JP2011250173A - Radio communication equipment, mobile terminal device, and radio communication method - Google Patents

Abstract

A radio communication apparatus, a mobile terminal apparatus, and a radio communication method capable of realizing further power saving when a mobile terminal apparatus UE having an interface corresponding to a plurality of radio communication systems with different coverages performs handover. .
The wireless communication method of the present invention receives broadcast information from a system other than its own system in a wireless communication apparatus in a wireless communication system including a plurality of systems with different coverages, and receives the broadcast information of each system received. Is transmitted to a mobile terminal apparatus having a plurality of interfaces corresponding to a plurality of systems, and the mobile terminal apparatus separates the multiplexed notification information, and Of these, control for stopping interfaces other than the broadcast information receiving interface is performed.
[Selection] Figure 2

Description

  The present invention relates to a wireless communication apparatus, a mobile terminal apparatus, and a wireless communication method that perform wireless communication using a plurality of wireless communication systems.

  In recent years, services of wireless communication systems using various communication methods have been provided. For example, 3GPP (3 Generation Partnership Project), which is a standardization organization, defines W-CDMA (Wideband Code Division Multiple Access), HSPA (High Speed Packet Access), LTE (Long Term Evolution), and the like. The IEEE (Institute of Electrical and Electronic Engineers) 802 Committee defines wireless LAN (Wi-Fi (registered trademark): Wireless Fidelity), wireless MAN (WiMAX: Worldwide Interoperability for Microwave Access), and the like. Furthermore, an XGP (eXtended Global Platform) service that is a next-generation PHS system has also been started.

  Each communication system has different characteristics with respect to a frequency band, a peak data rate, a transmission distance, and the like, and a wireless communication apparatus capable of communicating with a wireless communication system using such a plurality of different communication systems has been proposed. (For example, patent document 1).

JP 2005-101820 A

  In general, as shown in FIG. 1, mobile terminal devices that can be used in a plurality of systems having different coverages (system # 1 to system # 3 in FIG. 1) are interfaces (wireless communication) corresponding to the respective wireless communication systems. A communication system can be selected to perform communication using a desired wireless communication system. For example, as shown in FIG. 1, when coverages overlap at different frequencies and different systems, that is, in a state where handover is possible, the mobile terminal apparatus UE having an interface corresponding to the system # 1 to the system # 3 Can communicate in the system # 1 to the system # 3. Here, handover refers to handover between different frequencies, handover between different systems, or parallel use of multiple frequencies or multiple systems.

  When performing a handover, it is necessary to collect information on the frequency and system of the handover destination in advance. In this case, the information is collected by receiving notification information notified from the system. For this reason, in the mobile terminal apparatus UE having an interface corresponding to the system # 1 to the system # 3, it is necessary to activate the interfaces related to all the systems in order to collect information (in FIG. 1, the system # 1 to the system # Set all 3 to ON). As a result, although the communication is not actually performed, the interface is activated, and power consumption in the mobile terminal apparatus UE increases.

  Conventionally, as a power saving method in such a case, there are DRX (Discontinuous Reception) in LTE (Long Term Evolution) system, PS (Power Saving) mode in WLAN (IEEE802.11) system, APSD (Automatic Power Save Delivery), etc. is there. In these modes, the interface is intermittently activated to attempt reception, and the interface is not completely turned off, so that power consumption occurs.

  The present invention has been made in view of the above points, and a radio communication apparatus capable of realizing further power saving when a mobile terminal apparatus UE having an interface corresponding to a plurality of radio communication systems with different coverages is handed over, An object is to provide a mobile terminal device and a wireless communication method.

  The wireless communication device of the present invention is a wireless communication device in a wireless communication system including a plurality of systems with different coverages, and includes broadcast information receiving means for receiving broadcast information from systems other than its own system, and each received system Broadcast information multiplexing means for multiplexing the broadcast information, and transmission means for transmitting the multiplexed broadcast information to the mobile terminal apparatus.

