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WO2021144026A1 - Dispositif client pour effectuer une recherche de cellule hors couverture lorsqu'il est configuré pour une liaison latérale - Google Patents

Dispositif client pour effectuer une recherche de cellule hors couverture lorsqu'il est configuré pour une liaison latérale Download PDF

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Publication number
WO2021144026A1
WO2021144026A1 PCT/EP2020/051006 EP2020051006W WO2021144026A1 WO 2021144026 A1 WO2021144026 A1 WO 2021144026A1 EP 2020051006 W EP2020051006 W EP 2020051006W WO 2021144026 A1 WO2021144026 A1 WO 2021144026A1
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WIPO (PCT)
Prior art keywords
client device
frequency range
cell search
communication
configuration
Prior art date
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Ceased
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PCT/EP2020/051006
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English (en)
Inventor
Bengt Lindoff
Gustaf Claeson
Taimoor ABBAS
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to PCT/EP2020/051006 priority Critical patent/WO2021144026A1/fr
Publication of WO2021144026A1 publication Critical patent/WO2021144026A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/005—Discovery of network devices, e.g. terminals

Definitions

  • the disclosure relates to a client device for performing cell search in out-of coverage when configured for sidelink. Furthermore, the disclosure also relates to a corresponding method and a computer program.
  • Proximity Services (ProSe), first introduced in Release 12 of the 3rd Generation Partnership Project (3GPP) specifications, is a Device-to-Device (D2D) technology that allows devices to detect each other and to communicate directly without communication signals passing through a base station or any other network control device of a communication system.
  • D2D Device-to-Device
  • SL sidelink
  • Sidelink was introduced in long term evolution (LTE) and supports direct communication in the dedicated unlicensed intelligent transportation system (ITS) spectrum for vehicle-to-anything (V2X) services in the 5.9GHz band.
  • ITS dedicated unlicensed intelligent transportation system
  • V2X vehicle-to-anything
  • new radio (NR) sidelink Compared to LTE, which supports broadcast mode communication, new radio (NR) sidelink shall in addition support unicast and groupcast mode communication.
  • NR sidelink supports both operating scenarios where the spectrum for direct communication may be licensed spectrum and as well as the dedicated unlicensed ITS spectrum.
  • V2X communication which is a part of the ProSe, is one of the key enablers for future cooperative intelligent transportation systems (C-ITS).
  • V2X communication is a concept referring to the communication between a vehicle and any other entity on or along the road. V2X uses two modes of communication dependent on the coverage scenario; communication over sidelink, and communication over the Uu interface, the latter interface being the interface between a user equipment (UE) and a base station in LTE and NR.
  • UE user equipment
  • V2X communication is communication in a platoon of vehicles.
  • a platoon of vehicles communicating with each other may move between different coverage scenarios in a cellular system.
  • a UE operating in NR and being in-coverage of a next generation Node B may perform sidelink communication on resources configured by the gNB.
  • the UE may also have a connection to the gNB via the Uu interface.
  • An objective of embodiments of the disclosure is to provide a solution which mitigates or solves the drawbacks and problems of conventional solutions.
  • the above mentioned and other objectives are achieved with a first client device for a communication system, the first client device being configured with a frequency range for sidelink communication with one or more second client devices, and further being configured to obtain a configuration indicating a cell search frequency range, wherein the cell search frequency range is associated with the frequency range for sidelink communication; and perform a cell search procedure according to the configuration in the indicated cell search frequency range upon determining that the first client device is out-of coverage.
  • That the first client device is out-of coverage can in this disclosure be understood to mean that there is no network access node, such as a gNB, that is in control of the first client device.
  • a network access node such as a gNB
  • An advantage of the first client device according to the first aspect is that the cell search frequency range allows the first client device to perform a cell search in a controlled frequency range and thus the interference from sidelink communication can be controlled in the system. This is especially the case when the first client device returns into cellular network coverage or comes back into an area where the cellular network is operating on the same or overlapping frequencies as used for sidelink communication.
  • the cell search frequency range at least partially overlaps with the frequency range for the sidelink communication, or the cell search frequency range at least partially overlaps with a frequency range for Uu interface communication associated with the frequency range for the sidelink communication.
  • the cell search frequency range may be associated with the sidelink communication and further it may overlap with frequencies used by the network access node, and hence in case the first client device goes in-coverage the sidelink communication on pre-configured resources may interfere with the communication in a cell.
