cell capacity. Therefore, despite the increase of SRS interference, overall throughput will be increased due to increased measurement capacity for SRS antenna ports.
  • Same sequence definition of OCC length 6 and/or 3 may be used for DL or UL DMRS purposes.
  • For UL receiver implementation can utilize same knowledge of allocated new SRS sequences to detect previous versions of SRS sequences when allocated into same resources in time and frequency (referring to previously mentioned OCC removal and detection of previous versions of SRS sequences).
  • the OCC sequence length or OCC sequence offset can be indicated to UE dynamically with DO (e.g. format l_0, format 1_1, etc.) configuration together with DMRS configuration.
  • DO e.g. format l_0, format 1_1, etc.
  • FIG. 3 illustrates an example flowchart of a method 300 implemented at a network device according to example embodiments of the present disclosure.
  • the method 200 will be described from the perspective of the network device 120 with reference to FIGs. 1 and 2.
  • the network device 120 may transmit, to a terminal device 110, sounding reference signal, SRS, configuration information indicating one or more orthogonal cover code, OCC, sequences in frequency domain
  • SRS sounding reference signal
  • OCC orthogonal cover code
  • the one or more OCC sequences may have a length of one or more of 3 or 6.
  • the network device 120 may receive, from the terminal device 110, a SRS signal using an OCC sequence from the one or more OCC sequence.
  • the SRS configuration information may comprise one or more of length information of the one or more OCC sequences and OCC sequence starting information for the one or more OCC sequences.
  • the SRS configuration information may be comprised in a field in an SRS resource list.
  • the SRS configuration information may comprise offset information on the one or more OCC sequences for a group of antenna ports, and wherein the OCC sequence from the one or more OCC sequences is determined based on the offset information for the group of antenna ports.
  • the one or more OCC sequences with the length of 6 may comprise one or more of:
  • the first sequence may be regarded as a baseline sequence which may be is used for detecting and/or enabling multiplexing of legacy UL SRS with Rel- 18 UL SRS.
  • the network device 120 may use this baseline OCC sequence together with earlier release SRS sequence, then all signal sequences may be treated with OCC detection where resource elements covered with OCC are averaged (or summed up) to form single sample over OCC resources. Resulted sample can be used for SRS measurement and can be up- sampled according to an intended sampling rate (e.g. by a repeater, filter, i.e. a finite impulse response filter)
  • an intended sampling rate e.g. by a repeater, filter, i.e. a finite impulse response filter
  • the third, the forth, and the fifth sequences may be derived from the second one.
  • the one or more OCC sequences with the length of 3 may comprise one or more of:
  • an index of the OCC sequence from the one or more OCC sequences is rotated based on one or more of an of a timeslot for transmission of the SRS signal or identity of a cell.
  • the length of the OCC sequence may be determined based on a size of SRS transmission comb for the terminal device.
  • the size of SRS transmission comb may indicate a density of subcarriers occupied by resource elements for the SRS sequence.
  • the length of the OCC sequence may be determined as 6 when a size of SRS transmission comb is 2. In some example embodiments, the length of the OCC sequence may be determined as 3 when a size of SRS transmission comb is 4. In some example embodiments, the length of the OCC sequence may be determined as 3 when a size of SRS transmission comb is 8.
  • FIG. 4 illustrates an example signaling process for SRS enhancement according to some embodiments of the present disclosure.
  • the process 400 will be described with reference to Figs. 1 to 3.
  • the process 400 may involve the terminal device 110 and network devices 120 as illustrated in Fig. 1. It would be appreciated that although the process 400 has been described in the communication environment 100 of Fig. 1, this process may be likewise applied to other communication scenarios with similar issues.
  • the terminal device 110 receives, from a network device, sounding reference signal, SRS, configuration information indicating one or more orthogonal cover code, OCC, sequences in frequency domain, wherein the one or more OCC sequences have a length of one or more of 3 or 6.
  • SRS configuration information is comprised in a field in an SRS resource list.
  • the SRS configuration information may comprise one or more of length information of the one or more OCC sequences and OCC sequence starting information for the one or more OCC sequences.
  • the SRS configuration information may further comprises offset information on the one or more OCC sequences for a group of antenna ports.
  • the terminal device 110 may use the offset information for the group of antenna ports to determine a sequence from the one or more OCC sequences.
  • the one or more OCC sequences with the length of 6 may comprise
  • the one or more OCC sequences with the length of 3 may comprise;
  • the length of the OCC sequence may be determined based on a size of SRS transmission comb for the terminal device. For example, the length of the OCC sequence is determined as 6 when a size of SRS transmission comb is 2; and/or the length of the OCC sequence is determined as 3 when a size of SRS transmission comb is 4; and/or the length of the OCC sequence is determined as 3 when a size of SRS transmission comb is 8.
  • the size of SRS transmission comb may indicate a density of subcarriers occupied by resource elements for the SRS sequence.
  • the terminal device 110 may transmit acknowledge message to the network device 120.
  • the network device 120 is aware that the terminal device 110 has been successfully configured by the SRS configuration information at 401.
  • the terminal device 110 transmits, to the network device 120, a SRS signal using an OCC sequence from the one or more OCC sequences.
  • the terminal device 110 may determine an index of an OCC sequence to use with the SRS signal.
  • the index of the OCC sequence from the one or more OCC sequences is rotated based on one or more of an index of a timeslot for transmission of the SRS signal or identity of a cell. For example, let occlndex denotes the index, it may be determined based on an equation as below.
  • occlndex mod(occOffset-n6-rl8 + slotindex, occ sequence length)
  • the parameter “occOffset-n6-rl8” denotes the above mentioned offset information
  • the parameter “slotindex” denotes the index of timeslot
  • the parameter “occ sequence length” denotes the length of OCC sequences, which may be 3 or 6.
  • FIG. 5A to FIG. 6 illustrates some simulation results regarding to the solution as proposed herein.
