JP2001103543A - Method for assigning wireless channel and wireless communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively utilize a channel resource in a wireless communication system. SOLUTION: In the wireless communication system where a communication channel resource between a wireless base station and a mobile and/or fixed wireless terminal station is assigned in response to the occurrence of a call, the wireless terminal station makes a link channel setup request to the wireless base station and when the wireless base station cannot assign a link channel, the system takes turns to the setup requests and assigns an idle channel to the link channel on the occurrence of the idle channel to which the link channel is assigned after a specified time as its control.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication system and a channel allocation method for allocating communication channel resources between a radio base station and a radio terminal station (both mobile and fixed) according to the occurrence of a call. Things.

[0002]

2. Description of the Related Art In a conventional radio communication system, the following radio channel allocation method is performed.

[0003] First, when a wireless terminal station issues a link channel establishment request to a wireless base station and a valid free channel is not allocated, the wireless base station immediately has a slight delay, but with a slight delay. Returns channel assignment refusal. After receiving the link channel assignment rejection, the wireless terminal station tries to acquire a link channel by the following method. (1) Make a link channel establishment request to another wireless base station. (2) After a certain time, a link channel establishment request is made again to the same radio base station.

Various methods have been proposed for a scheduling method for making a link channel establishment request again, but these are roughly divided into the above two methods.

[0005] However, these procedures are based on the premise that one radio terminal station can recognize radio waves from a plurality of radio base stations. In other words, when a user using a wireless terminal station makes a call, if the link base station to which the link channel establishment request was first sent is rejected for link channel assignment, the link to another wireless base station is made. Make a channel establishment request. If the request is rejected by the wireless base station, a link channel establishment request is made to another wireless base station. The wireless terminal repeats this until a link channel is allocated. Of course, if the radio terminal station rejected all radio base stations capable of recognizing radio, or if the number of times the request was repeated reached a preset number, no link channel was allocated. For this reason, the calling procedure is usually terminated.

When one wireless terminal station can recognize only one or a small number of wireless base stations, a request for establishing a link channel is made again to the same wireless base station.

[0007] These methods aim at the radio terminal station acquiring the link channel so that the user can talk as soon as possible.

[0008]

However, in the above-mentioned prior art, since a plurality of link channel establishment request / assignment rejection sequences are generated in response to one call request by the user, there is no effective free channel. In this case, the congestion state will be further deteriorated.

[0009] In addition, since the radio base station that has received the request immediately determines a valid vacant channel state, if a channel that is being used becomes available after a slight time lag and becomes available, that channel is used. It cannot be allocated and the channel resources cannot be used effectively.

An object of the present invention is to solve these problems of the prior art and to make effective use of channel resources.

[0011]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention allocates communication channel resources between a radio base station and a mobile and / or fixed radio terminal station in accordance with the occurrence of a call. In a wireless communication system, the wireless terminal station makes a link channel establishment request to the wireless base station, and when the wireless base station cannot allocate a link channel, waits for the establishment request in order and waits for a certain period of time. When a vacant channel that can be allocated is generated by that time, the channel is controlled to be allocated.

Further, in a radio communication system for allocating communication channel resources between a radio base station and a mobile and / or fixed radio terminal station in accordance with the occurrence of a call, the radio terminal station is detected at least by call generation. A channel establishment processing unit that performs processing for acquiring a channel according to a request from the unit;
A signal transmission / reception unit for transmitting / receiving information between the channel establishment processing unit and the radio, and a timer for monitoring a time from a link channel establishment request issued by the channel establishment processing unit to receiving a response from the radio base station. A channel resource management unit that manages all channel resources to which the radio base station may be assigned at least CS; a signal transmission / reception unit that transmits / receives information between the radio and the channel resource management unit;
A link channel establishment request storage unit for sequentially recording the link channel establishment request when the channel resource management unit receives a link channel establishment request from a wireless terminal station and the assignment is not possible; A timer that manages the maximum time during which the request stored in the storage unit can wait for a channel to be available, and the timer of the wireless base station is set to a shorter count time than the timer of the wireless terminal station. did.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a system configuration of the present invention. The wireless terminal station PS includes the following parts. That is, a call occurrence detection unit 1 for detecting the occurrence of a call by a user's key (not shown) operation or the like, a channel establishment processing unit 2 for performing a process for acquiring a channel in response to a request from the call occurrence detection unit 1, a channel establishment A signal transmitting / receiving unit 3 for transmitting / receiving information between the processing unit 2 and the radio; a timer 4 for monitoring a time from a link channel establishment request issued by the channel establishment processing unit 2 to receiving a response from the radio base station CS; A display unit 5 for transmitting a tone or a message for notifying a user according to the result of the assignment / rejection from the processing unit 2; Incidentally, the timer 4 is set to a limit time during which the user can wait for a response.

The radio base station CS comprises the following parts. That is, the channel resource management unit 7 that manages all the channel resources that the radio base station CS may allocate, the signal transmission / reception unit 8 that transmits and receives information between the radio and the channel resource management unit 7, and the channel resource management unit 7 When a link channel establishment request from a certain wireless terminal station PS is received and assignment is impossible, the link channel establishment request storage unit 9 and the link channel establishment request storage unit 9 that record the requests sequentially. The stored request is a timer 10 that manages the maximum time that a channel can be freed up, an antenna 11. Note that this timer 11
Is a time equivalent to the timer 4 of the wireless terminal station PS,
To end the sequence normally, the wireless terminal station PS
It is desired that the timer is slightly shorter than the timer 4.

Next, a series of operations according to the present invention will be described.

The call occurrence detecting section 1 detects the occurrence of a call by a user's key operation or the like, and notifies the channel establishment processing section 2 of the detection. Based on the notification, the channel establishment processing unit 2 sends a link channel establishment request to the signal transmission / reception unit 3 to acquire a communication channel, and at the same time,
If there is no response from S, the monitoring timer 4 is started to interrupt the processing. The signal transmitting / receiving unit 3 of the wireless terminal station PS converts the signal into a wireless signal and sends it to the wireless base station CS. The signal transmitting / receiving unit 8 of the wireless base station CS receives the signal and passes it to the channel resource managing unit 7. In response to the request, the channel resource management unit 7 sends a link channel assignment to assign the request if it can determine that the request can be assigned immediately.
A signal transmitting / receiving unit 8 of the radio base station CS and the radio terminal station PS;
3 and the channel establishment processing unit 2
The timer 4 is stopped to inform the display unit 5 of the normal assignment. However, when the channel resource management unit 7 cannot immediately determine that the assignment is possible, the channel resource management unit 7 stores the request in the link channel establishment request storage unit 9. The channel resource management unit 7 refers to the request stored in the link channel establishment request storage unit 9 when the channel resource used elsewhere is vacant,
If there is a request, the oldest request is taken out and a link channel allocation is sent to allocate a free channel, and the link channel is allocated in the same procedure as described above.

The request stored in the link channel establishment request storage unit 9 is monitored by a timer 10 of the radio base station CS. 10 is notified to the channel resource management unit 7 and a link channel rejection is sent to reject the request, and the channel establishment process is performed via the signal transmission / reception units 8 and 3 of the radio base station CS and the radio terminal station PS. It is transmitted to part 2. Thereafter, the channel establishment processing unit 2 stops the timer 4 of the wireless terminal station PS and informs the display unit 5 that the assignment has not been performed normally.

Since the communication system of the present invention is configured as described above, if the requests for the channel resources that can be allocated by the radio base station are accumulated, the channel resources are allocated immediately after the channel is vacant. The establishment of the time of being unused and remaining unused is reduced, and the resources can be effectively used.

This will be described with reference to FIG. FIG.
Is 3 of the channel resources that can be assigned by the radio base station CS.
Two cases are shown. FIG. 2A shows the radio base station CS
This is a case where the channel request is immediately rejected, and if a channel request is received while using three simultaneous channels, the channel request is rejected, and immediately after that, the channel remains free even if the channel is free. FIG. 2B shows a case where a request is stored for a certain time according to the present invention. When a channel request is further received when using three simultaneous channels, and the channel is subsequently vacant, the channel is allocated, and the vacant time is almost used. In other words, the call blocking rate of the wireless system decreases, and the traffic volume to be processed increases. In addition, since a pair of link channel establishment request / assignment rejection sequence occurs for one call request by the user, the congestion state can be minimized even when there is no valid free channel. .

[0020]

As described above, according to the system configuration and the allocation method of the present invention, the resources can be effectively used.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a system configuration of the present invention.

FIGS. 2A and 2B are explanatory diagrams showing three cases of channel resources that can be allocated by the radio base station CS. FIG. 2A shows a case where the radio base station CS rejects immediately, and FIG. The case where the request is stored for a certain time is shown.

[Explanation of symbols]

 PS wireless terminal station 1 call occurrence detection unit 2 channel establishment processing unit 3 signal transmission / reception unit 4 timer 5 display unit 6 antenna CS radio base station 7 channel resource management unit 8 signal transmission / reception unit 9 link channel establishment request storage unit 10 timer 11 antenna

Claims (2)

[Claims] 1. A wireless communication system for allocating communication channel resources between a wireless base station and a mobile and / or fixed wireless terminal station according to the occurrence of a call. Request to establish a link channel,
When the radio base station cannot allocate a link channel, it waits for the establishment request in order, and when a vacant channel that can be allocated occurs by a certain period of time, controls to allocate the channel. Channel assignment method. 2. In a radio communication system for allocating communication channel resources between a radio base station and a mobile and / or fixed radio terminal station according to the occurrence of a call, the radio terminal station is detected at least by call generation. A channel establishment processing unit that performs processing for acquiring a channel in response to a request from the unit, a signal transmission and reception unit that transmits and receives information between the channel establishment processing unit and radio, and a link channel establishment request issued by the channel establishment processing unit. And a timer that monitors the time until a response from the radio base station is received, and the radio base station comprises:
A channel resource management unit that manages at least all the channel resources that may be allocated by the CS; a signal transmission / reception unit that transmits and receives information between the radio and the channel resource management unit; If it cannot be assigned when a link channel establishment request is accepted,
A link channel establishment request storage unit for sequentially recording the establishment requests, and a timer for managing a maximum time during which the request stored in the link channel establishment request storage unit can wait for a channel to be free. A timer of the wireless base station is set to a shorter count time than a timer of the wireless terminal station.