JPH09163428A - Processing method when base station is in busy state for radio communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the rate of call origination by performing communication while switching a busy base station to another linkable base station by searching other base stations by a mobile terminal when the base station is in a busy state. SOLUTION: In this processing method for radio communication system provided with plural base stations 1 and 2 connected to a telephone line and connected through a radio control channel to a mobile terminal 3 at all times, when the base station 1 or 2 is in the busy state, a link establishment refuse signal is early transmitted from the base station 1 or 2 corresponding to a call originated from the mobile terminal 3. The mobile terminal 3 received with the link establishment refuse signal searches the control channel of the other base station 2 or 1 and establishes a link channel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention allows a mobile terminal to search for a control channel and switch to another base station to establish a link channel when a call is made from a mobile terminal and the base station is busy. The present invention relates to a processing method when a base station is busy in a wireless communication system that can be used.

[0002]

2. Description of the Related Art FIG. 3 is a diagram showing a configuration example of a PHS base station. Conventionally, the communication processing system of the PHS base station 1 and the mobile terminal 3 has a hierarchical structure. Layer 1 (first layer section) is mainly composed of hardware, and comprises a call setting section 1-5 for setting a communication path, and transmits / receives a signal to / from the mobile terminal 3 by radio waves via an antenna (not shown). I am supposed to do it.

Further, the layer 2 (second layer portion) is composed of a radio management portion 1-4 by software, and is adapted to perform link control such as protocol processing. A layer 3 (third layer part) is a PBS management part 1-2 that manages a message level, and manages the line control part 1-1, the supplementary service control part 1-3 and the wireless management part 1-4. It is like this. Each layer has a CPU and processes data.

Radio management section 1 of layer 2 (second layer section)
Reference numeral 4 controls a communication task 1-4-1 that communicates with the PBS management unit 1-2 of the upper layer, a communication task 1-4-3 that communicates with the path setting unit 1-5 of the lower layer, and a control channel (CCH). A mobile terminal 3 having a control channel task 1-4-2 and other tasks and making a call (control channel)
Link channel allocation processing (communication channel allocation processing) and the like are performed.

In addition, the radio management section 1-4 of the layer 2 (second layer section) sends a busy signal when the communication volume (traffic) with the mobile terminal 3 becomes large and the processing cannot be performed, and the other party moves. Busy control is performed by notifying the terminal 3 to temporarily stop the transmission and process the delayed communication.

Radio management unit 1 of layer 2 (second layer)
4 has a plurality of buffers to store and process the received data. However, the usage status of the buffers is constantly monitored, and when the remaining number of buffers falls below the set value, the communication partner (mobile terminal 3) is busy. A signal is sent, communication of the other party is temporarily stopped to process the communication data that has been stagnant, and when the number of available buffers is restored, a busy recovery signal is sent to the other party of communication (mobile terminal 3) and the transmission is temporarily stopped. Cancel and start communication. Communication busy control is performed by the above method.

FIG. 4 is a diagram showing a control method when the conventional PHS base station is in a busy state. Mobile terminal 3 is PHS
A case of making a call from within the service area of the base station 1 will be described with reference to FIGS. 3 and 4. The mobile terminal 3 is normally at time t
1, the power is turned on, the control channel is searched at time t2, and the downlink control channel information of the PHS base station 1 is being received.

When a call is made from the mobile terminal 3 at time t4, a link channel establishment request is transmitted to the PHS base station 1 and P
If the HS base station 1 is not busy, the control channel task 1-4-2 allocates the link channel, notifies the mobile terminal 3 via the call setting unit 1-5, and the call is started. In the busy state, the link channel cannot be assigned and the signal (notice of link assignment) is not returned to the mobile terminal 3.

The mobile terminal 3 again makes a call at time t6, which is 1.2 seconds later, and retransmits the link channel establishment request. PHS
If the base station 1 is busy, a specified number of times (time t
(6, t7, t8 three times), and if the busy state, the call ending process is performed at time t9.

[0010]

However, as mentioned above, when the PHS base station 1 recovers the busy state while the mobile terminal 3 is retransmitting the link channel establishment request, it is possible to talk, but if the busy state cannot be recovered. The mobile terminal 3 cannot make a call. There is a problem that the user does not know why the mobile terminal 3 cannot make a call even though the LCD display indicating the callable state is lit and the radio wave intensity is high.

When the mobile terminal 3 makes a call in an area with a large amount of traffic (area with a large amount of communication), another PH
There is a possibility that the S base station is in the vicinity, but there is a problem that the conventional control method cannot switch to another PHS base station for communication.

The present invention has been made in view of the above points, and in order to eliminate the above-mentioned problems, when the radio base station is in a busy state, the mobile terminal searches for another radio base station to perform radio communication. An object of the present invention is to provide a control method when a base station is in a busy state in a wireless communication system in which a calling rate is improved by switching and communicating with a base station.

[0013]

In order to solve the above-mentioned problems, the invention according to claim 1 of the present application is provided with a plurality of base stations connected to a telephone line, and a mobile terminal and a mobile terminal are always connected via a wireless control channel. A method of processing when a base station is busy in a connected wireless communication system, wherein the base station is linked to a call from the mobile terminal when the base station is busy as shown in FIG. The mobile terminal which transmits the establishment refusal signal and receives the link establishment refusal signal searches the control channel of another base station and establishes the link channel.

The invention described in claim 2 is the same as claim 1
In the processing method when the base station is in a busy state in the wireless communication system described in, the base station has a plurality of layers from the upper to the lower to perform communication processing, when the base station is busy,
It is characterized in that a link establishment refusal signal is transmitted from the mobile terminal to the call origination without notifying the lower layer.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a PHS according to the present invention.
It is a figure which shows the control method at the time of a busy state of a base station. The configuration of the PHS base station of the present invention is substantially the same as that of FIG. 3, and therefore its explanation is omitted. A control method when the PHS base station of the present invention is in a busy state will be described with reference to FIGS. 1 and 3.

The mobile terminal 3 is normally powered on at time t1, searches for a control channel at time t2, and is in a state of receiving downlink control channel information of the PHS base station 1.

As shown in FIG. 2, in the common area of the service area 1a and the service area 2a, the downlink control channel information of the PHS base station 2 can be received, but only one of them (the PHS base station 1 in the figure) is received. Downlink control channel information is received.

When a call is made from the mobile terminal 3 at time t4, a link channel establishment request is transmitted to the PHS base station 1 and P
If the HS base station 1 is in a busy state, the control channel task 1-4-2, which is a lower layer, cannot perform link channel allocation, and sends a signal of link channel allocation refusal to the mobile terminal 3
Immediately return to (details described later). The mobile terminal 3 confirms that it cannot make a call at time t6, and searches for a downlink control channel of another station (PHS base station 2) at time t7.

When the mobile terminal 3 is within the service area 2a (see FIG. 2), the downlink control channel of the PHS base station 2 is received at time t8 and a link channel establishment request is transmitted to the PHS base station 2. If the PHS base station 2 is not in the busy state, it receives the link channel establishment request at time t9, allocates the link channel, and returns it. Then, a synchronous burst and a call burst signal are transmitted and received, a data link is connected, a call sequence is executed, and a call is started.

PHS base station 1 (or PHS base station 2)
Performs the following processing when it falls into a busy state. Control channel task 1-4 for controlling transmission of downlink control channel
2 receives the busy status from another task and stores that it is busy. When the mobile terminal 3 makes a call to the busy PHS base station 1 (or PHS base station 2), the control channel task 1-4-2 receives the link channel establishment request.

Since the control channel task 1-4-2 which has received the link channel establishment request is in the busy state, the PBS management unit 1 of the upper layer 3 1-to recover the busy state early.
2, a link channel allocation refusal signal (call refusal) is sent to the mobile terminal 3 immediately via the communication task 1-4-3 and the path setting unit 1-5 without requesting the link channel allocation to the mobile terminal 2. To do. When the mobile terminal 3 receives the refusal to allocate the link channel at the time t6, it recognizes that the PHS base station cannot make a call, and searches for a downlink control channel of another PHS base station at the time t7 to receive it. If possible, send a link channel establishment request.

As described above, according to the present embodiment, the mobile terminal 3 intentionally switches to another PHS base station to make a call if the PHS base station is busy at the time of calling. Usually, PHS base stations are often installed densely in an area with a large amount of communication, and in a place where service areas overlap, processing is performed by the control method of the present invention to call the mobile terminal 3. be able to.

In the above embodiment, PHS is used.
Although the processing method in the base station busy state in the system has been described as an example, the processing method in the base station busy state of the present invention is not limited to this, and the processing in the wireless base station busy state in the wireless communication system It is natural that it can be used for.

[0024]

As described above, according to the present invention, the following excellent effects can be obtained. (1) A mobile terminal intentionally switches to another radio base station to make a call if the radio base station is busy at the time of calling, but in a high communication area, the radio base stations are usually crowded. In many cases where the service areas are installed, by performing the processing with such a control method in a place where the service areas overlap, the excellent effect that the calling rate of the mobile terminal can be improved is obtained.

(2) In addition, the conventional busy state is not recovered, the LCD display indicating that the mobile terminal is in a callable state is lit, and it is unknown why the call cannot be made even though the radio field intensity is high. The problem is reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a control method in a busy state of a PHS base station according to the present invention.

FIG. 2 is a diagram showing a positional relationship between service areas of a plurality of PHS base stations and mobile terminals.

FIG. 3 is a diagram showing a configuration example of a PHS base station.

FIG. 4 is a diagram showing a control method when a conventional PHS base station is in a busy state.

[Explanation of symbols]

 1 PHS base station 1-1 Line control unit 1-2 PBS management unit 1-3 Supplementary service control unit 1-4-1 Communication task 1-4-2 Control channel task 1-4-3 Communication task 1-5 Call setting Part 2 PHS base station Part 3 Mobile terminal

Claims (2)

[Claims] 1. A method of processing when a base station is in a busy state in a wireless communication system, which comprises a plurality of base stations connected to a telephone line and is always connected to a mobile terminal through a wireless control channel, When the base station is in a busy state, the base station transmits a link establishment refusal signal in response to a call from the mobile terminal, and the mobile terminal receiving the link establishment refusal signal controls the control channel of another base station. Is established and a link channel is established, the processing method when the base station is in a busy state in a wireless communication system. 2. The base station has a plurality of layers from upper to lower for performing communication processing, and when the base station is in a busy state,
2. The base station busy state in the wireless communication system according to claim 1, wherein the lower layer transmits the link establishment refusal signal in response to a call from the mobile terminal without notifying the upper layer. Processing method.