  • the frequency range for sidelink communication is within an operator managed spectrum.
  • An advantage with this implementation form is reduced risk of interference from the sidelink communication on operator managed spectrums over the Uu interface.
  • obtaining the configuration comprises at least one of obtaining the configuration based on a pre-defined rule; obtaining the configuration based on a pre-configuration in a mobile equipment, ME, or a universal integrated circuit card, UICC, of the first client device; obtaining the configuration based on signaling of a network access node; and obtaining the configuration based on signaling of the one or more second client devices.
  • the mobile equipment can herein be understood as the first client device.
  • the cell search frequency range can be obtained by the first client device in various ways improving robustness for obtaining the cell search frequency range. Further, the first client device can perform cell search in a suitable frequency range and hence interference from sidelink communication is reduced or eliminated.
  • determining that the first client device is in the out-of coverage is based on at least one of: a radio link failure procedure, a higher layer state, and control signaling from the one or more second communication devices.
  • performing the cell search procedure according to the configuration in the cell search frequency range comprises performing the cell search procedure in the cell search frequency range according to a time constraint.
  • the time constraint may e.g. be the longest allowed time for finding a network access node after entering in coverage or a periodicity defining a pattern for performing the cell search.
  • the time constraint is dependent on a pre-defined time constraint and the cell search frequency range.
  • An advantage with this implementation form is improved interference behaviour in the communication system and reduced risk of degrading the cellular system capacity and performance.
  • the configuration further indicates at least one of: the time constraint and the pre-defined time constraint.
  • An advantage with this implementation form is improved interference behaviour in the communication system and reduced risk of degrading the cellular system capacity and performance.
  • the configuration is valid for an area.
  • the area may e.g. be a spatial area or a geographical area. That the configuration is valid for an area can be understood to mean that the obtained configuration or part of the configuration is applicable for and allowed to be used in said area.
  • An advantage with this implementation form is that well defined rules for performing cell search are configured, and thereby the interference behaviour from sidelink communication will be well defined and deterministic.
  • the configuration further indicates the valid area.
  • An advantage with this implementation form is that first client device knows where to perform cell search and by that reduced interference risk from the sidelink communication.
  • the first client device is configured to signal to the one or more second client devices that the first client device is in the out-of coverage.
  • An advantage with this implementation form is that other client devices in a group are aware that the first client device is out-of-coverage, and thereby are aware of the risk for out-of- coverage. Robustness in the sidelink communication is thereby achieved.
  • the first client device is configured for at least one of: unicast communication, groupcast communication, and broadcast communication.
  • An advantage with this implementation form is that embodiments of the disclosure can be used in all kinds of sidelink communication unifying the cell search procedures over different use cases and by that reduce complexity of client device implementation.
  • the sidelink communication is vehicle-to-anything communication.
  • An advantage with this implementation form is that embodiments of the disclosure can be used in V2X communication thereby improving robustness and reliability of the V2X communication and further increase vehicle safety.
  • the sidelink communication is based on new radio, NR, or long-term evolution, LTE, radio access technology.
  • being in the out- of coverage comprises being in out-of-service over a Uu interface.
  • the above mentioned and other objectives are achieved with a method for a first client device, the first client device being configured with a frequency range for sidelink communication with one or more second client devices, the method comprising obtaining a configuration indicating a cell search frequency range, wherein the cell search frequency range is associated with the frequency range for sidelink communication; and performing a cell search procedure according to the configuration in the indicated cell search frequency range upon determining that the first client device is in out-of coverage.
  • an implementation form of the method comprises the features of the corresponding implementation form of the first client device.
  • the disclosure also relates to a computer program, characterized in program code, which when run by at least one processor causes said at least one processor to execute any method according to embodiments of the disclosure.
  • the disclosure also relates to a computer program product comprising a computer readable medium and said mentioned computer program, wherein said computer program is included in the computer readable medium, and comprises of one or more from the group: ROM (Read-Only Memory), PROM (Programmable ROM), EPROM (Erasable PROM), Flash memory, EEPROM (Electrically EPROM) and hard disk drive.
  • - Fig. 1 shows a client device according to an embodiment of the disclosure
  • - Fig. 2 shows a method fora client device according to an embodiment of the disclosure
  • FIG. 3 shows a wireless communication system according to an embodiment of the disclosure
  • Fig. 4a and 4b show coverage scenarios for sidelink communication according to embodiments of the disclosure
  • Fig. 5 shows a flow chart of an embodiment of the disclosure.
