JP2003319459A - Radio data transmission system, method for controlling its upch function channel and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio data transmission system which efficiently transmits data by efficiently selecting UPCH function channel for conducting a packet communication. <P>SOLUTION: The radio data transmission system comprises: a mobile unit 10; a radio base station 20 for recording number-of-moving-units information having UPCH function channel using the mobile unit 10 and identification information of the mobile unit; and a number-of-moving stations managing unit 30 for transmitting the number-of-mobile units information using the UPCH function channel of each UPCH function channel as control information to the radio base station 20 for controlling the channel to be controlled, by acquiring the number-of-mobile units information from the station 20 and detecting more UPCH function channel than a predetermined threshold from the number of the mobile units to be used. The base station 20 transmits the control information to the mobile unit 10 using the channel to be controlled. The mobile unit 10 using the channel to be controlled selects the UPCH function channel of smaller number of the using mobile units from the control information and communicates the data. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless data transmission system, a UPCH function channel control method and program therefor, and more particularly to packet communication in a digital mobile phone (hereinafter referred to as a mobile device) of a digital mobile communication system. A wireless data transmission system that enables efficient data transmission by efficiently selecting an UPCH function channel to be used, and its UP
The present invention relates to a CH function channel control method and program.

[0002]

2. Description of the Related Art In a digital mobile communication system, a wireless section interface (air interface) between a mobile unit and a radio base station is unified, and a signal system for a roaming function across networks of mobile communication carriers is provided. Unity is essential. In Japan, the Association of Radio Industries and Businesses (ARIB: Association of
Radio Industrial and Busi
(formerly the Radio System Development Center (R)
CR: Research & Development
Center for Radio system
s)), an air interface standard has been established under the name of RCR-STD-27 "Digital Car Telephone System Standard".

This digital mobile communication system has a PDC (Personal Digital Ce
It is called the "llullar" method and realizes high frequency efficiency and an ultra-small portable device (mobile device). In packet communication in the PDC system, a plurality of UPCHs (User Pas) are used.
ccket Channel: user packet channel)
Regarding a physical channel for packet communication having a function channel, it is specified that high-speed transmission using a plurality of UPCH function channels and low-speed transmission using a single UPCH function channel can be performed. Further, the same UPCH function channel is used by a plurality of mobile devices in synchronization.

[0004]

However, in the packet communication by the above-mentioned PDC type mobile device, one UPCH function channel used for transmitting and receiving data is first selected, and then the selected UPCH function channel is used. It is designed to carry out packet communication, and therefore UP
It is also possible that a plurality of mobile stations using low-speed transmission may select the same UPCH function channel when selecting the CH function channel, and the data transmission efficiency deteriorates due to channel collision during data transmission. In some cases,

If a plurality of mobile stations simultaneously select one UPCH functional channel, one mobile station will select the UPC functional channel.
Although packet communication is performed using the H function channel, other mobile devices cannot use the UPCH function channel at the same time, resulting in waiting for data transmission and the like. This state is shown in FIG.

In FIG. 7, a mobile station 71 and a mobile station 72 are present in the same cell of the mobile communication system, and the mobile station 72 is transmitting data using one UPCH function channel 75. I shall. The data transmitted by the mobile device 72 is the data 73, and the data 73 is transmitted using the UPCH function channel 55 from the time T0 to the time T2.

Then, at time T1 (between time T0 and T2), it is assumed that transmission data is generated in the mobile station 71, and the mobile station 72 is used as a UPCH function channel for transmission.
Shows the case where the same channel as the UPCH function channel 75 in use is selected. In this case, the mobile device 71 waits for transmission until time T2 when the data transmission of the mobile device 72 ends, and after the time T2, the data 74 to be transmitted by the mobile device 71 uses the UPCH function channel 75. Then it will be sent. From time T0 to time T2, the mobile device 71 is also unable to receive data.

As described with reference to FIG. 7, if the data transmission from the mobile device is delayed, the data transmission is delayed particularly when trying to transmit and receive a large amount of data. The communication application software higher than the data link layer (Layer 2 (second layer) of the OSI reference model) implemented by the mobile device causes a problem such as an error.

