WO2013046282A1 - Procédé et appareil de commande de rétablissement dans un système de télécommunications - Google Patents

Procédé et appareil de commande de rétablissement dans un système de télécommunications Download PDF

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Publication number
WO2013046282A1
WO2013046282A1 PCT/JP2011/005539 JP2011005539W WO2013046282A1 WO 2013046282 A1 WO2013046282 A1 WO 2013046282A1 JP 2011005539 W JP2011005539 W JP 2011005539W WO 2013046282 A1 WO2013046282 A1 WO 2013046282A1
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WO
WIPO (PCT)
Prior art keywords
base station
mobile terminal
cell
establishment
radio link
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Application number
PCT/JP2011/005539
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English (en)
Inventor
Hong Tat Toh
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Panasonic Corporation
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Publication date
Application filed by Panasonic Corporation filed Critical Panasonic Corporation
Priority to PCT/JP2011/005539 priority Critical patent/WO2013046282A1/fr
Publication of WO2013046282A1 publication Critical patent/WO2013046282A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment

Definitions

  • This invention pertains to mobile communications network. More specifically, it relates to re-attempt re-establishment procedure after the selected cell to perform re-establishment becomes non-suitable. Such re-attempt procedure should enable Mobile Terminal in heterogeneous environment to recover connection faster in a mobile communication system.
  • a Mobile Terminal In a mobile communication system (e.g. 3GPP Long-term Evolution, LTE Advanced), a Mobile Terminal has the capability to recover connection based on recovery procedures. This recovery capability is known as Re-establishment or NAS (non-access stratum) Recovery. Both Re-establishment and NAS Recovery procedures are used to recover connection upon connection failure.
  • Re-establishment In a mobile communication system (e.g. 3GPP Long-term Evolution, LTE Advanced), a Mobile Terminal has the capability to recover connection based on recovery procedures. This recovery capability is known as Re-establishment or NAS (non-access stratum) Recovery. Both Re-establishment and NAS Recovery procedures are used to recover connection upon connection failure.
  • NAS non-access stratum
  • a mobile communication system (100) in a homogeneous environment is presented.
  • the Mobile Terminal (114) is located near the cell edge of Base Station (108). Due to bad radio reception, the Mobile Terminal (114) encounters radio link failure such that the Mobile Terminal (114) will start cell selection procedure.
  • a suitable cell e.g. Base Station 110
  • the Mobile Terminal (114) will trigger re-establishment procedure.
  • the suitable cell that is selected by the Mobile Terminal (114) should be one of the cells under the Base Station in which Mobile Terminal context is stored i.e. prepared cell. Otherwise re-establishment procedure will be failed.
  • the Mobile Terminal (114) can recover connection with Base Station (110).
  • the Mobile Terminal (114) will encounter re-establishment failure.
  • the Mobile Terminal (114) will disconnect the connection with Base Station (110) and proceed to idle mode.
  • the Mobile Terminal (114) will then trigger NAS Recovery procedure.
  • the Mobile Terminal (114) will perform an establishment procedure in order to recover the connection with the Base Station.
  • the Mobile Terminal (114) upon the Mobile Terminal (114) in connected mode encounter radio link failure as in step 202, the Mobile Terminal (114) will start to search for suitable cell to camp on (204). Upon a suitable cell is detected, the Mobile Terminal (114) will select that cell to camp on (206). For example, as illustrate in Figure 1, Base Station (110) which covers a macro cell (106) is selected by Mobile Terminal (114).
  • the Mobile Terminal (114) Upon a suitable cell is selected, the Mobile Terminal (114) will send RRC Connection Reestablishment Request (208). However, upon the Mobile Terminal (114) detect the selected cell (i.e. Base Station (110)) becomes non-suitable due to cell selection criteria, similar to that specified in ⁇ NPL 3 ⁇ , is not met (210) before the reception of the response (212), the Mobile Terminal (114) will not reattempt re-establishment procedure and consider re-establishment has failed. This is because in homogeneous environment as illustrated in Figure 1, to select another cell for re-establishment is likely to select non-prepared cell i.e. another Base Station, in which Re-establishment Request will be responded by Re-establishment Reject i.e. another re-establishment is likely to be failed.
  • the selected cell i.e. Base Station (110)
  • Re-establishment Request will be responded by Re-establishment Reject i.e. another re
  • the Mobile Terminal (114) will consider re-establishment failure, and establishes RRC (radio resource control) connection again i.e. NAS Recovery procedure (218, 220, 222).
  • RRC radio resource control
  • NAS recovery involves more signaling load and involves packet loss, while it can recover connection at any cell regardless the cell is prepared or not (i.e. cell under Base Station in which Mobile Terminal Context is stored, or cell NOT under the Base Station).
  • This invention introduces a new procedure for Mobile Terminal in heterogeneous environment to support re-attempt re-establishment procedure after the event that the selected cell for re-establishment becomes non-suitable.
  • the Mobile Terminal will perform cell selection procedure to find suitable cell.
