WO2007072936A1

WO2007072936A1 - Mobile terminal, communication control device, and communication method

Info

Publication number: WO2007072936A1
Application number: PCT/JP2006/325561
Authority: WO
Inventors: Yuji Kakuda
Original assignee: Kyocera Corporation
Priority date: 2005-12-22
Filing date: 2006-12-21
Publication date: 2007-06-28
Also published as: JP4832076B2; JP2007174344A

Abstract

Provided is a mobile terminal transmitting/receiving data divided into a plurality of carriers and allocated to/from a base station by using a plurality of carriers. The mobile terminal includes: a monitor unit for monitoring a communication state in each carrier; a judging unit to judge whether a difference between a communication state of degraded carrier of the worst communication state and a communication state of other carriers among the plurality of carriers is equal to or greater than a threshold value; and a communication unit for requesting the base station using the degraded carrier to disconnect the degraded carrier if the judging unit judges that the difference between the degraded carrier communication state and other carrier communication state exceeds the threshold value.

Description

Specification

Mobile terminal, communication control apparatus, and communication method

Technical field

TECHNICAL FIELD [0001] The present invention relates to a mobile terminal, a communication control device, and a communication method that perform data communication using a plurality of carriers.

Background art

[0002] In mobile communication networks using code division multiple access (CDMA), lxEV-DO (lx evolution-data only) that provides high-speed data communication is provided (for example, JP 2002-300644). Gazette (page 2-3, Fig. 1)).

[0003] In lxEV-DO, one carrier is assigned to one user (mobile terminal). In addition, the introduction of so-called “multi-carrier” (nxEV-DO) in which a plurality of carriers (for example, three carriers) are allocated to one user is also being studied. Multi-carrier (nxEV-DO) realizes faster data communication than lxEV-DO.

[0004] In multicarrier, a transmission side apparatus divides data, assigns it to a plurality of carriers, and transmits the assigned data. On the other hand, the receiving side apparatus combines data received via a plurality of carriers. Thereby, the multi-carrier realizes high-speed data communication. Disclosure of the invention

However, in multicarrier, even if one carrier can secure a sufficient band, another carrier cannot always secure a sufficient band. In other words, even if it is possible to communicate in a good communication state with a certain carrier, communication with a poor communication state may be forced on another carrier.

[0006] In multi-carrier, data is divided and assigned to a plurality of carriers, so that the data power assigned to a carrier in a poor communication state is delayed compared to data assigned to a carrier in another good communication state There is a problem.

[0007] In particular, data that requires high quality of service (QoS), such as streaming, IP phone, or IP video phone, that is, data that is severe in delay becomes a big problem. Specifically, in multicarrier, if data is extremely delayed in a certain carrier, the receiving side A device cannot receive data on other carriers without delay, but cannot combine the data. Therefore, the receiving side apparatus has a problem that the waiting time for combining the data becomes long and the video and audio cannot be reproduced smoothly.

[0008] Therefore, the present invention has been made in view of the above points, and in a multicarrier in which data is divided and assigned to a plurality of carriers, data is delayed by a carrier whose communication state is extremely deteriorated. It is an object of the present invention to provide a mobile terminal, a communication control apparatus, and a communication method that can prevent this.

[0009] In order to achieve the above object, the first feature of the invention is that the data is divided and allocated to a plurality of carriers, and the data is transmitted to and received from a base station using the plurality of carriers. A monitoring unit that monitors a communication state in each carrier and a difference between a communication state of a deteriorated carrier having the most deteriorated communication state and a communication state of another carrier among the plurality of carriers is a threshold value When the determination unit determines whether or not the power is above and the determination unit determines that the difference is equal to or greater than the threshold, the deteriorated carrier is disconnected from the base station using the deteriorated carrier. The gist is that the mobile terminal has a notification unit for notification.

[0010] According to the powerful feature, the mobile terminal can detect a carrier whose communication state is extremely deteriorated among a plurality of carriers that transmit and receive data. The mobile terminal can prevent data from being delayed by causing the base station to disconnect the carrier whose communication state has been extremely deteriorated.

[0011] In the first aspect of the present invention, the communication state is a downlink throughput of lower data transmitted by each carrier, and the deteriorated carrier may be a carrier having the lowest downlink throughput.ヽ.

[0012] According to the strong feature, the mobile terminal can estimate that the downlink communication state is deteriorated in a carrier having a low downlink throughput of downlink data transmitted by each carrier. Then, the mobile terminal can detect a carrier with extremely low downlink throughput, and can prevent the data from being delayed by causing the base station to disconnect the detected carrier.

