JP5258425B2 - Paging method and system for heterogeneous network, and terminal used for heterogeneous network - Google Patents

Description

  The present invention relates to the field of wireless communication networks, and more particularly, to a paging method and system for a heterogeneous network and a terminal used for the heterogeneous network.

  In a wireless communication network, the purpose of the location management of the host / terminal by the wireless communication system is to locate and track the location of the roaming or movable host / terminal as needed to move the call or packet to the destination. The goal is to give the system the ability to accurately deliver to the host / terminal. In the mobility protocol, location management involves two sub-processes: location update and paging. The wireless communication network is required to track and record the location information of the mobile station, and in this way, the incoming call can be delivered to the correct user on demand.

  According to the generation order of each sub-process, the first occurrence is location registration. The mobile host / terminal is required to periodically notify the access point where it is currently located, and the system will authenticate the user and confirm the identity before confirming that it is based on its current location. Update the corresponding position information data in the database. When there is an incoming packet or a packet to be transferred, the current location and network access point on the called side are searched from the database. Through the paging mechanism, the system notifies the user of a call or packet transfer request, and after the user responds, the communication to the destination mobile host / terminal can be completed.

  As the number of mobile users increases, it is required to adapt to rapidly increasing network communication traffic using more effective mechanisms. The main reference indicators of the process include security mechanism, dynamic database update, data search delay and host / terminal paging method and delay. Since location management mainly involves only database operations and signaling information transmission, it is versatile for different networks and protocols.

  Future wireless networks will consist of networks based on various wireless access technologies and standards. By using terminals that support different access technologies, users can access the network and receive satisfactory services. However, users are not satisfied with the finite service provided by a single network, receive full service and expect seamless roaming around the world, and some networks provide full service and ubiquity coverage It is not possible to satisfy various user requirements. This is determined by the characteristics of each type of technology (data transmission rate, coverage, reliability, service quality, etc.). Thus, each type of network provides its dominant service and other services are supplemented by other networks. Therefore, networks based on multiple types of access technologies work together to improve the transmission capacity of the entire network, provide better service quality, reduce network access costs, and increase the potential of various access technologies. It is required to find. When a user carries a multi-mode terminal and moves between a plurality of wireless networks such as a WAN or a LAN, the following problems that cannot be solved exist.

  1) If the terminal is operating in multi-mode at the same time, it is required to update the location in multiple networks and monitor paging messages from multiple networks, so too many location update signaling overloads It will cause head and energy consumption.

  2) When the terminal is operating in one mode at a certain time, it can reduce the overhead of location update signaling and save the terminal's finite energy, but from the network side of other inactive modes Paging messages cannot be effectively monitored, and network communication in the inactive mode cannot be established effectively.

  Therefore, there is a need for a paging method in a heterogeneous network that can effectively resolve the contradiction between monitoring and energy consumption for paging messages on the network side of dual / multi-mode terminals.

  An object of the present invention is to provide a paging method that can save energy consumption of a terminal.

  A first feature of the present invention is a method for paging a heterogeneous network including at least a first network and a second network, wherein at least an overlap coverage area of the first network and the second network has a second When there is a paging request from the network, the terminal that is the destination of the paging request is checked whether it is operating in the first network mode, and the registered location information is searched. A step for confirming that the terminal is not operating in the network mode, and if the terminal is operating in the first network mode, a paging request from the second network exists in the paging message in the first network mode. Adding heterogeneous paging instruction information indicating that the Information, and based on the paging message heterologous paging indication information is added, performs paging, and a step of notifying to the terminal to be turned on a second network mode.

  A second feature of the present invention includes at least a first network and a second network, and at least a second network from the second network in an overlapping coverage area of the first network and the second network. A paging system of a heterogeneous network in which a paging request for a terminal not operating in the network mode exists, and the first network system corresponding to the first network is configured such that the terminal that is the destination of the paging request is the first If the network node for checking whether it is operating in the network mode and searching the registered location information and the terminal is operating in the first network mode, paging in the first network mode The message contains a paging request from the second network To the terminal to perform paging and turn on the second network mode based on the searched location information and the paging message with the added heterogeneous paging instruction information. Control subsystem to notify.

  According to a third aspect of the present invention, there is provided a terminal used in a heterogeneous network including at least a first network and a second network, wherein the first feature is at least in an overlapping coverage area of the first network and the second network. An access interface that operates only in the network mode, includes at least a first network mode interface and a second network mode interface, and connects to and communicates with the corresponding first network and the second network; A detection unit that detects whether or not a paging instruction is present on the paging instruction channel via the network mode interface of the first network system, and after detecting the paging instruction by the detection unit, secondary common control from the base station of the first network system Physical channel When the next downlink channel frame to be transmitted on board is decoded and the presence / absence of a paging message belonging to the terminal is confirmed, the paging information is further received from the second network. It is determined whether or not it indicates that there is a paging request. If YES is determined, a processing unit that turns on the corresponding second network interface is included.

  According to the above paging method, system and terminal, when a dual mode or multimode terminal is located in an overlapping coverage area of different networks, only one location update is required, so that the signaling process is reduced. Since it is possible to receive services of two or more types of networks with only one type of mode, energy consumption of the terminal is saved.

  In contrast to the contradiction between monitoring and energy consumption for paging messages on the network side of multi-mode terminals in paging of heterogeneous networks, the inventor And found that other networks only generate a few services of the book. When multiple modes are active at the same time, monitoring this low service network paging message and performing location updates will result in too much unnecessary energy consumption and signaling load. Based on the analysis, the present invention provides a paging method and system that can save energy consumption of a multi-mode terminal.

  In the paging method of the present invention, the mobile terminal moves between networks in which dual-mode or multi-mode terminals overlap (an area where the first network and the second network overlap or an area where a plurality of networks overlap). In this case, the terminal may be operated only in one of the modes (for example, the first network mode), and the other modes may be completely turned off to be in a non-operating state. When the terminal is handed over, it is only necessary to perform location update only in the network in the operating mode (first network), and it is not necessary to perform location update in all the mode networks.

  When starting paging from the first network side, the terminal performs the normal paging identical to the current paging mechanism. For example, when paging is started from the second network side, that is, when paging is performed between different network systems, the first network determines whether the terminal that is the destination of the paging operates in the first network mode. Confirm and search the registered location information. When the terminal operates in the first network mode, the first network side adds heterogeneous paging instruction information indicating that paging from the second network exists to the paging message in the first network mode. . Then, the first network side performs paging based on the searched location information and the paging message to which the different type paging instruction information is added, and notifies the terminal that the second network mode is turned on.

<Example 1>
FIG. 1 shows a WAN and LAN heterogeneous network topology structure according to Embodiment 1 of the present invention.

  As shown in FIG. 1, a heterogeneous network of WAN and LAN will be described using networking of WCDMA and WiMAX as an example.

  First, each component unit in FIG. 1 will be described.

  GGSN: GPRS gateway support node, which is connected to the core network and is a functional node in the PS area. Connected to the SGSN via the Gn / Gp interface and connected to the external network via the Gi interface to provide routing and packaging of data packets between the mobile network and the external data network. The main function is a functional interface with an external IP packet network. The GGSN provides a gateway function for the facility to access a packet network outside the network, and when viewed from the external network, the GGSN is a router that can search the IP addresses of all users in the mobile network. And exchange routing information. That is, the GGSN may be regarded as a gateway between the mobile network and the external network.

  HLR: Home location register, which stores location information registered by the terminal.

  SGSN: GPRS service support node that controls and manages packet-switched data traffic. It is connected to the GGSN via the Gn / Gp interface and mainly provides PS area routing transfer, mobility management, session management, authentication and encryption functions.

VLR: Visited location register Node B: Base station RNC: Radio network control station Each of the above units is a known unit in the prior art and can be realized by software or hardware and will not be described in detail here.

  FIG. 2 shows an application environment of the paging method according to the first embodiment of the present invention.

  As shown in FIG. 2, the terminal 1 is located in the overlapping cover area of the WCDMA and WiMAX networks.

  Hereinafter, the implementation process of the paging method according to the first embodiment of the present invention will be described in detail.

  In this embodiment, the terminal 1 can operate in WCDMA and WiMAX modes, that is, it is a dual mode terminal. Since WiMAX is a WCDMA replenishment scheme, the WCDMA air interface is always on, and the WiMAX air interface is turned on only when needed.

  When the terminal 1 moves in an overlapping coverage area of different networks, it is only necessary to operate in the WCDMA mode, and the WiMAX air interface is turned off to save energy. The terminal 1 performs location update in the WCDMA network, and the location information of the terminal is uploaded and stored in the VLR and HLR by the base station of the WCDMA network, and the WiMAX system does not need to perform location update at the same time.

  When there is a paging request from the WCDMA system, the base station and the RNC perform paging using the location information stored in the HLR, and use this location information to specify the specific location where the destination terminal of the paging request is located Find the correct paging area and send a paging message. This is the same as the paging mechanism of the prior art and avoids duplication here.

  When there is a paging request from the WiMAX system, if the terminal 1 is set as the destination terminal for the sake of simplicity in this embodiment, the WiMAX mode of the terminal 1 is in the off state, so the network node (SGSN / VLR) of the WCDMA system , GGSN, HLR) confirms whether the destination terminal of the WiMAX system paging request is operating in the WCDMA network mode. When the terminal 1 is operating in the WCDMA network mode, the control subsystem (RNC and base station) of the WCDMA system performs heterogeneous paging by adding a new information unit to the idle bit of the WCDMA paging message. That is, the WiMAX paging message is transmitted to the terminal 1 by the base station of the WCDMA system, and notifies the dual mode terminal that there is a paging message from another network. In this process, it is necessary to search the paging area where the destination terminal of the paging request of the WiMAX system is located by using the information that the terminal has performed the location update in the WCDMA mode.

  Here, the network node of the WCDMA system checks whether the destination terminal corresponding to the paging request of the WiMAX system is operating in the WCDMA network mode using the information that the terminal has performed the location update in the WCDMA mode. Therefore, in this embodiment, the network node of the WCDMA system has the function of the network node (AG, SS) of the WiMAX system correspondingly, that is, the paging request of the WiMAX system can be identified, and the location update in the WiMAX system Is possible. Briefly, the functions of the network nodes (SGSN / VLR, GGSN, HLR) in this embodiment are a combination of the functions of a conventional WCDMA network node and a WiMAX system network node.

  Here, it should be noted that since the terminal 1 is a dual mode terminal, the destination terminal may be regarded as operating in the WCDMA network mode. When the destination terminal (terminal 1) is a multi-mode terminal and is located in the overlapping coverage area of a plurality of networks, the network node in the plurality of networks indicates in which network mode the destination terminal is operating Confirm. When the destination terminal is operating in the third network mode, the control subsystem in the third network performs heterogeneous paging by adding a new information unit to the idle bit of the third network's paging message. .

  Returning to FIG. 2, in the WCDMA system, after a terminal registers with the network, the terminal is divided into one paging group. When there is a paging message to be transmitted to any terminal of the paging group, a paging instruction (PI, Paging indicator) appears periodically on the paging instruction channel (PICH).

  When detecting the PI, the terminal performs decoding on the next downlink channel (PCH) frame transmitted on the secondary common control physical channel (CCPCH), and determines whether there is a paging message belonging to the terminal. Check. Similarly, when the reliability of the judgment with respect to the PI instruction decreases, the terminal also performs decoding on the PCH frame.

  The smaller the frequency at which the paging instruction appears, the fewer times the terminal is weeked up from the sleep mode and the longer the battery life.

  FIG. 3 shows a paging channel structure adopted in the first embodiment of the present invention.

  As shown in FIG. 3, when there is a paging request from the WiMAX system, a paging instruction (PI, paging indicator) appears on the paging instruction channel (PICH), and in the next downlink channel (PCH) frame, WiMAX. Universal paging information (UPI) indicating paging from the system is included. For example, in the system, the value of the paging information UPI from the WCDMA system may be preset to 0, and the value of the paging information UPI from WiMAX may be preset to 1. If there are multiple networks in the system, the UPI may be set to a value corresponding to each network.

  FIG. 4 shows a message flow of the paging method according to the first embodiment of the present invention.

  As shown in FIG. 4, when the node GGSN in the core network of the WCDMA system receives the paging request W-PR from the WiMAX network, the node SGSN / VLR transmits the paging request via the HLR through the command MT LOOK-UP. Search for the base station where the destination terminal is located.

  After searching the base station where the destination terminal of the paging request is located at the node SGSN / VLR, the node SGSN / VLR responds to the node GGSN with an MT LOOK UP CONFIRM message, and the searched base station Information is included.

  Based on the information of the searched base station, the node GGSN transmits UP MESSAGE to the searched base station and transfers the paging request W-PR under the control of the RNC. Here, the RNC and the base station are collectively referred to as a control subsystem.

  Based on the paging request W-PR, the searched base station updates the paging instruction information UPI (as in PCH in FIG. 3) and transmits the PCH frame.

  The destination terminal of the paging request W-PR decodes the PCH frame, obtains a paging instruction (paging from the WiMAX network) based on the UPI, turns on the WiMAX air interface, and then accesses the WiMAX network. (ADD IE (add Information element) indicates the addition of an information element).

  As described above, the purpose of performing WiMAX network paging for a terminal using the air interface of WCDMA is realized. The location update may be performed in the WCDMA network, or may be performed in the WiMAX network after turning on the WiMAX air interface.

  FIG. 5 shows a configuration of a terminal according to the first embodiment of the present invention.

  As shown in FIG. 5, the terminal 1 includes a processing unit 11, an access interface 12, an update unit 13, and a detection unit 14.

  The update unit 13 performs location registration and update for the system at an appropriate timing such as when the terminal is activated or when a handover is performed. The access interface 12 may include a plurality of network mode interfaces, and communicates with a corresponding network. In this embodiment, the access interface 12 includes a WCDMA air interface and a WiMAX air interface.

  The detection unit 14 detects whether a paging instruction is present on the paging instruction channel via the WCDMA air interface. If it exists, the processing unit 11 is notified.

  After the detection unit 14 detects the paging instruction, the processing unit 11 performs decoding on the next downlink channel frame that is transmitted by the base station mounted on the secondary common control physical channel, and performs paging belonging to the terminal 1 itself. Check for messages. If it is confirmed that there is, it is further determined whether there is an instruction (UPI) indicating heterogeneous network paging in the paging information. When UPI = 1, the corresponding network interface (WiMAX air interface) is turned on. If UPI = 0, the paging request is still completed using the WCDMA air interface. Here, for example, it is assumed that UPI = 0 indicates paging information from WCDMA, and UPI = 1 is specified in advance to indicate paging information from WiMAX.

  Of course, the processing unit 11 of the dual mode terminal may directly determine whether or not the paging information indicates that there is a paging request from the WiMAX network. If present, turn on the WiMAX air interface directly. On the other hand, the processing unit 11 of the multi-mode terminal determines which network the UPI of the paging information indicates and turns on the corresponding network interface.

  Here, when the dual-mode or multi-mode terminal is located in the overlapping coverage area of different networks, the location update by the update unit 13 may be realized by the WCDMA system, or after the WiMAX air interface is turned on, the WiMAX system However, it is not necessary to perform location update in both the WCDMA system and the WiMAX system.

  FIG. 6 shows a performance analysis model of the paging method according to the first embodiment of the present invention. FIG. 7 shows a performance simulation result of the paging method according to the first embodiment of the present invention.

In FIG. 6, P1 indicates power consumption when turning on the WiMAX air interface, and P2 indicates power consumption when the terminal is in a standby state. P4 indicates power consumption when monitoring paging, and P5 indicates power consumption of the voice service.

は、端末がＷｉＭＡＸエアーインタフェースをオンにした後ＷｉＭＡＸネットワークにアクセスするときに消耗したエネルギーを示し、ｓは時間単位である秒を示す。 In the above formula, E indicates energy consumption,

Indicates the energy consumed when the terminal accesses the WiMAX network after turning on the WiMAX air interface, and s indicates the time unit.

P2: P5: P4 = 1: 25: 12.5
P1 = P5 = 24 dBm
Tpower on = t1 = 1.5 s (time period for turning on WiMAX air interface)
Tstandby = t2 = 5.12s (time period in which the terminal is in a standby state. After the time period ends, the terminal enters a calling state or a paging monitor state)
Tpaging = t4 = 0.08s (time period of paging monitor)
Tavgcall = t5 = 3, 5, 10 minutes (average time period of voice call)

は、延長可能な待機時間を示し、

は、異種ページング方法を採用した場合に観察期間内に消耗したエネルギーを示す。

は、伝統的な方法を採用した場合に観察期間内に消耗したエネルギーを示す。

は、端末がＷｉＭＡＸのみで稼働する場合の待機時間を示す。 here,

Indicates a wait time that can be extended,

Indicates the energy consumed within the observation period when the heterogeneous paging method is adopted.

Indicates the energy consumed during the observation period when the traditional method is adopted.

Indicates a standby time when the terminal operates only with WiMAX.

  The assumed conditions are as follows.

(1) Estandby: Ecalling: Epaging = 1: 25: 12.5
(2) Epower on = Ecalling
(3) The standby time lasted when the mobile terminal turned on only the WiMAX air interface is four days.

  As can be seen from the simulation analysis results of FIG. 7, the smaller the average number of calls per day, the longer the standby time, and the shorter the average call time each time, the longer the standby time.

  According to the paging method and system of the present embodiment, when a dual mode or multimode terminal is located in an overlapping coverage area of different networks, only one location update is required. Since it is possible to receive services of two or more types of networks in one type of mode, energy consumption of the terminal is saved.

  In addition, although the present embodiment has been described by taking a heterogeneous network composed of two types of networks (WCDMA and WiMAX) as an example, of course, the present invention is composed of WAN and LAN such as WCDMA, WiMAX, GSM, 3G network or WiFi It can also be applied to heterogeneous networks (a heterogeneous network may include two or more networks).

  Also, the terminal may turn off the corresponding network interface in order to save energy consumption of the terminal after turning on the corresponding network interface based on the UPI information and completing the service through communication.

<Example 2>
FIG. 8 shows the topology structure of WAN and WAN heterogeneous network according to the second embodiment of the present invention.

  In FIG. 8, the WCDMA network is the same as the WCDMA network topology shown in FIG. 1, and the GSM network also adopts a conventional GSM network arrangement. BTS is a transceiver of a base station and is used for radio transmission. The BSC is a base station controller that performs control and management. Also, the WCDMA network and the GSM network overlap each other. For ease of explanation, the conventional GSM network layout is not described in detail here.

  Based on the network topology structure shown in FIG. 8, the GSM network and the WCDMA network may be divided into a primary network and a secondary network, or may be switched to each other.

  The paging method according to the second embodiment is similar to the paging method according to the first embodiment. When the GSM network and the WCDMA network are divided into a primary network and a secondary network, for example, the GSM is a primary network and the WCDMA is a secondary network. In this case, after the terminal 1 turns on the GSM network air interface and receives the paging request from the WCDMA network, the UPI information (UPI = 1) added to the paging information by the control subsystems (BTS and BSC) in the GSM network. If the WCDMA air interface is turned on and UPI = 0, communication is still performed using the GSM network air interface. It is different from the ging method.

  Here, the network node in the GSM network system has a function of identifying a paging request from the WCDMA network and performing location update in the WCDMA network, that is, the network node (SGSN / VLR in the GSM network system and the WCDMA network system). , GGSN, HLR).

  Also, the terminal may turn on one air interface randomly and turn off another air interface and turn it on only when necessary, or turn on one air interface randomly and turn on another. If one of the air interfaces that is randomly turned on does not operate after the one is turned off, the air interface may be turned off.

  Therefore, according to the paging method and system of the present embodiment, when the terminal is located in the overlapping area of two or more WANs, only one location update is required, so that the signaling process is reduced. Since it is possible to receive services of two or more types of networks in one type of mode, mode switching is more flexible, and at the same time, energy consumption of the terminal is saved.

  In this embodiment, the heterogeneous network composed of two types of WANs (WCDMA and GSM) has been described as an example. Of course, the present invention includes a heterogeneous network composed of a plurality of WANs, two LANs, and a plurality of LANs. It can also be applied to heterogeneous networks consisting of

  For the general engineer in the technical field, other excellent points and changes can be easily conceived from the above embodiment. Accordingly, the present invention is not limited to the specific embodiments described above, and the above description is merely a detailed normative description of one aspect of the present invention as an example. Within the scope not departing from the gist of the present invention, a technical plan that a general engineer in the technical field can obtain by equivalent replacement based on the above-described specific embodiments is the scope of the claims of the present invention and equivalents thereof. It will be understood that it falls within the scope.

1 shows a WAN and LAN heterogeneous network topology structure according to Embodiment 1 of the present invention. The application environment of the paging method by Example 1 of this invention is shown. 2 shows a paging channel structure employed in Embodiment 1 of the present invention. 3 shows a message flow of a paging method according to Embodiment 1 of the present invention. The structure of the terminal by Example 1 of this invention is shown. 3 shows a performance analysis model of a paging method according to Embodiment 1 of the present invention. The performance simulation result of the paging method by Example 1 of this invention is shown. 7 illustrates a WAN and WAN heterogeneous network topology structure according to Embodiment 2 of the present invention.

Claims (14)

A heterogeneous network paging method including at least a first network and a second network,
If there is a paging request from the second network at least in the overlapping area of the first network and the second network, the network node in the first network system corresponding to the first network Check whether the request destination terminal is operating in the first network mode and search the registered location information to confirm that the terminal is not operating in the second network mode Steps,
When the control subsystem in the first network system corresponding to the first network is operating in the first network mode, a paging message in the first network mode is sent from the second network to the control subsystem. Adding heterogeneous paging instruction information indicating that there is a paging request of
The control subsystem performing paging based on the searched location information and the paging message to which the heterogeneous paging instruction information is added, and notifying the terminal that the second network mode is turned on. A paging method for heterogeneous networks. If the first network and the second network are WAN and LAN, respectively, the terminal operates in the first network mode and turns on the second network mode only when there is a paging request from the LAN. ,
When both the first network and the second network are WANs, or when both the first network and the second network are LANs, the terminal operates by randomly selecting an arbitrary network mode. 2. The paging method according to claim 1, wherein the other network mode is turned on only when there is a paging request from one network.   After the terminal completes the service by turning on the second network mode, the terminal stops operating in the second network mode, or if the service does not occur in the first network, the terminal continues to the second network mode. 3. The paging method according to claim 2, wherein the paging method is stopped and the operation in the first network mode is stopped. When the overlapping cover area is an overlapping cover area of a plurality of networks, each network system corresponding to the plurality of networks confirms in which network mode the terminal that is the destination of the paging request is operating. 4. The paging method according to claim 3, wherein paging is performed by adding heterogeneous paging instruction information to the network mode paging message.   5. The paging method according to claim 1, wherein, when two network modes are simultaneously turned on, the terminal updates location information only in one network mode. 6. A terminal that includes at least a first network and a second network and is not operating in the second network mode from the second network in at least an overlap coverage area of the first network and the second network A paging system of a heterogeneous network in which there is a paging request for
The first network system corresponding to the first network is
A network node for checking whether or not the terminal that is the destination of the paging request is operating in the first network mode, and searching for the registered location information;
When the terminal is operating in the first network mode, the heterogeneous paging instruction information indicating that a paging request from the second network exists is added to the paging message in the first network mode, and the searched position And a control subsystem for notifying the terminal that the second network mode is turned on based on the information and the paging message to which the heterogeneous paging instruction information is added. Paging system.   The paging system according to claim 6, wherein a network node in the first network system has a function of identifying a paging request from the second network and performing a location update in the second network. If the first network and the second network are WAN and LAN, respectively, the terminal operates in the first network mode and turns on the second network mode only when there is a paging request from the LAN. ,
When both the first network and the second network are WAN, or when both the first network and the second network are LANs, the terminal operates by randomly selecting an arbitrary network mode. 8. The paging system according to claim 7, wherein the other network mode is turned on only when there is a paging request from one network.   After the terminal completes the service by turning on the second network mode, the terminal stops operating in the second network mode, or if the service does not occur in the first network, the terminal continues to the second network mode. 9. The paging system according to claim 8, wherein the paging system is operated in the first network mode and the operation in the first network mode is stopped.   When the overlap cover area is an overlap cover area of a plurality of networks, each network system corresponding to the plurality of networks confirms and confirms in which network mode the terminal that is the destination of the paging request is operating The paging system according to claim 9, wherein paging is performed by adding heterogeneous paging instruction information to a paging message in a network mode.   The paging system according to any one of claims 6 to 10, wherein when the two network modes are turned on at the same time, the terminal updates location information using any one network system. A terminal used in a heterogeneous network including at least a first network and a second network, and operates only in the first network mode in an overlapping coverage area of at least the first network and the second network;
An access interface for connecting to and communicating with the corresponding first network and the second network, including at least a first network mode interface and a second network mode interface;
A detection unit for detecting whether there is a paging indication on the paging indication channel via the first network mode interface;
After the paging instruction is detected by the detection unit, decoding is performed on the next downlink channel frame transmitted from the base station of the first network system on the secondary common control physical channel, and the paging message belonging to the terminal is decoded. When it is confirmed that there is a paging request from the second network, it is further determined whether or not the paging information indicates that there is a paging request from the second network. And a processing unit for turning on the interface.   The terminal according to claim 12, further comprising an update unit for performing location registration and update for the system.   The processing unit determines which network the paging information indicates and turns on a corresponding network interface when the terminal is located in an overlapping coverage area of a plurality of networks. Item 14. The terminal according to Item 13.

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