Packet communication system

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to a packet communication system, and more particularly to a packet communication system that alleviates the traffic of packet communication.

【0002】

[Conventional technology]

Conventionally, in a packet communication system using a PDC (Personal Digital Cellular System) digital mobile phone specified in RCR STD-27, multiple mobile devices perform data communication on one wireless line.

【0003】

As shown in FIG. 8, the radio base station 71 delivers the packet data of the outstanding number specified by the LAPDM protocol of layer 2 (data link layer), for example, the outstanding number = 15, to the mobile station 2 without confirmation of delivery. Sending to -1 to 2-8. At this time, when the mobile station 2-9 transmits the packet data A to the radio base station 71, the radio base station 71 must receive the packet data A and transmit the delivery confirmation to the mobile station 2-9. .. However, since the radio base station 71 transmits 15 packet data to each of the mobile stations 2-1 to 2-8, the layer 1 of the radio base station 71 transmits a maximum of 120 packet data. As a result, confirmation of delivery to mobile stations 2-9 will be delayed. Mobile station 2-9 cannot confirm the delivery of the transmitted data and retransmits the data (transmission of inquiry in the LAPDM protocol).

【0004】

[Problems to be Solved by the Invention]

In such a conventional packet communication system, if data retransmission continues, it is determined that a communication error occurs, and the link is reconfigured and the data is retransmitted. In such a state, if the number of mobile devices communicating at the same time increases, data retransmissions frequently occur in multiple mobile devices due to waiting for a response, traffic increases extremely, and the transmission speed becomes extremely slow and stable. It had a problem that packet communication could not be performed.

【0005】

[Problems to be Solved by the Invention]

An object of the present invention is to solve the conventional problems and to provide a packet communication system capable of alleviating traffic and extremely stable packet communication.

【0006】

[Means for solving problems]

The packet communication system of the present invention is a packet communication system having a plurality of packet communication devices for communicating packets, wherein the packet communication device measures a traffic measurement means for measuring the average traffic of the packets to be communicated, and the average traffic and the number of outstandings. A storage means for storing a correlation table showing the correlation with and the outstanding number determining means for determining the outstanding number from the measured average traffic with reference to the correlation table, and the determined outstanding number. It is characterized by having an outstanding number notifying means for notifying the other packet communication device of the packet, and a packet transmitting means for transmitting the packet according to the determined outstanding number.

【0007】

Further, the packet communication system of the present invention is characterized in that the correlation table is a table showing a relationship in which the number of outstandings decreases as the average traffic increases.

【0008】

Further, the packet communication system of the present invention is a packet communication system in which a radio base station and a plurality of mobile devices communicate packets in the same radio frequency band, wherein the radio base station manages a monitoring cycle and a timer means. The packet data communication amount of each of the mobile devices is acquired between the outstanding number table storage means for storing the outstanding number table indicating the outstanding number of each of the mobile devices for each mobile device and the monitoring cycle. Then, the total amount of packet data communication is calculated by summing the total amount of packet data communication over all the mobile devices belonging to the same radio frequency band, and the total amount of packet data communication is divided by the monitoring cycle to obtain the average traffic. With reference to the average traffic measuring means and the correlation table for each monitoring cycle, the number of outstandings is determined from the average traffic, and the determined number of outstandings is used for all the mobile devices belonging to the same radio frequency band. It is characterized by having a traffic control means for storing the determined outstanding number in the outstanding number table.

【0009】

Further, in the packet communication system of the present invention, the radio base station has a packet transmission means for transmitting a packet to all the mobile devices belonging to the same radio frequency band according to the outstanding number determined by the traffic control means. It is characterized by that.

【0010】

Further, in the packet communication system of the present invention, the radio base station stores a mobile device usage frequency table showing a mobile device usage frequency, which is a frequency used by each of the mobile devices, for each mobile device. The unit and the mobile device receive a registration request requesting the start of communication, the mobile device used frequency of the mobile device is extracted from the registration request, and the extracted mobile device used frequency is used as the mobile device used frequency table. By receiving the registration request and searching the mobile device usage frequency table with the mobile device use frequency registration means registered in, other mobile devices communicate in the radio frequency band including the mobile device use frequency extracted. If the other mobile device is communicating in the radio frequency band, the outstanding number of the other mobile device is obtained from the outstanding number table, and the obtained outstanding number is requested to be registered. It is characterized by having an outstanding number notification registration means for notifying the mobile device and storing the obtained outstanding number in the outstanding number table.

【0011】

Further, in the packet communication system of the present invention, when the outstanding number notification registration means does not communicate in the radio frequency band, the outstanding number is set to the maximum value and set to the maximum value. It is characterized in that the number of outstandings is notified to the mobile device requested to be registered, and the number of outstandings set to the maximum value is stored in the number of outstandings table.

【0012】

Further, the packet communication system of the present invention is characterized in that the packet communication system uses the protocol specified by RCR STD-27.

【0013】

BEST MODE FOR CARRYING OUT THE INVENTION

Next, an embodiment of the present invention will be described in detail with reference to the drawings.

【0014】

FIG. 1 is a block diagram of a packet communication system according to an embodiment of the present invention, FIG. 2 is a block diagram of a traffic management device for a radio base station according to the present invention, and FIG. 3 is a table configuration according to the present invention. In the figure, FIG. 3 (a) is an outstanding number table configuration diagram, FIG. 3 (b) is an average traffic-outstanding number correlation table configuration diagram, and FIG. 3 (c) is a mobile device frequency table configuration. In the figure, FIG. 4 is an explanatory diagram of the outstanding number determination operation at the time of packet communication registration, FIG. 5 is a flowchart of the outstanding number determination operation at the time of packet communication registration, and FIG. 6 is an outstanding at the time of packet communication. In the explanatory diagram of the number determination operation, FIG. 7 is a flowchart of an outstanding number determination operation during packet communication, and FIG. 8 is an operation explanatory diagram of a conventional packet communication system.

【0015】

With reference to FIG. 1, the packet communication system 500 according to the embodiment of the present invention has a radio base station 1 and a plurality of mobile devices 2-1, 2-2, ..., And has an RCR. Packet communication is performed on a wireless channel using the protocol specified in STD-27 (Specifications for Personal Digital Cellular Systems of Research & Development Center for Radio Systems).

【0016】

The radio base station 1 includes a layer 3 control device 100, a layer 2 control device 200 that controls layer 2, and a layer 1 control device 300 that controls layer 1.

【0017】

The layer 3 control device 100 includes a traffic management device 10, a call control processing unit 20 that controls call connection and disconnection, a movement management processing unit 30 that manages the mobility of a mobile device, and a radio that manages radio resources. It has a management processing unit 40, a shared ride control unit 50 that apparently converts each signal from the call control processing unit 20, the mobile management processing unit 30, and the wireless management processing unit 40 into one signal and transmits and receives it to and from the layer 2 control device 200. I will.

【0018】

With reference to FIG. 2, the traffic management device 10 includes an input device 11, an output device 14, a data processing device 12, a timer 15, and a storage device 16.

【0019】

The input device 11 receives data related to the mobile device from the call control processing unit 20, the movement management processing unit 30, and the wireless management processing unit 40 of the layer 3 control device 100, and inputs the data to the data processing device 12.

【0020】

The data processing device 12 stores the input data in the storage device 16, measures the average traffic of the mobile device based on the data, determines the number of outstandings from the average traffic, and calls and controls the number of outstandings. Notify the processing unit 20. Here, the average traffic is obtained by summing up the data communication volume of the mobile devices during the monitoring cycle T over all the mobile devices belonging to the same frequency band to obtain the total data communication volume, and the total data communication volume is calculated by the monitoring cycle T. It is the divided value. Here, the outstanding number is a system parameter of the layer 2 LAPDM protocol according to the RCR STD-27 regulation, and when the radio base station transmits an information frame (I frame) to the mobile device, the delivery confirmation is obtained. The maximum number of I-frames that can be transmitted continuously without.

【0021】

The storage device 16 includes a traffic information storage unit 17 and a mobile information storage unit 18.

【0022】

The traffic information storage unit 17 stores the outstanding number table 17-1 and the average traffic / outstanding number correlation table 17-2.

【0023】

As shown in FIG. 3A, the outstanding number table 17-1 is a table showing the value of the outstanding number k for each mobile device.

【0024】

As shown in Fig. 3 (b), the mean traffic / outstanding number correlation table 17-2 shows the relationship between the average traffic and the outstanding number k, and the relationship in which the outstanding traffic k decreases as the average traffic increases. It is a table showing.

【0025】

The mobile device information storage unit 18 stores the mobile device operating frequency table 18-1.

【0026】

As shown in Fig. 3 (c), the mobile device operating frequency table 18-1 is a table showing the frequency used by each mobile device in communication, that is, the mobile device used frequency and its frequency band for each mobile device. ..

【0027】

The output device 14 outputs the processing result of the data processing device 12 to the call control processing unit 20, the movement management processing unit 30, and the wireless management processing unit 40 of the layer 3 control device.

【0028】

The timer 15 manages the monitoring cycle T for measuring the average traffic.

【0029】

The layer 2 control device 200 controls data transmission / reception for each mobile device.

【0030】

The layer 1 control device 300 controls data transmission / reception for each wireless channel.

【0031】

Next, the operation of the embodiment of the present invention will be described in detail with reference to the drawings.

【0032】

When the mobile device newly starts communication, the packet communication registration operation of the radio base station 1 will be described mainly with reference to FIGS. 4 and 5, with reference to FIGS. 1 to 3.

【0033】

With reference to FIG. 1, when the mobile device 2-i having the telephone number 1000 transmits a registration request for starting a new communication to the radio base station 1, the mobile management processing unit 30 of the layer 3 control device 100 moves. Mobile device 2-i mobile device frequency f_i Acquires mobile device information including the above, and transmits this mobile device information to the traffic management device 10.

【0034】

With reference to FIGS. 4 and 5, the data processing device 12 of the traffic management device 10 uses the mobile device operating frequency f from the mobile management processing unit 30 via the input device 11._i The mobile device information including the above is received (step S1), and the mobile device information is stored in the mobile device information storage unit 18. Here, the frequency used by the mobile device f_i Is stored in the mobile device operating frequency table 18-1 (step S2).

【0035】

Further, the data processing device 12 refers to the mobile device operating frequency table 18-1 and refers to the mobile device operating frequency f._iFrequency band B including_iThen, check if other mobile devices other than mobile device 2-i are communicating (step S3). As a result of investigation, frequency band B_i When other mobile devices other than the mobile device 2-i are communicating with each other, the data processing device 12 starts with the frequency band B from the frequency table 18-1 used by the mobile device._i Obtain the phone number of the other mobile device communicating with, here the phone number 2000 of mobile device 2-1 (step S4). Next, the data processing device 12 refers to the outstanding number table 17-1 of FIG. 3 (a) and obtains the value of the outstanding number k for the mobile device of the obtained telephone number (step S5). Here, the value of the outstanding number k for the telephone number 2000 is obtained. Next, the data processing device 12 notifies the call control processing unit 20 of the obtained value of the outstanding number k (step S6).

【0036】

When the call control processing unit 20 sets a data link with the mobile device 2-i that newly starts communication, the call control processing unit 20 notifies the mobile device 2-i of the obtained value of the outstanding number k (step S7).

【0037】

On the other hand, in step S3, frequency band B_i When the other mobile device is not communicating in, the data processing device 12 determines the outstanding number k to the maximum allowable value, for example, k = 15 (step S8), and proceeds to step S6.

【0038】

As described above, the mobile device that newly starts communication is given a value of the outstanding number k, and packet communication with the radio base station 1 is started by this value.

【0039】

Next, the radio base station 1 and the plurality of mobile devices are in frequency band B._i The operation of packet communication in FIG. 6 will be described mainly with reference to FIGS. 6 and 7, with reference to FIGS. 1 to 3.

【0040】

With reference to FIGS. 6 and 7, the data processing device 12 of the traffic management device 10 continuously acquires the data communication volume of each mobile device from the call control processing unit 20 via the input device 11 (step S10). ).

【0041】

Monitoring time t with monitoring cycle T managed by timer 15_i (Step S11), the data processing device 12 sums the data communication volume of each mobile device acquired during the monitoring cycle T over all the mobile devices belonging to the same frequency band to obtain the total data communication volume (step S11). Step S12). Next, the data processing device 12 divides the obtained total amount of data communication by the monitoring cycle T to obtain the average traffic (step S13). Next, the data processing device 12 refers to the average traffic-outstanding number correlation table 17-2 to determine the value of the outstanding number k with respect to the obtained average traffic (step S14). Next, the data processing device 12 stores the determined value of the outstanding number k in the outstanding number table 17-1 (step S15). At this time, the same value of the outstanding number k is stored for all the mobile devices belonging to the same frequency band. Further, the data processing device 12 notifies the call control processing unit 20 of the determined value of the outstanding number k (step S16), and the call control processing unit 20 notifies the call control processing unit 20 of the notified value of the outstanding number k. Notify all mobile devices belonging to the same frequency band (step S17).

【0042】

The radio base station 1 transmits a packet to the mobile device with a value of this outstanding number k.

【0043】

The traffic management device 10 repeats the above operations from step S10 to step S17 in the monitoring cycle T. Further, the traffic management device 10 executes the operations from step S10 to step S17 for each frequency band.

【0044】

By the above operation, the traffic management device 10 reduces the number of outstandings as the average traffic increases, and the radio base station 1 and the plurality of mobile devices 2-1, 2-2, ... are stabilized. Packet communication is possible.

【0045】

In the above, the packet communication system composed of the wireless base station and the mobile device to which the present invention is applied has been described, but the present invention has a packet communication system having a plurality of other wireless communication devices or a packet having a plurality of wired communication devices. Naturally, it can be applied to communication systems.

【0046】

[Effect of the invention]

As described above, since the present invention recognizes the change in the average traffic and changes the outstanding number, the amount of packet data that can be communicated at one time can be adjusted, and an extremely stable packet that is less likely to cause a communication error. Communication becomes possible.

[Simple explanation of drawings]

[Figure 1]

It is a block diagram of the packet communication system which is an embodiment of this invention.

[Figure 2]

It is a block diagram of the traffic management device of the radio base station by this invention.

[Fig. 3]

It is a table block diagram by this invention.

[Fig. 4]

It is explanatory drawing of the outstanding number determination operation at the time of packet communication registration.

[Fig. 5]

It is a flowchart of the outstanding number determination operation at the time of packet communication registration.

[Fig. 6]

It is explanatory drawing of the outstanding number determination operation at the time of packet communication.

[Fig. 7]

It is a flowchart of the outstanding number determination operation at the time of packet communication.

[Fig. 8]

It is operation explanatory drawing of the conventional packet communication system.

[Explanation of symbols]

500 packet communication system 1 Radio base station 2 mobile 100 Layer 3 controller 10 Traffic management device 11 Input device 14 Output device 12 Data processing device 15 timer 16 Storage device 17 Traffic Information Storage Department 17-1 Outstanding number table 17-2 Average Traffic Outstanding Number Correlation Table 18 Mobile information storage unit 18-1 Frequency table used by mobile devices 20 Call control processing unit 30 Movement management processing department 40 Wireless management processing department 50 Carpool control unit 200 Layer 2 controller 300 Layer 1 controller