  The mobile terminal device of the present invention is a mobile terminal device provided with a plurality of interfaces corresponding to a plurality of systems with different coverage, and a broadcast information receiving interface for receiving multiplexed broadcast information from a specific system, It is characterized by comprising broadcast information separating means for separating the multiplexed broadcast information, and power supply control means for performing control to stop an interface other than the broadcast information receiving interface.

  In the wireless communication method of the present invention, in a wireless communication apparatus in a wireless communication system including a plurality of systems with different coverages, a step of receiving broadcast information from a system other than the own system, and the received broadcast information of each system are multiplexed. A step of transmitting multiplexed notification information to a mobile terminal device having a plurality of interfaces corresponding to a plurality of systems, a step of separating multiplexed notification information in the mobile terminal device, And a step of performing control to stop an interface other than the notification information receiving interface among the plurality of interfaces.

  According to the present invention, when the mobile terminal apparatus UE having an interface corresponding to a plurality of radio communication systems with different coverage is handed over, further power saving can be realized.

It is a figure for demonstrating the radio | wireless communications system containing the several system of a different coverage. It is a figure for demonstrating the one aspect | mode of the radio | wireless communication method which concerns on embodiment of this invention. It is a figure for demonstrating the other aspect of the radio | wireless communication method which concerns on embodiment of this invention. It is a figure for demonstrating proper use of the wire and radio | wireless in the radio | wireless communication method which concerns on embodiment of this invention. (A)-(c) is a figure for demonstrating the interface selection in the radio | wireless communication method which concerns on embodiment of this invention. It is a flowchart for demonstrating the interface selection in the radio | wireless communication method which concerns on embodiment of this invention. It is a sequence diagram for demonstrating the radio | wireless communication method which concerns on embodiment of this invention. It is a functional block diagram of the radio | wireless communication apparatus in the radio | wireless communications system which concerns on embodiment of this invention. It is a functional block diagram of the mobile terminal apparatus in the radio | wireless communications system which concerns on embodiment of this invention. It is a figure for demonstrating the aggregation system in the radio | wireless communications system which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following embodiment, an example in which the mobile terminal device is applied to a mobile phone will be described. However, the present invention is not limited to this configuration. In the present invention, the mobile terminal device may be any device that can communicate with a plurality of wireless communication systems. For example, the mobile terminal device is applied to a desktop PC, a notebook PC, a PDA (Personal Digital Assistant), a portable game machine, and the like. It is also possible to do.

  An outline of a configuration of a wireless communication system to which the mobile terminal device belongs will be described with reference to FIG. Note that the configuration of the wireless communication system illustrated in FIG. 2 is merely an example, and is not limited to this configuration. That is, in the present invention, the configuration of the wireless communication system may be a configuration including a plurality of wireless communication systems with different coverages. Examples of the plurality of wireless communication systems include, but are not limited to, a wireless LAN (IEEE802.11) system, a 3G / LTE system, and an ISDB-T system.

  In FIG. 2, the wireless communication system includes a plurality (three) of wireless communication systems (system # 1 to system # 3) having different coverages, and the coverage of each system overlaps. In FIG. 2, system # 1 has the widest coverage, system # 2 has the next widest coverage, and system # 3 has the narrowest coverage. In system # 1, the coverage area of system # 2 and the coverage area of system # 2 overlap in the coverage area of system # 2, and in the coverage area of system # 3, the coverage area of system # 1 and the system # 2 The coverage area of # 2 and the coverage area of system # 3 overlap. Therefore, the mobile terminal apparatus UE communicates with the radio base station apparatus or access point of the system # 1 in the coverage area of the system # 1 alone, and the radio of the system # 1 and the system # 2 in the coverage area of the system # 2. It communicates with a base station apparatus, an access point, etc., and communicates with a radio base station apparatus, an access point, etc. of system # 1 to system # 3 in the coverage area of system # 3.

  The inventors of the present invention can collect notification information of all systems by activating only one interface of a mobile terminal device by aggregating notification information individually reported in a plurality of systems in one system. The headline has led to the present invention.

  That is, the gist of the present invention is to receive broadcast information from a system other than its own system in a wireless communication apparatus including a plurality of systems with different coverage, multiplex the received broadcast information of each system, The multiplexed broadcast information is transmitted to a mobile terminal apparatus having a plurality of interfaces corresponding to a plurality of systems, and the multiplexed broadcast information is separated at the mobile terminal apparatus, and broadcast information reception is performed among the plurality of interfaces. By controlling to stop interfaces other than the standard interface, it is possible to realize further power saving when the mobile terminal apparatus UE having an interface corresponding to a plurality of radio communication systems with different coverage is handed over.

  In the wireless communication system described above, there are two methods depending on the coverage area where the mobile terminal apparatus is located.

(First method)
As shown in FIG. 2, when the mobile terminal apparatus UE belongs (is located) to the system (system # 3) with the narrowest coverage, as described above, the mobile terminal apparatus UE has all the systems (system #). 1 to system # 3) because it can communicate with the wireless base station device and access point of the system (because it can communicate with the wireless base station device and access point of the system with the narrowest coverage), the system with the narrowest coverage The broadcast information of all systems is acquired by wirelessly relaying the wireless base station apparatus and access point. That is, the system (system # 3) to which the mobile terminal device UE currently belongs broadcasts the broadcast information from the system having a wide coverage (system # 1, # 2) (using all the carrier waves of the system # 1) Broadcast information). Note that the attribution system (system # 3) is included in the coverage of a wide range of systems (system # 1 and # 2).

  As described above, since the system (system # 3) to which the mobile terminal apparatus UE currently belongs relays the broadcast information from the system (system # 1, # 2) having a wide coverage, the mobile terminal apparatus UE currently belongs. By starting only the interface of the system to be activated, notification information of all systems can be acquired. In FIG. 2, it is possible to acquire the notification information of all the systems with only the interface of the system # 3 turned on and the interfaces of the other systems # 1 and # 2 turned off. Thereby, when the mobile terminal apparatus UE having an interface corresponding to a plurality of radio communication systems with different coverage is handed over, further power saving can be realized.

(Second method)
As shown in FIG. 3, when the mobile terminal apparatus UE belongs (is located) to the system with the widest coverage (system # 1), the mobile terminal apparatus UE is a radio base of one system (system # 1). Because it can communicate with station devices and access points (because it cannot communicate with wireless base station devices and access points of systems with narrower coverage), wireless base station devices and access points of systems with narrower coverage Broadcast information of all systems is acquired by wire relay. That is, broadcast information from a system (system # 2, # 3) having a narrower coverage is wired to system # 1, and all the carrier waves of the system (system # 1) to which the mobile terminal UE currently belongs are all transmitted. Broadcast information is transmitted.

  In this way, broadcast information from a system (system # 2, # 3) having a narrower coverage is wired to system # 1, and the carrier wave of the system (system # 1) to which the mobile terminal device UE currently belongs is transmitted. Since all broadcast information is transmitted, broadcast information of all systems can be acquired by activating only the interface of the system to which the mobile terminal apparatus UE currently belongs. In FIG. 3, the notification information of all the systems can be acquired in a state where only the interface of the system # 1 is turned on and the interfaces of the other systems # 2 and # 3 are turned off. Thereby, when the mobile terminal apparatus UE having an interface corresponding to a plurality of radio communication systems with different coverage is handed over, further power saving can be realized.

  When the mobile terminal apparatus UE that has acquired the broadcast information of all systems in this way determines that handover is necessary based on the acquired broadcast information, the mobile terminal apparatus UE activates the interface of the corresponding system and moves to the handover operation. Since the handover operation is the same as the normal handover operation, the description thereof is omitted.

  Here, the broadcast information is periodically broadcast to all mobile terminal apparatuses UE under control of coverage from radio base station apparatuses (BTS / eNB) and access points (AP) (hereinafter referred to as BTS) belonging to each system. Information. For example, system information (for example, QoS information such as system maximum throughput / delay, billing information), a wireless LAN system (IEEE802.80) broadcasted when connecting to a BTS for the first time or when performing handover from another BTS or the like. .11) beacon frame, 3G / LTE system MIB (Master Information Block) / SIB (System Information Block), and ISDB-T / Tmm system ECG (Electric Contents Guide).

  Next, selection of the first method and the second method will be described. In this selection, there are a preset method and a dynamically set method.

