WO2013054796A1 - Station de base et procédé de commande de communication - Google Patents

Station de base et procédé de commande de communication Download PDF

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Publication number
WO2013054796A1
WO2013054796A1 PCT/JP2012/076157 JP2012076157W WO2013054796A1 WO 2013054796 A1 WO2013054796 A1 WO 2013054796A1 JP 2012076157 W JP2012076157 W JP 2012076157W WO 2013054796 A1 WO2013054796 A1 WO 2013054796A1
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WO
WIPO (PCT)
Prior art keywords
synchronization
syncrequest
uplink
base station
mobile station
Prior art date
Application number
PCT/JP2012/076157
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English (en)
Japanese (ja)
Inventor
徹 内野
アニール ウメシュ
Original Assignee
株式会社エヌ・ティ・ティ・ドコモ
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Filing date
Publication date
Application filed by 株式会社エヌ・ティ・ティ・ドコモ filed Critical 株式会社エヌ・ティ・ティ・ドコモ
Publication of WO2013054796A1 publication Critical patent/WO2013054796A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H04W56/0015—Synchronization between nodes one node acting as a reference for the others
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time

Definitions

  • the present invention relates to a base station and a communication control method for transmitting a SyncRequest requesting establishment of uplink synchronization to a mobile station when uplink synchronization loss is detected.
  • LTE Long Term Evolution
  • 3GPP 3rd Generation Partnership Project
  • eNB base station
  • UL uplink
  • 3GPP 3rd Generation Partnership Project
  • a SyncRequest is transmitted to a station via a downlink control physical channel (PDCCH) (see, for example, Non-Patent Document 1).
  • the mobile station that has received the SyncRequest executes a Random access (RA) procedure to reestablish uplink synchronization.
  • RA Random access
  • the conventional uplink synchronization establishment method described above has the following problems. In other words, if the mobile station fails to receive SyncRequest, the RA procedure is not executed, so uplink synchronization is not reestablished and the uplink out-of-sync state continues for a long time. .
  • uplink individual resources uplink resources for reporting feedback information such as the channel Quality Indicator (CQI) of the mobile station
  • CQI channel Quality Indicator
  • An object is to provide a station and a communication control method.
  • a first feature of the present invention is that a synchronization state detection unit (UL out-of-sync detection unit 105) that detects whether it is necessary to establish uplink synchronization with a mobile station (for example, mobile station 200A),
  • a synchronization request transmission unit (synchronization request transmission unit 107) configured to transmit a SyncRequest requesting the mobile station to establish the uplink synchronization when the synchronization state detection unit determines that the uplink synchronization establishment is necessary;
  • the synchronization request transmission unit transmits a new SyncRequest to the mobile station when the synchronization state detection unit continues to establish the uplink synchronization even after transmitting the SyncRequest.
  • the gist is that it is a base station (base station 100).
  • the second feature of the present invention is that the communication device detects whether it is necessary to establish uplink synchronization established with the mobile station, and that the communication device requires establishment of the uplink synchronization. Detecting a synchronization request for establishing uplink synchronization to the mobile station, and in the step of transmitting the SyncRequest, the synchronization establishment of the uplink is performed even after transmitting the SyncRequest. This is a communication control method for transmitting a new SyncRequest to the mobile station when the necessary state continues. *
  • FIG. 1 is an overall schematic configuration diagram of a radio communication system according to an embodiment of the present invention.
  • FIG. 2 is a functional block configuration diagram of the base station 100 according to the embodiment of the present invention.
  • FIG. 3 is a diagram showing a communication sequence between the base station 100 and the mobile station 200A from detection of uplink synchronization loss to establishment of uplink synchronization according to the embodiment of the present invention.
  • FIG. 4 is a view showing a SyncRequest transmission operation flow in the base station 100 (PF) according to the embodiment of the present invention.
  • FIG. 5 is a diagram showing a communication sequence between the base station 100 and the mobile station 200A up to establishment of uplink synchronization according to a modification of the present invention.
  • FIG. 1 is an overall schematic configuration diagram of a radio communication system according to the present embodiment.
  • the radio communication system according to the present embodiment employs a Long Term Evolution (LTE) scheme, and includes a core network 50, a base station 100 (eNB), and mobile stations 200A and 200B (UE). Including.
  • LTE Long Term Evolution
  • eNB base station 100
  • UE mobile stations 200A and 200B
  • the base station 100 is connected to the core network 50.
  • Base station 100 forms cell C1 and performs radio communication with mobile stations 200A and 200B according to the LTE scheme.
  • the base station 100 transmits a SyncRequest requesting establishment of uplink synchronization to the mobile station 200A (or mobile station 200B, hereinafter the same).
  • the mobile station 200A executes a Random access (RA) procedure to reestablish uplink synchronization.
  • RA Random access
  • FIG. 2 is a functional block configuration diagram of the base station 100.
  • the base station 100 includes a wireless communication unit 101, a data transmission / reception unit 103, a UL synchronization loss detection unit 105, and a synchronization request transmission unit 107. Note that the base station 100 realizes these functional blocks by the platform unit (PF) and the application unit (AP).
  • PF platform unit
  • AP application unit
  • the wireless communication unit 101 performs wireless communication with the mobile station 200A (200B) according to the LTE system.
  • the data transmission / reception unit 103 transmits / receives control data (C-plane data) and user data (U-Plane data) for the mobile station 200A via the wireless communication unit 101.
  • the data transmitter / receiver 103 transmits SyncRequest, which is a type of control data transmitted from the synchronization request transmitter 107, to the mobile station 200A via the downlink control physical channel (PDCCH).
  • SyncRequest which is a type of control data transmitted from the synchronization request transmitter 107, to the mobile station 200A via the downlink control physical channel (PDCCH).