In the first feature of the present invention, the communication state may be a transmission power of each carrier, and the deteriorated carrier may be a carrier having the highest transmission power. [0014] According to the strong feature, the mobile terminal can estimate that the uplink communication state is deteriorated in a carrier having a high transmission power of each carrier. Then, the mobile terminal can prevent data from being delayed by detecting a carrier with extremely high transmission power and causing the base station to disconnect the detected carrier.

[0015] A second feature of the present invention is a communication control apparatus in which data is divided and assigned to a plurality of carriers, and the data is transmitted to and received from a mobile terminal using the plurality of carriers. A monitoring unit that monitors a communication state in the network, and determines whether or not a difference between a communication state of a deteriorated carrier having the most deteriorated communication state and a communication state of another carrier among the plurality of carriers is equal to or greater than a threshold value And a carrier control unit that disconnects the deteriorated carrier when the determination unit determines that the difference is equal to or greater than the threshold value.

[0016] According to the powerful feature, the communication control apparatus can detect a carrier whose communication state is extremely deteriorated among a plurality of carriers that transmit and receive data. The communication control device can prevent data from being delayed by disconnecting a carrier whose communication state has been extremely deteriorated.

[0017] In the second aspect of the present invention, the communication control device further includes a receiving unit that receives a downlink data communication rate of each carrier predicted based on a reception state of each carrier in the mobile terminal. The communication state may be the downlink data communication speed of each carrier, and the deteriorated carrier may be a carrier having the lowest downlink data communication speed.

[0018] According to the powerful feature, the communication control device has a low downlink data communication speed predicted for each carrier based on the reception state of each carrier in the mobile terminal, and the downlink data transmission rate for each carrier is low. It can be estimated that the communication state has deteriorated. The communication control apparatus can prevent data from being delayed by detecting a carrier having an extremely low downlink data communication speed and disconnecting the detected carrier.

[0019] In the second aspect of the present invention, the communication state is an uplink throughput of data transmitted by each carrier, and the deteriorated carrier may be the carrier having the lowest uplink throughput.ヽ.

[0020] According to an advantageous feature, the communication control apparatus transmits the uplink data transmitted by each carrier. It can be estimated that the uplink communication state has deteriorated in a carrier with low uplink throughput. Then, the communication control apparatus can prevent data from being delayed by detecting a carrier with extremely low uplink throughput and disconnecting the detected carrier.

[0021] A third feature of the present invention is a communication method in which data is divided and assigned to a plurality of carriers, and the data is transmitted and received between a mobile terminal and a communication control device using the plurality of carriers. The difference between the step of monitoring the communication state in each carrier and the communication state of the deteriorated carrier having the most deteriorated communication state among the plurality of carriers and the communication state of other carriers is equal to or greater than a threshold value. The gist of the present invention is a communication method including a step of determining whether or not there is a certain force and a step of cutting off the deteriorated carrier when the difference is determined to be equal to or greater than the threshold.

[0022] In the third aspect of the present invention, the communication state is a downlink throughput of lower data transmitted by each carrier, and the deteriorated carrier may be a carrier having the lowest downlink throughput.ヽ.

[0023] In the third aspect of the present invention, the communication state may be a transmission power of each carrier in the mobile terminal, and the deteriorated carrier may be a carrier having the highest transmission power.

[0024] In the third aspect of the present invention, the communication control device further includes a step of receiving a downlink data communication rate of each carrier predicted based on a reception state of each carrier in the mobile terminal. The communication state is the downlink data communication speed of each carrier, and the deteriorated carrier may be the carrier having the lowest downlink data communication speed.

[0025] In the third aspect of the present invention, the communication state is an uplink throughput of data transmitted by each carrier, and the deteriorated carrier may be the carrier having the lowest uplink throughput.ヽ.

[0026] As described above, according to the present invention, in a multicarrier in which data is divided and assigned to a plurality of carriers, a movement that can prevent data from being delayed by a carrier whose communication state has been extremely deteriorated is prevented. A terminal, a communication control device, and a communication method can be provided.

Brief Description of Drawings

FIG. 1 is an overall schematic diagram of a communication system according to a first embodiment of the present invention. FIG. 2 is a diagram showing a downlink packet flow in the mobile communication system according to the first embodiment of the present invention.

FIG. 3 is a diagram showing an uplink packet flow in the mobile communication system according to the first embodiment of the present invention.

