JPH0418896A - Radio zone switching method during communication - Google Patents

Abstract

PURPOSE:To efficiently deal with various kinds of data transferring frequencies by transmitting data to be transmitted from a network to a mobile machine during communication to a base station stored beforehand in an intra-network memory, and paging the mobile machine for all the base stations in a position registration area if no answer is returned. CONSTITUTION:The mobile machine 4 does not inform the network of its movement even if it moves within radio zones 1-1 to 1-8 in the same position registration area, and on the other hand, when it moves to the radio zone in the different position registration area 3-1, 3-2, the network is informed of the change of the position registration area 3-1, 3-2, and the data is transmitted to the mobile machine 4 through the base station 2-1 to 2-8 through which the data or a control signal from the mobile machine 4 to the network passed lastly. When the confirmation of reception is not returned for plural number of times of data transmission, all the base stations 2-1 to 2-8 in the position registration area 3-1, 3-2 in which the mobile machine 4 is registered page the mobile machine 4, and the data is transmitted again through the base station 2-1 to 2-8 having received the answer. Thus, various kinds of the data transferring frequencies can be efficiently dealt with.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data transfer method in a mobile communication system using wireless packet communication, and particularly relates to a method for switching wireless zones without interrupting pig transfer.

2. Conventional technology: Data transfer methods in mobile communications include a method using a circuit switching service in which a single line is exclusively used to send and receive data while a single mobile device is communicating with the network; There is a method of sharing and using one line.

In wireless packet communication, each data consists of a packet, and the header of the packet data contains an identifier (identifier) that identifies which terminal the data is sent to the network from, and which terminal the data is sent from the network to. This is a type of communication in which data is sent and received using a shared line by using a shared line (address).

The wireless zone provides a communication channel for mobile devices,
When a mobile device moves from one wireless zone to another during communication, procedures are required to ensure that data transfer continues.

With circuit switching, when a mobile device moves from one wireless zone to another during communication, it notifies the network of the wireless zone change, carries out procedures to change the communication channel, and sets up a dedicated line between the terminal and the network to transfer data. Continue the transfer.

In addition, when transferring signals when the mobile device is not communicating with the network using a circuit-switched service, the network does not know in which wireless zone the mobile device is located, and all base stations within the location registration area A mobile device is called and data is transferred via the base station that receives a response from the mobile device.

Conventionally, as a method for continuing data transfer when a communicating mobile device changes the zone during wireless packet data transfer, ■ The method used during communication in circuit switching is also applied to packet data transfer, and packet data transfer to be sent during communication is performed. Even if the mobile device does not have a wireless zone, if the mobile device moves between wireless zones, the wireless zone is updated and the wireless zone is always fixed at the time of data transfer. There was a method that was also applied to packet data transfers, in which wireless zones were not updated even during communication, and call processing was performed in multiple W-line zones for each data transfer to establish wireless zones.

[Problems to be Solved by the Invention] Wireless packet communication is a communication system suitable for providing computer communication to mobile terminals having burst traffic.

In wireless packet communications, as a method for continuation of packet data due to zone movement during communication, the latest wireless zone is memorized during communication and the wireless zone is moved, as shown in (■) in the conventional technology section. If a method is applied in which the wireless zone is updated accordingly, even if the terminal and the network are communicating, if the frequency of packet data transfer is low, the wireless zone will be changed slowly without data transfer.

Therefore, in this case, even when there is no packet data to actually be transferred, procedures necessary for updating the wireless zone are required, resulting in poor line usage efficiency.

In addition, as shown in ■, the method that does not update the wireless zone during communication has the opposite effect, when the mobile device moves between wireless zones when the data transfer frequency is high and the data transfer is slow in the same wireless zone. Even if there is no such system, the mobile device must call all the base stations within the location registration area, resulting in poor efficiency.

Therefore, in the conventional technology for continuous packet data transfer methods for communication middle-class lines, there are cases in which efficiency is poor depending on the data transfer frequency when using either method. Since it is necessary to have two types of procedures, it has the disadvantage that control becomes complicated.

