WO2012020653A1

WO2012020653A1 - Control node apparatus, mobile-unit communication system, program, and method of transmitting call signal

Info

Publication number: WO2012020653A1
Application number: PCT/JP2011/067378
Authority: WO
Inventors: 和子柴田
Original assignee: 日本電気株式会社
Priority date: 2010-08-10
Filing date: 2011-07-22
Publication date: 2012-02-16

Abstract

Provided is a mobile-unit communication system, wherein calling-destination candidate cells, composed of a plurality of cells having a predetermined relationship with the current cell of a UE, are obtained on the basis of position relationship between the current cell of the UE and the base station, on the occasion of a predetermined communication to be conducted between one of a plurality of base stations and the UE. The calling-destination candidate cells and the UE are stored in a storage apparatus in association. Upon receiving a call signal destined for the UE, the mobile-unit communication system instructs the base stations of the calling-destination candidate cells associated with the UE, which are stored in the storage apparatus, to transmit call signals.

Description

Control node device, mobile communication system, program, and calling signal transmission method

The present invention relates to a call signal for a terminal in a mobile communication system, and more particularly, to a reduction in network load due to call signal traffic.

Generally, in a mobile communication system, a call signal is transmitted in order to call a mobile terminal (User Equipment, UE). The transmission path of the call signal from the core network (Core Network, CN) to the UE includes, for example, (1) CN to HNB-GW (Home Node B-Gateway) and HNB (Home Node B) to the UE. (2) Route from CN to UE via HeNB-GW (Home eNode B-Gateway), HeNB (Home eNode B), (3) CN to RNC (Radio Network Controller), Node B (4) a route from the CN to the UE via the MME (Mobility Management Entity), eNB (evolved Node B), and the like.
Here, base stations such as HNB, HeNB, Node B, and eNB are generically referred to as base stations, and HNB-GW, HeNB-GW, RNC, MME connected upstream of these base stations in the network. Are collectively referred to as a control node device, a call signal from the CN can reach the UE via the control node device and the base station.
The conventional control node device transmits a call signal from all of the subordinate base stations. For this reason, as the number of subordinate base stations increases, the traffic resulting from the transmission of the call signal also increases, and the processing load on the control node device increases. In the near future, it is expected that ultra-small base stations that accommodate only a specific small number of users, such as HNB, HeNB, etc., are expected to spread. Therefore, in conventional control node devices, an increase in processing load due to transmission of call signals is expected. Is done.
Assume that the situation is as shown in FIG. 100 HNBs # 1 to # 100 are connected to the HNB-GW 110 which is a conventional control node device. These 100 HNB location registration areas are all registered in the HNB-GW as LA # 01. UE 120 is located in LA # 01. Under such circumstances, when a call signal for the location registration area LA # 01 is received from the CN, the HNB-GW 110 transmits the call signal to all 100 HNBs. Thus, every time a call signal is transmitted to the UE, a large load is generated on the HNB-GW 100.
An example of a technique for reducing the network load due to transmission of such a call signal is described in Patent Document 1. According to this document, when performing a location registration operation, the terminal creates a list of base stations that can be awaited and transmits the list to the exchange via the base station. When transmitting a call signal to the terminal, the exchange transmits the call signal to the terminal via the base stations in the list, and when there is no response, the exchange transmits the call signal via all the subordinate base stations. Since the terminal is likely to be in the cell of the base station in the list, the terminal is likely to respond to the paging signal to be transmitted first. If there is a response at this stage, it is possible to avoid sending a call signal to all base stations having a high processing load on the exchange.
According to the technology described in Japanese Patent Application Laid-Open No. 2006-210987 (hereinafter referred to as Patent Document 1), there is a limitation on the configuration of the terminal for the purpose of creating a list of base stations that can be awaited and transmitting the list to the exchange.

The present invention has been made in view of such a situation, and the problem to be solved by the present invention is to limit the processing load generated in the control node device when transmitting a call signal to the UE, and restrict the configuration of the UE. It is to reduce without doing.

