JP2878237B2 - Method for notifying mobile station of incoming call in mobile communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for notifying an incoming call to a mobile station in a wireless communication system, and more particularly, to a method for notifying an incoming call to a mobile station in a digital mobile communication system using a multi-channel access system.

[0002]

2. Description of the Related Art Conventionally, this type of incoming call notification method has been proposed in a multi-channel digital mobile communication system, for example, as shown in the Public Service Digital Mobile Communication System Standard (RCR STD-39A) in September 1996. It is used to notify incoming calls to mobile stations using an access method.

FIG. 4 (a) is a diagram showing an example of the arrangement of each function channel on a control channel in the conventional receiving method.
As shown in FIG. 4A, a plurality of time-divided frames on the same radio frequency are collected to form one superframe, and control channel structure information and system information are broadcast to the mobile station in each superframe. Broadcast channel (B
CCH) 41 and a paging channel (PC) for designating a mobile station number and notifying that there is an incoming call request to the mobile station.
H) 42-1 to 42-n and a signaling channel (S) for transmitting call connection information such as communication channel designation information to a mobile station that has recognized that there is an incoming call request on the paging channel.
CCH) 43-1 to 43-m. Each of these channels is called a function channel, and the control channel is composed of these function channels. In addition, on a radio frequency having a control channel, a communication channel or the like in addition to the control channel may be time-division multiplexed and transmitted.

When notifying a mobile station of an incoming call request, if the number of the called mobile station is designated by the paging channels 42-1 to 42-n, the mobile stations are divided into a plurality of groups by a certain formula from the mobile station number. Distribute. That is, the mobile station number is divided by n of the total number of groups, and the mobile station is allocated to the group of the corresponding number with the remaining value (an integer of 0 to n-1). When an incoming call arrives at the first group of mobile stations, a mobile station number is designated from the paging channel (# 1PCH) 42-1 corresponding to the first group and an incoming call request notification is transmitted. Of the paging channels (# 2PCH) 42-2 to the mobile stations of the same group, and paging channels (#nPC) to the mobile stations of the n-th group.
H) Send an incoming request notification from 42-n.

FIG. 4B is a timing chart showing the state of the receiving operation of the mobile station corresponding to FIG. As shown in FIG. 4 (b), the mobile station calculates its own group number from its own mobile station number from the above-mentioned fixed formula, and simultaneously transmits an incoming call request notification to its own group. The reception operation is performed only during the transmission timing of the paging channel, that is, during the transmission timing 412 corresponding to the # 2 group in this example, and the reception operation is stopped at other times, thereby saving the battery of the mobile station. It is carried out. Note that the mobile station performs a receiving operation on the broadcast channel 41 as necessary.

[0006]

In the above-described conventional incoming call notification method, in the case of a mobile communication system which presupposes that a group incoming call is made to a mobile station group formed as one group over a plurality of groups, Alternatively, a paging signal for notifying the mobile station group that there is a group incoming call must be transmitted to at least a plurality of necessary paging channels, thereby increasing the communication traffic of the paging channel. Further, in order to cope with this problem, it is necessary to configure one group from a group of mobile stations belonging to the same group and to transmit a paging signal from only one paging channel. In this case, there is a restriction in assigning individual numbers to mobile stations and grouping, and this is inconvenient.

[0007] An object of the present invention is to provide a paging signal transmitted from a base station to a group of mobile stations when a group call is made to a group of mobile stations formed as one group over a plurality of groups. By allowing transmission only from the paging channel, there is no restriction on the individual number assignment and grouping to the mobile station, and the mobile station battery saving effect is increased without increasing the communication traffic of the paging channel. It is an object of the present invention to provide a method of notifying a mobile station of an incoming call in a mobile communication system without any loss.

[0008]

According to the method for notifying a mobile station of an incoming call in a mobile communication system according to the present invention, a control channel is composed of a combination of functional channels such as a broadcast channel, a paging channel and a signaling channel. Is a method for notifying a mobile station in a mobile communication system of digitally encoding each time-divided frame on a radio frequency having the control channel and transmitting the digitally coded frame from the radio base station to a plurality of mobile station groups. A paging channel is arranged on the control channel separately into a paging channel for individual reception and a paging channel for group reception. Also, the method for notifying a mobile station of a mobile communication system according to the present invention is characterized in that a paging signal for performing a group call from a radio base station is transmitted from the paging channel for group reception to a mobile station to be called. The receiving operation is performed only during the transmission timing of the individual paging channel for the group to which the mobile station belongs and the transmission timing of the paging channel for the group reception.

According to the present invention, the paging channel for individual reception and the paging channel for group reception are separately provided, and the paging signal for group reception is transmitted from the paging channel for group reception without discrimination of the group number. Only send. For this reason, even when a group call arrives at a mobile station that forms one group over a plurality of groups, it is only necessary to transmit a paging signal from the paging channel for group reception, and the communication traffic of the paging channel is minimal. There is no restriction in assigning individual numbers to mobile stations and grouping.

[0010] In addition to the reception operation of the mobile station at the transmission timing of the individual paging channel of the group to which the mobile station belongs by the conventional method, the mobile station also performs the reception operation of the group at the transmission timing of the paging channel. Since the receiving operation is performed, the receiving operation time ratio slightly increases and the effect of battery saving is reduced, but the effect is not significantly impaired.

[0011]

Next, embodiments of the present invention will be described with reference to the drawings.

Referring to FIG. 1, a mobile communication system to which the present invention is applied mainly includes a line control device 1 for mainly exchanging communication paths, and a base station device 2 for communicating with a mobile station via a radio line.
1, 2-2, 2-n and mobile stations 3-1, 3-2, 3-m
And the line control device 1 and the base station devices 2-1 to 2-1.
2-n is connected by a wired line. Further, a radio channel between each base station device and the mobile station has a control channel and a communication channel, and performs communication control by a multi-channel access method.

FIG. 2 is a block diagram of a control channel transmission signal processing in the base station apparatus shown in FIG. In the base station apparatus that has received the signal of the control channel to be transmitted from the line control device to the mobile station, the signal for the broadcast channel is transmitted to the broadcast channel signal coding unit 21 for each type of functional channel to be transmitted on the control channel. The paging channel signal for individual paging is sent to the paging channel signal coding unit 22 for individual paging, the paging channel signal for group reception is sent to the paging channel signal coding unit 23 for group reception, and the signal for the signaling channel is sent to the paging channel signal coding unit 23 for group reception. The signals are input to the signaling channel signal coding units 24 and are coded for wireless signal transmission.

The signals coded and output by the coding units 21 to 24 are once input to the transmission buffers 21a to 24a for each functional channel, and then sequentially taken by the control channel signal assembling unit 25 to be determined in advance. In accordance with the allocated frame of the functional channels, the functional channel signals are arranged in frame units to form a superframe, which is assembled as a control channel transmission signal. After that, this transmission signal is passed to the control channel transmission unit 26 and transmitted to the mobile station.

FIG. 3A is a diagram showing an example of the arrangement of each functional channel in a control channel 1 superframe according to the embodiment of the present invention. In FIG. 3A, a control channel includes a broadcast channel (BCCH) 31 for broadcasting control channel structure information and system information to a mobile station, and an incoming call request to the mobile station by designating a mobile station individual number. An individual paging channel (PCH) 32-1 to 32-n for each mobile station belonging group for notifying that there is a mobile station group number, and an incoming call request to the mobile station group belonging to the group by designating a mobile station group number. A group call paging channel (GPCH) 33 for notifying that there is a call, and a mobile station or a group of mobile stations that recognizes that there is an incoming call request in the individual call or group call paging channel. It has signaling channels (SCCH) 34-1 to 34-m for transmitting call connection information.

FIG. 3B is a timing chart showing the state of the receiving operation in the mobile station corresponding to the transmission timing of each function channel in FIG. 3A. FIG.
In (b), for example, when a certain mobile station belongs to the second group, the mobile station determines the transmission timing 312 of the paging call paging channel (# 2PCH) 32-2 for the second group mobile station. , Paging channel (GP
The reception operation is performed at the transmission timing 313 of the CH) 33 and the transmission timing 311 of the broadcast channel 31 as necessary. At other transmission timings, the mobile station has stopped the receiving operation.

Next, the operation of the embodiment of the present invention will be described with reference to FIGS. When calling a mobile station, each base station apparatus informs the mobile station to be called or a plurality of mobile stations having the same group number that there is an incoming call in the paging channel which is a function channel on the control channel. A paging signal indicating a mobile station number or a group number for notification is transmitted. When a mobile station is individually called, the group number to which the mobile station belongs is determined from the mobile station number of the mobile station to be called by a constant calculation formula similar to the method described in the background art. In the example, the paging signal is assumed to be calculated as the second group), and a paging signal is transmitted from the second group dedicated paging channel (# 2PCH) 32-2 corresponding to the group number 2 in the control channel. When calling a plurality of mobile stations having the same group number, a paging channel for group reception (GPC
H) Send a paging signal from 33.

According to the above-described operation, even if a plurality of mobile stations having the same group number exist in different groups, the paging signal is transmitted to all the mobile stations for individual reception in order to notify the mobile stations in each group of the group reception. It is not necessary to transmit from the paging channel, but only from the paging channel for group reception. As a result, the paging channel as a whole for individual and group
Communication traffic for group calls can be minimized.

Therefore, in order to avoid an increase in the communication traffic of the paging channel as in the conventional paging notification method, a paging signal for group paging needs to be transmitted only from the paging channel for individual paging in any one group. As described above, it is not necessary to configure the mobile stations constituting one group to have the same group of mobile station numbers, and there is no restriction on the numbering plan such as the individual number assignment of mobile stations and the group configuration.

As shown in FIG. 3 (b), the mobile station calculates the group number to which the mobile station belongs according to a certain formula from the mobile station number as shown in FIG.
The paging channel for individual reception for the group, in this example, the paging channel for individual reception (# 2PCH) 3 for the second group
The receiver is started up and the receiving operation is performed only during the transmission timing 312 of 2-2 and the transmission timing 313 of the paging channel for group reception. During the transmission timing 311 of the broadcast channel, a reception operation is performed as necessary, similarly to the conventional method.

As a result, as compared with the conventional method, the reception operation is performed during the transmission timing of the paging channel for group reception, the reception operation time ratio of the receiver of the mobile station is increased, and the battery saving effect is somewhat reduced. However, this does not significantly impair the overall battery saving effect.

[0022]

As described above, according to the present invention, the first effect is that communication traffic of the entire paging channel is required even when a plurality of mobile stations constituting a group belong to a plurality of groups. It is possible to perform a group call to a plurality of mobile stations without increasing the number and without significantly impairing the effect of the battery saving operation of the mobile station. The reason is that the paging channel on the control channel wirelessly transmitted from the base station is divided into a paging channel for individual paging and a paging channel for group paging, and a paging signal at the time of group paging is transmitted to the target mobile station. This is because the transmission is performed from the paging channel for group reception so that the user does not have to be aware of the belonging group.

A second effect is that assignment of individual numbers to mobile stations and grouping of mobile stations can be performed without being aware of the group numbers of mobile stations. The reason for this is that, similarly to the reason for the first effect, the paging signal at the time of group calling is transmitted from the group call paging channel which can be transmitted without being conscious of the group to which the called mobile station belongs. is there.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration example of a system to which a method of notifying a mobile station of an incoming call in a mobile communication system according to the present invention.

FIG. 2 is a block diagram illustrating a transmission signal processing of a control channel in the base station apparatus of FIG. 1;

FIG. 3A shows a control channel 1 according to the embodiment of the present invention.
FIG. 3 is a diagram illustrating an example of the arrangement of each function channel in a superframe. (B) is a timing chart showing the state of the receiving operation of the mobile station corresponding to the transmission timing of each functional channel of (a).

FIG. 4A shows a control channel 1 of the conventional incoming call notification method.
FIG. 3 is a diagram illustrating an example of the arrangement of each function channel in a superframe. (B) is a timing chart showing the state of the receiving operation of the mobile station corresponding to the transmission timing of each functional channel of (a).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Circuit control device 2-1 to 2-n Base station device 3-1 to 3-m Mobile station 21 Broadcast channel signal coding unit 22 Broadcast channel signal coding unit for individual reception 23 Broadcast channel signal coding unit for group reception 24 Signaling channel signal coding units 21a to 24a Transmission buffer 25 Control channel signal assembling unit 26 Control channel transmitting unit

Claims (2)

(57) [Claims] 1. A control channel comprising a combination of function channels such as a broadcast channel, a paging channel, and a signaling channel, wherein these function channels are digitally encoded for each time-divided frame on a radio frequency having the control channel. In the method of notifying a mobile station in a mobile communication system that a plurality of mobile stations are transmitted from a radio base station to a plurality of mobile stations, the paging channel is controlled on the control channel by a paging channel for individual reception and a paging for group reception. A method of notifying a mobile station of an incoming call in a mobile communication system, wherein the method is arranged separately from a paging channel. 2. A paging signal for performing a group call from a radio base station is transmitted from the paging channel for group reception, and a paging signal for individual reception dedicated to the group to which the mobile station belongs is called to the mobile station to be called. 2. The method according to claim 1, wherein the receiving operation is performed only during the transmission timing of the channel and the transmission timing of the paging channel for group reception.