[go: up one dir, main page]

WO2024229737A1 - Saut de fréquence de signal de référence - Google Patents

Saut de fréquence de signal de référence Download PDF

Info

Publication number
WO2024229737A1
WO2024229737A1 PCT/CN2023/093208 CN2023093208W WO2024229737A1 WO 2024229737 A1 WO2024229737 A1 WO 2024229737A1 CN 2023093208 W CN2023093208 W CN 2023093208W WO 2024229737 A1 WO2024229737 A1 WO 2024229737A1
Authority
WO
WIPO (PCT)
Prior art keywords
reference signal
papr
frequency
sequence
signal sequence
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/CN2023/093208
Other languages
English (en)
Inventor
Hyun-Su Cha
Ryan Keating
Tao Tao
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.)
Nokia Shanghai Bell Co Ltd
Nokia Solutions and Networks Oy
Nokia Technologies Oy
Original Assignee
Nokia Shanghai Bell Co Ltd
Nokia Solutions and Networks Oy
Nokia Technologies Oy
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 Nokia Shanghai Bell Co Ltd, Nokia Solutions and Networks Oy, Nokia Technologies Oy filed Critical Nokia Shanghai Bell Co Ltd
Priority to PCT/CN2023/093208 priority Critical patent/WO2024229737A1/fr
Priority to CN202380098111.8A priority patent/CN121153220A/zh
Publication of WO2024229737A1 publication Critical patent/WO2024229737A1/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

Links

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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • H04L5/0012—Hopping in multicarrier systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/0205—Details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/0205—Details
    • G01S5/0236—Assistance data, e.g. base station almanac
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • 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
    • H04L27/2614—Peak power aspects
    • 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
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/0055—ZCZ [zero correlation zone]
    • H04J13/0059—CAZAC [constant-amplitude and zero auto-correlation]
    • H04J13/0062—Zadoff-Chu

Definitions

  • Various example embodiments of the present disclosure generally relate to the field of telecommunication and in particular, to methods, devices, apparatuses and computer readable storage medium for frequency hopping of a reference signal (RS) .
  • RS reference signal
  • New Radio (NR) positioning in Release 18 (Rel-18) supports Reduced Capability (RedCap) UE positioning.
  • RedCap Reduced Capability
  • For high accuracy of the RedCap UE positioning frequency hopping beyond the maximum RedCap UE bandwidth is introduced for reception of a downlink (DL) positioning reference signal (PRS) and transmission of an uplink (UL) sounding reference signal (SRS) for positioning.
  • DL downlink
  • UL uplink
  • SRS frequency hopping a configuration is that each SRS frequency hop corresponds to a Zadoff-Chu (ZC) sequence.
  • ZC Zadoff-Chu
  • a receiver may receive four different ZC sequences, in case the receiver performs coherent combining of the received SRSs over the four frequency hops to measure a timing measurement from wideband SRSs.
  • Another configuration is using a single long ZC sequence for the SRS frequency hops, and each SRS frequency hop may comprise a part of a ZC sequence, which may cause a peak to average power ratio (PAPR
  • a method at a first device receives, from a second device, at least one configuration for frequency hopping of a reference signal.
  • the at least one configuration includes information on at least a first reference signal sequence.
  • the first device transmits a message requesting for a second reference signal sequence.
  • a method at a second device transmits, to a first device, at least one configuration for frequency hopping of a reference signal.
  • the at least one configuration includes information on at least a first reference signal sequence.
  • the second device receives, from the first device, a message requesting for a second reference signal sequence.
  • the third device receives, from a second device, at least one configuration for frequency hopping of a reference signal to be transmitted by a first device, the at least one configuration including information on at least a first reference signal sequence.
  • the third device receives, from the first device, a message requesting for a second reference signal sequence.
  • a first device comprises at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the first device at least to: receive, from a second device, at least one configuration for frequency hopping of a reference signal, the at least one configuration including information on at least a first reference signal sequence; and based on a determination that a condition related to a PAPR at one or more frequency hops is unsatisfied by the first reference signal sequence, transmit a message requesting for a second reference signal sequence.
  • a second device comprises at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the second device at least to: transmit, to a first device, at least one configuration for frequency hopping of a reference signal, the at least one configuration including information on at least a first reference signal sequence; and receive, from the first device, a message requesting for a second reference signal sequence.
  • a third device comprising at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the third device at least to: receive, from a second device, at least one configuration for frequency hopping of a reference signal to be transmitted by a first device, the at least one configuration including information on at least a first reference signal sequence; and receive, from the first device, a message requesting for a second reference signal sequence.
  • a first apparatus comprises means for receiving, from a second device, at least one configuration for frequency hopping of a reference signal, the at least one configuration including information on at least a first reference signal sequence; and means for based on a determination that a condition related to a peak to average power ratio (PAPR) at one or more frequency hops is unsatisfied by the first reference signal sequence, transmitting a message requesting for a second reference signal sequence.
  • PAPR peak to average power ratio
  • a second apparatus comprises means for transmitting, to a first device, at least one configuration for frequency hopping of a reference signal, the at least one configuration including information on at least a first reference signal sequence; and means for receiving, from the first device, a message requesting for a second reference signal sequence.
  • a third apparatus comprises means for receiving, from a second device, at least one configuration for frequency hopping of a reference signal to be transmitted by a first device, the at least one configuration including information on at least a first reference signal sequence; and means for receiving, from the first device, a message requesting for a second reference signal sequence.
  • a computer readable medium comprises instructions stored thereon for causing an apparatus to perform at least the method according to the first or second aspect.
  • FIG. 1A illustrates an example communication environment in which example embodiments of the present disclosure can be implemented
  • FIG. 1B illustrates an example frequency hopping process
  • FIG. 1C illustrates an example of configurations for SRS frequency hopping within an SRS resource
  • FIG. 2 illustrates a signaling diagram for an example communication process in the communication environment according to some example embodiments of the present disclosure
  • FIG. 3 illustrates an example process of RS frequency hopping in accordance with some example embodiments of the present disclosure
  • FIG. 4 illustrates another example process of RS frequency hopping in accordance with some other example embodiments of the present disclosure
  • FIG. 5 illustrates a further example process of RS frequency hopping in accordance with yet some other example embodiments of the present disclosure
  • FIG. 6 illustrates a flowchart of a method implemented at a first device according to some example embodiments of the present disclosure
  • FIG. 7 illustrates a flowchart of a method implemented at a second device according to some example embodiments of the present disclosure
  • FIG. 8 illustrates a flowchart of a method implemented at a third device according to some example embodiments of the present disclosure
  • FIG. 9 illustrates a simplified block diagram of a device that is suitable for implementing example embodiments of the present disclosure.
  • FIG. 10 illustrates a block diagram of an example computer readable medium in accordance with some example 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, ” “second” and the like 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.
  • the term “and/or” includes any and all combinations of one or more of the listed terms.
  • performing a step “in response to A” does not indicate that the step is performed immediately after “A” occurs and one or more intervening steps may be included.
  • circuitry may refer to one or more or all of the following:
  • 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 New Radio (NR) , 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.
  • NR New Radio
  • 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 first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) communication protocols, and/or any other protocols either currently known or to be developed in the future.
  • suitable generation communication protocols including, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the 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 embodied. It should not be seen as limiting the scope of the present disclosure to only the aforementioned system
  • 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) , an NR NB (also referred to as a gNB) , a Remote Radio Unit (RRU) , a radio header (RH) , a remote radio head (RRH) , a relay, an Integrated Access and Backhaul (IAB) node, a low power node such as a femto, a pico, a non-terrestrial network (NTN) or non-ground network device such as a satellite network device, a low earth orbit (LEO) satellite and a geosynchronous earth orbit (GEO) satellite, an aircraft network device, and so forth, depending on the applied terminology and technology
  • radio access network (RAN) split architecture comprises a Centralized Unit (CU) and a Distributed Unit (DU) at an IAB donor node.
  • An IAB node comprises a Mobile Terminal (IAB-MT) part that behaves like a UE toward the parent node, and a DU part of an IAB node behaves like a base station toward the next-hop IAB node.
  • IAB-MT Mobile Terminal
  • 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 (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/
  • the terminal device may also correspond to a Mobile Termination (MT) part of an IAB node (e.g., a relay node) .
  • MT Mobile Termination
  • IAB node e.g., a relay node
  • the terms “terminal device” , “communication device” , “terminal” , “user equipment” and “UE” may be used interchangeably.
  • resource may refer to any resource for performing a communication, for example, a communication between a terminal device and a network device, such as a resource in time domain, a resource in frequency domain, a resource in space domain, a resource in code domain, or any other resource enabling a communication, and the like.
  • a resource in both frequency domain and time domain will be used as an example of a transmission resource for describing some example embodiments of the present disclosure. It is noted that example embodiments of the present disclosure are equally applicable to other resources in other domains.
  • Rel-18 NR positioning supports RedCap UE positioning. For example, frequency hopping beyond the maximum RedCap UE bandwidth may be supported for reception of a DL PRS and transmission of a UL SRS for positioning. Moreover, radio resource management (RRM) requirements for positioning may be needed, which includes RRM measurements and procedures for RedCap UEs for both with and without frequency hopping. The complexity of the corresponding capabilities for RedCap UEs needs to be addressed for the introduction of appropriate capabilities for RedCap UEs.
  • RRM radio resource management
  • RedCap UEs For RedCap UEs, at least measurements on DL PRS with receiving (Rx) frequency hopping using a measurement gap are supported. The following is for further study: details on RedCap UE processing capabilities for DL PRS with Rx frequency hopping and a measurement gap (MG) , the use of single or multiple instances of MGs, and the use of PRS processing window (PPW) .
  • the scope for RedCap positioning includes frequency range 1 (FR1) and frequency range 2 (FR2) .
  • a short switching time to allow radio frequency (RF) retuning between adjacent hops may be beneficial in terms of accuracy and latency performance.
  • a location service (LS) may be sent to a radio access network (RAN) to request feedback on the feasible values for the switching time between hops, for example, when numerology and bandwidth for each hop can be the same, and the Tx and Rx antennas used in all hops can be the same.
  • the UE may hop within a DL PRS resource.
  • SRS positioning frequency hopping may be supported by using a configuration separate from the existing bandwidth part (BWP) configuration.
  • Hopping may be configured within an SRS resource or across SRS resources.
  • SRS-Pos SRS for positioning
  • RRC radio resource control
  • each SRS frequency hop comprises a Zadoff-Chu (ZC) sequence. If four SRS frequency hops are assumed, the receiver or the gNB may receive four different ZC sequences.