SUMMARY OF THE INVENTION An object of the present invention is to provide means that can effectively deal with various data transfer frequencies using a unified procedure.

, Means for Solving the Problems] The present invention has been accomplished in order to solve the conventional problems as described above and achieve the above objects, and is configured as follows.

That is, the present invention provides a mobile communication system in which a location registration area is configured by at least one wireless zone, and a mobile device transfers data to a network via a base station installed in each wireless zone. Even if you move to a different wireless zone, you will not notify the network that you have moved;
When the mobile device moves to a wireless zone with a different location registration area, the network is notified of the change in the location registration area according to a predetermined procedure, and while the network and the mobile device are communicating, the network receives data or control from the mobile device to the network. Data is transmitted to the mobile device via the base station through which the signal last passed, and if there is no reception or acknowledgment of data transmission once or multiple times including retransmissions, the location where the mobile device is registered. This is a communications middle-aged line zone switching method in which all base stations within a registered area call a mobile device, and data is retransmitted via the base station from which the mobile device responds.

A method is adopted in which the mobile device is sent to a base station, and if there is no response from the mobile device from the base station, the mobile device is called again to all base stations within the location registration area. Therefore, if the data transfer frequency is low, the wireless zone update procedure can be omitted, and if the data transfer frequency is high, the call control can be omitted.

On the other hand, the conventional technology can cope well with either low or high data transfer frequency, but cannot efficiently cope with both cases.

[Function] According to the present invention, when a mobile device moves from one wireless zone to another within the same location registration area during communication, the wireless zone is not updated, and the base station that last communicated with the mobile device is stored in the network memory. Its main feature is to memorize information.

In the present invention, during communication, data transmitted from the network to the mobile device is stored in advance in the network memory.
1 to 1-8 are wireless zones, and 2-1 to 2-8 are wireless zones 1-1 to 1-8 when the mobile device transfers data with the network device 5 when the mobile device exists in each wireless zone 1-1 to 1-8. Base station via
Reference numerals 3-1 and 3-2 represent a location registration area constituted by a wireless zone, 4 a mobile device, and 5 an in-network device having a memory 6.

Figures 2, 3, 1, and 4 show the base stations that the mobile device can actually communicate with and the communication with the mobile device stored in the network when the mobile device moves between wireless zones during communication. Focusing on possible base stations, this figure provides an overview of the operations of the mobile device and the network, as well as the states of the memory within the mobile device and the network.

Below, using Figure 2, when the mobile device and the network are communicating, the mobile device 4
moves from wireless zone 14 to 13 within the same location registration, then moves I! ! When data is transferred from the mobile device 4 to the network device 5, the network recognizes the change in the wireless zone based on the packet data transmitted from the mobile device 4,
The operation when packet data transfer is continued will be explained.

In FIG. 2, It-17 is a packet data and a data reception confirmation packet between the mobile device 4 and the network device 5. 21.22 is the state of the memory in the mobile device 4 that stores base stations with which the mobile device 4 can communicate, and 31.3
2 is the state of the memory within the network device 5 that stores base stations with which the mobile device 4 can communicate.

Packet data and data reception confirmation packet IL
12.13.14, the mobile device 4 and the network device 5 perform a predetermined call procedure for wireless packet data transfer;
(Indicates that the mobile device 4 is transmitting and receiving data via the base station 2-4 in the wireless zone 1-4 in which the mobile device 4 exists, using the packet communication channel set by obtaining the incoming call procedure.) Ru.

In this procedure, a reception confirmation signal is transmitted for the received data. At this time, the mobile device internal memory state 21 and the network memory state 31 both indicate that the mobile device 4 can communicate with the base station 2-4. Mobile device 4 is in wireless zone 1
-4 to wireless zone 1-3 in the same location registration area, the base station with which the mobile device can communicate with the network device 5 changes from base station 2-4 to base station 2-3. The mobile device 4 changes the memory state t121 in the mobile device 4, which has so far indicated that it is capable of communicating with the base station 2-4, to a state 22 in which it can communicate with the base station 2-3. At this time, no special processing is performed on the network device 5, and no wireless zone change procedure is performed from the mobile device to the network.

