WO2007129595A1 - 移動無線通信システム及び同システムにおけるハンドオーバー実行方法 - Google Patents
移動無線通信システム及び同システムにおけるハンドオーバー実行方法 Download PDFInfo
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- WO2007129595A1 WO2007129595A1 PCT/JP2007/059070 JP2007059070W WO2007129595A1 WO 2007129595 A1 WO2007129595 A1 WO 2007129595A1 JP 2007059070 W JP2007059070 W JP 2007059070W WO 2007129595 A1 WO2007129595 A1 WO 2007129595A1
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- Prior art keywords
- radio
- communication terminal
- wireless
- transmission operation
- terminal device
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/26—Reselection being triggered by specific parameters by agreed or negotiated communication parameters
Definitions
- the present invention relates to a handover technique for a mobile radio communication network. Specifically, the present invention relates to a mobile radio communication system, a handover execution method in the system, a radio station in the system, a portable mobile communication terminal apparatus in the system, and the radio station to execute the handover one execution method. And a program for causing the portable mobile communication terminal apparatus to execute the handover execution method.
- Patent Document 1 describes an example thereof!
- the mobile mobile terminal device When the mobile mobile terminal device is communicating with the first base station and is moving from the first base station to the second base station adjacent to the first base station. Is assumed.
- the mobile mobile terminal detects a decrease in the received electric field strength of the signal from the first base station, an increase in transmission power, an increase in the signal interference ratio (SIR) of the second base station, etc.
- SIR signal interference ratio
- Patent Document 1 Special Table 2005-509327
- the bandwidth is not guaranteed for each user. For this reason, even if the radio wave quality is good, communication may be significantly delayed, audio interruptions and audio delays may occur, and the convenience for the user may be significantly reduced.
- the transmission power is weak, so the transmittable area is not very large. Therefore, it is difficult to maintain the communication quality around the transmission area.
- the present invention has been made in view of the problems in the conventional mobile radio communication system as described above, and performs handover without instantaneous interruption, that is, without instantaneous interruption.
- Mobile radio communication system enabling handover, handover in the same system
- An execution method, a radio station in the system, a portable mobile communication terminal apparatus in the system, a program for causing the radio station to execute the handover execution method, and a handover execution method in the portable mobile communication terminal apparatus The purpose is to provide a program to be executed.
- the present invention provides a communication network, a search server connected to the communication network, a plurality of wireless stations connected to the communication network, and a plurality of wireless stations.
- a mobile radio communication system comprising a mobile radio communication terminal device that communicates with one of these radio stations while maintaining a set of uplink and downlink first radio links.
- the mobile mobile communication terminal device transmits a search request to the search server via a wireless station in communication when the downlink received electric field strength is equal to or less than a predetermined value, and the search server At the same time as selecting a new radio station, changing at least one of the uplink transmission operation conditions (UTP) and changing the uplink transmission operation condition (UTP) to the communication To the radio stations inside
- the communicating wireless station changes the uplink reception operation condition (URP) corresponding to the changed uplink transmission operation condition (UTP) notified from the portable mobile communication terminal apparatus, and at the same time, Change at least one of a plurality of transmission operation conditions (DTP) of a link, notify the changed downlink transmission operation condition (DTP) to the portable mobile communication terminal device, and the portable mobile communication terminal device Corresponds to the changed downlink transmission operation condition (DTP) notified from the communicating wireless station until a second wireless link is established with the new wireless station notified from the search server.
- a mobile radio communication system is provided, wherein the first radio link is maintained with the radio station
- the radio station is constituted by an access point having a WLAN (Wireless Local Area Network) function, for example.
- WLAN Wireless Local Area Network
- the portable mobile communication terminal device for example, based on reception field strength, transmission power, and error rate, at least one of the plurality of uplink transmission operation conditions (UTP). Change one.
- a modulation scheme can be selected as at least one of the plurality of uplink transmission operation conditions (UTP).
- UTP uplink transmission operation conditions
- a coding rate can be selected as at least one of the plurality of uplink transmission operation conditions (UTP).
- the first radio link is connected to OFDMA (Orthogonal Frequency Division Multiple
- the number of sub-channels of the OFDMA can be selected.
- the wireless station in communication Upon receipt of the uplink transmission operation condition change notification from the portable mobile communication terminal device, the wireless station in communication is based on the received electric field strength, transmission power and error rate of the wireless station in communication. Preferably, at least one of the downlink transmission operating conditions (DTP) of the communicating radio station is changed.
- DTP downlink transmission operating conditions
- DTP downlink transmission operating conditions
- a coding rate can be selected.
