JPH0683134B2 - Mobile wireless communication method - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a mobile radio communication system suitable for non-telephone type mobile radio communication that switches radio zones in accordance with movement of a mobile device.

[Background of the Invention]

Conventionally, mobile radio communication systems include car telephones, ship telephones, and the like. However, since these are all intended for telephone use, switching between the zones due to movement of the mobile device is at most 1
Since this is about a second, the adverse effect of the instantaneous interruption of communication due to this is not a serious problem.

However, in the case of data communication, the lack of data due to the instantaneous interruption of the time is fatal, and there is a drawback that the conventional mobile radio communication system cannot perform data communication.

In view of such drawbacks, conventionally, there has been proposed a method in which an image signal is temporarily stored in a shift register during a channel switching period during communication, and communication of the image signal is restarted via the shift register when the call channel switching is completed. ing.

However, no particular consideration was given to the communication protocol, etc., and the communication reliability was not satisfactory.

[Object of the Invention]

An object of the present invention is to eliminate the above-mentioned drawbacks of the conventional method and provide a highly reliable mobile radio communication method that is not affected by a momentary interruption.

[Outline of Invention]

The present invention relates to a mobile radio communication system in which communication data is temporarily stored in a communication data storage memory when a wireless communication path is switched, and the stored data in the memory is transmitted / received after the switching is completed. In response to the communication interruption notification, from the mobile unit to the mobile radio communication network side, a step of transmitting an acknowledgment signal of the communication interruption, and after the switching processing is completed, from the mobile radio communication network side Responding to a communication restart notification to the mobile device, transmitting a communication restart acknowledgment signal from the mobile device to the mobile radio communication network side; and responding to the acknowledgment signal, the mobile device and the mobile wireless device. A step of restarting communication with the communication network; and a step of executing transmission / reception of communication data stored in the storage memory when the communication is restarted. One in which the.

Example of Invention

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a system diagram of a mobile radio communication system according to the present invention. In the figure, the mobile radio communication network selects the radio base stations (MBS) 11 and 12 that directly communicate with the mobile device (MSS) 5, the antennas 13 and 14, the MBS closest to the MSS, and the radio channel owned by the MBS. It is composed of a line controller (MCS) 15 for selecting one of the channels and a mobile switching center (AMC) 10 having a switching connection function. Now, it is assumed that the mobile device (MSS) 5 is communicating with the wireless base station (MBS1) while moving. The MSS controls the wireless communication with the data device 3 that handles the data, the data processing device (CPM) 1 that processes the communication data of the data device 3, the buffer memory (BM) 2 that temporarily stores the communication data, and the MBS. It is composed of a communication control unit (CCE) 4. When data is transmitted from the MSS to the network, a wireless communication channel between the MSS and MBS1 is established by CCE and connected to the mobile switching center (AMC) 10 via the line controller (MCS) 15. . This communication path establishing process is a well-known technique for automobile telephones and the like, and is not a constituent part of the present invention, and therefore its explanation is omitted.

When the communication path is established, the communication data output from the data device 3 is directly transmitted by the CPM (1) to the MBS (11) without passing through the BM (2).

However, if the MSS (5) moves during communication and switches the wireless zone from the MBS1 (11) zone to the MBS2 (12) zone, the communication is interrupted and the CPM (1) transmits data to the BM.
After buffering to (2), after restarting the zone, communication is restarted, data is taken out from BM (2) and sent to MBS (12). This process will be described with reference to FIG.

During the communication between MSS (5) and MBS1 (11), when the zone switching of MSS (5) is detected by MBS1 (11) by the existing technology, the zone switching is notified to MCS (15), MCS
(15) also notifies AMC (10) of zone switching. The AMC (10) sends a communication interruption notification to the CPM (1), the CPM (1) sends an acknowledgment signal to the AMC (10), and the AMC (10) receives both of them at the time of reception. Communication is interrupted.

When the CPM (1) receives the communication interruption notification, the CPM (1) starts accumulating the communication data, which has been transmitted to the MBS1 (11) directly through the CCE (4), in the BM (2). The switching process on the communication network side is performed while the CPM (1) is accumulating communication data.
AMC (10), MCS (15), MBS1 when switching destination MBS is determined
(11) and the switching destination MBS2 (12) is instructed to switch (,,), MBS1 (11) instructs MSC (5) CCE (4) to switch, and when these are completed (,,,)
), Communication is resumed (,). When the communication is restarted, CPM (1) takes out the data accumulated in BM (2) during this period and transmits it via CCE (4). When all the data in BM (2) is taken out, BM ( Return to the original direct communication performed through 2).

If the data device on the called side is installed in the mobile device, the interruption also occurs by switching the zone on the called side.
In this case also, as in the above case, the AMC notifies the MSS on the transmitting side of the interruption, and the CPM on the transmitting side performs buffering by the BM.

If the AMC of the receiving side is different from the AMC of the transmitting side, the receiving side AMC notifies the transmitting side AMC of the zone switching of the receiving side, and the transmitting side AMC notifies the MSS of communication interruption, and the zone switching It is necessary to notify the end even at the end. However, other than that, it is the same as the method described in the above example.

As described above, the buffer memory and the data processing device are installed in the mobile device, and the data is accumulated at the time of zone switching, so that the influence of the instantaneous interruption of the communication can be eliminated and the highly reliable mobile wireless communication can be performed. .

〔The invention's effect〕

According to the present invention, in mobile wireless communication, loss of communication data due to communication interruption due to switching of a wireless zone due to movement of a mobile device can be eliminated, and highly reliable data communication can be performed.

Further, the present invention is directed to the mobile wireless communication network side from the mobile device to the mobile wireless communication network side during the temporary storage operation of the communication data in the memory when the communication between the mobile device side and the mobile wireless communication network side is interrupted. Since the acknowledgment signal is transmitted in response to each of the communication interruption notification and the communication restart notification from the side, the communication interruption and the communication restart are ensured, so if the acknowledgment signal is not transmitted again, By issuing a communication interruption notification and a communication restart notification from the mobile radio communication network side,
The communication interruption and the communication restart can be executed, the communication data during this time can be surely stored in the memory, and the lack thereof can be eliminated. Further, as in the present invention, the line control device of the communication network issues a switching instruction to both the current communication side wireless base station and the wireless base station to be switched from now on, and the communication control device of the mobile unit communicates. A switching completion notification is sent from the wireless base station to the line control device to the wireless base station on the current communication side of the network, and the switching completion is sent from the wireless base station on the switching side to the line control device when the switching is completed. That is, while the communication data is being stored in the storage memory, a channel switching instruction is executed to both base stations in parallel, and in response to this, both base stations notify the line control device of the communication network of switching completion. With such a method, channel switching can be performed quickly, the amount of interruption signals stored in the storage memory at the time of channel switching can be reduced, and the retransmission time at the time of retransmission can be made efficient. Further, according to the present invention, even if data is lost due to a time delay until the mobile unit on the calling side is actually stopped, the data can be traced back to where the communication transmission / reception confirmation cannot be obtained. It is also possible to put an instruction as to whether or not to re-send in the communication resumption notification signal, which makes it easy to resynchronize the data transfer between the originating and terminating terminals after switching the communication channel. Therefore, it is possible to reliably and satisfactorily perform digital communication.

[Brief description of drawings]

FIG. 1 is a device configuration diagram of a mobile radio communication system for performing data buffering according to the present invention, and FIG. 2 is a diagram showing a zone switching sequence in FIG. 1: Data processing device (CPM) 2: Buffer memory (BM) 3: Data device 4: Communication control device (CCE) 5: Mobile device (MSS) 6, 13, 14: Antenna 10: Mobile switching center (AMC) 11 , 12: Wireless base station (MBS1,2) 15: Line control device (MCS)

Claims (1)

[Claims] 1. A mobile radio communication network including first and second radio base stations (11, 12), a line control device (15) and a mobile switching center (10), a communication data storage memory (2), A mobile device (5) including a communication control device (4), wherein the mobile wireless communication network and the mobile device (5) are connected by a wireless communication path (f1) via a first wireless base station (11). Connected, the mobile unit (5)
Wireless communication via the second wireless base station (12) with the movement from the unit wireless area which is the range within which the first wireless base station (11) in communication with the other wireless unit is communicating. In the mobile radio communication system, the communication path (f2) is switched, the communication data is temporarily stored in the communication data storage memory (2) at the time of the switching, and the stored data in the memory is transmitted and received after the switching is completed. A step of making a communication interruption notification from the mobile switching center (10) of the mobile radio communication network to the mobile device (5) at the time of switching the radio communication path via the radio base station (11), and responding to the communication interruption notification And transmitting the communication interruption approval signal from the mobile device (5) to the mobile switching center (10) of the mobile radio communication network; and in response to the approval signal, the mobile radio communication network Mobile switching center (10 From the line control device (15) to the first and second radio base stations (11, 12) in response to the switching instruction. Issuing an instruction, and a step of issuing a switching instruction from the first wireless base station (11) to the mobile device (5) in response to the switching instruction to the first wireless base station (11). And, in response to a switching instruction to the mobile device (5), a communication completion notification from the communication control device (4) of the mobile device (5) to the first radio base station (11). Receiving the notification of the completion of switching, the first wireless base station (11) sends a switching notification to the line control device (15), and the first wireless base station (11) sends the second wireless communication. When switching to the base station (12) is executed, the line control is performed from the second radio base station (12). A switch completion notification to the storage unit (15), a step of temporarily storing the communication data in the communication interrupted immediately after the communication interrupt notification is received in the storage memory (2), and after the switching processing is completed, A step of issuing a communication restart notification from the mobile switching center (10) of the mobile wireless communication network to the mobile device (5); and a step of responding to the communication restart notification from the mobile device (5) to the mobile wireless communication network. Transmitting to the mobile switching center (10) an acknowledgment signal for restarting communication, and in response to the acknowledgment signal, the mobile station (5) and the second wireless base station (12) of the mobile wireless communication network. Communication between the storage memory (2) and the communication data stored in the storage memory (2) when the communication is restarted. While accumulating A wireless communication path switching instruction is transmitted to the first and second wireless base stations (11, 12), and when the switching is completed, the wireless communication is performed from the first and second wireless base stations (11, 12). A mobile radio communication method, characterized in that a switching completion signal indicating completion of switching is transmitted to a network line control device (15).