JP2878207B2 - 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 mobile communication system for realizing wireless communication by a mobile terminal such as a portable telephone by using a plurality of wireless base stations and a switching device. The present invention relates to a mobile communication system in which an incoming error is reduced and a time until an incoming call notification is shortened.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication No. Hei 4-239827 discloses that a connection device (switching device) is provided with a priority order circuit for setting a use order when a radio control channel is used when an incoming call is received. A cordless button telephone system that avoids collisions due to simultaneous transmission of incoming signals by automatically determining the order of use of the same radio control channel when it is necessary to use the same at the same time. In this system, the switching device does not set the priority of the incoming signal for each wireless base station, only transmits the incoming signals in the order of occurrence of incoming calls, and when the wireless base station receives the incoming signals from the switching device, in the order received, It simply sends the incoming signal to the mobile phone.

[0003]

However, this conventional technique only instructs a plurality of radio base stations to transmit incoming signals in the order in which the switching device detects the incoming call, and transmits the incoming signal to a radio base station where the portable telephone is not waiting. When an invalid incoming signal transmission instruction is sent and multiple incoming calls occur almost simultaneously, the incoming signal
The transmission is put on hold by the use priority of the control channel in the radio base station, and as a result, transmission of the target incoming signal is delayed, and there is a problem that the incoming display of the mobile phone is delayed.

That is, in the so-called second-generation cordless telephone system, the radio base stations are grouped by the calling area, and the position management of the portable telephone is performed for each calling area.
Since the mobile phone cannot identify the wireless base station waiting, when an incoming call occurs, the mobile phone will transmit an incoming signal equally to all of the wireless base stations belonging to the calling area where the location of the mobile phone is registered. It is. Further, in the second generation cordless telephone system, the timing at which an incoming signal can be transmitted is limited. Therefore, when the incoming signal is congested, signal transmission is delayed, and in many cases, a response cannot be made due to time-out on the network side.

SUMMARY OF THE INVENTION It is an object of the present invention to make it possible to promptly notify an incoming call to a mobile terminal when an incoming call is detected by a switching device.

[0006]

According to the mobile communication system of the present invention, the mobile station stores the last used radio base station for location registration, outgoing call, incoming call response, etc. in the switching device, and the mobile terminal receives the incoming call. When an error occurs, the wireless base station instructs to transmit the incoming signal preferentially to the last used wireless base station.If there is an incoming signal in the transmission hold state, the wireless base station changes the transmission order and is instructed. The incoming call signal is preferentially transmitted to the mobile terminal.

That is, according to the present invention, the switching device stores the identification information of the wireless base station used last by the mobile terminal, and at the time of an incoming call, retrieves the identification information of the wireless base station from the storage means. A priority transmission instruction for determining whether transmission of an incoming signal to all the radio base stations has been completed, and if not, instructing the last radio base station used by the mobile terminal to give priority to the transmission of the incoming signal; Means.

When the radio base station receives the priority incoming signal from the switching device, it determines whether there is an incoming signal waiting to be transmitted, and if so, gives the incoming signal a priority so as to give priority to the priority incoming signal. An incoming signal transmission order changing unit that sets a priority incoming signal to the mobile terminal by setting it at the head of the transmission queue and, if not, sets the received incoming signal in a normal queue and transmits it to the mobile terminal. It is characterized by having.

[0009]

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

FIG. 1 shows a configuration example of a mobile communication system according to the present invention. This system is composed of a plurality of (two shown) wireless base stations 1 and 2, a mobile phone 3, and a switching device 4 for connecting the wireless base stations 1 and 2. The switching device 4 searches the storage unit 5 for storing the identification information of the wireless base station 1 or 2 used last by the mobile phone 3 and the identification information of the wireless base station from the storage unit 5 when an incoming call is received. A priority transmission instructing unit 6 for instructing the base station 1 or 2 to give priority to the transmission of the incoming signal. Each of the wireless base stations 1 and 2 has an incoming signal transmission order changing unit 7 that changes the order of transmission of incoming signals in accordance with an instruction from the priority transmission instruction unit 6 of the switching device 4.

Next, the operation will be described with reference to the flowcharts of FIGS. Now, when the mobile phone 3 uses the wireless base station 2 to perform a telephone call or location registration, the switching device 4 transmits the identification information of the mobile phone 3 and a call request from the wireless base station 2 in step S1 in FIG. It receives a location registration request and an incoming call response signal. Then, in the next step S2, the switching device 4 stores the identification information of the wireless base station that has transmitted the information from the mobile phone 3, that is, the identification information of the wireless base station 2 that the mobile phone 3 used last. 5 is stored in a location corresponding to the mobile phone 3.

In step S11 of FIG.
Upon detecting the incoming call, the priority transmission instructing unit 6 of the switching device 4 searches the storage unit 5 for the identification information of the wireless base station used last by the destination mobile phone 3 in the next step S12. In the next step S13, it is determined whether or not the transmission of the incoming signal to all the wireless base stations has been completed. If not, the process proceeds to step S14 to determine whether or not the wireless base station has been searched. If it is the searched wireless base station, the flow advances to step S15 to instruct the wireless base station to give priority to the transmission of the incoming signal, that is, transmit the priority incoming signal. On the other hand, if the wireless base station is not the searched wireless base station, the process proceeds to step S16, and the normal incoming signal transmission is instructed to the wireless base station. Step S15 and step S16 are followed by step S
Return to 13. When the transmission of the incoming signal to all the wireless base stations is completed in step S13, the process ends.

FIG. 4 shows the processing on the radio base stations 1 and 2 side.
Upon receiving the priority incoming signal from the switching device 4 in step S21, the incoming signal transmission order changing unit 7 proceeds to step S2.
It is determined in step 2 whether there is an incoming signal waiting to be transmitted, and if so, the received incoming signal (priority incoming signal) is set at the top of the incoming signal transmission queue so that the incoming signal is prioritized. If there is no such signal, the received incoming signal is set in a normal matrix. The mobile phone 3 that has received the incoming call signal notifies the incoming call by display means or voice means.

[0014]

As described above, according to the present invention, the mobile station stores the last used radio base station for location registration, outgoing call, incoming call response, and the like in the switching device, and the mobile terminal receives a call. At this time, since the last used radio base station is instructed to transmit the incoming signal preferentially, the radio base station:
When there is an incoming signal in the transmission hold state, the transmission order can be changed and the instructed incoming signal can be preferentially transmitted to the mobile terminal, so that the incoming notification to the mobile terminal can be promptly performed.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration example of a mobile communication system according to the present invention.

FIG. 2 is a flowchart showing a process in an exchange device when information from a mobile phone is received via a wireless base station in FIG. 1;

FIG. 3 is a flowchart showing a process in the switching device when an incoming signal is received from a wireless base station.

FIG. 4 is a flowchart illustrating a process performed by the wireless base station when an incoming signal is received from the switching device.

[Explanation of symbols]

 1.2 Wireless base station 3 Mobile phone 4 Switching device 5 Storage unit 6 Priority transmission instruction unit 7 Incoming signal transmission order change unit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04B 7/24-7/26 H04Q 7/00-7/38

Claims (1)

(57) [Claims] 1. A mobile communication system comprising a mobile terminal, a plurality of radio base stations for performing radio communication between the mobile terminals, and a switching device connecting the radio base stations, wherein the switching device includes a mobile terminal. Storage means for storing identification information of the last used radio base station; and, upon receiving a call, retrieving the identification information of the radio base station from the storage means and determining whether or not transmission of an incoming signal to all the radio base stations has been completed. Determination, if not completed, the mobile terminal comprises priority transmission instructing means for instructing the wireless base station used last to give priority to the incoming signal transmission, the wireless base station, from the switching device When a priority incoming signal is received, it is determined whether there is an incoming signal waiting to be transmitted, and if so, the priority incoming signal is set at the top of the incoming signal transmission queue so that the priority incoming signal is prioritized. The move If the transmitted, without end, the mobile communication system which sets a call signal received on the matrix as usual, characterized by comprising an incoming signal transmission priority changing means for transmitting to the mobile terminal.