JP5108856B2 - Mobile communication method, radio base station, switching station, mobile station - Google Patents

Mobile communication method, radio base station, switching station, mobile station Download PDF

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Publication number
JP5108856B2
JP5108856B2 JP2009252477A JP2009252477A JP5108856B2 JP 5108856 B2 JP5108856 B2 JP 5108856B2 JP 2009252477 A JP2009252477 A JP 2009252477A JP 2009252477 A JP2009252477 A JP 2009252477A JP 5108856 B2 JP5108856 B2 JP 5108856B2
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base station
radio base
identification information
handover
destination candidate
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JP2011097543A (en
Inventor
アンダルマワンティ ハプサリ ウリ
秀明 高橋
健志 岡本
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株式会社エヌ・ティ・ティ・ドコモ
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0055Transmission and use of information for re-establishing the radio link
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W84/00Network topologies
    • H04W84/02Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04Large scale networks; Deep hierarchical networks
    • H04W84/042Public Land Mobile systems, e.g. cellular systems
    • H04W84/045Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W92/00Interfaces specially adapted for wireless communication networks
    • H04W92/04Interfaces between hierarchically different network devices
    • H04W92/045Interfaces between hierarchically different network devices between access point and backbone network device

Description

  The present invention relates to a mobile communication method, a radio base station, an exchange station, and a mobile station.

  In an LTE (Long Term Evolution) mobile communication system, a handover source radio base station identifies a handover destination candidate radio base station eNB / HeNB in a HO Required message transmitted to an exchange MME (Mobility Management Entity) It is necessary to specify the Target ID.

  As shown in FIG. 8, the information element “Global eNB ID” and the information element “Selected TAI” are included in the information element “Target ID” included in the HO Required message in the Intra-LTE handover.

  Also, as illustrated in FIG. 8, the information element “eNB ID” included in the information element “Global eNB ID” includes a 20-bit length Macro eNB ID (identification information of the radio base station eNB) or a 28-bit length Home. One of the eNB IDs (identification information of the radio base station HeNB) is set.

  Further, in the LTE-Rel.8 mobile communication system, as shown in FIG. 9, the mobile station UE includes only the PCI (Physical Cell ID) (Target PCI) of the handover destination candidate cell, that is, the handover destination candidate. Since it is configured to transmit the Measurement Report that does not include the identification information (Global eNB ID) of the radio base station and the identification information (TAI: Tracking Area ID) of the handover destination candidate tracking area, the handover source radio base station eNB # 1 refers to NRT (Neibo Relation Table) based on the PCI, and identifies handover destination candidate radio base station identification information (Global eNB ID) and handover destination candidate tracking area. It was necessary to extract information (TAI).

  Therefore, the mobile station UE performs S1 handover to a radio base station eNB / HeNB (radio base station eNB # 2 in the example of FIG. 9) that is not registered in the NRT of the handover source radio base station eNB # 1. I can't.

  On the other hand, in the mobile communication system of the LTE-Rel.9 scheme, the mobile station UE can transmit a measurement report including E-CGI (E-UTRAN Cell Global Identity) and TAI related to a handover destination candidate cell. The former radio base station S-eNB can acquire a Global eNB ID and a TAI that constitute a Target ID for identifying a handover destination candidate radio base station that is not registered in the NRT.

  FIG. 10 shows an example of information elements included in the information element “E-CGI” included in the Measurement Report.

  Therefore, the handover source radio base station performs HO Required including the Target ID even for the handover destination candidate radio base station eNB / HeNB not registered in the NRT and the handover destination candidate radio base station HeNB under the gateway device HeNB-GW. Although the message can be transmitted, it cannot be determined whether the handover destination candidate radio base station included in the Measurement Report transmitted by the mobile station UE is the radio base station eNB or the radio base station HeNB.

  That is, the E-CGI included in the Measurement Report transmitted by the mobile station UE does not include information for determining the type (eNB / HeNB) of the handover destination candidate radio base station.

  Note that the lower 28 bits of E-CGI are configured by Cell ID, and when the handover destination candidate radio base station is radio base station eNB, Cell ID is configured by Home eNB ID, and the handover destination When the candidate radio base station is the radio base station HeNB, the Cell ID is configured by a 20-bit macro eNB ID and an 8-bit radio base station HeNB subordinate cell identification information.

  Further, the switching center MME searches for an entry that matches the Global eNB ID set in the information element “Global eNB ID” in the HO Required message received from the handover source radio base station.

  Here, when such an entry is not registered and the length of the information element “eNB ID” in the information element “Global eNB ID” is 20 bits, the exchange MME receives the handover source radio base station. In response, the HO Failure message is transmitted.

  On the other hand, when such an entry is not registered and the length of the information element “eNB ID” in the information element “Global eNB ID” is 28 bits, the exchange MME receives the information from the handover source radio base station. The HO Request message including the TAI set in the information element “Selected TAI” in the received HO Required message is transmitted.

3GPP TS36.300 3GPP TS 36.413

  However, in the above-described mobile communication system, when the S1 handover is performed, the handover source radio base station, based on the E-CGI included in the Measurement Report transmitted by the mobile station UE, Since the type (eNB / HeNB) cannot be determined, the length (20 bits or 28 bits) of the information element “Global eNB ID” in the information element “Target ID” in the HO Required message may be determined. There was a problem that it was not possible.

  Therefore, the present invention has been made in view of the above-described problems, and realizes S1 handover even when radio base stations having identification information eNB IDs of radio base stations having different lengths coexist. An object of the present invention is to provide a mobile communication method, a radio base station, an exchange, and a mobile station.

  A first feature of the present invention is a mobile communication method, in which a radio base station performs the exchange when setting up a connection with the exchange or when changing the configuration of the radio base station. A step of notifying the station of the identification information of the radio base station and the identification information of the tracking area, and the switching station associates the received identification information of the radio base station with the identification information of the tracking area. And when the wireless base station is operating in a first access mode that allows access to all mobile stations, in step A, The wireless base station identification information of the first predetermined length is notified, and in step A, when the wireless base station is operating in an access mode other than the first access mode, In contrast, the second place And gist to notify the identification information on the radio base station of the length.

  A second feature of the present invention is a mobile communication method, in which a radio base station sets up a connection with a gateway device or changes the configuration of the radio base station. Informing the device of the identification information of the radio base station and the identification information of the tracking area, the gateway device associates the received identification information of the radio base station with the identification information of the tracking area. Step B of managing, Step C in which the gateway device notifies the switching center of the identification information of the gateway device and the identification information of the tracking area, and the identification information of the gateway device received by the switching center And the process D for managing the identification information of the tracking area in association with each other, and in the process A, the radio base stations are all When operating in the first access mode permitting access to the mobile station, the switching center is notified of the identification information of the radio base station having the first predetermined length, and in the step A, The gist of the invention is that, when operating in an access mode other than the first access mode, the radio base station notifies the exchange station of identification information of the radio base station having a second predetermined length. .

  A third feature of the present invention is a radio base station, and when setting up a connection with an exchange, or when changing the configuration of the radio base station, A notification unit configured to notify the identification information of the radio base station and the identification information of the tracking area, and the notification unit allows the radio base station to access all mobile stations When operating in the first access mode, the switching center is configured to notify the identification information of the wireless base station having a first predetermined length, and the notification unit includes the wireless base station When the station is operating in an access mode other than the first access mode, it is configured to notify the exchange station of identification information of the radio base station having a second predetermined length. Is the gist.

  A fourth feature of the present invention is a radio base station, and when setting up a connection with a gateway device or when changing the configuration of the radio base station, A notification unit configured to notify the identification information of the radio base station and the identification information of the tracking area, and the notification unit allows the radio base station to access all mobile stations When operating in the first access mode, the switching center is configured to notify the identification information of the wireless base station having a first predetermined length, and the notification unit includes the wireless base station When the station is operating in an access mode other than the first access mode, it is configured to notify the exchange station of identification information of the radio base station having a second predetermined length. The gist

  According to a fifth aspect of the present invention, there is provided a switching station which is configured to manage the radio base station identification information and the tracking area identification information in association with each other, and receive from the handover source radio base station. If the identification information of the handover destination candidate radio base station of the first predetermined length included in the first handover request signal related to the mobile station is not managed, a handover failure signal is transmitted to the handover source radio base station Without including the identification information of the handover destination candidate tracking area included in the first handover request signal for the handover destination candidate radio base station or the gateway device that manages the handover destination candidate radio base station. And a transmitter configured to transmit a handover request signal.

  A sixth feature of the present invention is a mobile station configured to determine an access mode in which the handover destination candidate radio base station is operating based on broadcast information received from the handover destination candidate radio base station. And a measurement report transmitter configured to transmit a measurement report including identification information of the handover destination candidate radio base station to the handover source radio base station, and the measurement report When the transmission unit determines that the handover destination candidate radio base station is not operating in the first access mode that allows access to all mobile stations, the transmission unit The measurement report transmission unit is configured to transmit a measurement report including a determination result as to whether or not access is permitted. Candidate radio base station, when it is determined to be operating in the first access mode, and summarized in that is configured to transmit a measurement report does not include the determination result.

  A seventh feature of the present invention is a radio base station that receives a measurement report that does not include a determination result as to whether or not the mobile station is allowed to access the handover destination candidate radio base station. In this case, the gist of the present invention is to include a transmitter configured to transmit a first handover request signal including identification information of the handover destination candidate radio base station having the first predetermined length to the exchange. .

  As described above, according to the present invention, a mobile communication method capable of realizing S1 handover even when radio base stations having identification information eNB ID of radio base stations having different lengths are mixed, Radio base stations, switching stations, and mobile stations can be provided.

1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention. FIG. 2 is a functional block diagram of a radio base station HeNB according to the first embodiment of the present invention. It is a functional block diagram of the exchange MME which concerns on the 1st Embodiment of this invention. It is a functional block diagram of gateway apparatus HeNB-GW which concerns on the 1st Embodiment of this invention. FIG. 3 is a functional block diagram of a mobile station UE according to the first embodiment of the present invention. It is a figure for demonstrating operation | movement of the mobile communication system which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating operation | movement of the mobile communication system which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating the information element "Global eNB ID" contained in the information element "Target ID" contained in the "HO Required" message and the information element "Target ID" transmitted in the LTE mobile communication system. [Fig. 6] Fig. 6 is a diagram for describing a problem in S1 handover performed in an LTE-Rel.8 mobile communication system. 6 is a diagram for explaining an information element “E-CGI” included in a “Measurement Report” message transmitted in an LTE-Rel.9 mobile communication system. FIG.

(Configuration of mobile communication system according to the first embodiment of the present invention)
The configuration of the mobile communication system according to the first embodiment of the present invention will be described with reference to FIG. 1 to FIG.

  The mobile communication system according to the present embodiment is an LTE mobile communication system, and as shown in FIG. 1, an exchange MME, a gateway device HeNB-GW, radio base stations eNB # 0, eNB # 1, HeNB # 2 and HeNB # 3. The radio base station HeNB # 2 is accommodated under the gateway device HeNB-GW.

  Here, in the radio base station eNB # 1, 20-bit length eNB ID # 10, Open mode PCI # 1, 28-bit length E-CGI # 1 and TAI # A are set, and the CSG ID is set. (Closed Subscriber Group Identity) and CSG Indicator are not set.

