JP3929180B2 - Method of managing movement of subscriber terminal in wireless local loop system and wireless local loop system realizing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a subscription that enables movement of a subscriber terminal in a wireless local loop (WLL) system that implements an access line from a user terminal device to a network, in particular, a subscriber line from a subscriber terminal to an exchange. The present invention relates to a mobile terminal movement management method and a WLL system that implements the method.
[0002]
[Prior art]
A WLL system that realizes an access line from a user terminal device to a network, in particular, a subscriber line from a subscriber terminal to an exchange, at a relatively low cost by radio is attracting attention. The WLL system can be realized by directly applying a mobile communication system technology such as PHS (Personal Handyphone System).
[0003]
In a mobile communication system such as PHS, where the mobile terminal is located by the location registration function is always monitored from the network side in order to receive a call from the network side to the mobile terminal. That is, broadcast information including location information is constantly transmitted from each radio base station. The mobile terminal receives this even during the waiting period and stores the position information. When there are a plurality of receivable base stations, the mobile terminal selects one radio base station based on the reception level and error rate and stores the position information. To do. If there is a difference between the stored location information and the received location information due to movement, the terminal issues a request for registration of the current location of the terminal to the network. As a result, the network side can always grasp the current position of each mobile terminal and can receive calls from the network side to the mobile terminal.
[0004]
[Problems to be solved by the invention]
Even if the technology of the mobile communication system is applied to the WLL system, it is a principle that each terminal is fixed in the WLL system. Therefore, it is not necessary to implement a location registration function, which is a heavy burden on the system, on the system side.
However, there is a strong demand to use a mobile terminal even in the WLL system. In this case, it is possible to grasp which calling area the terminal is in without the location registration function, and to efficiently receive incoming calls 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 an office or the like.
[0005]
Therefore, an object of the present invention is to grasp which calling area a subscriber terminal is in without implementing a location registration function in a mobile communication system, and to efficiently receive a call from the network side to the subscriber terminal. It is an object of the present invention to provide a subscriber terminal mobility management method in a WLL system that can perform the same and a WLL system that implements the method.
[0006]
[Means for Solving the Problems]
According to the present invention, there is provided a mobile terminal mobility management method 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 an exchange. Then, when there is an incoming call request from the exchange side to one of the subscriber terminals, a call signal is sent from all the radio base stations connected to the base station controller to the subscriber terminal, and A method is provided comprising the steps of determining and storing the location of the subscriber terminal based on which radio base station received the call response from the subscriber terminal.
[0007]
According to the present invention, there is provided 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 an exchange, the subscriber from the exchange side. Means for sending 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 terminals, and from the subscriber terminal for the call signal There is also provided a system comprising means for determining and storing the location of the subscriber terminal based on which radio base station received the paging response.
[0008]
In the case of a general mobile radio system, since the range in which the mobile terminal can move is wide, it is not realistic to call all areas for each incoming call. However, in the WLL system, since there are not many radio base stations under the control of one base station controller, the burden on the system is not great even if calls are made to all radio base stations.
In addition, in 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. In such a case, it is difficult to recover quickly, and a mechanism that prevents this from happening is necessary. On the other hand, according to the movement management method of the present invention, even if the position information of the terminal is lost on the system side, the position information can be newly acquired at the time of incoming call to the terminal or outgoing call from the terminal.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a configuration of a WLL system according to an embodiment of the present invention. At least one radio base station 12 is arranged in each call area 10. All the radio base stations 12 are connected to a base station controller 14, which is further connected to a switch of the telephone network 16 through a world standard interface. Reference numeral 18 denotes a subscriber terminal that receives services of the WLL system. The subscriber terminal 18 includes a mobile terminal (PS = Portable Station) in addition to a stationary terminal such as a home phone or a public telephone connected to a SU (Subscriber Unit). The billing information of the WLL system subscribers is stored in the home memory 20 in the same manner as the other subscriber information of the telephone network 16. On the other hand, all information unique to the WLL system, such as location information of each subscriber terminal, is stored in the base station controller 14 as described later. Therefore, an exchange having a global standard interface can be connected without changing the design on the network 16 side. That is, this system is an exchange compatible system.
[0010]
FIG. 2 shows the configuration of the base station controller 14. The call control communication unit 22 that performs call control and communication path setting is connected to the exchange of the telephone network 16 (FIG. 1) via the exchange interface 24, and is connected to many radio base stations 12 via the radio base station interface 26. Has been.
When performing call control, the call control communication unit 22 refers to the contents of the station data 28 and the fixed subscriber information 30 and reads and writes the contents of the variable subscriber information 32.
[0011]
The station data 28 stores the number of the radio base station 12 (FIG. 1) connected to the base station controller 14 and the number of the calling area 10 to which each radio base station 12 belongs. As described above, one or more radio 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 in the WLL system and 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 the processing described later, that is, the in-service area number indicating in which calling area each terminal 18 exists. Instead of storing the number of the calling area 10 as the location information of the terminal 18, a base station number indicating which radio base station 12 each terminal 18 communicates with may be stored.
[0012]
FIG. 3 shows a sequence from when a call request is received from the subscriber terminal 18 to determining the area number (or the number of the base station in communication) using this and storing it as the variable subscriber information 32 Indicates.
In FIG. 3, first, when the base station controller 14 is activated, all the area numbers in the variable subscriber information 32 are reset (step 1000). Thereafter, when a call origination request is issued from the subscriber terminal 18 toward a certain radio base station 12, it is transmitted to the base station controller 14 (step 1002). The base station control device 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 it is a registered subscriber, the station data 28 is searched using the number of the radio base station that has notified the outgoing signal to determine the calling area (step 1006), and the number of the determined calling area is changed to the variable subscriber. The area number is stored in the information 32 (step 1008). Thereafter, normal outgoing connection processing is started. When the radio base station number is stored as the variable subscriber information 32, the processing in step 1006 is not necessary, and the radio base station number that has notified the transmission request is stored in the variable subscriber information 32.
[0013]
FIG. 4 shows the sequence of determining and storing the 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 side, it is first checked with reference to the fixed subscriber information 30 whether the destination terminal is a mobile terminal (step 1100). When the terminal is not a mobile terminal, it is checked whether or not the area number of the destination terminal is stored by referring to the variable subscriber information 32. If the area number is stored, a call signal is sent to the call area (step 1104), and if there is a response from the terminal to the call signal (step 1106), the process proceeds to normal incoming connection processing. To do. When the destination terminal is a mobile terminal or the area in which it is not stored is stored, the process proceeds to the all area calling process.
[0014]
FIG. 5 shows a processing sequence for calling all areas. A call signal for calling a destination subscriber terminal is sent to all the radio base stations 1 to N (step 1200). 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 by referring to the fixed subscriber information 30 (step 1204). Reject (step 1206). If registered, the station data 28 is searched using the number of the radio base station that has notified the outgoing signal to determine the calling area (step 1206), and the determined calling area number is stored in the variable subscriber information 32. Stored as a service area number (step 1208). Thereafter, normal incoming connection processing is started.
[0015]
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 area number of the destination terminal is stored in the variable subscriber information 32 (step 1300), a call signal is sent to the destination terminal. (Step 1302), a call response waiting timer is started (Step 1304). If the timer times out while there is no call response from the subscriber terminal, the all-area call process described with reference to FIG. 5 is executed, whereby the number of the call area in which the terminal after moving exists is variable subscriber. Stored in information 32.
[0016]
【The invention's effect】
As described above, according to the present invention, a service to a mobile terminal can be provided in the WLL system without implementing a location registration function. Further, since the location information of the terminal is managed not on the network side but on the WLL system side, exchange compatibility is maintained.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a WLL system according to an embodiment of the present invention.
2 is a block diagram showing a configuration of a base station control device 14 of FIG.
FIG. 3 is a diagram showing a mobility management sequence when a call request is made from a subscriber terminal.
FIG. 4 is a diagram showing a mobility management sequence when there is an incoming call request from the network side.
FIG. 5 is a diagram showing a sequence of all area call processing;
FIG. 6 is a diagram illustrating a mobility management sequence that can accommodate the movement of a fixed terminal.
[Explanation of symbols]
10 ... Call area 12 ... Radio base station 18 ... Subscriber terminal

