WO2018043291A1 - Système de communication sans fil, procédé de communication sans fil, et terminal sans fil - Google Patents

Système de communication sans fil, procédé de communication sans fil, et terminal sans fil Download PDF

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Publication number
WO2018043291A1
WO2018043291A1 PCT/JP2017/030374 JP2017030374W WO2018043291A1 WO 2018043291 A1 WO2018043291 A1 WO 2018043291A1 JP 2017030374 W JP2017030374 W JP 2017030374W WO 2018043291 A1 WO2018043291 A1 WO 2018043291A1
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WO
WIPO (PCT)
Prior art keywords
state
rrc
wireless terminal
wireless communication
base station
Prior art date
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Ceased
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PCT/JP2017/030374
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English (en)
Japanese (ja)
Inventor
宏明 松本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kokusai Denki Electric Inc
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Hitachi Kokusai Electric Inc
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Publication date
Application filed by Hitachi Kokusai Electric Inc filed Critical Hitachi Kokusai Electric Inc
Priority to JP2018537205A priority Critical patent/JPWO2018043291A1/ja
Publication of WO2018043291A1 publication Critical patent/WO2018043291A1/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
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to a wireless communication system.
  • RRC_IDLE In an LTE (Long Term Evolution) mobile communication system, two states of RRC_IDLE and RRC_CONNECTED are defined as states of an RRC (Radio Resource Control) layer.
  • the RRC_IDLE state is a so-called standby state in which an RRC connection is not established and the mobile station intermittently monitors the paging signal.
  • the RRC_CONNECTED state is a so-called communication state, in which an RRC connection is established and data is transmitted and received intermittently.
  • CONNECTED_DRX for the purpose of reducing the power consumption of the mobile station in the RRC_CONNECTED state, there is a state called CONNECTED_DRX in which the mobile station as a wireless terminal performs an intermittent operation in a state where the RRC connection is established.
  • FIG. 1 shows a wireless communication system.
  • the mobile station 11 in the RRC_CONNECTED state transitions to the CONNECTED_DRX state when the no-communication state continues for a certain time, and intermittently monitors the PDCCH (Physical Downlink Control Channel).
  • the no-communication time until the transition to the CONNECTED_DRX state, the PDCCH intermittent reception interval in the CONNECTED_DRX state, the PDCCH reception time, etc. are specified in advance from the base station 12 side. No transmission / reception of the control signal between 11 and the base station 12 is performed.
  • FIG. 2 shows a transition diagram of the RRC state.
  • the base station 12 instructs the mobile station to release the RRC connection (231) and makes a transition to the RRC_IDLE (210) state.
  • the mobile station 11 uses the CONNECTED_DRX (230).
  • the base station 12 side may transition to the RRC_IDLE (210) state, and thus there may be a state mismatch between the mobile station 11 and the base station 12.
  • FIG. 3 shows an example sequence diagram in which a mismatch of RRC states occurs between the mobile station and the base station. If a new uplink traffic occurs after the RRC state mismatch between the mobile station 11 and the base station 12, the mobile station 11 requests a radio resource for uplink data transmission from the base station 12. However, since the base station 12 is in the RRC_IDLE state, the request of the mobile station 11 is not accepted, and as a result of the failure of the procedure, the mobile station 11 also transitions to the RRC_IDLE state, and the state mismatch is resolved. On the other hand, when new downlink traffic occurs, paging information is transmitted from the base station 12 side to the mobile station 11, but the mobile station 11 is in the RRC_CONNECTED state and does not respond to this paging signal. For this reason, the inconsistent state continues.
  • FIG. 6 shows a sequence of operations of the prior art when a mismatch of RRC states occurs between the mobile station and the base station. Therefore, when a mismatch in the RRC state occurs between the mobile station 11 and the base station 12, the state mismatch is not resolved until a new upstream traffic occurs, and the downstream traffic generated during that time is lost. End up. For example, when the mobile station 11 is a reception-only communication module, traffic in the upstream direction does not occur. Therefore, once the mobile station 11 falls into a mismatched state, communication becomes impossible after that.
  • Patent Document 1 a wireless communication terminal having a low reference signal reception power from a base station and a low throughput of a wireless section is detected, and an application type used by the corresponding wireless communication terminal is controlled.
  • An invention for releasing a connection in the case of a target is disclosed.
  • An object of the present invention is to eliminate a state mismatch even when a state mismatch occurs between a wireless terminal and a base station and no new uplink traffic occurs.
  • the wireless communication system of the present invention is an LTE wireless communication system that performs communication between a base station and a wireless terminal, and the base station transmits a paging signal including paging information to a specific wireless terminal in an RRC_IDLE state.
  • the wireless terminal receives a paging signal including paging information addressed to itself in the CONNECTED_DRX state, the wireless terminal locally releases the RRC connection from the CONNECTED_DRX state and transits to the RRC_IDLE state.
  • the wireless terminal establishes the RRC connection in response to the Paging response and transitions to the RRC_CONNECTED state.
  • the wireless terminal of the present invention is a wireless terminal that performs wireless communication in LTE, and when the wireless terminal receives a paging signal including paging information addressed to itself in the CONNECTED_DRX state, an RRC connection is established from the CONNECTED_DRX state. It is characterized by local release and transition to RRC_IDLE state.
  • the wireless terminal establishes the RRC connection in response to the Paging response and transitions to the RRC_CONNECTED state.
  • the state transition method of the wireless communication terminal of the present invention is a state transition method of a wireless terminal that performs wireless communication with a base station in LTE, and receives a paging signal in the CONNECTED_DRX state, and the received paging signal is It is determined whether or not the paging signal includes paging information addressed to it. If the received paging signal is a paging signal including paging information addressed to the own station, the RRC connection is locally released and the state transits to the RRC_IDLE state. Thereafter, RRC connection establishment processing is performed with the base station, and the state transits to the RRC_CONNECTED state.
  • the state mismatch can be resolved.
  • FIG. 5 is a flowchart for explaining an operation of a mobile station of a wireless communication system according to an embodiment of the present invention. It is a sequence diagram for demonstrating operation
  • FIG. 1 shows a wireless communication system.
  • the LTE (Long Term Evolution) wireless communication system includes a mobile station 11 that is a wireless terminal and a base station 12.
  • FIG. 4 is a sequence diagram for explaining the operation of the radio communication system according to the embodiment of the present invention.
  • the mobile station 11 when the mobile station 11 receives the paging signal (414) in the RRC_CONNECTED (405) state, if the paging signal includes paging information addressed to itself, the mobile station 11 locally releases (415) the RRC connection. Transition to the RRC_IDLE (404) state and perform a response operation to the paging signal.
  • the identification information (IMSI or S-TMSI) assigned to the own station is assigned to the ue-Identity included in the PagingRecord information element. Check if it exists. When there is no identification information indicating the own station, the paging signal is read and discarded. On the other hand, when the identification information indicating the own station exists, the RRC connection is released locally, and after transitioning to the RRC_IDLE state, the operation of establishing the RRC connection as a response to the paging signal is started.
  • paging procedure in the LTE system to be used for the following purposes 3GPP (3 rd Generation Partnership Project) is defined by Notification of system information change to the station ⁇ Notification of ETWS (Earthquake and Tsunami Warning System) and CMAS (Commercial Mobile Alert System)
  • ETWS Earthquake and Tsunami Warning System
  • CMAS Common Mobile Alert System
  • FIG. 5 is a flowchart for explaining the operation of the mobile station in the wireless communication system according to the embodiment of the present invention.
  • the mobile station 11 is in the CONNECTED_DRX state.
  • the mobile station 11 proceeds to the process of S502.
  • the mobile station 11 determines whether or not the paging signal includes a PagingRecord information element (S502). If the PagingRecord information element is included (YES), the mobile station 11 proceeds to the process of S504 and includes the PagingRecord information element. If not (NO), the process proceeds to S503.
  • the mobile station 11 returns to the process of S501 when a system information update notification or an ETWS / CMAS notification is received.
  • the mobile station 11 determines the presence or absence of ue-identity indicating its own station in the PagingRecord information element (S504). If there is no ue-identity (NO), the process returns to S501.
  • the mobile station 11 releases the RRC connection locally (transition to the RRC_IDLE state), and proceeds to the process of S506. In the process of S506, the mobile station 11 establishes an RRC connection and transitions to the RRC_CONNECTED state.
  • the wireless communication system can resolve the state mismatch even when a state mismatch occurs between the wireless terminal and the base station and no new uplink traffic occurs.

