WO2014158064A1 - Procédé et dispositif de sélection d'une référence de synchronisation - Google Patents

Procédé et dispositif de sélection d'une référence de synchronisation Download PDF

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Publication number
WO2014158064A1
WO2014158064A1 PCT/SE2013/050346 SE2013050346W WO2014158064A1 WO 2014158064 A1 WO2014158064 A1 WO 2014158064A1 SE 2013050346 W SE2013050346 W SE 2013050346W WO 2014158064 A1 WO2014158064 A1 WO 2014158064A1
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WO
WIPO (PCT)
Prior art keywords
synchronization
beacon
priority
status information
sending
Prior art date
Application number
PCT/SE2013/050346
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English (en)
Inventor
Stefano Sorrentino
Original Assignee
Telefonaktiebolaget L M Ericsson (Publ)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget L M Ericsson (Publ) filed Critical Telefonaktiebolaget L M Ericsson (Publ)
Priority to PCT/SE2013/050346 priority Critical patent/WO2014158064A1/fr
Publication of WO2014158064A1 publication Critical patent/WO2014158064A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H04W56/002—Mutual synchronization

Definitions

  • the present embodiments relate to synchronization in a communication system.
  • it relates to a method and a device for selecting a synchronization reference in a communication system.
  • D2D communication has been promoted as a means to provide peer-to-peer services between user equipments (UEs).
  • UEs user equipments
  • An advantage with using D2D communication is that the capacity of a radio communication network is enhanced since traffic between UEs need not necessarily pass through the radio communication network nodes. As a result, the radio communication network ma be offloaded in terms of traffic between UEs.
  • D2D communication enables infrastructure-less communication between UEs. This may be of importance in, for example, emergency, national security and public safety situations, since during these situations bad on the radio communication neiwark(s) Is generally high.
  • D2D communication may improve coverage b allowing a UE to connect to the radio communication network via another UE, in addition, iocal communication between UEs using D2D communication is achievable without a need for radio coverage by the radio communication system.
  • LTE networks require UEs to be able to operate even in case of lack of network coverage, where partial network coverage is a special case.
  • the goal is to provide iocai discovery and connectivity to UEs m proximity.
  • Proximity Service ProSe
  • 3GPP TR 22.803 3rd Generation Partnership Project
  • LTE cellular communications operate in a synchronized fashion with the exception of some random access procedures and cell search procedures, in other words, a UE is expected to acquire local synchronization to a serving cell or bas station by tracking reference signals suitable for such purpose e.g. primary synchronization signal (PSS), secondary synchronization signal (SSS) and common reference signal (CRS).
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • CRS common reference signal
  • An object according to embodiments herein is to provide a distributed procedure for enabling devices to autonomously selecting the most suitable synchronization reference or source in order to seamlessly support direct discovery and/or communication between device and cellular operations when network coverage is available.
  • a method for use in a device for selecting a synchronization reference.
  • the method comprises: receiving a synchronization status information from each synchronization reference, in proximity of the device, sending a beacon or a reference signal; determining, for each received synchronization status information, a synchronization priority based on at least the received synchronization status information; assigning an own synchronization priority for the device, the device being itself a synchronization reference; comparing the synchronization priorities; and selecting a synchronization reference having the highest synchronization priority.
  • a device for selecting a synchronization reference comprising: a receiver unit configured to receive a synchronization status information from each synchronization reference, in proximity of the device, sending a beacon or a reference signal.
  • the device further comprises a processing unit configured to determine, for each received synchronization status information, a synchronization priority based on the received synchronization status information ,
  • the processing unit is further configured to assign an own synchronizaison priority of the device, the device being itself a synchronization reference.
  • the processing unit is further configured to compare the synchronization priorities; and is further configured to select a synchronization reference having the highest synchronization priority.
  • An advantage with the present embodiments is to find the most suitable synchronization source/reference to synchronize thereby providing a flexible synchronization.
  • Another advantage is that the signalling is minimum and the synchronization reference can be selected without need for bidirectional signalling.
  • Figure 2 is a diagram illustrating another scenario involving a plurality of synchronization references.
  • Figure 3 is a flowchart illustrating mai method steps performed by a device according to the present embodiments.
  • FIG. 4 is a block diagram illustrating an exemplary device according to the present embodiments. DETAILED DESCRIPTION
  • the exemplary embodiments described herein are not restricted to any particular radio access technology.
  • the embodiments herein are applicable in systems such as GSM, WCD A, LTE, CDMA200, WlfVlAX, GPS, etc.
  • a synchronization reference may be a user equipment (UE) 11 , 12, 13, or a network node 14 e.g. a eNodeB or a radio base station, or a GPS 15 or any suitable device capable in advertising itsei as a local potential synchronization source for other devices or nodes.
  • UE user equipment
  • network node 14 e.g. a eNodeB or a radio base station
  • GPS 15 any suitable device capable in advertising itsei as a local potential synchronization source for other devices or nodes.
  • Even the device that is to perform the method according to present embodiments is a synchronization reference as will be explained in more detailed.
  • each synchronization reference has a synchronization status (Sync. Status) and is capable to signal or send a synchronizatio status information (Sync. Status Info.) in a beacon or in a reference signal as shown In the figure.
  • a synchronization status e.g.
  • a synchronizatio status information e.g.
  • Such signaling may be broadcasted or sent in a device-specific fashion e.g. over a control or reference signal.
  • beacon refers to any suitable control channel for direct device-to-device control signalling.
  • synchronization references 11 , 12, 14 and 15 are shown transmitting a synchronization status information. Also reference 13 may transmit a synchronization status information although not explicitly shown in the figure.
  • synchronization is in this context referred to time and/or carrier frequency synchronization or to any combination of time domain and frequency domain synchronization, with various level of accuracy.
  • a device or a synchronization reference may have a synchronization status.
  • a synchronization reference may be synchronized directly to an infrastructure network or over the air the interface.
  • a synchronization reference may be synchronized to a source externa! to the 5 infrastructure network e.g. to a GPS.
  • a synchronization reference may be synchronized to a device which is indirectly synchronized to the infrastructure network or a synchronization reference is not necessary synchronized to an external synchronization source.
  • the synchronization status information that is advertised b a synchronization 10 reference may include information about the synchronization reference's synchronization reference origin i.e. the synchronization reference identify or identification number of the device or synchronization reference providing synchronization to a chain of references. Such information may include the synchronization origin node/device ' s identity and/or its synchronization status.
  • FIG. 15 This is iiliisirated in figure 2 depicting an example scenario comprising three synchronization references 21 , 22, 23, here exemplifying 3 UEs, although not necessarily.
  • synchronization reference A 21 has a status that it has no external synchronization reference.
  • Synchronization reference B 22 has status that it is synchronized to reference A 21.
  • each of these references sends a synchronization status information including identity of the node/device/reference it is synchronized to.
  • the synchronization status information may include information about the number of devices that the reference is providing synchronization to.
  • FIG. 25 there is illustrated a flowchart 30 of a method for enabling a device to select a synchronization reference in according with the present embodiments.
  • the device may itself be a synchronization reference having an own synchronization status.
  • the method performed by the device, comprises: the device 30 receiving 31 a synchronization status information from each (candidate) synchronization reference sending a beacon or a reference signal and being in proximity of the device.
  • the device itself may also signal its own synchronization status information to the synchronization references.
  • the method further comprises, the device determining 32, for each received synchronization status information, a synchronization priority based on at least the status information.
  • the device also assigns 33 an own synchronization priority.
  • the method further comprises, the device comparing 34 the synchronization priorities associated to the synchronization status of each synchronization reference and then selecting 35 a synchronization reference having the highest synchronization priority, t should be mentioned that a synchronization reference may be a device or a node.
  • the device in the event the own synchronization priority is the highest among the determined priorities; the device selects or maintains its own synchronization reference. Otherwise the device selects a synchronization reference having the highest priority among the determined synchronization priorities. Hence, in case the device assigns a low own synchronization priority, the device compares the determined synchronization priorities and instead selects as synchronization reference, the one having the highest synchronization among the determined priorities. According to an embodiment, for each synchronization reference sending a beacon or a reference signal, the device determines a synchronization priority further based on an estimated path gain or path loss between the device and the synchronization reference.
  • the device determines a synchronization priority further based on an estimated received signal strength of a signal received at the device from the synchronization reference.
  • the device By taking into consideratio the path gain (or path loss ⁇ and/or the signal strength, the device is able to prioritize a reliable (strong signal) synchronization reference over an unreliable (weak signal) one, even though the unreliable reference might potentially have synchronization towards an infrastructure network.
  • the device assigns a highe priority to this reference than if the synchronization reference is synchronized over the air or indirectl through another wireless node to the infrastructure network. Similarly, the device assigns a low synchronization priority to a reference that is isolated and that does not have any external synchronization reference.
  • the device may further consider the identities associated to each synchronization reference, and the information about the original synchronization reference. For example, if a reference A provides synchronization to two references B and C then the device assigns a higher priority to reference A than to reference B and C,
  • the determination of the synchronization priority for each synchronization reference is determined at least based on the synchronization status information received by the device. So in the above case, reference A provides to the device (via a beacon or a reference signal) the synchronization status information informing the device that reference A is providing synchronization to reference B and C.
  • the synchronization status information may further comprise information about number of devices that the synchronization reference is providing synchronization to.
  • the status information send by synchronization reference A may comprise 2 i.e. that A is already providing synchronization to B and C.
  • the identities of B and C may also be indicated n the information.
  • a synchronization reference associated to a node performing or scheduled to perform broadcast data transmission may be assigned higher synchronization priority than other synchronization references not associated to broadcast data transmission attempts.
  • the synchronization status information is encoded in the beacon or in the reference signai which may be a controi channel occasionally transmitted by the synchronization references that advertise their present to device(s) in proximity.
  • the synchronization status information may be encoded or embedded in one or more reference signals e.g. direct access synchronization signals transmitted by some references with the aim of acting as locai synchronization reference.
  • the payioad of the synchronization status s information may be encoded based on a predefined mapping from the reference signal sequence properties (e.g., the index of the sequence out of a number of predefined sequences) and/or reference signal resource and spectrum mapping to payfoad content.
  • the device may derive the synchronization status information from the reference signal sequence and mapping.
  • the exemplary0 embodiments are not restricted to any particular mapping or sequence.
  • the synchronization status information may comprise synchronization signals e.g. PSS primary synchronization signal (PSS) and secondary synchronization signal (SSS)
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • the synchronization reference is a LIE network node i.e. a e odeB
  • Sn that case the device receiving the SSSs and PSS determine and assigns the highest possible priority to such LTE network node and when comparing with the priorities of other references, selects the LTE network node to synchronize to. in other words, if the device detects SSS/PSS it synchroniEes to the LTE network node, even though other infrastructure synchronization references may be detected in proximity.
  • the synchronization procedure or method described above may be performed periodically or may be triggered b some events, such as a random access procedure, a scheduling command, a paging message, a broadcast transmission grant, the presence of data to be delivered to another device in proximity or the detection of a LTE network (PSS/SSS) by a device synchronized to another5 device.
  • some events such as a random access procedure, a scheduling command, a paging message, a broadcast transmission grant, the presence of data to be delivered to another device in proximity or the detection of a LTE network (PSS/SSS) by a device synchronized to another5 device.
  • PSS/SSS LTE network
  • a UE or a node may be provided synchronization event if it is our of network coverage
  • the device performing the comparison of the priority of the different synchronization sources/references may select not to be a synchronization source/reference. This may be achieved, e.g., by assigning the synchronization priority of the device i.e. the own priority to a minimum or low level, or by not considering unsuitable devices in the list of candidate synchronization references.
  • the device may compare determined priorities and select a highest priority among the determined priorities without involved the own assigned low priority.
  • the device 400 may be a network node or a UE.
  • the device 400 comprises a receiver unit circuit 410 configured to receive a synchronization status information from each synchronization reference, in proximity of the device 400, sending a beacon or a reference signal.
  • the device 400 further comprises a transmitter unit 420 by means of which the device 400 can send or transmit signals or data to other devices or nodes.
  • the device 400 may also advertise itself as a synchronization source of referenc to other devices or references.
  • Both the receiver unit 410 and the transmitter unit 420 may be parts of a transceiver unit 460 and in that case the receiver and transmitter units need not be separate components.
  • the receiver and transmitter units are connected to an antenna arrangement which may comprise one or more antennas 450.
  • the device 400 further comprises a processing unit/circuit 430 configured to determine, for each received synchronization status information, a synchronization priority based on the received synchronization status information.
  • the processing unit 430 is further configured to assign an own synchronization priority for the device 400.
  • the device 400 itself is a synchronization reference.
  • the processing unit circuit 430 is further configured to compare the synchronization priorities and is further configured to select a synchronization reference having the highest synchronization priority.
  • the device 400 is also shown comprising a memory 440 which may include a random access memory (RAM), a read-onl memory (ROM) and/or another type of memory to store data and instructions that may be used or processed b the processing unit 430.
  • RAM random access memory
  • ROM read-onl memory
  • the processin unit 430 is configured to select or maintain own synchronization reference if the own synchronization priority is the highest among all determined synchronization priorities. Otherwise, the processing unit 420 is configured to select a synchronization reference having the highest synchronization priority among the determined priorities.
  • the processing unit 430 is configured to determine, for each synchronization reference sending the beacon or the reference signal, a synchronization priority further based on an estimated path gain (or path loss) between the device 400 and the synchronization reference sending the beacon or the reference signal. According to an embodiment, the processing unit 430 is configured to determine, for each synchronization reference sending the beacon or the reference signal, a synchronization priority further based on an estimated received signal strength of a signal received (by means of the receiver circuit 41 ) at the device 400 from the synchronization reference sending the beacon or the reference signal. As previously described, the synchronization status information may comprise information about the number of devices that the synchronization reference sending the beacon or the reference signal is providing synchronization to.
  • the synchronization status information may be encoded in the beacon or in the reference signal transmitted from the reference source. Additional details regarding on the functions of the device have already been described and do not need to be repeated again.
  • the processing unit 430 includes a processor, an application specific integrated circuit (ASIC), field programmable gate array (FPGA) or the like. The processing unit 430 controls the operation of the device 400 and its components.
  • the processing unit 430 and the memory 440 may be part of a processing system 470 as shown, in addition, the device 400 is also shown comprising an interface 480 which may be different depending on whether the device is a UE or a network node.
  • the device 400 may contain, different, or .additional components than depicted, depending on the type of device (UE or network node).
  • UE includes, but should not be limited to, a mobile station, a fixed or mobile subscriber unit, a pager, a cellular telephone, a personal digital assistant (PDA), a computer, or any other type of user device capable of operating in a wireless communication.
  • PDA personal digital assistant
  • network node includes a radio base station, a eNB, a eNodeB, an access point or any suitable network node.
  • an embodiment includes a computer-readable medium having instructions stored thereon that are executable by a computer system located in one or several devices being UE ⁇ s) or network node(s) of the communication system, for selecting a synchronization reference or synchronization source.
  • the instructions executable by the computing system and stored on the compuier- readable medium perform the method steps of the present embodimenis as set forth in the claims.

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

Abstract

Les modes de réalisation illustratifs concernent un procédé utilisable dans un dispositif (400), et un dispositif de sélection d'une référence de synchronisation. Selon les modes de réalisation de la présente invention, le dispositif est configuré pour recevoir des informations de statut de synchronisation de chaque référence de synchronisation. Le dispositif (400) est en outre configuré pour déterminer une priorité sur la base de chaque information de statut reçue et pour attribuer une priorité de synchronisation propre. Après quoi, le dispositif (400) est configuré pour comparer les priorités et, sur la base de cette comparaison, sélectionne une référence de synchronisation à partir du résultat de la comparaison.
PCT/SE2013/050346 2013-03-27 2013-03-27 Procédé et dispositif de sélection d'une référence de synchronisation WO2014158064A1 (fr)

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Cited By (11)

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WO2015065283A1 (fr) * 2013-11-01 2015-05-07 Telefonaktiebolaget L M Ericsson (Publ) Noeud radio et procédé pour fournir sélectivement des informations de synchronisation pour une communication dispositif à dispositif (d2d)
WO2016064450A1 (fr) * 2014-10-23 2016-04-28 Fujitsu Limited Séquences de synchronisation de dispositif à dispositif
EP3031221A1 (fr) * 2013-08-11 2016-06-15 Telefonaktiebolaget LM Ericsson (publ) Procédé et dispositif de sélection d'une référence de synchronisation
EP3031291A1 (fr) * 2013-08-11 2016-06-15 Telefonaktiebolaget LM Ericsson (publ) Procédé et dispositif pour envoyer un signal de synchronisation
WO2017003645A1 (fr) * 2015-07-02 2017-01-05 Qualcomm Incorporated Synchronisation pour systèmes de communication sans fil
WO2018028983A1 (fr) * 2016-08-12 2018-02-15 Telefonaktiebolaget Lm Ericsson (Publ) Technique pour effectuer une opération dispositif-à-dispositif
KR20180049030A (ko) * 2015-09-24 2018-05-10 후아웨이 테크놀러지 컴퍼니 리미티드 동기화 방법, 사용자 기기 및 기지국
US10117282B2 (en) 2013-11-11 2018-10-30 Telefonaktiebolaget Lm Ericsson (Publ) D2D device communication using a broadcast type message
WO2020027572A1 (fr) * 2018-07-31 2020-02-06 엘지전자 주식회사 Procédé et dispositif de transmission d'un signal de synchronisation au moyen d'un terminal de liaison latérale dans un système de communication sans fil
WO2021083496A1 (fr) * 2019-10-29 2021-05-06 Telefonaktiebolaget Lm Ericsson (Publ) Commande basée sur une cible de signaux de synchronisation dans une communication d2d
EP4277369A4 (fr) * 2021-02-02 2024-03-20 Huawei Technologies Co., Ltd. Procédé et appareil de communication à courte distance

