JP2001359138A - Wireless mobile station unit and wireless base station unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the time required for switching base stations between two cells of a mobile station adopting the CDMA/TDD system. SOLUTION: A reception power detection circuit 13 monitors reception power of a transmission wave from a peripheral base station and two correlation devices (correlation devices 5 and 6) obtain correlation data and obtain decoded data 12 for the simultaneous communication with a master base station and a slave base station around a border of two cells attended with the movement of the mobile station. A control circuit 19 transmits control information to allow the slave base station to receive a transmission wave to the master base station so that the two base stations receive the same signal. In this case, the control circuit 19 sends a control signal to an RF transmission section 18 and a coder 15 for the transmission power control and the time alignment to the main base station. In the switching between the master base station and the slave base station, since the mobile station communicates with them, no synchronization acquisition is required resulting in reducing the time required for the transmission power control and the time alignment or the like thereby attaining high speed base station switching.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio mobile station apparatus and a radio base station apparatus using a spread spectrum system used for digital radio communication such as an automobile telephone and a portable telephone.

[0002]

2. Description of the Related Art In a cellular radio system such as an automobile telephone and a portable telephone, a plurality of stations simultaneously communicate in the same frequency band as a multiple access method of a transmission signal.
Although the FDMA system and the TDMA system are known, in recent years, the CDMA system (code division multiple access) has been used as a system that can achieve higher frequency utilization and accommodate more users as compared with the FDMA system and the TDMA system. Method) has been adopted.

[0003] There are an FDD system and a TDD system as transmission systems for transmitting transmission data in both directions of uplink and downlink between a mobile station and a base station in a cellular system. The FDD scheme uses different frequency bands for uplink and downlink, and the TDD scheme uses the same frequency band to transmit uplink and downlink in a time-division manner. Therefore, the CDMA / TDD system processes signals transmitted by the CDMA system, and performs transmission on the uplink and downlink by the time division multiplexing (TDD).

FIG. 3 shows a conventional CDMA / TDD spread spectrum communication apparatus. FIG. 3 is a block diagram showing a configuration of a mobile station of a conventional CDMA / TDD spread spectrum communication apparatus. Hereinafter, the configuration of the mobile station of the conventional CDMA / TDD spread spectrum communication apparatus will be described with reference to FIG.

In FIG. 3, reference numeral 20 denotes an antenna for receiving radio waves, 21 a switch for switching between transmission and reception of an RF signal, 22 an RF receiver for converting a received RF signal into a baseband signal, and 23 a baseband. An AD converter for quantizing the signal of the above, 24 is a correlator for despreading the A / D converted data and outputting correlation value data, 25 is a decoder for decoding the correlation value data, and 26 is a synchronization with the correlator 24. A synchronization circuit that outputs a signal and outputs a frame synchronization signal to the timing generation circuit 27, and a timing generation circuit 27 that controls the switching operation of the switch 21 by controlling the frame synchronization signal.

Reference numeral 30 denotes an encoder for assembling a frame structure of transmission data and control data and performing error correction encoding on the transmission data 29; 32, a D / A converter for converting the spread spectrum multiplexed digital data into an analog signal; 33, an RF transmitter for converting the spread spectrum multiplexed analog signal into an RF signal; 34, transmission power of the RF signal Is a transmission power control circuit for controlling the transmission power.

Reference numeral 34 denotes a transmission power control circuit for controlling the transmission power of the RF transmission unit 33 based on a control signal from a control circuit 35, and 35 extracts control data from the decoded data and sends a control signal to the transmission power control circuit 34. Control the transmission power and transmit the control data to be transmitted to the encoder 30.
Is a control circuit that outputs to the control circuit.

Hereinafter, referring to FIG. 3, a conventional CDMA / CDMA
The operation of the mobile station of the TDD spread spectrum communication apparatus will be described. On the receiving side of FIG.
Receives the radio wave of the RF signal transmitted from the communication destination device, and the switch 21 switches to reception in order to input the RF signal received by the antenna 20 and receives it. RF receiver 22
Converts or detects the received RF signal into a baseband signal and outputs the signal to the AD converter 23. The AD converter 23 quantizes the baseband signal and outputs it to the correlator 24 and the synchronization circuit 26. The correlator 24 despreads the AD-converted data using the synchronization signal from the synchronization circuit 26 and outputs correlation value data to the decoder 25. The decoder 25 decodes the correlation value data and outputs decoded data 28. I do.