  • ZC Zadoff-Chu
  • a proposed SRS configuration approach uses a single long ZC sequence with SRS frequency hopping so that a receiver can see a single sequence.
  • the ZC sequence exhibits good cross-correlation property as it is an orthogonal sequence, and it inherently possesses a low PAPR property as the ZC sequence is constant envelop signals, which obviates a high PAPR issue for the transmission of the SRS.
  • the low PAPR property of the ZC sequence may not be preserved when transmitting only a part of the ZC sequence.
  • Example embodiments of the present disclosure propose a scheme to reduce a PAPR during a transmission of reference signal (RS) frequency hops.
  • RS reference signal
  • FIG. 1A illustrates an example communication environment 100 in which example embodiments of the present disclosure can be implemented.
  • a first device 110 and a second device 120 can communicate with each other.
  • the first device 110 may be a terminal device which may be a RedCap UE.
  • the second device 120 may be a network device such as a gNB.
  • some example embodiments are described with the first device 110 operating as a terminal device and the second device 120 operating as a network device.
  • operations described in connection with a terminal device may be implemented at a network device or other device, and operations described in connection with a network device may be implemented at a terminal device or another device.
  • a link from the second device 120 to the first device 110 is referred to as a downlink (DL)
  • a link from the first device 110 to the second device 120 is referred to as an uplink (UL)
  • the second device 120 is a transmitting (TX) device (or a transmitter)
  • the first device 110 is a receiving (RX) device (or a receiver)
  • the first device 110 is a TX device (or a transmitter) and the second device 120 is a RX device (or a receiver) .
  • SL sidelink
  • one of the first and second devices 110 and 120 is a TX device (or a transmitter)
  • the other of the first and second devices 110 and 120 is a RX device (or a receiver) .
  • the environment 100 further includes a third device 130 which may operate a location device such as an LMF that provides positioning-related services to the first device 110.
  • the third device 120 can communicate with the first and second devices 110 and 120.
  • the third device 130 may communicate with the first device 110 using an LTE positioning protocol (LPP) .
  • LTP LTE positioning protocol
  • the communication between the first device 110 and the third device 120 may be forwarded by the second device 120 or transparent to the second device 120.
  • the third device 130 is shown to be physically separate from the second device 120 only for the purpose of illustration, without suggesting any limitation.
  • the third device 130 may be implemented by a physical or virtual device.
  • the third device 130 may be implemented as a hardware, firmware, and/or algorithm-based software component within any of the network nodes (such as the terminal device, the base station, and/or the like) .
  • the third device 130 may be physically integrated into or implemented as a part of the second device 120.
  • the third device 130 may be at least partially implemented as a network function of a core network, and/or the like.
  • Communications in the communication environment 100 may be implemented according to any proper communication protocol (s) , comprising, but not limited to, cellular communication protocols of the first generation (1G) , the second generation (2G) , the third generation (3G) , the fourth generation (4G) , the fifth generation (5G) , the sixth generation (6G) , and the like, wireless local network communication protocols such as Institute for Electrical and Electronics Engineers (IEEE) 802.11 and the like, and/or any other protocols currently known or to be developed in the future.
  • s cellular communication protocols of the first generation (1G) , the second generation (2G) , the third generation (3G) , the fourth generation (4G) , the fifth generation (5G) , the sixth generation (6G) , and the like
  • wireless local network communication protocols such as Institute for Electrical and Electronics Engineers (IEEE) 802.11 and the like, and/or any other protocols currently known or to be developed in the future.
  • the communication may utilize any proper wireless communication technology, comprising but not limited to: Code Division Multiple Access (CDMA) , Frequency Division Multiple Access (FDMA) , Time Division Multiple Access (TDMA) , Frequency Division Duplex (FDD) , Time Division Duplex (TDD) , Multiple-Input Multiple-Output (MIMO) , Orthogonal Frequency Division Multiple (OFDM) , Discrete Fourier Transform spread OFDM (DFT-s-OFDM) and/or any other technologies currently known or to be developed in the future.
  • CDMA Code Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • MIMO Multiple-Input Multiple-Output
  • OFDM Orthogonal Frequency Division Multiple
  • DFT-s-OFDM Discrete Fourier Transform spread OFDM
  • the frequency hopping operation is applied in RS transmissions, for example, for the positioning purposes.
  • the RS may comprise a DL PRS, a sidelink PRS, or an UL SRS. It is to be understood that the number of devices and their connections shown in FIG. 1A are only for the purpose of illustration without suggesting any limitation.
  • the communication environment 100 may include any suitable number of devices configured to implement example embodiments of the present disclosure. Although not shown, it would be appreciated that one or more additional devices may be deployed in the communication environment 100 which can receive the RS from the first device 110, for example, for the positioning purposes.
  • a virtual resource configuration may be used for the RS.
  • a virtual BWP may be configured with a large physical BWP which may exceed the maximum bandwidth allowed by the capability of the first device 110 such as a RedCap UE.
  • the virtual RS configuration is to configure RS resources over a large bandwidth beyond the UE capability on the maximum bandwidth or bandwidth part size.
  • the RS is an SRS.
  • the SRS may be an SRS configured for MIMO (Multiple Input Multiple Output) operation such as channel state information acquisition, antenna switching, and beam management.
  • the SRS may an SRS configured for positioning purpose.
  • FIG. 1B illustrates an example frequency hopping process.
  • the SRS frequency hop 140 is transmitted within the UL active BWP 135, while other two SRS frequency hops 145 and 150 are transmitted outside of the active BWP 135.
  • Two different SRS frequency hops have overlapped resource block (s) so that the receiver can measure a phase offset or phase discontinuity, where the phase discontinuity is generated as the first device may not be able to keep a constant phase for the SRS transmission over multiple frequency hops.
  • resource blocks 155 of the SRS frequency hop 140 overlap with resource blocks 160 of the SRS frequency hop 145.
  • the SRS frequency hop 145 and the SRS frequency hop 150 are also overlapped.
  • the first device 110 After a transmission of an SRS frequency hop, the first device 110 needs a gap time to perform an RF switching.
  • the compensation for the phase difference is needed for the second device 120 to perform a coherent combining over the three SRS frequency hops.
  • the receiver such as the second device 120 can obtain positioning measurements from a wide-band SRS by stitching the frequency hops and the coherent combining to obtain a positioning measurement, thereby providing high-accuracy of positioning for the RedCap UEs.
  • the first device 110 may use a single long ZC sequence for the RS frequency hopping.
  • An example of such a RS configuration will be described below with reference to FIG. 1C where an SRS is transmitted.
  • FIG. 1C illustrates an example of configurations for SRS frequency hopping within an SRS resource.
  • This example of configurations for SRS frequency hopping may include at least information on the locations of SRS frequency hops and an SRS resource 165 with a generated long ZC sequence.
  • SRS frequency hops include a SRS frequency hop 170, a SRS frequency hop 175, and a SRS frequency hop 180.
  • the SRS resource 165 with a generated long ZC sequence may be allocated to the SRS frequency hops, and a part of ZC sequence may be allocated to its corresponding SRS frequency hop.
  • a first part of ZC sequence 172 may be allocated to the SRS frequency hop 170
  • a second part of ZC sequence 177 may be allocated to the SRS frequency hop 177
  • a third part of ZC sequence 182 may be allocated to the SRS frequency hop 180.
  • the first device 110 transmits a part of the ZC sequence when the first device 110 transmits each SRS frequency hop.
  • a RS sequence referred to as a first RS sequence
  • the first device 110 can request another RS sequence (referred to as a second RS sequence) than can satisfy the condition.
  • FIG. 2 illustrates a signaling diagram for an example communication process 200 among the first device 110, the second device 120, and the third device 130 in the communication scenario 100 according to some example embodiments of the present disclosure.
  • the second device 120 may transmit (205) at least one configuration for frequency hopping of a reference signal to the first device 110.
  • the first device 110 may receive the at least one configuration for frequency hopping of the reference signal from the second device 120.
  • the reference signal may be an SRS for positioning.
  • the at least one configuration may include information on at least a first reference signal sequence.
  • the first reference signal sequence may serve as a first SRS sequence provided by the second device 120 for the first device 110 to use for SRS frequency hopping.
  • the at least one configuration that the second device 120 provides to the first device 110 may comprise a configuration that at least contains information on the number of SRS frequency hops, identities of frequency hops, the time-domain and frequency-domain resource (s) of each SRS frequency hop, sequence mapping from a virtual SRS resource to each SRS frequency hop.
  • the first device 110 may perform the SRS frequency hopping based on the configuration.
  • the second device 120 may also transmit (210) to the third device 130 the at least one configuration for the frequency hopping of the reference signal to be transmitted by the first device 110. Accordingly, the third device 130 may receive from the second device 120 the at least one configuration for frequency hopping of a reference signal to be transmitted by the first device 110. In some example embodiments, the third device 130 may provide other network devices such as neighbor network device (s) with the at least one configuration for the frequency hopping provided by the second device 120. Other network devices may provide a neighbor cell of the serving cell provided by the second device 120.
  • neighbor network device s
  • the second device 120 may transmit (215) at least one allowable signal distortion level (also referred to as a tolerant signal distortion level) of at least one receiver of the reference signal to the first device 110, and then the first device 110 may receive the at least one allowable signal distortion level.
  • the tolerant signal distortion level may indicate the information on the tolerant or acceptable level of the signal distortion.
  • the second device 120 may provide the first device 110 via RRC signaling with the tolerant signal distortion level on SRS transmission over frequency hops. For example, this tolerant signal distortion level may be included in a part of the RRC configuration signaling for SRS frequency hopping.
