WO2024068632A1 - Positionnement par transmission de signal de référence de positionnement au moyen d'un motif de saut de fréquence - Google Patents

Positionnement par transmission de signal de référence de positionnement au moyen d'un motif de saut de fréquence Download PDF

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Publication number
WO2024068632A1
WO2024068632A1 PCT/EP2023/076548 EP2023076548W WO2024068632A1 WO 2024068632 A1 WO2024068632 A1 WO 2024068632A1 EP 2023076548 W EP2023076548 W EP 2023076548W WO 2024068632 A1 WO2024068632 A1 WO 2024068632A1
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WIPO (PCT)
Prior art keywords
frequency
configuration
bands
transmission
repetitive transmission
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PCT/EP2023/076548
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English (en)
Inventor
Basuki PRIYANTO
Yujie Zhang
Anders Berggren
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Sony Group Corporation
Sony Europe B.V.
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Application filed by Sony Group Corporation, Sony Europe B.V. filed Critical Sony Group Corporation
Publication of WO2024068632A1 publication Critical patent/WO2024068632A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • 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
    • H04L5/0037—Inter-user or inter-terminal allocation
    • H04L5/0039—Frequency-contiguous, i.e. with no allocation of frequencies for one user or terminal between the frequencies allocated to another

Definitions

  • Various aspects of the disclosure pertain to techniques related to positioning of wireless terminals that are connectable to a cellular network. Various examples specifically relate to techniques related to positioning of wireless terminals that have a limited device bandwidth.
  • multilateration and multiangulation techniques can be employed.
  • An example of multiangulation is triangulation.
  • RSs reference signals
  • a UE can receive the P-RSs and then trigger a multilateration or multiangulation for UE positioning estimation. This is a scenario which corresponds to a transmission of downlink P-RSs; also, similar concept can also be applied in uplink direction where positioning based on uplink P-RSs is known.
  • positioning procedures are available when communicating according to the Third Generation Partnership Project (3GPP) 5G New Radio (NR) protocol.
  • 3GPP Third Generation Partnership Project
  • NR 5G New Radio
  • PRS Positioning Reference Signal
  • SRS Sounding Reference Signal
  • PRS and SRS are, accordingly, example implementations of the P-RS.
  • the PRS can be allocated at any physical resource block (PRB) within a system bandwidth and the bandwidth can be configured from 24 PRBs to 276 PRBs in steps of 4 PRBs.
  • the equivalent maximum bandwidth is around 100 MHz - for the case of 30 kHz sub-carrier spacing (SCS) - and around 400 MHz - for the case of 120 kHz SCS.
  • SCS sub-carrier spacing
  • Some UEs are designed to receive the PRS across the carrier band I system bandwidth. I.e., a device bandwidth of these UEs covers the system bandwidth. Such UEs will be referred to as wideband UEs hereinafter.
  • some types of UEs do not support reception of PRS or other P-RS across the entire carrier band. Such UEs can only monitor a relatively narrower bandwidth or a fraction of system bandwidth, if compared to the wideband UEs. Such UEs will be referred to as bandlimited UEs hereinafter.
  • RedCap reduced capability
  • the main properties of a RedCap UE is as follows: Reduced maximum device bandwidth: Maximum device bandwidth of a frequency range 1 (FR1) RedCap UE during and after initial access is 20 MHz. Maximum device bandwidth of a frequency range (FR2) RedCap UE during and after initial access is 100 MHz.
  • FR1 the RedCap device bandwidth is significantly reduced from 100 MHz to 20 MHz, i.e., is significantly lower than the system bandwidth.
  • the RedCap UE can only receive and perform positioning measurement based on a portion (i.e., max 20 MHz) of the system bandwidth. This will significantly reduce the positioning accuracy of a RedCap UE.
  • WO 2022/036585 A1 discloses a UE measuring, at a first hop of a frequency-hopping scheme, a reference signal on a first sub-band of an effective reference signal bandwidth and measuring, at a second hop of the frequency-hopping scheme, the reference signal on a second sub-band of the effective reference signal bandwidth, the first and second sub-bands of the effective reference signal bandwidth overlapping in part. This enables that the UE estimates a phase difference associated with the first and second hops and compensates for the estimated phase difference on the reference signals as measured on the first and/or second sub-bands of the effective reference signal bandwidth. Further prior art documents are WO 2022/076086 A1 and US 2019/253282.
  • the transmission of the P-RSs employs a frequency-hopping pattern including multiple sub-bands.
  • the multiple sub-bands overlap in frequency domain. This enables the UE to form a virtual wideband by stitching together measurements taken on the multiple sub-bands and compensating for phase offsets. Phase offsets can be compensated for by comparing the received phases of P-RSs in different sub-bands in the respective overlap regions.
  • the overlap region in other words, is used for the calculation/estimation of the phase discontinuities / phase errors that can occur between the hopping, due to radio-frequency hardware retuning at the bandlimited UE.
  • one or more configurations of one or more repetitive transmissions of P-RS are obtained at a wireless communication node.
  • the wireless communication node can be implemented by a UE or a base station of a cellular network or a location management server of the cellular network.
  • Obtaining the one or more configurations can include loading the one or more configurations from a local memory, e.g., in case the one or more configurations are preconfigured, e.g., in accordance with a communication protocol.
  • Obtaining the one or more configurations can include obtaining a control message from another wireless communication node, e.g., via a radio link, the control message being indicative of the one or more configurations.
  • the one or more repetitive transmissions can include a first transmission that employs a frequency-hop pattern that includes multiple sub- bands.
  • the one or more repetitive transmissions can include a second transmission.
  • a bandwidth of a wideband employed by the second transmission can be wider than a bandwidth of each one of the multiple sub-bands.
  • the sub-bands can be arranged with an overlap in the frequency domain. I.e., the multiple sub-bands can be pairwise partly overlapping in frequency domain. This means that pairs of the multiple sub-bands can be allocated to common frequencies, i.e., an overlap region in frequency domain.
  • the first transmission can include multiple respective repetitions offset in time domain by, e.g., multiple time slots or subframes.
  • the second transmission can include multiple respective repetitions offset in time domain by, e.g., multiple time slots or subframes.
  • FIG. 1 schematically illustrates a transmission of P-RSs according to various examples.
  • FIG. 2 schematically illustrates positioning of a UE using multiple transmissions from multiple base stations of a cellular network according to various examples.
  • FIG. 3 schematically illustrates a wideband transmission of P-RSs and a bandlimited transmission of P-RSs, the bandlimited transmission employing a frequency-hop pattern that includes multiple sub-bands according to various examples.
  • FIG. 4 schematically illustrates a communication node such as a UE or a BS according to various examples.
  • FIG. 5 is a flowchart of a method according to various examples.
  • FIG. 6 schematically illustrates a wideband transmission of P-RSs and a bandlimited transmission of P-RSs, the bandlimited transmission employing a frequency-hop pattern that includes multiple sub-bands according to various examples.
  • FIG. 7 schematically illustrates a muting pattern for muting repetitions of a bandlimited transmission of P-RSs according to various examples.
  • FIG. 8 schematically illustrates reception of fractions of a wideband transmission of P-RSs at a UE according to various examples.
  • FIG. 9 is a signaling diagram of communication between a UE, BS, and a location management server according to various examples.
  • FIG. 10 is a flowchart of a method according to various examples. DETAILED DESCRIPTION
  • circuits and other electrical devices generally provide for a plurality of circuits or other electrical devices. All references to the circuits and other electrical devices and the functionality provided by each are not intended to be limited to encompassing only what is illustrated and described herein. While particular labels may be assigned to the various circuits or other electrical devices disclosed, such labels are not intended to limit the scope of operation for the circuits and the other electrical devices. Such circuits and other electrical devices may be combined with each other and/or separated in any manner based on the particular type of electrical implementation that is desired.
  • any circuit or other electrical device disclosed herein may include any number of microcontrollers, a graphics processor unit (GPU), integrated circuits, memory devices (e.g., FLASH, random access memory (RAM), read only memory (ROM), electrically programmable read only memory (EPROM), electrically erasable programmable read only memory (EEPROM), or other suitable variants thereof), and software which co-act with one another to perform operation(s) disclosed herein.
  • any one or more of the electrical devices may be configured to execute a program code that is embodied in a non-transitory computer readable medium programmed to perform any number of the functions as disclosed.
  • Positioning allows determining the geographic position and/or velocity of the UE based on measuring the received UL and/or DL P-RSs.
  • Location/Position estimates of the UE may be requested by and reported to a client (e.g., an application) associated with the UE, or by a client within or attached to a core network of a cellular network (NW).
  • the location estimates may be reported in standard formats, such as those for cell-based or geographical co-ordinates, together with estimated errors (uncertainty) of the position and velocity of the UE and, if available, the positioning method (or the list of the methods) used to obtain the position estimate.
  • the positioning estimates may be used internally by communication systems, such as 3GPP Long Term Evolution (LTE) cellular NWs or 5GNR cellular NWs, by value-added network services, by the UE itself or through the network, and by "third party" services.
  • LTE Long Term Evolution
  • 5GNR 5GNR
  • the functions may also be used by an emergency service, but the location service is not exclusively for emergencies.
  • the techniques disclosed herein can be generally applied to various kinds and types of cellular NWs. However, hereinafter, reference will be made to 3GPP specified cellular NWs, for illustrative purposes. Specifically, reference will be made to 3GPP NR cellular NWs.
  • P-RSs may be transmitted in the DL (e.g., 3GPP PRS, 3GPP CSI-RS) or in the UL (e.g., 3GPP SRS).
  • DL-based positioning and/or UL-based positioning can be used.
  • the DL P-RSs are transmitted by multiple BSs or transmission and reception points, TRPs, (e.g., gNBs for 3GPP NR) and can be received by a target UE to be positioned.
  • TRPs transmission and reception points
  • the UL RSs - e.g., SRSs - are transmitted by the target UE to be positioned and can be received by multiple BSs or TRPs.
  • the P-RS can be broadcasted.
  • Cell-specific P-RS can be employed.
  • Resources can be allocated to a transmission of P-RS that support multiple beams.
  • P-RSs could be arranged in an interleaved pattern (e.g., comb-N pattern) multiplexed with different transmit-receive points (TRPs) of a BS.
  • TRPs transmit-receive points
  • the P-RS from a TRP is transmitted in every Nth sub-carrier and be interleaved with the P-RS from other TRPs.
  • a UE can perform positioning measurements on multiple TRPs simultaneously.
  • PRS resource set A set of PRS resources is called PRS resource set. Within a PRS resource set, each resource can represent the transmission in different beam (also known as spatial filter) and/or repeated transmission.
  • the PRS resource set can be repeated with a periodicity of 4 ms to 10.24 sec. Thus, according to examples, a repetitive transmission of PRS is employed.
  • PRS signal is generated with a gold sequence generator as described in 3GPP Technical Specification (TS) 38.211 , Version 17.1.0, section 7.4.1.7.
  • the PRS signal is placed in a NR resource block, in certain time-frequency resource elements (RE), such that in certain sub-carrier k and Orthogonal Frequency Division Multiplex (OFDM) symbol L PRS is allocated with a certain comb-structure.