- the number of sub-channels of the OFDMA can be selected.
- the portable mobile communication terminal device When the number of packet collisions exceeds a predetermined value, the portable mobile communication terminal device sends the search request to the search server via the communicating radio station. Can be configured.
- the portable mobile communication terminal apparatus When the propagation delay of a packet exceeds a predetermined value, the portable mobile communication terminal apparatus sends the search request to the search server via the wireless station in communication. Can be configured.
- the portable mobile communication terminal device may be configured to include a plurality of wireless interfaces having different communication methods.
- the portable mobile communication terminal device includes a plurality of wireless terminals including the wireless stations that are communicating with the plurality of wireless interfaces.
- a line station and a plurality of wireless links are set simultaneously, internal interference between the plurality of wireless interfaces is detected, and the operating condition of one of the plurality of wireless interfaces is changed to change the internal interference.
- the portable mobile communication terminal device can be constituted by, for example, a mobile phone device.
- the present invention relates to a communication network, a search server connected to the communication network, a plurality of wireless stations connected to the communication network, and any one of the plurality of wireless stations.
- a mobile mobile communication terminal apparatus that communicates with a station while maintaining a first radio link having a pair of uplink and downlink power, and a handover execution method in a mobile radio communication system that is configured to When the communication terminal device receives the downlink received electric field strength below a predetermined value, the communication terminal device transmits a search request to the search server via the radio station in communication, and sends a new radio station to the search server.
- UDP uplink transmission operation conditions
- the second process of notification and the mobile mobile communication terminal device power The radio station power during communication
- the downlink reception operation condition (DRP) corresponding to the notified downlink transmission operation condition (DTP) notified ) Is changed to maintain the first wireless link with the communicating wireless station, and the portable mobile communication terminal is notified from the search server.
- New radio station The fourth process of setting up the second wireless link between the two and the handover execution method characterized by the power is provided.
- the radio station is constituted by an access point having a WLAN (Wireless Local Area Network) function, for example.
- WLAN Wireless Local Area Network
- At least one of the uplink transmission operation conditions is changed based on the received electric field strength, the transmission power, and the error rate. It is preferable.
- a modulation scheme may be selected.
- a coding rate can be selected as at least one of the uplink transmission operation conditions (UTP).
- UTP uplink transmission operation conditions
- the first radio link is connected to OFDMA (Orthogonal Frequency Division Multiple
- the number of sub-channels of the OFDMA can be selected.
- the wireless station in communication when the wireless station in communication receives the change notification of the uplink transmission operation condition, the received radio field strength of the wireless station in communication, It is preferable to change at least one of the downlink transmission operation conditions (DTP) of the communicating radio station based on the transmission power and the error rate.
- DTP downlink transmission operation conditions
- DTP downlink transmission operation conditions
- a coding rate can be selected.
- the number of sub-channels of the OFDMA can be selected.
- the search is performed via the wireless station in communication.
- the request is sent to the search server.
- the search is performed via the communicating radio station.
- the request is sent to the search server.
- the portable mobile communication terminal device may be configured to include a plurality of wireless interfaces having different communication methods.
- the method includes the portable mobile communication.
- a communication terminal device sets a plurality of radio links and a plurality of radio links simultaneously including the radio stations in communication by the plurality of radio interfaces, detects internal interference between the plurality of radio interfaces, and Preferably, the method further includes a step of changing the operating condition of one of the interfaces to eliminate the internal interference.
- the present invention provides a communication network, a search server connected to the communication network, a plurality of wireless stations connected to the communication network, and any one wireless station of the plurality of wireless stations And a mobile mobile communication terminal device that communicates while maintaining a first radio link having a pair of uplink and downlink power, and the mobile station in the mobile radio communication system, the mobile mobile communication terminal
- the apparatus transmits a search request to the search server via a radio station in communication when the downlink received electric field strength is equal to or lower than a predetermined value, and selects a new radio station to the search server.
- at least one of the plurality of uplink transmission operation conditions (UTP) is changed, and the changed uplink transmission operation condition (UTP) is notified to the communicating radio station.
- the radio station in communication changes the uplink reception operation condition (URP) corresponding to the changed uplink transmission operation condition (UTP) notified from the portable mobile communication terminal.
- URP uplink reception operation condition
- DTP downlink transmission operation condition
- the radio station is constituted by an access point having a WLAN (Wireless Local Area Network) function, for example.
- WLAN Wireless Local Area Network
- the wireless station in communication Upon receiving a notification of a change in the uplink transmission operation condition from the portable mobile communication terminal device, the wireless station in communication is based on the received electric field strength, transmission power, and error rate of the wireless station in communication. Preferably, at least one of the downlink transmission operating conditions (DTP) of the communicating radio station is changed.