  • the at least one tolerant signal distortion level may comprise a plurality of tolerant signal distortion levels of a plurality of receivers of the RS.
  • the tolerant signal distortion level of the multiple tolerant signal distortion levels may be indicated per receiver.
  • the tolerant signal distortion level and the at least one configuration for the frequency hopping may be transmitted from the second device 120 to the first device 110 in one signaling message.
  • the tolerant signal distortion level may be determined by the second device 120 based on a received signal strength of the at least one receiver, approximated distance between the first device 110 and the at least one receiver, and/or required measurement accuracy of the at least one receiver.
  • the receiver may be a transmission reception point (TRP) or a gNB. In some cases, if a TRP may perform measurements in a relatively accurate way as the first device 110 is closer to the TRP, the TRP may be somewhat tolerant to the signal distortion.
  • different receivers may allow different tolerant signal distortion levels.
  • the second device 120 may provide the first device 110 with a tolerant level of signal distortion per gNB or per TRP.
  • the tolerant signal distortion level may be transmitted by the third device 130 to the first device 110.
  • the third device 130 may collect the information on different receivers (such as neighbor gNBs and TRPs) of the RS. Based on such information as the received signal strength, approximated distance between the first device 110 and receivers, required accuracy, and so forth, the third device 130 may determine tolerant signal distortion levels of the receivers.
  • the first device 110 may determine (220) whether a condition related to a PAPR is satisfied by the first reference signal sequence.
  • the satisfaction of the conditional may be determined by comparing a PAPR associated with the first RS sequence with a threshold PARP.
  • the first device 110 may determine whether the PAPR associated with the first reference signal sequence is greater than a threshold PAPR at one or more frequency hops.
  • the number of frequency hops for condition determination may be defined depending on actual needs or network deployment.
  • the condition may be determined to be unsatisfied if the PAPRs at all the frequency hops is greater than the threshold PAPR.
  • the condition may be unsatisfied in the PAPRs at a predetermined number of frequency hops is greater. In an example, the predetermined number may be one. In other words, only if the PAPRs at all the frequency hops is equal to or smaller than the threshold PAPR, the condition is determined to be satisfied.
  • one or more threshold PAPRs may be used. At least one threshold PAPR (the threshold value of the threshold PAPR may be referred to as ⁇ 0 ) may be determined by the first device 110 based on at least one of: a power amplifier capability of the first device 110 or at least one allowable signal distortion level of at least one receiver of the reference signal.
  • the power amplifier capability may include a dynamic range of the first device 110.
  • the first device 110 may be equipped with a power amplifier that has 3dB dynamic range. In this example, if the PAPR of the transmission signal exceeds 3dB, the transmission signal is distorted by nonlinearity of the power amplifier. Thus, ⁇ 0 may be determined to be 3dB.
  • different devices may have different power amplifiers with different performance of dynamic range.
  • the threshold value ⁇ 0 may be different depending on different devices such as different UEs.
  • the threshold value ⁇ 0 used by the first device 110 may be different from the threshold value used by another device which has a different power amplifier capability.
  • the first device 110 determines a threshold value ( ⁇ 0 ) of the threshold PAPR (or “a threshold value of PAPR” ) based on its power amplifier capability and the provided tolerant level of the signal distortion. In some example embodiments, if the first device 110 is provided with a different tolerant level of signal distortion for each target cell or gNB, the first device 110 may determine a threshold value ( ⁇ 0, l, ) of PAPR for each l-th TRP or l-th cell where l ⁇ ⁇ 1, 2, ..., K ⁇ , based on its power amplifier capability and the provided tolerant level of the signal distortion.
  • the first device 110 may take into account a provided TRP ID or cell ID included in the spatial relation information and/or pathloss reference information associated with an SRS resource as a target TRP or cell for the transmission of the SRS resource. In this way, the first device 110 may determine the same or different PAPR threshold value for the transmission of each RS resource depending on the target TRP or cell.
  • the first device 110 may calculate a PAPR (or a PAPR value) of each RS frequency hop.
  • the first device 110 may calculate a cubic metric for PARP values of the frequency hops.
  • the first device 110 may derive the PAPR of each RS frequency hop for the provided RS sequence.
  • the first device 110 may calculate the PAPR of the j-th RS frequency hop as follows:
  • Q IDFT represents an inverse discrete Fourier transform matrix.
  • M represents the total number of configured RS frequency hops.
  • N j represents the number of subcarriers of j-th RS frequency hop. That is, equation (1) means a ratio of the maximum power of the time-domain Tx signals at the j-th frequency hop and the average power of this Tx signals. If the ratio is high, the device may need a power amplifier providing a large dynamic range to avoid non-linear signal distortion, where the dynamic range means a linear operating range of the power amplifier.
  • the first device 110 may decide whether to use the provided RS sequence for the transmission of RS frequency hops or not. For example, the first device 110 may determine not to use the provided sequence if the PAPR value of any one of the frequency hops is greater than the threshold PAPR, for example, PAPR j > ⁇ 0 for all j ⁇ ⁇ 1, 2, ..., M ⁇ . As another example, the first device 110 may determine not to use the provided sequence if PAPR values of a part of frequency hops are greater than the threshold, for example, PAPR j > ⁇ 0 for M 1 frequency hops (wherein M 1 >1) . In some example embodiments, the M 1 value may be indicated by the second device to the first device. The first device may be configured to not use the provided sequence if PAPR values of M 1 frequency hops are greater than the threshold PAPR.
  • the first device 110 may take into account the signal distortion that may occur due to the high PAPR, and it may try to keep the PAPR below a specific threshold or level (e.g., ⁇ 0 ) to maintain the quality of transmitted signals. For example, the first device 110 may use the following criterion. If PAPR j > ⁇ 0 for all j ⁇ ⁇ 1, 2, ..., M ⁇ , the first device 110 may determine that it will not use this RS sequence.
  • a specific threshold or level e.g., ⁇ 0
  • the first device 110 may determine that it will not use this RS sequence.
  • the signal distortion is allowed in a part of the RS frequency hops, which is more feasible and flexible as it may be difficult to maintain PAPR values for overall RS frequency hops below a threshold.
  • the first device 110 may use the different threshold values for different receivers as follows: if PAPR j > ⁇ 0, l for all j ⁇ ⁇ 1, 2, ..., M ⁇ and for the l-th TRP or cell, the first device 110 may determine that it will not use the RS sequence for the RS resource targeting the l-th TRP or cell. If PAPR j ⁇ 0, l for M 1 ( ⁇ M) RS frequency hops and for the l-th TRP or cell, the first device 110 may determine that it will not use the RS sequence for the RS resource targeting the l-th TRP or cell.
  • the first device 110 may approximately derive the signal distortion level based on its power amplifier capability such as a dynamic range. For example, the first device 110 can assume that the time-domain transmission signal is distorted or clipped outside of the dynamic range. In this case, if the tolerant signal distortion level is not provided by the network, the first device 110 may determine the threshold PAPR based on the power amplifier capability.
  • the first device 110 may transmit (225) to the second device 120 a message requesting for another RS sequence (referred to as a second RS sequence) which may need to satisfy the condition.
  • the message may include a first request of a configuration for at least the second RS sequence.
  • the requesting message may be transmitted via a configured-grant PUSCH.
  • the Message 3 or Message A may be used for the transmission of the message.
  • a new RRC signaling may be used.
  • the second device 120 may determine (230) the second RS sequence for the first device 110.
  • the first device 110 may transmit the threshold PAPR to the second device 120.
  • the threshold PAPR may be included in the message requesting for the second RS sequence that is transmitted from the first device 110 to the second device 120.
  • the second RS sequence may be determined by the second device 120 as it satisfies the following condition: PAPR j ⁇ 0 for all j ⁇ ⁇ 1, 2, ..., M ⁇ , or PAPR j ⁇ 0 for M 1 (M 1 ⁇ M) RS frequency hops.
  • the first device 110 may transmit the requesting message to trigger the network to provide another RS sequence for the frequency hopping so that it satisfies at least one of the following condition: PAPR j ⁇ 0, l for all j ⁇ ⁇ 1, 2, ..., M ⁇ and for the l-th TRP or cell, or PAPR j ⁇ 0, l for M 1 ( ⁇ M) SRS frequency hops and for the l-th TRP or cell.
  • the second device 120 may check the currently allocated sequences to the devices (such as RedCap UEs) for RS frequency hopping and determine an SRS sequence satisfying the requested PAPR level. To determine the second RS sequence, the second device 120 may try an exhaustive search in the feasible set of RS sequences and may calculate PAPRs as described above, and the second device 120 may also use ⁇ 0 to compare the calculated PAPR to the threshold value.
  • the devices such as RedCap UEs
  • the message requesting for the second RS sequence transmitted from the first device 110 to the second device 120 may include a set of RS sequences that is recommended by the first device 110.
  • the set of RS sequences may satisfy the required PAPR to transmit RS on the RS frequency hops.
  • the first device 110 may determine the set of RS sequences based on the configuration for frequency hopping of the reference signal.
  • the second device 120 may take into account the set of sequences and check already allocated sequences to other devices. If there is no interference issue, the second device 120 may provide the second RS sequence by selecting one sequence in the set RS sequences provided by the first device 110.
  • the determination of the second RS sequency may be implemented by the third device 130.
  • the first device 110 may transmit the requesting message requesting to the third device 130.
  • the third device 130 may determine a set of RS sequences.
  • the third device 130 may try an exhaustive search in the feasible set of RS sequences and find the RS sequences that can satisfy the condition.
  • the first device 110 may send a set of recommended RS sequences to the third device 130.
  • the third device 130 may determine a further set of RS sequences from the set of RS sequences provided by the first device 110.
  • the third device 130 may transmit the further set of RS sequences to the second device 120.