  Also, the closed mode or the hybrid mode is set in the radio base station HeNB # 3, the eNB ID # 30 of 28-bit length, the PCI # 3 for the closed mode or the hybrid mode, and the E-CGI # of 28-bit length 3 and TAI # B are set, and a CSG ID is set. Here, the CSG Indicator is set when the Closed mode is set in the radio base station HeNB # 3, and the CSG Indicator is not set when the Hybrid mode is set.

  Furthermore, the radio base station HeNB # 2 is set to the Open mode, and the 20-bit length eNB ID # 20, the Open mode PCI # 2, the 28-bit length E-CGI # 2 and the TAI # B It is set and CSG ID and CSG Indicator are not set.

  As shown in FIG. 2, the radio base stations HeNB # 2 and HeNB # 3 (hereinafter, representatively represented as radio base stations HeNB) include a management unit 11, an access mode setting unit 12, and a broadcast information transmission unit 13. And a notification unit 14 and a handover processing unit 15.

  The management unit 11 includes an access mode (Closed / Hybrid / Open mode) in which the radio base station HeNB is operating, identification information eNB ID of the radio base station HeNB, identification information TAI of the tracking area, subordinate to the radio base station HeNB, It is configured to manage PCI related to a cell, E-CGI related to a cell under the radio base station HeNB, and the like.

  Here, the Hybrid mode is an access mode in which a mobile communication service can be provided in a differentiated manner for each of a registered mobile station (Member) and an unregistered mobile station (Non Member) in the radio base station HeNB. The mode is an access mode (first access mode) that can provide mobile communication services to all mobile stations, and the Closed mode provides mobile communication services only to registered mobile stations (Member). It is an access mode that can.

  The access mode setting unit 12 is configured to set an access mode in which the radio base station HeNB should operate. The access mode setting unit 12 may be configured to set an access mode in which the radio base station HeNB should operate according to an input operation on the radio base station HeNB, or according to an instruction via the network, The radio base station HeNB may be configured to set an access mode in which to operate.

  The broadcast information transmitting unit 13 is configured to transmit broadcast information including the above-described PCI, E-CGI, TAI, CSG ID, CSG Indicator, and the like in a cell under the radio base station HeNB.

  Here, the above-described E-CGI, TAI, CSG ID, and CSG Indicator are configured to be notified by SIB1 (System Information Block 1) that is broadcast information.

  When the notification unit 14 sets an S1 connection with the exchange MME, or when changing the configuration of the radio base station HeNB, the notification unit 14 notifies the exchange MME of the identification information eNB ID of the radio base station HeNB. The tracking area identification information TAI is notified.

  Specifically, the notification unit 14 is configured to include the identification information eNB ID of the radio base station HeNB and the identification information TAI of the tracking area in the S1 Setup message or the eNB Configuration Update message and notify the exchange MME. Has been.

  Here, when the radio base station HeNB is operating in the Open mode, the notification unit 14 provides the identification information eNB of the radio base station HeNB having a 20-bit length (first predetermined length) to the exchange MME. It is configured to notify the ID.

  On the other hand, when the radio base station HeNB is operating in the Closed / Hybrid mode, the notification unit 14 identifies the radio base station HeNB having a 28-bit length (second predetermined length) with respect to the exchange MME. It is configured to notify the eNB ID.

  In addition, when the radio base station HeNB is connected to the gateway device HeNB-GW, the notification unit 14 sets the S1 connection with the gateway device HeNB-GW, or the radio base station HeNB When changing the configuration, the gateway device HeNB-GW is configured to notify the identification information eNB ID of the radio base station HeNB and the identification information TAI of the tracking area.

  Specifically, the notification unit 14 includes the identification information eNB ID of the radio base station HeNB and the identification information TAI of the tracking area in the S1 Setup message and the eNB Configuration Update message so as to notify the gateway device HeNB-GW. It is configured.

  The handover processing unit 15 is configured to perform a handover process for the mobile station UE, for example, to transmit / receive a signal related to the handover process to / from the exchange MME.

  When the handover processing unit 15 receives a Measurement Report that does not include the Preliminary Access Check bit from the mobile station UE, the handover processing unit 15 transmits the identification information eNB ID of the 20-bit-long handover destination candidate radio base station T-HeNB to the switching center MME. Is configured to transmit a HO Required message including

  Here, the Preliminary Access Check bit is a bit indicating a determination result as to whether or not the mobile station UE is allowed to access the handover destination candidate radio base station HeNB.

  Similarly, the radio base station eNB may have the function of the handover processing unit 15.

  As shown in FIG. 3, the exchange MME includes a management unit 21, a reception unit 22, and a transmission unit 23.

  The management unit 21 is configured to manage UE CSG Subscription info indicating a CSG ID to which the mobile station UE belongs, that is, a CSG ID for identifying a CSG cell accessible by the mobile station UE.

  The management unit 21 also includes an entry including identification information eNB ID (Global eNB ID) of the radio base station eNB / HeNB under the switching center MME, tracking area identification information TAI (TAC), registration group identification information CSG ID, and the like. (ID mapping entry) is managed (see FIG. 6).

  When the radio base station eNB / HeNB under the switching center MME sets the S1 connection with the switching center MME, or when changing the configuration of the radio base station eNB / HeNB, the receiving unit 22 The radio base station eNB / HeNB is configured to acquire the identification information eNB ID of the radio base station eNB / HeNB and the identification information TAI of the tracking area from the radio base station eNB / HeNB.

  For example, the receiving unit 22 is configured to receive an S1 Setup message and an eNB Configuration Update message including the identification information eNB ID of the radio base station eNB / HeNB and the identification information TAI of the tracking area.

  Further, the receiving unit 22 is configured to receive a HO Required message related to the mobile station UE from the handover source radio base station S-eNB / S-HeNB.

  The transmission unit 23 transmits a HO Request message to the handover destination candidate radio base stations T-eNB / T-HeNB, and transmits a HO Failure message to the handover source radio base stations S-eNB / S-HeNB. Is configured to do.

  Here, the management unit 21 receives a handover destination candidate radio base station T− with a 20-bit length included in the HO Required message related to the mobile station UE received from the handover source radio base station S-eNB / S-HeNB by the reception unit 22. When the entry including the identification information eNB ID of the eNB / T-HeNB is not managed, the transmission unit 23 performs the handover without transmitting the HO Failure message to the handover source radio base station S-eNB / S-HeNB. The handover destination included in the received HO Required message for the destination candidate radio base station T-eNB / T-HeNB or the gateway apparatus HeNB-GW that manages the handover destination candidate radio base station T-eNB / T-HeNB HO Request including identification information TAI of candidate tracking area It is configured to send the message.

  As illustrated in FIG. 4, the gateway device HeNB-GW includes a management unit 31, a reception unit 32, and a transmission unit 33.

  The management unit 31 is configured to manage an entry (ID mapping entry) including identification information eNB ID, tracking area identification information TAI, and the like of the radio base station HeNB under the gateway device HeNB-GW (see FIG. 6). ).

  The receiving unit 32 is configured to receive an S1 Setup message and an eNB Configuration Update message from the radio base station HeNB under the gateway device HeNB-GW, and to receive an HO Request from the exchange MME.

  The transmission unit 33 transmits the S1 Setup message and the eNB Configuration Update message received by the reception unit 32 to the exchange MME, and the reception unit 32 transmits the radio base station HeNB under the gateway device HeNB-GW. It is configured to transmit the received HO Request.

  For example, when the information element “Access Mode” is not included in the HO Request received by the reception unit 32, the transmission unit 33 determines that the handover destination candidate radio base station HeNB is operating in the Open mode. The HO Request is transmitted to the radio base station HeNB specified by the upper 20 bits of the eNB ID in the ID mapping entry managed by the management unit 31.

  On the other hand, when the information element “Access Mode” is included in the HO Request received by the reception unit 32, the transmission unit 33 determines that the handover destination candidate radio base station HeNB is operating in the Closed / Hybrid mode. The HO Request is transmitted to the radio base station HeNB determined by the upper 28 bits of the eNB ID in the ID mapping entry managed by the management unit 31.

  As illustrated in FIG. 5, the mobile station UE includes a measurement unit 41, a broadcast information reception unit 42, a determination unit 43, and a measurement report transmission unit 44.

  The measurement unit 41 is configured to perform measurement (measurement processing) in neighboring cells in accordance with Measurement Configuration notified by the radio base station eNB.

  The broadcast information receiving unit 42 is configured to receive broadcast information in neighboring cells.

  The determination unit 43 is configured to determine an access mode in which the handover destination candidate radio base station T-HeNB is operating based on broadcast information received from the handover destination candidate radio base station T-HeNB.

  Further, the determination unit 43 is configured to perform the Preliminary Access Check, that is, to determine whether or not the mobile station UE is allowed to access the handover destination candidate radio base station T-HeNB.

  The measurement report transmission unit 44 transmits a measurement report (measurement report) including the identification information eNB ID of the handover destination candidate radio base stations T-eNBT / T-HeNB to the handover source radio base station S-eNB. It is configured.

  Here, when the determination unit 43 determines that the handover destination candidate radio base station T-HeNB is operating in the Closed / Hybrid mode, the measurement report transmission unit 44 sends a Measurement Report including the Preliminary Access Check bit. Configured to send.

  On the other hand, when the determination unit 43 determines that the handover destination candidate radio base station T-HeNB is operating in the Open mode, the measurement report transmission unit 44 transmits a Measurement Report that does not include the Preliminary Access Check bit. It is configured as follows.

(Operation of the mobile communication system according to the first embodiment of the present invention)
With reference to FIG.6 and FIG.7, operation | movement of the mobile communication system which concerns on the 1st Embodiment of this invention is demonstrated.

  First, referring to FIG. 6, in the mobile communication system according to the first embodiment of the present invention, the radio base stations eNB # 1 / HeNB # 2 / HeNB # 3 are configured to perform S1 between the exchange MME. The operation when setting the connection or changing the configuration of the radio base stations eNB # 1 / HeNB # 2 / HeNB # 3 will be described.

  As shown in FIG. 6, in step S1, the radio base station eNB # 1 that manages a normal macro cell sets a 20-bit length to the switching center MME when setting up an S1 connection with the switching center MME. When the S1 Setup message including the identification information eNB ID # 10 of the radio base station eNB # 1 and the tracking area identification information TAI # A is transmitted to change the configuration of the radio base station eNB # 1, In contrast, an eNB Configuration Update message including the identification information eNB ID # 10 of the radio base station eNB # 1 having a 20-bit length and the tracking area identification information TAI # A is transmitted.

  In step S2A, when the radio base station HeNB # 2 operating in the Open mode sets up an S1 connection with the gateway apparatus HeNB-GW, the radio base station HeNB-GW has a 20-bit length radio to the gateway apparatus HeNB-GW. When the S1 Setup message including the identification information eNB ID # 20 of the base station HeNB # 2 and the tracking area identification information TAI # B is transmitted and the configuration of the radio base station eNB # 1 is changed, the gateway device HeNB-GW On the other hand, an eNB Configuration Update message including the identification information eNB ID # 20 of the 20-bit long radio base station HeNB # 2 and the tracking area identification information TAI # B is transmitted.

  In step S2B, the gateway device HeNB-GW transmits an S1 Setup message including the identification information eNB ID # 100 of the gateway device HeNB-GW having a 20-bit length and the tracking area identification information TAI # B to the exchange MME. Then, an eNB Configuration Update message including the identification information eNB ID # 100 of the gateway device HeNB-GW having a 20-bit length and the tracking area identification information TAI # B is transmitted to the switching center MME.

  In step S3, the radio base station HeNB # 3 operating in the Closed / Hybrid mode sets a 28-bit long radio base station to the exchange MME when setting up an S1 connection with the exchange MME. When the S1 Setup message including the identification information eNB ID # 30 of the HeNB # 3 and the identification information TAI # B of the tracking area is transmitted and the configuration of the radio base station HeNB # 3 is changed, An eNB Configuration Update message including the identification information eNB ID # 30 of the radio base station HeNB # 3 having a bit length and the tracking area identification information TAI # B is transmitted.

  As a result, as shown in FIG. 6, the switching center MME has an entry that associates the identification information eNB ID # 10 of the radio base station eNB # 1 having a 20-bit length with the identification information TAI # A of the tracking area, and has a 20-bit length. The entry that associates the identification information eNB ID # 100 of the gateway device HeNB-GW with the identification information TAI # B of the tracking area, and the identification information eNB ID # 30 of the 28-bit radio base station HeNB # 3 and the tracking area An entry that associates with information TAI # B is created and managed.

  Second, with reference to FIG. 7, in the mobile communication system according to the first embodiment of the present invention, the S1 handover process of the mobile station UE from the radio base station eNB # 0 to the radio base station HeNB # 2 will be described. To do.

  As illustrated in FIG. 7, in step S101, the mobile station UE transmits a Measurement Report including PCI # 2 related to a cell under the radio base station HeNB # 2 to the radio base station eNB # 0.

  In step S102, the radio base station eNB # 0 requests the mobile station UE to transmit E-CGI related to a cell under the radio base station HeNB # 2.

  In step S103, the mobile station UE receives SIB1 transmitted by the radio base station HeNB # 2, and receives E-CGI # 2 and tracking area identification information TAI # B related to a cell under the radio base station HeNB # 2. To get.

  In step S104, the mobile station UE sends a measurement report including E-CGI # 2 and tracking area identification information TAI # B related to the cell under the radio base station HeNB # 2 to the radio base station eNB # 0. Send.

  Here, since the mobile station UE determines that the radio base station HeNB # 2 is operating in the Open mode, the mobile station UE does not perform the Preliminary Access Check.

  In step S105, the radio base station eNB # 0 does not include the Preliminary Access Check bit in the received Measurement Report, so the upper 20 bits of the E-CGI included in the received Measurement Report (the radio base station) The identification information eNB ID # 20) of the station HeNB # 2 is set to the information element “eNB ID” in the information element “Global eNB ID” in the information element “Target eNB-ID” in the HO Required message.

  In step S106, the radio base station eNB # 0 sends the identification information eNB ID # 20 of the radio base station HeNB # 2, the tracking area identification information TAI # B, and the radio base station HeNB to the exchange MME. # 2 transmits a HO Required message including Access Mode (Open) indicating the access mode in operation.

  When the switching center MME does not manage the entry including the identification information eNB ID # 20 of the radio base station HeNB # 2 having a 20-bit length included in the HO Required message received from the radio base station eNB # 0 in step S107 Without transmitting the HO Failure message to the radio base station eNB # 0, the HO Request message including the tracking area identification information TAI # B included in the HO Required message is transmitted to the gateway device HeNB-GW. Is transmitted, that is, TAI based routing is performed.

  Here, since the switching center MME determines that the radio base station HeNB # 2 is operating in the Open mode based on the Access Mode included in the HO Required message received from the radio base station eNB # 0, the gateway apparatus HeNB -The information element "Access Mode" is not included in the HO Request message transmitted to the GW.

  In step S108, the gateway device HeNB-GW determines that the information element “Access Mode” is not included in the received HO Request message, and in step S109, the tracking area identification information TAI included in the HO Request message. Identification information eNB ID # 20 and tracking area identification of radio base station HeNB # 2 having a 20-bit length for radio base station HeNB # 2 specified by 20 bits of eNB ID # 20 associated with #B A HO Request message including information TAI # B is transmitted.

  In Step 109, the gateway device HeNB-GW identifies the Cell ID from the information element “E-CGI” in “S-eNB to T-eNB Transparent Container” included in the HO Request message, and the 20-bit eNB A HO Request message including identification information eNB ID # 20 of the radio base station HeNB # 2 having a 20-bit length and tracking area identification information TAI # B is transmitted to the radio base station HeNB # 2 specified by the ID # 20 May be.

(Operations and effects of the mobile communication system according to the first embodiment of the present invention)
In the existing LTE mobile communication system, when the switching center MME receives a HO Required message including the identification information eNB ID of the handover destination candidate radio base station T-HeNB having a 20-bit length that is not registered as an entry, The HO Failure message was transmitted to the original radio base station S-HeNB, and S1 handover could not be executed.

  On the other hand, according to the mobile communication system according to the first embodiment of the present invention, when the S1 handover is executed, the switching center MME does not register as a 20-bit-length handover destination candidate radio that is not registered as an entry. Even when the HO Required message including the identification information eNB ID of the base station T-HeNB is received, the TAI based routing is performed without transmitting the HO Failure message to the handover source radio base station S-HeNB. Thus, S1 handover can be executed.

  Further, according to the mobile communication system according to the first embodiment of the present invention, the mobile station UE, when the radio base station HeNB operating in the Open mode is used as a handover destination candidate radio base station, is a Preliminary Access. When transmitting a measurement report that does not include a check bit and a radio base station HeNB operating in the closed / hybrid mode is a handover destination candidate radio base station, in order to transmit a measurement report that includes a primary access check bit, The handover source radio base station includes a radio base station HeNB operating in the Clode / Hybrid mode, a radio base station eNB managing a macro cell, and a radio base station operating in the Open mode. It is possible to determine the station HeNB.

  Then, the radio base station HeNB operating in the Open mode receives the identification information eNB ID of the radio base station HeNB having the same 20-bit length as the identification information eNB ID of the radio base station eNB that manages the macro cell. Even if the handover source radio base station cannot discriminate between the radio base station eNB managing the macro cell and the radio base station HeNB operating in the Open mode in order to register with the MME, the S1 handover Can be executed.

  The characteristics of the present embodiment described above may be expressed as follows.

  The first feature of the present embodiment is a mobile communication method, in which the radio base station HeNB # 3 sets up an S1 connection with the exchange MME, or the configuration of the radio base station HeNB # 3. , The process A for notifying the exchange MME of the identification information eNB ID # 30 of the radio base station HeNB # 3 and the identification information TAI # B of the tracking area, and the exchange MME received the radio And the process B for managing the identification information eNB ID # 30 of the base station HeNB # 3 and the tracking area identification information TAI # B in association with each other. In the process A, the radio base station HeNB # 3 Wireless base station having a 20-bit length (first predetermined length) with respect to the switching center MME The identification information eNB ID # 30 of HeNB # 3 is notified, and in step A, the radio base station HeNB # 3 is exchanged when operating in the Closed / Hybrid mode (access mode other than the first access mode). The gist is to notify the station MME of the identification information eNB ID # 30 of the radio base station HeNB # 3 having a 28-bit length (second predetermined length).

  In the first feature of the present embodiment, the switching center MME receives a handover destination of 20 bits in length included in a HO Required message (first handover request signal) related to the mobile station UE received from the handover source radio base station eNB # 0. When the identification information eNB ID # 30 of the candidate radio base station HeNB # 3 is not managed, the handover destination candidate radio is transmitted without transmitting the HO Failure message (handover failure signal) to the handover source radio base station eNB # 0. There may be a step of transmitting a HO Request message (second handover request signal) including identification information TAI # B of the handover destination candidate tracking area included in the HO Required message to the base station HeNB # 3. .

  The second feature of the present embodiment is a mobile communication method, in which the radio base station HeNB # 2 sets up an S1 connection with the gateway device HeNB-GW, or the radio base station HeNB # 2 Step A for notifying the gateway device HeNB-GW of the identification information eNB ID # 20 of the radio base station HeNB # 2 and the tracking area identification information TAI # B to the gateway device HeNB-GW, and the gateway device HeNB- Step B in which the GW manages the received identification information eNB ID # 20 of the radio base station HeNB # 2 and the tracking area identification information TAI # B, and the gateway device HeNB-GW , Through the gateway device HeNB-GW identification information eNB ID # 100 and tracking area identification information TAI # B. In the process A, the switching center MME has a process D in which the received identification information eNB ID # 100 of the gateway device HeNB-GW and the tracking area identification information TAI # B are associated and managed. When operating in the Open mode, the radio base station HeNB # 2 notifies the switching center MME of the identification information eNB ID # 20 of the radio base station HeNB # 2 having a 20-bit length. When the radio base station station HeNB # 2 is operating in the Closed / Hybrid mode, the radio base station station HeNB # 2 notifies the exchange MME of the identification information eNB ID # 20 of the radio base station HeNB # 2 having a 28-bit length. This is the gist.

  In the second feature of the present embodiment, the switching center MME receives the identification information eNB ID of the 20-bit-long handover destination candidate radio base station HeNB # 2 included in the HO Required message received from the handover source radio base station eNB # 0. If # 20 is not managed, the handover destination candidate gateway apparatus HeNB- managing the handover destination candidate radio base station HeNB # 2 without transmitting the HO Failure message to the handover source radio base station eNB # 0 The HO Request message including the handover destination candidate tracking area identification information TAI # B included in the HO Required message is transmitted to the GW, and the handover destination candidate gateway apparatus HeNB-GW receives the received HO Req. The handover destination candidate radio base station HeNB specified by the identification information eNB ID # 20 of the handover destination candidate radio base station HeNB # 2 associated with the identification information TAI # B of the handover destination candidate tracking area included in the est message A process of transmitting a HO Request message (third handover request signal) including identification information eNB ID # 20 of handover destination candidate radio base station HeNB # 2 and identification information TAI # B of handover destination candidate tracking area to # 2. You may have.

  In the first and second features of the present embodiment, the mobile station UE is based on the broadcast information SIB1 received from the handover destination candidate radio base stations HeNB # 2 / HeNB # 3, and the handover destination candidate radio base station HeNB # 2 When the mobile station UE determines that the handover destination candidate radio base station HeNB # 2 / HeNB # 3 is operating in the Closed / Hybrid mode, the step of determining the access mode in which / HeNB # 3 is operating, Transmitting a measurement report (measurement report) including a determination result (Preliminary Access Check bit) as to whether or not the mobile station UE is allowed to access the handover destination candidate radio base stations HeNB # 2 / HeNB # 3; The mobile station UE receives the handover destination candidate radio base station H When it is determined that the eNB # 2 / HeNB # 3 is operating in the Open mode, the eNB # 2 / HeNB # 3 may include a step of transmitting a Measurement Report that does not include the Preliminary Access Check bit.

  In the first and second features of this embodiment, when the handover source radio base station eNB # 0 receives the Measurement Report that does not include the Preliminary Access Check bit, the handover destination having a 20-bit length is sent to the switching center MME. You may have the process of transmitting the HO Required message containing identification information eNB ID # 20 / # 30 of candidate radio base station HeNB # 2 / HeNB # 3.