- DTP downlink transmission operating conditions
- DTP downlink transmission operating conditions
- a modulation scheme can be selected.
- a coding rate can be selected.
- the number of sub-channels of the OFDMA can be selected.
- the present invention provides a communication network, a search server connected to the communication network, a plurality of wireless stations connected to the communication network, and any one of the plurality of wireless stations
- a mobile mobile communication terminal device that communicates with the first radio link that is a pair of uplink and downlink power, and the mobile mobile communication terminal device in a mobile radio communication system that is configured to
- a search request is transmitted to the search server via the communicating radio station, and the search server starts selecting a new radio station.
- at least one of the plurality of uplink transmission operation conditions (UTP) is changed, the changed uplink transmission operation condition (UTP) is notified to the radio station in communication, and the communication is performed.
- the mobile radio communication terminal device is characterized in that the first radio link is maintained with the radio station in communication.
- the mobile mobile communication terminal device may change at least one of the plurality of uplink transmission operation conditions (UTP) based on received electric field strength, transmission power, and error rate. I like it.
- UTP uplink transmission operation conditions
- a modulation scheme can be selected as at least one of the plurality of uplink transmission operation conditions (UTP).
- UTP uplink transmission operation conditions
- the coding rate can be selected.
- the mobile mobile communication terminal device When the number of packet collisions exceeds a predetermined value, the mobile mobile communication terminal device according to the present invention sends the search request to the search server via the communicating radio station. It is preferable that
- the mobile mobile communication terminal device sends the search request to the search server via the communicating radio station when a packet propagation delay exceeds a predetermined value. It is preferable that
- the portable mobile communication terminal apparatus can be configured to include a plurality of wireless interfaces having different communication methods.
- the mobile mobile communication terminal device simultaneously sets a plurality of radio stations including the radio station in communication with the plurality of radio interfaces and a plurality of radio links, and the plurality of radio interfaces. It is preferable to detect internal interference between the wireless interfaces and change the operating condition of one of the plurality of wireless interfaces to eliminate the internal interference.
- the portable mobile communication terminal device can be constituted by a mobile phone device, for example.
- the present invention provides a communication network, a search server connected to the communication network, a plurality of wireless stations connected to the communication network, and any one of the plurality of wireless stations.
- a portable mobile communication terminal device that communicates with a pair of uplink and downlink power while maintaining a first wireless link, and a computer that configures the wireless station with a handover execution method in a mobile radio communication system configured
- the process performed by the program is performed by the portable mobile communication terminal device via a radio station in communication when the received field strength of the downlink is equal to or lower than a predetermined value.
- the search request is transmitted to the search server, and the search server starts selection of a new radio station, and at the same time, the multiple transmission operation conditions (UTP) of the uplink are used.
- UTP multiple transmission operation conditions
- the communicating wireless station When at least one of these is changed and the changed uplink transmission operation condition (UTP) is notified to the communicating wireless station, the communicating wireless station is connected to the portable mobile communication terminal device.
- the uplink reception operation condition (URP) corresponding to the changed uplink transmission operation condition (UTP) notified is changed, and at the same time, the plurality of downlink transmission operation conditions are changed.
- a program that has a processing power to change at least one of the operation conditions (DTP) and to notify the mobile communication terminal device of the changed downlink transmission operation condition (DTP).
- the present invention relates to a communication network, a search server connected to the communication network, a plurality of wireless stations connected to the communication network, and any one wireless station of the plurality of wireless stations.
- a portable mobile communication terminal apparatus that communicates with the first wireless link that is a pair of uplink and downlink power, and a mobile execution system that performs handover in a mobile radio communication system that is configured
- a program to be executed by a configuring computer, and the processing performed by the program is performed by the search server via a wireless station in communication when the received field strength of the downlink is equal to or lower than a predetermined value.
- the first mobile station is notified of the changed uplink transmission operation condition (UTP) to the communicating wireless station, and the communicating wireless station is notified from the portable mobile communication terminal device.
- the uplink reception operation condition (URP) corresponding to the changed uplink transmission operation condition (UTP) is changed, and at least one of the downlink transmission operation conditions (DTP) is changed.
- the mobile mobile communication terminal device changes the transmission / reception operation conditions until a new radio link is established with the radio station that is the handover destination.
- the wireless link is maintained in cooperation with the wireless station in communication.
- the downlink received electric field strength does not fall below a predetermined value.
- the continuity of communication is guaranteed for as long as possible, and the quality of the radio link can be stabilized. That is, it is guaranteed that the node is executed without interruption.