FIG. 4 is a functional block diagram of a mobile terminal according to the first embodiment of the present invention.

FIG. 5 is a carrier connection sequence between a mobile terminal and a base station in the mobile communication system according to the first embodiment of the present invention.

FIG. 6 is a terminal-led carrier disconnection sequence in the communication system according to the first embodiment of the present invention.

FIG. 7 is a functional block diagram of a base station according to the second embodiment of the present invention.

FIG. 8 is a base station initiated carrier disconnection sequence in the mobile communication system according to the second embodiment of the present invention. (pattern 1)

FIG. 9 is a base station initiated carrier disconnection sequence in the mobile communication system according to the second embodiment of the present invention. (Pattern 2)

FIG. 10 is a diagram for explaining data delay in a conventional mobile communication system.

FIG. 11 is a diagram for explaining a data delay prevention effect in the communication system according to the first and second embodiments of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

Next, an embodiment of the present invention will be described. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals.

[First Embodiment]

In the present embodiment, a mobile communication system that disconnects a carrier whose communication state has been extremely deteriorated under the initiative of a mobile terminal will be described. Here, the mobile terminal may be a mobile phone, a wireless module, a card terminal, or the like.

[0030] (Overall schematic configuration of mobile communication system)

FIG. 1 is an overall schematic configuration diagram of a mobile communication system including a mobile terminal according to the present embodiment. [0031] The mobile communication system 10 provides high-speed data communication (nxEV-DO) by multicarrier using a plurality of carriers.

[0032] The mobile communication system 10 includes a mobile terminal 100, a plurality of base stations 200 (base stations 200A to 200C), a base station "1" control device 300, a knock IJ control device 400, It is composed of a base station 500, a net hook 600, and carriers C1 to C3 that connect the mobile terminal 100 and base stations 200A to 200C. The numbers of mobile terminals, base stations, and carriers included in the mobile communication system 10 are not limited to the quantities shown in FIG.

In FIG. 1, one base station 200 may be connected to a plurality of carriers in which one base station 200 is connected to one carrier. That is, carriers C1 to C3 may all be connected to base station 200A. Carriers C1 and C2 may be connected to base station 200A and carrier C3 may be connected to base station 200B.

In mobile communication system 10, data between mobile terminal 100 and base station 200 is divided and assigned to a plurality of carriers (carriers C1 to C3 in FIG. 1). The mobile terminal 100 and the base station 200 transmit or receive the data (packet) using the plurality of carriers.

[0035] Specifically, in the mobile communication system 10, downlink data is transmitted as shown in FIG. FIG. 2 is a diagram showing a flow of downlink data in the mobile communication system 10.

As shown in FIG. 2, the packet control device 400 receives downlink data from the network 600 via the relay station 500 ((1)), and divides the downlink data via the base station control device 300.

((2), (3), (4)), the divided data is allocated to the carriers C1 to C3.

[0037] Base stations 200A to 200C transmit the downlink data to mobile terminal 100 using carriers C1 to C3, respectively ((5), (6), and (7)).

[0038] Mobile terminal 100 combines downlink data transmitted by carriers C1 to C3.

[0039] Also, in the mobile communication system 10, uplink data is transmitted as shown in FIG. Figure

FIG. 3 is a diagram showing the flow of uplink data in the mobile communication system 10.

[0040] As shown in FIG. 3, mobile terminal 100 divides uplink data ((1), (2), (3)), assigns the divided data to carriers C1 to C3, and assigns the data after the assignment. Base station 200A ~ 200

Send to C. [0041] The base stations 200A to 200C receive the uplink data transmitted by the carriers C1 to C3, and transmit the uplink data to the base station controller 300 ((4), (5), (6)) .

[0042] The packet control device 400 combines the uplink data received via the base station control device 300 ((7)), and transmits the combined uplink data to the network 600 via the relay station 500.

Here, the packet control device 400 is connected to the base station control device 300 and the relay station 500, but is not limited to being connected to the base station control device 300 and the relay station 500.

[0044] (Functional block configuration of mobile terminal)

A functional block configuration of the mobile terminal 100 will be described with reference to FIG.

[0045] In the following, portions related to the present invention will be mainly described. Therefore, it has been noted that the mobile terminal 100 may be provided with a function block (such as a power supply unit) that is not shown in the figure or omitted in the description, which is essential for realizing the function as the device!

FIG. 4 is a functional block configuration diagram of the mobile terminal 100.