  • FIG. 6 shows an exemplary implementation of an embodiment of the disclosure.
  • a UE communicating directly with another UE over sidelink may potentially interfere with communication over the Uu interface since overlapping frequencies may be used in NR.
  • a UE in NR moves out-of coverage (OoC) of a gNB, i.e. the connection is lost over the Uu interface with the gNB and no service is provided
  • sidelink communication may be made on pre-configured resources.
  • the UE may interfere with other communication within the cell of the second gNB.
  • the inventors have realized that the UE needs to perform a cell search in order to quickly detect and connect to the second gNB, and to receive from the newly detected second gNB new resources for sidelink communication.
  • Resources can herein be understood as time and frequency resources.
  • the UE when communicating in NR, the UE does not know the frequency range for performing the cell search. Further, the UE does not know the system bandwidth of the second gNB nor the frequency on which the second gNB transmits synchronization signal blocks (SSB) for cell synchronization due to SSB position flexibility in NR.
  • the SSB frequency in the second gNB may further not overlap with the sidelink resources pre-configured in the UE, and hence performing cell search on frequency resources used for the sidelink communication is not sufficient.
  • Fig. 1 shows a first client device 100 according to an embodiment of the disclosure.
  • the first client device 100 comprises a processor 102, a transceiver 104 and a memory 106.
  • the processor 102 may be coupled to the transceiver 104 and the memory 106 by communication means 108 known in the art.
  • the first client device 100 may further comprise an antenna or antenna array 110 coupled to the transceiver 104, which means that the first client device 100 may be configured for wireless communications in a wireless communication system.
  • first client device 100 may be configured to perform certain actions can in this disclosure be understood to mean that the first client device 100 comprises suitable means, such as e.g. the processor 102 and the transceiver 104, configured to perform said actions.
  • the first client device 100 in this disclosure includes but is not limited to: a UE such as a smart phone, a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device having a wireless communication function, a computing device or another processing device connected to a wireless modem, an in-vehicle device, a wearable device, an integrated access and backhaul node (IAB) such as mobile car or equipment installed in a car, a drone, a device-to- device (D2D) device, a wireless camera, a mobile station, an access terminal, an user unit, a wireless communication device, a station of wireless local access network (WLAN), a wireless enabled tablet computer, a laptop-embedded equipment, an universal serial bus (USB) dongle, a wireless customer-premises equipment (CPE), and/ora chipset.
  • IOT Internet of things
  • the UE may further be referred to as a mobile telephone, a cellular telephone, a computer tablet or laptop with wireless capability.
  • the UE in this context may e.g. be portable, pocket- storable, hand-held, computer-comprised, or vehicle-mounted mobile device, enabled to communicate voice and/or data, via the radio access network, with another entity, such as another receiver or a server.
  • the UE can be a station (STA), which is any device that contains an IEEE 802.11 -conformant media access control (MAC) and physical layer (PHY) interface to the wireless medium (WM).
  • STA station
  • the UE may also be configured for communication in 3GPP related LTE and LTE-Advanced, in WiMAX and its evolution, and in fifth generation wireless technologies, such as NR.
  • the processor 102 of the first client device 100 may be referred to as one or more general- purpose central processing units (CPUs), one or more digital signal processors (DSPs), one or more application-specific integrated circuits (ASICs), one or more field programmable gate arrays (FPGAs), one or more programmable logic devices, one or more discrete gates, one or more transistor logic devices, one or more discrete hardware components, and one or more chipsets.
  • CPUs general- purpose central processing units
  • DSPs digital signal processors
  • ASICs application-specific integrated circuits
  • FPGAs field programmable gate arrays
  • programmable logic devices one or more discrete gates, one or more transistor logic devices, one or more discrete hardware components, and one or more chipsets.
  • the memory 106 of the first client device 100 may be a read-only memory, a random access memory, or a non-volatile random access memory (NVRAM).
  • NVRAM non-volatile random access memory
  • the transceiver 104 of the first client device 100 may be a transceiver circuit, a power controller, an antenna, or an interface which communicates with other modules or devices.
  • the transceiver 104 of the first client device 100 may be a separate chipset or being integrated with the processor 102 in one chipset. While in some embodiments, the processor 102, the transceiver 104, and the memory 106 of the first client device 100 are integrated in one chipset.