  • K_comb 4 means the PRS is allocated every fourth sub-carrier k.
  • FIG. 1 illustrates PRS resource sets 201 of the PRS transmission 200 (in the illustrated example, the PRS transmission 200 includes seven PRS resource sets 201).
  • the PRSs are allocated with a certain wideband 209.
  • the wideband 209 can cover the entire maximum carrier bandwidth of the carrier, i.e., the system bandwidth (the system bandwidth can be smaller than the maximum carrier bandwidth specified in the communication protocol, e.g., in 3GPP NR 100 MHz for Frequency Range 1 and 400 MHz for Frequency Range 2).
  • the PRS transmission 200 will thus be referred to PRS wideband transmission 200, or simply wideband transmission 200.
  • a PRS resource includes multiple PRBs .
  • Each PRB includes multiple time-frequency resource elements 208 (cf. inset of FIG. 1). The inset of FIG.
  • the comb size 205 specifying the time-frequency domain density of the time-frequency resource elements 208 allocated to the PRS transmission (in the illustrated example, the comb size 205 is four).
  • Two PRSs 251 , 252 with different offsets are allocated for two TRPs I gNBs in the example of FIG. 1.
  • the wideband transmission 200 is repetitive. Illustrated are two repetitions 611 , 612 of the wideband transmission 200.
  • the periodicity 690 is illustrated. This enables the UE to monitor for the PRS 251 , 252 multiple times, which facilitates increased positioning accuracy and/or enables the UE to monitor for the PRS 251 , 252 in different time occasion.
  • a PRS resource set 201 typically corresponds to a PRS transmission with a certain beam 131 , 132, 132.
  • the UE 121 is expected to measure multiple PRS resources from multiple BSs 111 , 112, 13.
  • the UE 121 reports the best beam (e.g., represented in the PRS resource ID) and the timing measurements to a location management server, e.g., the location management function (LMF) 115 in the 3GPP NR implementation.
  • the LMF can perform multilateration for positioning estimation.
  • Bandlimited UEs are not able to monitor for the PRS 251 , 252 across the entire wideband 209. It is now assumed that the UE 121 is a bandlimited UE. Bandlimited UEs can only monitor a fraction of wideband 209 which may reduce the positioning estimation accuracy.
  • a frequency-hop pattern including multiple-sub- bands is employed. This is illustrated in FIG. 3.
  • FIG. 3 illustrates that the wideband transmission 200 (on a wideband 209) coexists with a bandlimited transmission 300.
  • the bandlimited transmission 300 employs multiple sub-bands 311 , 312, 313, 314 that are arranged in a frequency-hop pattern 310.
  • This is a transmit frequency-hop pattern 310 employed by the BSs 111 , 112, 113 for transmitting the PRSs 251 , 252.
  • the respective frequency hops 301 , 302, 303 are illustrated.
  • the UE 121 measures (i.e. , attempts to receive PRS 251 , 252 I monitors for PRS 251 , 252), accordingly, on the sub-bands 311 prior to measuring on the sub-band 312.
  • Each one of the sub-bands 311 , 312, 313, 314 has a respective bandwidth that is smaller than the bandwidth of the wideband 209.
  • the bandlimited receiver of the bandlimited UE 121 is enables to receive signals on the sub-bands 311 , 312, 313, 314.
  • the bandwidth or bandwidths of the sub-bands 311 , 312, 313, 314 are matched to the device bandwidth of the bandlimited UE 121.
  • the UE 121 can estimate the phase offset by comparing a phase of the received PRS in a first sub-band on a given frequency with the phase of a received PRS on a second sub-band on the same given frequency, in the overlap area. This enables the UE 121 to form a virtual wideband 390. Measurements are obtained throughout a bandwidth 391 of the virtual wideband 390. This corresponds to stitching multiple sub-bands.
  • Pairwise partly overlapping in frequency domain can mean that to sub- bands are different from each other, but have an overlap region in the frequency domain.
  • sub-band A may span from frequency A to frequency B
  • sub-band B may span from frequency B-d to frequency C.
  • the overlap is d.
  • d is much smaller than the distance from A to B and the distance from B-d to C.
  • the BS transmits one or more PRSs in different sub-bands, one after another.
  • the UE monitors for the one or more PRSs in the sub-bands individually.
  • the UE combines the measurements on the one or more PRS in the sub-bands.
  • bandlimited UE This is the framework which significantly mitigates the performance loss of bandlimited UEs. For example, by stitching PRS measurements taken in five different 20MHz sub-bands, the bandlimited UE can achieve a similar performance as a wideband UE that monitors for PRSs in a 100 MHz wideband. Further details of FIG. 3, beyond this framework of using multiple sub-bands for PRS transmission will be explained below, also with reference to FIG. 4 and FIG. 5.
  • FIG. 4 schematically illustrates a communication node 90 according to various examples.
  • the communication node 90 could implement a bandlimited UE such as the UE 121 (cf. FIG. 2). It would also be possible that the communication node 90 implements a BS, e.g., one of the BSs 111 , 112, 113 that transmit the positioning reference signals 251 , 252 (cf. FIG. 2).
  • the communication node 90 includes a processor 91 and a memory 92.
  • the communication node 90 also includes an interface 93. Using the interface 93, the communication node 90 can communicate wirelessly with further communication node, using a wireless carrier, e.g., using Orthogonal Frequency Division Multiplex modulation.
  • the processor 91 can load program code from the memory 92 and execute the program code.
  • the processor 91 upon loading and executing the program code, can perform techniques as disclosed herein, e.g.: obtaining a configuration of one or more repetitive transmissions of P-RS, e.g., PRS or SRS; transmitting and/or receiving the P-RS in accordance with the configuration; participating in a positioning procedure for positioning a UE; etc.
  • FIG. 5 is a flowchart of a method according to various examples.
  • the method of FIG. 5 can be executed by a communication node, e.g., a UE or a BS of a cellular network.
  • the method of FIG. 5 could be executed by the UE 121 of FIG. 2 or it could be executed by a BS such as the BS 111 or the BS 112 or the BS 113.
  • BSs can be configured and provide the configuration to LMF. Later, LMF provides the configuration to the UE.
  • the method of FIG. 5 could be executed by the processor 91 upon loading and executing program code from the memory 92 (cf. FIG. 4).
  • a configuration or multiple configurations are obtained.
  • the configuration or the multiple configurations are for one or more repetitive transmissions of PRS. For instance, a configuration that jointly defines a bandlimited transmission and a wideband transmission can be obtained. It would also be possible to obtain multiple configurations, one for a bandlimited transmission and a further configuration for a wideband transmission.
  • Example parameters that can be set by the configuration include, e.g.: number of resource sets per frequency layer; number of PRBs; frequency-hop pattern; comb structures; sequence design of PRS; timing of repetitions of the respective transmission; etc..
  • obtaining a configuration can pertain to loading the configuration from a memory.
  • the configuration may be predefined according to a communication protocol such as 3GPP 5G NR.
  • Obtaining the configuration may, alternatively or additionally, include receiving a configuration message that is indicative of at least a part of the configuration from another communication node. For instance, at least parts of the configuration may be determined at a BS of a cellular NW and then provided, by using a respective configuration message, to one or more UEs that are served by that BS. For instance, a Radio Resource Control (RRC) control message may be used to provide the configuration(s).
  • RRC Radio Resource Control
  • Obtaining a configuration can include determining I generating the configuration.
  • the BS can determine a configuration and then provide, using a respective control message, the configuration to a UE.
  • at least parts of the configuration may be determined at a LMF of a cellular NW and then provided, by using a respective configuration message, to one or more UEs via one of the BS.
  • LPP LTE positioning protocol
  • PRS are then communicated in accordance with the one or more configurations obtained at box 3005.
  • the PRS transmission or transmissions are executed.
  • Box 3010 can include transmitting the one or more PRSs in accordance with the configuration.
  • Box 3010 can include implementing one or more repetitions of a transmission of the PRSs in accordance with the configuration.
  • Box 3010 can include attempting to receive (monitoring for) PRSs transmitted in accordance with the configuration. For instance, a UE may attempt to receive downlink PRSs and thereby participate in the transmission.
  • the BS can transmit the DL PRSs and thereby participate in the transmission.
  • the UE can implement, at box 3010, one or more positioning measurements and thereby participate in the transmission.
  • the UE can monitor for downlink PRSs on multiple sub-bands of a frequency-hopping pattern.
  • the sub-bands are pairwise overlapping (cf. FIG. 3: where the overlap region 321 in frequency domain has been illustrated).
  • a phase offset in between the adjacent sub-bands can be estimated and compensated.
  • positioning of the UE is then facilitated based on the communication of the one or more PRSs at box 3010.
  • the UE can provide a measurement report to the BS or a location management server such as a 3GPP NR LMF (cf. FIG. 2: LMF 115). Multilateration is then possible based on these measurement reports.
  • box 3005 and box 3010 will be explained.
  • FIG. 3 coexistence between the wideband transmission 200 and the bandlimited transmission 300 is possible.
  • the repetitions of the wideband transmission 200 and the repetitions of the bandlimited transmission 300 are interleaved in time domain. This means that it is possible to alternate between the wideband transmission 200 and the bandlimited transmission 300.
  • wideband UEs and bandlimited UEs can be both served.
  • the UE 121 monitors for the PRSs in a bandlimited fraction 380 of the wideband 209 of the wideband transmission 200.
  • the overall spectral efficiency can be increased.
  • the configuration can define the bandlimited fraction 380 of the wideband 209 as part of the frequency-hop pattern 310.
  • the configuration of box 3005 can include the frequency-hop pattern which includes the multiple sub-bands as well as the wideband 209.
  • the bandlimited fraction 380 has an overlap region 321 with the sub-band 311 , to compensate for phase errors.
  • legacy transmission of PRSs can be configured as the first hop of the frequency-hop pattern.
  • a bandlimited UE can start using the wideband transmission, so that fewer sub-bands are required. For instance, as illustrated in FIG.
  • the bandlimited transmission 300 includes a frequency-hop pattern 310 that includes a total of five sub-bands, were in the first sub and corresponds to the frequencies covered in FIG. 3 by the bandlimited fraction 380.
  • separate configurations are provided (cf. box 3005 of FIG. 5) for the wideband transmission 200 and the bandlimited transmission 300. This would enable to tailor the properties of the PRS bandlimited transmission 300 to the requirements of bandlimited UEs.
  • separate control messages may be used that carry the two configurations for the wideband transmission 200 as well as for the bandlimited transmission 300.
  • different PRS(s) are used for the bandlimited transmission 300 and the wideband transmission 200.
  • one or more PRSs of the bandlimited transmission 300 may have a different transmit power than one or more PRSs of the wideband transmission 200 (e.g., power boosting in bandlimited transmission 300).
  • the sequence design (e.g., different sequence identity) of the one or more PRSs of the bandlimited transmission 300 may at least partly different from the sequence design of the one or more PRSs of the wideband transmission 200.
  • the comb structure may differ between the bandlimited transmission 300 and the wideband transmission 200.
  • the length (number of symbols) of each repetition may differ between the wideband transmission 200 and the bandlimited transmission 300.
  • the number of resource sets may differ.
  • a periodicity of repetitions of the bandlimited transmission 300 is different than (in particular, smaller than) a periodicity of repetitions of the wideband transmission 200. This means that PRS are more often transmitted on the wideband 209 than on repetitions of the sub-bands.
  • different muting patterns may be used.
  • the bandlimited transmission 300 and the wideband transmission 200 are configured use at least partly the same parameters.
  • a common configuration is provided for, both, the wideband transmission 200, as well as the bandlimited transmission 300.
  • the configuration can jointly set one or more values of one or more parameters of, both, the wideband transmission 200 as well as the bandlimited transmission 300. This can reduce control signaling overhead, because fewer information elements are required to configure the bandlimited transmission 300 and the wideband transmission 200.
  • parameters for which different values can be used for the bandlimited transmission 300 and the wideband transmission 200 have been disclosed. In other examples, for such parameters the same values can be used for the bandlimited transmission 300 and the wideband transmission 200.
  • parameters that can be jointly set include a subcarrier allocation of the PRS 251 , 252, i.e., a comb structure. Further examples include a sequence design of the PRS 251 , 252. The same sequence ID may be used. It would be possible that the same muting patterns are used. The same repetition periodicity may be used. Further examples include one or more resource sets, i.e., the same count of resource sets may be used.
  • the size (i.e., number of PRB) for each sub-band 311 , 312, 313, 314 be configured for each frequency layer (configurable) or predefined (static).
  • a RedCap UE with 20 MHz bandwidth can in accommodate max 110 RBs for SCS 15 KHz.
  • the RedCap UE can be configured with other number of PRBs (not necessarily 110 RB), particularly to optimize the hopping operation related to the total bandwidth for frequency hopping operation and the overlap BW).
  • the sub-bands 311-314 of the frequency-hop pattern 310 can each have the same bandwidth or varying bandwidth.
  • the bandwidth of the sub-bands 311-314 is defined by the configuration of the bandlimited transmission 300.
  • the bandwidth of the sub-bands can be smaller than a device bandwidth of the bandlimited UE 121. This enables matching the bandwidth of the sub-bands 311-314 to the size of PRBs and tailoring the respective overlap region 321.
  • the bandlimited transmission 300 can have the same properties as the wideband transmission 200. More specifically, it is possible that the PRSs 251 , 252 transmitted as part of the bandlimited transmission 300 have the same properties as the PRSs 251 , 252 transmitted as part of the wideband transmission 200. Thus, a single configuration for the PRSs can suffice. The signaling is reduced.
  • the bandlimited transmission 300 can be configured with the same resource set as the wideband transmission 200. It would also be possible to use a fraction of the resource set of the wideband transmission 200 for the bandlimited transmission 300. For instance, if the resource set of the wideband transmission 200 has eight PRBs allocated to the PRSs 251 , 252, then the resource set of the bandlimited transmission 300 can have four PRBs allocated to the PRSs 251 , 252. Thereby, the overhead of resource-elements allocated to the PRSs by the BS can be reduced, thereby freeing up resources for other tasks.
  • A/ resource blocks of the wideband transmission can be mapped to M resource blocks of the bandlimited transmission 300. I.e., a count of time-frequency resource elements per resource set can be lower for the bandlimited transmission 300 than for the wideband transmission 200.
  • the count of time-frequency resource elements per resource set for the bandlimited transmission 300 is a fraction of the respective count for the wideband transmission 200.
  • This fraction can be indicated by the configuration obtained at box 3005 of FIG. 5.
  • the configuration can indicate the PRBs per resource set for the wideband transmission 200 and further indicate the respective fraction; thereby, the UE 122 can deduce the resource blocks per resource set for the bandlimited transmission 300 from the configuration.
  • This enables the a configuration to explicitly indicate the value for the count of time-frequency resource elements per resource set for the wideband transmission; the UE, employing the predefined mapping, can then reduce/in- fer of the value for the count of time-frequency resource elements per resource set for the bandlimited transmission 300.
  • mapping also is applicable to other parameters of the bandlimited transmission 300 and the wideband transmission 200, respectively.
  • An example would be the count of resource sets 201.
  • the configuration explicitly indicates a value of a given parameter for the wideband transmission 200; then, the respective value of the given parameter for the bandlimited transmission 300 is set based on a respective predefined mapping.
  • the mapping can be indicated by the configuration, e.g., can be communicated from the BS to the UE or from the LMF to the UE; alternatively it would be possible that the mapping is specified by a communication protocol used for communicating on the wireless carrier, i.e., is predefined according to the communication standard.
  • the mapping can be from the wideband transmission 200 to the bandlimited transmission 300, or vice versa.
  • a mapping 900 (cf. inset of FIG. 6) is defined between the number of resource sets 201 used for the wideband transmission 200 and the bandlimited transmission 300.
  • the count of resource sets 201 for the bandlimited transmission 300 can be obtained by multiplying the count of resource sets 201 for the wideband transmission 200 by a fraction that is given by the count of PRBs of a repetition of the wideband transmission 200 divided by a count of PRBs of a repetition of the bandlimited transmission 300.
  • time gaps 325 between the wideband 209 and the sub-band 311 , as well as time gaps 322 between adjacent ones of the sub-band 311-314.
  • these time gaps 322, 325 are all dimensioned alike. Different time gaps can be used depending on the numerology of the PRS transmission.
  • the duration of a time gap can expressed as a number of slots of the communication protocol.
  • a slot includes a predefined number of symbols of an OFDM modulation.
  • the configuration can specify one or more such time gaps 322 in between parts of the repetitive transmission 200. Alternatively or additionally, the configuration can specify the time gap 325 in between the wideband transmission 200 and the repetitive transmission 300.
  • time gaps 322, 325 By appropriately configuring the time gaps 322, 325, it is possible to enable the UE 120 121 to retune its RF receiver (or RF transmitter, for UL P-RSs). At the same time, scheduling strategies can be implemented, to accommodate further transmissions different than the wideband transmission in the bandlimited transmission 300.
  • the time gap 322 and/or the time gap 325 is specified, by the configuration, as a function of the subcarrier spacing of the carrier.
  • a larger subcarrier spacing (SCS) can have a shorter duration of the time gap 322 and/or of the time gap 325, and vice versa.
  • 15 kHz SCS has 1 time slot and 60 kHz has 4 time slots.
  • This kind of configuration can be predefined in the specifications. For example, a table representing the time-gap depending on the NR numerology parameter (i.e. , SCS).
  • SCS NR numerology parameter
  • the time gaps 322 may be configured as part of the configuration of the frequency-hop pattern 310.
  • the configuration can be indicative of the frequency-hop pattern 310.
  • the frequency offset between the sub-bands 311 , 312, 314, 315 of the various hops with respect to each other or with respect to a common reference frequency can be defined.
  • the center frequency 706 of the sub-band 312 - corresponding to the second hop - is defined with respect to the reference frequency 701 that is defined with respect to the sub-band 311 (lower frequency thereof).
  • the center frequency 702 of the sub-band 313 can be defined with respect to the frequency 705, which is the lower frequency of the sub-band 312 of the preceding hop.
  • a common reference frequency e.g., the lower edge of the system bandwidth is used to define the frequencies of the sub-bands 311-314.
  • the configuration can be indicative of the frequencies (i.e., the frequency range occupied by that sub-band) of a given subagent by indicating a relative frequency shift with respect to a reference frequency, e.g., that is defined with respect to a further sub band or globally defined for all sub-bands alike.
  • the frequency offsets in between adjacent sub-bands 311-314 are uniform.
  • the configuration is indicative of a variation of the frequency offset from subband to sub-band.
  • the relative frequency offset between the hops 301-303 of the frequency-hop pattern 310 can thus be configurable.
  • Such variation of a value of a parameter from sub-band to sub-band is not limited to the frequency offsets.
  • Other parameters that can vary from sub-band to sub-band include the number of time-frequency resources, e.g., PRBs or REs, allocated to the PRS per sub-band, e.g., by defining the number of resource sets 201 and/or by defining the comb structure.
  • the size of overlap region 321 is fixed, e.g., a single PRB or a certain fraction thereof. It would also be possible that the size of the overlap region 321 is varied. For instance, the number of REs defining the overlap region can vary as a function of the comb size and the number of symbols per slot.
  • the configuration can be indicative of the overlap bandwidth (i.e., the frequency-domain extension/size of the overlap region 321) that can be defined based on (i.e., as a function of) the frequency domain density of the time-frequency resource elements allocated to the PRS.
  • the time-frequency REs 208 within the overlapping region 321 may not be fully occupied by the PRS from a given gNB/TRP. Only the occupied REs 208 in the overlap can be effectively used for phase error calibration.
  • the number of effective RE 208 in the overlap can be calculated by:
  • L oRE is the number of overlap effective resource elements
  • L oPRB is the number of overlap physical resource block
  • L PRS is the number of the occupied PRS symbols per slot
  • ⁇ comb i s comb size For DL-PRS configuration, only these ⁇ L PRS ,/f c R S b ⁇ combinations can be selected: ⁇ 2, 2 ⁇ , ⁇ 4, 2 ⁇ , ⁇ 6, 2 ⁇ , ⁇ 12, 2 ⁇ , ⁇ 4, 4 ⁇ , ⁇ 12, 4 ⁇ , ⁇ 6, 6 ⁇ , ⁇ 12, 6 ⁇ and ⁇ 12, 12 ⁇ .
  • the number of overlapping PRBs L oPRB can be dynamically adapted to ensure the number of effective RE L oRE maintain the same for different comb structures.
  • the following is the table listing all the possible L oPRB in different ⁇ L PRS ,
  • Table 1 The number of overlapping physical resource block L oPRB as a function of ⁇ L PRS , K 0 R m b ⁇
  • the total amount of overlapping effective RE is always 72N. This helps to reliably compensate for the phase error.
  • the frequency-hop pattern is static.
  • the frequency-hop pattern can be pre-configured.
  • the frequency-hop pattern can be is defined in the specification of the communication protocol (e.g., always four hops at a certain overlap and certain frequencies). Hence, no dedicated signaling is required to signal the respective (part of the) configuration.
  • the frequency-hop pattern is configurable: Multiple possible patterns can be predefined.
  • the network e.g., the LMF 115
  • it would be possible to provide the configuration that is indicative of one or more values of one or more parameters of the frequency-hop pattern by including a codebook index of a predefined codebook of a plurality of predefined candidate frequency-hop patterns. This reduces the control signaling overhead required to signal the configuration.
  • the codebook can, accordingly, include multiple entries which are associated with different frequency-hop patterns. By indicating the particular entry of the codebook, a specific frequency-hop pattern can be selected. Next, details with respect to muting repetitions of the bandlimited transmission 300 are disclosed.
  • the configuration can specify, e.g., periodic repetitions or, more generally, multiple repetitions of the bandlimited transmission 300. Then, after configuring, some of these repetitions are skipped. Thereby, the spectral allocation of PRS can be reduced.
  • the configuration of the bandlimited transmission 300 can, accordingly, specify whether one or more of the multiple repetitions of the bandlimited transmission 300 are muted. This is illustrated in FIG. 7.
  • FIG. 7 illustrates multiple repetitions 601-603 of the bandlimited transmission 300, as well as multiple repetitions 611-613 of the wideband transmission 200.
  • periodic muting is possible.
  • the periodicity of the PRSs being transmitted using the bandlimited transmission 300 can thus be longer than the periodicity of the PRSs being transmitted using the wideband transmission 200.
  • this can be a feasible option, because a latency requirement associated with the positioning can be relaxed. This can be due to, e.g., reduced mobility of such devices, such as loT device.
  • the configuration can include a repetitive muting pattern that specifies the periodicity of the muting of the repetitions.
  • the bandlimited transmission can be aperiodically muted.
  • the configuration can include an aperiodic muting command that specifies individual repetitions 601 , 602, 603 to be muted.
  • muting in accordance with a muting pattern is triggered by an aperiodic command.
  • the muting pattern may specify certain periodicity of muting and this may be preconfigured and subsequently activated by a respective command.
  • a transmitter-side frequency hop pattern is not required in all scenarios.
  • the UE may implement, at the receiver side, a frequency-hop pattern.
  • the wideband transmission 200 is repeated (repetitions 611 , 612, 613, 614) and the UE 121 can monitor different fractions 381 , 382, 383, 384 of the respective wideband in subsequent repetitions 611 , 612, 613, 614.
  • Examples disclosed above with respect to the configuration of the transmitter-side frequency hop pattern 310 are also applicable to the receiver-side frequency-hop pattern, e.g., with respect to the overlap region 321 , etc..
  • FIG. 9 is a signaling diagram of communication between the bandlimited UE 121 , the serving BS 111 and the further BSs 112, 113, as well as the LMF 115.
  • the serving BS determines the PRS configuration, for, both, the wideband transmission 200, as well as the bandlimited transmission 300. Box 5005, accordingly, implements box 3005, for the BS perspective.
  • the PRS configuration is (at least partly) determined at the LMF 115. It would also be possible that at least parts of the PRS configuration are determined at the UE 121.
  • the BS 111 then provides, at 5015, the configuration 70 to the LMF 115 using a respective positioning protocol control message 4010 which is (optionally) triggered by a respective request 4005 provided by the LMF 152 the BS 111 at 5010.
  • the UE 121 provides its capability or capabilities associated with the monitoring for PRSs in a respective control message 4015 to the LMF 115.
  • the UE 121 may indicate whether it can monitor a bandlimited PRS transmission such as the PRS transmission 300 on multiple sub-bands.
  • the UE can indicate whether it can perform a virtual bandwidth calculation, e.g., including compensation for phase offsets based on a phase comparison between PRS received on different sub-bands in the same overlap region.
  • a higher number of sub-bands will increase the UE complexity.
  • the UE could also indicate that it is not capable of a virtual bandwidth calculation; in which the positioning could be restricted to PRS received on a single sub-band.
  • the UE 121 is capable of performing a virtual bandwidth calculation; and, accordingly, the LMF 115 provides, at 5025, in a respective control message 4020, the configuration 70 to the UE 121. Thereby, the UE 121 obtains the configuration 70.
  • one or more PRS are transmitted in the respective PRS transmissions 200, 300 at 5035 and the UE monitors for the PRSs 251 , 252.
  • the BS 111 and the UE 121 participate in the PRS transmissions 200, 300.
  • the UE 121 implements respective PRS measurements at 5040.
  • the UE implements the PRS measurements on multiple subbands of the frequency-hop pattern of the bandlimited PRS transmission 300.
  • the UE then provides a measurement report message 4030 to the LMF 115.
  • This can include a dedicated information element associated with PRS measurements on the bandlimited transmission 300.
  • the LMF 115 can position the UE.
  • a collision occurs in between the PRS transmissions 200, 300, specifically the bandlimited PRS transmission 300, and a further transmission.
  • Further transmissions could be, e.g., synchronization signal block, tracking reference signal, or common search space transmissions, data transmission, particularly data for ultra-reliable and low latency communication (URLLC) application.
  • URLLC ultra-reliable and low latency communication
  • the UE can execute PRS measurements and based on the PRS measurements determine that the PRS transmission is interfered or missing (i.e. , no PRS present).
  • the BS could indicate the collision by means of a collision indicator that is signaled.
  • a Layer 1 indication can be provided in a Downlink Control Information (DCI).
  • DCI Downlink Control Information
  • various actions can be taken to mitigate the collision. For instance, a portion or the entire repetition of the bandlimited PRS transmission 300 can be dropped or postponed in time domain. Muting could be applied (cf. FIG. 7). It would also be possible to rearrange the frequency-hop pattern, e.g., from frequency-ascending order (cf. FIG. 3) to frequency-descending order.
  • a collision indicator is provided from the BS 111 to the UE 121 or from the LMF 115 to the UE 121. This collision indicator can be indicative of another transmission taking place in the PRBs or REs that have been pre-allocated to the repetitive bandlimited transmission 300. Then, an adjustment of at least one of the timing or the frequency-hop pattern of the repetitive bandlimited transmission 300 can be indicated and executed.
  • the UE can be explicitly informed of such rearrangement of the frequency hop-pattern. If the UE is not informed of such collision, the UE could also indicate in its measurement report that the measurement is affected or corrupted by the collision. For illustration, at box 5040, when the UE executes the PRS measurement, the UE may at some point decide to drop the PRS measurement, either partly or entirely, for a given sub-band of a given repetition of the bandlimited PRS transmission. This can be responsive to detecting a collision in the respective sub-band. Where the PRS measurement is partly dropped, i.e., some values that are determined based on receive properties of the PRS transmitted in the respective sub-band are used, this could also be indicated in the measurement report. FIG.
