JPH05316038A - Call transmission control method - Google Patents

Abstract

PURPOSE:To reduce the congestion state in a radio zone with a simple method by adding pseudo channel information representing call transmission by a mobile station but not establishing a call to transmission channel information. CONSTITUTION:A pseudo channel is included into information of an outgoing control radio signal L4 in response to the operating state of an outgoing control channel controlled by a control station 1 such as a fault recovery or the like at a base station 4. A mobile station 5 acquires the pseudo channel of the signal L4 and makes transmission through the channel but the control is not in progress. Thus, the mobile station 5 after a prescribed time acquires the information content in the signal L4 again and makes transmission. For that time the probability of simultaneous calls from plural mobile stations 5 is reduced and collision of an incoming call control radio signal L3 is avoided. Thus, the congestion state is simply reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to transmission / reception control of a control channel between a radio base station and a mobile station in a mobile telephone communication system, and in particular, congestion is generated by using transmission control channel information captured by the mobile station. The present invention relates to a call origination control method for reducing the traffic.

[0002]

2. Description of the Related Art In a conventional mobile telephone, which is a mobile communication, a plurality of mobile telephone exchanges connected to a fixed telephone network, which is an existing facility, and a plurality of wireless line control stations are provided in each of these mobile telephone exchanges. A plurality of wireless base stations are further connected to this wireless circuit control station. Then, this wireless base station receives wireless communication from a mobile station loaded with mobile terminals that have moved within the service area in charge and connects to the fixed telephone network through the above-mentioned wireless line control station and car telephone exchange office. , The line connection is exchanged with the intended other party. The control channel transmitted from such a mobile station is fixed irrespective of the traffic situation in the wireless section based on the transmission control channel information transmitted from the control station via all wireless base stations.

This conventional transmission control will be described with reference to FIG. In FIG. 2, the mobile station 5 and the radio base station 4
Therefore, the radio base station 4 and the control station 1 are connected by a fixed line. Based on the information of the downlink control signal L6 between the mobile station 5 and the radio base station 4, that is, the uplink transmission control channel and the transmission permission information, etc., the uplink transmission control signal L5.
Is raised. At this time, since the uplink transmission control signal L5 is raised regardless of the radio use status between the mobile station 5 and the radio base station 4, there is a high possibility that a plurality of mobile stations 5 will transmit at the same time in the case of congestion. As a result, the uplink transmission control signal L5 causes a data error due to a collision, and the frequency of situations where the control station 1 is not notified increases. Only the downlink control signal L6 correctly received by the radio base station 4 without any data error due to simultaneous transmission is notified to the control station 1 as the control signal L7 to control the call.

[0004]

However, in the above-described conventional radio section transmission control, there is a high possibility that a plurality of mobile stations will simultaneously transmit when the radio section is congested, and data collisions will cause an error. Will occur more frequently. For this reason, since the call originated by the mobile station is not accepted and the call is originated again, the same phenomenon as described above occurs again, and the call is eventually not accepted by the control station 1, and it is difficult to alleviate the congestion situation. there were.

An object of the present invention is to eliminate the above-mentioned conventional problems and to provide a transmission control method capable of reducing the congestion state in the wireless section by a simple method.

[0006]

According to a solution of the present invention for solving the above-mentioned problems, a plurality of radio base stations are arranged under at least one control station and all transmission channel information from the control station is stored. In a transmission control method of a mobile communication system in which a radio base station transmits to each mobile station at the same frequency and transmits based on the transmission channel information received by the mobile station, a use situation of a downlink transmission control channel controlled by the control station In order to reduce the congestion state of the uplink transmission control channel by adding pseudo channel information that the mobile station can call in the transmission channel information notified by the control station via the plurality of radio base stations according to Characterize.

[0007]

The channel used when the mobile station makes a call is notified from the control station to each mobile station via a plurality of radio base stations as information of the downlink control signal. When the line recovers after a failure such as a control station, a large number of mobile stations transmit at the same time and the wireless section becomes congested and data collision occurs. A pseudo channel is provided in the empty channel indicated by and the mobile station is called by this pseudo channel. Since the line connection is not made in the call by the pseudo channel, the call process by the mobile station is prompted again, the collision of the uplink transmission control radio signal L3 can be avoided, and the congestion state can be reduced. ..

[0008]

EXAMPLE An example of the present invention will be described below with reference to FIG. FIG. 1 is a block diagram of an embodiment of the present invention. The control station 1 has a plurality of radio base stations 4. Each of the plurality of wireless base stations 4 is provided with a zone of the electric field strength 6 of the wireless base stations, which indicates the reach of the radio wave. Each wireless base station 4 is in wireless communication with the mobile station 5 located within the electric field strength 6 of the wireless base station.

The control station 1 determines a control signal received from a plurality of radio base stations 4 and controls an uplink transmission control channel, which is the information content of the downlink control signal to each radio base station 4. More specifically, the control circuit 2 in the control station 1 controls the information content of the downlink signal according to the congestion situation of the uplink transmission control channel for transmitting the call signal from the mobile station. The control circuit 2 of the control station 1 and the control signal transmission / reception circuit 3
The control signal L1 between the control signal transmitting / receiving circuit 3 and the use status information of the transmission signal received from the control signal transmitting / receiving circuit 3 is a downlink control signal from the control station 1 to the control circuit 2, that is, the channel used when the control station 1 transmits. It is composed of information and. The control signal transmission / reception circuit 3 in the control station 1 is a circuit that transmits / receives the control signal L2 to / from the plurality of radio base stations 4, and the plurality of radio base stations 4 are simultaneously transmitted using the downlink control channel. Report information to. Also, it receives a transmission control signal and the like of the control signal L2 coming from the radio base station 4 and notifies the control circuit 2 of it. The radio base station 4 transmits / receives control signals L3 and L4 to / from the mobile station 5 moving in the electric field strength 6 in each zone. The uplink transmission control radio signal L3 is a transmission control signal transmitted from the mobile station 5 to the radio base station 4 (normally referred to as an uplink transmission control signal). The downlink control radio signal L4 is a radio control signal transmitted from the radio base station 4 to the mobile station 5 as a downlink control signal. The information of the downlink control radio signal L4 is a channel or the like when the mobile station 5 transmits. The electric field strength 6 indicates the effective range of radio waves transmitted from each radio base station 4.

In the above structure, when the failure on the base station side is recovered, a large number of mobile stations 5 transmit all at once and the wireless section becomes congested, and the uplink transmission control wireless signals L3 collide with each other, resulting in data corruption. I will end up. For this reason, the mobile station 5 again transmits, and congestion becomes more severe. The information of the downlink control radio signal L4 includes the channel when the mobile station 5 originates, and the downlink control radio signal L4.
The information of (1) includes a pseudo channel which is different from a channel which is not actually used by the control circuit 2 when the downlink control radio signal L4, that is, the uplink control signal of the control signal L1 is congested. The mobile station 5 receives the downlink control radio signal L
The pseudo channel of 4 is captured and transmitted on that channel, but the control does not proceed. The mobile station 5
After a certain period of time, the information content of the downlink control radio signal L4 is captured and transmitted again. During that time, the probability of simultaneous calls from a plurality of mobile stations 5 is reduced. As a result, the congestion state can be reduced.

[0011]

As described above, in the case where the base station side recovers after being down due to a failure or the like, the probability of simultaneous transmission from mobile stations is high, and the uplink transmission control signals from a plurality of mobile stations are destroyed. Will be done. Therefore, the control station notifies the mobile station of information including a pseudo uplink transmission channel according to the usage state of the uplink control signal. Although the mobile station captures this pseudo-originating channel and performs the transmitting operation, it fails and captures another channel again after a certain period of time and transmits, so the probability of simultaneous calls is reduced and the congestion is relieved. be able to.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 1 control station 2 control circuit 3 control signal transmission / reception circuit 4 radio base station 5 mobile station 6 electric field strength of radio base station L1 control signal L2 control signal L3 upstream transmission control wireless signal L4 downlink control wireless signal L5 upstream transmission control signal L6 downlink control Signal L7 control signal

Claims (1)

[Claims] 1. A plurality of radio base stations are arranged under at least one control station, and transmission channel information from the control stations is transmitted from all radio base stations to each mobile station at the same frequency. In a transmission control method of a mobile communication system that transmits based on the received transmission channel information, a transmission in which the control station reports via the plurality of radio base stations according to the usage status of a downlink transmission control channel controlled by the control station. A call origination control method for reducing congestion of an uplink call origination control channel by adding to the channel information pseudo channel information that the mobile station can make a call but cannot establish a call.