  • the second reference signal sequence to be used by the first device 110 may be determined by the second device 120 from the further set of reference signal sequences provided by the third device 130.
  • the second device 120 may transmit (235) a configuration for the second RS sequence to the first device 110.
  • the second device 120 may provide the first device 110 with an identification (ID) of the second RS sequence that satisfies the requested PAPR condition.
  • the first device 110 may use the second RS sequence for the SRS frequency hopping and transmit (245) a RS generated based on the second RS sequence.
  • the surrounding devices may receive the RS from the first device 110, for example, for positioning of the first device 110.
  • the second device 120 may also transmit (240) such a configuration to the third device 130. Then, the third device 130 may inform the second RS sequence to other devices such as neighbor gNBs or cells. In some scenarios, the neighbor cells are provided with the updated sequence for the RS resource for frequency hopping by the third device 130. Accordingly, the RS transmitted by the first device 110 may also be received by the neighbor devices.
  • the second device 120 may not accept the first request for at least the second RS sequence from the first device 110.
  • the second device 120 may not accept the first request if all of the feasible sequences were already allocated to other devices.
  • the second device 120 may send a notification of a rejection for the second reference signal sequence to the first device 110, which may mean that the first request is rejected. Then the first device 110 may receive such a notification.
  • the first device 110 may use the currently configured first RS sequence to generate a RS.
  • the first device 110 may transmit RS over RS frequency hops. In this case, if the first device 110 receives the updated second RS sequence, the first device 110 may transmit the RS over RS frequency hops using the updated RS sequence. If the first request for the second RS sequence is not accepted by the second device 120, then the first device 110 may transmit the RS over RS frequency hops using the currently configured first RS sequence.
  • the first device 110 may report to the second device 120 which RS frequency hop (s) is affected by high PAPR problem. In an example, if a PAPR associated with the first reference signal sequence is greater than a threshold at certain frequency hop (s) , the first device 110 may determine that the frequency hop (s) is affected from signal distortion associated with a PAPR or affected by high PAPR problem. The first device 110 may transmit to the second device 120 information on at least one affected frequency hop such as IDs of the frequency hop (or frequency hop IDs) .
  • the second device 120 may transmit to the first device 110 an indication to report an affected frequency hop. Based on this indication, the first device 110 may inform the second device 120 which RS frequency hops are affected by the PAPR problem.
  • the first device 110 may instead calculate a necessary bandwidth of each hop for a given sequence in order to avoid the high PAPR issue and then inform the second device 120 about this requirement. For example, in the case that the first device 110 is configured with a bandwidth of 20MHz for each frequency hop, the first device 110 may determine that for the configured RS sequence, if it uses hops of 10 MHz, then it may avoid the high PAPR issue. Similarly, the first device 110 may determine that a larger hop bandwidth (still less than or equal to 20 MHz) may avoid the higher PAPR issue.
  • the first device 110 may transmit a second request to the second device 120.
  • the second request may comprise at least one of: a bandwidth or the number of resource block (s) of at least one frequency hop, or the number of overlapping resource block (s) , such as physical resource blocks (PRBs) , between frequency hops.
  • the first device 110 requests the second device 120 to reconfigure it with the new bandwidth per hop in order to use the same RS sequence originally configured by the second device 120.
  • the first device 110 may request a different amount of overlapping PRBs between the hops such that the PAPR issue is resolved. In this case, the bandwidth size may be reduced by reducing the overlapping PRBs.
  • a RedCap UE 302 is an example implementation of the first device 110, which may transmit an SRS for positioning.
  • a gNB 304 which serves a serving cell is an example implementation of the second device 120.
  • an LMF 308 is an example implementation of the third device 130.
  • the LMF 308 may initiate a positioning session for the RedCap UE 302.
  • the LMF 308 may trigger a UL-based positioning approach or Multi-Round Trip Time (Multi-RTT) approach.
  • Multi-RTT Multi-Round Trip Time
  • FIG. 3 illustrates an example process 300 of RS frequency hopping in accordance with some example embodiments of the present disclosure.
  • the gNB 304 may transmit a configuration for SRS frequency hopping to the RedCap UE 302.
  • the gNB 304 may also transmit the configuration for SRS frequency hopping to the LMF 308.
  • the LMF 308 may provide the configuration for SRS frequency hopping to the gNB 306.
  • the gNB 304 may provide a tolerant signal distortion level to the RedCap UE 302. Then, at 318, the RedCap UE 302 may calculate a threshold value of PAPR considering the provided tolerant signal distortion level. At 320, if the RedCap UE 302 determines that the PAPR values to transmit an SRS exceeds the calculated threshold value of PAPR at one or more SRS frequency hops, the RedCap UE 302 determines that it will not use the provided sequence.
  • the RedCap UE 302 may request the gNB 304 for a different sequence satisfying PAPR conditions on overall or a part of the configured SRS frequency hops, so that the gNB 304 may provide another SRS sequence to be used for SRS transmission on the SRS frequency hops.
  • the gNB 304 may check the currently allocated SRS sequences to the RedCap UEs in multiple cells for positioning. At 326, the gNB 304 may determine a sequence satisfying the requested PAPR level. To determine the sequence, the gNB 304 may try an exhaustive search in the feasible set of SRS sequences.
  • the gNB 304 may provide the determined SRS sequence for SRS frequency hopping to the RedCap UE 302 and to the LMF 308.
  • the LMF 308 may provide the updated sequence information to the gNB 306, and at 332 the RedCap UE 302 may transmit SRS on the SRS frequency hops to the gNB 304.
  • the gNB 304 may send a message to inform the RedCap UE 302 that the request is rejected. Then, at 332, the RedCap UE 302 may transmit information on frequency hop (s) affected by the PAPR problem to the gNB 304.
  • FIG. 4 illustrates another example process 400 of RS frequency hopping in accordance with some other example embodiments of the present disclosure.
  • the gNB 304 may transmit a configuration for SRS frequency hopping to the RedCap UE 302.
  • the gNB 304 may also transmit the configuration for SRS frequency hopping to the LMF 308.
  • the LMF 308 may provide the configuration for SRS frequency hopping to the gNB 306.
  • the gNB 304 may provide one or multiple tolerant signal distortion levels of SRS frequency hopping where each one is associated with a TRP or cell to the RedCap UE 302.
  • the RedCap UE 302 may calculate a threshold value of PAPR considering the provided tolerant signal distortion level (s) .
  • the RedCap UE 302 may determine that it will not use the provided sequence.
  • the RedCap UE 302 may request the LMF 308 (instead of the gNB 304) for a different sequence satisfying PAPR condition on one or more of the SRS frequency hops, so that the LMF 308 may provide another SRS sequence to be used for SRS transmission on the SRS frequency hops.
  • the LMF 308 may check the currently allocated SRS sequences to the RedCap UEs in multiple cells for positioning. At 426, the LMF 308 may determine a sequence satisfying the requested PAPR level. To determine the sequence, the LMF 308 may try an exhaustive search in the feasible set of SRS sequences.
  • the LMF 308 may transmit to the gNB 304 the determined set of sequences satisfying the request of the RedCap UE 302.
  • the gNB 304 may transmit the updated SRS sequences for one or more configurations of SRS frequency hopping to the RedCap UE 302 and to LMF 308.
  • the LMF 308 provides the updated SRS sequences to the gNB 306.
  • the RedCap UE 302 may transmit SRS on the SRS frequency hops using the updated SRS sequences to the gNB 304 and the gNB 306.
  • the LMF 308 may receive the request from the RedCap UE 302 and provide a set of sequences to the gNB 304 so that the gNB 304 may determine the sequence to be used by the RedCap UE 302.
  • the gNB 304 may determine the sequence to be used and provide the determined sequence to the LMF 308, and then the LMF 308 may provide the sequence to the gNB 306 which serves neighbor cell (s) .
  • FIG. 5 illustrates a further example process 500 of RS frequency hopping in accordance with yet some other example embodiments of the present disclosure.
  • the operations at 510 to 520 are similar to the operations at 410 to 420 in the process 400 as shown in FIG. 4. For the purpose of simplification, the details will be omitted.
  • the RedCap UE 302 may request the gNB 304 for a different sequence satisfying PAPR conditions on one or more of the SRS frequency hops, so that the gNB 304 may provide another SRS sequence to be used for SRS transmission on the SRS frequency hops.
  • the gNB 304 may check the currently allocated SRS sequences to the RedCap UEs in multiple cells for positioning. In this example, at 526, the gNB 304 may decide not to accept the request from the RedCap UE 302. Then, at 528, the gNB 304 may transmit a rejection message about the request and indicate the RedCap UE 302 to report information on frequency hop (s) affected by the PAPR problem. At 530, the RedCap UE 302 may transmit an SRS on the SRS frequency hops using the configured SRS sequence and transmit information on the SRS frequency hop affected by the PAPR problem to the gNB 304. At 532, the RedCap UE 302 may transmit the SRS on the SRS frequency hops using the configured sequence.
  • the RedCap UE 302 may transmit a requesting message to the gNB 304, but the gNB 304 may not accept the request from the RedCap UE 302.
  • the RedCap UE 302 is indicated to report information on the SRS frequency hop affected by high PAPR problem.
  • the UE may report SRS frequency hop ID (s) .
  • FIG. 6 shows a flowchart of an example method 600 implemented at a first device in accordance with some example embodiments of the present disclosure.
  • the method 600 can be implemented by the first device 110 as shown in FIG. 1 A.
  • the method 600 will be described from the perspective of the first device 110 with reference to FIG. 1A.
  • the first device 110 receives, from a second device, at least one configuration for frequency hopping of a reference signal.
  • the at least one configuration including information on at least a first reference signal sequence.
  • the first device 110 transmits a message requesting for a second reference signal sequence.
  • the first device 110 may determine a set of reference signal sequences satisfying the condition.
  • the message may include the determined set of reference signal sequences to request a reference signal sequence of the set of reference signal sequences as the second reference signal sequence.
  • the first device 110 may determine whether the PAPR associated with the first reference signal sequence is greater than a threshold PAPR at the one or more frequency hops. Based on a determination that the PAPR is greater than the threshold PAPR at the one or more frequency hops, the first device 110 may determine that the condition is unsatisfied.
