WO2015025418A1

WO2015025418A1 - Mobile station apparatus, power supply control method in mobile station apparatus, and wireless communication system

Info

Publication number: WO2015025418A1
Application number: PCT/JP2013/072504
Authority: WO
Inventors: 村田秀一
Original assignee: アクセスネットワークテクノロジ株式会社
Priority date: 2013-08-23
Filing date: 2013-08-23
Publication date: 2015-02-26

Abstract

A mobile station apparatus, which uses a frequency band to wirelessly communicate with a base station apparatus, comprises: a first processing unit for processing a first data stream that has been received or is to be transmitted by use of a first frequency band; a second processing unit for processing a second data stream that has been received or is to be transmitted by use of a second frequency band; and a switching control unit for turning off the power supply of the second processing unit without performing any wireless communication with the base station apparatus when it is determined, on the basis of indexes different for the different mobile station apparatuses, that the frequency band is to be switched from the first and second frequency bands to the first frequency band.

Description

Mobile station apparatus, power supply control method in mobile station apparatus, and radio communication system

The present invention relates to a mobile station apparatus, a power control method in the mobile station apparatus, and a radio communication system.

Currently, wireless communication systems such as mobile phone systems and wireless local area networks (LANs) are widely used. Further, in the field of wireless communication, there is ongoing discussion on next-generation communication technology in order to further improve communication speed and communication capacity. For example, the standardization organization 3GPP (3rd Generation Partnership Project) has completed or is considering standardization of a communication standard called LTE (Long Term Evolution) and a communication standard called LTE-A (LTE-Advanced) based on LTE Has been.

For such wireless communication technology, wireless communication may be performed using a plurality of carriers. In LTE, wireless communication using a plurality of carriers is sometimes called, for example, carrier aggregation. Each carrier in the case where carrier aggregation is performed may be referred to as a component carrier (Component Carrier), for example.

In carrier aggregation, for example, since a plurality of component carriers can be used, the frequency band used for wireless communication increases as compared to the case where wireless communication is performed using one component carrier, and thus throughput is reduced. Can be increased.

In addition, as a technology for performing wireless communication using a plurality of carriers, for example, there are technologies such as DC-HSDPA (Dual Cell-High Speed Downlink Packet Access) and DC-HSPA (Dual Cell-High Speed Packet Access). In this technique, for example, a maximum of four carriers are used for wireless communication in the case of downlink communication and a maximum of two carriers in the case of uplink communication. However, a plurality of carriers are used in continuous frequency bands. Also in DC-HSDPA and DC-HSPA, since a plurality of carriers are used for wireless communication, for example, it is possible to increase the throughput.

Examples of such wireless communication technologies include the following technologies.

That is, in a multi-carrier system, when a base station transmits a carrier handover identification message to a mobile station and receives a response message from the mobile station, resource allocation in the old carrier is stopped and resources for the new carrier are allocated. There is technology.

According to this technique, for example, it is possible to provide a method for switching from an old radio frequency (RF) carrier to a new RF carrier in a radio communication system.

In addition, there is a technique in which the serving base station sets the handover report condition and the handover threshold in the handover condition based on the signal strength difference between the PCC (Component Carrier) of the own station and other CCs. is there.

According to this technique, for example, the base station and the user terminal can obtain appropriate handover timing and improve the user throughput.

Further, when the UE is in a dual cell uplink coordinated activation state, the base station can provide a secondary uplink carrier carrier if the amount of uplink data in the secondary uplink carrier serving cell is very small. There are techniques for performing a stop operation on a serving cell. In addition, when the UE is in a dual cell uplink coordinated stop state, if the amount of uplink data of the UE exceeds the activation threshold and the signal quality of the secondary carrier serving cell satisfies the signal quality criterion, the base station Is a technique in which part of uplink data is allocated to a secondary uplink carrier serving cell.

According to this technology, for example, the uplink carrier frequency of multi-cell HSUPA (uplink multi-cell high-speed uplink packet access) can be managed.

Special table 2012-509027 gazette JP 2011-254466 A Special table 2012-516086 gazette

The technology for switching to a new carrier in the multi-carrier system described above is that the mobile station transmits a response message to the carrier handover identification message to the base station, and then sends a new carrier assignment message from the base station. In response, wireless communication using the new carrier is performed. For this reason, the mobile station operates a circuit for performing wireless communication using the old carrier until a new carrier assignment message is received after the response message is transmitted. Therefore, in the mobile station, current is used to operate such a circuit, and current consumption may be wasted.

In addition, a technique in which the serving base station described above sets a handover threshold based on a difference in signal strength between the PCC of the own station and another CC is, for example, a technique related to handover, and is different from a technique for switching carriers. In this technique, for example, handover of a mobile station is determined in a host device such as a serving base station. Therefore, the user terminal operates a circuit for performing wireless communication with the serving base station until receiving a notification regarding the handover decision, and current consumption may be wasted.

Furthermore, in the technology for executing the stop operation for the secondary uplink carrier serving cell described above, for example, such a determination is made in the base station. Therefore, in the UE, a circuit for using the secondary uplink carrier serving cell is operated until the notification of the determination result is received from the base station, and current consumption may be wasted.

Therefore, an object of the present invention is to provide a mobile station apparatus capable of reducing current consumption, a power supply control method in the mobile station apparatus, and a wireless communication system.

According to an aspect, in a mobile station apparatus that performs radio communication with a base station apparatus using a frequency band, a first processing unit that processes a first data stream transmitted or received using the first frequency band A second processing unit that processes the second data stream transmitted or received using the second frequency band, and the first and second frequency bands based on different indices for each mobile station device. A switching control unit that turns off the power of the second processing unit without performing wireless communication with the base station device when it is determined to switch from the frequency band to the first frequency band. .

It is possible to provide a mobile station apparatus capable of reducing current consumption, a power control method in the mobile station apparatus, and a wireless communication system.

FIG. 1 is a diagram illustrating a configuration example of a wireless communication system. FIG. 2 is a diagram illustrating a configuration example of a wireless communication system. 3A to 3D are diagrams illustrating examples of carriers. FIG. 4 is a diagram illustrating a configuration example of a wireless communication system and a mobile device. FIG. 5 is a diagram illustrating a configuration example of a radio communication system, a base station, and an RNC. FIG. 6 is a sequence diagram showing an operation example in the wireless communication system. FIG. 7 is a flowchart showing an operation example of the switching determination process. FIG. 8 is a flowchart showing an operation example of the retransmission control care process. FIG. 9 is a flowchart showing an operation example in the wireless communication system. FIG. 10 is a flowchart showing an operation example of stream switching processing. FIG. 11 is a diagram illustrating a configuration example of a wireless communication system and a mobile device. FIG. 12 is a diagram illustrating a configuration example of a radio communication system, a base station, and an RNC. FIG. 13 is a flowchart showing an operation example in the wireless communication system. FIG. 14 is a flowchart showing an operation example of the switching determination process. FIG. 15 is a flowchart showing an example of the switching determination process. FIG. 16 is a diagram illustrating a configuration example of a transmission unit. FIG. 17 is a diagram illustrating a configuration example of a mobile device. FIG. 18 is a diagram illustrating a configuration example of a base station. FIG. 19 is a diagram illustrating a configuration example of the RNC.

Hereinafter, the present embodiment will be described in detail with reference to the drawings.

[First Embodiment]
FIG. 1 is a diagram illustrating a configuration example of a wireless communication system 10 according to the first embodiment. The radio communication system 10 includes a mobile station device 100, a base station device 200, and a base station control device 300.

The mobile station device 100 performs radio communication with the base station device 200 using the frequency band. The mobile station apparatus 100 includes a first processing unit 190, a second processing unit 191, and a switching control unit 120.

The first processing unit 190 processes the first data stream transmitted or received using the first frequency band.

Also, the second processing unit 191 processes the second data stream transmitted or received using the second frequency band.

When the switching control unit 120 determines to switch the frequency band from the first and second frequency bands to the first frequency band based on a different index for each mobile station apparatus 100, the switching control unit 120 is connected to the base station apparatus 200. The power of the second processing unit 191 is turned off without performing wireless communication.

As described above, in the mobile station device 100, the power of the second processing unit 191 is turned off without performing wireless communication with the base station device 200. For example, the mobile station device 100 is powered off.

Therefore, in this mobile station apparatus 100, the time until the notification after the determination is received, compared with the case where the wireless communication with the base station apparatus 200 is performed and the notification is received from the base station 200 and the power is turned off after the switching is determined. It is possible to eliminate waste of current in the mobile station device 100 that is consumed in the above. Therefore, the mobile station apparatus 100 can reduce current consumption.

Further, in the present mobile station device 100, the power of the second processing unit 191 is turned off without performing wireless communication with the base station device 200. Therefore, after the decision to switch to the first frequency band, The power source of the processing unit 191 can be turned off. Also from this point, it is possible to reduce the current consumption of the mobile station device 100 as compared with the case where the power is turned off by performing wireless communication.

Furthermore, for example, in a certain mobile station apparatus 100, a certain index can be used for switching determination, but other indices may not be used for switching determination. Since the mobile station apparatus 100 performs the switching determination based on an index different for each mobile station apparatus 100, the switching determination can be performed based on an index that can be handled for each mobile station apparatus 100.

[Second Embodiment]
Next, a second embodiment will be described. The second embodiment will be described in the following order.

<Configuration example of wireless communication system>
A configuration example of the wireless communication system will be described. FIG. 2 is a diagram illustrating a configuration example of the wireless communication system 10.

The wireless communication system 10 includes mobile station devices (hereinafter, also referred to as “mobile devices”) 100-1 and 100-2 and base station devices (hereinafter also referred to as “base stations”) 200.

Base station 200 is a wireless communication device that performs wireless communication with mobile devices 100-1 and 100-2. Base station 200 can perform wireless communication in parallel with a plurality of mobile devices 100-1 and 100-2. Further, base station 200 is capable of two-way communication with mobile devices 100-1 and 100-2 within the communicable range of the local station (for example, sometimes referred to as “cell range”).

