JP2000059844A - Movement management method for subscriber terminal in wireless local loop system and wireless local loop system to realize the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a movement management method that makes the use of a mobile terminal possible in a wireless local loop WLL system. SOLUTION: When an incoming call request comes from a network (exchange) side, stationary subscriber information 30 is referenced and when an incoming call destination is a mobile terminal, a call signal is sent to all radio base stations connecting to a base station controller and decides the number of a call area to which the radio base station informing of a call reply belongs by referencing station data 28 and stores the number to variable subscriber information 32 as a resident area number. When a call request comes from a subscriber terminal, the radio base station informing of the call request decides the resident area number. In the case of an incoming call from the network to a stationary terminal, the resident area number is used to call the subscriber terminal and makes a call to all call areas when no reply is received.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a subscriber terminal in a wireless local loop (WLL) system for wirelessly realizing an access line from a user terminal device to a network, particularly a subscriber line from a subscriber terminal to an exchange. The present invention relates to a method for managing the movement of a subscriber terminal which enables the movement of a subscriber terminal and a WLL system for realizing the method.

[0002]

2. Description of the Related Art Attention has been focused on a WLL system in which an access line from a user terminal device to a network, in particular, a subscriber line from a subscriber terminal to an exchange is realized relatively inexpensively by radio. This WLL system can be realized by directly applying the technology of a mobile communication system such as a PHS (Personal Handy Phone System).

[0003] In a mobile communication system such as a PHS, the location registration function constantly monitors where each mobile terminal is located from the network side in order to receive a call from the network side to the mobile terminal. That is, broadcast information including position information is constantly transmitted from each wireless base station. The mobile terminal receives the information even during the waiting period and stores the position information, and when there are a plurality of receivable base stations, selects one radio base station based on the reception level and the error rate and stores the position information. I do. If the movement causes a difference between the stored location information and the received location information,
The terminal issues a request for registration of the current position of the terminal to the network.
As a result, the current position of each mobile terminal can always be grasped on the network side, and incoming from the network side to the mobile terminal becomes possible.

[0004]

Even if the technology of the mobile communication system is applied to the WLL system, since the terminals are fixed in the WLL system in principle, the location registration function which places a heavy burden on the system is not provided by the system. There is no need to implement on the side. However, there is a strong demand for using a mobile terminal even in a WLL system, and in this case, it is possible to know which call area the terminal is in without a location registration function, and to efficiently receive a call from the network side to the terminal. desirable. Further, even in the case of a fixed terminal, it is desirable that the service can be continued without special installation work when the fixed terminal moves to another calling area due to moving of a business office or the like.

Accordingly, an object of the present invention is to make it possible to know which calling area a subscriber terminal is in without implementing a location registration function in a mobile communication system, and to receive an incoming call from the network side to the subscriber terminal. An object of the present invention is to provide a mobility management method of a subscriber terminal in a WLL system that can be performed efficiently and a WLL system that realizes the method.

[0006]

According to the present invention, there is provided a wireless local loop system including a plurality of radio base stations, and a base station controller connected to all of the plurality of radio base stations and an exchange. A method for managing the movement of a subscriber terminal, wherein when a call is received from one of the exchanges to one of the subscriber terminals, a call is made from all the radio base stations connected to the base station controller to the subscriber terminal. A method for transmitting a signal and determining and storing the location of the subscriber terminal based on which radio base station has received a paging response from the subscriber terminal to the paging signal. You.

According to the present invention, there is provided a wireless local loop system including a plurality of radio base stations, and a base station controller connected to all of the plurality of radio base stations and the exchange, wherein Means for transmitting a call signal from all the radio base stations connected to the base station controller to the subscriber terminal when there is an incoming call request from the subscriber station to one of the subscriber terminals; Means for determining and storing the location of the subscriber terminal based on which radio base station has received the call response from the terminal.

In the case of a general mobile radio system, it is not practical to call all areas every time a call is received because the mobile terminal has a wide movable range. However, in the WLL system, since the number of radio base stations under one base station controller is not large, even if calls are made to all the radio base stations, the load on the system is not large. In addition, in the location registration in a general mobile radio system, a location registration request is not issued to the mobile terminal unless the location information received from the radio base station changes, so that the location registration information of each terminal is lost due to a failure on the system side. It is difficult to restore quickly, and there is a need for a mechanism that will never do so. On the other hand, according to the mobility management method of the present invention, even if the system loses the location information of the terminal, the location information can be newly acquired at the time of the incoming call to the terminal or the call from the terminal.

