JPH11331123A - Equipment and system for cdma communication - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accelerate transmission speed without causing deterioration in the transmission quality. SOLUTION: An idle code monitoring means 240a is provided for monitoring the use condition of a spread code usable for communication between a relevant base station and a mobile station, and the monitored result is recorded in a storage part 241. Plural channel allocation control means 240b permits the use of two channels for the mobile station and performs control for allocating two spread codes to be used for them, corresponding to conditions such as the presence/absence of a request to use two channels from the mobile station, the number of non-used PN codes, and the lapse of preset time. Plural channel communication control means 240c control respective parts so as to perform communication with the mobile station, for which the communication of plural channels is permitted by the plural channel allocating means 240b, by opening two communication links.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CDMA communication apparatus and a CDMA communication system such as a portable telephone employing a CDMA (Code Division Multiple Access) system as a communication system.

[0002]

2. Description of the Related Art As is well known, in recent years, the CDMA system has been developed in order to cope with an increase in traffic due to an increase in the number of subscribers of mobile communication services such as a cellular phone and a need for higher speed and higher quality communication. 2. Description of the Related Art Mobile communication systems are being actively developed.

[0003] This CDMA system is one of digital communication systems using spread spectrum technology, and a plurality of users can share the same frequency band.
(TimeDivision Multiple Access) method or FDMA (F
The number of user channels per bandwidth can be increased as compared to the frequency division multiple access (requency division multiple access) method.

Further, since the transmission frequency band is wide, it is resistant to frequency-selective fading due to multipath signals.
Since the signal cannot be demodulated unless the same PN code is used as in the transmission, it has features such as excellent confidentiality.

[0005] However, even with this CDMA system, it is expected that higher speed and higher quality communication will be required in the future as data communication through mobile communication terminals such as mobile phones becomes popular. .

[0006]

In the communication system based on the CDMA system, it is expected that higher speed and higher quality communication will be required in the near future, and a new technology for achieving higher speed and higher quality will be developed. There was a request.

SUMMARY OF THE INVENTION The present invention has been made to meet the above-mentioned demands, and a CDMA communication apparatus and a CDM capable of increasing a transmission speed without deteriorating transmission quality.
A It is an object to provide a communication system.

[0008]

In order to achieve the above object, a CDMA communication apparatus according to the present invention comprises:
In a CDMA communication apparatus for performing wireless communication by a DMA method, a code allocating means for allocating a plurality of spreading codes to a communication partner station according to a traffic amount, and a plurality of spreading codes allocated by the code allocating means. A plurality of link establishing means for establishing a plurality of communication links with a partner station are provided.

In the CDMA communication apparatus having the above configuration, a plurality of spreading codes are assigned to a communication partner station according to the traffic amount, and a plurality of communication links are established between the communication partner station and the communication partner station using the assigned spreading codes. I am trying to open it.

Therefore, according to the CDMA communication apparatus having the above configuration, communication is performed through a plurality of communication links according to the amount of traffic, so that the transmission quality does not deteriorate.
The transmission speed can be increased.

Further, the present invention is characterized by comprising a data decomposing means for decomposing data to be transmitted to a communication partner station into a plurality of data to generate a plurality of data to be transmitted through the plurality of communication links. I do.

Therefore, according to the present invention, it is possible to transmit a predetermined amount of data at a speed that is approximately several times the number of the plurality of communication links to be opened, as compared with the case of transmitting the data through a single communication link.

Still further, according to the present invention, the data assembling means for assembling the plurality of data into the original state when the plurality of data received through the plurality of communication links is data decomposed by the communication partner station is provided. It is characterized by having.

Therefore, according to the present invention, it is possible to receive a predetermined amount of data at a speed almost equal to the number of the plurality of communication links to be opened, as compared with the case of receiving the data through one communication link.

In order to achieve the above object, a CDMA communication apparatus according to the present invention uses a plurality of spreading codes assigned by a communication partner station in accordance with a traffic amount in a CDMA communication apparatus for performing wireless communication according to a CDMA system. A plurality of link establishment means for establishing a plurality of communication links with the communication partner station.

Therefore, according to the CDMA communication apparatus having the above configuration, communication is performed through a plurality of communication links in accordance with the amount of traffic, so that transmission quality does not deteriorate.
The transmission speed can be increased.

In order to achieve the above object, a CDMA communication system according to the present invention is a mobile station that performs wireless communication by a CDMA method between a base station connectable to a communication station on a public network and this base station. In a CDMA communication system comprising a base station and a mobile station, the base station includes code allocation means for allocating a plurality of spreading codes to the mobile station in accordance with a traffic volume of communication via the base station. Is provided with a plurality of link establishment means for establishing a plurality of communication links between the two by using a plurality of spread codes assigned by the code assignment means.

In the CDMA communication system having the above configuration, the base station allocates a plurality of spreading codes to the mobile station according to the traffic volume of the communication via the own station, and uses the plurality of allocated spreading codes to communicate with the base station. The mobile station opens a plurality of communication links between the two.

Therefore, according to the CDMA communication system having the above configuration, communication is performed between the base station and the mobile station via the plurality of communication links established according to the amount of traffic, so that the transmission quality does not deteriorate. Thus, the transmission speed can be increased.

Further, according to the present invention, the base station is provided with data decomposing means for decomposing data transmitted from a communication station on the public network into a plurality of data to generate a plurality of data to be transmitted through a plurality of communication links. The mobile station comprises data assembling means for assembling a plurality of data received at a plurality of communication links and decomposed by the base station into an original state.

Therefore, according to the present invention, the number of communication links to be established is almost equal to that of transmitting a predetermined amount of data from a communication station on a public network to a mobile station through one communication link. It can be transmitted at twice the speed.

Still further, according to the present invention, the mobile station includes data decomposing means for decomposing data to be transmitted to the communication station into a plurality of pieces of data to generate a plurality of pieces of data to be transmitted through a plurality of communication links. The base station includes data assembling means for assembling a plurality of pieces of data received on a plurality of communication links and decomposed by the mobile station into an original state.

Therefore, according to the present invention, the number of a plurality of communication links to be established is substantially smaller than when a predetermined amount of data transmitted from a mobile station to a communication station on a public network is transmitted through one communication link. It can be transmitted at twice the speed.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A CDMA according to the present invention will be described below.
One embodiment of a communication system will be described. First, a mobile station (slave station) of the CDMA communication system will be described with reference to FIG. FIG. 1 shows the configuration of the mobile station.

First, a receiving system will be described. A radio frequency signal (hereinafter, referred to as a reception radio frequency signal) transmitted from a base station, which will be described later, is received by an antenna 101 and then transmitted via an antenna duplexer (DUP) 102. The signal is input to the receiving circuit (RX) 103.

In the receiving circuit 103, the reception radio frequency signal is mixed with the reception local oscillation signal output from the frequency synthesizer 104 and frequency-converted into an intermediate frequency signal. Note that the frequency of the reception local oscillation signal generated from the frequency synthesizer 104 is specified by a control signal SYC output from the control unit 140.

The intermediate frequency signal is divided into two, and the CDM
A signal processing units 1061 and 1062 are input. CDM
The operation of the A signal processing units 1061 and 1062 is controlled by the control unit 140. After performing an orthogonal demodulation process on the intermediate frequency signal, the A signal processing units 1061 and 1062 perform a despreading process using a PN code to obtain the reception data addressed to the own station. To play.

During normal communication using one PN code, the control unit 140 controls the CDMA signal processing unit 106.
2 is controlled to stop, and only the CDMA signal processing unit 1061 operates. On the other hand, at the time of communication using two PN codes,
Both the CDMA signal processing units 1061 and 1062 operate using the PN code notified to each by the control unit 140.

The received data reproduced by the CDMA signal processing units 1061 and 1062 are input to the corresponding control information branching / synthesizing units 1071 and 1072, and are respectively branched into control information and user information.

The control information is input to the control unit 140, and the user information is input to the user information decomposing / assembling unit 108. The control information includes data indicating whether communication is performed using two types of PN codes, in addition to identification data of a transmission source and data for identifying a destination.

The user information decomposing / assembling unit 108 inputs the user information input from the control information branching / synthesizing unit 1071 as it is to the switching unit 109 during normal communication according to the instruction of the control unit 140. At the time of communication using two PN codes, the control information branching / synthesizing sections 1071, 10
Two pieces of user information input from 72 are assembled into one piece of user information, and input to the switching unit 109.

The switching section 109 is controlled by the control section 140, and connects the user information decomposing / assembling section 108 and the voice code processing section 110 during voice communication, and inputs the user information to the voice code processing section 110. .

On the other hand, for data communication, the switching unit 109
The user information decomposing / assembling unit 108 is connected to the connector 120, and the user information is input to a portable computer such as a PDA (Personal Digital Assistance) or a notebook personal computer via a connector 121 connected to the connector. Perform output.

The voice code processing section 110 performs a decompression process on the user information input from the user information decomposing / assembling section 108 through the switching section 109, and converts it into a digital reception signal.

This digital reception signal is input to PCM code processing section 111 and decoded into an analog reception signal. The analog reception signal is amplified by the amplifier 112 and then output from the speaker 113.

Next, the transmission system will be described. The speaker's transmission signal input from the microphone 114 is transmitted to the amplifier 1.
After being amplified at 15, the signal is input to the PCM code processing section 111, subjected to PCM coding processing, and coded into a digital transmission signal.

This digital transmission signal is subjected to compression processing in a voice code processing section 110 and input to a user information decomposing / assembling section 108 via a switching section 109. When the connector 120 is connected to the portable computer via the connector 121, data input from the computer is input to the user information disassembling / assembling unit 108 via the switching unit 109. .

The user information decomposing / assembling unit 108 switches the switching unit 10 according to an instruction from the control unit 140 during normal communication.
9 is directly input to the control information branching / synthesizing unit 1071. On the other hand, in the case of communication using two PN codes, the data is divided into two parts to separate the control information branching / combining unit 1071.
The signals are input to the combining units 1071 and 1072, respectively.

Control information branching / combining sections 1071 and 1072
Sets transmission data as user information, adds control information input from the control unit 140 to the user information, generates transmission data, and converts the data to a corresponding CD.
Input to MA signal processing units 1061 and 1062.

The control information input from the control unit 140 includes, in addition to the identification data of its own device and the identification data of the transmission destination, a communication type indicating whether or not communication is performed using two types of PN codes. There is data.

CDMA signal processing units 1061 and 1062
Performs spreading processing on the transmission data using each of the PN codes (assigned from the base station) specified by the control unit 140, performs quadrature modulation processing, and transmits the intermediate frequency signal for transmission. Generate

These intermediate frequency signals are transmitted to a transmission circuit (T
X) In 105, the signal is mixed with a transmission local oscillation signal generated from the frequency synthesizer 104 and frequency-converted into a transmission radio frequency signal. This transmission frequency signal is
The signal is input to the antenna 101 via the antenna duplexer 102, and transmitted from the antenna 101 to the base station.

The control unit 140 is, for example, a microcomputer as a main control unit.
The control unit establishes a communication link with the base station and performs control for performing voice and data communication, and includes a multi-channel request control unit 140a and a multi-channel communication control unit 140b as new control functions.

When a user instructs to perform communication using two channels through a console unit (CU) 142, which will be described later, the multi-channel request control means 140a transmits to the base station through the control information described above. In this case, control for requesting assignment of two channels is performed.

The multi-channel communication control means 140b performs communication using two PN codes allocated through the control information when the base station notifies the permission to use the two channels through the control information. Each part is controlled.

The storage unit 141 uses a semiconductor memory such as a ROM or a RAM as a storage medium. The storage medium stores a control program of the control unit 140 and ID data of its own device necessary for authentication with a base station. In addition to various control data related to the communication, dial data corresponding to abbreviated dialing and setting data of various functions are stored.

The console unit 142 includes a key group such as a dial key, a transmission key, an end key, a volume control key, and a mode designation key, and an LCD display for displaying the telephone number of the communication partner terminal and the state of the terminal itself. Of the battery 131
It is composed of an LED lamp indicating a discharge state (requesting charging of the battery 131). Reference numeral 130 denotes a power supply circuit. In the power supply circuit 130, a predetermined operation power supply voltage Vcc is generated based on an output of the battery 131 and supplied to each unit.

Next, a base station (master station) of the CDMA communication system will be described with reference to FIG. FIG. 2 shows the configuration of the base station. First, the reception system will be described. A radio frequency signal transmitted from the above-described mobile station (hereinafter, referred to as a reception radio frequency signal) is transmitted through an antenna 20.
After being received at 1, the signal is input to a receiving circuit (RX) 203 via a duplexer (DUP) 202.

In the reception circuit 203, the reception radio frequency signal is mixed with the reception local oscillation signal output from the frequency synthesizer 204 and frequency-converted to an intermediate frequency signal. Note that the frequency of the reception local oscillation signal generated by the frequency synthesizer 204 is specified by a control signal SYC output from the control unit 240. The intermediate frequency signal is divided into n signals and input to the corresponding CDMA signal processing units 2061, 2062,.

CDMA signal processing units 2061, 2062...
206n is controlled by the control unit 240, performs quadrature demodulation processing on the intermediate frequency signal, performs despreading processing using a PN code, and reproduces received data addressed to the own station.

CDMA signal processing units 2061, 2062...
The received data reproduced by 206n is input to the corresponding control information branching / synthesizing units 2071, 2072,... 207n, and is respectively branched into control information and user information.

The control information is input to the control unit 240, and the user information is input to the user information disassembly / assembly unit 208. The control information includes two types of PNs in addition to the identification data of the transmission source and the data for identifying the destination.
It includes data indicating whether or not the communication is performed using a code.

The user information decomposing / assembling unit 208 transmits the user information to the communication partner on the network through the network connection unit 209 as it is under the control of the control unit 240 for the user information of the normal communication. On the other hand, for user information decomposed using two PN codes, the control information branch /
Of the user information input from the combining units 2071, 2072,.
Are assembled into two pieces of user information and transmitted to the communication partner through the network connection unit 209.

Next, the transmission system will be described. User information input from a communication partner on the network is input to the user information decomposing / assembling unit 208 via the network connection unit 209.
The user information decomposing / assembling unit 208 performs a normal communication,
The user information is directly input to any of the control information branching / combining units 2071, 2072,.

On the other hand, in the case of communication using two PN codes, the user information decomposing / assembling unit 208 decomposes the user information into two, and the control information branching / combining unit 2071 assigned by the control unit 240. , 2072... 207n.

Control information branching / combining units 2071 and 2072
207n generate transmission data by adding the control information input from the control unit 240 to the input user information, and transmit the generated data to the corresponding CDMA signal processing unit 2.
06n, 2062 ... 206n.

The control information input from the control unit 240 includes communication data using two types of PN codes in addition to the identification data of the own station, the identification data of the transmission source on the network, and the identification data of the transmission destination. And communication type data indicating whether or not this is the case.

CDMA signal processing units 2061, 2062...
206n performs a spreading process on the transmission data using each of the PN codes specified by the control unit 240, and then performs a quadrature modulation process to generate an intermediate frequency signal for transmission.

These intermediate frequency signals are transmitted to a transmission circuit (T
X) At 205, the signal is mixed with the transmission local oscillation signal generated from the frequency synthesizer 204 and frequency-converted into a transmission radio frequency signal. This transmission frequency signal is
The signal is input to the antenna 201 via the antenna duplexer 202 and transmitted from the antenna 201 to each mobile station.

The control unit 240 has a microcomputer as a main control unit, for example.
It performs control for establishing a communication link with each mobile station to perform voice and data communication, and control for establishing a communication link with a communication partner on the network. , A plurality of channel allocating means 240
b, a multi-channel communication control means 240c.

The free code monitoring means 240a monitors the use status of the spreading code which can be used by the base station for communication with the mobile station.
Record in 1.

The multiple-channel allocation control means 240b responds to conditions such as the presence or absence of a request from a mobile station to use two channels, the number of unused PN codes, and whether or not a preset time has elapsed. , Permitting a mobile station to use two channels and assigning two spreading codes to be used for the two channels.

The multi-channel communication control means 240c controls each unit so as to perform communication by establishing two communication links with the mobile station to which the multi-channel communication is permitted by the multi-channel allocation means 240b. is there.

The storage unit 241 uses a semiconductor memory such as a ROM or a RAM as a storage medium. The storage medium stores a control program of the control unit 240 and ID data of its own station necessary for authentication with a mobile station. In addition to the various control data related to the communication, the monitoring result of the empty code monitoring means 240a is stored.

Next, with reference to FIG.
The operation of the communication system A will be described. FIG. 3 is a flowchart showing a control flow of the control unit 240 of the base station.

First, the mobile station is waiting for a call request from the mobile station (step 3a). If there is a call request from the mobile station, the process proceeds to step 3b. If not, the process proceeds to step 3c. I do.

In step 3b, the multiple channel assignment control means 240b determines whether or not the control information extracted from the received signal of the mobile station includes data indicating a request for performing communication using two channels. . Here, if the mobile station is requesting multi-channel communication, the process proceeds to step 3d, and if not, step 3h.
Move to

On the other hand, when the process proceeds to step 3c,
The multiple channel allocation control means 240b monitors whether or not a preset time has elapsed. If the time has elapsed, the process proceeds to step 3d. If not, the process returns to step 3d. Return to step 3a. At step 3d, the unused code monitoring means 240a
The number of N codes is counted, and the process proceeds to step 3e.

In step 3e, the multi-channel allocation control means 240b determines, based on the counting result in step 3d,
It is determined whether or not the traffic volume of the communication through the own station has a margin. As a criterion for this determination, for example, the determination is made based on whether or not the count result exceeds a predetermined number. Here, if there is enough traffic, the process proceeds to step 3f,
On the other hand, if there is no room, the process proceeds to step 3h.

In step 3f, the multiple channel allocation control means 240b refers to the control information from the mobile station to which multiple channels are to be allocated, and determines whether or not this mobile station supports multiple channel communication. here,
If it supports multi-channel communication, step 3
g, and if not, the process proceeds to step 3h.

In step 3g, the multiple channel allocation control means 240b allocates two vacant PN codes to the mobile station to which the multiple channels are allocated through the control information. Then, the multi-channel communication control means 240c starts communication through the two channels with the mobile station, and proceeds to step 3i.

In step 3h, the control unit 240 assigns one PN code to the mobile station in the same manner as normal communication, whereby normal communication starts with the mobile station.
Move to step 3i.

In step 3i, the control unit 240 monitors the communication state of the mobile station through its own station. If the communication is continued, the control unit 240 proceeds to step 3a. And disconnect the line.

As described above, in the CDMA communication system having the above configuration, when the base station has a margin in the traffic volume of the communication through the own station when a call request is issued from the mobile station or when a predetermined time has elapsed. Two PN codes are assigned to the mobile station to establish two communication links with the mobile station.

In this communication link, the transmitting side divides the data into two, and transmits each data in correspondence with one communication link, and the receiving side transmits two data received through the two communication links. Into one piece of data for communication.

Therefore, according to the CDMA communication system having the above configuration, the transmission speed can be doubled for both data communication and voice communication, and the speed can be increased in accordance with the traffic volume. In addition, the speed can be increased without deteriorating the transmission quality.

The present invention is not limited to the above embodiment. For example, in the above embodiment, two communication links are established between the base station and the mobile station. However, if the configuration is redundant so as to establish three or more communication links, three or more times may be used. The transmission speed can be increased.

In the above embodiment, the control unit 240 of the base station monitors the usage status of the PN code and determines whether to allocate a plurality of channels to the mobile station according to the usage status. Instead of this, for example, the base station may monitor the amount of interference and perform the assignment according to the monitoring result.

Further, the data communication can be applied to intermittent data communication such as packet communication, and it goes without saying that the same effect can be obtained in this case. It goes without saying that various modifications can be made without departing from the spirit of the present invention.

[0080]

As described above, according to the present invention, a plurality of spreading codes are allocated (or allocated) to a communication partner station in accordance with the amount of traffic, and the allocated (allocated) plurality of spreading codes are used. Thus, a plurality of communication links are established with a communication partner station.

Therefore, according to the present invention, since communication is performed via a plurality of communication links according to the amount of traffic, a CDMA communication apparatus capable of increasing the transmission speed without deteriorating the transmission quality is provided. Can be provided.

Further, according to the present invention, the base station allocates a plurality of spreading codes to the mobile station in accordance with the traffic volume of the communication through the base station, and uses the allocated plurality of spreading codes.
The base station and the mobile station open a plurality of communication links between them.

Therefore, according to the present invention, since communication is performed between a base station and a mobile station via a plurality of communication links established according to the amount of traffic, transmission quality is not deteriorated and transmission speed is reduced. CD that can achieve high speed
An MA communication system can be provided.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram showing a configuration of a mobile station in a CDMA communication system according to an embodiment of the present invention.

FIG. 2 is a circuit block diagram showing a configuration of a base station of the CDMA communication system according to one embodiment of the present invention.

FIG. 3 is a flowchart illustrating a control operation of the base station illustrated in FIG. 2;

[Explanation of symbols]

101, 201 ... antenna 102, 202 ... antenna duplexer (DUP) 103, 203 ... receiving circuit (RX) 104, 204 ... frequency synthesizer 105, 205 ... transmitting circuit (TX) 1061, 1062, 2061 to 206n ... CDMA signal processing Units 1071, 1072, 2071 to 207n Control information branching / synthesizing unit 108, 208 User information decomposing / assembling unit 109 Switching unit 110 Voice code processing unit 111 PCM code processing unit 112, 115 Amplifier 113 Speaker 114 ... microphones 120, 121 ... connector 130 ... power supply circuit 131 ... batteries 140, 240 ... control unit 140a ... multiple channel request control means 140b ... multiple channel communication control means 141, 241 ... storage unit 142 ... console unit (CU) 209 ... network Connection Unit 240a: Unused code monitoring means 240b: Plural channel allocation control means 240c: Plural channel communication control means

Claims (15)

[Claims] 1. A CDMA (Code Division Multiple Acc)
ess) a CDMA communication apparatus that performs wireless communication by using a code allocating means for allocating a plurality of spreading codes to a communication partner station in accordance with a traffic amount, and a plurality of spreading codes allocated by the code allocating means. A CDMA communication apparatus comprising: a plurality of link establishment means for establishing a plurality of communication links with a communication partner station. 2. The apparatus according to claim 1, wherein the code allocating unit detects the traffic amount from an interference amount, and allocates a plurality of spreading codes to the communication partner station according to the traffic amount. CDMA communication device. 3. The code allocating means detects the amount of traffic from the number of spread codes used in another communication, and allocates a plurality of spread codes to the communication partner station according to the amount of traffic. The CDM according to claim 1, wherein
A communication device. 4. The code allocating means allocates a plurality of spreading codes to the communication partner station according to the traffic amount when the communication partner requests allocation of a plurality of spreading codes. Claims 1 to 3
2. The CDMA communication device according to 1. 5. A CDMA (Code Division Multiple Acc)
ess) In a CDMA communication apparatus for performing wireless communication by a method, a plurality of link establishing means for establishing a plurality of communication links with the communication partner station by using a plurality of spreading codes assigned by the communication partner station according to a traffic amount. A CDMA communication device comprising: 6. A data decomposing means for decomposing data to be transmitted to the communication partner station into a plurality of pieces to generate a plurality of pieces of data to be transmitted through the plurality of communication links, respectively. The CDMA communication device according to any one of claims 1 to 5. 7. A data assembling means for assembling the plurality of data into an original state when the plurality of data received through the plurality of communication links is data decomposed by the communication partner station. The CDMA communication device according to any one of claims 1 to 5, wherein 8. The communication performed through the plurality of communication links is packet communication.
The CDMA communication device according to claim 7. 9. A base station connectable to a communication station on a public network and a CDMA (Code Division Multi) between the base station and the base station.
In a CDMA communication system comprising a mobile station performing wireless communication according to the iple Access method, the base station allocates a plurality of spreading codes to the mobile station according to the traffic volume of communication via the base station. Wherein the base station and the mobile station each comprise a plurality of link establishing means for establishing a plurality of communication links between the two, using a plurality of spreading codes assigned by the code assigning means. CDMA communication system. 10. The code allocating means detects the amount of traffic from an amount of interference of communication via the own station, and allocates a plurality of spreading codes to the mobile station according to the amount of traffic. The CDMA communication system according to claim 9. 11. The code allocating means detects the amount of traffic from the number of spread codes allocated to communication via the own station, and allocates a plurality of spread codes to the mobile station according to the amount of traffic. The CDMA communication system according to claim 9, wherein: 12. The mobile station according to claim 12, wherein said code allocating means allocates a plurality of spread codes to said mobile station according to said traffic amount when said mobile station requests allocation of a plurality of spread codes. The CDMA communication system according to claim 9. 13. The base station includes data decomposing means for decomposing data sent from the communication station into a plurality of pieces to generate a plurality of pieces of data to be transmitted through the plurality of communication links, respectively. 13. A data assembling unit according to claim 9, further comprising a data assembling unit for assembling a plurality of data received through the plurality of communication links and decomposed on the base station side into an original state. CDMA described
Communications system. 14. The mobile station, further comprising: data decomposing means for decomposing data to be transmitted to the communication station into a plurality of pieces to generate a plurality of pieces of data to be transmitted through the plurality of communication links, respectively. 13. The mobile station according to claim 9, further comprising: data assembling means for assembling a plurality of data received at the mobile station side, which are received through the plurality of communication links, into an original state. CDMA
Communications system. 15. The CDMA communication system according to claim 9, wherein communication performed through said plurality of communication links is packet communication.