Claims (6)

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 from the network side to one of the subscriber terminals, a call signal is sent to the subscriber terminal from all the radio base stations connected to the base station controller,
Each step of determining and storing the location of the subscriber terminal based on which radio base station has received a call response from the subscriber terminal to the call signal ;
A distinction is made beforehand whether the subscriber terminal is a fixed terminal or a mobile terminal,
A method in which, when there is an incoming call request from the network side, transmission of call signals from all radio base stations is determined based on the distinction .   And further comprising the step of determining and storing the position of the subscriber terminal based on which radio base station has received the call request when there is a call request from one of the plurality of subscriber terminals. Item 2. The method according to Item 1.   The method according to claim 1, wherein when there is an incoming call request from the network, if there is no response to the stored call signal to the location of the subscriber terminal, the call signal is transmitted from all radio base stations. 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,
Means for sending a call signal from all the radio base stations connected to the base station controller to the subscriber terminal when there is an incoming request from the network side to one of the subscriber terminals;
Means for determining and storing the position of the subscriber terminal based on which radio base station has received a call response from the subscriber terminal to the call signal ;
Means for storing in advance the distinction between the subscriber terminal being a fixed terminal and a mobile terminal;
The call signal sending means is a system that, when there is an incoming call request from the network side, decides to send a call signal from all radio base stations based on the distinction . And a means for determining and storing the location of the subscriber terminal based on which radio base station has received the call request when there is a call request from one of the plurality of subscriber terminals. Item 5. The system according to Item 4 . The call signal sending means, when a call request from the network, if there is no response to the call signal to the location of the subscriber terminal stored, claim and sends a call signal from all the radio base stations 4 The described system.

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