[0009]

FIG. 1 shows a W according to an embodiment of the present invention.
1 shows a configuration of an LL system. At least one radio base station 12 is arranged in each of the call areas 10. All radio base stations 12 are connected to a base station controller 14, which is further connected to a switch of the telephone network 16 with a world standard interface. Reference numeral 18 denotes a subscriber terminal that receives a service of the WLL system. Subscriber terminal 1
Reference numeral 8 includes a mobile terminal (PS = Portable Station) in addition to a fixed installation type terminal such as a home telephone or a public telephone connected to an SU (Subscriber Unit). Billing information and the like of a subscriber of the WLL system are stored in the home memory 20 in exactly the same manner as information of other subscribers of the telephone network 16.
On the other hand, all information unique to the WLL system, such as the position information of each subscriber terminal, is stored in the base station controller 14 as described later. Therefore, an exchange having a world standard interface can be connected without changing the design on the network 16 side. That is, the present system is an exchange-compatible system.

FIG. 2 shows the configuration of the base station controller 14.
A call control communication unit 22 for performing call control and setting a communication path is connected to an exchange of the telephone network 16 (FIG. 1) via an exchange interface 24, and is connected to a number of radio base stations 12 via a radio base station interface 26. Have been.
In performing the call control, the call control communication unit 22 reads and writes the contents of the variable subscriber information 32 with reference to the station data 28 and the contents of the fixed subscriber information 30.

The station data 28 stores the numbers of the radio base stations 12 (FIG. 1) connected to the base station controller 14 and the numbers of the call areas 10 to which each radio base station 12 belongs. As described above, one or more wireless base stations 12 are arranged in each call area 10. The fixed subscriber information 30 stores the number (telephone number) of each subscriber terminal 18 of the WLL system and the distinction as to whether it is a mobile terminal (PS) or a fixed terminal (SU). The variable subscriber information 32 stores the location information of each terminal determined by a process described later, that is, a service area number indicating in which calling area 10 each terminal 18 exists.
Instead of storing the number of the call area 10 as the position information of the terminal 18, a base station number indicating which radio base station 12 each terminal 18 is communicating with may be stored.

FIG. 3 shows a case where an outgoing call request is made from the subscriber terminal 18 to determine a service area number (or the number of a communicating base station) and store it as variable subscriber information 32. The sequence up to is shown. In FIG. 3, when the base station controller 14 is activated, all the service area numbers of the variable subscriber information 32 are reset (step 1000). Thereafter, when a calling request is issued from the subscriber terminal 18 to a certain radio base station 12, the request is transmitted to the base station controller 14 (step 1002). The base station controller 14 refers to the fixed subscriber information 30 to check whether or not the subscriber terminal that has issued the transmission request is registered (step 1004). If not registered, the transmission is rejected (step 1006). . If the subscriber is a registered subscriber, the station data 28 is searched using the number of the radio base station that has notified the transmission signal to determine a calling area (step 1006), and the determined calling area number is changed to a variable subscriber. It is stored as a service area number in the information 32 (step 1).
008). Thereafter, normal outgoing connection processing is started.
When the wireless base station number is stored as the variable subscriber information 32, the processing in step 1006 is unnecessary, and the wireless base station number that has notified the calling request is stored in the variable subscriber information 32.

FIG. 4 shows a sequence for determining and storing a service area number (or base station number) when there is an incoming call request from the network 16 side. When there is an incoming call request from the network, first, it is checked whether or not the destination terminal is a mobile terminal by referring to the fixed subscriber information 30 (step 1100). If the mobile terminal is not a mobile terminal, it is next checked by referring to the variable subscriber information 32 whether or not the service area number of the destination terminal is stored. If the serving area number is stored, a calling signal is sent to the calling area (step 11).
04) If there is a response from the terminal to the call signal (step 1106), the process shifts to a normal incoming connection process. When the destination terminal is a mobile terminal or when no area is stored, the processing shifts to the all area calling process.

FIG. 5 shows a sequence of processing for calling all areas. A call signal for calling the called subscriber terminal is sent to all the radio base stations 1 to N (step 120).
0). If there is a response from the terminal to the call signal (step 1202), it is checked whether or not the responding terminal is registered with reference to the fixed subscriber information 30 (step 1202).
4) If not registered, the call is rejected (step 1206). If registered, the calling area is determined by searching the station data 28 using the number of the wireless base station that has notified the transmission signal (step 1206), and the determined calling area number is stored in the variable subscriber information 32. It is stored as a service area number (step 1208). Thereafter, a normal incoming connection process is started.

FIG. 6 shows a sequence for realizing a mobility management method capable of continuing service without special installation work even if the fixed terminal moves and moves to another calling area. When there is an incoming request from the network side (to the fixed terminal) and the variable subscriber information 32 stores the area area number of the destination terminal (step 1300), a call signal is sent to the destination terminal. (Step 1302),
The call response waiting timer is started (step 130).
4). If the timer times out while there is no paging response from the subscriber terminal, the processing of the all area paging described with reference to FIG. 5 is executed, whereby the number of the paging area where the moved terminal is located is changed by the variable subscriber. Information 32 is stored.

[0016]

As described above, according to the present invention,
In a WLL system, a service to a mobile terminal can be provided without implementing a location registration function. In addition, since the location information of the terminal is managed on the WLL system side, not on the network side, exchange switch compatibility is maintained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a WLL system according to one embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a base station controller 14 of FIG.

FIG. 3 is a diagram showing a sequence of mobility management when a calling request is issued from a subscriber terminal.

FIG. 4 is a diagram showing a sequence of mobility management when there is an incoming call request from the network side.

FIG. 5 is a diagram showing a sequence of an all area calling process.

FIG. 6 is a diagram showing a sequence of mobility management capable of coping with the movement of a fixed terminal.

[Explanation of symbols]

 10 ... calling area 12 ... wireless base station 18 ... subscriber terminal

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Makoto Saito 3-9-118 Shin-Yokohama, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture Inside Fujitsu Communication Systems Limited (72) Ryoichi Ishibashi Ryoichi Ishibashi Kamio-Danaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture 4-1-1 1-1 Fujitsu Limited (72) Inventor Katsutoshi Inoko 2-3-9 Shin-Yokohama, Kohoku-ku, Yokohama-shi, Kanagawa Fujitsu Digital Technology Limited In-house

Claims (8)

[Claims] 1. A method for managing the movement of a subscriber terminal in a wireless local loop system comprising a plurality of radio base stations and a base station controller connected to all of the plurality of radio base stations and a network. When there is an incoming call request to one of the subscriber terminals from the network side, a paging signal is transmitted from all the radio base stations connected to the base station controller to the subscriber terminal, and the paging signal for the paging signal is transmitted. A method comprising the steps of determining and storing the location of a subscriber terminal based on which radio base station has received a call response from the subscriber terminal. 2. When a call request is issued from one of the plurality of subscriber terminals, a position of the subscriber terminal is determined and stored based on which radio base station has received the call request. The method of claim 1, further comprising: 3. A distinction as to whether a subscriber terminal is a fixed terminal or a mobile terminal is stored in advance, and when there is an incoming call request from the network side, all the radio base stations receive information based on the distinction. 2. The method of claim 1, wherein sending a paging signal is determined. 4. A calling signal is transmitted from all the radio base stations when there is no response to the stored calling signal to the location of the subscriber terminal when there is an incoming call request from the network. the method of. 5. A wireless local loop system comprising a plurality of radio base stations and a base station controller connected to all of the plurality of radio base stations and a network, wherein a subscriber terminal is provided from a network side. Means for transmitting a call signal from all the radio base stations connected to the base station controller to the subscriber terminal when there is an incoming call request to one of the base stations, and a call from the subscriber terminal for the call signal. Means for determining and storing the location of the subscriber terminal based on which radio base station received the response. 6. A means for determining and storing the position of a subscriber terminal based on which radio base station has received the call request when a call request is received from one of the plurality of subscriber terminals. The system of claim 5, further comprising: 7. The system further comprises means for storing in advance whether the subscriber terminal is a fixed terminal or a mobile terminal, wherein the call signal transmitting means receives an incoming request from a network side. 6. The system according to claim 5, wherein a decision is made to transmit a paging signal from all radio base stations based on the distinction. 8. The paging signal transmitting means, when there is an incoming call request from the network, if there is no response to the stored paging signal to the location of the subscriber terminal, the paging signal is transmitted from all the radio base stations. 6. The system of claim 5, wherein the system sends.