  • the first client device 100 may be configured with a frequency range for sidelink communication with one or more second client devices 300a, 300b..., 300n.
  • the first client device 100 may further be configured to obtain a configuration indicating a cell search frequency range.
  • the cell search frequency range is associated with the frequency range for sidelink communication.
  • the first client device 100 is further configured to perform a cell search procedure according to the configuration in the indicated cell search frequency range upon determining that the first client device 100 is out-of coverage.
  • Fig. 2 shows a flow chart of a corresponding method 200 which may be executed in a first client device 100 (such as the one shown in Fig. 1) configured with a frequency range for sidelink communication with one or more second client devices 300a, 300b..., 300n.
  • the method 200 comprises obtaining 202 a configuration indicating a cell search frequency range.
  • the cell search frequency range is associated with the frequency range for sidelink communication.
  • the method 200 further comprises performing 204 a cell search procedure according to the configuration in the indicated cell search frequency range upon determining that the first client device 100 is in out-of coverage.
  • Fig. 3 shows a wireless communication system 500 according to an embodiment of the disclosure.
  • the wireless communication system 500 comprises a first client device 100 and one or more second client devices 300a, 300b..., 300n, and all the client devices are configured to operate in the wireless communication system 500.
  • the first client device 100 and the set of second client devices 300a, 300b..., 300n may be UEs.
  • the wireless communication system 500 may further comprise one or more network access nodes 550, with which one or more of the first client device 100 and the set of second client devices 300a, 300b..., 300n may communicate when in-coverage of a cell 520 of a network access node 550 via the Uu interface.
  • the wireless communication system 500 comprises one network access node 550.
  • the network access node 550 in this disclosure includes but is not limited to: a NodeB in wideband code division multiple access (WCDMA) system, an evolutional Node B (eNB) or an evolved NodeB (eNodeB) in LTE systems, or a relay node or an access point, or an in-vehicle device, a wearable device, or a gNB in the fifth generation (5G) networks.
  • WCDMA wideband code division multiple access
  • eNB evolutional Node B
  • eNodeB evolved NodeB
  • gNB fifth generation
  • the first client device 100 is, according to embodiments, configured for at least one of unicast communication, groupcast communication, and broadcast communication with the one or more second client devices 300a, 300b..., 300n, e.g. over sidelink communication interfaces 510a, 510b, ...51 On.
  • the sidelink communication may be used for V2X services or applications.
  • the sidelink communication can be V2X communication.
  • the sidelink communication can be based on NR or LTE radio access technology (RAT).
  • RAT radio access technology
  • Fig. 4a and 4b show examples of different coverage scenarios applicable for a first client device 100, such as the one shown in Fig. 1 , engaged in sidelink communication.
  • the scenarios are set in a NR/LTE context hence the terminology and system design that may be used and referenced. Therefore, a client device can be considered as a UE and a network access node as a gNB.
  • embodiments of the disclosure are not limited thereto.
  • the sidelink communication may be broadcast, unicast, or groupcast as previously mentioned.
  • at least one second client device 300 is involved in sidelink communication with the first client device 100.
  • Groupcast communication is simultaneous data transmission to a group of client devices.
  • Fig. 4a and 4b show a first client device 100 and a second client device 300.
  • the coverage scenarios may comprise any number of the first client devices 100 and second client devices 300a, 300b, ...300n.
  • Fig 4a shows an in-coverage scenario in a communication system 500 in which resources used for sidelink communication may be controlled by the network access node 550 over the Uu interface.
  • the network access node 550 may assign specific resources to a transmitting client device, such as the first client device 100, or may assign a pool of resources from which the transmitting client device selects. In this way, any interference with cellular traffic can be avoided and in addition the sidelink communication may be optimized.
  • out-of coverage may in embodiments be understood that at least one of the first client device 100 and the second client device 300 has no service over the Uu interface to any RAT or public land mobile network (PLMN).
  • PLMN public land mobile network
  • out-of coverage needs be interpreted carefully. It does not have to mean that there is no coverage at all. It may in embodiments mean that there is no Uu interface coverage on frequencies used for or associated to the sidelink communication, although the first client device 100 might be in-coverage and hence have Uu interface service of a different carrier, A, for cellular traffic, where this carrier, A, does not use nor control the frequencies used for the sidelink communication.
  • the first client device 100 may use pre-configured resources for sidelink communication in out-of-coverage.