Therefore, the state of the memory 6 of the network device 5 remains in state 31. Mobile device 4 performs packet data transfer 15 to in-network device 5 using a new communication channel provided by wireless zone 1-3 after moving.

Here, the network device 5 recognizes that the base station through which the packet data 15 has passed has changed from 2-4 to 2-3, and moves the network memory state F! The state changes to state 32 indicating that I4 is capable of communicating with the base station 2-3.

Since the packet data transmitted from the network device 5 to the mobile device 4 is always transmitted to the base station with which communication is possible, which is indicated by the network memory 6, the reception confirmation packet 16 for the packet data 15 is Memory-like! It is transmitted to the mobile device 4 via the base station 2-3 in accordance with s32.

Through the above procedure, data transfer can be continued even after changing the wireless zone during communication by the mobile device 4 without using a wireless zone changing procedure like circuit switching.

Next, using FIG. 3, when the mobile device 4 and the network device 5 are communicating,
When the mobile device 4 moves from wireless zone 1-4 to wireless zone 1-3 within the same location registration area and first transfers packet data from the network device 5 to the mobile device 4, the network An example will be described in which data transfer is continued by calling the mobile device from a base station to all base stations within the location registration area and retransmitting packet data to the base station that responded.

In FIG. 3, reference numeral 11 indicates data that the in-network device 5 transfers to the mobile device 4 through the base station 2-4, and 12 indicates data that the in-network device 5 transfers to the mobile device 4 via the base station 2-4. A call from the mobile device 4 transmitted to all base stations, 13 is a response from the mobile ff14 to the call, 14 is data 1
1 retransmission data is shown. Further, 21.22 is the state of a memory in the mobile device 4 that stores base stations with which the mobile device 4 can communicate, and 31.32 is a memory that stores base stations with which the mobile device 4 can communicate. This is the state of 6.

The mobile device 4 and the network device 5 use a packet communication channel set by obtaining a call origination procedure and a call reception procedure for predetermined wireless packet data transfer to the wireless zone 1- in which the mobile device 4 is present. Data is transmitted and received via the base station 2-4 within the base station 4.

Here, the mobile device memory state 21, the network memory state 31,
Both indicate that the mobile device 4 can communicate with the base station 2-4. When mobile 1bta4 moves from wireless zone I-4 to wireless zone L-3, mobile device 4 recognizes the wireless zone movement due to the deterioration of the reception level and searches for broadcast information from base stations within the location registration area. , recognizes that it has moved to a new wireless zone 1-3.

The memory state 21 in the mobile device 4, which had previously indicated that it is capable of communicating with the base station 2-4, is changed to the state 22 in which it can communicate with the base station 2-3, but special processing is required for the network. Don't do it. The state of this dog's memory 6 remains in state 31.

When transferring packet data from the network device 5 to the mobile device 4, the network device 5 transfers the data according to the state 31 of the memory 6), so the packet data 11 is transferred via the base station 2-4. Forward.

However, since the mobile device 4 has already moved to the wireless zone 13 at this point, it is unable to receive the packet data 11.

Furthermore, when the predetermined data reception confirmation waiting timer times out, the network device 5
- All base stations within 1 21.1-2.2-3.2-4
The mobile device 4's paging data I2 is sent to the mobile device 4 using a broadcast channel used for mobile device paging.

Mobile device 4, which has received paging data 12 via base station 2-3, transfers response signal packet 13 via base station 2-3 using a response channel for the paging.

The network device 5 receives the response packet 13, and since the response packet 13 has passed through the base station 2-3, the memory 6
The state is changed to state 32, which indicates that the mobile device 4 can communicate with the base station 2-4. Subsequent retransmission data, new data, confirmations, etc. are transferred via the base station 23 according to the state 32 of the memory 6 using the packet communication channel.

During packet communication between the mobile device 4 and the network device 5, if the mobile device 4 moves from the wireless zone 1-4 to the wireless zone 15 and from the location registration area 3-1 to the location registration area 3-2, the mobile device 4 After moving, if there is data transfer before the network,
The network device 5 does not send data to the base station through which the last signal sent from the mobile device passed, but directly sends packet data to the base station through which the signal used for the location registration procedure passed. packet data transfer continues even after the transfer.