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

Abstract

La présente invention vise à éliminer une incohérence d'état qui se produit entre un terminal sans fil et une station de base sans un nouveau trafic de direction amont. Un système de communication sans fil selon la présente invention est un système de communication sans fil LTE utilisé pour exécuter une communication entre une station de base et un terminal sans fil. Le système est caractérisé en ce que : dans un état RRC_IDLE, la station de base transmet des informations de radiomessagerie comprenant des informations de radiomessagerie, à un terminal sans fil spécifique ; et, à réception du signal de radiomessagerie comprenant les informations de radiomessagerie adressées au terminal sans fil dans un état CONNECTED_DRX, le terminal sans fil libère localement la connexion RRC de l'état CONNECTED_DRX et passe à l'état RRC_IDLE.
PCT/JP2017/030374 2016-08-31 2017-08-24 Système de communication sans fil, procédé de communication sans fil, et terminal sans fil Ceased WO2018043291A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2018537205A JPWO2018043291A1 (ja) 2016-08-31 2017-08-24 無線通信システム、無線通信方法、無線端末

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016169661 2016-08-31
JP2016-169661 2016-08-31

Publications (1)

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WO2018043291A1 true WO2018043291A1 (fr) 2018-03-08

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130215834A1 (en) * 2012-02-16 2013-08-22 Apple Inc. Method for out of sync identification
US20140146759A1 (en) * 2012-11-23 2014-05-29 Samsung Electronics Co., Ltd. System, method and apparatus for addressing mismatch of radio resource control status in wireless communication system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130215834A1 (en) * 2012-02-16 2013-08-22 Apple Inc. Method for out of sync identification
US20140146759A1 (en) * 2012-11-23 2014-05-29 Samsung Electronics Co., Ltd. System, method and apparatus for addressing mismatch of radio resource control status in wireless communication system

Non-Patent Citations (6)

* Cited by examiner, † Cited by third party
Title
"Avoid eMTC/NB-IoT UEs Staying in RRC Connected State Unnecessarily", 3GPP TSG-RAN WG2#94 R2-164196, May 2016 (2016-05-01), XP051095438, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/tsg_ran/WG2_RL2/TSGR2_94/Docs/R2-164196.zip> *
"Discussion on RRC state mismatch", 3GPP TSG-RAN WG2#94 R2-163459, May 2016 (2016-05-01), XP051095788, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/tsg_ran/WG2_RL2/TSGR2_94/Docs/R2-163459.zip> *
"LTE UE RRC State Mismatch Handling", 3GPP TSG-RAN WG2#81 R2-130144, February 2013 (2013-02-01), XP050668028, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/tsg_ran/WG2_RL2/TSGR2_81/Docs/R2-130144.zip> *
"RRC State Mismatch Problems", 3GPP TSG-RAN WG2#82 R2-132063, May 2013 (2013-05-01), XP050700147, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/tsg_ran/WG2_RL2/TSGR2_82/Docs/R2-132063.zip> *
3GPP TS 36.300, September 2015 (2015-09-01), pages 67 - 69,120- 121, XP055377841 *
ERICSSON: "RRC Idle/Connected mode mismatch", 3GPP TSG-RAN WG2#95 R2-165306, 12 August 2016 (2016-08-12), XP051133821, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/tsg_ran/WG2_RL2/TSGR2_95/Docs/R2-165306.zip> *

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