  • the resources may be pre-configured either in the mobile equipment (ME) or in the universal subscriber identity module (USIM) of the universal integrated circuit card (UICC).
  • Fig. 5 shows a flow chart of a method 600 for performing a cell search according to embodiments of the disclosure.
  • the method 600 may be performed in a first client device 100 such as the one shown in Fig. 1.
  • the first client device 100 may be configured for sidelink communication, and a first set of radio resources has been configured for sidelink communication in case the sidelink communication takes place in out-of cellular network coverage.
  • the sidelink communication may be broadcast, or unicast, or groupcast as previously mentioned, and in the two latter cases at least one second client device 300a, 300b, ... , 300n is involved in the sidelink communication and may also perform transmission.
  • Out-of cellular coverage may here mean that at least one of the first client device 100 or the at least one or more of the second device 300a, 300b, ... , 300n has no service over Uu interface to any RAT or PLMN.
  • the first set of radio resources may be configured by a network access node 550 of a radio access network (RAN), or may be pre-configured. Resources may be pre-configured in the UICC or in the ME of the first client device 100.
  • RAN radio access network
  • a USIM resides on the UICC and the ME and the USIM together form a UE.
  • the resources may be determined from a pre-defined rule such as the NR 3GPP standard.
  • information about a geographical position of the first client device 100 may be used to determine the first set of radio resources.
  • the first set of radio resources may be a set of resources in frequency and time.
  • the first set of radio resource may be an operator managed radio resource set which in some embodiments may be radio resources in a licensed radio spectrum.
  • the frequency range for the sidelink communication may be within an operator managed spectrum.
  • the first client device 100 obtains a configuration associated with a frequency range or a set of frequency ranges where the first client device 100 should perform cell search when out-of coverage is detected.
  • Cell search is generally a procedure where a client device scans for new cell identities, i.e. scans for synchronization signal transmitted from the network access nodes to find the network access node and hence the network of a communication system 500.
  • the synchronization signal may comprise primary synchronization signal (PSS), secondary synchronization signal (SSS), and synchronization signal blocks SSB depending on RAT.
  • the configuration indicating a cell search frequency range may be obtained from a network access node 550, for instance at a time when the first client device 100 was in-coverage, i.e. had service over the Uu interface in connected mode.
  • the configuration may also be obtained in idle mode, for instance from system information broadcast (SIB).
  • SIB system information broadcast
  • the configuration indicating a cell search frequency range may be obtained from a pre-defined rule, such as the NR 3GPP standard, or be a pre-defined rule based on the first radio resources possibly in combination with the NR standard.
  • the first client device 100 obtains the configuration indicating a cell search frequency range from information stored in the ME or UICC of the first client device 100.
  • the configuration may also be received oversidelink communication from a second client device 300.
  • the first client device 100 may obtain the configuration indicating a cell search frequency range based on a pre-defined rule, a pre-configuration in a ME or a UICC, signaling of a network access node 350, and/or signaling of the one or more second client devices 300a, 300b..., 300n.
  • the configuration to be used is the configuration with the highest priority.
  • the priority can e.g. be given by a predefined rule such as a standard.
  • the configuration to be used is a sum of the multiple configurations, e.g. the multiple configurations obtained from different sources mentioned above.
  • the configuration comprises multiple cell search frequency ranges, and where each cell search frequency range is associated with one or more frequency ranges used for the sidelink communication.
  • the cell search frequency range is associated with the frequency range for sidelink communication.
  • the association between the cell search frequency range and the frequency range used for sidelink communication can be explicitly given by the structure of the configuration.
  • the structure of the configuration can be in tabular form such that some data are stored in a row oriented manner and some data is stored in a column oriented manner.
  • input data for the cell search frequency range, sidelink frequency range and area can be added in a column oriented manner and the association between the respective input data can be given by the respective column.
  • the cell search frequency range may cover the first set of radio resources, i.e. the cell search frequency range may overlap with frequencies used by a gNB transmitting a SSB.
  • the cell search frequency may at least partially overlap with a frequency range for the sidelink communication.
  • the sidelink communication may interfere with gNB transmission. This could be a typical case if gNB communication is performed using time division duplex (TDD), i.e. Uu interface uplink (UL) and downlink (DL) communication is take place in same radio frequency spectrum.