That is, data transmission (or downlink communication) in the direction from the base station 200 to the mobile devices 100-1 and 100-2 and data transmission (or uplink in the direction from the mobile devices 100-1 and 100-2 to the base station 200). Communication). Base station 200 allocates radio resources (for example, time resource and frequency resource) to mobile devices 100-1 and 100-2 by scheduling or the like. Base station 200 transmits the allocated radio resource as a control signal to mobile devices 100-1 and 100-2. The base station 200 and the mobile devices 100-1 and 100-2 perform downlink communication and uplink communication using radio resources.

Mobile devices 100-1 and 100-2 are movable wireless communication devices such as feature phones and smartphones. The mobile devices 100-1 and 100-2 receive various services such as a call service, video distribution, and homepage browsing by performing wireless communication with the base station 200.

In the second embodiment, the base station 200 may perform wireless communication using a plurality of component carriers (CC).

3A to 3C are diagrams showing examples of component carriers. The component carrier represents a frequency band having a maximum bandwidth of 20 MHz, for example, and corresponds to one carrier wave. Performing wireless communication using a plurality of component carriers or a plurality of frequency bands may be referred to as carrier aggregation, for example. In the following, each component carrier may be referred to as a carrier, for example.

Carrier aggregation is standardized in 3GPP as a standard in LTE (Long Term Evolution), for example.

As shown in FIG. 3 (A) and FIG. 3 (B), a plurality of carriers are assigned to continuous frequency bands, but as shown in FIG. 3 (C), a plurality of carriers are assigned to discontinuous frequency bands. May be assigned. In uplink communication and downlink communication, up to five carriers may be used, and the number of carriers may be different between uplink communication and downlink communication. For example, three carriers may be provided for uplink communication and five carriers for downlink communication. Also, the carrier bandwidths may not all be the same. The mobile devices 100-1 and 100-2 can use some or all of the five carriers.

In carrier aggregation, since a maximum frequency bandwidth of 100 MHz can be obtained, it is possible to improve the throughput of the mobile devices 100-1 and 100-2 as compared with wireless communication using a frequency bandwidth of 20 MHz.

Further, in the second embodiment, the base station 200 may perform radio communication using a dual cell. In the dual cell, for example, wireless communication is performed using a DL (Down Link) carrier and a UL (Up Link) carrier having a maximum bandwidth of 5 MHz. A DL carrier is bundled with a maximum of four carriers, and a UL carrier is bundled with a maximum of two carriers. FIG. 3D is a diagram illustrating an example of a DL carrier. As shown in FIG. 3D, in the dual cell, a plurality of carriers are used in a continuous frequency band. Each DL carrier or UL carrier may be referred to as a carrier, for example. In the example shown in FIG. 3D, an example in which two carriers are used as DL carriers is shown.

The dual cell is standardized in 3GPP as a standard in DC-HSDPA or DC-HSPA, for example.

The carrier in the carrier aggregation and the carrier in the dual cell, for example, each represent a frequency band having a predetermined bandwidth. In the following, both the carrier in the carrier aggregation and the carrier in the dual cell may be referred to as “carrier”, for example.

In the second embodiment, the mobile devices 100-1 and 100-2 and the base station 200 can transmit or receive one data stream, for example, to one carrier. Accordingly, the mobile devices 100-1 and 100-2 and the base station 200 can transmit or receive a plurality of data streams using a plurality of carriers. Hereinafter, the data stream may be referred to as a stream, for example.

<Configuration example of mobile device>
Next, a configuration example of the mobile devices 100-1 and 100-2 will be described.

Note that the mobile devices 100-1 and 100-2 have the same configuration and will be described as the mobile device 100 unless otherwise specified.

Also, with regard to configuration examples of the mobile device 100 and the base station 200 described later, a configuration example in the case of using a dual cell such as DC-HSDPA or DC-HSPA will be described.

Furthermore, configuration examples of the mobile device 100 and the base station 200 will be described using an example in which a maximum of two streams are transmitted or received.

FIG. 4 is a diagram illustrating a configuration example of the wireless communication system 10 including the mobile device 100. The wireless communication system 10 includes a mobile device 100 and an NW (network) 400. The NW 400 includes first and second base stations (BTS # 1, BTS # 2) 200-1 and 200-2, and an RNC (Radio Network Controller) 300. The configurations of the first and second base stations 200-1 and 200-2 and the RNC 300 will be described later with reference to FIG.

In the example of FIG. 4, the first base station 200-1 transmits the first stream using the first carrier (for example, DL carrier # 1), and the second base station 200-2 transmits the second carrier. In this example, the second stream is transmitted using (for example, DL carrier # 2). In the example of FIG. 4, transmission of a plurality of streams is realized by being transmitted from a plurality of base stations 200.

Also, the mobile device 100 can receive two streams using two carriers, and can receive one stream using one carrier. In the mobile device 100, for example, by performing processing such as frequency separation, the streams transmitted from the two base stations 200-1 and 200-2 can be separated into streams from the base stations 200-1 and 200-2. .

The mobile device 100 includes an antenna (ANT1) 101, a receiving unit 110, a MAC (Media Access Control) unit 130, an RLC (Radio Link Control) unit 140, a PDCP (Packet Data Convergence Protocol) unit 150, an application unit 160, and a transmission unit. 170.

The receiving unit 110 includes an RF (Radio Frequency) unit 111, an L1 unit 115, a switching control unit 120, and a power supply control unit 121. Further, the RF unit 111 includes a first RX 112 and a second RX 113.

Furthermore, the receiving unit 110 includes a despreading unit 116, a decoding unit 117, and first and second BLER (Block Error Rate) measuring

units

118 and 119.

The antenna 101 receives the first and second radio signals transmitted from the first and second base stations 200-1 and 200-2, respectively, and outputs them to the receiving unit 110. In this case, the first radio signal corresponds to the first stream, and the second radio signal corresponds to the second stream. The antenna 101 transmits the radio signal output from the transmission unit 170 to the first and second base stations 200-1 and 200-2.

For example, the first RX 112 receives the first radio signal transmitted from the first base station 200-1 by frequency separation from the antenna 101, and performs amplification processing and frequency conversion processing on the first radio signal. The digital signal is converted. The first RX 112 outputs the converted first radio signal to the despreading section 116 as a first received signal.

Also, the second RX 113 receives, for example, the second radio signal transmitted from the second base station 200-2 by frequency separation from the antenna 101, and performs amplification processing or frequency on the second radio signal. Conversion processing, conversion to digital signal, etc. are performed. The second RX 113 outputs the converted second radio signal to the despreading section 116 as a second received signal.

The despreading unit 116 performs despreading processing on the first and second received signals by using the spreading codes used in the first and second base stations 200-1 and 200-2, respectively, and provides interference components. First and second received signals are obtained by removing the above. Despreading section 116 outputs the first and second received signals after the despreading process to decoding section 117.

The decoding unit 117 performs error correction decoding processing on the first and second received signals after despreading processing to obtain first and second decoded data. For example, the first stream transmitted from the first base station 100-1 is obtained by obtaining the first decoded data, and the second stream is transmitted from the second base station 100-2 by obtaining the second decoded data. Obtain a second stream. The decoding unit 117 outputs the first and second decoded data to the first and second

BLER measurement units

118 and 119, respectively.

The first and second

BLER measurement units

118 and 119 measure the block error rate for the first and first decoded data output from the decoding unit 117, respectively. For example, the first and second decoded data correspond to the first and second carriers, respectively. Therefore, for example, the first BLER measurement unit 118 measures the block error rate for the first carrier, and the second BLER measurement unit 119 measures the block error rate for the second carrier.

The block error rate is one index for measuring the downlink communication quality of each carrier, and the index for measuring the downlink communication quality may be CQI (Channel Quality Indicator) in addition to the block error rate. In this case, the first and second

BLER measurement units

118 and 119 measure SIR (Signal to Interference Ratio) for the first and second decoded signals, respectively, and the first and second

BLER measurement units

118 and 119 correspond to the measured SIR. 2 CQI is set.

The first and second

BLER measurement units

118 and 119 output the first and second decoded data to the MAC unit 130, and the measurement results for the first and second decoded data (first and second measurement respectively). Result) to the switching control unit 120.

The first RX 112, the circuit that performs processing for the output from the first RX 112 in the despreading unit 116, and the circuit that performs processing for the output from the first RX 112 in the decoding unit 117 are, for example, the first This is a circuit for performing processing on the stream. A circuit that performs processing on the first stream corresponds to, for example, the first processing unit 190 in the first embodiment.

In addition, a circuit that performs processing for the output from the second RX 113 in the second RX 113 and the despreading unit 116, and a circuit that performs processing for the output from the second RX 113 in the decoding unit 117 are, for example, the second This is a circuit for performing processing on the stream. A circuit that performs processing on the second stream corresponds to, for example, the second processing unit 191 in the second embodiment.

In FIG. 4, a circuit that performs processing for the first stream and a circuit that performs processing for the second stream are indicated by dotted lines.

When one of the first and second measurement results is lower than the threshold, the switching control unit 120 determines to stop receiving the first or second stream corresponding to the lower measurement result. To do. At this time, the switching control unit 120 instructs the power control unit 121 to turn off the power of the unused circuit corresponding to the stopped first or second stream.

When the first and second measurement results are both lower than the threshold, the switching control unit 120 receives the stream having the lower measurement result among the first and second measurement results. Can be stopped, or both of the two streams can be stopped.

Also, the switching control unit 120 instructs the power supply control unit 121 to turn on the power of the unused circuit when the first or second measurement result lower than the threshold value is subsequently higher than the threshold value.

On the other hand, when the switching control unit 120 detects that the first and second measurement results are higher than the threshold value, the switching control unit 120 continues to receive the first and second streams. In this case, the switching control unit 120 does not particularly instruct the power supply control unit 121. Details of the operation in the switching control unit 120 will be described in an operation example described later.