- FIG. 1 is a conceptual diagram of a mobile radio communication system according to a first embodiment of the present invention.
- FIG. 2 is a block diagram showing a structure of a portable mobile communication terminal device in the mobile radio communication system according to the first embodiment of the present invention.
- FIG. 3 is a block diagram showing an example of a configuration of a control circuit built in a portable mobile communication terminal device in the mobile radio communication system according to the first embodiment of the present invention.
- FIG. 4 is a block diagram showing a structure of a first radio station in the mobile radio communication system according to the first embodiment of the present invention.
- FIG. 5 is a flowchart showing the operation of the control circuit of the portable mobile communication terminal device in the mobile radio communication system according to the first embodiment of the present invention.
- FIG. 6 is a flowchart showing the operation of the control circuit of the first radio station in the mobile radio communication system according to the first embodiment of the present invention.
- FIG. 1 is a conceptual diagram of a mobile radio communication system according to the first embodiment of the present invention.
- the mobile radio communication system includes a communication network 100, a search server 102 connected to the communication network 100, and a plurality of wireless stations connected to the communication network 100 (in FIG. (Only one radio station 103 and second radio station 104 are shown) and any one of the plurality of radio stations and a set of uplink and downlink powers while maintaining the first radio link And a portable mobile communication terminal device 105 for communication.
- the communication network 100 is configured from the Internet, for example.
- the search server 102 includes a database indicating the position of each wireless station.
- the search server 102 receives a search request from the mobile mobile communication terminal device 105, the search server 102 searches the database and performs mobile movement based on the position of the mobile mobile communication terminal device 105 and the direction in which the mobile mobile communication terminal device 105 moves. Identifies a wireless station located in the vicinity of communication terminal device 105.
- the first radio station 103 and the second radio station 104 are configured by a WLAN access point or a mobile communication network base station. In the present embodiment, it is assumed that the first radio station 103 is composed of a WLAN access point, and the second radio station 104 is composed of a WLAN access point or a mobile communication network base station.
- the mobile mobile communication terminal device 105 is composed of, for example, a mobile phone device.
- FIG. 1 shows that the mobile mobile communication terminal device 105 establishes a wireless link with the first wireless station 103 and is communicating with the opposite communication terminal device 106 via the communication network 100. A movement in the direction indicated by A is started, and as a result, the mobile station is approaching the second radio station 104.
- FIG. 2 is a block diagram showing a structure of the portable mobile communication terminal device 105 in the present embodiment.
- the portable mobile communication terminal device 105 includes an OFDMA (Orthogonal Frequency Division Multiple Access) wireless interface 201 and a W-C DMA (Wideband Code Division Multiple Access) wireless interface.
- OFDMA Orthogonal Frequency Division Multiple Access
- W-C DMA Wideband Code Division Multiple Access
- 202, decoder 203, packet decomposition circuit 204, packet assembly circuit 205, encoder 206, measurement circuit 207, codec 208, control circuit 209, error rate measurement circuit 210, packet collision A detection circuit 211, a round-trip propagation delay measurement circuit 212, and an antenna 213 are provided.
- OFDMA Orthogonal Frequency Division Multiple Access
- W-C DMA Wideband Code Division Multiple Access
- the OFDMA wireless interface 201 sets a plurality of subchannels with a wireless station composed of WLAN access points.
- the W-CDMA wireless interface 202 sets a spread spectrum channel with a wireless station including a mobile communication network base station.
- Transmission / reception of a transmission / reception signal between the portable mobile communication terminal device 105 and the opposite communication terminal device 106 is performed via a codec 208 and a W-CDMA wireless interface 202.
- a signal received by the OFDMA wireless interface 201 via the antenna 213 is decoded by the decoder 203, and converted into an original digital signal by the packet decomposition circuit 204.
- User data for transmission is assembled into a packet by the packet assembly circuit 205, encoded by the encoder 206, and then transmitted via the OFDMA radio interface 201 and the antenna 213. .
- FIG. 3 is a block diagram showing an example of the configuration of the control circuit 209.
- the control circuit 209 includes a central processing unit (CPU) 2091, a first memory 2092, a second memory 2093, and an input interface for inputting various instructions and data to the central processing unit 2091. 2094, an output interface 2095 that outputs the result of the processing executed by the central processing unit 2091, a nose 2096 that connects the central processing unit 2091 and other components, and the like.
- CPU central processing unit
- Each of the first and second memories 2092 and 2093 includes a read-only memory (ROM), a random access memory (RAM), a semiconductor memory device such as an IC memory card, a memory such as a flexible disk, etc. It can also be used as a medium, hard disk, or optical magnetic disk.
- the first memory 2092 also has ROM power
- the second memory 2093 has RAM.
- the first memory 2092 stores various control programs and other fixed data to be executed by the central processing unit 2091.
- the second memory 2093 stores various data and parameters and provides an operating area for the central processing unit 2091, i.e., data temporarily required for the central processing unit 2091 to execute the program. To store.
- the central processing unit 2091 reads a program from the first memory 2092 and executes the program. That is, the central processing unit 2091 operates according to a program stored in the first memory 2092.
- the measurement circuit 207 includes a reception electric field strength measurement circuit 221 and a transmission power measurement circuit 222.
- the measurement circuit 207 is connected to the OFDMA wireless interface 201 and the W-CDMA wireless interface 202.
- Received electric field strength measurement circuit 221 measures the received electric field strength, transmits a signal representing the measured received electric field strength to control circuit 209, and transmitted power measuring circuit 222 measures the transmitted power of portable mobile communication terminal device 105. Then, a signal representing the measured transmission power is transmitted to the control circuit 209.
- the error rate measurement circuit 210 is connected to the output of the decoder 203, measures the error rate of the received signal received by the OFDMA radio interface 201, and sends the measured error rate value to the control circuit 209. Send.
- the control circuit 209 is based on the three measured values of the received electric field strength received from the received electric field strength measuring circuit 221, the transmitted power received from the transmitted power measuring circuit 222, and the error rate received from the error rate measuring circuit 210. Then, the quality of the radio link between the portable mobile communication terminal device 105 and the first radio station 103 is determined.
- a signal transmitted from the first mobile station (access point) 103 arrives at the mobile mobile communication terminal device 105 immediately, and a signal transmitted from the mobile mobile communication terminal device 105 is the first radio station. (Access point)
- the control circuit 209 determines that the radio link between the portable mobile communication terminal device 105 and the first radio station 103 is of high quality.
- control circuit 209 changes various transmission conditions (profiles) of portable mobile communication terminal device 105 as will be described later.
- the control circuit 209 transmits a search request packet to the search server 102 via the packet assembly circuit 205, the encoder 206, the OFDMA wireless interface 201, and the antenna 213. .
- control circuit 209 determines the modulation scheme, the number of subchannels, and the coding rate of the uplink based on the above three measured values, and the OFDMA wireless interface 201 and the encoder 206 And the determined uplink operation conditions are transmitted from the packet assembly circuit 205 to the first radio station 103 as a control packet (profile change request).
- first radio station 103 Upon receiving the control packet from portable mobile communication terminal device 105, first radio station 103 is configured to use a downlink modulation scheme based on the above-mentioned three measured values obtained by measuring the side force of first radio station 103 as well. Then, the number of subchannels and the coding rate are determined, and further, the downlink modulation scheme, the number of subchannels and the coding rate are reset to the determined values, and at the same time, the determined operating conditions of the downlink are set to the portable mobile communication terminal device 105. Notify
- the packet collision detection circuit 211 detects a packet collision.
- the packet collision detection circuit 211 is connected to the packet assembly circuit 205 and the packet decomposition circuit 204, and detects the number of times a packet transmitted from the portable mobile communication terminal device 105 collides with another packet on the transmission path. The communication quality other than the above-described wireless link is determined.
- the mobile mobile communication terminal device 105 transmits data so as not to collide with transmissions of other mobile mobile communication terminal devices. Evaluation for quality is low.
- the round-trip propagation delay measuring circuit 212 is connected to the packet assembly circuit 205 and the packet disassembling circuit 204, and the packet transmitted from the portable mobile communication terminal device 105 is received by the opposite communication terminal device 106. The round-trip propagation time until the return packet from the communication terminal device 106 reaches the mobile mobile communication terminal device 105 is measured.
- the measurement result of the round-trip propagation time is transmitted to the control circuit 209, and the control circuit 209 determines whether the measured round-trip propagation time is delayed from the standard round-trip propagation time.
- the communication quality with the opposite communication terminal apparatus 106 is determined.
- the control circuit 209 determines that the communication on the network between the portable mobile communication terminal device 105 and the opposite communication terminal device 106 is high quality as the propagation delay time is shorter, and the lower the propagation delay time is, the lower the propagation delay time is. Judge as quality.
- control circuit 209 compares the number of packet collisions indicated in the signal output from packet collision detection circuit 211 with a predetermined value, and the number of packet collisions is a predetermined value. In the case above, a search request is transmitted to the search server 102. [0096] Control circuit 209 compares the round-trip propagation time indicated in the signal output from round-trip propagation delay measurement circuit 212 with a predetermined value, and the round-trip propagation time is equal to or greater than the predetermined value. Even in the case, the search request is transmitted to the search server 102.
- the measurement circuit 207 further detects the presence of internal interference between the OFDMA wireless interface 201 and the W-CD MA wireless interface 202 when they operate simultaneously to detect internal interference. Then, a signal 207a indicating that internal interference has been detected is transmitted to the control circuit 209.
- the control circuit 209 When receiving the signal 207a indicating that internal interference is detected, the control circuit 209 changes the wireless profile of the W-CDMA wireless interface 202 and stops the internal interference. When the handover is not in progress, the internal interference can be stopped by changing the radio profile of the OFDMA radio interface 201.
- FIG. 4 is a block diagram showing the structure of first radio station 103.
- the first radio station 103 includes an OFDMA radio interface 301, a decoder 302, a network interface 303, an encoder 304, an error rate measurement circuit 305, and a measurement.
- a circuit 306, a control circuit 307, and an antenna 308 are included.
- a signal transmitted from portable mobile communication terminal apparatus 105 is received by OFDMA radio interface 301, input to decoder 302, and decoded by decoder 302.
- the decoded received signal is transmitted to communication network 100 via network interface 303 and transmitted to opposite communication terminal apparatus 106 via communication network 100.
- a signal transmitted from the opposite communication terminal device 106 is input to the network interface 303 via the communication network 100 and is encoded by the encoder 304. Next, it is transmitted from the OFD MA wireless interface 301 to the portable mobile communication terminal device 105.
- the error rate measurement circuit 305 is connected to the output side of the decoder 302, measures the error rate of the signal transmitted from the portable mobile communication terminal device 105, and outputs the measurement result. Notify the control circuit 307.
- the measurement circuit 306 includes a reception field strength measurement circuit 311 and a transmission power measurement circuit 312.
- the measurement circuit 306 is connected to an OFDMA wireless interface 301.
- the reception field strength measurement circuit 311 measures the reception field strength, transmits a signal representing the measured reception field strength to the control circuit 307
- the transmission power measurement circuit 312 measures the transmission power of the first radio station 103
- a signal representing the measured transmission power is transmitted to the control circuit 307.
- Control circuit 307 has the same structure as control circuit 209 of portable mobile communication terminal apparatus 105 shown in FIG. That is, the central processing unit in the control circuit 307 reads the program with the first memory force and executes the program. That is, the central processing unit in the control circuit 307 operates according to the program stored in the first memory.
- control circuit 307 When the control circuit 307 receives the search request from the portable mobile communication terminal device 105, the control circuit 307 transmits a search request packet to the search server 102 via the network interface 303, and sends the response as AP (access point) designation data. As received.
- AP access point
- control circuit 307 when the control circuit 307 receives a profile change request from the portable mobile communication terminal device 105, the control circuit 307 uses the modulation scheme based on the received electric field strength, the transmission power, and the error rate of the received signal in the first radio station 103. Then, the number of subchannels and the coding rate are determined, and related devices are reset to these values, and at the same time, the mobile mobile communication terminal device 105 is notified.
- FIG. 5 shows a portable mobile communication terminal apparatus 1 in the mobile radio communication system according to this embodiment.
- FIG. 5 is a flowchart showing the operation of a control circuit 209 of 05.
- control circuit 209 of the portable mobile communication terminal device 105 in the present embodiment will be described.
- the portable mobile communication terminal device 105 uses an OFDMA wireless interface 201, and a wireless link is set up with the first wireless station 103 consisting of a WLAN access point. Assume that.
- control circuit 209 receives the received electric field strength of the signal transmitted from the first radio station 103. It is determined whether or not the force is below a predetermined value (step 401).
- control circuit 209 requests search server 102 to perform a search request. Send the packet (step 402).
- the control circuit 209 receives values representing the downlink received field strength and uplink transmission power from the measurement circuit 207 and values representing the downlink error rate from the error rate measurement circuit 210, and performs mobile mobile communication.
- An uplink transmission side profile (UTP) (modulation method, number of transmission subchannels, uplink coding rate) representing a plurality of uplink transmission operation conditions of the terminal device 105 is determined (step 403).
- the control circuit 209 uses the mobile radio communication terminal device 105 as an uplink reception side profile (URP) change request message in the first radio station 103.
- URP uplink reception side profile
- the contents of the change of the uplink transmission side profile (UT P) determined by is transmitted to the first radio station 103 (step 404).
- control circuit 209 receives a downlink reception side profile (DRP) change request message from the first radio station 103 (step 405).
- DRP downlink reception side profile
- control circuit 209 based on the previously determined uplink transmission side profile (UTP) and the downlink reception profile (DRP) received from the first radio station 103, the mobile mobile communication terminal device 105 The modulation scheme, demodulation scheme, number of transmission subchannels, number of reception subchannels, and coding rate are changed (step 406).
- the signal reach can be increased.
- control circuit 209 obtains a list of candidate radio stations from the search server 102, and The most suitable candidate station is selected (step 407).
- the control circuit 209 determines whether or not the selected radio station is a base station of the mobile communication network (step 408). In other words, it is determined whether the selected radio station is a mobile communication network base station or a radio access point.
- the control circuit 209 uses the OFDMA radio interface 201 currently in use to newly select the base station.
- a wireless link is set between and the address of the opposite communication terminal device 106 is notified to the newly selected base station (step 412).
- control circuit 209 opens the old radio link (step 413).
- control circuit 209 performs the steps after step 401 again.
- the control circuit 209 uses the W-CDMA radio interface 202 to select the newly selected base station.
- a radio link is set up with the station, and the address of the opposite communication terminal device 106 is notified to the newly selected base station (step 409).
- control circuit 209 determines the presence or absence of internal interference between the OFDMA radio interface 201 and the W—CDMA radio interface 202 based on the signal 207a from the measurement circuit 207 (step). 410).
- control circuit 209 opens the old radio link (step 413).
- control circuit 209 prevents the internal interference by changing the wireless profile of the W-CDMA wireless interface 202 (step 411).
- control circuit 209 opens the old radio link (step 413).
- control circuit 209 performs the above-described steps after step 401 again.
- control circuit 209 When the received electric field strength of the signal transmitted from first radio station 103 exceeds a predetermined value (NO in step 401), control circuit 209 provides a packet collision detection circuit. Whether the number of packet collisions indicated by the signal transmitted from 211 exceeds a predetermined value is determined (step 421). If the number of packet collisions exceeds a predetermined value (YES in step 421), the control circuit 209 transmits a search request to the search server 102 (step 423).
- control circuit 209 determines a new radio station by executing the steps after step 407, and sets a new radio link with this new radio station (step 407 —413). ).
- control circuit 209 When the number of packet collisions is equal to or smaller than a predetermined value (N0 in Step 421), the control circuit 209 returns the round-trip packet determined based on the signal from the round-trip propagation delay measurement circuit 212. It is determined whether or not the propagation delay exceeds a predetermined value (step 422).
- control circuit 209 transmits a search request to the search server 102 (step 423).
- control circuit 209 performs the above-described steps after step 401 again.
- FIG. 6 is a flowchart showing the operation of the control circuit 307 of the first radio station 103.
- control circuit 307 of the first radio station 103 will be described with reference to FIG.
- the control circuit 307 of the first radio station 103 constantly monitors whether or not an At Printer response (URP) change request message (step 404 in FIG. 4) has been received from the mobile mobile communication terminal device 105. (Step 501).
- URP At Printer response
- control circuit 307 measures uplink received electric field strength and downlink transmission power. Obtained from the received electric field strength measuring circuit 311 and the transmitted power measuring circuit 312 of the circuit 306 respectively, and the uplink error rate from the error rate measuring circuit 305. Next, the control circuit 307 determines a downlink transmission profile (DTPX modulation scheme, number of transmission subchannels, coding rate) based on these values.
- DTPX modulation scheme number of transmission subchannels, coding rate
- control circuit 307 transmits the downlink transmission profile (DTP) to the portable mobile communication terminal device 105 as a downlink reception profile (DRP) change request (step 503).
- DTP downlink transmission profile
- DRP downlink reception profile
- the control circuit 307 sets the mobile mobile communication terminal device 105.
- the modulation scheme, demodulation scheme, number of transmission subchannels, number of reception subchannels, and uplink coding rate are changed (step 504).
- control circuit 307 repeats the steps after step 501 described above.
- the control circuit 307 searches from the portable mobile communication terminal device 105. It is determined whether or not the request has been received (step 511).
- control circuit 307 transfers the received search request to search server 102 (step 512).
- control circuit 307 repeatedly performs the steps after step 501 described above.
- a wireless station receives a wireless station candidate list from the search server 102, the wireless station is a second wireless station consisting of a handover destination wireless access point or a mobile wireless communication network base station. 104.
- the first wireless station 103 receives the search request from the portable mobile communication terminal device 105, and so on (NO in step 511).
- steps 521 to 524 are executed by the second radio station 104.
- the second radio station 104 determines whether or not a candidate list of radio stations has been received from the search server 102 (step 521).