  • TDD time division duplex
  • FDD frequency division duplex
  • Uu interface UL and DL communication take place in different radio frequency spectrum
  • the association between the UL and DL Uu interface is determined by the duplex distance
  • sidelink communication may be performed in uplink (UL) specific frequency resources and SSB is transmitted in DL specific frequency resources.
  • the cell search frequency range may at least partially overlap the corresponding DL frequency resources associated to the frequency range used for sidelink communication in UL frequency resources.
  • the cell search frequency range may be smaller than a 3GPP frequency band, for instance smaller or equal to frequency range of a PLMN allocation in a frequency band handled by an operator.
  • the first client device 100 may determine the set of frequency ranges from the frequency range, by further utilize knowledge of the design of frequency bands in the NR standard.
  • the first client device 100 obtains from the first radio resources the configuration indicating a cell search frequency range by determining a maximum frequency range around the first radio resources where NR cells can transmit.
  • the maximum fast Fourier transform (FFT) size in NR is 4096, and assuming, the maximum possible 240 kHz subcarrier spacing in NR, a maximum frequency range is approximately [f0-400 MHz, f0+400 MHz] where fO is the center frequency of the first radio resources.
  • FFT fast Fourier transform
  • This large frequency range may span over one or several NR frequency bands, and hence the first client device 100 then may need to perform cell search only in these by NR standard defined frequency band(s).
  • the configuration indicating a cell search frequency range may be associated with a performance requirement for the cell search, such as a time constraint.
  • the time constraint may specify the longest allowed time for finding a network access node after entering within coverage.
  • the time constraint may also specify a cell search periodicity, which defines a periodicity of how often the cell search procedure shall be repeated in the cell search frequency range.
  • a cell or physical cell identity assumed to have first received a signal strength for its SSB such as a reference signal received power (RSRP), signal-to-interference-plus-noise ratio (SINR), or reference signal received quality (RSRQ)
  • RSRP reference signal received power
  • SINR signal-to-interference-plus-noise ratio
  • RSRQ reference signal received quality
  • Verified herein may mean that a RSRP, RSRQ or a similar measurement can be done with sufficient accuracy and reliability.
  • the time constraint may, according to embodiments, be dependent on a pre-configured time constraint and the cell search frequency range.
  • the time constraint may e.g. be defined by a standard and be a function of a maximum of a pre-configured time and a time determined at least based on the cell search frequency range.
  • the dependency of the time constraint on the cell search frequency range may relate to size of the cell search frequency range and/or the location of the cell search frequency range in the spectrum. For example, a wider frequency range can mean a more relaxed time constraint. In another example, for higher carrier frequencies, e.g. above 6 GHz, a more relaxed time constraint can be set. In embodiments the configuration may further indicate the time constraint and/or the pre-defined time constraint.
  • the interference level and time for interference when a client device in sidelink communication comes into coverage again can vary for different client devices which may lead to degraded system capacity and performance in the communication system.
  • the cell search configuration and hence the configured cell search frequency range may be valid for an area, the area being e.g. a spatial area or a geographical area. Moreover, the configuration may further indicate the valid area.
  • the first client device 100 can obtain information that the first client device 100 is out-of coverage for the sidelink communication.
  • the first client device 100 can obtain the information that the first client device 100 is out-of coverage from a radio link monitoring procedure. For example, when a radio link failure event is detected by the first client device 100.
  • the first client device 100 can obtain the information that the first client device 100 is out-of coverage based on a higher layer state.
  • the higher layer state may mean a cell selection or reselection procedure where no cells can be found.
  • the higher layer state can mean that a PLMN selection procedure can determine that no PLMN can be found or registered upon and hence that the first client device 100 is out-of coverage.
  • the higher layer state could be in a detached state.
  • the first client device 100 can obtain the information that the first client device 100 is out-of coverage based on control signaling from one or more second client devices 300a, 300b, ... , 300n over the sidelink communication.
  • Such information about being out-of coverage may e.g. be comprised in SCI(s) or RRC message(s) from the one or more second client devices 300a, 300b, ... , 300n.
  • the out-of coverage for the sidelink communication could be determined when all members in a sidelink communication group are out-of coverage w.r.t to a network access node, e.g. over the Uu interface.
  • out-of coverage for the sidelink communication could be determined by the first client device 100 itself and/or determined by an indication from the one or more second client devices 300a, 300b, ... , 300n, e.g. in control signaling.
