JPS5915343A - Broadcasting system of calling channel designating information of mobile radio communication - Google Patents

Abstract

PURPOSE:To switch quickly each end office to a calling channel, by changing the broadcasting intervals of the switching designating information on the calling channel under use in accordance by the time elapsed exclusive for call channel of a group including the end office which delivered a call request. CONSTITUTION:The data received at a receiving part is analyzed at a control part 15. If a call request is detected, an idle channel is selected and allotted to the group including the end office which delivered a call request. The calling channel designating information is stored in a memory area 18 of a selecting part 16 and then read out through the part 16 to be transmitted to a terminal station from a transmitting part 14 via a control channel. The part 16 changes the transmitting frequency of each calling channel designating information by the time elapsed exclusive for calling channel which is allotted to the group. As a result, each terminal station can be switched quickly to the specific calling channel.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field to which the Invention Pertains] The present invention relates to a multi-contention channel access system for allocating a large number of radio channels to a large number of groups, and particularly relates to a communication channel designation information broadcasting system.

[Description of prior art]

Conventional business mobile communications are mainly used for command communications. In this command communication, one unique communication frequency is allocated to a unit called a group consisting of multiple terminal stations, and each layer group monopolizes the uniquely allocated communication frequency and uses the communication path. form. Therefore, as the number of groups increases, the required number of communication frequencies increases. However, since there is a limit to the number of allocated communication frequencies, the number of groups is necessarily limited.

On the other hand, when examining the usage status of a single telephone frequency, it is found that it is not always in a telephone call state and is often vacant.

It is possible to temporarily form another group of communication channels on this vacant communication frequency and use the communication frequency by time-sharing. A multi-channel access system (MCA) was developed based on this idea, in which frequencies allocated for calls are shared among several groups.

In the MCA system, a radio channel is usually divided into a control channel and a speech channel, and each terminal station is in a state where it is always on standby for control signals on the control channel. When a call request is received from another terminal station belonging to the same group, the base station broadcasts the communication channel number and group number as a pair to each terminal station via the control channel.

To explain this in more detail, assume that a certain terminal station issues a call request through an uplink control channel. The base station receives the call request and selects an empty communication channel to allocate to the group that includes the terminal station that originated the call request. Furthermore, the base station broadcasts the call channel number and group number through the downlink control channel, and controls the terminal stations belonging to the group that includes the terminal station that issued the call request to switch to the assigned call channel. The terminal station always receives the downlink control channel emitted from the base station, and when a group to be reviewed by the terminal station is designated, the terminal station switches to the designated call channel. As a result, a communication path is formed with the terminal station that made the call request, and a communication path is formed within the same group.

At this time, the base station does not check whether each terminal station has switched to the communication channel. This is necessary to confirm each terminal station, which takes a long time. Instead, the communication channel designation information is repeatedly sent to each terminal station via the control channel, and the communication channel designation information is sent to each terminal station via the control channel. We are screening the connection rate. In such a method,
Since the base station must repeatedly broadcast switching information for all communication channels currently in use, as the number of communication channels in use increases, the broadcast time of each communication channel designation information becomes longer. As the broadcast time becomes longer, once the terminal station fails to receive the communication channel designation information, it is unable to switch to the designated communication channel for a long time until the next broadcast is received. In this way, each terminal station cannot receive the information broadcast on the call channel until it switches to the designated call channel, but the information on the call channel immediately after the call is made is often particularly important. It is necessary to be able to receive designated call channel designation information as soon as possible in order to receive commands and participate in conversations.

In this way, the advantage of the conventional MCA method is that by timely allocating vacant communication channels to the group that includes the terminal station that made the call request, the number of communication channels can be made smaller than the number of groups, and frequencies can be used more effectively. There is, but
If the broadcast cycle of the call channel designation information becomes long, if the terminal station fails to receive the call channel designation information immediately after a call is made, it will switch to the call channel for a long time until the next designation information is broadcast. Unable to do so, the important l immediately after making a call to Bamboo? There are 5 drawbacks, such as not being able to receive i-mail messages.

[Purpose of the invention]

An object of the present invention is to change the broadcast interval of tearing specification information regarding the communication channel being used depending on the elapsed time for exclusive use of the communication channel by the group hosting the terminal station that has issued the call request. To provide a system that improves the connection rate of each terminal station to a designated communication channel and allows each terminal station to quickly switch to a communication channel.

[Summary of the Invention] The present invention measures the elapsed exclusive time of a communication channel assigned to a group including a terminal station that has issued a call request, and calculates the broadcast interval of communication channel designation information. This method increases the connection rate of each terminal station within the same group to a designated communication channel. In the present invention, the interval at which call channel designation information is broadcast for the group to which the terminal station that made the call request belongs on the control channel is determined as follows. In other words, the elapsed time for exclusive use of the call channel of the group that specifies the call channel is measured,
The communication channel designation interval is shortened for a group with a short elapsed time, and the call channel designation interval is lengthened for a group with a long elapsed time. This allows each terminal station in the designated group to quickly switch to the designated communication channel and communicate.

[Explanation based on examples]

Hereinafter, the present invention will be explained based on the drawings.

FIG. 1 is a block diagram of an embodiment of a base station according to the present invention.

In the figure, the base station includes a communication channel receiving section 11 and a control channel receiving section 12 connected to receiving antenna E0, a control section 15 to which the outputs of these two receiving sections 11 and 12 are input, and a control section 15 that receives the outputs of these two receiving sections 11 and 12. A call channel designation information selection unit 16 that selects and updates one call channel designation information under the control of It is comprised of a control channel transmitting section 14 that broadcasts via a communication channel transmitting section 13, and a communication channel transmitting section 13.

The control channel receiving section 12 receives uplink control data transmitted from the terminal station via the control channel, and sends it to the control section 15. The control unit 15 also cancels the received data sent from the receiving unit 12, and if it is a call request, selects one of the available call channels and uses that channel to send the call request. The terminal station is assigned to a group that includes the terminal station.

Information regarding the allocated call channel number and group number, that is, call channel designation information, is sent to the call channel designation information selection section 16.

The selection unit 16 stores the sent communication channel designation information in the memory area 18. As a result, the memory area 18 stores the call channel number and related information (
group number, call channel exclusive time, etc.) are stored together. The contents of the memory area 18 are updated with information on the call channel number and group number from the control unit 15 when there is a call request, so that it can be seen which call channel is assigned to which group. It is now possible to measure the exclusive time of a call channel.

The communication channel designation information in the memory area 18 is read out by the communication channel designation information selection section 16, sent to the control channel transmission section 14, and further transmitted to the terminal station via the control channel. The call channel designation information selection unit 16 changes the transmission frequency of each call channel designation information depending on the length of the exclusive elapsed time of the call channel assigned to the group including the terminal station that made the call request.

That is, the channel designation information transmission interval is made smaller for a group with a short elapsed time of exclusive use of a communication channel after a call is made, and the channel designation information transmission interval is made wider for a group with a long exclusive elapsed time.

The broadcast of the call channel designation information is as shown in FIG. 2, for example. In the same figure, S2 and "R" are designation information about the call channel in use, and it is assumed that sufficient time has passed since the call request was made and the call channel was allocated. It is broadcast repeatedly in the broadcast cycle.At times like this, call channel 1
Let's consider a case in which the control unit 15 also sends the number m to another group. Regarding the call channel designation information S regarding channel 1, the call channel designation information selection unit (", as shown in FIG. 2) is sent. Immediately after a call, the broadcasting cycle is shortened to send 1, and the broadcasting cycle is gradually lengthened, and when enough time has passed, the call channel number designation information is sent to the transmitter so that the broadcasting cycle is the same as S7 and S3. send.

As in the above example, by reducing the broadcast cycle of the call channel designation information immediately after a call is made, even if the terminal station fails to receive the first designation information, it does not wait until the terminal station receives the next designation information. in,
It is possible to switch to a conversation channel, thereby reducing the risk of failing to receive important information immediately after making a call.

Note that the present invention is applicable to all methods of specifying communication channels from a base station to each terminal station.

[Explanation of effects]

As explained above, according to the present invention, once a call channel is specified, each terminal station can quickly switch to the specified call channel, thereby reducing the risk of failing to receive important information immediately after making a call. Can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of a base station according to the present invention. FIG. 2 is a diagram explaining the cycle of transmitting call channel designation information. 12... Control channel receiving unit, 14... Control channel transmitting unit, 15... Control unit, 16... Call channel designation information selection unit, 18... Memory area. Patent applicant NEC Corporation

Claims (1)

[Claims] (1) Equipped with a plurality of groups each consisting of a plurality of terminal stations and a base station that manages communication of these plurality of groups, and communication within each of the above groups and communication between each of the above groups and the base station. using a control channel and multiple call channels for
Communication within each group is performed by the base station repeatedly broadcasting communication channel designation information including the designated communication channel via the control channel, and each terminal station of that group number switches to the designated communication channel. - In the channel group access method, the base station is equipped with means for measuring the elapsed time during which a call channel assigned to one group has been exclusively occupied by that group, and a means for measuring the broadcast interval of call channel designation information via the control channel. and means for controlling the broadcast to be broadcast at short intervals for a group with a short elapsed time of exclusive use of a voice channel measured by the above means, and at long intervals for a group whose elapsed time of exclusive use of a voice channel measured by the above means is long. A communication channel designation information broadcasting system for mobile radio communication characterized by: