JPH10308979A - Radio communication system and radio communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the information transmission efficiency in multimedia communication and to save a channel resource and a code resource. SOLUTION: At least a base station (BTS) 100 in a CDMA radio communication system has a TYP field in an information frame before coding, a bit string as a channel identifier is given to the TYP field and a channel processing section 105b is provided, which selects processing of an information frame corresponding to the channel identifier or medium identifier of the information frame to attain channel/medium control in the unit of information frames. And even in the case that the number of function channels used actually for radio communication is larger than the number of codes processed in the system, the function channel is identified and the code resource is saved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a code division multiple access (CDMA) wireless communication system.

[0002]

2. Description of the Related Art Code division multiple access (C) is one method of a mobile communication system capable of increasing user capacity and improving communication quality.
ode Division Multiple Access (hereinafter abbreviated as CDMA). In the CDMA system, a specific code is assigned to each line, and a modulated wave of the same carrier frequency is spread by this code and transmitted. On the receiving side, each code is synchronized and a desired line is identified. Is a multiple access method, and SSMA (Spread
Spectrum Multiple Access) method. This C
The DMA system does not require an initial connection process unlike the TDMA system and the like, as long as the codes are determined each other,
It has the advantage of being able to communicate directly for each call, and is also excellent in confidentiality and interference resistance.

As a wireless communication system that provides a communication service to a user by adopting the CDMA system, for example,
DMA cellular systems and the like.

In this CDMA cellular system, a plurality of base stations whose service area is a predetermined distance range in which wireless communication is possible are distributed and arranged such that the service area partially overlaps the service area of an adjacent base station. Then, when the base station provides a communication service by radio communication to a mobile terminal existing in the service area, and the mobile terminal moves to an adjacent service area, the communication service is transmitted to the destination base station by baton touch ( By performing a control operation such as handoff, the communication service for the mobile terminal is continued. In this system, the service area of each base station is called a cell, and since the location registration of mobile terminals and the execution and management of communication services are performed in cell units, such a system is called a cellular system. In addition, each base station can communicate within a cell by performing wireless communication with a mobile terminal in a CDMA system. CD
The MA-based wireless communication refers to code division multiple access of a plurality of channels in each cell using the same carrier frequency. Also, the base station of the destination cell uses the same carrier frequency as that used by the mobile terminal so that wireless communication can be continued even when the communicating mobile terminal moves to an adjacent cell. To communicate.

Thus, code division multiple access (CDMA)
The cellular system adopts the system, which spreads the energy of the original information bits in a wide band on the frequency axis and performs communication, so it is more resistant to interference than other systems, and realizes path diversity and easy handoff. There is a feature that it is excellent.

[0006] Information communicated in this CDMA cellular system, that is, information frames such as function channels, are encoded with a certain assigned code, encapsulated in a part of a radio frame, and transmitted / received. In this case, one medium (channel) is transmitted and received in one radio frame.

The conventional CDMA cellular system has a transmission capacity of, for example, about 10 msec / frame.
In one radio frame, many, for example, # 0 to # 1
There are about 16 slots up to 5, and each slot has
A band of about 0.625 msec / frame is allocated.

However, usually, not all bands are used in one radio frame. In particular, in the case of voice communication or the like, each band has a lot of free space due to a small amount of information.

On the other hand, at present, researches for communicating various media data such as image data and character data other than voice data in one radio frame have been actively conducted. In general, in this type of system, one base station is used. Since the number of codes for encoding / decoding information frames such as functional channels into radio frames at a station is limited, if all functional channels are to be identified at a code level, the number of codes for control channels is increased accordingly. Is reduced, which also leads to loss.

[0010]

As described above, in the conventional wireless communication system, there is a problem that a band of one wireless frame to be communicated often has a vacant space and information transmission efficiency is poor.

Further, in order to communicate information of various media, it is expected that a code for a function channel will be insufficient, and it is necessary to save channel resources and code resources. Accordingly, the present invention has been made to solve such a problem, and a radio communication system and a radio communication system capable of improving information transmission efficiency in one radio frame and saving channel resources and code resources. It is intended to provide a way.

[0012]

In order to achieve the above object, in a wireless communication system according to the present invention, at least one distributed base station and a mobile terminal use a plurality of slots of a wireless frame. Code division multiple access (C
In a wireless communication system that performs information communication according to a DMA (DMA) method, means for dividing different first information and second information so that each of the first information and the second information falls within at least the communication band of each slot, Means for assigning a unique identifier to each of the information and the second information, and multiplexing means for multiplexing the first information and the second information to each of which the unique identifier is assigned to the radio frame in slot units. ,
Wireless transmission means for wirelessly transmitting the wireless frame multiplexed in slot units by the multiplexing means.

According to a second aspect of the present invention, there is provided a wireless communication method wherein at least one base station and a mobile terminal which are distributed and arranged use a plurality of slots of a wireless frame to perform code division multiple access (C).
In a wireless communication method for performing information communication by a DMA (DMA) method, a step of dividing different first information and a second information such that each of the first information and the second information is at least included in a communication band of each of the slots; Assigning a unique identifier to each of the information and the second information, and multiplexing the first information and the second information to each of which the unique identifier is assigned to the radio frame in slot units; Wirelessly transmitting the wireless frame in which information is multiplexed in the slot unit.

According to a third aspect of the present invention, there is provided a wireless communication system in which at least one base station and a mobile terminal, which are distributed and arranged, set a control channel and a communication channel in a plurality of slots of a wireless frame, and use the respective channels. Receiving means for receiving the radio frame, and information on a control channel and a communication channel from each slot of the radio frame received by the receiving means. Means for extracting the information of the control channel and the communication channel extracted from each other with the same identifier assigned thereto, and means for assembling the collected information into the original unit. I do.

According to a fourth aspect of the present invention, at least one base station and a mobile terminal, which are distributed and arranged, set a control channel and a communication channel in a plurality of slots of a radio frame, and use the respective channels. Receiving a wireless frame in a wireless communication method for performing information communication by a code division multiple access (CDMA) method;
Extracting control channel and communication channel information from each slot of the received radio frame, and extracting the extracted control channel and communication channel information,
It comprises a step of collecting the same identifiers assigned to each, and a step of assembling the collected information into the original unit.

According to a fifth aspect of the present invention, there is provided a radio communication system in which at least one base station and a mobile terminal, which are distributed and arranged, perform information communication by a code division multiple access (CDMA) method using each slot of a radio frame. In a communication system, an identifier assigning means for assigning a unique identifier to each of a predetermined unit of first information and a second information different from the first information, and a unique identifier is assigned by the identifier assigning means. Encoding means for encoding the first and second information obtained, and dividing the first and second information encoded by the encoding means into slots according to the respective information amounts. Wireless transmitting means for wirelessly transmitting the wireless frame; receiving means for receiving the wireless frame transmitted by the wireless transmitting means; and receiving means for receiving the wireless frame. Means for decoding the encoded information of the radio frame in the unit and compiling the first information and the second information for each identifier, and for the first information and the second information respectively compiled, Means for performing processing according to the identifier.

According to a sixth aspect of the present invention, in the wireless communication method, at least one distributed base station and a mobile terminal use a plurality of slots of a radio frame to perform code division multiple access (C).
In a wireless communication method for performing information communication according to a DMA (DMA) method, a step of assigning a unique identifier to each of a predetermined unit of first information and a second information different from the first information; First and second
Encoding each of the information, dividing the encoded first and second information in accordance with the respective information amounts, inserting the divided information into slots, and wirelessly transmitting the information in units of the wireless frame; Receiving the received radio frame, decoding the encoded information of each slot of the received radio frame, and combining the information into first information and second information for each identifier. First information and second
Performing a process in accordance with the identifier for the information.

According to a seventh aspect of the present invention, there is provided a wireless communication system in which at least one base station and a mobile terminal, which are distributed and arranged, perform information communication by a code division multiple access (CDMA) method using a plurality of slots of a wireless frame. In a communication system, encoding means for encoding first information of a predetermined unit and second information different from the first information to generate first encoded information and second encoded information, respectively. An identifier assigning unit that assigns a unique identifier to each of the generated first encoded information and the second encoded information; and an encoded second identifier assigned with the unique identifier by the identifier assigning unit. Wireless transmitting means for distributing the first and second information to the respective slots and wirelessly transmitting the information in units of the wireless frame, and receiving the wireless frame transmitted by the wireless transmitting means Communication means, and means for summarizing the encoded information of each slot of the radio frame received by the receiving means into first encoded information and second encoded information each having the same identifier, A decoding unit is provided for decoding the combined first encoded information and second encoded information.

In the wireless communication method according to the present invention, at least one distributed base station and a mobile terminal use a plurality of slots of a radio frame to perform code division multiple access (C).
In a wireless communication method for performing information communication according to a DMA (DMA) method, first information of a predetermined unit and second information different from the first information are respectively encoded to form first encoded information and second code. Generating the conversion information, and the generated first
Assigning a unique identifier to each of the encoded information and the second encoded information, and dividing the first and second encoded information associated with the unique identifiers according to the respective information amounts Wirelessly transmitting in a slot together with an identifier in the unit of the wireless frame, receiving the transmitted wireless frame, and having the same encoding information of each slot of the received wireless frame. The method includes a step of combining the first encoded information and the second encoded information which are different from each other, and a step of decoding the combined first encoded information and the second encoded information.

According to a ninth aspect of the present invention, in the wireless communication method, at least one base station and a mobile terminal, which are distributed and arranged, set a control channel and a communication channel in a plurality of slots of a radio frame, and use each channel. In the wireless communication method for communicating information frames by a code division multiple access (CDMA) method, when the base station and the mobile terminal transmit the wireless frame, information frames of different channel types / media types are transmitted for each of the slots. Dividing, and adding a unique channel identifier or a media identifier set for each type to the divided information and multiplexing and transmitting the information to the radio frame,
A step of collecting, when receiving the transmitted radio frame, information in which the channel identifier or the media identifier of each slot constituting the radio frame matches, and assembling the collected information into an information frame. Have.

According to a tenth aspect of the present invention, at least one distributed base station and a mobile terminal set a control channel and a communication channel in a plurality of slots of a radio frame, and use the respective channels. In a wireless communication system for communicating information frames by code division multiple access (CDMA), at least one of the base station and the mobile terminal is assigned to an information frame to be transmitted or received according to its type. There is provided a channel processing means for executing different processing according to the type of the channel identifier or the media identifier.

In the conventional radio communication system, it is rare that all the information is carried in each slot, and the surplus band is lost, but the surplus band in the radio frame is replaced by another medium (channel). Can be transmitted, the information transmission efficiency is improved. In this case, identifying all the functional channels at the code level is not good for a system having a limited code resource because a channel code is required for that.

Therefore, according to the present invention, a channel identifier is provided in a part of an information frame instead of identifying a functional channel at a code level, and inserted into each slot of a radio frame for transmission. At the time of reception, the function channel is identified by the type of the identifier.

Thus, a plurality of different media can be communicated by one radio frame without giving a code to each channel, and the transmission efficiency can be improved.

By assigning a channel identifier and a media identifier to the function channels, even if the number of control channel codes that can be handled by the present system is smaller than the number of all function channels actually used in wireless communication, all functions are provided. Channel identification becomes possible, and code resources for control channels can be saved, and accordingly, the number of codes for communication channels can be increased and the circuit size of the base station can be reduced.

According to the fifth and sixth aspects of the present invention, when transmitting an information frame, an identifier is added to the information frame before encoding, and then the encoded information frame is encoded and transmitted in each slot of the radio frame. When a radio frame is received, encoded information that has been allocated to each slot is decoded and information is collected for each identifier.

According to the seventh and eighth aspects of the present invention, when transmitting an information frame, the information frame is encoded, an identifier is added thereto, and the information frame is transmitted in each slot. When a radio frame is received, the information having the same identifier among the information allocated to the slots is collected to restore the original information.

According to the ninth aspect of the present invention, when transmitting a radio frame, information frames of different channel types / media types are divided for each of the slots, and a unique channel set for each type in the divided information. When an identifier or a media identifier is added and multiplexed on a radio frame and transmitted, and when the transmitted radio frame is received, information in which the channel identifier or the media identifier of each slot constituting the radio frame matches is collected and individually. Is assembled into an information frame, so that the mobile terminal can transmit information with different channels or media in each slot of one radio frame.

According to the tenth aspect of the present invention, the information of the communication channel is identified by the channel identifier / media identifier assigned to the information frame and different processing is executed. , And transmission can be performed, and transmission efficiency can be improved.

As a result, it is possible to improve information transmission efficiency when performing multimedia communication and to save channel resources and code resources.

[0031]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a diagram showing a configuration of a functional channel in a radio interface between a radio base station and a mobile terminal according to the present invention.

As shown in the figure, a functional channel is a control channel used for transmitting and receiving control information.
User packet channel (UPCH) used to communicate (CCH) with user-defined control information and packet data information (connectionless (CL type) data information)
And a communication channel (TCH) used to communicate real-time user information (connection-oriented (CO-type) data information) such as voice, etc., and are roughly classified into three types of channels. I have. User packet channel (UPCH) is a user-defined control channel (USCCH), which is a bidirectional channel used to transmit and receive user-defined control information, and a bidirectional channel used to transmit and receive connectionless packet data information. It is classified into two types: a certain user-defined packet channel (USPCH).

The control channel (CCH) is a broadcast channel (BCC
H), Common control channel (CCCH), Associated information channel (ACCH)
Has been classified.

Next, the classified channels will be described.

(1) Broadcast information channel (BCCH) The broadcast information channel (BCCH) is a one-way downlink channel for broadcasting control information from a base station to a mobile terminal. Forward.

(2) Common control channel (CCCH) Used in the link channel establishment phase, it transmits and receives control information necessary for connection.

(2-1) Paging Channel (PCH) A one-way downlink channel for simultaneously transferring the same information from a base station to a mobile terminal to a paging area extending over a single cell or a plurality of cells.

(2-2) Individual Cell Channel (SCCH) Used for transferring information necessary for call connection between the base station and the mobile terminal. (3) Associated control channel (ACCH) This is a bidirectional channel attached to the communication channel (TCH), and transmits control information required for call connection, control information required for handoff control, and user packet data.

(3-1) Low-speed associated control channel (SACCH) SCHCH has the same code as TCH / FACCH and performs low-speed data transmission. The SACCH channel can also be used as an ACK transmission channel. It can also be used as a control channel when adding more media during communication. Also, it can be used as a signaling channel for handoff and the like.

(3-2) High-speed associated channel (FACCH) A channel for performing high-speed data transmission by temporarily stealing.
The FACCH set on the link channel has a function of assigning a code required for setting a service channel.

FIG. 2 is a diagram showing the configuration of the first embodiment according to the CDMA radio communication system of the present invention.

As shown in the figure, this radio communication system is composed of a plurality of base stations (BTS) 100 and at least one mobile terminal 101 which are distributed and arranged so that their service areas overlap. . In this wireless communication system, a base station (BTS) 100 and a mobile terminal 10
Information communication is performed by a code division multiple access (CDMA) method using a radio frame having a plurality of slots between the communication apparatus 1 and the communication apparatus 1.

The base station (BTS) 100 includes a sector antenna 102, a transmission / reception amplification unit (AMP unit) 103, a radio unit (TRX unit) 104, a BB-CH unit 105, an ATM interface unit (ATM IF unit) 106, and a VPI / VC
I table 107, access control unit 108, time division multiplex bus 109, CPU bus 110, radio base station control unit (B
TS-CNT section) 111 and the like.

A plurality of BB-CH units 105 (for N codes)
Baseband processing section 105a and channel processing section 105
b and a correspondence table 105c. The baseband processing unit 105a performs processing of a baseband signal. The correspondence table 105c includes the time division multiplex bus 1
The time division multiplex slot number 09 (# 1 to #N) and the type of the information frame are defined correspondingly. The channel processing unit 105b refers to the correspondence table 105c, identifies the time division multiplex slot number according to the type of the information frame,
The data is output to a time-division multiplex slot (bus) of the corresponding number of the time-division multiplex bus 109. If the type of the information frame is, for example, TCH or USPCH, it is a communication frame, and therefore the information frame is assigned a corresponding number (for example, 3
No.), and if the type of the information frame is, for example, SCCH or USCCH, the information frame is output to the corresponding number (eg, No. 4) time division multiplex slot. The ATM IF unit 106 is in charge of communication information retransmission control and ARQ. The ATM IF unit 106 monitors a time-division multiplex slot, for example, number 3, of the time-division multiplex bus 109, and if there is an information frame in the third time-division multiplex slot, acquires it. VP
The I / VCI table 107 holds the correspondence between time division multiplex slot numbers and VPI / VCI. The access control unit 108 monitors a time division multiplex slot, for example, the fourth time division multiplex bus 109, and if there is an information frame in this fourth time division multiplex slot, acquires it. The radio base station control unit (BTS-CNT unit) 111 is responsible for radio management (channel assignment), mobility management (handoff, location registration), call control, and the like.

FIG. 3 shows the base station 100 and the mobile terminal 101.
FIG. 3 is a diagram showing an example of a radio frame / slot configuration transmitted and received between the radio frames and slots.

As shown in FIG. 3A, the radio frame is composed of a total of 16 slots, ie, slot # 0 to slot # 15. The transmission rate per frame is
For example, assuming 10 msec, the transmission rate per slot is 0.625 msec, as shown in FIG. Each slot has a pilot signal field, a transmit power control signal (T
PC) field, a TYP field as a field for storing a TYP as a channel identifier or a media identifier, a Coded Data field, and a Pilot signal field.

In the TYP field, a bit string that indicates the type of the slot (1) channel identifier (2) media identification information (CBR / VBR / UBR / ABR) (3) traffic type (CO / CL) Inserted.

Next, the operation of the wireless communication system according to the first embodiment will be described.

In the wireless communication system according to the first embodiment, the base station (BTS) 100
The operation of receiving and transmitting information using the radio frame / slot having the configuration shown in FIG.

First, the receiving operation will be described.

When a radio frame transmitted from the mobile terminal 101 by the CDMA system is received by the sector antenna 102 of the base station (BTS) 100, signals of two systems (one carrier) per sector are transmitted to the TRX via the AMP unit 103. The signal is input to the section 104 and quasi-synchronous detection is performed in the TRX section 104. After that, the digital data A / D converted by the TRX section 104 is input to the BB-CH section 105.

Then, through the baseband processing unit 105a of the BB-CH unit 105, the digital data is transmitted in the form of the radio frame shown in FIG.
Is input to

The channel processing unit 105b decomposes the input radio frame into each slot as shown in FIG. 3B, deletes the Pilot / TPC, and as shown in FIG. Cod between slots with the same value of
The ed Data is collected and assembled to generate two packets, which are sets of Coded Data of different channel types / media types. In this case, packets of a plurality of channels / media are temporarily stored in a stack (not shown) in the channel processing unit 105. Then, these packets are deinterleaved and Viterbi-decoded by the channel processing unit 105b, and original information frames are respectively generated (restored).

Subsequently, in the channel processing unit 105b, control of the information frame / identification of the user information (functional channel) is performed.

Then, the channel processing unit 105b sets the transfer destination of the information frame to the ATM IF according to the identification result.
Unit 106, access control unit 108, BTS-CNT unit 1
Select from 11

The BB-CH unit 105 has N baseband processing units 105a, and can perform baseband processing for N codes. Since there are N codes, at least N time division multiplex slots (buses) can be defined in the time division multiplex bus 109, and the time division multiplex slot number (#
Since the correspondence between the information frame type and the information frame type is defined in the correspondence table 105c, the channel processing unit 105b refers to the correspondence table 105c to perform the time division corresponding to the information frame type. The multiplex slot number is acquired, and the information frame is output to the time division multiplex bus 109 at the timing of the time division multiplex slot of the obtained number.

On the other hand, the ATM IF unit 106, the access control unit 108, the BTS-CNT unit 111, and the like monitor the time division multiplex slots of the time division multiplex bus 109 assigned to them, and the BB-CH unit 105 The information frame output to the time division multiplex bus 109 is, for example,
If TCH or USPCH, time-division multiplexed bus 109
Since the information frame is transmitted to the third time-division multiplexing slot, the ATM IF unit 106 monitoring the third time-division multiplexing bus 109, for example, acquires the information frame.

Since the VPI / VCI table 107 holds the correspondence between the time division multiplex slot number and the VPI / VCI, the ATM IF unit 106
It accesses the CI table 107, recognizes the VPI / VCI corresponding to the time division multiplex slot number of the information frame input from the time division multiplex bus, and
I sends an information frame.

The ATM IF unit 106 sends TCH, US
The information frame of the PCH function channel is a time-division multiplexed bus 1
When the data is output to the time division multiplexing bus 09, the data is output to the time division multiplexing bus 109 at the timing of the predetermined corresponding time division multiplexing slot number.

On the other hand, the information frame output from the BB-CH unit 105 to the time division multiplex bus 109 is, for example, an SCCH.
Or, in the case of USCCH, the time division multiplex bus 109
For example, since the information frame is transmitted to the fourth time division multiplex slot, the access control unit 108 monitoring the fourth time division multiplex bus 109 acquires it. When the SCCH, USCCH, BCCH, and PCH function channels are transmitted from the access control unit 108, they are output to the time-division multiplex bus 109 at the timing of the corresponding corresponding time-division multiplex slot number.

In the BB-CH unit 105, an information frame composed of a radio frame is, for example, FACCH or S
If it is ACCH, layer 3 in BB-CH section 105
A packet is formed and transmitted via the CPU bus 110 to the BT.
Transfer to S-CNT section 111. Conversely, when transmitting, BT
From the S-CNT unit 111 via the CPU bus 110,
Layer 3 packet (composed of FACCH / SACCH) is BB-CH
Input to the unit 105. Next, the transmission operation will be described.

When transmitting an information frame, the ATM
TCH, USPCH, SCCH, USCCH, BC via the time division multiplex bus 109 from the IF unit 106 or the access control unit 108
Information frames of functional channels such as CH and PCH are transmitted at the timing of the corresponding time-division multiplex slot numbers.
It is input to B-CH section 105. Also, from the BTS-CNT unit 111 via the CPU bus 110, the layer 3
The packet is input to the BB-CH unit 105, and the BB-CH
It is decomposed into FACCH or SACCH in the unit 105. Then, TCH, USPCH, SC input to BB-CH section 105
Information frames of functional channels such as CH, USCCH, BCCH, PCH, FACCH, and SACCH are subjected to convolutional coding and interleaving processing by a channel processing unit 105b in the BB-CH unit 105, and finally to FIG. The indicated packet is formed. At this time, the value of the TYP field suitable for each packet is determined.

Then, FIG. 3 (C) → FIG. 3 (B) → FIG.
Digital data of a radio frame is formed in the order of (A). However, channel / traffic / media information (TY) is added to the digital data at the stage of FIG. 3 (C) → FIG. 3 (B).
P) is given. As a result, media control and channel control can be performed in units of information frames after encoding and in units of slots.

The digital data of the radio frame is transmitted to the baseband processing unit 10 in the BB-CH unit 105.
5a, the signal is transferred to the TRX unit 104, the spectrum is spread by the TRX unit 104, D / A converted,
3 and transmitted from the sector antenna 102 to each sector.

That is, in the CDMA radio communication system according to the first embodiment, an appropriate TYP value, that is, traffic / media information, is determined for the type of the information frame after encoding. Thus, a radio frame is generated by being added to the information frame of the above, so that information of different media and channels can be inserted into one radio frame and transmitted without increasing the code for the control channel.

As described above, according to the CDMA radio communication system of the first embodiment, when a radio frame is received, T is transmitted in the order of FIG. 3 (A) → FIG. 3 (B) → FIG. 3 (C).
Coded Data of equal slots in the YP field are collected (assembled) and assembled to form an information frame having the same channel / media / traffic attribute, while transmitting, as shown in FIG. 3 (C) → FIG. 3 (B). 3) Since the radio frame is formed in the order of FIG. 3A, when performing multimedia communication for simultaneously communicating audio data and image data, one mobile terminal may be configured for each channel type or media type. Audio data and image data can be inserted and transmitted simultaneously in a plurality of different slots, and information transmission efficiency can be improved. In this case, since no new code is set for the channel type or the media type, code resources can be saved.

Further, channel / media control can be performed in units of information frames. Even when the number of control channel codes that can be handled by the present system is smaller than the number of function channels actually used in wireless communication, the channel identifier and the channel identifier can be controlled. The use of the media identifier makes it possible to identify the function channel, save code resources for control channels, increase the number of codes for communication channels, and reduce the circuit size of the base station.

Next, a CDMA radio communication system according to a second embodiment will be described with reference to FIGS. 2, 4 and 5. FIG. 4 is a diagram showing an example of a radio frame / slot configuration transmitted and received between the base station (BTS) 100 and the mobile terminal 101, and FIG. 5 is a diagram showing an example of an information frame communicated by the present system.

The configuration of the CDMA radio communication system according to the second embodiment is the same as that of FIG. 2, and the description of each component is omitted, and the operation will be described below.

In the CDMA radio communication system according to the second embodiment, media control and channel control are performed in units of radio frames or in units of information frames before being encoded.

As shown in FIG. 4 (A), the radio frame is composed of a total of 16 slots # 0 to # 15. Assuming that the transmission rate per frame is, for example, 10 msec, the transmission rate per slot is 0.625 msec, as shown in FIG. Each slot #
0 to slot # 15 include a Pilot signal field, a transmission power control signal (TPC) field, a Coded Data field,
It is configured in the order of the pilot signal field.

At the time of reception, FIG.
In each slot constituting the radio frame shown in FIG.
Coded Data to be inserted into the Coded Data field is assembled in order, and the Coded Data as shown in FIG.
A bit string of only a set is formed.

Then, this bit sequence is deinterleaved and Viterbi-decoded, and the sequence shown in FIGS.
), (C) and (d) are converted into information frames representing functional channels.

The information frame shown in FIG. 5A is composed of TCH, SA
This is an information frame representing CCH and FACCH. The information frames shown in FIG. 5B and FIG. 5B ′ are information frames representing USPCH. The information frame shown in FIG. 5 (b) is provided with an SN (sequence number) field. If a code number is used instead of the SN in the case of multi-code transmission, as shown in FIG. 5 (b '). The SN field becomes unnecessary. The information frame shown in FIG. 5C is a super frame (LCCH frame) used for a downlink control channel. The information frame shown in FIG. 5D is a super frame (LCCH frame) used for the uplink control channel.

FIGS. 5 (a), 5 (b), 5 (b '),
A TYP field exists at the head of the information frame of the functional channel as shown in (c) and (d).

In this TYP field, bits representing the (1) channel identifier (2) media identification information (CBR / VBR / UBR / ABR) (3) traffic type (CO / CL) of the information frame in an integrated manner The column is inserted. This bit sequence is called a channel identifier. At the time of transmission, as shown in FIGS. 5 (a), 5 (b), 5 (b '), 5 (c) and 5 (d), the TYP value according to the type of the medium and the channel is added to the first TYP field. Is convolutionally coded and interleaved to form a radio frame in the order of FIGS. 4 (C), (B) and (A).

Here, other than the above information frame will be described with reference to FIG.

Here, only the differences from the example of the information frame shown in FIG. 5 will be described.

In this case, (a), (b) and (b) of FIG.
'), (C), and (d), the channel identifier CI field is set at the position of the TYP field of the information frame of the functional channel, and is separately from the channel identifier CI field. As shown in (b),
An MI field is provided.

In this MI field, a bit string that indicates the type of (1) media identification information (CBR / VBR / UBR / ABR) (2) traffic type (CO / CL) of the information frame is inserted. . This bit sequence is called a media identifier. Hereinafter, in the CDMA wireless communication system of the second embodiment, a base station (BTS)
The operation of transmitting and receiving the information frames of FIGS. 5 and 6 using the wireless frame of FIG. 4 will be described.

First, the receiving operation will be described.

In this case, when a radio signal transmitted from mobile terminal 101 is received by sector antenna 102 in FIG.
Carrier) signal passes through the AMP section 103 and the TRX section 10
A / D after quasi-synchronous detection in TRX section 104
It is converted and input to BB-CH section 105. And
Via the baseband processing unit 105a of the BB-CH unit 105, digital data is input to the channel processing unit 105b in the form of a radio frame as shown in FIG.

Then, the channel processing unit 105b decomposes the input radio frame for each slot, and
(B) → As shown in FIG. 4 (C), Pilot / TPC is deleted, Coded Data of each slot is assembled, and deinterleaving and Viterbi decoding are performed to generate an information frame.

The channel processing unit 105b identifies the type of the channel or the medium by the traffic / media type (the identifier value of the TYP field in FIG. 5, the identifier value of the CI field in FIG. 6, and the identifier value of the MI field). , Deletes traffic / media information, identifies control / user information (functional channel), etc., and based on the identification result, determines the transfer destination of the information frame to the ATM I
Selection is made from the F section 106, the access control section 108, and the BTS-CNT section 111.

The subsequent processing is the same as in the first embodiment.

Next, the transmission operation will be described.

At the time of transmission, the information frames of the functional channels TCH, USPCH, SCCH, USCCH, BCCH and PCH are transmitted from the ATM IF unit 106 or the access control unit 108 via the time division multiplex bus 109 to the corresponding time division It is input to BB-CH section 105 at the timing of the multiplex slot number. Also, the BTS-CNT unit 111 outputs the CP
Via the U bus 110, the layer 3 packet is BB-C
Input to H section 105, and FACCH in BB-CH section 105.
Or decomposed into SACCH. Then, TCH, USPCH, SCCH, USCCH, BC input to BB-CH section 105
The information frames of the functional channels of CH, PCH, FACCH, and SACCH are shown in FIG. 4C after being subjected to TYP information addition, convolutional coding, and interleaving by the channel processing means in the BB-CH unit 105. A packet is formed. Then, digital data of the radio frame is formed in the order of FIG. 4 (C) → (B) → (A). The digital data of this radio frame is BB-CH
The signal is transferred from the baseband processing section 105a in the section 105 to the TRX section 104, where the spectrum is spread and the D /
The signal is A-converted, transmitted to the AMP unit 103, and transmitted to each sector from the sector antenna 102.

Here, if the number of codes that can be handled by one base station is N and the number of codes for the control channel is M out of the total number N of codes, the number of codes that can be allocated for the communication channel is The number is (N−M).

Therefore, in order to increase the number of codes for communication channels, the number of codes for control channels must necessarily be reduced.

If the number N of channel codes that can be handled by the base station is larger than the number of function channels, all the function channels can be classified / identified by the code. Communication is possible without using a media identifier.

However, if it is desired to reduce the number of control channel codes as much as possible in order to save code resources or increase the number of communication channel codes, or if the number of channel codes that can be handled by the base station is smaller than the number of functional channels. As in the present invention, it is impossible to identify all functional channels without using a channel identifier / media identifier. That is, according to the present invention, code resources can be saved. CDMA of the second embodiment
According to the wireless communication system, the TYP field in FIG. 5 or the C in FIG.
4 (C) → FIG. 4 (B) → FIG. 4 (A) by forming convolutional coding and interleaving of information frames with identifiers (bit strings) assigned to the I and MI fields. Therefore, media control and channel control can be performed in units of radio frames or in units of information frames before being encoded. When a TYP field is provided in each slot as shown in FIG. 3B, media multiplexing and channel multiplexing at a slot level coded in a radio frame can be performed as in the first embodiment.

Next, a third embodiment according to the wireless communication system of the present invention will be described with reference to FIG. FIG. 7 is a diagram illustrating a configuration of a CDMA wireless communication system according to a third embodiment of the present invention. Here, only the differences from the first embodiment (FIG. 2) will be described.

In the first embodiment (FIG. 2), BB-CH
Although the unit 105 has the function of assembling / disassembling the layer 3 packet, in the third embodiment, the BTS-CNT unit 21
1 has a function of assembling / disassembling a layer 3 packet.

In the first embodiment, the BB-CH unit 1
FACCH or SACCH, which is part of the 05 feature
A packet of layer 3 is formed from the information frame of the BTS-CNT unit 111 via the CPU bus 110.
In the CDMA wireless communication system of the second embodiment, the BB-C
The information frame obtained in H section 205 is FACCH or SAC
In the case of the CH, the BB-CH unit 205 transfers the information frame to the BTS-CNT unit 211 via the time division multiplex bus 109. Conversely, when transmitting, the BTS-CNT
From the unit 211 via the time division multiplex bus 109
, SACCH information frames are input to the BB-CH unit 205. Other operations are the same as those in the first embodiment.

According to the CDMA radio communication system of the third embodiment, the same effects as those of the first and second embodiments can be obtained, and the BB-CH unit 205 transmits
Since the packet assembly / disassembly function has been eliminated, BB-CH
The load on the processing of the unit 205 can be reduced.

[0097]

As described above, according to the present invention, in performing multimedia communication, when one terminal simultaneously transmits and receives slots of a plurality of channel types or a plurality of media types, channel resources are saved. In addition, the information transmission efficiency can be improved. According to the present invention,
Channel / media control can be performed in information frame units, and channel identifiers and media identifiers can be used even when the number of control channel codes that can be handled by this system is smaller than the number of function channels actually used in wireless communication. Thus, the function channel can be identified, the code resources for the control channel can be saved, and accordingly, the number of codes for the communication channel can be increased and the circuit scale of the base station and the mobile terminal can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a functional channel in an air interface between a radio base station and a mobile terminal according to the present invention.

FIG. 2 is a diagram showing a configuration of a wireless communication system according to the first embodiment of the present invention.

FIG. 3A is a diagram showing a configuration of a wireless frame used for a first operation example in the wireless communication system according to the first embodiment; FIG. 2B is a diagram illustrating a configuration of each slot of the wireless frame in FIG. (C) is a diagram showing information frames collected from each slot and collected.

FIG. 4A is a diagram showing a configuration of a wireless frame used for a second operation example in the wireless communication system according to the first embodiment; FIG. 2B is a diagram illustrating a configuration of each slot of the wireless frame in FIG. (C) is a diagram showing information frames collected from each slot and collected.

FIG. 5A is a diagram showing an example of the configuration of an information frame representing TCH, SACCH, and FACCH. (B) is a figure showing an example of the composition of the information frame showing USPCH. (B ') is a diagram showing an example of the configuration of an information frame representing USPCH in the case of multicode transmission. (C) is a diagram showing a superframe. (D)
FIG. 3 is a diagram showing an SCCH uplink control channel.

FIG. 6A is a diagram showing another example of the information frame representing TCH, SACCH, and FACCH in FIG. 5; (B) is a figure showing another example of the information frame showing USPCH of Drawing 5.

FIG. 7 is a diagram showing a configuration of a CDMA wireless communication system according to a second embodiment of the present invention.

[Explanation of symbols]

100: base station (BTS), 101: mobile terminal, 102
... Sector antenna, 103 ... Transmission / reception amplifier (AMP)
), 104 ... Radio section (TRX section), 105, 205 ...
BB-CH section, 105a, 205a ... baseband processing section, 105b, 205b ... channel processing section, 105c,
205c: Correspondence table, 106: ATM interface unit (ATM IF unit), 107: VPI / VCI table, 108: Access control unit, 109: Time division multiplex bus, 110: CPU bus, 111, 211: Wireless base station control unit .

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Atsushi Miki, Inventor 1 at Komukai Toshiba-cho, Saiwai-ku, Kawasaki City, Kanagawa Prefecture Inside the Toshiba Research and Development Center Co., Ltd. No. 1 town Toshiba R & D Center

Claims (10)

[Claims] 1. A wireless communication system in which at least one distributed base station and a mobile terminal perform information communication by a code division multiple access (CDMA) method using a plurality of slots of a wireless frame. Means for dividing the first information and the second information so that each falls within the communication band of at least each slot; means for assigning a unique identifier to each of the divided first information and second information Multiplexing means for multiplexing the first information and the second information, each of which is respectively assigned a unique identifier, in the radio frame in slot units, and multiplexing the radio frame multiplexed in slot units by the multiplexing means. A wireless communication system comprising: wireless transmission means for performing wireless transmission. 2. A wireless communication method in which at least one distributed base station and a mobile terminal perform information communication by a code division multiple access (CDMA) method using a plurality of slots of a wireless frame. Dividing the first information and the second information into the communication band of at least each slot, and assigning a unique identifier to each of the divided first information and second information. Multiplexing the first information and the second information, each of which is provided with a unique identifier, in the radio frame in slot units, and wirelessly transmitting the radio frame in which the information is multiplexed in the slot units Wireless communication method. 3. At least one distributed base station and a mobile terminal set a control channel and a communication channel in a plurality of slots of a radio frame, and use the respective channels to perform code division multiple access (CDMA). A wireless communication system for performing information communication according to a method, a receiving unit that receives the wireless frame, and a unit that extracts information of a control channel and a communication channel from each slot of the wireless frame received by the receiving unit. Wireless communication characterized by comprising: means for collecting information on the control channel and the communication channel having the same identifier assigned to each other; and means for assembling the collected information into an original unit. system. 4. At least one distributed base station and a mobile terminal set a control channel and a communication channel in a plurality of slots of a radio frame, and use the respective channels to perform code division multiple access (CDMA). A wireless communication method for performing information communication by a method, a step of receiving the wireless frame, a step of extracting information of a control channel and a communication channel from each slot of the received wireless frame, and a step of extracting the control channel and A wireless communication method comprising: a step of collecting information of communication channels having the same identifier assigned to each other; and a step of assembling the collected information into an original unit. 5. A wireless communication system in which at least one base station and a mobile terminal, which are distributed and arranged, communicate information by a code division multiple access (CDMA) method using each slot of a wireless frame. The first information and the second information different from the first information
Identifier assigning means for assigning a unique identifier to each piece of information; encoding means for encoding each of the first and second information to which the unique identifier is assigned by the identifier assigning means; The first and second encoded by
Wireless transmitting means for dividing the information of each of the above in accordance with the respective information amounts, putting the information in each slot, and wirelessly transmitting the information in units of the wireless frame; receiving means for receiving the wireless frame transmitted by the wireless transmitting means; The encoded information of the radio frame received by the receiving means is decoded in the unit, and the first information and the second
Means for summarizing the first information and the second information, respectively.
Means for performing processing according to the identifier. 6. A wireless communication method in which at least one distributed base station and a mobile terminal communicate information by a code division multiple access (CDMA) method using a plurality of slots of a wireless frame, The first information and the second information different from the first information
Assigning a unique identifier to each of the information items; encoding the first and second information items each having the unique identifier; encoding the first and second encoded information items; Dividing the radio frames into slots according to the respective information amounts and wirelessly transmitting the radio frames in units of the radio frames; receiving the radio frames transmitted by radio; and code of each slot of the received radio frames. Decoding the encrypted information and summarizing the first information and the second information for each identifier;
Performing a process according to the identifier. 7. A wireless communication system in which at least one base station and a mobile terminal that are distributed and arranged communicate information by a code division multiple access (CDMA) method using a plurality of slots of a wireless frame, The first information and the second information different from the first information
Are respectively encoded to obtain first encoded information and second encoded information.
Encoding means for generating the first encoded information and the second encoded information; and an identifier assigning means for assigning a unique identifier to each of the generated first encoded information and the second encoded information. Wireless transmitting means for transmitting the encoded first and second information in a slot together with the identifier in accordance with the amount of information in each of the radio frames, and the radio transmitting means; Receiving means for receiving the wireless frame transmitted by the first and the second encoded information, wherein the encoded information of each slot of the wireless frame received by the receiving means has the same identifier; And a decoding unit that decodes the first encoded information and the second encoded information that are respectively aggregated. Line communication system. 8. A wireless communication method in which at least one base station and a mobile terminal distributed and arranged perform information communication by a code division multiple access (CDMA) method using a plurality of slots of a wireless frame, The first information and a second information different from the first information
Are respectively encoded to obtain first encoded information and second encoded information.
Generating unique encoded information; assigning unique identifiers to the generated first encoded information and second encoded information; and generating a first identifier associated with each unique identifier. And the second
Dividing the coded information according to the respective information amounts, inserting the coded information into a slot together with an identifier, and wirelessly transmitting the wireless frame unit, and receiving the transmitted wireless frame; and Combining the coded information of each slot into first coded information and second coded information that have the same identifier; respectively, the first coded information and the second code Decoding the encrypted information. 9. At least one base station and a mobile terminal, which are distributed and arranged, set a control channel and a communication channel in a plurality of slots of a radio frame, and code-division multiple access an information frame using each channel. (CD
MA) a wireless communication method for performing communication according to a method, wherein when the base station and the mobile terminal transmit the wireless frame, dividing information frames of different channel types / media types for each of the slots; A step of adding a unique channel identifier or a media identifier set for each type and multiplexing and transmitting the radio frame with the radio frame, and forming each of the radio frames when the transmitted radio frame is received. A wireless communication method comprising: collecting information whose slot channel identifiers or media identifiers match; and assembling the collected individual information into an information frame. 10. At least one distributed base station and a mobile terminal set a control channel and a communication channel in a plurality of slots of a radio frame, and code-division multiple access an information frame using each channel. (C
In a wireless communication system that performs communication according to a DMA (DMA) scheme, at least the base station of the base station and the mobile terminal responds to a type of a channel identifier or a media identifier assigned to an information frame to be transmitted or received according to the type. Wireless communication system comprising a channel processing means for executing different processing.