  • FIG. 10 is a flowchart of a method according to various examples.
  • the method of FIG. 10 can be executed by a wireless communication node such as a BS, e.g., the serving BS of a bandlimited UE.
  • the method of FIG. 10 could be executed by the BS 111 .
  • the method of FIG. 10 could be executed by the processor 91 upon loading program code from the memory 92 and upon executing the program code.
  • the method of FIG. 10 illustrates aspects in connection with obtaining a configuration of a repetitive transmission. More specifically, the method of FIG. 10 illustrates aspects in connection with obtaining configurations for a repetitive bandlimited PRS transmission as well as for a repetitive wideband PRS transmission such as the bandlimited transmission 300 and the wideband transmission 200.
  • the BS determines a configuration for the wideband PRS transmission. This can include setting values for parameter such as: periodicity; count of resource sets; muting pattern; sequence ID of the PRS; comb structure. Thereby, the BS obtains the configuration.
  • the BS transmits a respective configuration message that is indicative of the configuration that has been determined at box 3105.
  • the configuration message could be transmitted directly to the UE or through a location management server such as a 3GPP LMF.
  • the UE receives the configuration message and thereby obtains the configuration.
  • the BS determines a further configuration for the bandlimited PRS transmission. This can be responsive to a need to provide the bandlimited PRS transmission, e.g., because one or more bandlimited UEs have requested positioning.
  • At least one value differs for one or more parameters in between the bandlimited PRS transmission and the wideband PRS transmission. It is also possible that all values differ.
  • the configuration determined at box 3115 can, furthermore, include the configuration of the frequency-hop pattern.
  • This can include one or more parameters such as: count of sub-bands; frequencies of sub-bands; overlap between sub-bands; time gap in between sub-bands; sequence of sub-bands.
  • the configuration of the frequency hop pattern can also be predetermined, e.g., in the communication protocol.
  • it would be possible that the frequency-hop pattern is configured by relying on a codebook of candidate frequency-hop patterns. This can be a table of candidate configurations for the frequency-hop pattern in the respective index can then be signaled.
  • the BS transmits another configuration message that is indicative of the configuration that has been determined at box 3115. For instance, it would be possible that the configuration message only indicates the values of those one or more parameters that differ between the bandlimited transmission and the wideband transmission. Thus, per default, values for the bandlimited PRS transmission can be inherited from the wideband PRS transmission.
  • the configuration message at box 3120 can thus be seen as an "incremental update" of values of one or more parameters using the wideband PRS transmission as reference. This is particularly useful if the bandlimited PRS transmission of the wideband PRS transmission have repetitions that are interleaved in time domain.
  • the method of FIG. 10 is only one example of configuring the bandlimited PRS transmission.
  • all parameters of the bandlimited PRS transmission may be pre-config- ured in accordance with a communication protocol. In such a scenario, it is not required to transmit configuration messages.
  • the configuration can be obtained by loading the configuration from a memory.
  • preconfigured mappings may exist from values of the wideband PRS transmission to values of the bandlimited PRS transmission; such a case, it may not be required to transmit the configuration message at box 3120, because the UE can infer the respective values of the parameters of the bandlimited PRS transmission from the values of the respective parameters of the wideband PRS transmission, using the mapping.
  • a bandlimited transmission of one or more P-RSs is provided using a frequency-hopping pattern that includes multiple sub-bands. There is an overlap in-between adjacent sub-bands in frequency domain. A time gap is provided in-between adjacent sub-bands, providing time for a receiver of the UE to retune.
  • the bandwidth of the sub-bands of the frequencyhopping pattern can be configured, e.g., by a BS.
  • the bandwidth of the sub-bands are static, e.g., predefined in accordance with the communication protocol.
  • a bandlimited transmission of one or more PRSs can comple- ment/coexist with a wideband transmission of one or more PRSs. This means that multiple repetitions of the bandlimited transmission can be interleaved in time domain with multiple repetitions of the wideband transmission.
  • details with respect to the frequency-hopping operation have been disclosed. For instance, details with respect to the frequency arrangement or specifically the starting frequency of the sub-bands of the frequency-hopping pattern have been disclosed. For instance, the frequencies could be fixed or could be configurable, e.g., by the BS.
  • the indexing of the sub-bands of the frequency-hopping pattern have been disclosed. Techniques have been disclosed that enable to flexibly reconfigure a frequency-hopping pattern, to thereby avoid collisions with further transmissions.
  • the amount of overlap can be configured and/or can be a function of the configuration of the bandlimited transmission or the PRSs, e.g., can be a function of the comb size.
  • various examples have been disclosed in the context of an example where downlink PRSs are employed for positioning a UE.
  • the techniques described herein can be like- wise applied to uplink P-RSs transmitted by a UE and received by multiple BSs, e.g., UL SRS.
  • the measurement reports are not provided by the UE to a location management server; but, rather, the measurement reports are provided by the BSs that receive the uplink positioning reference signals.

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

Abstract

Une transmission répétitive (300) de signaux de référence permettant de positionner un terminal sans fil utilise de multiples sous-bandes (311, 312, 313, 314) qui se chevauchent partiellement (321).
PCT/EP2023/076548 2022-09-30 2023-09-26 Positionnement par transmission de signal de référence de positionnement au moyen d'un motif de saut de fréquence WO2024068632A1 (fr)

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