The power control unit 121 controls the power on or off of a circuit that performs processing for the first or second stream based on the instruction output from the switching control unit 120.

For example, when the power control unit 121 receives an instruction to turn off the power of a circuit that performs processing for the first stream, the power control unit 121 performs processing for the first stream (for example, the first RX 112 and the despreading unit 116). Power of the circuit that performs processing for the output from the first RX 112 and the circuit that performs processing for the output from the first RX 112 in the decoding unit 117. Further, for example, when receiving an instruction to turn on the power of the unused circuit, the power control unit 121 turns on the power of the unused circuit whose power is turned off.

When the power supply is turned off or on, the power supply control unit 121 notifies the CQI generation unit 171 of the transmission unit 170 to that effect.

The MAC unit 130 includes a MUX 131. The MUX 131 multiplexes the first and second decoded data output from the first and second measuring

units

118 and 119, generates MAC packet data including the multiplexed first and second decoded data, Output to the RLC unit 140.

The MUX 131 receives one of the first and second decoded data when the unused circuit is powered off. In this case, the MUX 131 outputs without multiplexing. To do.

Further, the MAC unit 130 generates a MAC packet data by adding a header to the RLC packet data output from the RLC unit 140, and outputs the generated MAC packet data to the transmission unit 170.

The RLC unit 140 extracts RLC packet data from the MAC packet data output from the MUX 131, and outputs the extracted RLC packet data to the PDCP unit 150. Further, the RLC unit 140 generates RLC packet data by adding a header or the like to the PDCP packet data output from the PDCP unit 150, and outputs the generated RLC packet data to the MAC unit 130.

The PDCP unit 150 extracts PDCP packet data from the RLC packet data output from the RLC unit 140 by discarding a header or the like, and outputs the extracted PDCP packet data to the application unit 160. In addition, the PDCP unit 150 generates PDCP packet data by adding a header or the like to the data output from the application unit 160, and outputs the generated packet data to the RLC unit 140.

The application unit 160 includes an RRC (Radio Resource Controller) 161. The RRC 161, for example, with the RRC in the RNC 300 (shown in FIG. 5 described later), processing such as connection, maintenance, and release of an RRC connection, QoS (Quality Of Service) control, and base stations 200-1 and 200 -2 is selected.

Further, the application unit 160 extracts, for example, data transmitted from the first and second base stations 200-1 and 200-2 from the PDCP packet data output from the PDCP unit 150, via the input / output IF. Can be displayed on a monitor or output from a microphone.

Furthermore, the application unit 160 inputs character data input from a monitor or the like via the input / output IF, image data captured by a camera, and the like, and outputs these data to the PDCP unit 150.

The transmission unit 170 includes a CQI generation unit 171. The CQI generation unit 171 receives the first and second measurement results from the first and second

BLER measurement units

118 and 119 via the switching control unit 120 and the power supply control unit 121, respectively. Then, the CQI generation unit 171 generates CQIs corresponding to the first and second measurement results, respectively.

In addition, when the CQI generation unit 171 receives a notification that the power supply is turned off or on from the power supply control unit 121, the CQI generation unit 171 generates the switching advance notice information, and sends the generated change advance notice information to the CQI. Transmit to the first or second base station 200-1, 20-2. Alternatively, the CQI generating unit 171 may add a switch notice including the switch notice information to the CQI and transmit it as a CQI. In the following description, for example, a description may be given assuming that a switching notice is added to the CQI.

For example, the CQI generation unit 171 generates 1-bit switching advance notice information indicating switching to one stream or switching to a plurality of streams based on a power off or on notification. For example, the CQI generation unit 171 may generate a switch advance notice based on an instruction from the switch control unit 120 and transmit it to the NW 400, and the switch advance notice may be generated under the control of the switch control unit 120. it can.

The transmission unit 170 receives the MAC packet data output from the MAC unit 130 and converts it into a radio signal by performing error correction coding processing, modulation processing, spreading processing, frequency conversion processing, and the like.

Also, the transmission unit 170 converts the CQI generated by the CQI generation unit 171 and the switching advance notice into a radio signal by performing error correction coding processing and the like, similarly to the MAC packet data. Transmitter 170 outputs a radio signal to antenna 101.

FIG. 5 is a configuration example of the radio communication system 10, and also illustrates configuration examples of the first and second base stations 200-1, 200-2 and the RNC 300. Since the first and second base stations 200-1 and 200-2 have the same configuration, only the first base station 200-1 will be described, and the description of the configuration of the second base station 200-2 will be omitted. To do.

The first base station 200-1 includes a first antenna 201-1, a first receiving unit 210-1, a first MAC unit 220-1, a first RLC unit 230-1, and a first PDCP unit. 240-1 and a first transmitter 250-1. In addition, the first transmission unit 250-1 includes a first encoding unit 251-1, a first modulation unit 252-1, and a first TX 253-1.

The first antenna 201-1 transmits the radio signal output from the first transmission unit 250-1 to the mobile device 100. Also, the first antenna 201-1 receives the radio signal transmitted from the mobile device 100 and outputs the received radio signal to the first receiving unit 210-1.

The first receiving unit 210-1 performs frequency conversion processing, despreading processing, error correction decoding processing, and the like on the received radio signal to obtain received data in the baseband. The first receiving unit 210-1 outputs the received data to the first MAC unit 220-1.

The first MAC unit 220-1 generates MAC packet data including received data, and outputs the generated MAC packet data to the first RLC unit 230-1. Further, the first MAC unit 220-1 receives the RLC packet output from the first RLC unit 230-1, generates a MAC packet data by adding a header to the RLC packet, and generates the MAC packet data. The MAC packet data is output to the first transmission unit 250-1.

The first RLC unit 230-1 extracts the RLC packet data by discarding the header from the MAC packet data output from the first MAC unit 230-1, and extracts the extracted RLC packet data. Output to the first PDCP unit 240-1. Also, the first RLC unit 230-1 receives the PDCP data from the first PDCP unit 240-1, generates RLC packet data by adding a header to the PDCP packet data, etc. To the unit 220-1.

The first PDCP unit 240-1 extracts PDCP packet data from the RLC packet data output from the first RLC unit 230-1 by discarding the header or the like, and the extracted PDCP packet data is sent to the RNC 300. Send. The first PDCP unit 240-1 receives the data transmitted from the RNC 300, generates PDCP packet data by adding a header or the like, and outputs the PDCP packet data to the first RLC unit 230-1.

The first encoding unit 251-1 performs error correction encoding processing on the MAC packet data output from the first MAC unit 220-1, and outputs the MAC packet data after the error correction encoding processing to the first To the modulation unit 252-1.

The first modulation unit 252-1 performs modulation processing on the MAC packet data after the error correction coding processing to convert it into a transmission signal, and outputs the converted transmission signal to the first TX 253-1 To do.

The first TX 253-1 generates a radio signal by performing spreading processing using a spreading code, frequency conversion processing, etc. on the transmission signal, and outputs the generated radio signal to the first antenna 201-1. To do.

Note that the second base station 200-2 includes a second receiver 210-2, a second MAC unit 220-2, a second RLC unit 230-2, a second PDCP unit 240-2, and a second 2 transmission units 250-2. The second transmission unit 250-2 includes a second encoding unit 251-2, a second modulation unit 252-2, and a second TX 253-2.

As described above, in the second embodiment, the first base station 200-1 transmits the first stream to the mobile device 100 using the first carrier. Also, the second base station 200-2 transmits the second stream to the mobile device 100 using the second carrier having a frequency band adjacent to the first carrier.

Therefore, the first and second receiving units 210-1 and 210-2 and the first and second TX 253-1 and 253-2 process signals of different carriers, for example.

The RNC 300 is, for example, a base station control device that controls one or more base stations 100 under its control. The RNC 300 includes a mobile device switching detection unit 310, a switching control unit 320, a De-MUX (demultiplexer) 330, and an RRC 340.

The mobile station switching detection unit 310 receives the PDCP packet data transmitted from the first and second base stations 200-1 and 200-2, and extracts the CQI and the switching advance notice added to the CQI from the packet data. To do. Then, when the mobile station switching detection unit 310 extracts the switching advance notice, the mobile station switching detection unit 310 monitors the retransmission control performed by the first or second base station 200-1 or 200-2.

As described above, the mobile device 100 that has received the first and second streams stops receiving one of the streams based on its own judgment. In this case, the RNC 300 receives the switching advance notice and detects that the mobile device 100 stops receiving one of the streams.

However, since the mobile station 100 stops receiving one of the streams, the first or second base station 200-1 or 200-2 controls the mobile station 100 to perform retransmission control (for example, H-ARQ). (Hybrid-Automatic Repeat Request) control)). If such retransmission control continues for a long time, the load on the NW 400 is affected.

Therefore, the RNC 300 monitors the retransmission control in the first or second base station 200-1 or 200-2. Also, with this retransmission control, the mobile device 100 can eliminate missed reception for a stream whose power is turned off. That is to say, mobile station 100 can relieve missed reception by retransmission control for streams whose reception has been stopped due to power-off.

Monitoring of retransmission control is performed as follows, for example. That is, when the mobile switching detection unit 310 extracts the switching advance notice, it monitors the number of retransmission control in the first or second base station 200-1 or 200-2 that has output the switching advance notice. For example, each time the first or second transmission unit 250-1 or 250-2 performs retransmission control on the mobile device 100, the first or second transmission unit 250-1 or 250-2 transmits the fact to the RNC 300.

The mobile device switching detection unit 310 determines that the mobile device 100 has an adverse effect due to the stop of reception of one stream when the number of times of retransmission control in a certain period is greater than or equal to a threshold value when the switching advance notice indicates power off. Thus, it is determined to change the transmission data from 2 streams to 1 stream.