  • the UL out-of-synchronization detection unit 105 detects whether it is necessary to establish uplink (UL) synchronization with the mobile station 200A. Specifically, UL out-of-synchronization detection unit 105 detects an uplink out-of-synchronization set with mobile station 200A. In the present embodiment, the UL synchronization loss detection unit 105 constitutes a synchronization state detection unit.
  • the UL out-of-synchronization detection unit 105 monitors the quality of the uplink physical channel (Sounding RS or PUCCH) transmitted from the mobile station 200A.
  • the UL out-of-synchronization detection unit 105 detects out-of-synchronization when the quality of the uplink physical channel transmitted from the mobile station 200A falls below the threshold for a predetermined time (or a predetermined number of observations).
  • the synchronization request transmission unit 107 When the UL synchronization loss detection unit 105 determines that uplink synchronization needs to be established, specifically, when synchronization loss is detected, the synchronization request transmission unit 107 establishes uplink synchronization with the mobile station 200A. Send a SyncRequest requesting. Specifically, as described above, the synchronization request transmission unit 107 transmits SyncRequest to the mobile station 200A via the PDCCH.
  • the synchronization request transmission unit 107 uses the UL out-of-sync detection unit 105 even after transmitting a SyncRequest once in association with the detection of uplink out-of-synchronization detected by the UL out-of-synchronization detection unit 105.
  • a new SyncRequest is transmitted to the mobile station 200A.
  • the synchronization request transmission unit 107 generates a new SyncRequest when the uplink synchronization loss continues by the UL synchronization loss detection unit 105 even after a predetermined time has elapsed since the transmission of the already transmitted SyncRequest. Send.
  • the synchronization request transmission unit 107 can repeatedly transmit SyncRequest up to a predetermined number of times (N syncreq ) when the uplink synchronization loss continues.
  • FIG. 3 shows a communication sequence between the base station 100 and the mobile station 200A from detection of uplink loss of synchronization to establishment of uplink synchronization.
  • the base station 100 detects uplink out-of-synchronization (S10), and notifies the base station 100 (AP) that out-of-synchronization is detected (S20).
  • the base station 100 (PF) When the base station 100 (PF) detects an uplink out of synchronization, the base station 100 (PF) continuously transmits a SyncRequest to the mobile station 200A a plurality of times (S30). When the mobile station 200A receives the SyncRequest normally, the mobile station 200A executes the RA procedure and reestablishes uplink synchronization.
  • the base station 100 when the uplink synchronization is not re-established between the subframe in which the SyncRequest is transmitted and the subframe after a predetermined time specified by Timer synqrec , Resend SyncRequest to If uplink synchronization is reestablished from the subframe in which the first SyncRequest is transmitted to the subframe after the lapse of a predetermined time specified by Timer synqrec , the uplink synchronization is not performed without resending the SyncRequest. The establishment process is terminated.
  • the base station 100 can repeatedly transmit up to a predetermined number of SyncRequests (N syncreq ) when the uplink synchronization loss continues.
  • the base station 100 (PF) from the sub-frame transmitted with N Syncreq times SyncRequest until subframe after the predetermined period of time defined by Timer Synqrec, if the synchronization of the uplink is not re-established, the SyncRequest After the transmission, the base station 100 (AP) is notified that the uplink synchronization loss continues (S40).
  • FIG. 4 shows a SyncRequest transmission operation flow in the base station 100 (PF).
  • the base station 100 (PF) detects uplink out-of-synchronization (S110), and notifies the base station 100 (AP) of mail that the out-of-synchronization is detected (S120).
  • S110 and S120 correspond to S10 and S20 shown in FIG.
  • the base station 100 (PF) determines whether uplink synchronization has been established by the transmitted SyncRequest (S150).
  • the base station 100 adds the value of the parameter k (S160), and determines whether k is lower than N syncreq (S170).
  • a new SyncRequest is transmitted if the uplink is out of synchronization even after a predetermined time (Timer synqrec ) has elapsed since the transmission of the SyncRequest.
  • SyncRequest is repeatedly transmitted up to a predetermined number of times (N syncreq ). Therefore, uplink synchronization can be re-established reliably and quickly while suppressing unnecessary transmission of SyncRequest.
  • the SyncRequest when uplink synchronization loss is detected by the UL synchronization loss detection unit 105, the SyncRequest is transmitted. However, as illustrated in FIG. 5, uplink individual resources are released. When the resumption of data transmission via the downlink in the state is detected, the synchronization request transmission unit 107 may transmit SyncRequest.
  • FIG. 5 is a diagram showing a communication sequence between the base station 100 and the mobile station 200A up to establishment of uplink synchronization according to a modification of the present invention.
  • the base station 100 does not monitor the uplink synchronization state. Since CQI is not reported from the mobile station 200A, the uplink is always out of synchronization.
  • the base station 100 and the mobile station 200A need to reconfigure uplink individual resources. Since the uplink synchronization is not established, the base station 100 first transmits a SyncRequest to cause the mobile station 200A to activate the RA procedure (S220 to S230).
  • the operation of S240 is the same as the operation of S40 described above (see FIG. 3).
  • SyncRequest when uplink synchronization loss continues, SyncRequest is repeatedly transmitted up to a predetermined number of times (N syncreq ), but uplink synchronization loss occurs after the first SyncRequest. If it continues, SyncRequest may be transmitted multiple times without sequentially confirming that uplink synchronization has been established.
  • the base station 100 executes processing related to transmission of SyncRequest.
  • all or part of such processing is performed by, for example, another communication device connected to the core network 50. (For example, MME) may be executed.
  • Core network 100 Base station 101 .
  • Wireless communication unit 103 Data transmission / reception unit 105 ... UL out-of-sync detection unit 107 ... Synchronization request transmission unit 200A, 200B ... Mobile station C1 ... Cell