  • the control signaling received from the one or more second client devices 300a, 300b, ... , 300n only indicates out-of coverage
  • the first client device 100 uses the frequency range on which the first client device 100 receives the control signaling, . e.g. using the frequency range used for receiving control signaling from the one or more second client devices 300a, 300b, ... , 300n.
  • the control signaling received from the one or more second client devices 300a, 300b, ... , 300n indicates information to be used for sidelink communication, e.g. carrier frequency, bandwidth, maximum transmission power, modulation and coding scheme (MCS), etc.
  • the first client device 100 uses said information indicated in the control signaling to perform an initial transmission in the sidelink communication.
  • the initial transmission may be data transmission or transmission of a preamble in a random access procedure.
  • determining that the first client device 100 is out-of coverage for the sidelink communication can be based on one or more combinations previously described, e.g.: a radio link failure procedure, a higher layer state, and control signaling from one or more second client devices 300a, 300b, .., 300n.
  • the first client device 100 may inform the one or more second client devices 300a, 300b, ... , 300n about out-of coverage over Uu interface state w.r.t the first client device 100. This may be done via control signaling over the sidelink communication, e.g. as comprised in SCI(s) or RRC message(s).
  • the first client device 100 is configured to signal to the one or more second client devices 300a, 300b, ... , 300n that the first client device 100 is out of coverage over the Uu interface.
  • This behavior can be seen as a part in, a group out-of coverage determination and hence can be seen as another embodiment in relation to described above with reference to step 606 above.
  • the cell search procedure will be triggered first when a whole group of client devices are in an out-of coverage state.
  • step 610 in Fig. 5 the first client device 100 starts to perform cell search according to the configuration indicating the cell search frequency range.
  • the configuration indicating the cell search frequency range may be associated with a performance requirement for the cell search, such as a time constraint. Therefore, according to embodiments performing the cell search procedure according to the configuration in the cell search frequency range may comprise performing the cell search procedure in the cell search frequency range according to a time constraint.
  • embodiments of the disclosure also cover the scope that the first client device 100 both performs LTE cell search and NR cell search in the obtained cell search frequency range, or in different subset of the cell search frequency ranges, i.e. in a first subset of frequency ranges NR cell search is performed, and in a second subset of frequency ranges, LTE cell search is performed since the cell search in LTE and NR are different in respect of PSS, SSS, frequency band, sample rate, etc.
  • Fig. 6 shows an exemplary implementation according to an embodiment of the disclosure.
  • the first client device 100 and one or more second client devices 300 are depicted as members of a platoon of vehicles in a NR network.
  • Fig. 6 shows the platoon during three different time instances, i.e. t1 to t3, while moving along a path and corresponding frequency ranges, depicted as bars A, B and C.
  • the first client device 100 is inside the coverage of a first gNB, i.e. gNB1 , and in connection with the first gNB via the Uu interface.
  • the first client device 100 performs sidelink communication with one or more second client devices 300 on resources SLi configured by the first gNB.
  • Bar A depicts the system bandwidth of first gNB on a frequency axis f.
  • the first client device 100 is also configured with a first radio resource set Sl_2 for sidelink communication in case sidelink communication takes place out-of cellular network coverage.
  • the first client device 100 is furthermore configured with an active bandwidth part (BWP) by first gNB, the BWP covering the configured sidelink resources S .
  • BWP is a new concept in NR compared to earlier radio access technologies, such as LTE, in which a UE is configured with one or more BWPs, i. e. frequency ranges, where in up to Release 16 only one BWP is active for a UE at one time instance.
  • the UE needs to monitor a control channel within the active BWP.
  • the UE receiver bandwidth is decoupled from the network access node system bandwidth.
  • the first client device 100 obtains a configuration indicating a cell search frequency range associated with the frequency range for sidelink communication, depicted by bar B, in which the first client device 100 should perform cell search with certain cell detection requirement, when performing sidelink communication out-of coverage of first gNB.
  • the cell search frequency range is smaller than a 3GPP frequency band, e.g. covering frequencies within a frequency band operated by a certain operator.
  • the cell search frequency range may be configured by a first gNB.
  • the platoon moves out-of coverage.
  • the sidelink communication is made on the pre-configured resources Sl_2.
  • the first client device 100 performs cell search on the pre-configured cell search frequency range B according to the cell detection requirements to detect any neighbor cells.
  • the first client device 100 in the platoon comes into coverage of a second gNB, i.e. gNB2, with a system bandwidth, depicted as bar C.