As shown in FIG. 4, mobile terminal 100 includes transmission / reception unit 110, monitoring unit 120, determination unit 130,

The carrier control unit 140 and the packet communication unit 150 are provided.

[0048] Transmission / reception section 110 transmits data assigned to a plurality of carriers in packet communication section 150, which will be described later, to base station 200 using the plurality of carriers.

[0049] The transmission / reception unit 110 receives downlink data respectively transmitted by a plurality of carriers.

[0050] The monitoring unit 120 monitors the communication state of each carrier assigned to the mobile terminal 100.

[0051] The monitoring unit 120 may monitor the downlink throughput of downlink data transmitted by each carrier as the communication state of each carrier in the downlink direction.

[0052] Monitoring section 120 may monitor the transmission power of each carrier as the communication state of each carrier in the uplink direction.

[0053] The determination unit 130 determines the communication state of the carrier (degraded carrier) with the most deteriorated communication state among the plurality of carriers whose communication state is monitored by the monitoring unit 120, and the communication state of other carriers. It is determined whether or not the difference is greater than or equal to a threshold value.

[0054] The determination unit 130 includes a plurality of carriers whose downlink throughput is monitored by the monitoring unit 120. Of these, the carrier having the lowest downlink throughput is defined as a deteriorated carrier, and it may be determined whether the difference between the downlink throughput of the deteriorated carrier and the downlink throughput of another carrier is equal to or greater than a threshold value.

[0055] Alternatively, the determination unit 130 sets a carrier having the highest transmission power among the plurality of carriers whose transmission power is monitored by the monitoring unit 120 as a deteriorated carrier, and transmits the transmission power of the deteriorated carrier and other carriers. You can determine whether the difference from the transmission power is greater than or equal to the threshold! /.

[0056] When the above-described difference is equal to or greater than the threshold value, determination unit 130 instructs carrier control unit 140 to disconnect the deteriorated carrier.

Carrier control section 140 requests base station 200 to connect or disconnect a carrier.

[0058] Specifically, when the determination unit 130 instructs the carrier control unit 140 to cut the above-described deteriorated carrier, the carrier control unit 140 disconnects the carrier from the base station that uses the deteriorated carrier. Notify you.

[0059] The packet communication unit 150 combines downlink data transmitted by a plurality of carriers.

[0060] The packet communication unit 150 divides the uplink data and assigns it to a plurality of carriers.

[0061] (Operation of mobile communication system)

Next, the operation of the mobile communication system 10 described above will be described with reference to FIGS. Specifically, an operation (1) in which the mobile terminal 100 is connected to the base stations 200A to 200C and an operation (2) in which a carrier whose communication state is extremely deteriorated are disconnected by the mobile terminal 100 are described.

[0062] (1) Carrier connection sequence

FIG. 5 is a sequence diagram when mobile terminal 100 connects carriers to base stations 200A to 200C, respectively.

[0063] As shown in FIG. 5, in step S101, the mobile terminal 100 transmits a ConnectionReq message requesting connection to the base station 200A.

[0064] In step S102, base station 200A transmits an Ack message permitting data communication with base station 200A to mobile terminal 100.

In step S 103, base station 200 A transmits a T-CH Assignment message for assigning a traffic channel (T-CH) to mobile terminal 100. [0066] In step S104, terminal authentication Z user authentication or the like of mobile terminal 100 is performed.

[0067] In step S105, the base station 200A and the mobile terminal 100 execute communication setting, and start data (packet) communication using the set carrier C1.

[0068] In step S106 to step S109, the mobile terminal 100 connects the carrier C2 with the base station 200B in the same manner as the connection step with the base station 200A described above.

[0069] In step S110 to step S113, the mobile terminal 100 connects the carrier C3 with the base station 200C in the same manner as the connection step with the base station 200A.

[0070] (2) Carrier disconnection sequence (terminal initiative)

FIG. 6 is a sequence diagram in which a carrier whose communication state is extremely deteriorated is disconnected on the initiative of the mobile terminal 100.

[0071] In step S201 to step S203, the mobile terminal 100 connects the base stations 200A to 200C with the carriers C1 to C3, respectively, and performs data (packet) communication.

[0072] In step S204, the carrier between carrier terminal 100 and base station 200C (carrier C

In 3), the communication state deteriorates. That is, the communication state of the carrier C3 is most deteriorated among the carriers C1 to C3 monitored by the mobile terminal 100.

[0073] Note that the communication states of the carriers C1 to C3 may be the downlink throughput of downlink data transmitted by each carrier. In such a case, it is assumed that the downlink throughput transmitted by the carrier C3 is the lowest.

[0074] Alternatively, the communication states of carriers C1 to C3 may be the transmission power of each carrier in mobile terminal 100. In such a case, it is assumed that the transmission power of carrier C3 is the highest.

[0075] In step S205, the mobile terminal 100 detects the extreme deterioration of the communication state described above in the carrier C3.

[0076] Specifically, the mobile terminal 100 determines whether or not the difference between the communication state of the carrier C3 with the most deteriorated communication state and the communication states of the other carriers C1 and C2 is greater than or equal to a threshold value. To do. If the difference is greater than or equal to the threshold, the mobile terminal 100 considers that the communication state of the carrier C3 has deteriorated extremely.

[0077] In such a case, the mobile terminal 100 determines to disconnect the carrier C3 in order to prevent the data from being delayed by the carrier C3. [0078] In step S206, the mobile terminal 100 transmits a Connection Close message requesting to disconnect the carrier C3 to the base station 200C.

[0079] In step S207, the base station 200C receives the Connection Close message from the mobile terminal 100 and disconnects the carrier C3.

[0080] In steps S208 and S209, the mobile terminal 100 performs data (packet) communication only with the carriers C1 and C2 with the base stations 200A and 200B.

[0081] (Action 'effect)

According to the present embodiment, the mobile terminal 100 includes a plurality of carriers that transmit and receive data.

It is possible to detect a carrier whose communication state is extremely deteriorated. Then, the mobile terminal 100 can prevent the data from being delayed by causing the base station 200 to disconnect the carrier whose communication state has been extremely deteriorated.

[0082] According to the present embodiment, the mobile terminal 100 can estimate that the downlink communication state has deteriorated in a carrier having a low downlink throughput of downlink data transmitted by each carrier. Then, the mobile terminal 100 detects a carrier with extremely low downlink throughput.

By causing the base station 200 to disconnect the detected carrier, it is possible to prevent data from being delayed.

[0083] According to the present embodiment, the mobile terminal 100 can estimate that the uplink communication state is deteriorated in a carrier having a high transmission power of each carrier. Then, the mobile terminal 100 can prevent the data from being delayed by detecting a carrier with extremely high transmission power and causing the base station 200 to disconnect the carrier.

[Second Embodiment]

In the present embodiment, a mobile communication system that disconnects a carrier whose communication state has been extremely deteriorated under the initiative of a communication control device will be described. Here, the communication control apparatus may be a base station or a base station control apparatus.

Hereinafter, the difference between the mobile communication system according to the present embodiment and the mobile communication system according to the first embodiment will be mainly described.

[0086] (Function block configuration of base station (communication control device))

FIG. 7 is a functional block configuration diagram of base station 200. The base stations 200A to 200C All have the same functional block configuration.

As shown in FIG. 7, base station 200 includes transmission / reception section 210, monitoring section 220, determination section 230, carrier control section 240, and packet communication section 250.

[0088] Transmission / reception section 210 transmits data allocated to a plurality of carriers in packet communication section 250, which will be described later, to mobile terminal 100 using the plurality of carriers.

[0089] The transmission / reception unit 210 receives uplink data respectively transmitted by a plurality of carriers.

[0090] Transmission / reception section 210 receives the downlink data communication rate (DRC value: Data Rate Control) of each carrier predicted based on the reception state of each carrier in mobile terminal 100.

[0091] Monitoring section 220 monitors the communication state of each carrier assigned to mobile terminal 100.

The monitoring unit 220 may monitor the downlink data communication speed (DRC value) of each carrier received by the transmission / reception unit 210 as the communication state of each carrier in the downlink direction.

Alternatively, the monitoring unit 220 may monitor the uplink throughput of uplink data transmitted by each carrier as the communication state of each carrier in the uplink direction.

[0094] Determining unit 230 determines the communication state of the carrier (degraded carrier) with the most deteriorated communication state among the plurality of carriers whose communication state is monitored by monitoring unit 220, and the communication state of other carriers. It is determined whether or not the difference is greater than or equal to a threshold value.

[0095] Among the plurality of carriers whose downlink data communication speed (DRC value) is monitored by the monitoring unit 120, the determination unit 230 sets the carrier having the lowest downlink data communication speed (DRC value) as a degraded carrier. It may be determined whether or not the difference between the downlink data communication speed (DRC value) of the deteriorated carrier and the downlink data communication speed (DRC value) of another carrier is greater than or equal to a threshold value.