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EP3031221A1 (fr) * 2013-08-11 2016-06-15 Telefonaktiebolaget LM Ericsson (publ) Procédé et dispositif de sélection d'une référence de synchronisation
EP3031291A1 (fr) * 2013-08-11 2016-06-15 Telefonaktiebolaget LM Ericsson (publ) Procédé et dispositif pour envoyer un signal de synchronisation
EP3031221A4 (fr) * 2013-08-11 2017-03-29 Telefonaktiebolaget LM Ericsson (publ) Procédé et dispositif de sélection d'une référence de synchronisation
EP3031291A4 (fr) * 2013-08-11 2017-03-29 Telefonaktiebolaget LM Ericsson (publ) Procédé et dispositif pour envoyer un signal de synchronisation
WO2015065283A1 (fr) * 2013-11-01 2015-05-07 Telefonaktiebolaget L M Ericsson (Publ) Noeud radio et procédé pour fournir sélectivement des informations de synchronisation pour une communication dispositif à dispositif (d2d)
US10542509B2 (en) 2013-11-01 2020-01-21 Telefonaktiebolaget L M Ericsson (Publ) Radio node and method for selectively providing synchronization information for a device-to-device (D2D) communication
US10117282B2 (en) 2013-11-11 2018-10-30 Telefonaktiebolaget Lm Ericsson (Publ) D2D device communication using a broadcast type message
WO2016064450A1 (fr) * 2014-10-23 2016-04-28 Fujitsu Limited Séquences de synchronisation de dispositif à dispositif
CN112218367A (zh) * 2015-07-02 2021-01-12 高通股份有限公司 用于无线通信系统的同步
US11153837B2 (en) 2015-07-02 2021-10-19 Qualcomm Incorporated Synchronization for wireless communication systems
CN112218367B (zh) * 2015-07-02 2023-08-04 高通股份有限公司 用于无线通信的方法和装置
CN107820722A (zh) * 2015-07-02 2018-03-20 高通股份有限公司 用于无线通信系统的同步
EP3522624A1 (fr) * 2015-07-02 2019-08-07 QUALCOMM Incorporated Synchronisation pour systèmes de communication sans fil
KR20190126204A (ko) * 2015-07-02 2019-11-08 퀄컴 인코포레이티드 무선 통신 시스템들에 대한 동기화
KR102397325B1 (ko) 2015-07-02 2022-05-11 퀄컴 인코포레이티드 무선 통신 시스템들에 대한 동기화
WO2017003645A1 (fr) * 2015-07-02 2017-01-05 Qualcomm Incorporated Synchronisation pour systèmes de communication sans fil
TWI693851B (zh) * 2015-07-02 2020-05-11 美商高通公司 用於無線通訊系統的同步
CN107820722B (zh) * 2015-07-02 2020-10-30 高通股份有限公司 用于无线通信系统的同步
US11611945B2 (en) 2015-09-24 2023-03-21 Huawei Technologies Co., Ltd. Synchronization method, user equipment, and base station
KR102147713B1 (ko) 2015-09-24 2020-08-25 후아웨이 테크놀러지 컴퍼니 리미티드 동기화 방법, 사용자 기기 및 기지국
CN111867043A (zh) * 2015-09-24 2020-10-30 华为技术有限公司 同步方法、用户设备和基站
KR20180049030A (ko) * 2015-09-24 2018-05-10 후아웨이 테크놀러지 컴퍼니 리미티드 동기화 방법, 사용자 기기 및 기지국
CN111867043B (zh) * 2015-09-24 2022-08-09 华为技术有限公司 同步方法、用户设备和基站
US10820288B2 (en) 2015-09-24 2020-10-27 Huawei Technologies Co., Ltd. Synchronization method, user equipment, and base station
EP3340699A4 (fr) * 2015-09-24 2018-09-05 Huawei Technologies Co., Ltd. Procédé de synchronisation, équipement d'utilisateur et station de base
US10952167B2 (en) 2016-08-12 2021-03-16 Telefonaktiebolaget Lm Ericsson (Publ) Technique for performing device-to-device operation
WO2018028983A1 (fr) * 2016-08-12 2018-02-15 Telefonaktiebolaget Lm Ericsson (Publ) Technique pour effectuer une opération dispositif-à-dispositif
WO2020027572A1 (fr) * 2018-07-31 2020-02-06 엘지전자 주식회사 Procédé et dispositif de transmission d'un signal de synchronisation au moyen d'un terminal de liaison latérale dans un système de communication sans fil
US11627620B2 (en) 2018-07-31 2023-04-11 Lg Electronics Inc. Method and device for transmitting synchronization signal by means of sidelink terminal in wireless communication system
WO2021083496A1 (fr) * 2019-10-29 2021-05-06 Telefonaktiebolaget Lm Ericsson (Publ) Commande basée sur une cible de signaux de synchronisation dans une communication d2d
EP4277369A4 (fr) * 2021-02-02 2024-03-20 Huawei Technologies Co., Ltd. Procédé et appareil de communication à courte distance

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