  • the first device 110 may determine at least one threshold PAPR based on at least one of the following: a power amplifier capability including a dynamic range of the first device or at least one allowable signal distortion level of at least one receiver of the reference signal.
  • the first device 110 may receive, from the second device 120, the at least one allowable signal distortion level.
  • the at least one allowable signal distortion level may be indicated per receiver.
  • the at least one allowable signal distortion level and the at least one configuration for the frequency hopping may be received in one signaling message.
  • the message may further include the determined threshold PAPR.
  • the message may include a first request of a configuration for at least the second reference signal sequence satisfying the condition.
  • the first device 110 may receive, from the second device 120, a configuration for the second reference signal sequence. Then, the first device 110 may generate a reference signal based on the second reference signal sequence and transmit the generated reference signal.
  • the first device 110 may receive, from the second device 120, a notification of a rejection for the second reference signal sequence. In these example embodiments, the first device 110 may generate a reference signal based on the first reference signal sequence and transmit the generated reference signal.
  • the first device 110 may transmit, to the second device 120, information on at least one frequency hop affected from signal distortion associated with a PAPR.
  • the PAPR associated with the first reference signal sequence may be greater than a threshold at the at least one affected frequency hop.
  • the information on the at least one frequency hop may comprise at least one identification of the at least one frequency hop.
  • the first device 110 may receive, from the second device 120, an indication to report information on a frequency hop of the at least one affected frequency hop.
  • the first device 110 may transmit a second request related to at least one of: a bandwidth or the number of resource blocks of at least one frequency hop, or the number of overlapping resource blocks between frequency hops.
  • the reference signal may be used for positioning of the first device.
  • FIG. 7 shows a flowchart of an example method 700 implemented at a second device in accordance with some example embodiments of the present disclosure.
  • the method 700 can be implemented by the second device 120 as shown in FIG. 1A.
  • the method 700 will be described from the perspective of the second device 120 with reference to FIG. 1A.
  • the second device 120 transmits, to the first device 110, at least one configuration for frequency hopping of a reference signal, the at least one configuration including information on at least a first reference signal sequence.
  • the second device 120 receives, from the first device 110, a message requesting for a second reference signal sequence.
  • the message may include at least one of: a threshold PAPR for one or more of frequency hops of the reference signal, a first request of a configuration for at least one further reference signal sequence providing a PAPR lower than the threshold PAPR, or a set of reference signal sequences providing a set of PAPRs lower than the threshold PAPR.
  • the second device 120 may transmit a configuration for the second reference signal sequence.
  • the second reference signal sequence may be determined from the set of reference signal sequences.
  • the second reference signal sequence may be determined based on a determination that the PAPR associated with the second reference signal sequence is equal to or less than the threshold PAPR at a predetermined number of frequency hops.
  • the second device 120 may transmit, to the third device 130, the at least one of the first request or the set of reference signal sequences.
  • the second device 120 may receive, from the third device 130, a further set of refence signal sequences.
  • the second reference signal sequence may be determined from the further set of refence signal sequences.
  • the second device 120 may transmit, to the first device 110, a notification of a rejection for the second reference signal sequence.
  • the second device 120 may receive, from the first device 110, information on at least one frequency hop affected from signal distortion associated with a PAPR.
  • a PAPR associated with the first reference signal sequence may be greater than the threshold PAPR at the at least one affected frequency hop.
  • the information on the at least one frequency hop may comprise at least one identification of the at least one frequency hop.
  • the second device 120 may transmit, to the first device 110, an indication to report information on a frequency hop of the at least one affected frequency hop.
  • the second device 120 may transmit, to the first device 110, at least one allowable signal distortion level of at least one receiver of the reference signal.
  • the second device 120 may determine the at least one allowable signal distortion level based on at least one of: a received signal strength of the at least one receiver, a distance between the first device and the at least one receiver, or required measurement accuracy of the at least one receiver.
  • the at least one allowable signal distortion level may be indicated to the first device per receiver.
  • the at least one signal distortion allowable level and the at least one configuration for the frequency hopping may be transmitted in one signaling message.
  • the second device 120 may receive, from the first device 110, a second request related to at least one of a bandwidth or the number of resource blocks of at least one frequency hop, or the number of overlapping resource blocks between frequency hops.
  • the second device 120 may transmit, to the third device 130, the at least one configuration for the frequency hopping of the reference signal.
  • FIG. 8 shows a flowchart of an example method 800 implemented at a third device in accordance with some example embodiments of the present disclosure.
  • the method 800 can be implemented by the third device 130 as shown in FIG. 1A.
  • the method 800 will be described from the perspective of the third device 130 with reference to FIG. 1A.
  • the third device 130 receives, from the second device 120, at least one configuration for frequency hopping of a reference signal to be transmitted by a first device, the at least one configuration including information on at least a first reference signal sequence.
  • the third device 130 receives, from the first device 110, a message requesting for a second reference signal sequence.
  • the message may include at least one of a threshold PAPR, a first request of a configuration for at least one further reference signal sequence providing a PAPR lower than the threshold PAPR, or a set of reference signal sequences providing a set of PAPRs lower than the threshold PAPR.
  • the method 800 further comprises: transmitting, to the second device, a further set of refence signal sequences for use by the first device.
  • the third device 130 in response to receiving the set of reference signal sequences from the first device, the third device 130 may determine the further set of refence signal sequences from the received set of refence signal sequences.
  • the further set of refence signal sequences may be determined based on a determination that a set of PAPRs associated with the second set of refence signal sequences is equal to or less than the threshold PAPR at a predetermined number of frequency hops.
  • a first apparatus capable of performing the method 600 may comprise means for performing the respective operations of the method 600.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the first apparatus may be implemented as or included in the first device 110 in FIG. 1A.
  • the first apparatus comprises means for receiving, from a second device, at least one configuration for frequency hopping of a reference signal, the at least one configuration including information on at least a first reference signal sequence; and means for based on a determination that a condition related to a PAPR at one or more frequency hops is unsatisfied by the first reference signal sequence, transmitting a message requesting for a second reference signal sequence.
  • the first apparatus further comprises means for determining, based on the configuration for frequency hopping of the reference signal, a set of reference signal sequences satisfying the condition, wherein the message includes the determined set of reference signal sequences to request a reference signal sequence of the set of reference signal sequences as the second reference signal sequence.
  • the first apparatus further comprises: means for determining whether the PAPR associated with the first reference signal sequence is greater than a threshold PAPR at the one or more frequency hops; and means for based on a determination that the PAPR is greater than the threshold PAPR at the one or more frequency hops, determining that the condition is unsatisfied.
  • the first apparatus further comprises: means for determining at least one threshold PAPR based on at least one of the following: a power amplifier capability including a dynamic range of the first device or at least one allowable signal distortion level of at least one receiver of the reference signal.
  • the first apparatus further comprises: means for receiving, from the second device, the at least one allowable signal distortion level.
  • the at least one allowable signal distortion level is indicated per receiver.
  • the at least one allowable signal distortion level and the at least one configuration for the frequency hopping is received in one signaling message.
  • the message further includes the determined threshold PAPR.
  • the message includes a first request of a configuration for at least the second reference signal sequence satisfying the condition.
  • the first apparatus further comprises: means for receiving, from the second device, a configuration for the second reference signal sequence; means for generating a reference signal based on the second reference signal sequence; and means for transmitting the generated reference signal.
  • the first apparatus further comprises: means for receiving, from the second device, a notification of a rejection for the second reference signal sequence; means for generating a reference signal based on the first reference signal sequence; and means for transmitting the generated reference signal.
  • the first apparatus further comprises: means for transmitting, to the second device, information on at least one frequency hop affected from signal distortion associated with a PAPR, wherein the PAPR associated with the first reference signal sequence is greater than a threshold at the at least one affected frequency hop.
  • the information on the at least one frequency hop comprises at least one identification of the at least one frequency hop.
  • the first apparatus further comprises: means for receiving, from the second device, an indication to report information on a frequency hop of the at least one affected frequency hop.
  • the first apparatus further comprises: means for based on a determination that the condition is unsatisfied, transmitting a second request related to at least one of: a bandwidth or the number of resource blocks of at least one frequency hop, or the number of overlapping resource blocks between frequency hops.
  • the reference signal is used for positioning of the first device.
  • the first device comprises a terminal device
  • the second device comprises a network device
  • the first apparatus further comprises means for performing other operations in some example embodiments of the method 600 or the first device 110.
  • the means comprises at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the performance of the first apparatus.
  • a second apparatus capable of performing the method 700 may comprise means for performing the respective operations of the method 700.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the second apparatus may be implemented as or included in the second device 120 in FIG. 1A.
  • the second apparatus comprises means for transmitting, to a first device, at least one configuration for frequency hopping of a reference signal, the at least one configuration including information on at least a first reference signal sequence; and means for receiving, from the first device, a message requesting for a second reference signal sequence.
  • the message includes at least one of: a threshold PAPR for one or more of frequency hops of the reference signal, a first request of a configuration for at least one further reference signal sequence providing a PAPR lower than the threshold PAPR, or a set of reference signal sequences providing a set of PAPRs lower than the threshold PAPR.
  • the second apparatus further comprises: means for transmitting a configuration for the second reference signal sequence.
  • the second reference signal sequence is determined from the set of reference signal sequences.
  • the second reference signal sequence is determined based on a determination that the PAPR associated with the second reference signal sequence is equal to or less than the threshold PAPR at a predetermined number of frequency hops.
  • the second apparatus further comprises: means for transmitting, to a third device, the at least one of the first request or the set of reference signal sequences; and means for receiving, from the third device, a further set of refence signal sequences, wherein the second reference signal sequence is determined from the further set of refence signal sequences.
  • the second apparatus further comprises: means for transmitting, to the first device, a notification of a rejection for the second reference signal sequence.
  • the second apparatus further comprises: means for receiving, from the first device, information on at least one frequency hop affected from signal distortion associated with a PAPR, wherein a PAPR associated with the first reference signal sequence is greater than the threshold PAPR at the at least one affected frequency hop.
  • the information on the at least one frequency hop comprises at least one identification of the at least one frequency hop.
  • the second apparatus further comprises: means for transmitting, to the first device, an indication to report information on a frequency hop of the at least one affected frequency hop.
  • the second apparatus further comprises: means for transmitting, to the first device, at least one allowable signal distortion level of at least one receiver of the reference signal.
  • the second apparatus further comprises: means for determining the at least one allowable signal distortion level based on at least one of: a received signal strength of the at least one receiver, a distance between the first device and the at least one receiver, or required measurement accuracy of the at least one receiver.
  • the at least one allowable signal distortion level is indicated to the first device per receiver.
  • the at least one signal distortion allowable level and the at least one configuration for the frequency hopping is transmitted in one signaling message.
  • the second apparatus further comprises: means for receiving, from the first device, a second request related to at least one of a bandwidth or the number of resource blocks of at least one frequency hop, or the number of overlapping resource blocks between frequency hops.
  • the reference signal is used for positioning of the first device.
  • the second apparatus further comprises: means for transmitting, to a third device, the at least one configuration for the frequency hopping of the reference signal.
  • the first device comprises a terminal device
  • the second device comprises a network device
  • the third device comprises a location management function
  • the second apparatus further comprises means for performing other operations in some example embodiments of the method 700 or the second device 120.
  • the means comprises at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the performance of the second apparatus.
  • a third apparatus capable of performing the method 800 may comprise means for performing the respective operations of the method 800.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the third apparatus may be implemented as or included in the third device 130 in FIG. 1A.
  • the third apparatus comprises means for receiving, from a second device, at least one configuration for frequency hopping of a reference signal to be transmitted by a first device, the at least one configuration including information on at least a first reference signal sequence; and means for receiving, from the first device, a message requesting for a second reference signal sequence.
  • the message includes at least one of a threshold PAPR, a first request of a configuration for at least one further reference signal sequence providing a PAPR lower than the threshold PAPR, or a set of reference signal sequences providing a set of PAPRs lower than the threshold PAPR.
  • the third apparatus further comprises: means for transmitting, to the second device, a further set of refence signal sequences for use by the first device.
  • the third apparatus further comprises: means for in response to receiving the set of reference signal sequences from the first device, determining the further set of refence signal sequences from the received set of refence signal sequences.
  • the further set of refence signal sequences is determined based on a determination that a set of PAPRs associated with the second set of refence signal sequences is equal to or less than the threshold PAPR at a predetermined number of frequency hops.
  • the reference signal is used for positioning of the first device.
  • the first device comprises a terminal device
  • the second device comprises a network device
  • the third device comprises a location management function
  • the third apparatus further comprises means for performing other operations in some example embodiments of the method 800 or the third device 130.
  • the means comprises at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the performance of the third apparatus.
  • FIG. 9 is a simplified block diagram of a device 900 that is suitable for implementing example embodiments of the present disclosure.
  • the device 900 may be provided to implement a communication device, for example, the first device 110, the second device 120 or the third device 130 as shown in FIG. 1A.
  • the device 900 includes one or more processors 910, one or more memories 920 coupled to the processor 910, and one or more communication modules 940 coupled to the processor 910.
  • the communication module 940 is for bidirectional communications.
  • the communication module 940 has one or more communication interfaces to facilitate communication with one or more other modules or devices.
  • the communication interfaces may represent any interface that is necessary for communication with other network elements.
  • the communication module 940 may include at least one antenna.
  • the processor 910 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 900 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 920 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) 924, an electrically programmable read only memory (EPROM) , a flash memory, a hard disk, a compact disc (CD) , a digital video disk (DVD) , an optical disk, a laser disk, and other magnetic storage and/or optical storage.
  • ROM Read Only Memory
  • EPROM electrically programmable read only memory
  • flash memory a hard disk
  • CD compact disc
  • DVD digital video disk
  • optical disk a laser disk
  • RAM random access memory
  • a computer program 930 includes computer executable instructions that are executed by the associated processor 910.
  • the instructions of the program 930 may include instructions for performing operations/acts of some example embodiments of the present disclosure.
  • the program 930 may be stored in the memory, e.g., the ROM 924.
  • the processor 910 may perform any suitable actions and processing by loading the program 930 into the RAM 922.
  • the example embodiments of the present disclosure may be implemented by means of the program 930 so that the device 900 may perform any process of the disclosure as discussed with reference to FIG. 1A to FIG. 8.
  • the example embodiments of the present disclosure may also be implemented by hardware or by a combination of software and hardware.
  • the program 930 may be tangibly contained in a computer readable medium which may be included in the device 900 (such as in the memory 920) or other storage devices that are accessible by the device 900.
  • the device 900 may load the program 930 from the computer readable medium to the RAM 922 for execution.
  • the computer readable medium may include any types of non-transitory storage medium, such as ROM, EPROM, a flash memory, a hard disk, CD, DVD, and the like.
  • 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) .
  • FIG. 10 shows an example of the computer readable medium 1000 which may be in form of CD, DVD or other optical storage disk.
  • the computer readable medium 1000 has the program 930 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, and other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. Although 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.
  • Some example embodiments of the present disclosure also provide at least one computer program product tangibly stored on a computer readable medium, such as a non-transitory computer readable medium.
  • the computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target physical or virtual processor, to carry out any of the methods as described above.
  • 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.
  • the program code 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 code, 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 code 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Des exemples de modes de réalisation de la présente divulgation concernent des procédés, des dispositifs, des appareils et un support de stockage lisible par ordinateur pour le saut de fréquence d'un signal de référence. Dans un procédé, un premier dispositif reçoit, en provenance d'un second dispositif, au moins une configuration pour le saut de fréquence d'un signal de référence. La ou les configurations comprennent des informations sur au moins une première séquence de signaux de référence. Ensuite, sur la base d'une détermination selon laquelle une condition relative à un PAPR au niveau d'un ou plusieurs sauts de fréquence est non satisfaite par la première séquence de signaux de référence, le premier dispositif émet un message demandant une seconde séquence de signaux de référence.
PCT/CN2023/093208 2023-05-10 2023-05-10 Saut de fréquence de signal de référence Pending WO2024229737A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2023/093208 WO2024229737A1 (fr) 2023-05-10 2023-05-10 Saut de fréquence de signal de référence
CN202380098111.8A CN121153220A (zh) 2023-05-10 2023-05-10 参考信号的频率跳变

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2023/093208 WO2024229737A1 (fr) 2023-05-10 2023-05-10 Saut de fréquence de signal de référence

Publications (1)

Publication Number Publication Date
WO2024229737A1 true WO2024229737A1 (fr) 2024-11-14

Family

ID=93431588

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2023/093208 Pending WO2024229737A1 (fr) 2023-05-10 2023-05-10 Saut de fréquence de signal de référence

Country Status (2)

Country Link
CN (1) CN121153220A (fr)
WO (1) WO2024229737A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110301113A (zh) * 2017-02-14 2019-10-01 Lg电子株式会社 接收srs配置信息的方法和用于该方法的终端
US20220007349A1 (en) * 2020-07-03 2022-01-06 Qualcomm Incorporated Reference transmission reception point for frequency-domain resource and on-demand request for positioning reference signal
US20220029763A1 (en) * 2020-07-27 2022-01-27 Qualcomm Incorporated Selective cancellation of on-demand positioning reference signal (prs) occasions
CN115336294A (zh) * 2020-04-03 2022-11-11 高通股份有限公司 按需定位参考信号和逐频带部署方面

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110301113A (zh) * 2017-02-14 2019-10-01 Lg电子株式会社 接收srs配置信息的方法和用于该方法的终端
CN115336294A (zh) * 2020-04-03 2022-11-11 高通股份有限公司 按需定位参考信号和逐频带部署方面
US20220007349A1 (en) * 2020-07-03 2022-01-06 Qualcomm Incorporated Reference transmission reception point for frequency-domain resource and on-demand request for positioning reference signal
US20220029763A1 (en) * 2020-07-27 2022-01-27 Qualcomm Incorporated Selective cancellation of on-demand positioning reference signal (prs) occasions

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ERICSSON: "UL Reference Signals for NR Positioning", 3GPP DRAFT; R1-1913136, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Reno, NV, USA; 20191118 - 20191122, 8 November 2019 (2019-11-08), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051820324 *

Also Published As

Publication number Publication date
CN121153220A (zh) 2025-12-16

Similar Documents

Publication Publication Date Title
WO2022151285A1 (fr) Schéma de répétition pour une transmission
WO2024229737A1 (fr) Saut de fréquence de signal de référence
WO2025060057A1 (fr) Saut de fréquence de signal de référence de positionnement
WO2025091321A1 (fr) Rapport de mesure dans un saut de fréquence
US20250167962A1 (en) Single downlink control information based activation command for transmission configuration indication state
US20250062881A1 (en) Limited buffer rate matching calculation
WO2024239130A1 (fr) Rapport de capacité d'équipement d'utilisateur et application sur interruption pour des mesures
WO2025166523A1 (fr) Réglage de synchronisation pour mesure
WO2025065392A1 (fr) Indication de période de commutation
US20250056520A1 (en) Beam management assistance
US20250056339A1 (en) Methods, devices, apparatuses and medium for measurement-based tci state activation
WO2024239185A1 (fr) Améliorations pour spectre sans licence de liaison latérale
WO2025054817A1 (fr) Attribution de sous-bande pour sous-réseau
US20250300793A1 (en) Transmission configuration indicator state update
US20250056250A1 (en) Master node centric reference configuration generation
WO2025015535A1 (fr) Structure de cadre flexible
WO2024031247A1 (fr) Exigence de mesure pour économie d'énergie
WO2024138445A1 (fr) Configuration de sous-bande pour duplex intégral sans chevauchement de sous-bande
WO2024212064A1 (fr) Rapport de csi pour activation de cellule
US20240381323A1 (en) User equipment architecture adaptation for intra-band scenarios
WO2024031365A1 (fr) Initiation pour un état connecté de commande de ressources radio
US20240284207A1 (en) Spatial adaptation for energy saving
WO2025076831A1 (fr) Optimisation de paramètres de transmission
WO2025118301A1 (fr) Rapport de restriction de capacité
WO2024168848A1 (fr) Mesure de validation pour activation de cellule

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23936060

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2023936060

Country of ref document: EP

ENP Entry into the national phase

Ref document number: 2023936060

Country of ref document: EP

Effective date: 20251210