At this time, the decoded data 28 is also output to the control circuit 35 and the synchronization circuit 26, and the synchronization circuit 26
A chip synchronization and a symbol synchronization are obtained from the output of the D converter 23, a synchronization signal is output to the correlator 24, a frame synchronization signal is generated from the decoded data 28, and output to the timing generation circuit 27. The timing generation circuit 27 controls the switching of the RF signal in the switch 21 by controlling the frame synchronization signal.

On the transmitting side in FIG. 3, an encoder 30 assembles a frame configuration of transmission data and control data based on a control signal from a control circuit 35, and performs error correction encoding on the transmission data 29 to perform spread multiplexing. Circuit 31
Output to The spread multiplexing circuit 31 multiplexes each channel for transmitting the spread spectrum of the encoded data, and
Output to the A converter 51. The DA converter 32 converts the spread spectrum multiplexed digital data into an analog signal and outputs the analog signal to the RF transmitter 33. The RF transmitter 33 converts or modulates the spread spectrum multiplexed analog signal into an RF signal.

Therefore, the transmission power control circuit 34 controls the transmission power of the RF transmission unit 33 based on the control signal from the control circuit 35, and the switch 21 switches the transmission and the reception to the transmission, and
The F signal is output from the antenna 20. The control circuit 3
5 extracts control data from the decoded data, sends a control signal to the transmission power control circuit 34 to control the transmission power, and outputs control data to be transmitted to the encoder 30.

The conventional CDMA / TDD shown in FIG.
Mobile station, the antenna 20 and the RF receiver 2
2. Receives and decodes a transmission signal from a base station through an AD converter 23, a correlator 24, and a decoder 25;
0, spreading multiplexing circuit 31, DA converter 32, RF transmitting unit 3
3. Data is transmitted to the base station through the antenna 20. At that time, transmission and reception are switched by the frame synchronization signal. As described above, even in the above-mentioned conventional CDMA / TDD mobile station, communication is possible within a range where radio waves can reach one base station. In addition, communication with another base station was also possible by controlling the control circuit 35 for controlling the entire apparatus to switch the transmission / reception frequency or the spread code used for transmission / reception.

[0013]

However, in the conventional CDMA / TDD spread spectrum communication apparatus, the base station must be switched as the mobile station moves. There was no over method. Therefore, in the above-described conventional example, when the mobile station enters another base station, there is a problem that the base station cannot be quickly switched and the communication must be temporarily suspended.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. When a mobile station of a CDMA / TDD spread spectrum communication apparatus moves, a user, ie, a user,
The base station can be switched in a short time without any influence on the switching of the base station with respect to the mobile station, and the transmission characteristics do not deteriorate even when the mobile station is near the boundary between two cells. An object is to provide a spread communication device.

[0015]

SUMMARY OF THE INVENTION A radio mobile station apparatus according to the present invention is provided with a means for monitoring a reception state of a radio wave (RF signal) from a base station in the vicinity of the mobile station. A means for transmitting control information for simultaneously communicating with a base station (called a main base station) and another base station (called a subordinate base station) to the main base station is provided. The radio wave transmitted from the main base station and the radio wave transmitted from the main base station are received at the same time, and a means for transmitting the same radio wave to the main base station and the slave base station is provided to perform simultaneous communication.

At this time, transmission power control and time alignment for the main base station (the deviation of the arrival time of the transmission burst between the mobile stations having different distances from the base station to the base station is adjusted by adjusting the transmission timing of each mobile station). Correction). When the reception state of the slave base station becomes better than that of the master base station from this state, the base station includes means for switching between the two base stations, that is, the master base station and the slave base station. If the condition is good, a control signal for switching to communication with only the main base station is transmitted to switch the base station so as to communicate with only the main base station. With this configuration, the base station is switched from a state in which the mobile station is simultaneously communicating with the master base station and the slave base station, so that synchronization acquisition for despreading, transmission power control, time Processing such as alignment can be performed in a short time, and the time required for base station switching can be reduced. This is because while the base station serving as the master base station is communicating as the slave base station, the reception status at the slave base station and information necessary for time alignment can be obtained.

According to the present invention, switching of a base station, which occurs as the CDMA / TDD wireless mobile station apparatus moves, can be performed in a short time without affecting the switching of the base station. In addition, even when the mobile station is near the boundary between two cells, it is possible to obtain a wireless mobile station device whose transmission characteristics do not deteriorate.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A radio mobile station apparatus according to the present invention generates time alignment information using a signal transmitted from a communicating main base station and a signal transmitted from a slave base station with which communication is performed next. Time alignment information generating means, transmitting means for transmitting the alignment information to the slave base station, and handover for performing handover from the master base station to the slave base station after time alignment is performed at the slave base station And a control means.