Alternatively, the determination unit 230 sets a carrier having the lowest uplink throughput as a deteriorated carrier among a plurality of carriers whose uplink throughput is monitored by the monitoring unit 220, and determines the uplink throughput of the deteriorated carrier and other carriers. You can judge whether the difference from the uplink throughput of the carrier is more than the threshold! /.

[0097] When the above-described difference is equal to or greater than the threshold value, determination unit 230 instructs carrier control unit 240 to disconnect the deteriorated carrier. [0098] Carrier control section 240 performs control for connecting or disconnecting a carrier with mobile terminal 100.

[0099] Specifically, when the determination unit 230 instructs the carrier control unit 240 to cut the above-described deteriorated carrier, the carrier control unit 240 disconnects the carrier from the base station using the deteriorated carrier. To do.

[0100] The packet communication unit 250 allocates data received from the base station control apparatus 300 and divided for a plurality of channels to a plurality of carriers.

[0101] The packet communication unit 250 relays the uplink data received via the plurality of channels to the base station control device 300.

[0102] (Operation of mobile communication system)

Next, the operation of the mobile communication system 10 according to the present embodiment will be described with reference to FIG. 8 to FIG.

[0103] (1) Carrier disconnection sequence (communication control device led 1)

FIG. 8 is a sequence diagram in which a carrier whose communication state is extremely deteriorated is disconnected under the initiative of the base station 200 (communication control device).

[0104] In step S301, the mobile terminal 100 connects the base station 200A and the carrier C1, and performs data (packet) communication.

In steps S302 to S303, mobile terminal 100 connects base station 200C and carriers C2 and C3 to perform data (packet) communication. Here, mobile terminal 100 does not connect a carrier to base station 200B. In this embodiment, the carrier disconnection sequence is such that the mobile terminal 100 has one base station (base station 200C) and a plurality of carriers (carrier C2,

It shall be applied when connected in C3).

[0106] In step S304, the carrier between carrier terminal 100 and base station 200C (carrier C

In 3), the communication state deteriorates. That is, among the carriers C1 to C3 monitored by the mobile terminal 100, the communication state of the carrier C3 is most deteriorated.

[0107] Note that the communication state of carriers C1 to C3 may be the downlink data communication speed (DRC value) of each carrier as described above. In such a case, the downlink data transmission speed of carrier C3 (D

RC value) is the lowest. [0108] Alternatively, the communication states of the carriers C1 to C3 may be the uplink throughput of uplink data transmitted by each carrier as described above. In such a case, it is assumed that the uplink throughput transmitted by the carrier C3 is the lowest.

[0109] In step S305, base station 2 connected to mobile terminal 100 by a plurality of carriers 2

The OOC detects the extreme deterioration of the above communication state in the carrier C3.

[0110] Specifically, base station 200C determines whether or not the difference between the communication state of carrier C3 with the most deteriorated communication state and the communication state of other carrier C2 is greater than or equal to a threshold value. If the difference is equal to or greater than the threshold, base station 200C considers that the communication state of carrier C3 is extremely deteriorated.

[0111] In such a case, the base station 200C determines to disconnect the carrier C3 in order to prevent data from being delayed by the carrier C3.

In step S306, base station 200C disconnects carrier C3.

[0113] In steps S307 and S308, the mobile terminal 100 performs data (packet) communication only with the carriers C1 and C2 with the base stations 200A and 200C.

[0114] (2) Carrier disconnection sequence (communication controller led 2)

FIG. 9 is a sequence diagram in which a carrier whose communication state is extremely deteriorated is disconnected under the initiative of the base station control device 300 (communication control device).

[0115] When a powerful carrier disconnection sequence is applied, the base station controller 300 located above the base stations 200A to 200C includes the monitoring unit 220 and the determination unit 2 of the base station 200 described above.

30 shall be provided.

[0116] In steps S401 to S403, the mobile terminal 100 performs data (packet) communication by connecting the carriers C1 to C3 with the base stations 200A to 200C, respectively.

[0117] The carrier disconnection sequence is applied when the mobile terminal 100 is connected to one base station and one carrier.

[0118] In step S404, the carrier between mobile terminal 100 and base station 200C (carrier C

In 3), the communication state deteriorates. In such a case, it is assumed that the communication state of the carrier C3 is most deteriorated among the carriers C1 to C3 monitored by the mobile terminal 100. [0119] Note that the communication state of the carriers C1 to C3 may be the downlink data communication speed (DRC value) of each carrier as described above. In such a case, the downlink data transmission speed (D

RC value) is the lowest.

[0120] Alternatively, the communication states of the carriers C1 to C3 may be the uplink throughput of uplink data transmitted by each carrier as described above. In such a case, it is assumed that the uplink throughput transmitted by the carrier C3 is the lowest.

[0121] In step S405, base station control apparatus 300 detects the above-described extreme deterioration of the communication state in carrier C3.

[0122] Specifically, base station control apparatus 300 determines whether or not the difference between the communication state of carrier C3 with the most deteriorated communication state and the communication state of other carrier C2 is greater than or equal to a threshold value. The If the difference is greater than or equal to the threshold, base station controller 300 considers that the communication state of carrier C3 is extremely deteriorated.

[0123] Base station control apparatus 300 determines to disconnect carrier C3 in order to prevent data from being delayed by carrier C3.

[0124] In step S406, the base station control apparatus 300 instructs the base station 200C to disconnect the carrier C3.

[0125] In steps S408 and S409, the mobile terminal 100 performs data (packet) communication only with the carriers C1 and C2 with the base stations 200A and 200B.

[0126] (Action 'effect)

According to the present embodiment, the base station 200 or the base station control device 300 (communication control device) can detect a carrier whose communication state is extremely deteriorated among a plurality of carriers that transmit and receive data. Base station 200 or base station control apparatus 300 (communication control apparatus) can prevent data from being delayed by disconnecting a carrier whose communication state has been extremely deteriorated.

[0127] According to the present embodiment, the base station 200 or the base station controller 300 (communication controller) transmits the downlink data communication speed of each carrier predicted based on the reception state of each carrier in the mobile terminal 100. Therefore, it can be estimated that the communication state in the downlink direction is deteriorated! /. The base station 200 or the base station control device 300 (communication control device) Data can be prevented from being delayed by detecting a carrier with a low data communication speed and disconnecting the detected carrier.

[0128] According to the present embodiment, the base station 200 or the base station control device 300 (communication control device) degrades the uplink communication state in a carrier having a low uplink throughput of uplink data transmitted by each carrier. Can be estimated. Then, base station 200 or base station control apparatus 300 (communication control apparatus) can prevent a delay in data by detecting a carrier with extremely low uplink throughput and disconnecting the detected carrier.

[Specific example]

Hereinafter, with reference to FIG. 10 and FIG. 11, in the mobile communication system according to the first and second embodiments, the effect of preventing the data from being delayed by a carrier whose communication state has been extremely deteriorated will be specifically described. To do.

[0130] Note that, in Figs. 10 and 11, an example in which the "communication state" is downlink throughput of downlink data transmitted by each carrier will be described, but the same applies to other examples according to the first and second embodiments. The effect is produced.

[0131] In Figs. 10 and 11, it is assumed that the mobile terminal requests a 3 Mbps streaming video. FIG. 10 is a diagram for explaining data delay in a conventional mobile communication system.

[0132] As shown in Fig. 10, 3Mbps streaming data power When divided and allocated to a plurality of carriers (carriers C1 to C3) equally, the downlink throughput required per carrier is 1Mbps.

[0133] Assuming that streaming data is transmitted in units of 100 Kbps packets, 3 Mbps streaming data (30 packets per second) is equally allocated to carriers C1 to C3. For this reason, carriers C1 to C3 are required to transmit 10 packets per second.

However, as shown in FIG. 10, when the downlink throughput of carrier C3 drops to 200 Kbps due to deterioration of the communication status, etc., carrier C3 transmits only two packets per second. Can not.

In such a case, as shown in FIG. 10, in the conventional mobile communication system, the mobile terminal is 1 To receive streaming data (30 packets) for 2 seconds, the carrier C3 packet with a deteriorated communication state was delayed, so it was necessary to buffer for 5 seconds.

[0136] Therefore, in the conventional mobile communication system, due to the data delay in the carrier C3, the mobile terminal cannot receive data even if it can receive data in the carriers C1 and C2 without delay. In other words, the waiting time for combining the data becomes longer.

The mobile terminal cannot reproduce video and audio smoothly.

On the other hand, in the mobile communication system according to the present invention, as shown in FIG.

If the downlink throughput of C3 is extremely low compared to the downlink throughput of other carriers C2 and C3, carrier C3 is disconnected and the packet assigned to carrier C3 is

Assign to C2 and C3.

As a result, in the mobile communication system according to the present invention, the mobile terminal receives 1 second of streaming data (30 packets), but receives data without delay on the 1-Mbps carriers C1 and C2. So you can: 1. Buffer for 5 seconds.

[0139] Therefore, in the mobile communication system according to the present invention, it is possible to prevent data from being delayed by a carrier whose communication state has been extremely deteriorated in a multicarrier in which data is divided and assigned to a plurality of carriers. .

[Other Embodiments]

As described above, the contents of the present invention have been disclosed through one embodiment of the present invention. However, it should not be understood that the description and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments will be apparent to those skilled in the art.

[0141] For example, the functions of the monitoring units 120 and 220 and the determination units 130 and 140 described above can be provided as a program that can be executed by a communication device or a computer.

[0142] Thus, it goes without saying that the present invention includes various embodiments that are not described herein. Therefore, the technical scope of the present invention is determined only by the above-described specific features of the invention according to the scope of claims.

[0143] The entire contents of Japanese Patent Application No. 2005-370172 (filed on December 22, 2005) are incorporated herein by reference.

Industrial applicability As described above, the mobile terminal, the communication control apparatus, and the communication method according to the present invention allow data to be transmitted by a carrier whose communication state is extremely deteriorated in a multicarrier in which data is divided and assigned to a plurality of carriers. This is useful for wireless communications such as mobile communications.

Claims

The scope of the claims

[1] A mobile terminal in which data is divided and allocated to a plurality of carriers, and the data is transmitted to and received from a base station using the plurality of carriers V.

A monitoring unit for monitoring the communication state in each carrier;

A determination unit that determines whether a difference between a communication state of a deteriorated carrier having the most deteriorated communication state out of the plurality of carriers and a communication state of another carrier is equal to or greater than a threshold; and When it is determined that the difference is equal to or greater than the threshold value, a notification unit is provided that notifies the base station to disconnect the deteriorated carrier using the deteriorated carrier. Mobile terminal.

[2] The communication state is a downlink throughput of downlink data transmitted by each carrier,

The mobile terminal according to claim 1, wherein the deteriorated carrier is the carrier having the lowest downlink throughput.

[3] The communication state is transmission power of each carrier,

The mobile terminal according to claim 1, wherein the deteriorated carrier is a carrier having the highest transmission power.

[4] A communication control apparatus in which data is divided and assigned to a plurality of carriers, and transmits and receives the data to and from a mobile terminal using the plurality of carriers.

A monitoring unit for monitoring the communication state in each carrier;

A determination unit that determines whether a difference between a communication state of a deteriorated carrier having the most deteriorated communication state out of the plurality of carriers and a communication state of another carrier is equal to or greater than a threshold; and A carrier control unit comprising: a carrier cutting unit that cuts the deteriorated carrier when it is determined that the difference is equal to or greater than the threshold value.

[5] The communication control device further includes a receiving unit that receives a downlink data communication speed of each carrier predicted based on a reception state of each carrier in the mobile terminal,

The communication state is the downlink data communication speed of each carrier,

5. The communication control device according to claim 4, wherein the deteriorated carrier is the carrier having the lowest downlink data communication speed.

[6] The communication state is an uplink throughput of uplink data transmitted by each carrier.

5. The communication control apparatus according to claim 4, wherein the deteriorated carrier is the carrier having the lowest uplink throughput.

[7] A communication method in which data is divided and allocated to a plurality of carriers, and the data is transmitted / received between a mobile terminal and a communication control apparatus using the plurality of carriers, and a communication state in each carrier Monitoring steps,

Determining whether a difference between a communication state of a deteriorated carrier having the most deteriorated communication state among the plurality of carriers and a communication state of another carrier is equal to or greater than a threshold; and And a step of cutting off the deteriorated carrier when it is determined that the communication method is determined.

[8] The communication state is a downlink throughput of downlink data transmitted by each carrier.

8. The communication method according to claim 7, wherein the deteriorated carrier is the carrier having the lowest downlink throughput.

[9] The communication state is transmission power of each carrier in the mobile terminal,

The communication method according to claim 7, wherein the deteriorated carrier is a carrier having the highest transmission power.

[10] The communication control device further includes a step of receiving a downlink data communication speed of each carrier predicted based on a reception state of each carrier in the mobile terminal,

The communication method according to claim 7, wherein the deteriorated carrier is the carrier having the lowest downlink data communication speed.

[11] The communication state is an uplink throughput of uplink data transmitted by each carrier.

8. The communication method according to claim 7, wherein the deteriorated carrier is the carrier having the lowest uplink throughput.