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Communication Control (AREA)

Abstract

L'invention porte sur une station de base et un procédé de commande de communication au moyen desquels il est possible de rétablir d'une manière plus définitive et rapide une synchronisation de liaison montante lorsqu'une nécessité d'établissement de synchronisation de liaison montante est détectée. Une station de base (100) comprend : une unité de détection de perte de synchronisation de liaison montante (UL) (105) pour détecter si un établissement de synchronisation d'une liaison montante configurée pour un terminal mobile (200A) est nécessaire ou non ; et une unité de transmission de requête de synchronisation (107) pour transmettre une requête de synchronisation servant à demander un établissement de synchronisation de liaison montante au terminal mobile quand l'unité de détection de perte de synchronisation UL (105) détermine qu'un établissement de synchronisation de liaison montante est nécessaire. Même après transmission de la requête de synchronisation, l'unité de transmission de requête de synchronisation (107) transmet une nouvelle requête de synchronisation au terminal mobile (200A) lorsqu'un état dans lequel l'unité de détection de perte de synchronisation UL (105) détermine qu'un établissement de synchronisation de liaison montante est nécessaire se prolonge.
PCT/JP2012/076157 2011-10-12 2012-10-10 Station de base et procédé de commande de communication WO2013054796A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011224581A JP5211217B2 (ja) 2011-10-12 2011-10-12 基地局及び通信制御方法
JP2011-224581 2011-10-12

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WO2013054796A1 true WO2013054796A1 (fr) 2013-04-18

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008153078A1 (fr) * 2007-06-12 2008-12-18 Sharp Kabushiki Kaisha Dispositif de station de base, dispositif de station mobile, programme, procédé de requête de synchronisation de liaison montante et procédé de transmission de signal de mesure de décalage de synchronisation

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008153078A1 (fr) * 2007-06-12 2008-12-18 Sharp Kabushiki Kaisha Dispositif de station de base, dispositif de station mobile, programme, procédé de requête de synchronisation de liaison montante et procédé de transmission de signal de mesure de décalage de synchronisation

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JP2013085158A (ja) 2013-05-09
JP5211217B2 (ja) 2013-06-12

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