[0019] In the radio mobile station apparatus according to the present invention, when the reception power of data from the slave base station is larger than the reception power of data from the master base station in communication, A configuration is adopted in which data is exchanged by switching to a slave base station.

According to these configurations, the switching of the base station, which occurs as the mobile station moves, can be performed in a short time, the mobile station is not affected by the switching of the base station, and the mobile station has two switches. Even when it is near the boundary between two cells, deterioration of transmission characteristics can be suppressed.

[0021] The radio base station apparatus of the present invention comprises: a receiving means for receiving time alignment information used at the time of handover transmitted from a mobile station with which the main base station is communicating;
And transmitting means for transmitting data to the mobile station in a time-aligned state based on the time alignment information.

According to this configuration, even when the mobile station is near the boundary between two cells, deterioration of transmission characteristics can be suppressed.

In the handover method according to the present invention, a step of generating time alignment information in a mobile station using a signal transmitted from a communicating main base station and a signal transmitted from a slave base station to be communicated with next. And transmitting the time alignment information from the mobile station to the slave base station, and handing over from the master base station to the slave base station after time alignment is performed at the slave base station, Is provided.

[0024] In the handover method according to the present invention, in the above method, the slave base station transmits to the mobile station in a time-aligned state based on the time alignment information.

According to these methods, switching of the base station which occurs as the mobile station moves can be performed in a short time by simple means so that the mobile station is not affected by the switching of the base station. Is near the boundary between two cells, it is possible to suppress deterioration of transmission characteristics.

Hereinafter, based on the attached drawings, FIG. 1 and FIG.
An embodiment of the present invention will be described in detail. FIG. 1 is a block diagram showing a configuration of a CDMA / TDD wireless mobile station apparatus according to an embodiment of the present invention. FIG. 2 is a base station switching operation performed when the wireless mobile station apparatus shown in FIG. 1 moves. FIG.

Referring to FIG. 1, the configuration of a CDMA / TDD wireless mobile station apparatus according to an embodiment of the present invention will be described. In FIG. 1, 1 is an antenna for receiving a radio wave, 2 is a switch for switching between transmission and reception of an RF signal to be transmitted and received, 3 is an RF receiver for converting an RF signal into a baseband signal, and 4 is a quantizer for correlating the baseband signal. A / D converters 5 and 6 for outputting to the modulator 5, the correlator 6, the synchronizing circuit 8 and the synchronizing circuit 11, respectively.
Is a correlator for despreading and correlating AD-converted received data using the spreading code selected in (1) and outputting correlation value data to the decoder 7.

Reference numeral 7 denotes a decoder which decodes correlation value data and outputs decoded data 12, and reference numerals 8 and 11 denote synchronization circuits which output synchronization signals used for despreading to the correlators 5 and 6, respectively. 8 further generates a frame synchronization signal from the decoded data 12 and outputs it to the timing generation circuit 9.
Reference numeral 9 denotes a timing generation circuit that controls the transmission / reception switching operation in the switch 2 by controlling the frame synchronization signal. Reference numeral 13 denotes a transmission signal from a base station around the mobile station based on the correlation value data output from the correlator 5 and the correlator 6. The received power detection circuit 10 monitors the power level and outputs data indicating the power level of the received transmission signal to the control circuit 19 to select or identify the master base station and the slave base station. Circuit 19
Is a spread code selection circuit that outputs a signal for selecting a spread code to be used in the correlator 5 and the correlator 6 according to the control signal.

Numeral 15 encodes error correction for the transmission data 14, assembles a frame structure of the transmission data 14 and the control data by a control signal from the control circuit 19, and encodes the frame for time alignment. An encoder that controls to shift the data output timing,
A spread multiplexing circuit 16 spreads the coded data by using a spreading code selected by a control signal from a control circuit 19 and multiplexes and outputs each channel. A spread multiplexing circuit 17 converts the spread spectrum digital data. It is a DA converter for converting to an analog signal. An RF transmitter 18 converts an analog signal into an RF signal. The RF signal is transmitted to the antenna 1 when the switch 2 is switched to transmission.
Output from

Reference numeral 19 denotes a control circuit for controlling the entire apparatus. In particular, the control circuit 19 monitors the power level of the transmission signal detected from the correlation value data in the reception power detection circuit 13 to control the main base station and the sub base station. In order to transmit the switching information to each base station, send a control signal to the encoder 15 and select the spread codes of the correlators 5 and 6 to the spread code selection circuit 10. Output a control signal for performing the operation.

Next, with reference to FIG. 1, the operation of the CDMA / TDD wireless mobile station apparatus according to one embodiment of the present invention will be described. First, the receiving operation will be described. When the switch 2 is selected for reception, the antenna 1 receives a transmission signal transmitted from the base station and outputs an RF signal. The RF receiver 3 converts the RF signal into a baseband signal and outputs the signal to the AD converter 4. The AD converter 4 quantizes the baseband signal and outputs the quantized signal to the correlator 5, the correlator 6, the synchronization circuit 8, and the synchronization circuit 11.

The correlator 5 and the correlator 6 despread the data AD-converted by the correlator for despreading the transmission signal from the base station, and the correlation value for the spreading code selected by the spreading code selection circuit 10 respectively. The data is output to the decoder 7.
At this time, synchronization is achieved by the synchronization signals output from the synchronization circuits 8 and 11. The decoder 7 decodes the correlation value data output from the correlators 5 and 6 and outputs decoded data 12.
At the time of decoding, decoded data is obtained using the correlation value data from one or both of the correlator 5 and the correlator 6 according to the control signal of the control circuit 19.

The decoded data 12 is also output to the control circuit 19 and the synchronization circuit 8. In the synchronous circuit 8, the AD converter 4
, And outputs a synchronizing signal to the correlator 5, generates a frame synchronizing signal from the decoded data 12 of the decoder 7, and outputs the frame synchronizing signal to the timing generation circuit 9. The timing generation circuit 9 controls the switch 2 based on the frame synchronization signal from the synchronization circuit 8 to switch between transmission and reception.
The switch 2 switches between transmission and reception according to a control signal of the timing generation circuit 9.

The synchronizing circuit 11 generates a synchronizing signal from the output of the AD converter 4 and outputs it to the correlator 6. The reception power detection circuit 13 monitors the reception power from the base stations around the mobile station from the outputs of the correlators 5 and 6, and outputs data indicating the magnitude of the reception power to the control circuit 19. Spreading code selection circuit 1
0 outputs a signal for selecting each spreading code to the correlators 5 and 6, according to the control signal from the control circuit 19.

Next, the transmission operation will be described. Encoder 1
5 performs error correction encoding on the transmission data 14 and transmits the transmission data 1 according to a control signal of the control circuit 19.
4 and the frame structure of control data are assembled and output to the spread multiplexing circuit 16. Further, the encoder 15 shifts the output timing of the encoded data according to the control signal of the control circuit 19 and outputs the encoded data for time alignment.
The spread multiplexing circuit 16 spreads the spectrum of the coded data, multiplexes each channel to be transmitted, and outputs the multiplexed data to the DA converter 17.

At this time, the spreading code used for spreading is selected by the control signal of the control circuit 19. DA converter 17
Converts the spread spectrum multiplexed digital data into an analog signal and outputs the analog signal to the RF transmission unit 18. The RF transmitter 18 converts the spread spectrum multiplexed analog signal into an RF signal. The RF signal is output from the antenna 1 when the switch 2 is selected for transmission. Further, the RF transmission unit 18 controls transmission power according to a control signal of the control circuit 19.

The control circuit 19 controls the entire apparatus, monitors the power of the received signal from the surrounding base stations based on the detection of the received power by the received power detection circuit 13, and controls the power of the master base station and the slave base station. In order to perform selection and transmit base station switching information to each base station, a control signal for communicating with the slave base station to the encoder 15 and a control signal for switching the functions of the master base station and the slave base station are provided. A control signal and a control signal for stopping communication with the switched slave base station are transmitted.

The control circuit 19 outputs a control signal for selecting a spreading code of the correlator 5 and the correlator 6 to the spreading code selecting circuit 10, and selects a spreading code for the spreading multiplexing circuit 16. To send a control signal to
When communicating with the slave base station, the decoder 7 sends a control signal for instructing decoding using the correlation value data of both the master base station and the slave base station, and transmits the control signal to the RF transmitter. A control signal for controlling power is transmitted. Here, the transmission power is controlled using control information sent from the base station.

Also, a control signal is sent to the encoder 15 based on the time alignment information sent from the base station to control the data transmission timing. Transmission power control and time alignment are performed on the main base station, but when the main base station and the slave base station are switched, the transmission power and time alignment information of the slave base station is received from the base station before the base station is switched. The switching between the main base station and the slave base station by the control circuit can be quickly performed based on the information.

Next, the operation of switching the base station of the mobile station will be described in detail with reference to FIG. 2 in the radio mobile station apparatus configured as described above. As shown in FIG. 2, when the mobile station is located close to the base station A, the base station A
Communicate with At that time, the mobile stations are base station A and base station B.
The base station A communicates with the base station A using the spreading code A while monitoring the magnitude of the received signal power with the received power detection circuit 13. The correlation value output of the correlator 5 is used to detect the reception power from the base station A of the communication destination, and the correlator output of the correlator 6 is used to detect the reception power from the peripheral base station. Shall be. At this time, the control circuit 19 controls transmission power control and time alignment for the base station A of the communication destination.

The mobile station gradually moves in the direction of the base station B,
As shown in FIG. 2, when the mobile station approaches the intermediate position between the base station A and the base station B and the reception power detection circuit 13 detects that the radio wave of the base station B has become strong, the mobile station starts the control circuit 1.
From 9, control information for communicating with the base station B as a slave base station is transmitted to the communicating base station A. The base station A receives the control information and sends control information to the base station B to operate the mobile station as a slave base station. The base station B receives the control information, receives the transmission signal from the mobile station, and uses the spreading code B different from the main base station A to use the base station A.
And send the same information.

The mobile station obtains correlation value data through the RF receiving unit 3, the AD converter 4, and the correlator 5 using the base station A as the main base station, and obtains the RF receiving unit 3 using the base station B as the slave base station. It operates so as to obtain correlation value data through the correlator 4 and the correlator 6. Then, decoded data 12 is obtained by using the correlation value data of the master base station A and the slave base station B. The transmission signal from the mobile station is transmitted using the spreading code of the base station A, as in the past. Transmission power control and time alignment are also performed for the main base station A. As described above, while communicating with the main base station A, communication with the slave base station B is also started.

Further, the mobile station moves in the direction of the base station B, and approaches the base station B beyond the middle between the base stations A and B as shown in FIG. When the transmission signal becomes strong, the control circuit 19 sends a control signal to the base stations A and B to make the base station A the slave base station and the base station B the master base station. The base stations A and B receive it, and the base station B transmits transmission power and time alignment control information to the mobile station for communication as the main base station. Thereafter, the base station A becomes a slave base station and obtains a received signal from the mobile station using the spreading code B.
Send using.

Base station B becomes the main base station and obtains a received signal using spreading code B, and a transmission signal is transmitted using spreading code B. The mobile station obtains correlation value data through the RF receiver 3, the AD converter 4, and the correlator 6 with the base station B as the main base station. In addition, the mobile station obtains correlation value data through the RF receiver 3, the AD converter 4, and the correlator 5 with the base station A as a slave base station.

The decoded data 12 is obtained from the correlation value data between the master base station and the slave base station. At this time, the control circuit 19 sends information to the decoder 7 that the correlation value data of the main base station B is the output of the correlator 6 and the correlation value data of the slave base station A is the output of the correlator 5. . The control circuit 19 is the spread multiplexing circuit 1
6 and the transmission signal is the spreading code B of the main base station B.
Is transmitted by using. Further, the control circuit 19 sends information on the time alignment of the base station B to the encoder 15 and controls the transmission power of the base station B to the RF transmitting unit 18 in order to control the time alignment and the transmission power for the base station B. Send control information.

In this switching of the base stations, there is no need to acquire synchronization because the base stations A and B have already been synchronized, and the control information of the transmission power and the control information of the time alignment are transmitted by the base station B to the slave base station. Since the communication has already been transmitted from the base station to the mobile station from the time of the communication at the time, the switching of the base station is completed in a short time.

Further, when the mobile station moves in the direction of the base station B and is located near the base station B as shown in FIG. 2, the mobile station communicates only with the main base station B, and A control signal for stopping communication with the station A is sent from the control circuit 19 to the base station B. With this signal, the base station A stops the operation of the slave base station.

The characteristics of the radio mobile station according to the present embodiment and the characteristics of the conventional radio mobile station are compared in the following [Table 1].

[0049]

[Table 1]

As is apparent from Table 1, the radio mobile station apparatus according to the embodiment of the present invention can reduce the time required for switching between base stations due to movement. Further, a result is obtained in which the transmission characteristics when the mobile station is located far from the base station, such as near the boundary between two cells, are better than the characteristic characteristics of the conventional wireless mobile station device.

As described above, according to the embodiment of the present invention, when the base station is switched according to the movement of the CDMA / TDD mobile station, the reception state of the transmission signal from the neighboring base station is determined by the received power. Monitoring by the detection circuit 13, if the radio waves of base stations other than the communicating base station become stronger, the base station (slave base station) other than the communicating base station (main base station) and the own station are simultaneously communicated. Is transmitted to the communicating main base station. Then, the transmission signals from the master base station and the slave base station are simultaneously received by the correlator 5 and the correlator 6, and the same transmission signal is transmitted to the master base station and the slave base station. afterwards,
When the reception condition of the slave base station is further improved, control information for switching between the master base station and the slave base station is transmitted, and the base station is switched for communication.

As described above, since switching is performed smoothly from the state where two base stations are simultaneously communicated, the time required for acquisition of synchronization, transmission power control, time alignment, and the like can be shortened. The time required for switching is shortened, and even when the mobile station is located far from the base station, such as near the boundary between two cells, simultaneous communication with the two base stations can be performed simultaneously. Can be obtained.

[0053]

The radio mobile station apparatus according to the present invention is configured as described above, and is particularly means for simultaneously transmitting a transmission signal from the main base station and a transmission signal from another base station (subordinate base station). And means for exchanging the functions of the main base station and the subordinate base station of the two base stations in communication according to the state of the received signal, and performing the communication by switching the base stations from the state in which the two base stations communicate simultaneously. Since it is performed continuously, the time required for acquisition of synchronization, control of transmission power, and time alignment can be reduced, so that the time required for base station switching is reduced, and the mobile station is located near the boundary between two cells. Even at a position far from the base station, simultaneous communication with two base stations can be performed, so that an excellent effect of improving transmission characteristics can be obtained.

[Brief description of the drawings]

FIG. 1 shows CDMA / TD according to an embodiment of the present invention.
FIG. 2 is a block diagram illustrating a configuration of a D-type wireless mobile station device.

FIG. 2 is a diagram showing a base station switching operation performed when the wireless mobile station apparatus shown in FIG. 1 moves.

FIG. 3 is a block diagram showing a configuration of a conventional CDMA / TDD wireless mobile station apparatus;

[Explanation of symbols]

 Reference Signs List 1,20 antenna 2,21 switch 3,22 RF receiving unit 4,23 AD converter 5,24 correlator 6 correlator 7,25 decoder 8,26 synchronization circuit 9,27 timing generation circuit 10 spreading code selection circuit Reference Signs List 11 Synchronization circuit 12, 28 Decoded data 13 Received power detection circuit 14, 29 Transmission data 15, 30 Encoder 16, 31, Spread multiplexing circuit 17, 32 DA converter 18, 33 RF transmission unit 19, 35 Control circuit 34 Transmission power Control circuit

Continuation of front page (72) Inventor Osamu Kato 4-3-1 Tsunashima Higashi, Kohoku-ku, Yokohama-shi, Kanagawa F-term in Matsushita Communication Industrial Co., Ltd. (Reference) 5K022 EE01 EE21 EE36 5K027 AA11 EE00 5K067 AA14 BB04 CC10 DD11 EE02 EE10 EE24 EE59 EE72 JJ35 JJ39 JJ52 JJ54

Claims (5)

[Claims] 1. A time alignment information generating means for generating time alignment information using a signal transmitted from a communicating main base station and a signal transmitted from a slave base station with which communication is performed next, and Transmitting means for transmitting to the slave base station, and handover control means for performing handover from the master base station to the slave base station after time alignment is performed at the slave base station, Wireless mobile station device. 2. When the received power of data from the slave base station becomes larger than the received power of data from the communicating main base station, switching the master base station to the slave base station and exchanging data. The wireless mobile station device according to claim 1, wherein: 3. A receiving means for receiving time alignment information used at the time of handover, which is transmitted from a mobile station with which a main base station is communicating, and said mobile station moves in a time-aligned state based on said time alignment information. A radio base station apparatus comprising: a transmitting unit that transmits data to a station. 4. A mobile station for generating time alignment information using a signal transmitted from a communicating main base station and a signal transmitted from a slave base station with which the mobile station next communicates; Transmitting from the mobile station to the slave base station, and performing a handover from the master base station to the slave base station after time alignment is performed at the slave base station. Handover method. 5. The handover method according to claim 4, wherein the slave base station transmits to the mobile station in a time-aligned state based on the time alignment information.