  • the Mobile Terminal Upon suitable cell is detected, the Mobile Terminal will check if the synchronization between the Mobile Terminal and the Base Station is maintained; and no failure signaling message is received. Upon the above condition is met, the Mobile Terminal will re-attempt re-establishment procedure.
  • the present invention enables Base Station to control whether another cell selection to re-attempt re-establishment is allowed or not after the event that the selected cell for re-establishment becomes non-suitable.
  • the Base Station (304) which covers (or provides) a small cell (302) exist within the coverage of macro cell (102).
  • a small cell (302) may be, for example, a pico cell.
  • the Mobile Terminal (114) which is connected to the Base Station (108) covering macro cell (102) may select a Base Station (304) covering small cell (302) for re-establishment procedure.
  • Mobile Terminal (114) will trigger NAS Recovery procedure.
  • Mobile Terminal (114) is likely to still be in the coverage of the Base Station (108) covering the macro cell (102), in which the UE's context is stored i.e. re-establishment can be successful.
  • the object of the present invention is to remove extra operation in the needs to proceed to idle mode and trigger connection establishment procedure by Mobile Terminal (114) in a heterogeneous environment.
  • the object of the present invention is to avoid unnecessary re-attempt re-establishment.
  • the solution is, in heterogeneous environment, when the selected cell becomes non-suitable during re-establishment, Mobile Terminal re-attempts re-establishment procedure on another selected cell.
  • Base Station broadcasts a flag to indicate Mobile Terminal to use the above mentioned algorithm.
  • Figure 1 illustrates the system architecture that supports the re-establishment procedure by Mobile Terminal according to the current art procedure.
  • Figure 2 illustrates an operation sequence of the current art procedure in re-establishment procedure by Mobile Terminal in the architecture as shown in Figure 1.
  • Figure 3 illustrates the system architecture that supports the re-attempt re-establishment procedure by Mobile Terminal according to the present invention.
  • Figure 4 illustrates an operation sequence of the present invention in re-attempting re-establishment procedure by Mobile Terminal in the architecture as shown in Figure 1.
  • Figure 5 illustrates an example architecture of a Base Station that implements the present invention.
  • Figure 6 illustrates an example architecture of a Mobile Terminal that implements the present invention.
  • Figure 7 illustrates an operation logic of the Mobile Terminal to re-attempt re-establishment procedure.
  • Figure 8 illustrate an operation logic for the Mobile Terminal to re-attempt re-establishment procedure upon allowable.
  • the Mobile Terminal (114) upon the Mobile Terminal (114) encounters radio link failure, the Mobile Terminal (114) will start to search for suitable cell to camp on via cell selection procedure. Upon a suitable cell is detected, the Mobile Terminal (114) will select that cell to camp on (402). For example, as illustrate in Figure 4, Base Station (304) which is covering a pico cell (302) is selected by Mobile Terminal (114).
  • the Mobile Terminal (114) Upon a suitable cell is selected, the Mobile Terminal (114) will configure the parameters for re-establishment and send to Base Station (304) via RRC Connection Reestablishment Request (404). However, upon the Mobile Terminal (114) detect the selected cell (i.e. Base Station (304)) becomes non-suitable due to cell selection criteria, similar to that specified in ⁇ NPL 3 ⁇ , is not met (406) before the reception of RRC Connection Reestablishment or RRC Connection Reestablishment Reject (408), the Mobile Terminal (114) will continue to perform cell selection procedure to detect suitable cell (410). Upon a suitable cell is detected, the Mobile Terminal (114) will select that cell to camp on (412).
  • the selected cell i.e. Base Station (304)
  • cell selection criteria similar to that specified in ⁇ NPL 3 ⁇
  • Base Station (108) which is covering a macro cell is selected by Mobile Terminal (114).
  • the Mobile Terminal (114) will check for feasibility to re-attempt re-establishment procedure.
  • the Mobile Terminal (114) and Base Station (108) had to be maintained synchronized.
  • a typical synchronized mechanism may consider the following option:
  • a configured timer E.g. A configured timer is broadcasted in the macro cell (102) covered by Base Station (108). Such timer will start upon radio link failure detected. This configured timer will only be stopped by Mobile Terminal (114) upon re-attempt re-establishment occurs in the macro cell (108). Upon the configured timer expired, the Mobile Terminal (114) is not allow to perform re-attempt re-establishment in the macro cell (102) covered by Base Station (108) after re-establishment failure.
  • the Mobile Terminal (114) By fulfilling the above condition, the Mobile Terminal (114) will configure the parameters for re-establishment and send to Base Station (108) via RRC Connection Re-establishment Request (414). Based on the reception of request message for re-establishment, the Base Station (108) will configure the recovery parameters to Mobile Terminal (114) via RRC Connection Re-establishment (416). With the success configuration of the recovery procedure, the Mobile Terminal (114) will acknowledge to the Base Station (108) via RRC Connection Re-establishment Complete (418).
  • the Base Station (108) comprises three major components, namely the Receiver Unit (RU) (502), Reestablish Management Unit (RMU) (506) and Transmitter Unit (TU) (510).
  • RU Receiver Unit
  • RMU Reestablish Management Unit
  • TU Transmitter Unit
  • the RMU (506) After received uplink signaling message from RU (502) via interface 504, the RMU (506) will decide on the intended cell for recovery configuration to the Mobile Terminal (114). For example, the intended cell to support re-attempt re-establishment should be a prepared cell before the Base Station (108) can start to prepare recovery configuration information.
  • the RMU (506) will pass the recovery configuration information to TU (510) via interface 508.
  • the Base Station (108) will transmit the recovery configuration information to Mobile Terminal (114) via downlink dedicated signaling, as shown in Figure 4.
  • RU Receiver Unit
  • MCU Measurement Control Unit
  • RCU Reestablishment Control Unit
  • RU Transmitter Unit
  • the RU (602) is in charge of receiving the downlink message.
  • the Mobile Terminal (114) will receive the RRC Connection Re-establishment message from Base Station (108).
  • RU (602) Upon message is successfully received, RU (602) will pass the received message to RCU (610) via interface 604.
  • the MCU (606) is in charge of handling the measured and detected cells based on the cell selection criteria, similar to that specified in ⁇ 3 ⁇ .
  • the MCU (606) will start to monitor the cells as to determine suitable cell.
  • the MCU (606) will pass this suitable cell to RCU (610) via interface (608).
  • the RCU (610) is in charge of checking if the synchronization between the Mobile Terminal (114) and the Base Station (108) is maintained before the Mobile Terminal (114) can start to perform re-attempt re-establishment procedure. Upon the above synchronized condition is fulfilled, the RCU (610) will configure the re-establishment request parameters for the re-attempt re-establishment procedure and pass to TU (614) via interface 612. Thus, the Mobile Terminal (114) will send to the Base Station (108) via dedicated signaling, as shown in Figure 4. The protocol used between them is as specified in ⁇ NPL 2 ⁇ .
  • Receiver Unit (602), Measurement Control Unit (MCU) (606), Reestablishment Control Unit (RCU) (610) and Transmitter Unit (TU) (614) is presented.
  • the MCU (606) upon MCU (606) detect radio link failure, as in step 702, the MCU (606) will start to perform cell selection procedure, as in step 704. Upon a cell is detected, the MCU (606) will check if that cell is suitable cell based on cell selection criteria, similar to that specified in ⁇ NPL 3 ⁇ , as in step 706. If the measured result of the detected cell has satisfied the above criteria, the MCU (606) will attempt re-establishment procedure, as in step 708. Otherwise, the MCU (606) will continue to monitor other cell. During re-establishment procedure, the MCU (606) will continue to monitor the radio link of the suitable cell.
  • the MCU (606) will start to perform cell selection procedure as to detect any suitable cell, as in step 712. Upon suitable cell not detected, the MCU (606) will continue to monitor other cell. If a suitable cell is detected and that cell is a potential prepared cell (e.g. Base Station (108) as illustrate in Figure 4), as in step 714, the RCU (610) will check if the synchronization between the Mobile Terminal (114) and the Base Station (108) is maintained or not.
  • a suitable cell is detected and that cell is a potential prepared cell (e.g. Base Station (108) as illustrate in Figure 4)
  • the RCU (610) will check if the synchronization between the Mobile Terminal (114) and the Base Station (108) is maintained or not.
  • the RCU (610) Upon synchronization criteria have fulfilled, the RCU (610) will start to configure the re-establishment request parameters for the re-attempt re-establishment procedure, as in step 716.
  • Such parameters information like physical cell identity information, connection radio network temporary identity information, security related information, etc. This information could be obtained from the stored information of the Mobile Terminal (114).
  • the RCU (610) Once the relevant information for re-attempt re-establishment procedure is obtained, the RCU (610) will pass this information to TU (614) and send to Base Station (108) via dedicated signaling, as in step 718, as shown in Figure 4.
  • the protocol used between them is as specified in ⁇ 2 ⁇ .
  • the RCU (610) Upon the triggered of re-establishment procedure in the selected cell, the RCU (610) will read and stored the re-attempt re-establishment control information via broadcast control signaling, as in step 802, e.g. System Information Block message as defined in ⁇ NPL 2 ⁇ .
  • a typical re-attempt re-establishment control information may consider the following option:
  • a broadcasted control flag E.g. A control flag is broadcasted in the Base Station (110, 112). Such control flag could be set as, e.g. allowed or not allowed, for the Mobile Terminal (114) to carrier out re-attempt re-establishment upon the cell for re-establishment becomes non-suitable.
  • the MCU (606) will continue to monitor the radio condition of the selected cell for re-establishment.
  • the RCU (610) will based on the stored re-attempt re-establishment control information to check if the Mobile Terminal (114) is allow to re-attempt re-establishment or not, as in step 804.
  • the RCU (610) will proceed to trigger re-attempt re-establishment procedure. If re-attempt re-establishment is not allowed, the RCU (610) will proceed to idle mode, as in step 806 and consider the selected cell for re-establishment has failed.
  • control to trigger re-attempt re-establishment procedure from Base Station is just one of the possible approaches.

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

Abstract

L'invention porte sur un terminal mobile dans un environnement hétérogène permettant d'éliminer une opération supplémentaire dans le besoin de passer en mode veille et de déclencher une procédure d'établissement de connexion. De plus, l'évitement d'une nouvelle tentative de rétablissement non nécessaire est présenté. Un système de communication (300) comprend une première station de base (108) pour créer une macro-cellule (102), une seconde station de base (304) pour créer une pico-cellule (302) dans la zone de couverture de la macro-cellule (102), et un terminal mobile (114). Le terminal mobile (114) comprend un émetteur récepteur configuré pour se connecter par liaison radio à la première station de base (108) et à la seconde station de base (304), et une unité de commande de rétablissement configurée pour rétablir une liaison radio par l'intermédiaire d'une procédure de connexion RFC (gestion des ressources radio) avec la première station de base (108) après déconnexion d'une liaison radio d'avec la seconde station de base (304).
PCT/JP2011/005539 2011-09-30 2011-09-30 Procédé et appareil de commande de rétablissement dans un système de télécommunications WO2013046282A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11690122B2 (en) 2018-04-04 2023-06-27 Vivo Mobile Communication Co., Ltd. Connection re-establishment method and related device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1816794A2 (fr) * 2004-03-05 2007-08-08 Samsung Electronics Co., Ltd Système et procédé de transfert pour minimiser le retard de service dû à un effet de ping pong dans le système de communication à accès sans fil à large bande (BWA)

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1816794A2 (fr) * 2004-03-05 2007-08-08 Samsung Electronics Co., Ltd Système et procédé de transfert pour minimiser le retard de service dû à un effet de ping pong dans le système de communication à accès sans fil à large bande (BWA)

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 10)", 3GPP STANDARD; 3GPP TS 36.300, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, no. V10.3.0, 5 April 2011 (2011-04-05), pages 1 - 197, XP050477175 *
"3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification (Release 10)", 3GPP STANDARD; 3GPP TS 36.331, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, no. V10.1.0, 30 March 2011 (2011-03-30), pages 1 - 290, XP050476531 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11690122B2 (en) 2018-04-04 2023-06-27 Vivo Mobile Communication Co., Ltd. Connection re-establishment method and related device

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