In FIG. 4, 11 is a movement l! ! 12 is a response to the location registration area change notification 11 transferred from the network device 5 to the mobile device 4, and 13 is a response from the network device 5 to the mobile device 4. This is the data to be sent to.

21 and 22 are memory states in the mobile device storing base stations with which the mobile device 4 can communicate, and 31 and 32 are the states of the mobile device 4
represents the state of the network memory 6 that stores base stations with which communication is possible.

The mobile device 4 and the in-network device 5 use a packet communication channel set through a predetermined call origination procedure and call reception procedure for wireless packet data transfer to the wireless zone 1-4 where the mobile device 4 exists. Data is transmitted and received via the base station 2-4 within.

Here, the mobile device memory state 21, the network memory state 31,
Both indicate that the mobile device 4 can communicate with the base station 2-4. When the mobile device 4 moves from wireless zone 1-4 to wireless zone 1-5 with a different location registration area, and moves from the location registration area 31 to 3-2, the mobile device uses a predetermined channel to access the network. The location registration area change procedure 11 is transferred to the location registration area change procedure 11, and the location registration change procedure is performed according to the procedure.

Due to the location registration change procedure, the mobile FFI 4 has previously indicated that it can communicate with the base station 2-4.
state 2 in which the memory state 21 in the memory state 2 can be communicated with the base station 2-5
Set it to 2. The network device 5 that has received the location registration area change notification recognizes that the mobile device 4 has moved from the location registration area 31 to the location registration area 32, and updates the state of the network memory 6 to the location registration area change notification 11. A state 32 is established in which communication is possible with the base station 2-5 through which the terminal passed. Subsequent responses 1
6. Transmission data 17 and new data, confirmations, etc. are transferred using the packet channel via the base station 23 according to the network memory status 32.

In this method, when data is transferred from the network to the mobile device during communication, the time interval since the last data transfer, confirmation, procedure, etc. performed from the mobile device to the network has exceeded the specified value. If the number exceeds the number, a method can be added in which the mobile device calls all base stations within the location registration area without performing data transfer.

Further, it is possible to make further expansions such as changing the specified value of time depending on the movement pattern of the mobile device immediately before or on a daily basis.

7. Effects of the Invention] As described above, according to the present invention, there is an advantage that data transfer that can efficiently correspond to various data transfer frequencies is possible using a unified procedure.

[Brief explanation of drawings]

Figure 1 is a diagram showing an example of the configuration of a mobile communication system, Figure 2 is a diagram showing the operation when the mobile equipment first sends data to the network after moving through the wireless zone, and Figure 3 is a diagram showing the operation when the mobile equipment first sends data to the network after moving through the wireless zone. FIG. 4 is a diagram showing the operation when the mobile device first sends data from the network to the mobile device after moving from one wireless zone to another. FIG. 4 is a diagram showing the operation when the mobile device moves to a wireless zone in a different location registration area. . 1-1 to 1-8... Wireless zone, 2-1 to 2-
8... Base station, 3-1.3-2... Location registration area, 4... Mobile device, 5...
Network equipment, 6...Memory, 11-17...
...data, 21.22...memory status of mobile device, 31.32...memory status of network equipment

Claims (1)

[Claims] In a mobile communication system in which a location registration area is configured by at least one wireless zone, and a mobile device transfers data to a network via a base station installed in each wireless zone, the mobile device Even if you move to a different wireless zone, you will not notify the network that you have moved; on the other hand, if you move to a wireless zone with a different location registration area, you will notify the network of the change in location registration area according to a predetermined procedure. During communication between the network and the mobile device, the network transmits data to the mobile device via the base station through which data or control signals from the mobile device to the network last passed, and transmits the data once or multiple times including retransmission. If there is no reception confirmation response for data transmission, all base stations within the location registration area where the mobile device is registered call the mobile device, and the data is retransmitted via the base station that received a response from the mobile device. A wireless zone switching method during communication, characterized in that: