JP2000224231A - Mobile communication system and packet data transmission method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packet data communication service to many more users by effectively utilizing a radio resource in reservation access type packet data communication on a CDMA mobile communication system. SOLUTION: In a packet data communication method in a CDMA mobile communication system, a traffic channel is time-divided, traffic channel that is time-divided is assigned to a plurality of mobile stations during connection and packet data are sent/received between a base station and mobile stations 101-103 within the assigned time by using the assigned traffic channel. The base station decides priority for each of packet data that are sent/received and the traffic channel faster and longer is assigned to the packet with higher priority. The base station indicates the operating traffic channel and the assigned time to an opposite mobile station for each of the sent/received packet data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a CDMA (Code Diode).
The present invention relates to a packet data transmission method for performing reservation-type access control on a mobile communication system.

[0002]

2. Description of the Related Art In a conventional mobile communication system mainly intended for voice communication by a portable telephone or the like, a communication is made between a base station and a mobile station by calling from a mobile station or calling the mobile station from a base station. A channel is established and held during a call, and a communication channel is released at the end of the call.

[0003] Also, when attempting to perform packet data communication by connecting to a packet data communication network via a mobile station terminal, a communication channel is established between the mobile station and the base station in the same procedure as a normal voice call. However, this is maintained until the end of packet data communication.

However, in a general usage environment of a packet data communication service, it is rare that packets are constantly transmitted and received between a mobile station and a base station, and usually intermittently after a long inactive period. Show a bursty traffic pattern where packets are transmitted. In other words, the interval between packet transmissions is large, and the communication channel remains secured even when it is not used, which is a great waste of radio resources. Therefore, instead of always occupying a specific communication channel between a mobile station and a base station that intend to perform packet data communication, when a packet that needs to be transmitted occurs at the mobile station, the mobile station and the base station An on-demand channel assignment scheme for setting a packet data transmission channel during the period has been devised.

For example, in Japanese Patent Application Laid-Open No.
1 shows a packet data communication method in a communication system A. This is because a mobile station having a packet to be transmitted sends a packet data transmission request on an access channel, and the base station responds to the channel (CDM) to be used by the mobile station.
A spreading code in A communication) and transmission timing are instructed, and the mobile station transmits a packet according to the instruction.

[0006]

However, even when a channel is allocated every time a packet occurs as described above, the TC
In the transmission of a packet of a relatively large size used in P / IP communication or the like, since the channel is occupied by one mobile station until the end of the transmission, it is used for voice communication as the base station accepts a packet data communication service request. The number of possible channels is also reduced, and the number of users that can be accepted for both packet data communication service requests and voice call service requests is limited, and the connection cannot be refused for requests larger than that.

In communication by the CDMA system, a channel is generated by a spreading code and information to be transmitted is scrambled. The types of orthogonal codes having no mutual interference are limited. When individual PN (pseudo-noise) codes are used, the number of mobile stations used at the same time, that is, the number of channels, is caused by problems such as interference between channels resulting in degradation of communication quality and channel interference between cells. Need to be suppressed as much as possible.

Further, in the conventional reservation type packet communication system, the method of creating a channel use schedule of each mobile station is also simple in that the channels are allocated to empty channels in the order of generation of transmission requests, and the channel of each packet data communication service user is used. With regard to the use time of, scheduling has not been performed in consideration of, for example, an improvement in throughput of the mobile communication system as a whole. In addition, since all transmission requests are treated equally, it was not possible to respond to the service quality according to the user.

Accordingly, the present invention is a packet data transmission system for improving radio resource utilization efficiency in a CDMA mobile communication system, and has an object to reduce the number of communication channels used simultaneously for packet data communication.
An object of the present invention is to provide an MA mobile communication system.

Another object of the present invention is to provide a CDMA mobile communication system in which the packet communication throughput is improved so that more packet data communication service requests can be accepted without lowering the communication quality of the entire system. It is in.

Another object of the present invention is to provide a CDMA mobile communication system capable of flexibly coping with a service quality required by each user of packet data communication or a type of a packet to be transmitted. is there.

[0012]

In order to achieve the above object, the present invention provides a CDMA mobile station in which a service area is composed of a plurality of radio zones, and a base station disposed in each zone communicates with a plurality of mobile stations. In a communication system, a reservation-type access scheme packet in which a base station determines a channel and timing schedule for transmitting and receiving packet data and notifies the mobile station of the timing, and the mobile station and the base station transmit and receive packet data according to the schedule. It relates to a data communication method.

In creating the packet transmission / reception schedule, the base station determines the priority for each packet transmitted between the base station and the mobile station. At the same time, the number of mobile stations that perform packet transmission and reception, that is, the number of channels, is limited. If there is a packet transmission / reception request that exceeds the number of usable channels, the request is accepted, but transmission is permitted with priority given to the higher priority packet. Also, the length of time in which the mobile station uses the channel for transmitting and receiving the packet is limited in length in proportion to the priority of the packet.

Each mobile station transmits and receives packets within the time limit. If the transmission and reception of the packet are not completed within one time limit, the packet is transmitted in a plurality of times. The transmitting side transmits an identifier indicating the original packet and a sequence number for each divided unit, and the receiving side reconstructs the original packet using the identifier and the sequence number. The channel used by each mobile station and the time limit are not fixed, but the availability of the channel, the base station at that time ~
It is assumed that the packet is assigned for each transmission according to the priority of a packet which dynamically changes depending on the communication quality of the transmission path between mobile stations.

The priority for each packet is determined by the base station in consideration of improving the packet transmission / reception throughput of the entire system or responding to the service quality requirement of each packet data communication service user. .

For the purpose of improving the packet transmission / reception throughput, the factors that determine the priority of each packet are the size of the packet data, the quality of the communication quality of the transmission path, the base station and the mobile station. And the frequency of occurrence of packets transmitted between them. Since these factors can change over time as the packet is transmitted, the priority of each packet also changes dynamically for each divided portion.

For the purpose of responding to the service quality requirement for each packet, the factors determining the priority of each packet are the contract conditions of the user of the packet data communication service of the mobile station and the sender when transmitting the packet data. , A service quality request required according to the type of packet, and the like. The base station acquires the contract conditions of the packet data communication service user from the management database of the packet data communication service user.
The service quality requirement of the packet sender and the type of the packet are set in the header of the packet, and the base station and the mobile station read the information.

The present invention provides a CDMA system for achieving the above object.
A packet data communication method in a mobile communication system, wherein a traffic channel is time-divided, the time-divided traffic channel is assigned to a plurality of connected mobile stations, and the assigned traffic channel is used to allocate time. Within this, packet data transmission / reception between the base station and the mobile station is performed.

The base station instructs the partner mobile station on the traffic channel to be used and the assigned time for each packet data to be transmitted and received.

Further, the packet data is divided into a plurality of blocks, and if all the blocks cannot be transmitted / received within the allocated time, the base station re-assigns the traffic channel used and the allocated time to transmit / receive the remaining blocks. To instruct.

Further, the base station determines a priority for each packet data to be transmitted and received, and allocates a traffic channel earlier and longer to packet data having a higher priority.

Further, the priority is determined by at least one of the size and type of packet data to be transmitted.

Further, the priority is determined by a partner mobile station that performs packet transmission and reception.

Further, the priority is determined by the communication quality of the transmission path.

Further, the priority is determined by the transmission completion ratio of the packet data.

Further, the packet data is divided into a plurality of blocks, and if all the blocks cannot be transmitted / received within the allocated time, an instruction is given at the time of the first block transfer using the traffic channel used at the time of the first block transfer. The transmission and reception of the remaining blocks are performed at the time allocated for each transmission and the cycle determined for each channel.

A packet communication system according to the present invention includes a base station connectable to a packet network, and a mobile station connectable to an information processing apparatus, wherein the base station divides a traffic channel by time, and Means for allocating the time-divided traffic channel to the mobile station, means for transmitting and receiving packet data to and from the mobile station within the allocated time using the allocated traffic channel, and means for transmitting and receiving packet data to and from the packet network And means for performing format conversion of packet data to be transmitted to and received from the mobile station and packet data to be transmitted and received to and from the mobile station, wherein the mobile station uses the traffic channel allocated by the base station, Means for transmitting and receiving packet data, means for transmitting and receiving data to and from the information processing apparatus, Comprising means for performing format conversion of the data to be packet data and the information processing apparatus and reception for transmitting and receiving and the earth station.

Further, the packet data communication program for mobile station receives the notification of the traffic channel and the allocated time from the base station when transmitting and receiving the packet data, and uses the traffic channel allocated by the base station to transmit the notification within the allocated time. It includes instructions for performing packet data transmission / reception with the base station, converting the format of packet data transmitted / received with the base station and data transmitted / received with the information processing device, and executing the steps of transmitting / receiving data with the information processing device.

Further, the present invention is a base station packet data communication program, which stores a packet data transmission / reception schedule with a connected base station, and time-divides a traffic channel according to the stored packet data transmission / reception schedule. Allocate the time-divided traffic channel to the middle mobile station, notify the mobile station, use the allocated traffic channel to transmit and receive packet data to and from the mobile station within the allocated time, and transmit and receive to and from the mobile station. It includes an instruction to convert the format of packet data to be transmitted / received to / from a packet network, and to execute a step of transmitting / receiving packet data to / from a packet network.

Further, the above-described base station or mobile station packet data communication program is stored in a storage medium.

[0031]

Embodiments of the present invention in a CDMA communication system will be described below with reference to the drawings. However, the wireless channel configuration, the format of various messages, the functional block configuration of the device, and the like shown here are examples in the embodiment of the present invention, and are not strictly specified here.

(1) Overall Configuration FIG. 2 shows a configuration example of a mobile communication system. The wireless service providing area is divided into a number of cells (zones) 201, 202, etc., and mobile stations 211 to 214 in the cells communicate via base stations 221, 222 existing in each cell. When using the packet data communication service, the mobile station is connected to information devices 231 to 233 such as portable information terminals having a packet data communication application. The base station is also connected to an external existing packet data communication network (Internet) 251 via an inter-base station data communication network 241, and similarly a local packet data communication network 26.
Packet data communication is performed between the information devices 271 to 274 and the portable information terminals 231 to 233 connected to the data communication network 251 via the mobile communication terminals 1 and 262 or between the portable information terminals using a protocol such as TCP / IP. Will be

(2) Configuration of Radio Channel Next, a configuration example of the radio channel used in the present embodiment is shown in FIG.
Shown in In CDMA communication, a code channel is generated by dividing one carrier (frequency) using a spreading code, an orthogonal code, or the like.

A downlink channel 301 for transmitting a signal from one base station to each mobile station is code-divided by an orthogonal code represented by a Walsh code, and a pilot channel 302 for transmitting a base station identification signal. ,
A synchronization channel 303 for synchronizing the system and transmitting system information, a paging channel 304 for calling the mobile station, and a packet control channel 30 for giving a packet transmission instruction or a reception instruction to the mobile station.
5. Allocated to a traffic channel 306 for transmitting voice and packet data to the mobile station.

The information transmitted on these channels is multiplied by a PN (pseudo-noise) code (so-called short code) having a different offset for each base station, and is transmitted to each mobile station transmitted on a traffic channel. The information is further scrambled by multiplication of a unique PN code (so-called long code) for each partner mobile station.

In order to improve the efficiency at the time of giving a packet transmission or reception instruction to a plurality of mobile stations, one or more packet control channels are secured according to the traffic volume of the packet. In this case, the packet control channel to be received by each mobile station is notified from the base station to each mobile station via a paging channel.

Similarly, an uplink channel 311 for transmitting a signal from a mobile station to a base station also has an orthogonal code or a channel number and a P which has a unique offset for each partner base station.
An access channel 312 that is code-divided by the N code and that originates a call from the mobile station, and a packet reservation channel 3 that notifies a base station of a packet transmission request from the mobile station
13. Assigned as a traffic channel 314 for transmitting voice and packet data.

In order to suppress the probability of collision between packet reservation messages from a plurality of mobile stations, one or more packet reservation channels are reserved according to the traffic volume of packets. A packet reservation channel to be used by each mobile station is notified from the base station to each mobile station via a paging channel.

The traffic channel is used for voice or packet data communication. In this embodiment, priority is given to securing a voice communication channel, and the remaining traffic channels not used for voice communication are used as packet channels. use. The number of traffic channels and the proportion of packet channels in the traffic channels can be dynamically changed according to the traffic volume and the content of the traffic.

Various channels other than the above carrier division method, packet control channel and packet reservation channel are based on the US CDMA cellular radio communication system standard.
Also known as TIA / EIA / IS-95.

As described above, the number of channels per carrier is limited by the number of orthogonal codes, and is 64 for Walsh codes. In this embodiment, a limited number of traffic channels are allocated to a plurality of connected mobile stations in a time-sharing manner, and a limited number of traffic channels are effectively used.

(3) Configurations of Base Station Device and Mobile Station Terminal The configurations of the base station device and the mobile station terminal in the mobile communication system according to the present embodiment are shown. FIG. 7 shows a functional block configuration of a base station device in a mobile communication system according to the present invention. However, functions for voice communication are not shown. Base station device 70 shown in FIG.
The signal received by the first antenna unit 702 is amplified and demodulated by an amplifier 704 and a demodulator 705 in a receiving unit, and then transmitted to a despreader 707 using a spreading code for each channel generated by a code generator 706. The packet is despread and separated into a packet reservation channel and a packet channel. Further, the call quality such as the Eb / No ratio and the S / N ratio are measured by the call quality measuring device 708.

The packet data divided and received from the mobile station is reconstructed on the packet temporary storage memory 717 and transmitted to the external data communication network through the data communication network interface 718. The packet arriving from the external network is temporarily stored in the packet temporary storage memory 717, where the packet is divided into blocks, which are transmission units (described later).

The information on the user of the packet data communication service obtained from the user information management database 713, the packet channel reservation information obtained on the packet reservation channel, and the information of the packet arriving from the external data communication network are stored in the packet control unit. The channel management schedule stored in the packet management information storage memory 714 is notified to the channel control unit 716 based on the information, and the channel control unit controls the transmission unit and the reception unit based on the schedule. I do.

A message and packet data to be transmitted to the mobile station are multiplied by a spreading code corresponding to a packet control channel and a packet channel in a transmitting section in a spreader 710, and then passed through a modulator 711 and an amplifier 712 from an antenna section 702. Sent to mobile station.

Portions other than the packet control units (714, 715, 717) and the data communication network interface 718 are also used for voice communication. The MPU 715 determines whether to use voice communication or packet data communication when connecting the base station and mobile station,
Switch the data path in the base station.

FIG. 8 shows a functional block configuration of a mobile station terminal in the mobile communication system according to the present embodiment. Antenna section 802 of mobile station terminal 801 shown in FIG.
Are amplified and demodulated by an amplifier 804 and a demodulator 805 in a receiving section,
6, and is despread by a despreader 807 using the spreading code for each channel, and separated into a packet control channel and a packet channel. In addition, the call quality measuring device 80
At 8, the speech quality is measured.

The channel control unit controls the transmitting unit and the receiving unit to transmit and receive packet data based on an instruction from the base station that receives on the packet control channel. The packet data divided and received from the base station is reconstructed in the packet temporary storage memory 817, and the terminal connection interface 818
To the mobile information terminal. The packet passed from the portable information terminal is stored in a temporary packet storage memory 817.
Is temporarily stored, and division into transmission units is performed here.

The message and the packet data to be transmitted to the base station are multiplied by a spread code corresponding to the packet control channel and the packet channel in the transmission section in the spreader 810, and then transmitted from the antenna section 802 through the modulator 811 and the amplifier 812. Sent to the station.

Portions other than the packet control units (815, 817) and the terminal connection interface 818 are also used for voice communication. The MPU 815 determines whether voice communication or packet data communication is performed when the base station and the mobile station are connected, and switches the data path in the mobile station. Note that the mobile station and the information terminal may be integrated.

Both the base station device and the mobile station terminal have clocks,
Adjustment is performed using a synchronization channel and a pilot channel so that both times coincide.

(4) Packet Division If the packet to be transmitted by the mobile station and the base station is, for example, a TCP / IP packet, it is composed of a header part and a data part as shown by 501 in FIG. The packet is divided by the transmitting side device, stored in a plurality of blocks 511 to 513, and transmitted on a packet channel. Each block is added with a packet identifier indicating the original packet, a sequence number indicating the arrangement position of the blocks, and an error detection CRC code. For example, in FIG. 5, a packet identifier 521, a sequence number 531, and a CRC code 561 are added to data 541 that is a part of the original packet, to form a packet data block 511.

The packet identifier is determined by the transmitting device,
For example, it is an integer that is incremented for each packet transmission. Packet identifiers 521, 522, 523 of blocks 511 to 513 divided from one packet 501
Is the same.

The sequence numbers of the respective blocks are assigned in descending order with the number of the first block 511 being (total number of blocks minus 1), and 0 is set as the sequence number of the last block 513. The receiving side reconstructs the original packet 501 based on the sequence number and the packet identifier. When a part of the data being transmitted is lost due to a failure in the wireless section, retransmission processing can be performed in units of this block. The sequence number allows the receiving side to know the remaining size of the packet data being received, and the receiving side also knows that the reception of a block having a sequence number of 0 has completed the reception of one packet. It has become.

Since the lengths of the blocks are all the same, if the length of the data to be contained in the last block is not enough, the data is padded and transmitted on the transmitting side as shown by padding 551 in FIG. . It is deleted when the packet is reassembled on the receiving side.

(5) Packet Data Communication Sequence Next, the outline of a packet data service connection sequence before performing packet data communication between the mobile station and the base station will be described with reference to the drawings. This sequence is the same as the calling and incoming call procedures of the conventional voice communication, and therefore detailed description is omitted.
First, FIG. 9 shows a packet data service connection sequence when started by a request from a mobile station. A mobile station that intends to use the packet data service issues a service connection request 901 to the base station on the access channel. Based on this connection request, the base station can determine whether it is voice communication or packet data communication. The base station responds by notifying the service connection permission 902 on the paging channel and specifying the channel to be used by the mobile station. In voice communication, a traffic channel is specified at this time. When performing packet data communication, the base station specifies a packet control channel and a packet reservation channel to be used by the mobile station.

FIG. 10 shows a packet data service connection sequence in the case of calling from a base station. The base station, from which the packet addressed to the mobile station existing in the cell managed by the external data communication network arrives, calls the mobile station on the paging channel as shown in FIG. The mobile station receiving the call 1001 returns a response on the access channel. The base station responds to the call 100
2 returns from the mobile station, thereby notifying the service connection permission 1003 on the paging channel. In this notification, the base station notifies the mobile station that packet data communication will be performed, and specifies a packet control channel and a packet reservation channel to be used by the mobile station.

As described above, these processing sequences are in accordance with the processing of calling and receiving calls for voice communication according to the prior art. However, instead of specifying a traffic channel as in voice communication, the base station performs communication with the mobile station. Indicates the packet control channel and packet reservation channel to be used.

After the packet data communication service connection processing shown in FIG. 9 or FIG. 10 as described above, the mobile station and the base station perform the processing shown in FIG. 11 or FIG. 12 every time a packet to be transmitted occurs.

FIG. 11 shows a sequence for transmitting a packet from a mobile station to a base station. The mobile station receiving the packet data from the portable information terminal makes a packet reservation message 11
01 on the packet reservation channel and requests the base station to allocate a packet channel. On the other hand, the base station returns a packet transmission instruction message 1102 including an instruction of the channel and the assigned time on the packet control channel. The mobile station having received the packet data according to the instruction, the packet data block group 1103 divided in the format shown by 511 in FIG.
Is transmitted to the base station on the designated packet channel within the designated allocation time. If the packet transmission is not completed within the allotted time, the base station notifies the mobile station again of a packet transmission instruction message 1104 indicating the channel for the next transmission and the allotted time. The procedure 1106 shown in FIG. 11 is repeated until the base station receives the last block of.

FIG. 12 shows a sequence when a packet is transmitted from the base station to the mobile station.

The base station transmitting a packet received from the external data communication network to the mobile station notifies the mobile station of a packet reception instruction message 1201 on the packet control channel, whereby the mobile station should receive the packet. Indicate the packet channel and assigned time.

The base station divides the packet into blocks as shown at 511 in FIG. 5, and transmits the packet on the designated packet channel within the time designated to the mobile station. The mobile station receives the packet data block group 1202 on the designated channel for the assigned time according to the packet reception instruction message. If the packet transmission from the base station is not completed within the allotted time, a packet reception instruction message 1203 is notified from the base station to the mobile station again.
The procedure 1205 shown in FIG. 12 is repeated until the mobile station receives the last block of the divided packet. Figure 11,
In both cases of FIG. 12, a predetermined time or more,
If the packet is not transmitted, the connection between the base station and the mobile station is disconnected by the existing disconnection sequence.

FIG. 4 shows the format of various messages transmitted on the above-mentioned radio channel.

The packet reservation message 411 includes a preamble 412 for synchronization acquisition at the base station, an identifier 413 indicating the source mobile station, an identifier 414 of the packet to be transmitted, and the source mobile station wishing for the packet. Priority 415, packet size 416, and error detection CRC code 41 for confirming at the base station that the packet reservation message has been successfully received.
7 is included. The mobile station updates the packet identifier each time it transmits a packet reservation message 411 in an attempt to transmit a new packet.

The packet transmission instruction message 421 includes a preamble 422 for synchronization acquisition, a mobile station identifier 423 indicating the destination of the message, a packet identifier 424 for identifying a packet to be transmitted to the mobile station, and the mobile station starting transmission of the packet. The designation 425 of the time to be performed, the designation 426 of the channel allocation time, the designation 427 of the packet channel to be used, and the error detection CR for confirming at the mobile station that the packet transmission instruction has been normally received.
C code 428 is included. The mobile station identifier 423 and the packet identifier 424 include the mobile station identifier 41 set in the packet reservation message corresponding to this message.
3 and the same value as the packet identifier 414 are set.

Similarly to the packet transmission instruction message 421, the packet reception instruction message 431 includes a preamble 432 for synchronization acquisition, a mobile station identifier 433 indicating the destination of the message, an identifier 434 of the packet to be received by the mobile station, a packet size 435, A time 436 at which the mobile station should start receiving packet data, a channel allocation time 437, a packet channel 438 to be used, and an error detection for the mobile station to confirm that the packet reception instruction has been normally received. CRC code 439 is included. The base station updates the packet identifier 434 each time a packet to be transmitted to the mobile station occurs and a packet reception instruction message is transmitted to the mobile station.

(6) Packet Channel Allocation FIG. 1 shows an example of using each channel when transmitting packet data from a mobile station.

The mobile station 101 which has received the packet from the connected portable information terminal notifies the base station of a packet reservation message 121 via the packet reservation channel 112.
The base station receives the packet reservation message from each mobile station, creates a channel allocation schedule, determines a packet channel 115, a transmission timing 161 and a channel allocation time 151 to be used by the mobile station,
Transmission instruction message 1 on packet control channel 113
31 instructs the mobile station 101 on the packet channel, timing, and assigned time. The mobile station 101 transmits the packet as a divided block group according to this instruction. If the transmission of all the packet blocks cannot be completed within the allotted time 151, the base station sends a retransmission instruction message 136 to the mobile station. Channel 115
And transmission at the transmission time 166 and the channel allocation time 156.

On the other hand, as shown in FIG. 6, following the preamble (arrangement of specific signals) 611 for synchronization acquisition on the packet channel, the packet data blocks are transmitted by the number within the time 601 to which the channel is allocated. You.

One packet channel (114 or 115) is shared by a plurality of mobile stations, but information on the packet channel is scrambled by a different PN code for each mobile station when transmitted. Therefore, no information leakage or interference occurs between mobile stations sharing the same packet channel.

The base station determines the priority for each packet individually, and the base station takes this into account when assigning a packet channel to each mobile station for transmitting the packet. First, when a plurality of mobile stations have issued packet transmission requests at substantially the same time, but there is no available channel, the channel is allocated first to the mobile station that is to transmit a high priority packet. In FIG. 1, although the packet reservation messages 122 and 123 are issued almost simultaneously from the mobile stations 102 and 103, the priority of the packet to be transmitted by the mobile station 102 is the priority of the packet to be transmitted by the mobile station 103. If it is higher, the packet channel 114 is allocated to the mobile station 102 first, and the transmission of the mobile station 103 is started from the time 163 when the subsequent channel becomes empty. Also, the length of time for allocating channels to mobile stations is proportional to this priority. For example, if the priority of the packet of the mobile station 102 is P_A and the priority of the packet of the mobile station 103 is P_B, the ratio between the channel allocation time 152 and the allocation time 153 for each mobile station in FIG.
A: P_B (P_A and P_B have larger values as the priority is higher).

The details of the method of determining these priorities will be described later.

The same processing is performed when a packet is transmitted from the base station to the mobile station. An example is shown in FIG. The base station determines the priority of each of the packets arriving from the external data communication network, and the destination mobile station determines the allocation time and the allocation order of the packet channel for receiving the packet data based on the priority. The control channel indicates to the destination mobile station of the packet the channel, the reception timing, and the channel allocation time.

In FIG. 13, the base station receives reception instruction messages 1311, 131 on packet control channel 1301.
At 2, 1313, after notifying the times 1331, 1332, 1333 at which packet data is transmitted to each mobile station, the allocated time 1321, 1322, 1323 to each, and the packet channel 1302 or 1303 to be used, Packet data is being transmitted on the channel specified to the station.

As an application example, when a high priority is required for a packet or the like that requires immediacy, one mobile station is permitted to use a plurality of channels simultaneously in order to reduce the time required for transmitting the packet. Alternatively, the divided packets can be distributed to different channels and transmitted simultaneously.

In the example shown in FIG. 14, the base station returns a plurality of transmission instruction messages 1421 and 1422 in response to the packet reservation message 1411 from the mobile station, and instructs packet data transmission using the packet channel 1403 and the packet channel 1404 simultaneously. are doing.

As shown in FIG. 4, each packet is divided into blocks to which a packet data identifier and a sequence number are added, and transmitted. Therefore, one packet is divided into a plurality of channels on the transmitting side and transmitted. However, the receiving side can reconstruct the original packet.

As for the simultaneous use of a plurality of channels, in addition to the method of dividing one packet into a plurality of channels and distributing and transmitting them simultaneously as described above, data having different uses such as character data and image data for each channel may be used. Can be used simultaneously by one mobile station. However, it is necessary for the mobile terminal to have the ability to simultaneously receive two or more channels.

(7) Packet transmission / reception processing The operation of the base station and the mobile station in the packet transmission / reception processing will be described. After a packet data communication service connection is established between the base station and the mobile station by a call from the mobile station to the base station or by a mobile station call from the base station as shown in FIG. 9 or FIG. Packets are transmitted and received between the mobile station and the base station according to the procedures shown in FIGS.

FIG. 15 shows a processing procedure for transmitting a packet from a mobile station to a base station in the mobile communication system of the present invention. Each time the mobile station receives a packet from the connected portable information terminal and needs to transmit the packet (1501), the mobile station sends a packet reservation message including information such as the size of the packet to be transmitted and the priority desired by the sender. The base station is notified (1502), and the base station receives this (1511).

The base station determines the priority of each packet data using information extracted from these packet reservation messages from a plurality of mobile stations, and creates a packet channel use schedule in consideration of the priority ( 151
2). (The priority determination for each packet and the schedule creation process will be described later.) After the schedule creation, the base station uses the transmission instruction message to transmit the channel to be used by the mobile station, the transmission timing (transmission start time), and the time limit (transmission). (Time) to the mobile station (151).
3), each mobile station receives these instructions from the base station (1)
503). However, the mobile station that has not received the transmission instruction within a predetermined time transmits a packet reservation message again at random time intervals (1503, NO). The mobile station that has received the transmission instruction from the base station divides the packet into blocks, waits until the transmission start time specified by the transmission instruction message from the base station, and sets the specified transmission time in a timer (1504). Thereafter, the mobile station transmits the blocks as a packet data block group on the designated channel (1505).

The base station has a channel designated for each mobile station,
At the timing, a packet data block group is received (1514), and the packet is reconfigured according to the packet identifier and the sequence number included in the received block. The mobile station monitors the transmission time using the timer set in step 1504 (1506). If the transmission of all blocks is not completed within the specified time, the mobile station waits until the base station instructs the transmission channel and timing again. Waiting (1
507, NO), the remaining blocks are transmitted according to the instruction (1505). The base station receives all the blocks and, if there is a packet whose reconfiguration has been completed, transmits the packet to the data communication network (1515, 1516).
The base station also monitors the data reception start time and reception time,
Data may be received only during that time.

Next, FIG. 16 shows a processing procedure when transmitting a packet from the base station to the mobile station. However, the packet reception processing shown in FIG. 15 and the packet transmission processing shown in FIG. 16 operate independently and in parallel at the base station.

The base station having a packet to be transmitted to the mobile station, such as a new packet reaching the mobile station from the data communication network, creates a packet channel use schedule in consideration of the priority of each packet (1612). ),
After instructing each mobile station with a channel and timing (reception start time and reception time) at which packet data should be received by the reception instruction message (1613), the packet is divided into packet data blocks as transmission units (161).
4) Transmit these at the channel and timing instructed to the mobile station (1615). The mobile station (1601) receiving the reception instruction message follows the instruction and waits until the reception start time, and sets the reception time in the timer (160).
2). Thereafter, a packet data block is received from the base station on the designated channel and timing (1603),
The original packet is reconstructed according to the packet identifier and the sequence number included in each block. The packet which has received all the data blocks and completed the reconfiguration is sent to the portable information terminal (1606). The reception start time is monitored by the timer set in step 1602 (1604). The base station also monitors the data transmission start time and the transmission time, and is controlled to transmit data only during that time. The mobile station in which up to the last block has not been transmitted from the base station within the time specified by the reception instruction message waits again for a reception instruction message from the base station (1605, NO), and the same procedure (1601 to 1603) Is repeated to receive the remaining blocks from the base station.

The packet transmission / reception processing shown in FIGS. 15 and 16 is performed by the MPUs 715 and 815 of the base station and the mobile station.
In accordance with the instruction, the base station and other parts in the mobile station operate.

(8) Channel Use Schedule Creation Processing In the channel use schedule creation processing shown at 1512 in FIG. 15 and 1612 in FIG. 16, details of the schedule creation processing taking into account the priority of each packet will be described.

The packet data control unit of the base station performs a mobile station management table 714-1 shown in FIG. 17, a packet management table 714-2 shown in FIG. 18, a schedule management table 714-3 shown in FIG. 19, and traffic shown in FIG. The channel management table 714-4 is stored in the packet management information storage memory 71 of FIG.
4. Hold on top. The packet management table, the schedule management table, and the traffic management table are created for reception of the base station / transmission of the mobile station (up) and transmission of the base station / reception of the mobile station (down).

The mobile station management table 714-1 in FIG. 17 manages information on mobile stations connected to the packet data communication service with the base station. A mobile station that is connected to the base station for packet data communication service but has not transmitted or received packets for a while and has entered the dormant (pause) mode has its entry retained in this table.

The mobile station management table contains information on the priority agreement based on a prior contract between the packet data communication service user and the service provider, the connection time of the packet data service, and the connection between the mobile station and the base station since the connection. The number of occurrences of packets transmitted and received between them, the frequency of occurrence of packets since service connection, the amount of accumulated transmission / reception data, and the communication quality state between the mobile station and the base station are stored. These pieces of information for each mobile station are weighted in determining the priority, and are used as factors for determining the priority of packets transmitted and received between the mobile station and the base station.

The packet management table 714-2 shown in FIG. 18 manages, for each packet, information on a packet currently being transmitted or scheduled to be transmitted between the mobile station and the base station registered in the mobile station management table.

The packet management table contains, for each packet to be transmitted and received, its identifier, partner mobile station, reception time (the time when the packet reservation message was issued from the mobile station, or the time when the packet arrived at the base station from the data communication network). ), The size of the packet, the remaining size of the packet being transmitted, the communication speed, the priority requested by the transmitting side, whether or not the partner mobile station is currently waiting for a transmission / reception instruction, and if the waiting state, the waiting time is stored. Is done. Each of these elements is weighted in the priority determination for each element in the same manner as the information on the mobile station management table, and is used as a factor for determining the priority of the packet. The priority of each packet determined by the information on the mobile station management table and the packet management table is also stored in the packet management table.

The schedule management table 714-3 shown in FIG.
Manages information about packets that are currently being transmitted / received between the mobile station and the base station, or the scheduled time of transmission / reception and the channel to be used are determined, and the mobile station has already been notified of the packet transmission instruction message or packet reception instruction message. The schedule management table stores, for each packet, its identifier, the partner mobile station, the packet channel to be used, the transmission start time, the transmission time, the communication speed, and the remaining size after transmission.

The traffic channel management table 714-4 of FIG. 23 shows the upper limit of the number of available traffic channels, the number of currently used traffic channels, the number of currently used voice channels, the upper limit of the number of usable packet channels, It manages the number of currently used packet channels and the number of mobile stations currently connected to the packet data communication service and capable of transmitting and receiving packets according to the procedures shown in FIGS. Also, the correspondence between each traffic channel and the orthogonal code for generating the traffic channel, the current application of each traffic channel, and the packets transmitted / received to / from the mobile station that is using the channel or has already decided to use the channel. , The transmission / reception start time and the channel allocation time, and the time at which the channel can be allocated next.

FIG. 21 shows a schedule creation processing flow by the base station. When a packet data service connection is newly established with a mobile station having no entry in the mobile station management table 714-1 (2101), the base station registers the mobile station in the mobile station management table 714-1 shown in FIG. (210
2).

Next, it is checked whether or not a new packet to be transmitted to the mobile station has arrived from the external data communication network, and whether or not the mobile station has received a packet transmission request by a packet reservation message from the mobile station (2103). When a packet to start transmission / reception occurs in the transmission / reception packet management table 714-2, the packet is registered (2104).

Next, the presence or absence of a mobile station using the packet channel for the allocated time is checked from the schedule management table and the packet management table 714-2 (2105), and the mobile station completes packet transmission and reception within the allocated time. That is, if the transmission and reception up to the last block of the divided packet block have been completed, the entry of the packet is deleted from the packet management table (2108).
Further, the mobile station management table 714-1 updates the contents of the number of generated packets, the frequency of generated packets, and the accumulated transmission / reception amount of the mobile station.

If transmission / reception of all blocks is not completed within the allocation time and the next channel allocation is necessary, the information of the remaining data size and communication quality in the packet management table is updated for the packet (2107).

As described above, when the packet management table is updated due to the occurrence of a new packet or the end of use of the assigned time of the packet channel of any mobile station (2)
109), the priority of each packet is determined based on information on the mobile station management table and the packet management table, and is set in the packet management table. (A method of determining the priority will be described later.) Next, for a packet in a transmission / reception instruction waiting state on the packet management table, a channel use allocation time for each packet is determined according to the priority of the packet (2110). . The maximum length of the channel allocation time for each packet is limited to the length dynamically determined in proportion to (the number of channels available for packet communication / the number of base stations and mobile stations transmitting and receiving packets). Within the range, the priority ratio of each packet shall be followed. For example, if the current limit value of the above allocation time is T and the maximum value of the priority is P_M, the allocation time for the packet of the priority P_a is (P_a / P_M) × T, the allocation time for the packet of the priority P_b Is (P_b / P_M) × T. However, if transmission is completed within the allotted time in view of the remaining packet size, only the time required for transmission is allocated. Further, the base station refers to the traffic channel management table 714-4 in FIG. 24 and determines a channel to be allocated to the mobile station and its time. If the number of used channels is equal to or less than the limit number, a new channel is reserved and assigned to the packet (2113). If there is no available channel, the channels are allocated in order of priority and the channel that becomes available earlier is started (2112). When there are a plurality of packets having the same priority, the packets are assigned in the order of the reception time registered on the packet management table.

The channel assignment, transmission / reception start time, and channel assignment time for each packet determined as described above are stored in the schedule management table 714-3, and a transmission instruction message to each mobile station based on the contents of the schedule. Alternatively, a reception instruction message is created (21
14).

FIG. 22 shows an example of the schedule determination timing. In FIG. 22, it is assumed that the base station is transmitting packet data A on channel 2202 and packet data B on channel 2203 at time 2211. It is also assumed that packet data C is to be transmitted on channel 2201 from time 2212, and that this instruction has already been notified to the mobile station. When another packet D transmission request occurs at this time 2211, the allocation time 2224 is determined by comparing the priority of the remaining part of the packet data A, B, and C with the priority of the packet data D. At time 2211, the next channel becomes available at time 2213, and the transmission of the packet D starts from this time.
A schedule is created to start at 2, and the destination mobile station of packet D is notified. When the time further elapses and time 2213 is reached, the channel allocation time expires for packet A, but if there is still remaining data, the priority of the remaining portion of packet A and other packets The allocation time 2225 is determined by comparing the priorities of the remaining portions of B, C, and D, and the next free channel 2201 and time 2214 are notified to the destination mobile station of the packet A.

If there are a plurality of packets waiting for channel assignment, the channel is assigned to the one with the higher priority first.

(9) Priority Determination Method In the channel use schedule creation method described in the previous section, priority is used. Here are some ways to determine priorities.

Example of Priority Determination (A) First, an example of priority determination for performing a response according to the service quality request for each packet will be described. In this case, the base station determines the priority of the packet based on the packet data communication service user's request or the nature of each packet such as how much immediacy is required for the packet to be transmitted. Information such as the cumulative size of the packet transmitted at that priority is stored in the user information management database 7 shown in FIG.
13 and recorded there, and can be used as information for charging for each service user.

Example of Priority Determination (A-1) When Complying with Contract Conditions of Service User Priorities are determined in advance for each service user when subscribing to the packet data communication service, and packets transmitted and received by each mobile station are determined. The priority also follows this preset priority. The contract information of the service user in this case is registered in the user information management database 713 shown in FIG. 7, and the information obtained from this database by the base station is stored in the mobile station management table shown in FIG.
It is assumed that the priority can be specified in, for example, 1 to 8 stages.

Example of Priority Determination (A-2) In Case of Complying with Service User's Request A software application on a portable information terminal connected to the mobile station sets the priority desired by the sender in the header of the packet, Is read by the mobile station, and is set in the priority request field 415 of the packet reservation message 411 shown in FIG. 4 to notify the base station. Or,
The priority request information is read by the base station from the header portion of the packet arriving from the external data communication network at the base station, and is used as the priority when transmitting the packet to the mobile station.

It is assumed that the priority can be specified in, for example, 1 to 8 stages. Further, the request priorities 1 to 6 are set in a range that can be normally specified by the service user, and the priority 7 is used as a value for system maintenance, and the priority 8 is used as an emergency call.
Further, it is also possible to set an upper limit on the priority range that can be requested by the user based on the contract conditions of the above example (1-1).

As a means for a user who wants to transmit a packet on the system of the present invention to notify the mobile station or the base station of this priority, for example, in the case of transmitting an IP packet,
A specific field of the IP header can be used. In the IP protocol version 4 defined by RFC791, which is an Internet standard, as shown in FIG. 20, there is an 8-bit service type field in the header part of the packet, of which three bits are used to indicate a priority request. Can do things. Although this field is usually used on a wired IP network, the mobile station and the base station in the embodiment of the present invention also use this field for transmission on a wireless section between the mobile station and the base station. It is characterized by doing.

Example of Priority Determination (A-3) Case of Packet Type Rather than the packet sender directly specifying the packet priority as in the above determination example (A-2), the packet type is moved. It is also possible to determine the priority by making a determination in the station terminal or the base station device. In the IP version 4, the protocol field is present in the header portion of the IP packet shown in FIG. 20, and indicates the type of data stored in the data portion of the packet. This protocol type set in the IP header by the mobile station terminal or the base station device that wants to transmit the packet is used for determining the read priority.

It is assumed that the correspondence between the types of packets and their priorities is defined in advance. For example, IP
Among the packets, TCP packets that guarantee reliability,
The priority is set to 3, 2, 1 or the like in the order of the UDP packet, which is the connectionless communication, and the control information notification ICMP protocol packet.

[0111] On the data communication network, IP
In some cases, a datagram of TCP, for example, a TCP datagram is divided into a plurality of IP packets and transmitted, and the position on the original TCP datagram is set in the fragment offset field of the header part of each IP packet in FIG. Is set. IP that constitutes the original TCP datagram
When a packet is dropped, the entire TCP datagram is retransmitted, and the IP packet received so far is discarded. Therefore, a drop occurs in an IP packet located near the end of the original TCP datagram. , A lot of waste. In the base station and the mobile station according to the present invention, the IP
The fragment offset field of the header part of the packet is read, and I
By giving high priority to P packets, that is, those belonging near the end of the original TCP packet, it is possible to prevent the IP packet from being considered lost due to delay or the like and re-transmitting the entire TCP datagram, thereby preventing waste. It is.

Example of Priority Determination (A-4) When Determined According to Usage of Packet Data Communication Service User Service connection time since packet data communication service connection processing shown in FIGS. The transmission / reception amount is stored in the mobile station management table shown in FIG. This information is used to give higher priority to packets of packet data communication service users who have been using the service for a long time and packet data communication service users who have frequent packet traffic, and improve the service quality of each user. It can be differentiated.

Example of Priority Determination (B) In the example of priority determination (A) described above, an example of priority determination for service quality correspondence for each packet is shown. In order to improve the throughput, it is also possible for the base station to determine the priority of each packet data and to determine the channel use time of each mobile station according to the priority.
An example of the priority determination is shown below.

Example of Priority Determination (B-1) When priority is given to a packet near the completion of transmission The priority is determined using the size of the remaining untransmitted data of the packet being transmitted / received as a judgment factor.

As indicated by reference numeral 531 in FIG. 5, a sequence number is set for each transmission unit block in descending order, and this indicates the number of remaining blocks. By utilizing this, the remaining data size in the packet management table of FIG. 18 can be updated, and higher priority can be given to packet data having a small remaining size. Since the remaining size changes with time, this priority also changes dynamically. As a result, transmission / reception of small-sized packet data can be terminated early, and the number of mobile stations using the packet channel can be reduced quickly to increase the channel use efficiency.

Example of Priority Determination (B-2) When Priority is given to Good Communication Quality If the communication quality of the transmission path between the mobile station and the base station is poor, transmission data is lost between the two, and retransmission control is performed. Since the transmission / reception efficiency is reduced, the priority of the transmission / reception packet with the mobile station having low communication quality is lowered to wait for the recovery of the communication quality, and the communication with the mobile station having high communication quality is prioritized. Therefore, from the current packet data reception status,
The quality of communication between each mobile station and the base station is determined by Eb / No.
Based on (signal power / noise power density per bit) or S / N ratio (signal-to-noise power ratio), the base station communication quality measuring device 708 shown in FIG. This is stored in a table, and a higher priority is given to the mobile station having a good communication state. By assigning a time corresponding to this priority ratio to each packet data transmission, communication with mobile stations with a reliable communication state can be terminated quickly and the number of mobile stations using the packet channel can be reduced. Channels can be reduced quickly and channel utilization efficiency can be increased.

In the above example, the priority is determined by a single factor. However, the priority may be determined by combining these factors. The weight for determining the priority of the mobile station management table 714-1 and the packet management table 714-2 is used when determining the priority by combining a plurality of factors.

(10) Modification Each time a packet data block is transmitted, it is necessary to notify the channel and the allocated time by a transmission / reception instruction message. However, an embodiment in which the channel allocation time is fixed periodically so that overhead due to this processing does not occur is also possible. In this case, the base station informs the mobile station
The channel to be used for transmitting and receiving packets and the first use start time when transmitting and receiving the first packet data block, 1
Specify the allocation time in the cycle. The mobile station that has received the channel designation transmits and receives packet data from the second time to the completion of all block transmission / reception without a transmission / reception instruction message from the base station in accordance with a cycle determined for each channel.

In the example of packet transmission from a mobile station to a base station shown in FIG. 23, in response to a packet reservation message 2321 from mobile station 2301, the base station returns a transmission instruction message 2331, and time 23
61, it is instructed to transmit at a period 2351 and at a period allocation time 2341. Also, this mobile station 2301
Assuming that the priority of the packet of the mobile station 2303 is lower than that of the packet of the mobile station 2303, a shorter allocation time 2343 having the same cycle but shorter is designated for the mobile station 2303. on the other hand,
The packet of the mobile station 2302 has higher priority than the packet of the mobile station 2301, and the cycle 2 shorter than the cycle 2351 of the packet channel 2313 used by the mobile station 2301.
A packet channel 2314 having 352 is allocated. As described above, the cycle in which the mobile station uses the channel may be different for each channel, but the ratio of the time allocated to each mobile station in one cycle depends on the priority of the packet transmitted and received by the mobile station. The ratio of (the channel allocation time of the mobile station / period of the channel) for a packet having a higher number is made higher.

In the case of the second modification, the transmission timing is periodic, and the channel and its use allocation time are fixed every period. Therefore, even if one packet is transmitted and received several times, the transmission / reception instruction message is notified. Need only be performed once, which reduces the overhead associated with processing the packet control channel.

Also in this embodiment, the packet is divided into blocks as shown by reference numeral 511 in FIG. 5 and transmitted, and the completion of the packet transmission is notified by transmitting the block of sequence number 0.

As described above, the present invention is characterized by taking into account the use status of channels and the priority of individual packet data in creating a channel use schedule. Higher priority packets are assigned a packet channel for a longer period of time. The determination of the priority for each packet data has two purposes: to respond to the service quality requirement for each packet and to improve the packet throughput of the entire system. An embodiment of the method for determining the priority will be described below.

[0123]

As described above, according to the present invention, 1
In order to share a channel among multiple packet data communication service users, even in the case where the number of channels is conventionally insufficient and connection is refused, more packet data communication service users are allowed to connect. Services can be provided simultaneously. It is not necessary to repeatedly transmit a connection request until a channel becomes free unlike the related art, and the collision of reservation messages in the access channel and the overhead of connection request processing in the mobile station and the base station are reduced. If there is no room for the number of free voice communication channels, the number of shared mobile stations per packet data communication channel can be increased to secure a voice communication channel.

Also, in preparing a channel allocation schedule for each mobile station, scheduling is performed for each packet transmitted / received by the mobile station based on a priority in consideration of characteristics such as length, communication quality of a transmission path, and the like. The channel use efficiency is improved, and the packet transmission / reception throughput of the entire system is improved.

Further, the channel allocation scheduling is performed based on the contract conditions of the packet data communication service user at the time of service subscription, the desire at the time of packet transmission request, or the priority of the packet determined according to the use of each packet type. Therefore, it is possible to perform flexible service quality correspondence for each packet data communication service user and each packet type.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of channel use scheduling in packet transmission from a mobile station to a base station according to the present invention.

FIG. 2 is an explanatory diagram showing a configuration example of a mobile communication system according to the present invention.

FIG. 3 is an explanatory diagram showing a configuration of a wireless channel according to the present invention.

FIG. 4 is an explanatory diagram showing frame formats of various messages used in the present invention.

FIG. 5 is an explanatory diagram showing division of a packet into transmission unit blocks and a format according to the present invention;

FIG. 6 is an explanatory diagram showing a configuration of a packet channel according to the present invention.

FIG. 7 is a block diagram illustrating a functional configuration of a base station device according to the present invention.

FIG. 8 is a block diagram showing a functional configuration of a mobile station terminal according to the present invention.

FIG. 9 is an explanatory diagram showing a packet data communication service connection sequence according to a request from the mobile station side of the present invention.

FIG. 10 is an explanatory diagram showing a packet data communication service connection sequence by calling a mobile station from a base station according to the present invention.

FIG. 11 is an explanatory diagram showing a packet transmission sequence from a mobile station to a base station according to the present invention.

FIG. 12 is an explanatory diagram showing a packet transmission sequence from a base station to a mobile station according to the present invention.

FIG. 13 is an explanatory diagram of channel use scheduling in packet transmission from a base station to a mobile station according to the present invention.

FIG. 14 is an explanatory diagram showing channel scheduling when the mobile station of the present invention uses a plurality of packet channels simultaneously.

FIG. 15 is a flowchart showing a packet transmission procedure from a mobile station to a base station according to the present invention.

FIG. 16 is a flowchart showing a packet transmission procedure from a base station to a mobile station according to the present invention.

FIG. 17 is an explanatory diagram showing the configuration of a mobile station management table according to the present invention.

FIG. 18 is an explanatory diagram showing a configuration of a packet management table of the present invention.

FIG. 19 is an explanatory diagram showing a configuration of a schedule management table of the present invention.

FIG. 20 is an explanatory diagram showing a configuration of a header portion of an IP packet.

FIG. 21 is a flowchart showing a procedure for creating a packet transmission / reception schedule by the base station according to the present invention.

FIG. 22 is an explanatory diagram of channel scheduling according to the present invention.

FIG. 23 is an explanatory diagram showing channel scheduling of the present invention.

FIG. 24 is a diagram showing a configuration of a traffic channel management table of the present invention.

[Explanation of symbols]

101-103, 211-214, 801 and 2301-
2303: mobile station, 231 to 233: portable information terminal, 221 to 224, 701: base station, 241, 251, 261, 262 ... data communication network, 201, 202 ... cell, 271 to 273 ... information communication equipment, 301 ... Downlink CDMA channel, 311 uplink CDMA channel, 302 pilot channel, 303 synchronization channel, 304 paging channel, 113, 305, 1301, 1402, 2312 packet control channel, 306, 314 traffic channel, 312 access channel , 111-112, 313, 1401, 2311 ... packet reservation channel, 306 ... traffic channel, 114, 115, 1302, 1303, 1403, 14
04, 2201 to 2203, 2313, 2314 ... packet channels, 121 to 123, 411, 1101, 1411, 232
1-2323: Packet reservation message, 131-136, 421, 1102, 1104, 14
21, 1422, 2331 to 2333: Packet transmission instruction message.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04L 12/28 H04L 11/20 102E (72) Inventor Yoshiyuki Otsu 216 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa-pref. Hitachi, Ltd. Information and Communication Division (72) Inventor Atsushi Tejima 216 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture F-term in Hitachi, Ltd. Information and Communication Division 5K022 EE01 EE14 FF02 5K030 GA08 GA13 HA02 HA08 HB14 HC09 JA05 JL01 KA13 LA03 LB02 LE05 LE06 5K033 AA09 CA11 CA17 CB01 CB17 CC01 DA01 DA06 DA19 5K067 AA11 BB21 CC04 CC08 CC10 DD23 DD34 DD51 EE02 EE10 EE71 GG06 JJ02 JJ17 JJ22

Claims (13)

[Claims] 1. A packet data communication method in a CDMA mobile communication system, comprising: dividing a traffic channel by time; assigning the time-divided traffic channel to a plurality of mobile stations being connected; And transmitting and receiving packet data between the base station and the mobile station within the allocated time. 2. The packet data communication method according to claim 1, wherein the base station instructs a partner mobile station on a traffic channel to be used and an allocated time for each packet data to be transmitted and received. Communication method. 3. The packet data communication method according to claim 2, wherein the packet data is divided into a plurality of blocks, and if transmission and reception of all blocks cannot be completed within the allocated time, the base station transmits the remaining blocks. A packet data communication method characterized by instructing a partner mobile station again on a traffic channel to be used and an allocated time for transmission and reception. 4. The packet data communication method according to claim 2, wherein the base station determines a priority for each packet data to be transmitted / received, and a traffic channel for a higher priority packet data is transmitted earlier and longer. And a packet data communication method. 5. The packet data communication method according to claim 4, wherein said priority is determined by at least one of a size and a type of packet data to be transmitted. 6. The packet data communication method according to claim 4, wherein said priority is determined by a partner mobile station which performs packet transmission / reception. 7. The packet data communication method according to claim 4, wherein said priority is determined by communication quality of a transmission path. 8. The packet data communication method according to claim 4, wherein said priority is determined by a transmission completion ratio of packet data. 9. The packet data communication method according to claim 2, wherein the packet data is divided into a plurality of blocks, and when all the blocks cannot be transmitted and received within the allocated time, the packet data is used at the time of the first block transfer. A packet data communication method characterized by using a traffic channel to transmit / receive the remaining blocks at a period specified for each transmission and a period specified for each channel, which is designated at the time of the first block transfer. 10. A CDMA mobile communication system, comprising: a base station connectable to a packet network; and a mobile station connectable to an information processing apparatus. Means for allocating the time-divided traffic channel to the mobile station, means for transmitting and receiving packet data to and from the mobile station within the allocated time using the allocated traffic channel, and for transmitting and receiving packet data to and from the packet network. Means for performing format conversion of packet data to be transmitted to and received from the mobile station and packet data to be transmitted and received to and from the mobile station, wherein the mobile station uses the traffic channel allocated by the base station, Means for transmitting and receiving packet data to and from a station; means for transmitting and receiving data to and from the information processing apparatus; CDMA mobile communication system comprising means for performing format conversion of the data to be transmitted and received packet data and an information processing apparatus for transmitting and receiving and the earth station. 11. A packet data communication program for a mobile station of a CDMA mobile communication system, wherein the program receives a notification of a traffic channel and an allocation time from a base station when transmitting and receiving packet data, and is assigned by the base station. Using traffic channels,
Includes instructions for performing packet data transmission / reception with the base station within the allotted time, performing format conversion of packet data transmitted / received with the base station and data transmitted / received with the information processing device, and executing data transmission / reception with the information processing device. A packet data communication program characterized by the above-mentioned. 12. A packet data communication program for a base station of a CDMA mobile communication system, the program storing a packet data transmission / reception schedule with a connected base station, and setting a traffic channel according to the stored packet data transmission / reception schedule. Time-divided, allocates the time-divided traffic channel to the connected mobile station, notifies the mobile station, and uses the allocated traffic channel to perform packet data transmission / reception with the mobile station within the allocated time, A packet data communication program comprising instructions for performing format conversion of packet data transmitted / received to / from a mobile station and packet data transmitted / received to / from a packet network, and executing a step of transmitting / receiving packet data to / from a packet network. 13. A storage medium storing the packet data communication program according to claim 11.