  The third feature of the present embodiment is the radio base station HeNB, and when the S1 connection with the exchange MME is set, or when the configuration of the radio base station HeNB is changed, the exchange MME The notification unit 14 is configured to notify the identification information eNB ID of the radio base station HeNB and the identification information TAI of the tracking area, and the notification unit 14 is configured so that the radio base station HeNB is in the Open mode. When operating, the switching center MME is configured to notify the identification information eNB ID of the radio base station HeNB having a length of 20 bits, and the notification unit 14 is configured so that the radio base station HeNB is closed. When operating in the / Hybrid mode, the switching center MME is notified of the identification information eNB ID of the 28-bit long radio base station HeNB. The gist is that it is configured.

  The fourth feature of the present embodiment is the radio base station HeNB, which is used when setting the S1 connection with the gateway device HeNB-GW or when changing the configuration of the radio base station HeNB. A notification unit 14 configured to notify the device HeNB-GW of the identification information eNB ID of the radio base station HeNB and the identification information TAI of the tracking area is provided. When operating in the Open mode, the switching center MME is configured to notify the identification information eNB ID of the radio base station HeNB having a 20-bit length, and the notification unit 14 When the HeNB is operating in the Closed / Hybrid mode, the identification of the radio base station HeNB having a 28-bit length is given to the exchange MME. The gist is that it is configured to notify the different information eNB ID.

  The fifth feature of the present embodiment is an exchange MME, which is configured to manage the radio base station eNB / HeNB identification information eNB ID and tracking area identification information TAI in association with each other. And the identification information eNB ID of the 20-bit length handover destination candidate radio base stations T-eNB / T-HeNB included in the HO Required message related to the mobile station UE received from the handover source radio base station S-eNB If there is not, the handover destination candidate radio base station T-eNB / T-HeNB or the handover destination candidate radio base station T-eNB / T-HeNB without transmitting the HO Failure message to the handover source radio base station S-eNB HO Required message for gateway device HeNB-GW managing And gist to a transmission unit 23 configured to transmit an HO Request message containing the identification information TAI of the contained handover destination candidate tracking area.

  A sixth feature of the present embodiment is a mobile station UE, which is an access mode in which the handover destination candidate radio base station T-HeNB is operating based on broadcast information received from the handover destination candidate radio base station T-HeNB. Configured to transmit the Measurement Report including the identification information eNB ID of the handover destination candidate radio base station T-HeNB to the determination source 43 and the handover source radio base station S-eNB. Measurement report transmission unit 44, and when it is determined that the handover destination candidate radio base station T-HeNB is operating in the Closed / Hybrid mode, the measurement report transmission unit 44 transmits the Preliminary Access Check bit. Configure to include a Measurement Report containing The measurement report transmission unit 44 is configured to transmit a Measurement Report that does not include the Preliminary Access Check bit when it is determined that the handover destination candidate radio base station T-HeNB is operating in the Open mode. It is a summary.

  The seventh feature of the present embodiment is the radio base station eNB / HeNB, and when receiving a Measurement Report that does not include the Preliminary Access Check bit from the mobile station UE, the switching station MME has a 20-bit length. The gist is to include a handover processing unit 15 configured to transmit a HO Required message including the identification information eNB ID of the handover destination candidate radio base station T-HeNB.

  Note that the operations of the mobile station UE, the radio base station HeNB, the gateway device HeNB-GW, and the exchange MME described above may be implemented by hardware or may be implemented by a software module executed by a processor. , Or a combination of both.

  The software module includes a RAM (Random Access Memory), a flash memory, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electronically Erasable and Programmable ROM, a Hard Disk, a Registered ROM, a Hard Disk Alternatively, it may be provided in a storage medium of an arbitrary format such as a CD-ROM.

  Such a storage medium is connected to the processor so that the processor can read and write information from and to the storage medium. Further, such a storage medium may be integrated in the processor. Such a storage medium and processor may be provided in the ASIC. Such an ASIC may be provided in the mobile station UE, the radio base station HeNB, the gateway device HeNB-GW, or the exchange MME. Further, the storage medium and the processor may be provided as a discrete component in the mobile station UE, the radio base station HeNB, the gateway device HeNB-GW, or the exchange MME.

  Although the present invention has been described in detail using the above-described embodiments, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

HeNB ... wireless base station 11 ... management unit 12 ... access mode setting unit 13 ... broadcast information transmission unit 14 ... notification unit 15 ... handover processing unit MME ... exchange 21 ... management unit 22 ... reception unit 23 ... transmission unit HeNB-GW ... Gateway device 31 ... management unit 32 ... receiving unit 33 ... transmitting unit UE ... mobile station 41 ... measurement unit 42 ... notification information receiving unit 43 ... determination unit 44 ... measurement report transmitting unit

Claims (11)

  1. When the radio base station sets up a connection with the exchange or when the configuration of the radio base station is changed, the radio base station identification information and the tracking area Step A for notifying identification information;
    The exchange B has a process B for managing the received identification information of the radio base station and the identification information of the tracking area in association with each other,
    In the step A, when the radio base station is operating in a first access mode that allows access to all mobile stations, the radio base station has a first predetermined length of the radio base station. The station identification information,
    In the step A, when the radio base station is operating in an access mode other than the first access mode, the radio base station notifies the exchange with identification information of the radio base station having a second predetermined length. And a mobile communication method.
  2.   When the switching station does not manage the identification information of the handover destination candidate radio base station having the first predetermined length included in the first handover request signal related to the mobile station received from the handover source radio base station, the handover source A second handover including identification information of a handover destination candidate tracking area included in the first handover request signal for the handover destination candidate radio base station without transmitting a handover failure signal to the radio base station The mobile communication method according to claim 1, further comprising a step of transmitting a request signal.
  3. When the radio base station establishes a connection with the gateway device or changes the configuration of the radio base station, the radio base station identification information and tracking area Step A for notifying identification information;
    The gateway device associates and manages the received identification information of the radio base station and the identification information of the tracking area;
    Step C in which the gateway device notifies the switching center of the identification information of the gateway device and the identification information of the tracking area;
    The exchange has a step D for managing the received identification information of the gateway device and the identification information of the tracking area in association with each other.
    In the step A, when the radio base station is operating in a first access mode that allows access to all mobile stations, the radio base station has a first predetermined length of the radio base station. The station identification information,
    In the step A, when the radio base station is operating in an access mode other than the first access mode, the radio base station notifies the exchange with identification information of the radio base station having a second predetermined length. And a mobile communication method.
  4. When the exchange does not manage the identification information of the handover destination candidate radio base station of the first predetermined length included in the first handover request signal received from the handover source radio base station, The handover destination candidate tracking area included in the first handover request signal is identified with respect to the handover destination candidate gateway device that manages the handover destination candidate radio base station without transmitting a handover failure signal. Transmitting a second handover request signal including information;
    The handover destination candidate gateway device is specified by the identification information of the handover destination candidate radio base station associated with the identification information of the handover destination candidate tracking area included in the received second handover request signal. Transmitting a third handover request signal including identification information of the handover destination candidate radio base station and identification information of the handover destination candidate tracking area to the handover destination candidate radio base station. Item 4. The mobile communication method according to Item 3.
  5. The mobile station determining an access mode of the handover destination candidate radio base station based on broadcast information received from the handover destination candidate radio base station;
    If the mobile station determines that the handover destination candidate radio base station is not operating in the first access mode, whether or not the mobile station is permitted to access the handover destination candidate radio base station Transmitting a measurement report including the determination result of
    And a step of transmitting a measurement report not including the determination result when the mobile station determines that the handover destination candidate radio base station is operating in the first access mode. 5. The mobile communication method according to 2 or 4.
  6.   When the handover source radio base station receives a measurement report that does not include the determination result, a first handover request including identification information of the handover destination candidate radio base station having the first predetermined length is sent to the exchange. The mobile communication method according to claim 5, further comprising a step of transmitting a signal.
  7. A wireless base station,
    When setting up a connection with an exchange, or when changing the configuration of the radio base station, the radio base station identification information and tracking area identification information are notified to the exchange. Comprising a notification unit configured as follows:
    When the radio base station is operating in a first access mode that allows access to all mobile stations, the notification unit sends the radio base station having a first predetermined length to the exchange. It is configured to notify the station identification information,
    When the radio base station is operating in an access mode other than the first access mode, the notification unit notifies the exchange with identification information of the radio base station having a second predetermined length. A radio base station characterized by being configured to do so.
  8. A wireless base station,
    When setting up a connection with a gateway device or when changing the configuration of the radio base station, the radio base station identification information and tracking area identification information are notified to the gateway device. Comprising a notification unit configured as follows:
    When the radio base station is operating in a first access mode that allows access to all mobile stations, the notification unit sends the radio base station having a first predetermined length to the exchange. It is configured to notify the station identification information,
    When the radio base station is operating in an access mode other than the first access mode, the notification unit notifies the exchange with identification information of the radio base station having a second predetermined length. A radio base station characterized by being configured to do so.
  9. A management unit configured to associate and manage identification information of a radio base station and identification information of a tracking area;
    When the identification information of the handover destination candidate radio base station having the first predetermined length included in the first handover request signal related to the mobile station received from the handover source radio base station is not managed, the handover source radio base station The handover destination candidate tracking area included in the first handover request signal for the handover destination candidate radio base station or the gateway device that manages the handover destination candidate radio base station without transmitting a handover failure signal And a transmitter configured to transmit a second handover request signal including the identification information.
  10. A mobile station,
    A determination unit configured to determine an access mode of the handover destination candidate radio base station based on broadcast information received from the handover destination candidate radio base station;
    A measurement report transmission unit configured to transmit a measurement report including identification information of the handover destination candidate radio base station to a handover source radio base station;
    If the measurement report transmission unit determines that the handover destination candidate radio base station is not operating in the first access mode that allows access to all mobile stations, the handover destination candidate radio base station of the mobile station Configured to transmit a measurement report including a determination result as to whether or not access to the base station is permitted;
    The measurement report transmitting unit is configured to transmit a measurement report that does not include the determination result when the handover destination candidate radio base station determines that it is operating in the first access mode. A featured mobile station.
  11. A wireless base station,
    When receiving a measurement report from the mobile station that does not include a determination result as to whether or not access to the handover destination candidate radio base station of the mobile station is permitted, the handover of the first predetermined length A radio base station, comprising: a transmission unit configured to transmit a first handover request signal including identification information of a destination candidate radio base station.
JP2009252477A 2009-11-02 2009-11-02 Mobile communication method, radio base station, switching station, mobile station Expired - Fee Related JP5108856B2 (en)

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CN102833814B (en) * 2011-06-16 2015-12-09 华为终端有限公司 Policy control method, policing rule decision device and policy control equipment
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JP2013009028A (en) * 2011-06-22 2013-01-10 Panasonic Corp Wireless communication system
US8699461B2 (en) * 2011-08-19 2014-04-15 Hitachi, Ltd. Optimized home evolved NodeB (eNB) handover in an LTE network
JP6003990B2 (en) * 2012-08-17 2016-10-05 日本電気株式会社 Wireless base station
WO2014155513A1 (en) * 2013-03-26 2014-10-02 富士通株式会社 Relay station, control method, control program, and communication system
CN105578536B (en) * 2014-10-10 2019-08-09 中兴通讯股份有限公司 Switching method, system and a kind of micro- station gateway of the macro micro- ad-hoc network of LTE
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