In addition, when the switching advance notice indicates that the power is on, the mobile device switching detection unit 310 determines to change the transmission data from 1 stream to 2 streams when the number of times of retransmission control in a certain period is less than the threshold. . The mobile device switching detection unit 310 notifies the switching control unit 320 of the determination.

When the switching control unit 320 receives the change notification to one stream from the mobile device switching detection unit 310, the switching control unit 320 controls the De-MUX 330 to stop the transmission data from being separated into two streams and to output the one stream. To do. In addition, when the switching control unit 320 receives a notification of change to two streams from the mobile device switching detection unit 310, the switching control unit 320 controls the De-MUX 330 to separate the transmission data into two streams.

The De-MUX 330, under the control of the switching control unit 320, separates transmission data transmitted from the host device of the RNC 300 into two streams, or transmits the transmission data as one stream as it is as the first or second base station 200-1, To 200-2.

For example, the RRC 340 performs setting, maintenance, release, etc. of the RRC connection to the mobile devices 100 subordinate to the first and second base stations 200-1 and 200-2, and broadcast notification, calling to the mobile device 100 Set up communication channels.

<Operation example>
Next, an operation example in the second embodiment will be described. 6 to 10 are diagrams showing an operation example in the second embodiment. In this operation example, a case will be mainly described where dual cell communication by DC-HSDPA is performed.

FIG. 6 is a sequence diagram showing an operation example in the wireless communication system 10. In FIG. 6, “MS” is the mobile device 100, “L1” in “NW” is the first and second receiving sections 210-1, 210-2, and “MAC” in “NW” is the first and second receivers. 2 MAC units 220-1 and 220-2.

Between the mobile device 100 and the NW 400, dual cell communication using a plurality of streams is performed (S10). However, in the second embodiment, description will be made assuming that dual-cell communication with two streams is performed.

When the dual cell communication is being performed, the mobile device 100 performs a switching determination process for one stream (S11).

FIG. 7 is a flowchart showing an operation example of the switching determination process. The process illustrated in FIG. 7 is a process mainly performed by the switching control unit 120 and the power supply control unit 121.

When the mobile device 100 starts this process (S110), it determines the communication state (S111).

For example, when dual-cell communication is performed between the RRC 161 of the mobile device 100 and the RRC 340 of the RNC 300, information such as whether or not the communication is based on a plurality of streams or which carrier is used is exchanged. Based on the exchanged information, the mobile device 100 can determine whether the communication state is communicating with a plurality of streams or communicating with one stream. For example, the switching control unit 120 obtains information on the communication state from the RRC 161 and makes a determination based on this information.

If the mobile device 100 determines that the communication state is communication using a plurality of streams (“multiple streams” in S111), the mobile device 100 determines whether the reception quality is poor (S112).

For example, the switching control unit 120 may select one of the first and second measurement results (for example, the first and second block error rates) output from the first and second

BLER measurement units

118 and 119, respectively. Is lower than the threshold value, it is determined that the reception quality state is bad. Otherwise, it is determined that the reception quality state is not bad. As the reception quality, for example, other index values such as SIR and CQI may be used besides the block error rate. Regardless of the index value, for example, the reception quality when the mobile device 100 receives each radio signal transmitted from the first and second base stations 200-1 and 200-2 is measured.

When the mobile device 100 determines that the state of reception quality is not bad (NO in S112), the mobile device 100 ends the series of processing (S116). In this case, for example, since the quality state of the wireless communication using a plurality of streams of the mobile device 100 is good, the process is terminated without switching to one stream.

On the other hand, when the mobile device 100 determines that the state of reception quality is poor (YES in S112), the mobile device 100 determines to switch to one stream (S113). Then, the mobile device 100 notifies the switching to one stream together with the CQI (S114), and turns off the power of the unused circuit (S115). *

For example, when switching to one stream is determined by the switching control unit 120, the CQI generation unit 171 generates a switching advance notice. In this case, since the CQI generation unit 171 periodically transmits the CQI to the base stations 200-1 and 200-2, the CQI is sent to the base stations 200-1 and 200-2. it can.

Note that the processing order of S114 and S115 may be reversed.

Then, the mobile device 100 ends a series of processes (S116).

Returning to FIG. 6, when the mobile device 100 determines to switch to one stream, the mobile device 100 transmits a notification of switching notice to the first or second base stations 200-1 and 200-2. For example, the mobile device 100 transmits a switching advance notice to the base stations (first or second base stations 200-1 and 200-2) that transmit the stream determined to be stopped (S12).

Also, the mobile device 100 notifies the MAC unit 130 of switching to one stream (S13). For example, when the switching control unit 120 determines to switch to one stream, the switching control unit 120 notifies the MAC unit 130 of switching to one stream. By notification to the MAC unit 130, for example, the multiplexing processing of the first and second streams in the MUX 131 can be stopped.

Next, the mobile device 100 turns off unused power, and then starts receiving one stream (S14).

On the other hand, when the first or second base station 200-1 or 200-2 receives the switching advance notice, it performs retransmission control care (S16).

FIG. 8 is a flowchart showing an operation example of processing related to retransmission control care. For example, the process is performed by the first or second base station 200-1, 200-2 or the RNC 300 that has received the switch notice.

When the first or second base station 200-1 or 200-2 starts processing (S160), it receives a one-stream switching notice from the mobile device 100 (S161).

Next, the first or second base station 200-1 or 200-2 confirms the H-ARQ result for the data transmitted to the mobile device 100 (S162).

For example, as described above, since the mobile device 100 is powered off, the mobile device 100 stops receiving any stream, and the first or second base station 200-1 or 200-2 uses the mobile device 100. I don't know about the situation. Therefore, the first or second base station 200-1 or 200-2 that transmits the stopped stream may perform retransmission control on the mobile device 100.

For example, the first and second receiving units 210-1 and 210-2, or the first and second MAC units 220-1 and 220-2 may receive a negative response (NACK (Negative Acknowledge)) or affirmation with respect to transmission data. Confirm receipt of response (ACK (Acknowledge)). When the first and second reception units 210-1 and 210-2 or the first and second MAC units 220-1 and 220-2 receive a negative response, the RNC 300 detects that the mobile device has been switched. Notification to the unit 310.

Note that the mobile device 100 generates a signal related to a negative response or an affirmative response using the MAC unit 130 or the application unit 160 and transmits the signal to the NW 400, for example. For example, after determining to switch to one stream (S11), the mobile device 100 transmits a negative response even when receiving the stream on which reception has been stopped, and determines to switch to multiple streams (S20), and then returns an affirmative response. Will be sent.

Next, the RNC 300 determines whether or not the retransmission control has continued for a threshold value or more (S163). For example, the mobile device switching detection unit 310 determines whether or not the number of negative responses in a certain period continues for a threshold value or more.

The RNC 300 determines to switch to 1-stream transmission when retransmission control continues for a threshold value or more (YES in S163) (S164). For example, the mobile device switching detection unit 310 notifies the switching control unit 320 when the number of negative responses in a certain period continues for a threshold or more, and the switching control unit 320 determines switching to one stream. In this case, the switching control unit 320 causes the base station (the first or second base station 200-1 or 200-2) on the side that transmitted the switching advance notice to the RNC 300 to stop transmission of transmission data. The De-MUX 330 is controlled. Thereby, one stream communication is started in NW400.

Then, the RNC 300 ends a series of processes (S165).

On the other hand, when the retransmission control does not continue for the threshold value or more (NO in S163), the RNC 300 determines whether or not the fixed period has expired (S166). For example, the mobile device switching detection unit 310 counts a certain period and determines whether or not the period has expired.

When the RNC 300 has expired for a certain period (YES in S166), the series of processes is terminated (S165). When the certain period has not expired (NO in S166), the process proceeds to S163 and the above-described processes are repeated.

Returning to FIG. 6, the first or second base station 200-1, 200-2 and RNC 300 that have received the notice of switching notice perform retransmission control care (S 16), and one-stream communication between NW 400 and mobile device 100 Is started (S15, S17).

When 1-stream communication is started, the mobile device 100 determines whether to switch to a plurality of streams (S20).

FIG. 7 is a flowchart showing an operation example of the switching determination process. That is, when the communication state is the one stream state (“1 stream” in S111), the mobile device 100 determines whether or not the reception quality state is good (S116).

For example, even the first or second base station 200-1 or 200-2 that has stopped transmitting a stream may transmit a notification signal, a reference signal, or the like. The first or second

BLER measurement unit

118 or 119 of the mobile device 100 measures the reception quality (for example, the first or second block error rate) for the signal such as the broadcast signal or the reference signal, and the first or second Is notified to the switching control unit 120. When the first measurement result or the second measurement result exceeds the threshold, the switching control unit 120 determines that the reception quality state is improved as the reception quality deterioration state has been eliminated (YES in S116). On the other hand, when the first or second measurement result does not exceed the threshold value, the switching control unit 120 determines that the degradation state of the reception quality is not eliminated and the reception quality is not improved (NO in S116). ).

When it is determined that the state of reception quality has improved (YES in S116), the mobile device 100 determines to perform switching to a plurality of streams (S117), and transmits a switching advance notice together with CQI (S118). The power of the unused circuit whose power is turned off is turned on (S119). Then, the mobile device 100 ends the series of processes (S116).

On the other hand, when mobile device 100 determines that the state of reception quality is not good (NO in S116), the deterioration state of reception quality is not eliminated, and one stream communication is continued, and a series of processing ends (S116). . *

In the example of FIG. 6, description will be made assuming that the reception quality is improved and switching to a plurality of streams is performed. The mobile device 100 transmits a notice of switching notice to the stream-side base stations (first or second base stations 200-1 and 200-2) that have stopped (S21). For example, the CQI generation unit 171 transmits a switch notice including 1-bit information indicating that the power is turned on or not 1-stream transmission (or multiple-stream transmission).