The present invention has been made in view of the above circumstances, and in packet communication in a mobile device of a digital mobile communication system, efficient data selection is achieved by efficiently selecting an UPCH function channel for packet communication. Wireless data transmission system that enables transmission, U
It is an object to provide a PCH function channel control method and program.

[0010]

In order to achieve the above object, the present invention as set forth in claim 1, is a mobile station for performing data communication using the UPCH function channel, and an UP used by the mobile station.
A radio base station that records mobile device number information including a CH functional channel and identification information of the mobile device, and mobile device number information is acquired from the radio base station, and the number of mobile devices to be used is greater than a predetermined threshold value. A mobile station number management device that detects a UPCH function channel as a control target channel and transmits, as control information, the number of mobile units using the UPCH function channel for each UPCH function channel to a radio base station that controls the control target channel. And the radio base station transmits the control information to the mobile station using the control target channel, and the mobile station using the control target channel uses the UPCH function channel with a small number of mobile stations to be used from the control information. The feature is that data communication is performed by selecting.

According to a second aspect of the present invention, in the first aspect of the present invention, the mobile station number management device uses the judgment value indicating how much the mobile stations using the control target channel are dispersed as the control information to the radio base station. A mobile station that transmits to a station and uses a controlled channel selects a UPCH functional channel that uses a small number of mobile stations based on control information, generates a random number, and compares the random number with the judgment value to determine the UPCH selected. It is characterized by determining whether or not to shift to the functional channel.

The invention according to claim 3 is the invention according to claim 1 or 2.
In the invention described above, the mobile device that uses the control target channel is a UPC that uses a small number of mobile devices according to control information.
When the H function channel is selected, it is characterized by detecting whether or not the reception level of the UPCH function channel is a reception level at which data communication is possible and determining whether or not to shift to the selected UPCH function channel.

According to a fourth aspect of the present invention, a mobile station number management device that manages the number of mobile stations that use the UPCH function channel for each UPCH function channel, and a mobile station that performs data communication using the UPCH function channel. And a UPCH functional channel used by the mobile device and a radio base station that records mobile device number information consisting of identification information of the mobile device. In the number management device, a detection step of acquiring mobile station number information from a radio base station and detecting a UPCH functional channel in which the number of mobile stations to be used is larger than a predetermined threshold as a control target channel, and a radio for controlling the control target channel UPC for each UPCH functional channel to the base station
A first control information transmitting step of transmitting the number-of-mobile-units information using the H function channel as control information, and the wireless base station receiving the control information, controls the mobile device using the control target channel. And a second control information transmitting step for transmitting the UPCH function channel, the mobile station having received the control information selects a UPCH functional channel having a smaller number of mobile stations to be used from the control information.
And a data communication step of performing data communication using the CH function channel.

According to a fifth aspect of the present invention, in the invention according to the fourth aspect, when a mobile station receiving control information selects a UPCH functional channel that uses a small number of mobile stations according to the control information, the UPCH functional channel of the UPCH functional channel is selected. The method is characterized by including a first determination step of detecting whether or not the reception level is a reception level at which data communication is possible and determining whether or not to shift to the selected UPCH functional channel.

The invention according to claim 6 is the invention according to claim 4 or 5.
In the invention described, in the mobile station number management device, a judgment value indicating how much the mobile devices that use the control target channel are distributed is transmitted to the radio base station as control information,
In the mobile device that has received the control information, the UPCH function channel that uses a smaller number of mobile devices is selected according to the control information, a random number is generated, and the selected UPCH function channel is compared by comparing the random number and the judgment value. It is characterized by having a second determination step of determining whether or not.

[0016] According to a seventh aspect of the present invention, a mobile station number management device that manages the number of mobile stations that use the UPCH function channel for each UPCH function channel and a mobile station that performs data communication using the UPCH function channel. And a UPCH function channel control program in a wireless data transmission system including a UPCH function channel used by the mobile device and a wireless base station that records mobile device number information including identification information of the mobile device. In the number management device, a detection process of acquiring mobile station number information from a radio base station and detecting a UPCH functional channel in which the number of mobile stations to be used is larger than a predetermined threshold as a control target channel, and a radio for controlling the control target channel In the base station, for each UPCH functional channel,
A radio base station that has executed the first control information transmission process of transmitting the number-of-mobile-units information using the UPCH function channel as control information, and received the control information, transmits the control information to the mobile units that use the control target channel. In the mobile device that has executed the second control information transmission process for transmitting the control information and has received the control information, the UP that uses a smaller number of mobile devices from the control information.
It is characterized in that UPCH function channel selection processing for selecting a CH function channel and data communication processing for performing data communication using the UPCH function channel are executed.

According to an eighth aspect of the present invention, in the invention according to the seventh aspect, when a mobile station which receives control information selects a UPCH functional channel that uses a small number of mobile stations according to the control information, the UPCH functional channel of the UPCH functional channel is selected. The first determination process is performed to detect whether the reception level is a reception level at which data communication is possible and determine whether to shift to the selected UPCH functional channel.

The invention according to claim 9 is the invention according to claim 7 or 8.
In the invention described, in the mobile station number management device, a judgment value indicating how much the mobile devices that use the control target channel are distributed is transmitted to the radio base station as control information,
In the mobile device that has received the control information, the UPCH function channel that uses a smaller number of mobile devices is selected according to the control information, a random number is generated, and the selected UPCH function channel is compared by comparing the random number with the judgment value. A second determination process for determining whether or not to perform is performed.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of a wireless data transmission system, a UPCH function channel control method and a program thereof of the present invention will be described in detail with reference to the accompanying drawings. 1 to 6, there are shown embodiments of a wireless data transmission system, a UPCH function channel control method and a program thereof according to the present invention.

First, the configuration of this embodiment will be described with reference to FIG. As shown in FIG.
Mobile device 10 compliant with DC system, and mobile device 10 and UP
The radio base station 20 performs packet communication using the CH function channel, and the mobile station number management device 30 that manages the usage status of the mobile device for each UPCH function channel.

As shown in FIG. 2, the mobile device 10 includes an input device 11, a data processing device 12, a storage device 13, and
An output device 14 and a random number generator 15 are provided.

The input device 11 inputs the control information transmitted from the radio base station 20 and transfers it to the data processing device 12.

The data processing device 12 saves the input control information in the storage device 13 and determines whether the UPCH function channel currently selected for packet communication based on this control information is appropriate for the shift to another UPCH function channel. To determine. The determination is made based on whether or not the following conditions are satisfied. 1) UPC that uses fewer mobile stations than the currently used UPCH function channel
There are other H functional channels. 2) UP detected in 1
The reception level of the CH function channel satisfies the reception level sufficient for packet communication. In addition, the number of mobile stations using the UPCH functional channel for each UPCH functional channel is notified from the radio base station 20 as control information.

The random number generator 15 is a data processor 12
A random number is generated when it is determined that a shift to another UPCH functional channel is made by. This random number is sent to the data processing device 12 and is used to determine whether to actually perform the UPCH functional channel transition operation. This is to prevent all the mobile stations that use the UPCH functional channel for which the distribution instruction has been issued by the mobile station number management device 30 from shifting to another UPCH functional channel.

Next, details of the mobile station number management device 3 will be described with reference to FIG. FIG. 3 shows the configuration of the mobile station number management device 30.

As shown in FIG. 3, the mobile station number management device 30 includes a data processing device 32 for controlling the operation of the mobile station number management device 30 and an input device 3 connected to the data processing device 32.
1, a storage device 33, an output device 34, and a timer 35.

The input device 31 acquires, from the radio base station 20, information on the number of mobile units using the UPCH function channel for each UPCH function channel controlled by the radio base station 20, and sends it to the data processing device 32.

The data processing device 32 stores the mobile device number information input from the input device 31 in the storage device 33, and it is better to distribute the mobile devices 10 based on the acquired mobile device number information. To judge. When there is an UPCH functional channel for which it has been determined that the distribution of the mobile devices 10 is necessary, control information including information on the number of mobile devices that use the UPCH functional channel and a determination value that determines how much dispersion is expected. Is output to the output device 34.

The output device 34 transmits the control information output from the data processing device 32 to the radio base station 20 which controls the UPCH functional channel for which the distribution instruction has been issued.

Since the timer 35 performs the determination process in the data processing device 32 at regular intervals, it measures time.

The radio base station 20 includes a mobile station number management device 30.
When there is a request for acquisition of the number of mobile units using the UPCH function channel to be controlled, this number of mobile units is transmitted to the mobile station number management device 30. Also, the mobile station number management device 3
When the control information is transmitted from 0, the transmitted control information is transferred to the UPC for which the distribution instruction is issued by the control information.
It is delivered to the mobile device 10 as a broadcast signal from the H function channel.

In the present embodiment having the above-mentioned configuration, the number of mobile stations currently in communication is monitored by the mobile station number management device 30,
By notifying the mobile stations of the UPCH functional channels in which the mobile stations are concentrated, including information on the surrounding area, the purpose of the mobile station is to efficiently perform data transmission using the UPCH functional channels that are considered optimal. And

Next, an operation procedure of the mobile station number management device 30 will be described with reference to FIG. First, the mobile station number management device 30 (step S1 /
YES), the mobile station number information is acquired from the radio base station 20 in the area controlled by the mobile station number management device 30 (step S2). In the radio base station 20, the information of the UPCH function channel selected by the mobile station, which is used for packet communication, is recorded together with the identification information of the mobile station.
The radio base station 20 notifies the mobile station number management device 30 of the mobile station identification information and the UPCH function channel information used by the mobile station as the mobile station number information.

Next, the mobile station number management apparatus 30 determines that the number of mobile stations used is larger than those of other channels based on the mobile station number information acquired from the plurality of radio base stations 20 in the area covered by the control. , A UPCH functional channel that is determined to be desirably distributed to another UPCH functional channel is detected (hereinafter, this detected UPCH functional channel is referred to as channel A). When the UPCH functional channel for which it is determined that it is preferable to disperse the mobile devices 10 is detected (step S3 / YES), how much dispersion is expected for the radio base station controlling this UPCH functional channel. Whether or not the determination value is defined and information about the number of mobile stations using other UPCH function channels are transmitted as control information (step S4).

Upon receiving the control information from the mobile station number management device 30, the radio base station 20 distributes the transmitted control information to the mobile unit 10 as a broadcast signal from the channel A for which the distribution instruction is issued by the control information. To do.

Next, with reference to the flowchart shown in FIG. 5, an operation procedure of the mobile unit 10 which receives the control information from the radio base station 20 will be described.

The mobile station 10 to which the control information is transmitted as the broadcast signal of the channel A from the radio base station 20 (step S10 / YES)
It is determined whether more efficient packet communication is possible by shifting to another UPCH function channel. The judgment condition is
As described above, there are other UPCH functional channels with a smaller number of mobile units than the currently used UPCH functional channels, and the reception level of the UPCH functional channel with a smaller number of mobile units is sufficient for packet communication. The reception level is high.

When a UPCH functional channel satisfying the above conditions is detected and it is determined that the UPCH functional channel transfer is appropriate (step S11), a random number is generated by the random number generator 15 (step S12) and distributed as control information. By comparing with the determined judgment value (step S1
3), it is determined whether or not the transition operation is executed (step S14). This is to prevent all mobile stations using the channel A from shifting to another UPCH functional channel.

If it is determined by the random number that the shift operation is to be performed (step S14 / YES), the shift operation to another UPCH functional channel is performed (step S15). As a result, efficient packet communication can be realized in the UPCH function channel of the transfer destination and the channel A. In step S11,
When it is determined that the shift to another UPCH functional channel is not appropriate (step S11 / NO), step S14
If it is determined that the transition operation is not to be performed (step S14 / NO), packet communication is performed using the current UPCH functional channel (step S15).

As described above, according to this embodiment, when there are UPCH function channels that are used by a plurality of mobile stations in a concentrated manner, the mobile station 10 uses the control information from the mobile station number management device 30 to control the mobile station to use. By selecting UPCH function channels with a small number of units and performing data communication, the channels can be used efficiently.

In addition, the mobile station 10 uses the mobile station number management device 3
The determination value transmitted as control information from 0 and the mobile device 10
By comparing the random number generated in step 1 above and determining whether or not to transfer the UPCH functional channel, the mobile devices 10 can be distributed so that the UPCH functional channel can be efficiently used.

Further, when the reception level of the UPCH function channel selected by the mobile unit 10 with reference to the control information is not sufficient for packet communication, the transfer to the selected UPCH function channel should not be performed. As a result, useless switching of UPCH function channels does not occur.

The operation of this embodiment described in detail above will be described again with reference to FIG. FIG. 6 is a diagram showing a selection method of the UPCH function channel of this embodiment.

In FIG. 6, the mobile unit 10B has one U
It is assumed that data is being transmitted using the PCH function channel. The data transmitted by the mobile device 10B is the data 6
0, and the UPCH functional channel 62 is used to transmit the data 60 from time T0 to T2.

At time T1 (from time T0 to time T2), it is assumed that transmission data is generated in the mobile station 10A, and the UPCH function currently used by the mobile station 10B is used as the UPCH function channel for transmission. The case where the same channel as the channel 62 is selected is shown.

In the conventional channel selection method shown in FIG. 7, the mobile station 10A is in a transmission waiting state until time T2 when the data transmission of the mobile station 10B ends. However, in the present embodiment, by the control information from the mobile station number management device 30 distributed via the wireless base station 20,
The mobile device 10A can select an unused UPCH function channel 63 other than the UPCH function channel 62, and can immediately transmit the data 61 by using the UPCH function channel 63.

The above-described embodiment is a preferred embodiment of the present invention. However, the present invention is not limited to this, and various modifications can be made without departing from the scope of the present invention. For example, in the above-described embodiment, the mobile device 10 and the mobile station number management device 30 are configured using hardware. However, the mobile device 10, the radio base station 20, and the mobile station number management device 30 can also be configured using software. In this case, it can be realized by storing a program for controlling according to the procedure shown in the flowcharts of FIGS. 4 and 5 in the mobile device 10 and the mobile station number management device 30.

[0048]

As is apparent from the above description, according to the present invention, when there are UPCH function channels that are used by a plurality of mobile stations in a concentrated manner, the mobile stations are controlled by the control information from the mobile station number management device. , UPC with few mobile units
By selecting the H function channel and performing data communication, the channel can be efficiently used.

Further, the mobile unit compares the determination value transmitted as control information from the mobile station number management device with the random number generated by the mobile unit, and determines whether or not to transfer the UPCH function channel. This allows the mobile devices to be distributed so that the UPCH functional channels can be used efficiently.

Further, when the reception level of the UPCH function channel selected by the mobile station by referring to the control information is not sufficient for packet communication, the transition to the selected UPCH function channel is not performed. ,
There is no unnecessary switching of UPCH function channels.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a system configuration of an embodiment according to the present invention.

FIG. 2 is a block diagram showing a configuration of a mobile device 1.

FIG. 3 is a block diagram showing a configuration of a mobile station number management device 3.

FIG. 4 is a flowchart showing an operation procedure of the mobile station number management device 3.

FIG. 5 is a flowchart showing an operation procedure of the mobile device 1.

FIG. 6 is a diagram showing a method of selecting a UPCH functional channel according to an embodiment of the present invention.

FIG. 7 is a diagram showing a conventional UPCH functional channel selection method.

[Explanation of symbols]

10 mobile 20 wireless base stations 30 mobile station number management device

Claims (9)

[Claims] 1. A mobile station that performs data communication using an UPCH functional channel, a radio base station that records mobile station number information including an UPCH functional channel used by the mobile station and identification information of the mobile station. And, the mobile station number information is acquired from the radio base station, the number of mobile stations to be used is detected as a UPCH functional channel in which the number of mobile stations is greater than a predetermined threshold value, and a radio base station which controls the control target channel, U for each UPCH functional channel
A mobile station number management device for transmitting mobile station number information using a PCH functional channel as control information; and the radio base station transmitting the control information to a mobile station using the control target channel, A wireless data transmission system, wherein a mobile device using the control target channel performs data communication by selecting a UPCH functional channel having a small number of mobile devices to be used from the control information. 2. The mobile station number management device transmits, to the radio base station, a determination value indicating how much the mobile devices that use the control target channel are dispersed, as the control information, to the control target channel. When a mobile station to be used selects a UPCH functional channel that uses a small number of mobile stations based on the control information, a random number is generated, and whether to move to the selected UPCH functional channel by comparing the random number with the judgment value. The method according to claim 1, characterized in that it is determined whether or not it is determined.
The wireless data transmission system described. 3. A mobile station using the control target channel is an UPCH with a small number of mobile stations used according to the control information.
When the function channel is selected, it is determined whether or not the reception level of the UPCH function channel is a reception level at which packet communication is possible, and it is determined whether or not to shift to the selected UPCH function channel. Item 1. The wireless data transmission system according to Item 1 or 2. 4. A mobile station number management device for managing the number of mobile stations using the UPCH function channel for each UPCH function channel, a mobile station for performing data communication using the UPCH function channel, and the mobile station. A UPCH function channel control method in a wireless data transmission system, comprising: a UPCH function channel used by a mobile station and a radio base station in which mobile station number information including identification information of the mobile station is recorded; In the step of detecting the number of mobile units from the radio base station and detecting a UPCH functional channel in which the number of mobile units to be used is larger than a predetermined threshold as a control target channel, a radio for controlling the control target channel UPC to base station
A first control information transmitting step of transmitting, as control information, information on the number of mobile units using the UPCH function channel for each H function channel, in the radio base station receiving the control information, the control target channel A second control information transmitting step of transmitting the control information to a mobile device using the control information, and the mobile device receiving the control information selects a UPCH functional channel having a smaller number of mobile devices to be used from the control information. UPCH comprising a UPCH functional channel selection step and a data communication step of performing data communication using the UPCH functional channel.
Functional channel control method. 5. A mobile station receiving the control information, the UP having a smaller number of mobile stations used by the control information.
When a CH functional channel is selected, a first determining step of determining whether or not the reception level of the UPCH functional channel is a reception level at which data communication is possible and determining whether to shift to the selected UPCH functional channel. The UPCH functional channel control method according to claim 4, further comprising: 6. The mobile station number management apparatus transmits, to the radio base station as the control information, a determination value indicating how much the mobile stations that use the control target channel are dispersed, and receives the control information. The selected mobile station uses the control information to select an UPCH functional channel that uses a small number of mobile stations, generates a random number, and shifts to the selected UPCH functional channel by comparing the random number with the judgment value. The UPCH functional channel control method according to claim 4 or 5, further comprising a second determination step of determining whether or not it is. 7. A mobile station number management device that manages the number of mobile stations that use the UPCH function channel for each UPCH function channel, a mobile station that performs data communication using the UPCH function channel, and the mobile station. A UPCH function channel control program in a wireless data transmission system including a UPCH function channel used by a mobile station and a wireless base station that records mobile station number information including identification information of the mobile station, the mobile station number management device In, the detection process of acquiring the number of mobile units from the wireless base station and detecting a UPCH functional channel in which the number of mobile units to be used is larger than a predetermined threshold as a control target channel, and a radio for controlling the control target channel. UPC to base station
A first control information transmission process for transmitting, as control information, the number-of-mobile-units information using the UPCH function channel for each H function channel, and in the wireless base station that has received the control information, the control target channel Performing a second control information transmission process of transmitting the control information to a mobile device that uses the control information, and selecting a UPCH functional channel with a small number of mobile devices to be used from the control information in the mobile device that has received the control information. UPC characterized by executing UPCH functional channel selection processing and data communication processing for performing data communication using the UPCH functional channel.
H function channel control program. 8. The mobile station receiving the control information, UP having a small number of mobile stations used by the control information.
When a CH function channel is selected, a first determination process of detecting whether or not the reception level of the UPCH function channel is a reception level at which data communication is possible and determining whether or not to shift to the selected UPCH function channel The UPCH function channel control program according to claim 7, which executes the following. 9. The mobile station number management apparatus transmits, to the radio base station, a determination value indicating how much the mobile stations using the control target channel are dispersed, as the control information, and receives the control information. The selected mobile station uses the control information to select an UPCH functional channel that uses a small number of mobile stations, generates a random number, and shifts to the selected UPCH functional channel by comparing the random number with the judgment value. 9. The UPCH function channel control program according to claim 7, which executes a second determination process for determining whether or not the UPCH function channel control program is executed.