- the second radio station 104 sets a radio link to the portable mobile communication terminal device 105, and transmits a candidate list of radio stations to the portable mobile communication terminal device 105 (step 522).
- the second radio station 104 is changed from the portable mobile communication terminal device 105 to the opposite communication terminal device.
- the address of 106 is received (step 523).
- the second radio station 104 is opposed via the communication network 100 based on this address.
- a radio link is set for communication terminal apparatus 106 (step 524).
- control circuit 307 repeatedly performs the steps after step 501 described above.
- the portable mobile communication terminal device 105 receives the first radio station 103 when the received electric field strength is equal to or less than a predetermined value.
- the plurality of transmission conditions (profiles) are changed based on a plurality of operation parameters, and the changed first profile is notified to the first radio station 103 that is communicating.
- the mobile mobile communication terminal device 105 transmits a search request to the search server 102 via the first radio station 103 and requests a search for a new radio station.
- the search server 102 searches the database, selects the second radio station 104 as a new radio station based on the current position of the portable mobile communication terminal device 105, and identifies the new radio station identification number. Is notified to the portable mobile communication terminal device 105 via the first radio station 103.
- the portable mobile communication terminal device 105 starts handover, sets up a radio link with the second radio station 104, and further sets the address of the opposite communication terminal device 106 to the first address.
- the second radio station 104 is notified.
- the second radio station 104 sets a radio link to the opposing communication terminal apparatus 106 via the communication network 100. Thereby, the handover from the first radio station 103 to the second radio station 104 is completed.
- the portable mobile communication terminal device 105 establishes a new radio link with the second radio station 104 that is the handover destination. Until the setting is made, the wireless link in communication with the first wireless station 103 is maintained in cooperation, so that the received field strength of the downlink is as low as possible from a predetermined value. Communication continuity is guaranteed for a long time, and the quality of the radio link can be stabilized. That is, handover is executed without interruption.
- the present invention provides a handover technology that is optimal for a system that integrates mobile mobile communication technology and IP (Internet Protocol) technology.
- the present invention uses OFDMA and W-CDMA wireless interfaces to enable handover between different systems.
- the present invention can be applied to handover between WLA N and W-CDMA, and further handover between WiMAX, Bno tooth, iBurst, wireless USB, etc. and a conventional cellular system. Can do.
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- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/300,147 US8077674B2 (en) | 2006-05-09 | 2007-04-26 | Mobile wireless communication system and method of carrying out handover in the system |
JP2008514443A JP5051128B2 (ja) | 2006-05-09 | 2007-04-26 | 移動無線通信システム及び同システムにおけるハンドオーバー実行方法 |
EP07742505.6A EP2031886A4 (en) | 2006-05-09 | 2007-04-26 | MOBILE COMMUNICATION SYSTEM AND HANDOVER EXECUTION METHOD IN IT |
CN2007800167934A CN101444126B (zh) | 2006-05-09 | 2007-04-26 | 移动无线通信***和***中执行切换的方法 |
US13/269,644 US20120026983A1 (en) | 2006-05-09 | 2011-10-10 | Mobile wireless communication system and method of carrying out handover in the system |
Applications Claiming Priority (2)
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JP2006-130900 | 2006-05-09 | ||
JP2006130900 | 2006-05-09 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/269,644 Continuation US20120026983A1 (en) | 2006-05-09 | 2011-10-10 | Mobile wireless communication system and method of carrying out handover in the system |
Publications (1)
Publication Number | Publication Date |
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WO2007129595A1 true WO2007129595A1 (ja) | 2007-11-15 |
Family
ID=38667702
Family Applications (1)
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PCT/JP2007/059070 WO2007129595A1 (ja) | 2006-05-09 | 2007-04-26 | 移動無線通信システム及び同システムにおけるハンドオーバー実行方法 |
Country Status (5)
Country | Link |
---|---|
US (2) | US8077674B2 (ja) |
EP (1) | EP2031886A4 (ja) |
JP (1) | JP5051128B2 (ja) |
CN (1) | CN101444126B (ja) |
WO (1) | WO2007129595A1 (ja) |
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Also Published As
Publication number | Publication date |
---|---|
US20120026983A1 (en) | 2012-02-02 |
US20100238897A1 (en) | 2010-09-23 |
CN101444126B (zh) | 2011-08-31 |
JPWO2007129595A1 (ja) | 2009-09-17 |
EP2031886A4 (en) | 2013-10-30 |
EP2031886A1 (en) | 2009-03-04 |
CN101444126A (zh) | 2009-05-27 |
JP5051128B2 (ja) | 2012-10-17 |
US8077674B2 (en) | 2011-12-13 |
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