The mobile device 100 also notifies the MAC unit 130 in the mobile device 100 of switching to a plurality of streams (S22). By the notification to the MAC unit 130, for example, multiplexing processing can be performed in the MUX 131.

Then, the mobile device 100 starts receiving a plurality of streams using the unused circuit whose power is turned on (S23).

On the other hand, the first or second base station 200-1 or 200-2 that has received the switching advance notice performs retransmission control care (S25).

As in the retransmission control care (S16) described above, for example, the RNC 300 monitors the number of retransmission controls in the first or second base station 200-1 or 200-2. The first or second base station 200-1 or 200-2 that has received the switch notice notice notifies the mobile station switch detection unit 310 of the number of times the NACK signal has been received. Then, the mobile station switching detection unit 310 determines whether to restore to the multi-stream communication or to continue the one-stream communication based on the number of times the NACK signal is received for a certain period (S163 in FIG. 8). In this example, the number of retransmission controls is equal to or less than the threshold, and the mobile device switching detection unit 310 determines restoration to a plurality of streams (YES in S166).

Returning to FIG. 6, when retransmission control care is completed (S25), communication of a plurality of streams is started on the NW 400 side (S26), and communication of a plurality of streams is also started in the mobile device 100 (S24).

As described above, in the second embodiment, when it is determined that the reception quality for any one of the plurality of streams has deteriorated, the mobile device 100 determines to switch to one stream and supplies power to unused circuits. Is turned off by itself (for example, YES in S112 and S115 in FIG. 7).

For example, the mobile device 100 transmits quality information to the first or second base station 200-1 or 200-2, and sends the quality information to one stream from the first or second base station 200-1 or 200-2. There is a case where the power of the unused circuit is turned off after waiting for the switching instruction.

However, in this mobile device 100, when the quality degradation is judged, the power of the unused circuit is turned off by itself, so that the current consumption for the time until the instruction to switch to one stream is received after the quality information is transmitted is wasted. In addition, the current consumption in the mobile device 100 can be reduced.

Also, after communication is performed between the RRC 161 and the RRC 340, switching from a plurality of streams to one stream may be performed. In communication between the

RRC

161 and 340, communication is performed between the mobile device 100 and the RNC 300 via the first or second base stations 200-1 and 200-2. Therefore, for example, it may take a very long time for the switching time from when the mobile device 100 or the RNC 300 determines to switch to when switching to one stream.

However, in this mobile device 100, the power supply is turned off at its own judgment without waiting for notification from the NW 400 (for example, YES in S112 and S115 in FIG. 7). Can be planned.

Next, other examples in the second embodiment will be described. For example, the mobile device 100 is an example of transmitting a switching instruction pattern instead of the switching advance notice. The switching instruction pattern includes, for example, information indicating the number of streams after switching (or the number of frequency bands after switching).

FIG. 9 is a sequence example in the wireless communication system 10 when a switching instruction pattern is transmitted, and FIG. 10 is a flowchart showing an operation example on the NW 400 side. The same processing parts as those in the above example are denoted by the same reference numerals. Also in this example, a description will be given of an example of two streams as a plurality of streams.

When dual cell communication is performed between the mobile device 100 and the NW 400 (S10), the mobile device 100 determines whether to switch to one stream (S11 and FIG. 7). When determining that the reception quality for any of the two streams has deteriorated, the mobile device 100 determines to switch to one stream (YES in 112 of FIG. 7, S113).

Returning to FIG. 9, next, the mobile device 100 generates a switching instruction pattern instructing switching to one stream, and transmits the switching instruction pattern to the first or second base station 200-1 or 200-2 ( S30).

For example, when the switching control unit 120 determines to switch to one stream, it notifies the power control unit 121 of switching to one stream, and the power control unit 121 notifies the CQI generation unit 171 of this notification. Upon receiving this notification, the CQI generating unit 171 generates a switching instruction pattern indicating that the number of streams after switching is “1”, and transmits the generated switching instruction pattern together with the CQI. The transmission destination is, for example, a base station (first or second base station 2001, 200-2) that is transmitting the stream on the reception stop side.

The first or second base station 200-1 or 200-2 that has received the switching instruction pattern performs stream switching processing.

FIG. 10 is a flowchart showing an operation example of the stream switching process. For example, it is a process performed by the RNC 300.

When the RNC 300 starts this processing (S121), it confirms the CQI pattern (S122). For example, the first or second base station 200-1 or 200-2 receives the switching instruction pattern transmitted from the mobile device 100 and transmits it to the RNC 300. The mobile device switching detection unit 310 of the RNC 300 receives the switching instruction pattern and confirms the content thereof.

Next, for the switching instruction pattern (S123), the RNC 300 determines to start communication with one stream when the switching instruction pattern indicates switching to one stream ("1 stream" in S123) (S126). ).

For example, the mobile device switching detection unit 310 notifies the switching control unit 320 that the switching instruction pattern indicates switching to one stream, and the switching control unit 320 that has received this notification determines the start of one-stream communication. To do. When the switching control unit 320 determines the start of one-stream communication, the switching control unit 320 causes the De-MUX 330 to stop transmission data separation.

Then, the RNC 300 ends a series of processes (S126).

On the other hand, when the switching instruction pattern indicates switching to a plurality of streams (“multiple streams” in S123), the RNC 300 starts communication using a plurality of streams (S124).

For example, the mobile device switching detection unit 310 notifies the switching control unit 320 that the switching instruction pattern represents switching to a plurality of streams such as two streams. Upon receiving this notification, the switching control unit 320 controls the De-MUX 330 so as to separate the transmission data into data for a plurality of streams.

Then, the RNC 300 ends a series of processes (S125).

On the other hand, when the RNC 300 does not receive the switching instruction pattern (“None” in S123), the RNC 300 continues the stream communication and ends the series of processes (S124).

Since the switching instruction pattern represents, for example, the number of streams after switching, the number of bits may be larger than the notification of switching notice. However, when the mobile device 100 transmits the switching instruction pattern, the first and second base stations 200-1, 200-2 and RNC 300 switch to one stream or switch to multiple streams according to the switching instruction pattern. It becomes possible to do. In this example, retransmission control care (for example, S16 in FIG. 6 and FIG. 8) is not performed in the first and second base stations 200-1 and 200-2 and the RNC 300. Therefore, it is possible to reduce the processing of the first and second base stations 200-1 and 200-2 and the RNC 300.

However, even when the switching instruction pattern is used, for example, switching control care (for example, 8) may be performed. This is because, by performing retransmission control in the first and second base stations 200-1 and 200-2, it is possible to relieve the reception failure of the stream on the side where the power is turned off in the mobile device 100.

<Third Embodiment>
Next, a third embodiment will be described. In the third embodiment, for example, the switching parameters and threshold values used for stream switching are negotiated in advance between the mobile device 100 and the NW 400, and the switching parameters and threshold values used are mutually determined or Share it. Then, the stream is switched based on the negotiated switching parameter and the threshold value. The threshold value is, for example, a value indicating whether or not the mobile device 100 performs switching to one stream (or switching to a plurality of streams).

FIGS. 11 and 12 show configuration examples of the mobile device 100 and the NW 400 in the third embodiment, respectively.

As shown in FIG. 11, the mobile device 100 further includes a parameter holding unit 123. The parameter holding unit 123 stores the switching parameter and the threshold value in advance, and also stores the switching parameter and the threshold value negotiated with the NW 400.

12, the RNC 300 further includes a parameter holding unit 350. The parameter holding unit 350 also stores switching parameters and threshold values in advance, and stores the switching parameters and threshold values negotiated with the mobile station 100.

As for the types of switching parameters, the parameter holding unit 350 stores more types of switching parameters than the parameter holding unit 123 so that any switching parameter of the mobile device 100 can be handled on the NW 400 side. It shall be.

FIG. 13 is a sequence diagram illustrating an operation example in the wireless communication system 10 according to the third embodiment.

The NW 400 and the mobile device 100 negotiate a switching parameter and a threshold value (S50).

For example, when the mobile device 100 uses the “block error rate” as a switching parameter, it is confirmed whether or not the “block error rate” can be used with the NW 400 by negotiation, and the result that the NW 400 can use the result is confirmed. When obtained, this “block error rate” is used as a switching parameter.

For example, some mobile devices 100 may not support “block error rate” as a parameter for stream switching. The mobile device 100 can set the switching parameter corresponding to the mobile device 100 by negotiating with the NW 400 what kind of switching parameter should be used.

As the switching parameter, for example, CQI or operating frequency may be used. Details will be described later.

Such negotiation is performed between the RRC 161 of the mobile device 100 and the RRC 340 of the RNC 300, for example. In this case, for example, the following processing is performed.

That is, when the first and second

BLER measurement units

118 and 119 receive a message transmitted / received between the

RRC

161 and 340 from the decoding unit 117, the first and second

BLER measurement units

118 and 119 notify the switching control unit 120 to that effect. Upon receiving the notification, the switching control unit 120 accesses the parameter holding unit 123, reads the switching parameter and the threshold stored in the parameter holding unit 123, and sends them to the first and second

BLER measurement units

118 and 119. Output and instruct to include in the message. The first and second

BLER measurement units

118 and 119 include the switching parameter and the threshold value received from the switching control unit 120 in the message and output them to the MAC unit 130. When the RRC 161 receives a message including a switching parameter and a threshold value from the PDCP unit 150, the RRC 161 transmits a message including the switching parameter and the threshold value to the NW 400.

On the other hand, when the RNC 300 receives the message including the switching parameter and the threshold value transmitted from the mobile device 100, the RRC 340 accesses the parameter holding unit 350, and the switching parameter transmitted from the mobile device 100 is in the parameter holding unit 350. Check whether or not. Then, when the RRC 340 confirms that the switching parameter received from the mobile device 100 exists in the parameter holding unit 350, the RRC 340 approves that the switching parameter and the threshold are used for stream switching determination. The RRC 340 stores the approved switching parameter and threshold value in the parameter holding unit 350. In addition, RRC 340 generates a message including approval and transmits the message to RRC 161 of mobile device 100.