In order to solve the above-described problem, the present invention provides, as one aspect, predetermined communication performed between any of a plurality of base stations and a mobile terminal in a control node device that is controlled by a plurality of base stations. As a trigger, a means for obtaining a call target candidate cell composed of a plurality of cells having a predetermined relationship with a serving cell of the mobile terminal based on a positional relationship between the serving cell and the base station, A storage device for storing the target candidate cell and the mobile terminal in association with each other, and a base station of the call target candidate cell associated with the mobile terminal stored in the storage device in response to a call signal addressed to the mobile terminal On the other hand, there is provided a control node device comprising means for instructing transmission of a call signal.
Further, according to another aspect of the present invention, a mobile terminal is located in a region triggered by predetermined communication performed between a plurality of base stations, a mobile terminal, and any of the plurality of base stations and the mobile terminal. Means for obtaining a call target candidate cell composed of a plurality of cells having a predetermined relationship with the cell based on a positional relationship between the serving cell and the base station, and the call target candidate cell and the mobile terminal In response to a paging signal addressed to the mobile terminal and the storage device to be stored in association, the base station of the call target candidate cell associated with the mobile terminal stored in the storage device is instructed to send the paging signal There is provided a mobile communication system characterized by comprising:
In addition, the present invention provides, as another aspect, the presence of a mobile terminal in response to a predetermined communication performed between any of a plurality of base stations controlled by one control node device and the mobile terminal. A procedure for obtaining a call target candidate cell composed of a plurality of cells having a predetermined relationship with the cell based on a positional relationship between the serving cell and the base station, and the call target candidate cell and the mobile terminal A procedure of associating and storing in a storage device, and a procedure of transmitting a call signal from a base station of a call target candidate cell associated with the mobile terminal, which is stored in the storage device, in response to a call signal addressed to the mobile terminal. A program for causing a computer to execute is provided.
In addition, the present invention provides, as another aspect, the presence of a mobile terminal in response to a predetermined communication performed between any of a plurality of base stations controlled by one control node device and the mobile terminal. Determining a call target candidate cell composed of a plurality of cells having a predetermined relationship with the cell based on a positional relationship between the serving cell and the base station, and calling the candidate cell and the mobile terminal to each other A step of associating and storing in a storage device; and a step of transmitting a call signal from a base station of a call target candidate cell associated with the mobile terminal stored in the storage device in response to a call signal addressed to the mobile terminal. A calling signal transmission method is provided.

According to the present invention, when a call signal for a mobile terminal is received, the control node apparatus is not a base station of the mobile terminal but a call target candidate cell composed of cells having a predetermined relationship with a cell in which the mobile terminal is located. Since only the base station is instructed to send the call signal, the processing load on the control node device when the call signal is sent can be reduced. For this reason, it is not necessary to limit the configuration of the mobile terminal.

FIG. 1 is a diagram for explaining a configuration of a mobile communication system 1 according to an embodiment of the present invention and cells registered in a call target candidate cell database 6.
FIG. 2 is a diagram for explaining the configuration of the mobile communication system 10 according to an embodiment of the present invention and the cells registered in the call target candidate cell database 15.
FIG. 3 is a diagram for explaining an operation when registering the HNB 12 in the HNB-GW 13 in the mobile communication system 10.
FIG. 4 is a diagram for explaining the structure of data transmitted from the HNB 12 to the HNB-GW 13 when the HNB 12 is registered in the mobile communication system 10.
FIG. 5 shows an example of data registered in the call target candidate cell database 15 in the mobile communication system 10.
FIG. 6 is a flowchart showing a calling sequence when the target cell is registered in the HNB-GW call target candidate cell database and the UE exists under the call target candidate cell in the mobile communication system 10.
FIG. 7 is a flowchart showing a calling sequence when the target cell is registered in the call target candidate cell database of the HNB-GW and the UE does not exist under the call target candidate cell in the mobile communication system 10.
FIG. 8 is a flowchart showing a call sequence when the target cell is not registered in the call target candidate cell database of HNB-GW in the mobile communication system 10.
FIG. 9 is a flowchart showing an operation when the HNB-GW 13 determines a call target cell in the HNB and transmits a call signal in the mobile communication system 10.
FIG. 10 is a flowchart for explaining the S1 SETUP procedure described in 3GPP Release8 TS36.413 §8.7.
FIG. 11 is a diagram for explaining a message transmitted from the HeNB to the HeNB-GW in the third embodiment.
FIG. 12 is a diagram for explaining the configuration of a mobile communication system according to the fourth embodiment of the present invention.
FIG. 13 is a diagram for explaining the processing load when the HNB-GW 110, which is a conventional control node device, transmits a call signal.

A mobile communication system 1 according to a first embodiment of the present invention will be described with reference to FIG. The mobile communication system 1 includes a mobile terminal (hereinafter referred to as UE) 2, a base station 3, a control node device 4, and a core network (hereinafter referred to as CN) 5, and the control node device 4 includes a call target candidate cell database. 6 is provided.
The mobile communication system 1 is, for example, an IMT-2000 mobile communication system. As an example of a combination of the base station 3 and the control node device 4, in the U-TRAN (UMTS Terrestrial Radio Access Network) system,
(1) Base station controller (Radio Network Controller, RNC) and base station (NodeB)
(2) HNB-GW (Home NodeB-Gateway) and HNB (Home NodeB)
There is. In E-UTRAN (evolved UMTS Terrestrial Radio Access Network) system,
(3) MME (Mobility Management Entity) and eNB (E-UTRAN NodeB)
(4) HeNB-GW (Home E-UTRAN NodeB-Gateway) and HeNB (Home E-UTRAN NodeB)
There is.
In the call target candidate cell database 6, information that can identify each mobile terminal 2, identification information of a cell in which the mobile terminal 2 is located, and identification of each of a plurality of cells determined based on the located cell Stored in association with information. Hereinafter, the entire serving cell and a plurality of cells determined based on the serving cell are referred to as call target candidate cells. As an example of the call target candidate cell, a cell group including a cell in the service area and a cell adjacent to the service cell can be considered. In FIG. 1, since the serving cell of UE2 is the cell of base station # 3 and the adjacent cells are cells of base stations # 2 and # 4, the call target candidate cell database 6 includes the identification information of UE2, base station # The identification information of 2, # 3, and # 4 is stored in association with each other.
As a trigger for updating the call target candidate cell database 6, a predetermined operation including wireless communication between the mobile terminal 2 and the base station 3 is used. Examples of the trigger operation include handover (Hand Over, HO), outgoing call, incoming call, location registration, and cell reselection. In response to the execution of the trigger operation, the base station 3 or the control node device 4 acquires the identification information of the mobile terminal 2 and the identification information of the serving cell, and the control node device 4 updates the call target candidate cell database 6. .
The control node device holds in advance information related to the adjacent relationship between subordinate base stations, that is, adjacent cell information. For example, the RNC generally holds information defined in 3GPP TS25.433 9.2.1.47C “Neighboring FDD Cell Measurement Information”, and uses this as neighboring cell information. In general, when a base station is connected for the first time under control of a control node device between HNB-GW and HNB, MME and eNB, or HeNB-GW and HeNB, information registered in the base station is controlled from the base station. A process of transmitting to the node device and registering with the control node device is performed, and neighboring cell information is acquired from this information and held. Alternatively, the control node device may acquire the neighboring cell information simultaneously with the update of the call target candidate cell database 6.
Based on such cell adjacent relationship information, identification information of the mobile terminal 2, and identification information of the serving cell, the control node device acquires identification information of the call target candidate cell determined based on the serving cell. . As the identification information of the mobile terminal 2, for example, IMSI (International Mobile Subscriber Identity) is used. Then, the identification information of the mobile terminal 2 and the identification information of the call target candidate cell are associated with each other and stored in the call target candidate cell database 6.
In this state, when a call signal for the mobile terminal 2 is received from the CN 5, the control node device 4 searches the call target candidate cell database 6 and identifies each of the call target candidate cells corresponding to the identification information of the mobile terminal 2. Information is acquired and a call signal is transmitted only to the base station of the acquired cell. The call signal includes an identifier that can identify one of the mobile terminals 2, for example, IMSI. At this time, a call signal is not transmitted to base stations of cells other than the call target candidate cell. By transmitting the call signal only to the call target candidate cells, the processing load on the control node device 4 can be reduced compared to the case where the call signal is transmitted to all the subordinate base stations.
When there is no response from the mobile terminal 2 even after a predetermined time has passed in response to the transmission of the paging signal limited to the call target candidate cell, the control node device 4 sends the paging signal to the mobile terminal via all subordinate base stations 3. 2 to send. The processing load in the control node device 4 for transmitting the call signal to all the subordinate base stations is the same as the conventional one, but here the call target candidate cell is the cell in which the mobile terminal 2 was last located, Since the cell is adjacent to the cell, there is a high possibility that the mobile terminal 2 exists, and in many cases, the mobile terminal 2 is considered to respond by transmitting a call signal limited to the call target candidate cell. Therefore, the processing load on the control node device 4 can be reduced.
The operation of the mobile communication system 1 will be described. Information on the adjacent relationship between cells is stored in the control node device 4 or a storage device accessible from the control node device 4.
Further, when a predetermined operation including wireless communication between the UE 2 and the base station is executed, the control node device 4 acquires the identification information of the UE 2 and the identification information of the cell in which the UE 2 is located. Further, based on the adjacent relationship between the cells stored in advance in the storage device, the identification information of the cell adjacent to the serving cell is acquired, and the identification information of the UE 2, the serving cell and the identification information of the neighboring cell are associated with each other. And stored in the call target candidate cell database 6.
When the call signal for the UE 2 is received from the CN 5, the control node device 4 searches the call target candidate cell database 6, and stores the cell identification information stored in association with the identification information of the UE 2 for which the call signal is the call target. The call signal is transmitted to the base stations 3 of those cells, and only the base station 3 that has received the call signal transmits the call signal addressed to the UE 2 to be called. If the UE 2 is present in the cell of the base station 3 in a state where it can respond, the UE 2 responds to the paging signal. If there is no response to the call signal even after the predetermined time has elapsed, the control node device 4 transmits the call signal to all the base stations 3 under its control.
Next, a second embodiment of the present invention will be described. In this embodiment, a cell before handover and its neighboring cells, a cell after handover and its neighboring cells are registered as call target candidate cells in the call target candidate cell database in association with the IMSI of the UE. Handover is used as a trigger for updating the call target candidate cell database. When a call signal for a certain UE is received from the CN, the control node apparatus searches the call target candidate cell database, obtains a cell associated with the IMSI of the call target UE, and calls the call signal to the base station of those cells. Send.
A mobile communication system 10 according to the present embodiment will be described with reference to FIG. The mobile communication system 10 is a UE 11, a base station HNB (Home Node B) 12, a control node device, and a HNB-GW (HNB-Gateway) 13 that bundles a plurality of HNBs to communicate with the mobile switching center. The mobile switching network (Core Network: CN) 14 that performs the switching operation of the mobile switching network, and the call target candidate cell database 15 in the HNB-GW.
(1) Registration of neighboring cell information in the call target candidate cell database
As described above, it is necessary to register neighboring cell information in the call target candidate cell database 15. For this reason, in using HNB12, the procedure as prescribed in 3GPP Release8 TS25.469 §8.2 is performed. This procedure will be described with reference to FIG.
First, the HNB 12 transmits an HNBAP: HNB REGISTER REQUEST message to the HNB-GW 13 at the time of startup or the like. In 9.1.3 of 3GPP TS25.469, a message consisting of Message Type to CSG-ID in the table of FIG. 4 is to be transmitted, but in addition to this, the PSC (Primary Scrambling Code of HNB12) ) And the Cell-ID, UL UARFCN, DL UARFCN, and PSC of the adjacent cell of the HNB 12 are transmitted to the HNB-GW 13. The information related to the adjacent cell of the HNB 12 is transmitted for all the cells adjacent to the HNB 12. The HNB-GW 13 registers these neighboring cells of the HNB 12 as call target candidate cells in the call target candidate cell database 15.
Next, HNB-GW13 transmits HNBAP: HNB REGISTERATION ACCEPT to HNB12, and complete | finishes a HNB Registration procedure. Note that the HNBAP: HNB REGISTERATION ACCEPT message is the same as the conventional one.
(2) Registration of call target candidate cell database
After handover (HO) from one HNB 12 to another HNB 12, the HNB-GW 13 determines the UE 11's IMSI, the Source HNB and the Target HNB, the PSC of their neighboring cells, and location registration area information (eg, LA, RA , TA), an identifier (for example, Cell ID, HNB ID, or RNC ID) that can identify the cell of the HNB is registered in the call target candidate cell database.
Specifically, in FIG. 2, when the UE 11 performs HO from the HNB # 3 to the HNB # 4, the HNB-GW 13 stores the IMSI of the UE 11 and the base of the cell before HO in the call target candidate cell database 15 after the completion of the HO. Base stations HNB # 3 and HNB # 3 of the cells adjacent to the cells of the stations HNB # 3 and HNB # 3, base stations HNB # 4 and HNB # 4 of the cells adjacent to the cells of the cells HNB # 4 and HNB # 4 after the HO 5. Register the HNB # 6 PSC, location registration area information, and an identifier that identifies the HNB cell.
FIG. 5 shows an example of neighboring cell information registered in the call target candidate database 15 at this time. In this example, LA (Location Area) is given as an example of the location registration area, but RA (Routing Area) and TA (Tracking Area) may be used as this location registration area. Moreover, although HNB ID is raised as an identifier which can identify the cell of HNB12, as identifier which can identify the cell of HNB, what combined Cell ID, RNC ID, PSC, and DL UARFCN, Global eNB ID, C-ID A combination of PCI and EARFCN may be used.
(3) Transmission of call signal
The process performed when the CN 14 calls the UE 11 differs depending on whether or not the call target cell has been registered in the call target candidate cell database 15 and whether or not the UE 11 exists under the call target cell.
First, a process when the call target cell has been registered in the call target candidate cell database 15 and the UE 11 exists under the call target cell will be described with reference to FIG.
The CN transmits a call signal for the UE to the HNB-GW (step S1).
The HNB-GW searches the call target cell in the call target candidate cell database (step S2). The process of step S2 will be described in detail later.
When the call target cell is found, the HNB-GW transmits a call signal to the call target cell and sets a call response waiting timer (step S3). If no call target cell is found here, the process proceeds to step S9 described later.
The node having the call target cell transmits a call signal to the UE (step S4).
When the call signal reaches the UE, the UE transmits a call response message to the “node having the call target cell” (step S5). If the call signal does not reach the UE, the process proceeds to step S13 described later.
The node having the call target cell transmits a call response signal to the HNB-GW (step S6).
The HNB-GW stops the call response waiting timer and transmits a call response signal to the CN (step S7).
Call establishment processing is performed according to existing processing (step S8).
Next, processing when the call target cell has been registered in the call target candidate cell database 15 and the UE 11 does not exist under the call target cell will be described with reference to FIG. In the figure, steps S1 to S4, S7, and S8 are not described because they are described.
Since UE11 does not exist under the call target cell, there is no response from the UE, and the call response waiting timer expires in the HNB-GW (step S9).
The HNB-GW transmits a call signal to all nodes registered in the location registration area included in the call signal, and starts a call signal response waiting timer (step S10).
The node registered in the location registration area transmits a call signal to the UE (step S11).
When the call signal arrives at the UE, the UE transmits a call response message to the node registered in the location registration area (step S12). If the call signal does not reach the UE, normal error processing is performed by the HNB-GW.
The node registered in the location registration area transmits a call response message to the HNB-GW (step S13), and proceeds to step S7.
FIG. 8 shows the process in the case where the call target cell is not registered in the call target candidate cell database 15, but the description of each step of this process is omitted because it has already been described.
Next, the process of step S2 in the above sequence, that is, the operation of the HNB-GW when the HNB-GW transmits a call signal to the HNB will be described with reference to FIG.
The HNB-GW receives a call signal from the CN (step S21).
Using the IMSI in the call signal as a key, the call target candidate cell database is searched to determine whether the same IMSI as the IMSI in the call signal is registered (step S22). If registered, the process proceeds to step S23, and if not registered, the process proceeds to step S25.
In the call target candidate cell database, the location registration area information in the row (also referred to as Row or set) where the same IMSI as the IMSI in the call signal is compared with the location registration area information in the call signal (step S23). ). If both are the same, the process proceeds to step S24, and if different, the process proceeds to step S25.
In the call target candidate cell database, a row having the same IMSI as the IMSI in the call signal is searched, and the call signal is sent to the node corresponding to the identifier that can identify the HNB cell described in the row. Transmit (step S24). For example, when the table of FIG. 5 is stored in the call target candidate cell database, the IMSI in the call signal is 123456789012345, and the location registration area in the call signal is LA = 01, the first row of the table is The HNB-GW transmits a call signal to the HNB having the HNB ID = 01 described in this line. Similarly, since the second to sixth lines also correspond, a call signal is transmitted to each HNB with HNB ID = 0 to 06.
If the IMSI in the call signal is not registered in the call target candidate cell database, or is registered but does not match the location registration area in the call signal, all the same location registration areas in the call signal A call signal is transmitted to the node (step S25).
Next, a third embodiment of the present invention will be described. The neighboring cells are registered in the call target candidate cell database by a procedure different from the second embodiment “(1) Registration of neighboring cell information in the call target candidate cell database”. In the second embodiment, the correspondence between each cell and its neighboring cells is known in advance, but in this embodiment, the neighboring cell of the cell of interest is obtained according to the update trigger of the call target candidate cell database. As an update trigger, Registration (location registration) or call, incoming call, Cell Selection in Cell_FACH state is used.
As in the second embodiment, the combination of the base station 3 and the control node device 4 in this embodiment is an HNB-GW (Home) of a U-TRAN (UMTS Terrestrial Radio Access Network) system as shown in FIG. A combination of NodeB-Gateway) and HNB (Home NodeB) is used. Alternatively, a combination of HeNB-GW (Home E-UTRAN NodeB-Gateway) and HeNB (Home E-UTRAN NodeB) in an E-UTRAN (evolved UMTS Terrestrial Radio Access Network) system is used.
When registering a base station with a control node device, that is, when registering the HNB with the HNB-GW or when registering the HeNB with the HeNB-GW, the base station notifies the control node device of the location information of the base station. To do. In this embodiment, the location information of this base station is stored in the storage device of the control node device.
When UE performs registration (location registration) or call / incoming, Cell Reselection in Cell_FACH state, neighboring cell information of cell where UE is located is determined based on location information of H (e) NB Then, the information on the in-zone cell and its neighboring cells is registered in the call target candidate cell database.
When the UE call signal is received from the CN, the call signal is transmitted to the cell registered in the database with reference to the database for each IMSI of the UE. Details will be described below.
An operation when the base station reports position information to the control node device will be described. In the combination of HNB and HNB-GW, the procedure of HNB Registration (see 3GPP Release8 TS25.469 §8.2) as shown in FIG. 3 is performed when using HNB.
1. The HNB transmits an HNB REGISTER REQUEST message of HNBAP (HNB Application Part) to the HNB-GW at the time of startup or the like. This message includes HNB Location Information, as shown in FIG. The HNB Location Information is information for notifying the HNB location of information related to the location of the HNB from the HNB to the HNB-GW, and specifically includes the latitude, longitude, altitude of the HNB, IP address information of the HNB, and the like. When this message is received, the HNB-GW stores the HNB Location Information included in the message in an internal database in association with an identifier indicating the HNB.
2. The HNB-GW transmits an HNB REGISTER ACCEPT message of the HNBAP to the HNB and ends the HNB Registration procedure. Note that the message content of HNBAP: HNB REGISTERATION ACCEPT is the same as the conventional one.
The operation when the base station reports position information to the control node device in the combination of HeNB and HeNB-GW is as follows. In using the eNB or HeNB, first, an S1 SETUP procedure (see 3GPP Release8 TS36.413 §8.7) as shown in FIG. 10 is performed.
1. The HeNB transmits an S1 SETUP REQUEST message of S1AP (S1 Application Protocol) to the HeNB-GW when starting up. In this message, as shown in FIG. 11, HeNB Location Information is added. The content of HeNB Location Information is equivalent to HNB Location Information in 3GPP TS25.469 9.2.3. When receiving the message, the HeNB-GW holds the HeNB Location Information included in the message in an internal database in association with an identifier indicating the HeNB.
2. The HeNB-GW transmits S1AP: S1 SETUP RESPONSE to the HeNB and ends the S1 SETUP procedure. Note that the message content of S1AP: S1 SETUP RESPONSE is the same as the conventional one.
Although it has been described that HNBAP and S1AP are used as a protocol for message transmission when the base station reports position information to the control node device, the protocol is not limited to these, and other protocols such as RANAP ( Radio Access Network Application Part (RUA), RUA (RANAP User Adaptation), and SIP (Session Initiation Protocol) may be used.
In this way, the base station reports the respective position information to the control node device. In response to this report, the control node device associates the identifier of each base station with its location information and holds it in the internal database.
Under such circumstances, when the UE performs an update trigger operation such as registration (location registration) or call / incoming, Cell Selection in Cell_FACH state, the control node device (HNB-GW or HeNB-GW) Referring to location information (HNB Location Information, etc.) of other cells held in the database, the cell in which the UE is located, that is, registration (location registration), outgoing call, incoming call, Cell in Cell_FACH state A cell adjacent to the cell used by the UE when performing Reselection is obtained. In the first and second embodiments, it is necessary to know the adjacent relationship between cells in advance, but in this embodiment, the cell adjacent to the cell used by the UE is obtained at this stage. It is not necessary to know the adjacency relationship in advance.
Based on the adjacent cells obtained in this way, the control node device registers or updates the call target candidate cell database. More specifically, the control node device registers or updates the following items registered in the call target candidate cell database.
-UE IMSI
・ Source HNB and its neighboring cell PSC
-Target HNB and its neighboring cell PSC
Location registration area information, such as LA (Location Area), RA (Routing Area), TA (Tracking Area)
-An identifier that can identify the cell of the HNB, such as Cell ID, HNB ID, RNC ID
Next, a fourth embodiment of the present invention will be described. The mobile communication system of the present embodiment is a system that uses an HNB-GW (Home NodeB-Gateway) and an HNB (Home NodeB) of a U-TRAN system as a combination of a base station and a control node device. 12, a user equipment (UE) 200, an HNB (Home Node B) 210, an HNB-GW 220 that bundles a plurality of HNBs to communicate with the mobile switching center, and performs a switching operation of the mobile switching network. It consists of a mobile switching center (CN) 230, an automatic configuration server (ACS) 240, and a network management system (NMS) 250. The HNB 210 includes a GPS receiver.
The following communication is performed between the HNB 210 and the ACS 240 using a protocol CWMP (CPE WAN Management Protocol) (also known as TR-069) defined by the DSL Forum.
(1) The location information (information measured by GPS, such as latitude and longitude) of the HNB 210 is notified from the HNB 210 to the ACS 240 together with the identification information of the HNB 210. At that time, the notification is made using CWMP Inform Request or Upload.
(2) The ACS 240 compares the notified identification information and location information of the HNB 210 with the identification information and location information of another HNB that has already been acquired, and the ACS 240 determines a cell adjacent to the HNB 210 automatically or manually. , It is registered in the storage device of the ACS 240 as neighbor cell list information, and the neighbor cell list information is notified to the NMS 250.
(3) The NMS 250 notifies the HNB-GW 220 of the neighboring cell list of the HNB 210.
(4) When the HNB-GW 220 receives the UE call signal from the CN 250, the HNB-GW 220 refers to the database for each IMSI of the UE 200 and transmits the call signal to the cell registered in the database.
In this embodiment, CWMP (TR-069) is used as a protocol, but another RPC Method other than TR-069 or a protocol other than TR-069 may be used.
As mentioned above, although this invention was demonstrated according to embodiment, these embodiment is an illustration and this invention is not limited to these.
For example, in the above description, a cell that is likely to have a user in a specific time zone can be obtained based on the life log that is history information of the user's lifestyle (time, place, etc.) in the call target candidate cell database. By further narrowing down as call target candidate cells, further optimization of call signal transmission may be performed.
In the mobile communication system 10 according to the second embodiment, the control node device is described as HNB-GW and the base station is described as HNB. However, the present invention is not limited to this. For example, the control node device may be an RNC and the base station may be a Node B. In this case, since the RNC holds information defined in 3GPP TS25.433 9.2.1.47C “Neighboring FDD Cell Measurement Information”, it can be considered to use this as neighboring cell information.
Alternatively, the control node device may be MME and the base station may be eNB, or the control node device may be HeNB-GW and the base station may be HeNB. In these cases, when using eNB or HeNB, first, the S1 SETUP procedure (see 3GPP Release8 TS36.413 §8.7) as shown in FIG. 10 is performed.
1. The eNB or HeNB transmits an S1AP: S1 SETUP REQUEST message to the MME or HeNB-GW at the time of activation or the like. In this message, as shown in FIG. 11, PCI (Physical Cell Identifier) of eNB or HeNB, ECGI (E-UTRAN Cell Global Identifier) of neighboring cell of eNB or HeNB, PCI, EARFCN (DL EARFCN for FDD and EARFCN ) Is added. All the information of this adjacent cell is put for the number of adjacent cells. When the MME or HeNB-GW receives the message, it holds the information in the internal database.
2. The MME or HeNB-GW transmits S1AP: S1 SETUP RESPONSE to the eNB or HeNB and ends the S1 SETUP procedure (the S1AP: S1 SETUP RESPONSE message is not changed).
In this message, HNBAP and S1AP are used, but other protocols such as RUA, RANAP, and SIP may be used.
In the above embodiment, the RNC or HNB-GW is used as the control node device in the U-TRAN system. However, the present invention is not limited to this, and the MSC (higher order node) ( Mobile Switching Center may be used as the control node device. In this case, the call target candidate cell database is provided in the MSC.
In the above description, the control node device creates neighboring cell information based on information acquired from the base station, but the present invention is not limited to this, and information acquired from the UE, for example, the UE is GPS (Global (Positioning System) receiver, based on the GPS location information acquired from the UE, the control node device determines the UE's serving cell and neighboring cells, and registers the determined cell in the call target candidate cell database Also good.
In the above description, the serving cell and the neighboring cell are designated as call target candidate cells, the serving cell and its neighboring cell before handover, and the serving cell and its neighboring cell after handover as call target candidate cells. However, the configuration of the call target candidate cell is not limited to these. For example, in addition to the serving cell and its neighboring cells, a cell further adjacent to the neighboring cell may be used as the call target candidate cell. Alternatively, in addition to the serving cell before and after the handover and its neighboring cells, the serving cell and its neighboring cell before the previous handover may be set as the call target candidate cells.
Part or all of the above embodiments and examples can be described as the following supplementary notes, but are not limited thereto.
(Appendix 1)
In a control node device that controls a plurality of base stations,
A call target candidate consisting of a plurality of cells having a predetermined relationship with a serving cell of the mobile terminal triggered by a predetermined communication performed between any of the plurality of base stations and the mobile terminal Means for determining a cell based on a positional relationship between the serving cell and the base station;
A storage device for storing the call target candidate cell and the mobile terminal in association with each other;
Means for instructing transmission of the call signal to the base station of the call target candidate cell associated with the mobile terminal, stored in the storage device, in response to the call signal addressed to the mobile terminal;
A control node device comprising:
(Appendix 2)
The control node apparatus according to appendix 1, wherein the call target candidate cell includes a cell adjacent to the in-zone cell.
(Appendix 3)
3. The control node device according to appendix 2, wherein the call target candidate cell further includes a cell that was located immediately before the visited cell.
(Appendix 4)
The control node apparatus according to appendix 3, wherein the call target candidate cell further includes a cell adjacent to a cell that was located immediately before the visited cell.
(Appendix 5)
The control node device according to appendix 1, wherein the trigger is any one of handover, location registration, outgoing call, incoming call, and cell reselection.
(Appendix 6)
The control node apparatus according to appendix 1, wherein the positional relationship is based on information indicating a base station of a cell adjacent to a cell of the base station, which is stored in advance in a storage device of the base station.
(Appendix 7)
The control node device according to appendix 1, wherein the positional relationship is based on location information of the base station stored in advance in a storage device of the base station or measured by positioning means provided in the base station .
(Appendix 8)
Multiple base stations,
A mobile terminal,
A call target consisting of a plurality of cells having a predetermined relationship with a serving cell of the mobile terminal triggered by a predetermined communication performed between any of the plurality of base stations and the mobile terminal Means for obtaining a candidate cell based on a positional relationship between the serving cell and the base station;
A storage device for storing the call target candidate cell and the mobile terminal in association with each other;
Means for instructing transmission of the call signal to the base station of the call target candidate cell associated with the mobile terminal, stored in the storage device, in response to the call signal addressed to the mobile terminal;
A mobile communication system comprising:
(Appendix 9)
The mobile communication system according to appendix 8, wherein the call target candidate cell includes a cell adjacent to the in-zone cell.
(Appendix 10)
The mobile communication system according to appendix 9, wherein the call target candidate cell further includes a cell that was located immediately before the visited cell.
(Appendix 11)
11. The mobile communication system according to appendix 10, wherein the call target candidate cell further includes a cell adjacent to a cell located immediately before the visited cell.
(Appendix 12)
9. The mobile communication system according to appendix 8, wherein the trigger is any one of handover, location registration, outgoing call, incoming call, and cell reselection.
(Appendix 13)
9. The mobile communication system according to appendix 8, wherein the positional relationship is based on information indicating a base station of a cell adjacent to the cell of the base station, which is stored in advance in a storage device of the base station.
(Appendix 14)
The mobile communication according to appendix 8, wherein the positional relationship is based on positional information of the base station stored in advance in a storage device of the base station or measured by positioning means provided in the base station. system.
(Appendix 15)
With a predetermined communication performed between one of a plurality of base stations controlled by one control node device and a mobile terminal as a trigger, a predetermined relationship is established between the mobile terminal and the serving cell. Obtaining a call target candidate cell comprising a plurality of cells based on a positional relationship between the serving cell and the base station;
Storing the call target candidate cell and the mobile terminal in a storage device in association with each other;
A procedure of transmitting the call signal from the base station of the call target candidate cell associated with the mobile terminal, stored in the storage device, in response to the call signal addressed to the mobile terminal;
A program that causes a computer to execute.
(Appendix 16)
The program according to appendix 15, wherein the call target candidate cell includes a cell adjacent to the serving cell.
(Appendix 17)
17. The program according to appendix 16, wherein the call target candidate cell further includes a cell that was located immediately before the visited cell.
(Appendix 18)
The program according to appendix 17, wherein the call target candidate cell further includes a cell adjacent to a cell that was located immediately before the visited cell.
(Appendix 19)
The program according to appendix 15, wherein the trigger is any one of handover, location registration, outgoing call, incoming call, and cell reselection.
(Appendix 20)
The program according to claim 15, wherein the positional relationship is based on information indicating a base station of a cell adjacent to a cell of the base station, which is stored in advance in a storage device of the base station.
(Appendix 21)
The program according to appendix 15, wherein the positional relationship is based on positional information of the base station stored in advance in a storage device of the base station or measured by positioning means provided in the base station.
(Appendix 22)
With a predetermined communication performed between one of a plurality of base stations controlled by one control node device and a mobile terminal as a trigger, a predetermined relationship is established between the mobile terminal and the serving cell. Obtaining a call target candidate cell comprising a plurality of cells based on a positional relationship between the serving cell and the base station;
Storing the call target candidate cell and the mobile terminal in a storage device in association with each other;
Transmitting the call signal from a base station of the call target candidate cell associated with the mobile terminal, stored in the storage device, in response to the call signal addressed to the mobile terminal;
A call signal transmission method comprising:
(Appendix 23)
The call signal transmission method according to appendix 22, wherein the call target candidate cell includes a cell adjacent to the in-zone cell.
(Appendix 24)
24. The call signal transmission method according to appendix 23, wherein the call target candidate cell further includes a cell located immediately before the visited cell.
(Appendix 25)
25. The call signal transmission method according to appendix 24, wherein the call target candidate cell further includes a cell adjacent to a cell located immediately before the visited cell.
(Appendix 26)
23. The call signal transmission method according to appendix 22, wherein the trigger is any one of handover, location registration, outgoing call, incoming call, and cell reselection.
(Appendix 27)
23. The call signal transmission method according to appendix 22, wherein the positional relationship is based on information indicating a base station of a cell adjacent to a cell of the base station, which is stored in advance in a storage device of the base station.
(Appendix 28)
23. The call signal according to appendix 22, wherein the positional relationship is based on positional information of the base station stored in advance in a storage device of the base station or measured by positioning means provided in the base station. Transmission method.
This application claims the priority on the basis of Japanese application Japanese Patent Application No. 2010-179613 for which it applied on August 10, 2010, and takes in those the indications of all here.

Claims

In a control node device that controls a plurality of base stations,
A call target candidate consisting of a plurality of cells having a predetermined relationship with a serving cell of the mobile terminal triggered by a predetermined communication performed between any of the plurality of base stations and the mobile terminal Means for determining a cell based on a positional relationship between the serving cell and the base station;
A storage device for storing the call target candidate cell and the mobile terminal in association with each other;
Means for instructing transmission of the call signal to a base station of the call target candidate cell associated with the mobile terminal, stored in the storage device, in response to the call signal addressed to the mobile terminal A control node device.
The control node apparatus according to claim 1, wherein the call target candidate cell includes a cell adjacent to the in-zone cell.
The control node apparatus according to claim 2, wherein the call target candidate cell further includes a cell that has been in service immediately before the service cell.
The control node apparatus according to claim 3, wherein the call target candidate cell further includes a cell adjacent to a cell that was located immediately before the visited cell.
2. The control node apparatus according to claim 1, wherein the trigger is any one of handover, location registration, outgoing call, incoming call, and cell reselection.
The control node apparatus according to claim 1, wherein the positional relationship is based on information indicating a base station of a cell adjacent to a cell of the base station, which is stored in advance in a storage device of the base station.
2. The control node according to claim 1, wherein the positional relationship is based on positional information of the base station stored in advance in a storage device of the base station or measured by positioning means provided in the base station. apparatus.
Multiple base stations,
A mobile terminal,
A call target consisting of a plurality of cells having a predetermined relationship with a serving cell of the mobile terminal triggered by a predetermined communication performed between any of the plurality of base stations and the mobile terminal Means for obtaining a candidate cell based on a positional relationship between the serving cell and the base station;
A storage device for storing the call target candidate cell and the mobile terminal in association with each other;
Means for instructing transmission of the call signal to a base station of the call target candidate cell associated with the mobile terminal, stored in the storage device, in response to the call signal addressed to the mobile terminal A mobile communication system.
With a predetermined communication performed between one of a plurality of base stations controlled by one control node device and a mobile terminal as a trigger, a predetermined relationship is established between the mobile terminal and the serving cell. Obtaining a call target candidate cell comprising a plurality of cells based on a positional relationship between the serving cell and the base station;
Storing the call target candidate cell and the mobile terminal in a storage device in association with each other;
In order to cause a computer to execute a procedure of transmitting the call signal from the base station of the call target candidate cell associated with the mobile terminal, stored in the storage device, in response to the call signal addressed to the mobile terminal Program.
With a predetermined communication performed between one of a plurality of base stations controlled by one control node device and a mobile terminal as a trigger, a predetermined relationship is established between the mobile terminal and the serving cell. Obtaining a call target candidate cell comprising a plurality of cells based on a positional relationship between the serving cell and the base station;
Storing the call target candidate cell and the mobile terminal in a storage device in association with each other;
Transmitting the call signal from the base station of the call target candidate cell associated with the mobile terminal, stored in the storage device, in response to the call signal addressed to the mobile terminal. To send a call signal.