  In the preset method, the BTS or the like compares each interface to determine wired / wireless. In this case, a table as shown in FIG. 4 is created. The table shown in FIG. 4 is based on the system configuration shown in FIGS. 2 and 3, for example. From system # 2 via system # 1, system # 1 relays notification information from system # 2. In this case, select wired. From system # 1 via system # 3 means that system # 3 relays broadcast information from system # 1, and in this case, radio is selected. Note that the table shown in FIG. 4 is an example, and the selection of wired / wireless is not limited to this.

  In the method of dynamically setting, each BTS, etc., participates in an area (each BTS, etc., uses either wired or wireless as a backhaul line for notification in order to relay notification information by other BTS, etc. When determining whether to use a wired or wireless backhaul line for notification. In order to determine the method (wired / wireless) used in the backhaul line, the BTSs and the like confirm each other's presence using a 3-way handshake. In the 3-way handshake, as shown in FIG. 5C, first, the system # 2 can be used from the BTS etc. of the system # 2 to the BTS etc. of the system # 1, and a notification by the system # 1 is requested. (# 2 Available Request). Next, when the notification is received by the system # 1, the ACK for the # 2 Available Request and the notification by the system # 2 of the system # 1 are requested from the BTS of the system # 1 to the BTS of the system # 2 (# 1 Available Request). Next, an ACK is returned from the BTS etc. of the system # 2 to the BTS etc. of the system # 1 (# 1 Available ACK).

  When such a 3-way handshake is adopted, there is a problem when the notification signal does not reach other BTSs in the first place, or when the notification signal arrives but the confirmation message does not arrive. Is considered to occur.

  As shown in FIG. 5 (a), in the case where the system broadcast information does not arrive in the first place, that is, in the case where no ACK for # 2 Available Request is returned from system # 1 in FIG. 5 (a), system # 2 Repeats retransmission until a certain timer expires, and if no ACK is returned until the timer expires, performs communication by wired connection. Then, system # 2 → system # 1 is set to wired. Next, after receiving # 2 Available Request, the system # 1 performs wireless communication with the system # 2. If the # 1 Available Request from the system # 1 does not arrive via the radio, the above operation (retransmission until the timer expires) is performed, and the backhaul line of the system # 1 → system # 2 is switched to wired. Thereafter, after Available Request # 1 reaches system # 2, system # 2 returns ACK to system # 1 by wire (set as described above).

  As shown in FIG. 5B, in the environment where the system broadcast information can be received but cannot return ACK, that is, in FIG. 5B, system # 2 can receive # 1 Available Request but cannot return ACK. In this case, the system # 2 repeats retransmission until a certain timer expires, and performs communication by wired connection if ACK is not returned until the timer expires. At this time, system # 2 → system # 1 is set to wired, and system # 1 → system # 2 is set to wireless.

  In the case shown in FIG. 5 (a) and the case shown in FIG. 5 (b), control is performed to retransmit until the timer expires. In this case, the resource is wasted if it is retransmitted from the Request even though the ACK has not arrived. For this reason, it is desirable to identify whether the Request has not arrived or the ACCK has not arrived. For this reason, in order to determine Request non-delivery after first determining ACK non-delivery, the timer period for ACK non-delivery determination (FIG. 5B) is the Request non-delivery determination (FIG. 5A). ) Is preferably shorter than the timer period.

  On the other hand, as shown in FIG. 5C, when the broadcast information arrives without any problem and ACK can be returned, the three-way handshake is completed in the wireless section. At this time, the system # 1 and the system # 2 are wirelessly connected in both directions.

  The dynamic setting procedure described above will be described with reference to FIG. FIG. 6 is a flowchart for explaining the procedure of dynamic setting (determination of means (wired, wireless) for relaying broadcast information of system # 1) in the wireless communication method according to the present invention. Since the return destination is already known by the broadcast of the system # 1, the response side (system # 2 in FIG. 6) unicasts the ACK for the system # 1 and the Available Request of the system # 2, and FIG. Execute according to the flow shown in

  First, an available request (# 1 available request) is broadcast to surrounding system # 2 using a wireless interface that can be transmitted by system # 1 (ST11). System # 1 determines whether or not an ACK is returned from system # 2 (ST12). If ACK is returned from system # 2, system # 1 sets radio as a means for relaying broadcast information to system # 2 (ST13). On the other hand, if ACK is not returned from system # 2, after waiting for a predetermined time, an available request (# 1 available request) is broadcast to system # 2 using a transmittable wired interface (ST14).

  Next, system # 1 determines whether or not an ACK (ACK for # 1 Available Request) from system # 2 has been returned (ST15). If the ACK is returned from the system # 2, the system # 1 sets a wire to the means for relaying the notification information to the system # 2 (ST16). On the other hand, if ACK is not returned from system # 2, system # 2 determines that broadcast information cannot be relayed (ST17).

  Hereinafter, a specific example of a wireless communication method in the above-described wireless communication system will be described in detail with reference to the drawings. FIG. 7 is a sequence diagram for explaining registration / initial connection in the wireless communication method of the present invention. In FIG. 7, a plurality of (three) wireless communication systems (system # 1 to system # 3) having different coverages are included, and the coverages of the respective systems are overlapped. In FIG. 2, a wireless communication system is assumed in which system # 1 has the widest coverage, system # 2 has the next widest coverage, and system # 3 has the narrowest coverage.

  First, in the mobile terminal apparatus UE, all the interfaces of the system # 1 to the system # 3 are activated (ST21). In this state, the mobile communication terminal UE receives broadcast information from each of the systems # 1 to # 3. The mobile terminal apparatus UE selects an interface waiting for the broadcast information according to the reception status of the broadcast information (ST22). This interface selection is performed by the above-described method (a preset method or a dynamically set method). In this case, the interface of system # 3 having the narrowest coverage is selected. The mobile terminal apparatus UE receives other information (here, system # 1 and system # 2) from the system corresponding to the selected interface (here, system # 3 (broadcast information standby system)). Register. For example, the fact that the notification information of the cellular system is received using a wireless LAN is registered.

  Thereafter, the mobile terminal apparatus UE turns off an interface corresponding to a system other than the broadcast information standby system (ST23). In the system # 3, if the notification information receiving interface is not activated, the interface is activated. In this state, the broadcast information standby system (system # 3) receives broadcast information transmitted from a system (system # 1, system # 2) other than the broadcast information standby system. At this time, the notification information may be received wirelessly or by wire. And system # 3 multiplexes system information other than the broadcast information standby system (system # 1, system # 2) and broadcast information of its own system and transmits them to the mobile terminal apparatus UE (ST24). In this way, after receiving the broadcast information necessary for the handover, the handover operation is started based on the broadcast information.

  The mobile terminal apparatus UE determines whether to switch the broadcast information standby interface (ST25). This switching determination can be made, for example, by detecting that the received power has decreased or that the received signal quality has deteriorated. Thereafter, the interface after the switching determination is activated (ST26). And as mentioned above, the other system which wants to receive alerting | reporting information is registered (notification information standby system registration).

  In this way, in this wireless communication system, since broadcast information individually broadcast in a plurality of systems is aggregated in one system, only one interface of the mobile terminal device is activated to broadcast information of all systems. Can be obtained. For this reason, when the mobile terminal apparatus UE having an interface corresponding to a plurality of radio communication systems with different coverages performs handover, further power saving can be realized.

  Below, an example of the structure of the radio base station apparatus and mobile terminal apparatus applied to the radio | wireless communications system mentioned above is demonstrated. In addition, the structure in the following description is an illustration to the last, Comprising: It is not limited to this structure.

  With reference to FIG. 8, the functional configuration of the radio communication apparatus (BTS, eNB, AP) will be described. FIG. 8 is a functional block diagram of a wireless communication apparatus in the wireless communication system according to the embodiment of the present invention. Here, a case where the wireless communication apparatus is an access point of system # 3 will be described.

  As illustrated in FIG. 8, the wireless communication device includes interfaces (wireless communication units (broadcast information receiving units)) corresponding to a plurality of systems. The wireless communication apparatus includes a broadcast information receiving unit (wireless) 102 that receives broadcast information from each system via an antenna 101, a broadcast information receiving unit (wired) 103 that receives broadcast information from each system by wire, A broadcast information multiplexing unit 104 that multiplexes received broadcast information, a power control unit 105 that controls ON / OFF of broadcast information receiving units 102 and 103 that are interfaces, and a broadcast information generation unit 106 that generates broadcast information of its own system. And broadcast information reception target system registration unit 107 that registers the broadcast information reception target system, and wireless communication unit 108 that transmits the broadcast information multiplexed via antenna 109 and transmits and receives other signals. ing.

  Broadcast information receiving section (wireless) 102 receives broadcast information from other systems # 1 and # 2 by radio. That is, the broadcast information receiving unit (wireless) (system # 1) receives broadcast information from the system # 1 wirelessly, and the broadcast information receiving unit (wireless) (system # 2) is broadcast information from the system # 2. Is received wirelessly. Broadcast information receiving section (wireless) 102 outputs the received broadcast information to broadcast information multiplexing section 104.

  The broadcast information receiving unit (wired) 103 receives broadcast information from the other systems # 1 and # 2 by wire. That is, the notification information receiving unit (wired) (system # 1) receives the notification information from the system # 1 by wire, and the notification information receiving unit (wired) (system # 2) is the notification information from the system # 2. Is received by wire. The broadcast information receiving unit (wired) 103 outputs the received broadcast information to the broadcast information multiplexing unit 104.

  The notification information generation unit 106 generates notification information of the own system (system # 3). The broadcast information generating unit 106 outputs the generated broadcast information to the broadcast information multiplexing unit 104. The broadcast information multiplexing unit 104 multiplexes broadcast information of its own system (system # 3) and broadcast information of other systems (systems # 1 and # 2) based on registration information of the broadcast information reception target system. The registration information of the broadcast information reception target system is acquired from the broadcast information reception target system registration unit 107. The broadcast information multiplexing unit 106 outputs the multiplexed broadcast information to the wireless communication unit 108.

  The power supply control unit 105 performs control to start / stop the notification information receiving interface. For example, the power supply control unit 105 controls to start a broadcast information receiving unit that is an interface for receiving broadcast information, and controls to stop a broadcast information receiving unit that is not an interface for receiving broadcast information. In this case, the power supply control unit 105 performs control for starting and stopping the notification information reception interface based on the registration information of the notification information reception target system. The registration information of the broadcast information reception target system is acquired from the broadcast information reception target system registration unit 107.

  The broadcast information reception target system registration unit 107 registers the registration information of the broadcast information reception target system (information from which system the broadcast information is acquired) sent from the mobile terminal device. The broadcast information reception target system registration unit 107 outputs the broadcast information reception target system registration information to the power control unit 105 and the broadcast information multiplexing unit 104.

  The wireless communication unit 108 transmits the broadcast information multiplexed through the antenna 109 and transmits / receives other signals. The wireless communication unit 108 transmits and receives Requests and ACKs in the 3-way handshake.

  With reference to FIG. 9, the functional configuration of the mobile terminal apparatus will be described. FIG. 9 is a functional block diagram of the mobile terminal apparatus in the radio communication system according to the embodiment of the present invention.

  As shown in FIG. 9, the mobile terminal device includes interfaces (wireless communication units) each corresponding to a plurality of systems. The mobile terminal apparatus includes a radio communication unit 202 that communicates with each system via an antenna 201, a broadcast information separation / analysis unit 203 that separates multiplexed broadcast information and analyzes broadcast information, and an interface. A power supply control unit 204 that controls ON / OFF of a certain wireless communication unit 202 and a handover processing unit 205 that controls a handover operation are mainly configured.

  The wireless communication unit 202 communicates with each system # 1 to # 3. The wireless communication unit (system # 1) 202 is an interface corresponding to the system # 1, and communicates with the wireless base station device and the access point of the system # 1, and the wireless communication unit (system # 2) 202 , Which is an interface corresponding to the system # 2, and communicates with the wireless base station apparatus and the access point of the system # 2, and the wireless communication unit (system # 3) 202 is an interface corresponding to the system # 3, Communication is performed with the radio base station apparatus and access point of system # 3. Each wireless communication unit 202 receives multiplexed broadcast information. For example, if the notification information standby interface is the wireless communication unit (system # 1) 202, the wireless communication unit (system # 1) 202 receives multiplexed notification information, and the notification information standby interface is wireless communication. Section (system # 2) 202, the wireless communication section (system # 2) 202 receives multiplexed broadcast information, and if the broadcast information standby interface is the wireless communication section (system # 3) 202, The wireless communication unit (system # 3) 202 receives the multiplexed broadcast information. The wireless communication unit 202 outputs the multiplexed notification information to the notification information separation / analysis unit 203.

  The broadcast information separation / analysis unit 203 separates the multiplexed broadcast information and analyzes the content of the separated broadcast information. That is, the notification information separation / analysis unit 203 recognizes which system the separated notification information is related to. The broadcast information separation / analysis unit 203 outputs the broadcast information to the handover processing unit 205.

  The power supply control unit 204 performs control for starting and stopping the notification information standby interface. For example, the power supply control unit 204 controls to start the wireless communication unit 202 that is a notification information standby interface, and controls to stop the wireless communication unit 202 that is not a notification information standby interface. In this case, the power supply control unit 204 performs control to start / stop the notification information standby interface based on the selection result when the notification information standby interface is selected. The selection of the notification information standby interface uses the previously set method and the dynamically set method described above. In the dynamic setting method, the three-way handshake is performed between the wireless communication unit 202 and the wireless communication unit 108 of the wireless communication device.

  The handover processing unit 205 performs a handover operation based on the content of the broadcast information of each system. Since the handover operation is a normal handover operation, the description thereof is omitted.

  A case where the wireless communication method of the present invention is performed in the wireless communication system having the above configuration will be described. First, the case of the configuration shown in FIG. 2 (when notification information from another system is acquired wirelessly) will be described. Since the mobile terminal apparatus UE belongs to the system # 3, the interface corresponding to the system # 3 is selected as the broadcast information standby interface. This selection information is output to the power supply control unit 204. The power supply control unit 204 stops the activation of interfaces other than the notification information standby interface based on the selection information. Here, the wireless communication unit (system # 1) and the wireless communication unit (system # 2), which are interfaces corresponding to the systems # 1 and # 2, are stopped. The selection information is transmitted from the mobile terminal device to the wireless communication device, and is registered in the broadcast information reception target system registration unit 107 of the wireless communication device (system # 3).

  To the wireless communication device (system # 3), the notification information of system # 1 and the notification information of system # 2 are transmitted wirelessly from the wireless communication device of system # 1 and the wireless communication device of system # 2, respectively. In the wireless communication device (system # 3), the broadcast information receiving unit (wireless) (system # 1) receives the broadcast information of the system # 1, and the broadcast information receiving unit (wireless) (system # 2) receives the system # 2. The broadcast information is received. Further, the notification information of the system # 3 is generated by the notification information generation unit 106. The broadcast information is multiplexed by the broadcast information multiplexing unit 104 and transmitted from the wireless communication unit 108 to the mobile terminal device.

  In the mobile terminal apparatus, the radio communication unit (system # 3) receives the multiplexed broadcast information, and the broadcast information separation / analysis unit 203 separates the multiplexed broadcast information. Then, the handover processing unit 205 performs a handover process using the separated notification information.

  Next, the case of the configuration shown in FIG. 3 (when notification information from another system is acquired by wire) will be described. Since the mobile terminal apparatus UE belongs to the system # 1, the interface corresponding to the system # 1 is selected as the broadcast information standby interface. This selection information is output to the power supply control unit 204. The power supply control unit 204 stops the activation of interfaces other than the notification information standby interface based on the selection information. Here, the wireless communication unit (system # 2) and the wireless communication unit (system # 3), which are interfaces corresponding to the systems # 2 and # 3, are stopped. The selection information is transmitted from the mobile terminal device to the wireless communication device, and is registered in the broadcast information reception target system registration unit 107 of the wireless communication device (system # 1).

  To the wireless communication device (system # 1), the notification information of system # 2 and the notification information of system # 3 are sent by wire from the wireless communication device of system # 2 and the wireless communication device of system # 3, respectively. In the wireless communication apparatus (system # 1), the broadcast information receiving unit (wired) (system # 2) receives the broadcast information of system # 2, and the broadcast information receiving unit (wired) (system # 3) receives system # 3. The broadcast information is received. Further, the notification information of the system # 1 is generated by the notification information generation unit 106. The broadcast information is multiplexed by the broadcast information multiplexing unit 104 and transmitted from the wireless communication unit 108 to the mobile terminal device.

  In the mobile terminal apparatus, the radio communication unit (system # 1) receives the multiplexed broadcast information, and the broadcast information separation / analysis unit 203 separates the multiplexed broadcast information. Then, the handover processing unit 205 performs a handover process using the separated notification information.

  As described above, in the present invention, since broadcast information individually broadcast in a plurality of systems is aggregated in one system, only one interface of the mobile terminal device is activated to obtain broadcast information of all systems. it can. Thereby, when the mobile terminal apparatus UE having an interface corresponding to a plurality of radio communication systems with different coverage is handed over, further power saving can be realized.

  In the present invention, the case classification of the aggregation system (which system is used to receive the broadcast information) is selected according to user decision making using some criteria (mobility throughput, etc.). For example, AHP (stratified decision making technique) can be used. By using this AHP, it is possible to select an alternative to the utilization system using a standard and a weight for the standard. For example, FIG. 10 shows selection criteria and selection examples.

  The embodiment disclosed this time is illustrative in all respects and is not limited to this embodiment. The scope of the present invention is shown not by the above description of the embodiments but by the scope of the claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

101, 109, 201 Antenna 102 Broadcast information receiver (wireless)
103 Notification information receiver (wired)
104 Broadcast information multiplexing unit 105, 204 Power control unit 106 Broadcast information generation unit 107 Broadcast information reception target system registration unit 108, 202 Radio communication unit 203 Broadcast information separation / analysis unit 205 Handover processing unit

Claims (11)

  A wireless communication apparatus in a wireless communication system including a plurality of systems with different coverages, broadcast information receiving means for receiving broadcast information from systems other than the own system, and broadcast information for multiplexing the received broadcast information of each system A wireless communication apparatus comprising: multiplexing means; and transmitting means for transmitting multiplexed broadcast information to a mobile terminal apparatus.   The wireless communication apparatus according to claim 1, wherein broadcast information from the other system is acquired wirelessly.   The wireless communication apparatus according to claim 1, wherein the notification information from the other system is acquired by wire.   The wireless communication device according to any one of claims 1 to 3, wherein information on a notification information standby interface from a mobile terminal device is registered.   The wireless communication apparatus according to any one of claims 1 to 4, wherein the wireless communication apparatus is a wireless base station apparatus or an access point.   A mobile terminal device having a plurality of interfaces corresponding to a plurality of systems having different coverages, and separating the multiplexed notification information from a notification information receiving interface that receives multiplexed notification information from a specific system A mobile terminal apparatus comprising: broadcast information separating means for performing power supply control means for performing control to stop an interface other than the broadcast information receiving interface.   The mobile terminal apparatus according to claim 6, further comprising handover processing means for performing a handover operation using the broadcast information.   In a wireless communication device in a wireless communication system including a plurality of systems with different coverages, a step of receiving broadcast information from a system other than the own system, a step of multiplexing the received broadcast information of each system, and a multiplexed broadcast A step of transmitting information to a mobile terminal device having a plurality of interfaces corresponding to a plurality of systems; a step of separating multiplexed broadcast information in the mobile terminal device; and reception of broadcast information among the plurality of interfaces And a step of performing control to stop an interface other than the communication interface.   The wireless communication method according to claim 8, wherein broadcast information from the other system is acquired wirelessly.   The wireless communication method according to claim 8 or 9, wherein the notification information from the other system is acquired by wire.   The radio communication method according to any one of claims 8 to 10, further comprising a step of performing a handover operation using the broadcast information in the mobile terminal device.

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