  • FIG. 5A illustrates correlations of baseline SRS sequences without the OCC sequences as proposed herein for 306 resource length of allocation
  • Fig. 5B illustrates correlations of baseline SRS sequences with the OCC sequences as proposed herein for 306 resource length of allocation.
  • a left figure shows correlation of correct codes
  • a right figure shows correlations of incorrect sequences. From the simulation results, it is seen that the sequences space may substantially increase, for example, by nearly a factor of 6, when using proposed OCC sequences of length 6, as illustrated by the central dark parts in two right figures in Fig. 5 A and Fig. 5B. Meanwhile the proposed OCC sequences may still maintain the good correlations.
  • FIG. 6A and FIG. 6B respectively illustrate cubic metric (CM) and peak average power ratio (PAPR) for SRS symbol in comparison of prior art configuration and proposed OCC sequences.
  • dashed lines represents prior art configuration and solid lines represents proposed OCC sequences. From FIG. 6A and FIG. 6B, it is seen that the solution proposed in the present dislsoure may achieve a comparable CM performance and also PAPR while supporting a large number of SRS antenna ports.
  • FIG. 7 is a simplified block diagram of a device 700 that is suitable for implementing embodiments of the present disclosure.
  • the device 700 may be provided to implement the communication device, for example the terminal device 110 or the network device 120 as shown in FIG. 1.
  • the device 700 includes one or more processors 710, one or more memories 740 coupled to the processor 710, and one or more transmitters and/or receivers (TX/RX) 740 coupled to the processor 710.
  • TX/RX transmitters and/or receivers
  • the TX/RX 740 is for bidirectional communications.
  • the TX/RX 740 has at least one antenna to facilitate communication.
  • the communication interface may represent any interface that is necessary for communication with other network elements.
  • the processor 710 may be of any type suitable to the local technical network and may include one or more of the following: general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples.
  • the device 700 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.
  • the memory 720 may include one or more non-volatile memories and one or more volatile memories.
  • the non-volatile memories include, but are not limited to, a read only memory (ROM) 724, an electrically programmable read only memory (EPROM), a flash memory, a hard disk, a compact disc (CD), a digital video disk (DVD), and other magnetic storage and/or optical storage.
  • the volatile memories include, but are not limited to, a random access memory (RAM) 722 and other volatile memories that will not last in the power-down duration.
  • a computer program 730 includes computer executable instructions that are executed by the associated processor 710.
  • the program 730 may be stored in the ROM 724.
  • the processor 710 may perform any suitable actions and processing by loading the program 730 into the RAM 722.
  • the embodiments of the present disclosure may be implemented by means of the program so that the device 700 may perform any process of the disclosure as discussed with reference to FIGs. 2 to 4.
  • the embodiments of the present disclosure may also be implemented by hardware or by a combination of software and hardware.
  • the program 730 may be tangibly contained in a computer readable medium which may be included in the device 700 (such as in the memory 720) or other storage devices that are accessible by the device 700.
  • the device 700 may load the program 730 from the computer readable medium to the RAM 722 for execution.
  • the computer readable medium may include any types of tangible non-volatile storage, such as ROM, EPROM, a flash memory, a hard disk, CD, DVD, and the like.
  • FIG. 8 shows an example of the computer readable medium 800 in form of CD or DVD.
  • the computer readable medium has the program 730 stored thereon.
  • various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While various aspects of embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representations, it is to be understood that the block, apparatus, system, technique or method described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • the present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer readable storage medium.
  • the computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor, to carry out the method 200, 300, or process 400 as described above with reference to FIG. 2, FIG. 3 and FIG. 4.
  • program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types.
  • the functionality of the program modules may be combined or split between program modules as desired in various embodiments.
  • Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.
  • Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions/operations specified in the flowcharts and/or block diagrams to be implemented.
  • the program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
  • the computer program codes or related data may be carried by any suitable carrier to enable the device, apparatus or processor to perform various processes and operations as described above.
  • Examples of the carrier include a signal, computer readable medium, and the like.
  • the computer readable medium may be a computer readable signal medium or a computer readable storage medium.
  • a computer readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the computer readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD- ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
  • the term “non-transitory,” as used herein, is a limitation of the medium itself (i.e., tangible, not a signal) as opposed to a limitation on data storage persistency (e.g., RAM vs. ROM).

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

Abstract

Des modes de réalisation de la présente divulgation concernent des dispositifs, des procédés et des appareils pour des améliorations de SRS. Un dispositif terminal reçoit, en provenance d'un dispositif de réseau, des informations de configuration de signal de référence de sondage, SRS, indiquant un ou plusieurs séquences de code de couverture orthogonal, OCC, dans le domaine fréquentiel, lesdites une ou plusieurs séquences OCC présentant une longueur d'une ou de plusieurs longueurs de 3 ou 6. Le dispositif terminal transmet en outre, au dispositif de réseau, un signal SRS à l'aide d'une séquence OCC provenant desdites une ou plusieurs séquences OCC.
PCT/IB2023/059813 2022-09-30 2023-09-29 Dispositifs, procédés et appareils d'amélioration de srs WO2024069591A1 (fr)

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EP4009688A1 (fr) * 2019-08-02 2022-06-08 Ntt Docomo, Inc. Terminal et procédé de communication sans fil

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EP4009688A1 (fr) * 2019-08-02 2022-06-08 Ntt Docomo, Inc. Terminal et procédé de communication sans fil

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