  • the first client device 100 performing the cell search on the pre-configured cell search frequency range B will now be able to detect the SSB transmitted by the second gNB, attach to the second gNB and receive new sidelink communication resources.
  • the cell search is triggered upon determining that the first client device 100 is out-of coverage.
  • the cell search could also be triggered in case the first client device 100 is in coverage and Uu communication takes place on a first frequency i.e. the current serving cell, while the sidelink communication takes place on a second frequency, and where the second frequency is an operator managed (licensed) spectrum.
  • the second frequency may not be operated by the first client device’s 100 current serving cell.
  • the trigger in the first client device 100 is that the radio resources for the sidelink communication is on a second frequency, while the Uu communication is on a first frequency and the serving cell does not manage the sidelink communication resources, i.e. the second frequency.
  • the sidelink communication is out-of-coverage with respect to the control of a current serving cell.
  • the first client device 100 obtains information about a cell search frequency range to perform cell search on as well as obtaining cell search requirements in similar way and examples as described in the present disclosure.
  • the first client device 100 performs cell search according to a configured requirement on a configured frequency range associated to the second frequency.
  • any method according to embodiments of the disclosure may be implemented in a computer program, having code means, which when run by processing means causes the processing means to execute the steps of the method.
  • the computer program is included in a computer readable medium of a computer program product.
  • the computer readable medium may comprise essentially any memory, such as a ROM (Read-Only Memory), a PROM (Programmable Read-Only Memory), an EPROM (Erasable PROM), a Flash memory, an EEPROM (Electrically Erasable PROM), or a hard disk drive.
  • embodiments of the first client device 100 comprises the necessary communication capabilities in the form of e.g., functions, means, units, elements, etc., for performing the solution.
  • means, units, elements and functions are: processors, memory, buffers, control logic, encoders, decoders, rate matchers, de-rate matchers, mapping units, multipliers, decision units, selecting units, switches, interleavers, de-interleavers, modulators, demodulators, inputs, outputs, antennas, amplifiers, receiver units, transmitter units, DSPs, MSDs, TCM encoder, TCM decoder, power supply units, power feeders, communication interfaces, communication protocols, etc. which are suitably arranged together for performing the solution.
  • the processor(s) of the first client device 100 may comprise, e.g., one or more instances of a Central Processing Unit (CPU), a processing unit, a processing circuit, a processor, an Application Specific Integrated Circuit (ASIC), a microprocessor, or other processing logic that may interpret and execute instructions.
  • the expression “processor” may thus represent a processing circuitry comprising a plurality of processing circuits, such as, e.g., any, some or all of the ones mentioned above.
  • the processing circuitry may further perform data processing functions for inputting, outputting, and processing of data comprising data buffering and device control functions, such as call processing control, user interface control, or the like.

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

Abstract

L'invention concerne un dispositif client (100) pour effectuer une procédure de recherche de cellule lorsqu'il est hors couverture. Le premier dispositif client (100) est configuré avec une plage de fréquences pour une communication de liaison latérale avec un ou plusieurs dispositifs clients (300a, 300b, …, 300n). Le premier dispositif client (100) obtient une configuration indiquant une plage de fréquences de recherche de cellule et effectue une procédure de recherche de cellule en fonction de la configuration dans la plage de fréquences de recherche de cellule indiquée lors de la détermination que le premier dispositif client (100) est hors de couverture. La plage de fréquences de recherche de cellule est associée à la plage de fréquences pour une communication de liaison latérale. Ainsi, le premier dispositif client peut effectuer une recherche de cellule dans une plage de fréquence commandée et, par conséquent, l'interférence provenant d'une communication de liaison latérale peut être commandée dans le système. En outre, la présente demande concerne également des procédés correspondants et un programme informatique.
PCT/EP2020/051006 2020-01-16 2020-01-16 Dispositif client pour effectuer une recherche de cellule hors couverture lorsqu'il est configuré pour une liaison latérale Ceased WO2021144026A1 (fr)

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Cited By (1)

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WO2022194376A1 (fr) * 2021-03-18 2022-09-22 Huawei Technologies Co., Ltd. Procédure de découverte pour positionnement de liaison latérale

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WO2022194376A1 (fr) * 2021-03-18 2022-09-22 Huawei Technologies Co., Ltd. Procédure de découverte pour positionnement de liaison latérale

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