When the RRC 161 of the mobile device 100 receives the message, it notifies the switching control unit 120 that the switching parameter and the threshold are approved. Upon receiving this notification, the switching control unit 120 stores the approved switching parameter and threshold value in the parameter holding unit 123.

Thereby, it is possible to perform stream switching determination between the mobile device 100 and the RNC 400 using the same switching parameter and the same threshold value.

On the other hand, when the switching parameter received from mobile device 100 is not stored in parameter holding unit 350, RRC 340 of RNC 300 generates a message instructing other switching parameters to be sent to RRC 161 of mobile device 100. Send. When receiving the notification that the message has been received from the first and second

BLER measuring units

118 and 119, the switching control unit 120 of the mobile device 100 reads the other switching parameters from the parameter holding unit 123 and reads the message. The first and second

BLER measurement units

118 and 119 are instructed to be included. As a result, other switching parameters are transmitted to the RNC 300 and can be approved.

When the negotiation is completed (S50), communication of a plurality of streams is performed between the mobile device 100 and the NW 400 (S51).

Next, the mobile device 100 determines whether to switch to one stream (S52). For example, the switching control unit 120 of the mobile device 100 performs switching determination processing for one stream. *

FIG. 14 is a flowchart showing an operation example of the switching determination process.

When the mobile device 100 starts the switching determination process (S520), the mobile device 100 determines the communication state (S521).

For example, the switching control unit 120 determines whether a multi-stream communication or a single-stream communication is being performed based on a notification from the RRC 161. In this example, the switching control unit 120 determines that a multi-stream communication is being performed.

When the communication state is a plurality of streams (“multiple streams” in S521), the mobile device 100 determines whether to switch to one stream or continue the communication of the plurality of streams based on the switching parameter negotiated with the NW 400 and the threshold value. (S522).

For example, when the switching parameter is a block error rate, the switching control unit 120 determines that one of the first and second block error rates measured by the first and second

BLER measurement units

118 and 119 is equal to or less than a threshold value. Is determined to switch to 1 stream (“1 stream” in S522, S523).

On the other hand, when any reception quality exceeds the threshold, the switching control unit 120 determines to continue communication using a plurality of streams (“multiple streams” in S522). The determination criteria are the same as those in the second embodiment, for example.

At this time, the mobile device 100 transmits the measured first and second block error rates to the NW 400. For example, the switching control unit 120 outputs the first and second block error rates to the CQI generation unit 171, and the CQI generation unit 171 transmits the NQ 400 together with the CQI.

When the mobile station switching detection unit 310 of the RNC 300 receives the first and second block error rates via the first and second base stations 200-1 and 200-2, A switching determination process is performed.

FIG. 15 is a flowchart showing an example of the switching determination process performed by the RNC 300.

When the RNC 300 starts processing (S530), it determines the communication state (S531). For example, the RRC 340 determines the communication state. In the example of FIG. 13, since communication is performed using a plurality of streams, it is determined that the communication state is a plurality of streams (“multiple streams” in S531).

Next, the RNC 300 determines whether to switch to one stream or to continue communication of a plurality of streams based on the switching parameter negotiated with the mobile device 100 and the threshold (S532).

The RNC 300 determines to switch to one stream as follows, for example. That is, the RRC 340 receives the first and second block error rates transmitted from the mobile device 100 and notifies the switching control unit 320 of the first and second block error rates. The switching control unit 320 reads the negotiated threshold value from the parameter holding unit 350 with respect to the first and second block error rates received from the RRC 340, and one of the first and second block error rates is lower than the threshold value. It is determined whether or not. When any of the first and second block error rates is lower than the threshold value, the switching control unit 320 determines to switch to one stream (“1 stream” in S532, S533), and both are threshold values. When the number exceeds, communication of a plurality of streams is continued (“multiple streams” in S532).

In this case, the RNC 300 holds the same switching parameter and threshold as the mobile device 100 by negotiation. Further, the RNC 400 receives the first and second block error rates from the mobile device 100. Therefore, the RNC 300 and the mobile device 100 obtain the same determination result (S532). Thereby, for example, both the mobile device 100 and the RNC 300 can share or synchronize the decision to switch to one stream.

Then, the RNC 300 ends a series of processes (S535).

Returning to FIG. 14, in the mobile device 100, when switching to one stream is determined (S523), as in the second embodiment, the power to unused circuits is turned off (S524), and a series of processing ends (step S524). S525).

On the other hand, when the mobile device 100 determines to continue communication of a plurality of streams (“multiple streams” in S522), the mobile device 100 ends the series of processes without performing an operation on the power supply (S525).

Returning to FIG. 13, next, the mobile device 100 notifies the MAC unit 130 of switching to one stream (S54), turns off unused circuits, and starts receiving one stream (S55). Thereafter, communication by one stream is started between the mobile device 100 and the NW 400 (S56).

Next, the mobile device 100 performs switching determination processing to a plurality of streams (S58). The RNC 300 also performs switching determination processing for a plurality of streams based on the first and second block error rates received from the mobile device 100 (S59).

An example of the switching determination process in the mobile device 100 is shown in FIG. 14, for example. When the communication state is a one-stream state (“one stream” in S521), the mobile device 100 determines whether to recover to a plurality of streams or to maintain one-stream communication based on the negotiated switching parameter and threshold ( S526).

For example, the first or second

BLER measurement unit

118 or 119 may notify the broadcast signal or the reference signal transmitted from the stopped stream side base station (first or second base station 200-1 or 200-2). The first or second block error rate is measured for and the switching control unit 120 is notified. The switching control unit 120 reads the negotiated threshold value from the parameter holding unit 123 and determines whether or not the first or second block error rate exceeds the threshold value. This determination itself is the same as that of the second embodiment, for example.

At this time, the mobile device 100 transmits the measured first or second block error rate to the NW 400 together with the CQI.

When the mobile device 100 determines to switch to a plurality of streams (“multiple streams” in S526, S527), the mobile device 100 turns on the power of the unused circuit whose power is turned off (S528), and ends the series of processing. . On the other hand, when the mobile device 100 determines to continue the 1-stream communication (“1 stream” in S526), the mobile device 100 ends the series of processes without performing any operation on the power supply (S525).

Returning to FIG. 13, when the mobile device 100 decides to switch to a plurality of streams, it notifies the MAC unit 130 to that effect (S60), turns on the power of the unused circuit, and starts receiving a plurality of streams. (S61).

On the other hand, the RNC 300 also performs switching determination processing to a plurality of streams (S59). The switching determination process in the RNC 300 is shown in FIG. 15, for example.

When the communication state is the one stream state (“1 stream” in S531), the RNC 300 performs recovery to a plurality of streams based on the switching parameter and the threshold value negotiated with the mobile device 100, or performs one stream communication. It is determined whether or not to continue (S536).

In this case, the RNC 300 determines based on the first or second block error rate received from the mobile device 100. This determination itself (S536) is the same as the determination in the mobile device 100 (for example, S526 in FIG. 14). This is because the RNC 300 holds the same switching parameters and threshold values as those of the mobile device 100 by negotiation, and further receives the first or second block error rate from the mobile device 100.

When the RNC 300 determines that a plurality of streams are restored (“multiple streams” in S536), the RNC 300 starts communication of the plurality of streams (S537) and ends a series of processes (S535). On the other hand, when the RNC 300 determines to continue the one-stream communication (“1 stream” in S536), the RNC 300 continues the one-stream communication and ends a series of processes (S535).

As described above, in the third embodiment, the switching parameter and the threshold value are negotiated in advance between the NW 400 and the mobile device 100, and stream switching is determined based on the negotiated switching parameter and threshold value.

For example, when stream switching is determined with uniform switching parameters, a mobile device 100 that does not support such switching parameters may not be able to perform switching determination. However, in the wireless communication system 10, since the switching parameter is negotiated in advance between the mobile device 100 and the NW 400, the stream can be switched using the switching parameter corresponding to the mobile device 100.

Also, a threshold value used for switching determination is also negotiated between the mobile device 100 and the NW 400. For example, in the mobile device 100, wireless characteristics may also change due to component characteristics, component deterioration, or the like. In the mobile device 100, the threshold value is changed according to such wireless characteristics, and it is negotiated with the NW 400, so that it is possible to perform stream switching determination according to the wireless characteristics of each mobile device 100.

Therefore, in the third embodiment, for example, it is possible to select a switching parameter and a threshold value for each mobile device 100, and perform more optimal stream switching that matches the radio characteristics of each mobile device 100. Is possible.

Also in the third embodiment, for example, as in the second embodiment, since the mobile device 100 can turn off the power of the unused circuit by its own judgment, the power is turned on after the NW 400 judges. The consumption current can be reduced compared to the case of turning off.

In the above example, the example of the block error rate has been described as the switching parameter. Hereinafter, examples of other switching parameters will be described.

<When switching parameter is CQI>
For example, CQI may be used as a switching parameter. In this case, for example, as in the case of the block error rate, CQI is negotiated between the mobile device 100 and the RNC 300 as the switching parameter (S50 in FIG. 13).

Then, the mobile device 100 performs stream switching determination based on the negotiated CQI and the threshold (for example, FIG. 14). Also in the RNC 300, stream switching determination is performed based on the negotiated CQI and the threshold, and further, the CQI received from the mobile device 100 (for example, FIG. 15).

The measurement of CQI is performed as follows, for example. That is, the mobile device 100 measures the first and second reception quality levels corresponding to the two streams. The measurement of the first and second reception quality levels may be performed by the first and

second RXs

112 and 113, respectively, or by the first and second

BLER measurement units

118 and 119, respectively. Also good. The switching control unit 120 receives the measurement results of the first and second reception quality levels, and calculates first and second CQIs corresponding to the first and second reception quality levels, respectively. The switching control unit 120 determines stream switching based on the first and second CQIs and the threshold value. Further, the first and second CQIs calculated by the CQI generating unit 171 are transmitted to the NW 400.

For switching from one stream to multiple streams, the mobile device 100 and the RNC 300 perform the same processing as described above except that the switching index is changed from the block error rate to the CQI.

<When switching parameter is operating frequency>
The switching parameters such as the block error rate and CQI described above are measured values measured in the mobile device 100, for example. A switching parameter other than the measured value may be used. For example, the operating frequency may be used as the switching parameter. For example, there are frequency bands in which radio waves are easy to reach and frequency bands in which it is difficult to reach. For example, in the 700 to 900 MHz band, radio waves are likely to reach the target even if there are obstacles compared to higher frequency bands. Hard to reach.

Therefore, when the operating frequency belongs to the 2 GHz band or the 1.5 GHz band, the mobile device 100 performs multi-stream communication. Thereby, for example, frequency efficiency and throughput can be improved even in a frequency band in which radio waves are difficult to reach.

In addition, when the operating frequency belongs to the 700 to 900 MHz band, the mobile device 100 performs one stream communication. Thereby, for example, the current consumption of the mobile device 100 is reduced. Therefore, for example, the switch parameter to be negotiated is the operating frequency, and the threshold to be negotiated can be a frequency band for switching to one stream or a frequency band for switching to multiple streams. The operating frequency and the threshold may be different for each mobile device 100, for example.

For example, the mobile device 100 and the RNC 300 determine, by negotiation, that one stream is used when the operating frequency belongs to the 700 to 900 MHz band, and that there are multiple streams when the operating frequency belongs to the 1.5 GHz band or the 2 GHz band. It hold | maintains at the holding parts 123 and 350 (for example, S50 of FIG. 13).

The mobile device 100 receives notification from the RNC 300 and the first and second base stations 200-1 and 200-2 about the operating frequency at the start of communication, and if the operating frequency belongs to the 700 to 900 MHz band, Communication is performed, and the power of the unused circuit is turned off (for example, “1 stream” in S522 in FIG. 14, S523 to S524). On the other hand, when the reference frequency belongs to the 1.5 GHz band or the 2 GHz band, the mobile device 100 performs multi-stream communication and turns on the power of the unused circuit (for example, “multiple streams” in S522 of FIG. 14).

Since the information about the operating frequency used by the mobile device 100 is also obtained by the RNC 300, one-stream communication or multiple-stream communication can be determined according to the negotiated frequency band. Can be synchronized.

<When switching parameter is CH transition>
For example, channel transition may be used as a switching parameter. The channel transition represents a state such as whether the mobile device 100 is on standby or not.

For example, when the mobile device 100 is on standby, communication is performed in one stream in order to suppress current consumption of the mobile device 100, and when the mobile device 100 is not on standby, multi-stream communication is performed.

The mobile device 100 shifts to the sleep mode by transmitting a specific signal to the first or second base stations 200-1 and 200-2 under certain conditions, for example. For example, the mobile device 100 that has shifted to the sleep mode is on standby. The standby mobile device 100 periodically receives a specific signal from, for example, the first or second base station 200-1 or 200-2, and confirms communication addressed to itself.

Specifically, the mobile device 100 is activated by periodically receiving Enhanced_Cell_PCH from the first or second base station 200-1 or 200-2 during standby, and the Check for presence.

Therefore, for example, when this Enhanced_Cell_PCH is received, the mobile device 100 performs 1-stream communication assuming that it is on standby, and turns off the power of unused circuits. On the other hand, when not receiving Enhanced_Cell_PCH for a certain period, mobile device 100 assumes that it is not in standby and performs multi-stream communication and turns on power to unused circuits.

For example, the mobile device 100 and the RNC 300 negotiate whether to perform 1-stream communication or multi-stream communication depending on whether or not Enhanced_Cell_PCH is received, and share information with each other. Then, the mobile device 100 performs one-stream communication or multiple-stream communication depending on whether or not the Enhanced_Cell_PCH is received, and whether or not the RNC 300 (or the first and second base stations 200-1 and 200-2) transmits the Enhanced_Cell_PCH. Switch. Thereby, the switching determination can be synchronized between the mobile device 100 and the NW 400.

For example, a signal other than Enhanced_Cell_PCH may be used as long as it is a signal for confirming reception to mobile device 100 in the sleep mode.

In this example, the switch parameter to be negotiated is a signal for confirming such reception, and the threshold value to be negotiated can indicate how to switch streams depending on the presence or absence of the signal.

In the foregoing, a plurality of examples of switching parameters have been described. For example, the switching parameter to be used is determined by negotiation. For example, the mobile device 100 can notify that there is no HSDPA function by negotiation, or can notify the available radio frequency band by negotiation. For example, when the RNC 300 receives a notification that there is no HSDPA function, it uses BLER instead of CQI as a switching parameter. Further, for example, when the RNC 300 receives a notification that the 700-900 MHz band cannot be used and the 1.5 GHz band or the 2 GHz band can be used, the RNC 300 can be operated with a normal one stream.

[Other embodiments]
In the second and third embodiments, the example of two streams as a plurality of streams has been described, and the switching of streams has also been described from two streams to one stream or vice versa. For example, the stream can be switched from 3 streams to 2 or 1 stream, or from 4 streams to 3, 2 or 1 stream. For example, when the mobile device 100 communicates with a plurality of streams and performs wireless communication by switching to a stream having a smaller number of streams, the number of streams before and after the switching is not limited.

In this case, the mobile device 100 may be provided with RX and BLER measurement circuits corresponding to the number of streams, and the despreading unit 116 and the decoding unit 117 may include a circuit corresponding to the number of streams.

In addition, the De-MUX 330 of the RNC 300 can transmit data of 3 streams or more to the mobile device 100 by separating the transmission data into data of 3 or more streams. In this case, the number of base stations corresponding to the number of streams is also arranged in the base station, and each base station transmits each stream using a different carrier, so that three or more streams of data can be transmitted to the mobile device 100.

As described above, even when the maximum number of streams is “3” or more, the mobile device 100 can determine to reduce the number of streams based on its own judgment, and can turn off the power of unused circuits. Therefore, as described above, the mobile device 100 can reduce current consumption. *

In the second and third embodiments, the description has been given of the switching of the stream, mainly turning on or off the power of unused circuits for the receiving unit 110. For example, regarding switching to one stream, not only the reception unit 110 but also the power of unused circuits in the transmission unit 170 can be turned off.

FIG. 16 is a diagram illustrating a configuration example of the transmission unit 170 when two-stream transmission is performed. The transmission unit 170 includes an L1 unit 172 and an RF unit 173. The L1 unit 172 includes a CQI generation unit 171, an encoding unit 175, and a modulation unit 176, and the RF unit 173 includes first and

second TXs

177 and 178.

In this case, for example, the circuit that processes the first stream of the encoding unit 175, the circuit that processes the first stream of the modulation unit 176, and the first TX 177 are circuits that process the first stream. A circuit for processing the first stream corresponds to, for example, the first processing unit 190 in the first embodiment.

Also, for example, the circuit that processes the second stream of the encoding unit 175, the circuit that processes the second stream of the modulation unit 176, and the second TX 178 are circuits that process the second stream. The circuit that processes the second stream corresponds to, for example, the second processing unit 191 in the second embodiment. Each circuit is indicated by a dotted line in FIG. 16, for example.

For example, the first stream is transmitted using the first carrier (or the first frequency band), and the second stream is transmitted using the second carrier (or the second frequency band).

In this case, the first stream is generated by, for example, a circuit that processes the first stream, and is transmitted to the first base station 200-1. Also, the second stream is generated by, for example, a circuit that processes the second stream, and is transmitted to the second base station 200-2. In the configuration of the transmission unit 170, for example, a circuit portion for processing each stream is added according to the number of streams.

When switching to one stream is performed, the power control unit 121 turns off the power of the circuit that processes either the first stream or the second stream whose reception quality has deteriorated. For example, when stopping the reception of the first stream, the power supply control unit 121 selects a circuit that processes the first stream (a circuit that processes the first stream of the encoding unit 175 and a first stream of the modulation unit 176). The processing circuit and the first TX 177) are turned off. In addition, when switching to a plurality of streams is performed, the power control unit 121 turns on power to unused circuits that have been powered off.

Thereby, for example, it is possible to reduce the current consumption of the mobile device 100 not only for downlink communication but also for uplink communication.

Furthermore, in the above-described example, an example in which two base stations 200-1 and 200-2 transmit two streams when the base station 200 transmits two streams has been described. For example, a plurality of streams may be transmitted from one base station 200. For example, in carrier aggregation, the base station 200 can perform wireless communication using a plurality of frequency bands, and thus one base station 200 can transmit a plurality of streams. Even when the mobile device 100 transmits a plurality of streams, for example, one base station 200 may receive the plurality of streams.

FIG. 17 to FIG. 19 are diagrams illustrating hardware configuration examples of the mobile device 100, the base station 200, and the RNC 300, respectively.

The mobile device 100 includes a RAM (Random Access Memory) 180, a CPU (Central Processing Unit) 181, a DSP (Digital Signal Processor) 182, first and second

wireless processing units

183 and 184, a reception antenna 185, and a transmission antenna 186. Prepare.

The CPU 181 executes the program stored in the RAM 180 to thereby generate the first and second

BLER measurement units

118 and 119, the switching control unit 120, the power supply control unit 121, and the CQI generation in the second and third embodiments. Functions of the unit 171, the MAC unit 130, the RLC unit 140, the PDCP unit 150, and the application unit 160 are executed. Accordingly, the CPU 181 includes, for example, the first and second

BLER measurement units

118 and 119, the switching control unit 120, the power control unit 121, the CQI generation unit 171, the MAC unit 130, and the RLC in the second and third embodiments. Corresponds to the unit 140, the PDCP unit 150, and the application unit 160.

Further, the CPU 181 outputs an execution instruction to the DSP 182, so that the DSP 182 executes the functions of the despreading unit 116, the decoding unit 117, and the transmission unit 170 in the L1 unit 115. Accordingly, the DSP 182 corresponds to, for example, the despreading unit 116, the decoding unit 117, and the transmission unit 170 in the second and third embodiments.

Further, for example, the first wireless processing unit 183 corresponds to the RF unit 111 in the second and third embodiments, and the second wireless processing unit 184 is the transmission unit 170 in the second and third embodiments. Corresponding to

Furthermore, the reception antenna 185 and the transmission antenna 186 correspond to, for example, the antenna 101 in the second and third embodiments.

Note that the RAM 180 corresponds to, for example, the parameter holding unit 123 in the third embodiment.

The base station 200 includes a RAM 270, a CPU 271, a DSP 272, first and second

wireless processing units

274 and 275, a transmission antenna 276, and a reception antenna 277.

The CPU 271 reads out and executes a program stored in the RAM 270 or the like, thereby executing the first and second MAC units 220-1 and 220-2, the first and second in the second and third embodiments. The functions of the RLC units 230-1 and 230-2 and the first and second PDCP units 240-1 and 240-2 are executed. Accordingly, the CPU 271 includes, for example, the first and second MAC units 220-1 and 220-2, the first and second RLC units 230-1 and 230-2, and the first and second PDCP units 240-1. , 240-2.

The DSP 272 also includes, for example, the first and second receiving units 210-1 and 210-2, the first and second encoding units 251-1 and 251-2, the second and third embodiments, and the second and third embodiments. This corresponds to the first and second modulators 252-1 and 252-2. Further, for example, the first wireless processing unit 274 corresponds to the first and second TX 253-1 and 253-2 in the second and third embodiments, and the second wireless processing unit 275 This corresponds to the first and second receiving units 210-1 and 210-2 in the second and third embodiments. *

The RNC 300 includes a ROM (Read Only Memory) 360, a RAM 361, a memory 362, and a CPU 363. The CPU 363 reads out the program stored in the ROM 360, loads it into the RAM 361, and executes the loaded program, whereby the mobile device switching detection unit 310, the switching control unit 320, and the De-MUX 330 in the second and third embodiments. , And the function of RRC340. Therefore, the CPU 363 corresponds to, for example, the mobile device switching detection unit 310, the switching control unit 320, the De-MUX 330, and the RRC 340 in the second and third embodiments.

Further, the memory 362 corresponds to, for example, the parameter holding unit 350 in the third embodiment.

In the hardware configuration example described above, the

DSPs

182 and 272 and the CPU 363 can be replaced with FPGA (Field Programmable Gate Array) or MPU.

10: wireless communication system 100 (100-1, 100-2): mobile device 100: base station apparatus (base station) 110: receiving unit 111: RF unit 112, 113: first and second RX
115: L1 unit 116: Despreading unit 117: Decoding unit 118, 119: First and second BLER measurement unit 123: Parameter holding unit 131: MUX
161: RRC 170: transmitting unit 171: CQI generating unit 200 (200-1, 200-2): base stations 210-1, 210-2: first and second receiving units 250-1, 250-2: first 1st and 2nd transmission unit 300: RNC 310: mobile station switching detection unit 320: switching control unit 330: De-MUX
340: RRC 350: Parameter holding unit 400: NW 181

Claims

In a mobile station device that performs radio communication with a base station device using a frequency band,
A first processing unit for processing a first data stream transmitted or received using a first frequency band;
A second processing unit for processing a second data stream transmitted or received using the second frequency band;
When it is determined to switch the frequency band from the first and second frequency bands to the first frequency band based on a different index for each mobile station apparatus, wireless communication is performed with the base station apparatus. A switching control unit for turning off the power of the second processing unit without
A mobile station apparatus comprising:
The mobile station apparatus according to claim 1, wherein the index different for each mobile station apparatus is a reception quality when a radio signal transmitted from the base station apparatus is received.
The mobile station apparatus according to claim 1, wherein the switching control unit determines a different index for each mobile station apparatus by negotiation with the base station apparatus.
The switch control unit further determines a threshold value indicating whether or not to switch to the first frequency band for the index by negotiation with the base station device. 3. The mobile station apparatus according to 3.
The mobile station apparatus according to claim 4, wherein the index different for each mobile station apparatus is a reception quality when a radio signal transmitted from the base station apparatus is received.
The mobile station apparatus according to claim 5, wherein the switching control unit transmits the measured reception quality to the base station apparatus.
The index different for each mobile station apparatus is a frequency band to which the first and second frequency bands belong, and the threshold indicates the frequency band when switching to the first frequency band. 4. The mobile station apparatus according to 4. *
A different index for each mobile station apparatus is a signal for confirming reception to the mobile station apparatus in the sleep mode, and the threshold indicates whether or not the signal is present when switching to the first frequency band. The mobile station apparatus according to claim 4, wherein:
When the switching control unit determines to switch from the first and second frequency bands to the first frequency band, the switching control unit notifies the base station apparatus of a switching advance notice indicating switching to the first frequency band. The mobile station apparatus according to claim 1, wherein the mobile station apparatus transmits the mobile station apparatus.
When the switching control unit determines to switch from the first and second frequency bands to the first frequency band, the switching control unit displays a switching instruction pattern indicating the number of data streams after switching or the number of frequency bands after switching. The mobile station apparatus according to claim 1, wherein the mobile station apparatus transmits to the base station apparatus.
Further, after the decision to switch to the first frequency band, even if the second data stream is received from the mobile station apparatus, a negative response indicating that the second data stream cannot be received is sent to the base station. The mobile station apparatus according to claim 1, further comprising a controller that transmits to the apparatus. *
After transmitting the negative response, the first processing unit receives the first data stream from the base station device, and the second processing unit does not receive the second data stream from the base station device. The mobile station apparatus according to claim 11.
The switching control unit, after turning off the power of the second processing unit, changes the frequency band from the first frequency band to the first and second frequency bands based on a different index for each mobile station device. 2. The mobile station apparatus according to claim 1, wherein when it is decided to switch to the second station, the power of the second process is turned on without performing wireless communication with the base station apparatus.
When the switching control unit determines to switch from the first frequency band to the first and second frequency bands, the switching control unit notifies the base station of a switching advance notice indicating switching to the first and second frequency bands. The mobile station apparatus according to claim 13, wherein the mobile station apparatus transmits to the station apparatus.
When the switching control unit determines to switch from the first frequency band to the first and second frequency bands, the switching control unit displays a switching instruction pattern indicating the number of data streams after switching or the number of frequency bands after switching. The mobile station apparatus according to claim 13, wherein the mobile station apparatus transmits to the base station apparatus.
The switching control unit determines to switch the frequency band from the first and second frequency bands to the first frequency band when detecting that the reception quality is deteriorated below a threshold value. The mobile station apparatus according to claim 2, wherein:
The switching control unit switches the frequency band from the first and second frequency bands to the first frequency band when detecting that the negotiated indicator is degraded from the negotiated threshold value. The mobile station apparatus according to claim 4, wherein the mobile station apparatus is determined.
When the switching control unit determines to switch the frequency band from the first and second frequency bands to the first frequency band based on a different index for each mobile station apparatus, The mobile station apparatus according to claim 1, wherein the first processing unit is turned on without performing wireless communication.
The base station device includes first and second base station devices,
The mobile station apparatus according to claim 1, wherein the first and second data streams are transmitted from the first and second base station apparatuses, respectively.
A first processing unit for processing a first data stream transmitted or received using a first frequency band; and a second processing unit for processing a second data stream transmitted or received using a second frequency band. 2 is a power control method for a mobile station apparatus that performs wireless communication with a base station apparatus.
When the switching control unit decides to switch the frequency band from the first and second frequency bands to the first frequency band based on an index different for each mobile station apparatus, between the base station apparatus A power control method characterized by turning off the power of the second processing unit without performing wireless communication.
A base station device;
A base station control device for controlling the base station device;
In a radio communication system comprising a mobile station apparatus that performs radio communication with the base station apparatus using a frequency band,
The mobile station device
A first processing unit for processing a first data stream transmitted or received using a first frequency band;
A second processing unit for processing a second data stream transmitted or received using the second frequency band;
When it is determined to switch the frequency band from the first and second frequency bands to the first frequency band based on a different index for each mobile station apparatus, wireless communication is performed with the base station apparatus. A wireless communication system, comprising: a switching control unit that turns off the power of the second processing unit.
When the switching control unit decides to switch to the first frequency band, the switching control unit notifies the base station control device via the base station device of a switching notice of notification indicating switching to the first frequency band. Send
The mobile station apparatus further includes a controller that transmits a negative response indicating that the second data stream could not be received to the base station apparatus after determining to switch to the first frequency band,
The base station control device further has a frequency band based on the number of negative responses received from the mobile station device via the base station device when the switching notice is received via the base station device. 21. The radio communication system according to claim 20, further comprising: a mobile station switching detection unit (340) that switches the first to second frequency bands from the first and second frequency bands.
When the switching control unit determines to switch from the first and second frequency bands to the first frequency band, the switching control unit determines the number of data streams after switching or the number of frequency bands after switching. The switching instruction pattern shown is transmitted to the base station device,
The base station controller further changes the frequency band from the first and second frequency bands to the first frequency band according to the switching instruction pattern when the switching instruction pattern is received via the base station apparatus. 21. The wireless communication system according to claim 20, further comprising a mobile unit switching detection unit (340) for switching.
In a mobile station device that performs radio communication with a base station device using a frequency band,
A first circuit for processing a first data stream transmitted or received using a first frequency band;
A second circuit for processing a second data stream transmitted or received using the second frequency band;
When it is determined to switch the frequency band from the first and second frequency bands to the first frequency band based on a different index for each mobile station apparatus, wireless communication is performed with the base station apparatus. A controller for turning off the power of the second processing unit without
A mobile station apparatus comprising: