KR100294001B1 - Method and system for recovery of radio channel in wireless local loop - Google Patents

Abstract

Disclosed are a method and system for recovering a wireless channel in a wireless subscriber network. In the wireless subscriber network, when the other party in the call hooks on the handset, the base station controller starts a timer and connects a busy tone to the subscriber. When a hook-on message is received from the subscriber, the base station controller terminates the call and recovers the radio channel. If the hook-on message is not received from the subscriber until the timer expires normally, the base station controller determines that the subscriber's handset is left unattended and forwards the hook-on message to the switching center to request the disconnection of the link. When a response to the hook-on message (i.e., link disconnect message) is received from the switching center, the base station controller terminates the call and recovers the radio channel. To recover the radio channel, the base station controller sends a call release message to the base station and the fixed station. Receiving the call release message, the base station releases all radio channels assigned to the subscriber station and then responds to the base station controller. At this time, the fixed station supplies an alarm sound to the subscriber to inform the subscriber that the radio channel is restored due to the subscriber's neglect of the handset.

Description

Recovery method and system of wireless channel in wireless subscriber network {METHOD AND SYSTEM FOR RECOVERY OF RADIO CHANNEL IN WIRELESS LOCAL LOOP}

The present invention relates to a wireless local loop (WLL), and more particularly, to a method and system for automatically releasing a call and recovering a radio channel assigned to the call when a subscriber leaves the handset in the wireless subscriber network. will be.

In a public switched telephone network (PSTN), a local loop refers to a connection between a subscriber and an exchange. A wireless subscriber network (WLL) connects subscribers and exchanges using wireless links instead of wired subscriber networks, such as copper circuits, coaxial cables, and fiber optics. The wireless subscriber network not only has reliability and flexibility because it uses wireless technology, but also can provide telephone service economically, so that the existing telephone network can be easily developed into an information communication network in an underdeveloped area.

1 is a block diagram showing the configuration of a typical wireless subscriber network. As shown, a local exchange (LE) 500 that connects the public switched telephone network 550 to a wireless subscriber network, a plurality of base station controllers (or radio distribution units) that are connected to one switching station. : RDU) 400, a plurality of base stations (or radio transmitting stations) connected to one base station controller (Radio Carrier Station (RCS) 300, 310), a plurality of fixed stations (or fixed) connected wirelessly to one base station Fixed Subscriber Unit (FSU) 200, 210, 220, 230, wired telephone subscribers 100, 110, 120, 130 connected to one fixed station 200 to 230, respectively. It includes. The wireless subscriber network is operated and maintained by the operating device 450.

In the wireless subscriber network configured as described above, when one subscriber sets down the handset, the call is terminated. However, if both subscribers do not put down the handset, the wireless channel by the subscriber is still occupied, and thus the wireless channel continues to be occupied even though the call is not made.

If either of the two subscribers (eg first subscriber, second subscriber) making a call, one of the subscribers (eg, the second subscriber) first hooks on the handset, the exchange will be connected to the other subscriber (eg 1) De-allocation message is sent to the base station controller connected to the subscriber. The base station controller receives the disassociation message and sounds a busy tone to the first subscriber. If a handset hook-on signal is not received from the first subscriber even though the caller sounds for a predetermined time (for example, 30 seconds), the base station controller sounds a howler tone to the first subscriber. If the handset hook-on signal is not received from the first subscriber even though the alarm sounds for a predetermined time (for example, 30 seconds), the base station controller continues to wait for the handset hook-on signal from the first subscriber.

2 is a flowchart illustrating a call termination method of a wireless subscriber network according to the prior art. When the other subscriber, who is busy with the subscriber of the wireless subscriber network, first hooks on, the switching station of the wireless subscriber network transmits a dislocation message to the base station controller. Upon receipt of the disposition message from the switching center (s10), the base station controller starts a first timer (e.g. 30 seconds) (s115) and confirms that the subscriber is hooked on (s120) when the first timer expires. If the subscriber does not hook on (s125), the base station controller connects a busy tone so that the subscriber can hear the busy tone (s130). Then, the second timer (for example, 30 seconds) is started (s135). It is checked whether it is hooked on (s140). If the subscriber does not hook on until the second timer expires (s145), the base station controller connects an alarm sound so that the subscriber hears an alarm sound (s150). Forwarding, the base station controller continues to wait until the subscriber is hooked on.

As described above, the switching center of the conventional wireless subscriber network continues to maintain the radio link between the subscriber and the base station until the hook-on message is transmitted from the base station controller. Therefore, the base station controller cannot perform any further processing for the subscriber. This situation also causes a problem of wasting a limited radio resource frequency and preventing other subscribers from using the frequency.

The present invention has been made to solve the problems of the prior art operating as described above, and to recover the radio channel in the wireless subscriber network, which prevents the occupancy of unnecessary radio channels caused by the subscriber leaving the handset in the wireless subscriber network. It is an object to provide a method and system.

Another object of the present invention is to forcibly disconnect a call if a hook-on message is not delivered from the subscriber even after a predetermined time has elapsed after the other subscriber hooks on the handset in the wireless subscriber network. It is to provide a recovery method and system.

Other objects and advantages of the present invention will become more apparent from the following detailed description of the invention and the accompanying drawings.

In a wireless subscriber network recovery method according to the present invention, which is designed to achieve the above object, in a wireless channel recovery method of a wireless subscriber network wirelessly connecting a subscriber and an exchange station,

Hooking up the handset by a second subscriber of another network having a call with a first subscriber of a wireless subscriber network;

If the first subscriber hooks on the handset after the second subscriber hooks on the handset, ending the call and recovering the radio channel assigned to the first subscriber;

If the first subscriber does not hook on the handset after the second subscriber hooks on the handset, starting a third timer and ringing the first subscriber;

If the first subscriber does not hook on the handset until the third timer expires normally, forcibly recovering the radio channel assigned to the first subscriber.

Another embodiment of a method for recovering a radio channel in a wireless subscriber network according to the present invention includes a fixed station connected to a first subscriber, a base station connected to the fixed station via a wireless channel, a base station controller connecting the base station to an exchange station, and In the radio channel recovery method of a wireless subscriber network comprising an exchange station for connecting the base station controller to another network,

The first subscriber making a call with a second subscriber of another network;

When the second subscriber hooks on the handset, the switching center sends a disposition message to the base station controller;

Receiving, by the base station controller, a disposition message, starting a third timer and ringing the first subscriber;

Restoring, by the base station controller, a radio channel assigned to the first subscriber if a hook-on message is received from the first subscriber before the third timer normally expires;

If the hook-on message is not received from the first subscriber until the third timer expires normally, the base station controller sends a hook-on message to the switch to request the disconnection of the link;

Sending a call release message to the base station, instructed to disconnect the link, forcibly restoring a radio channel assigned to the first subscriber.

1 is a block diagram showing the configuration of a typical wireless subscriber network.

2 is a flowchart illustrating a call termination method of a wireless subscriber network according to the prior art.

3 is a flowchart illustrating a method for recovering a wireless channel in a wireless subscriber network according to the present invention.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, terms to be described below are terms defined in consideration of functions in the present invention, and may vary according to the intention or custom of a user or an operator. Therefore, the definition should be made based on the contents throughout the specification.

The present invention is implemented in a base station controller of a wireless subscriber network. The base station controller according to the present invention transmits a hook-on message to the switching center if the hook-on message is not delivered from the subscriber connected with the subscriber even after a predetermined time has elapsed since the other subscriber was busy. Link disconnection is required.

The switching center receives the hook-on message from the base station controller and sends a link disconnect message to the base station controller to instruct the disconnection of the link. The base station controller receives the link disconnection message from the switching center, responds to the switching station with the disconnection completion message, and then recovers the wired or wireless resource (channel) occupied by the subscriber.

The present invention is implemented through the configuration of the wireless subscriber network shown in FIG. The present invention relates to a protocol between a base station controller and an exchange. In a wireless subscriber network, the base station controller is connected to the switching center using an E1 trunk that uses the V5.2 connection protocol. The present invention delivers a hook-on message from the base station controller to the switching center.

3 is a flowchart illustrating a method for recovering a wireless channel in a wireless subscriber network according to the present invention. Hereinafter, with reference to the accompanying drawings will be described in detail the operating principle of the preferred embodiment of the present invention.

When the first subscriber of the wireless subscriber network is talking to a second subscriber of another network, when the second subscriber hooks on the handset, the switching center of the wireless subscriber network detects this and releases the message to the base station controller connected to the first subscriber. (S210) Then, the base station controller starts the third timer (s220) and connects a ring tone to the first subscriber. (S230) When a hook-on message is received from the first subscriber (s240), the base station The controller terminates the call and recovers the radio channel (s280).

If no hook-on message is received from the first subscriber until the third timer expires normally, the base station controller forwards the on-hook message to the switching center to request the disconnection of the link. (S260) On-hook message from switching center If a response (ie, a link disconnection message) is received (s270), the base station controller transmits a disconnection completion message to the switching center and forcibly recovers the radio channel (s280).

The operator of the system can arbitrarily set the time of the third timer using the operating device 450. Therefore, the present invention can arbitrarily set the time that the handset of the first subscriber is left.

To forcibly recover the radio channel, the base station controller sends a call release message to the base station. The base station receiving the call release message releases all radio channels assigned to the fixed station of the first subscriber and then responds to the base station controller. At this time, the fixed station, which is instructed to release the radio channel from the base station, supplies a warning tone to the first subscriber to inform the first subscriber that the radio channel is forcibly recovered due to neglect of the handset.

The station then continues to check whether the first subscriber is hooked on. If the first subscriber does not hook on, the station will continue to sound an alarm. When the first subscriber hooks on, the fixed station stops the alarm sound, then recovers the connection state with the first subscriber and enters an idle state.

The present invention can be variously modified and can take various forms and only the specific embodiments thereof are described in the detailed description of the invention. It is to be understood, however, that the present invention is not limited to the specific forms mentioned in the detailed description of the invention, but rather includes all modifications, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. It should be understood to do.

In the present invention operating as described above, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

In a wireless subscriber network, a radio channel between a base station and a fixed station is very limited. Therefore, it is necessary to keep the wireless channel as much as possible in a busy time. If the subscriber in the wireless subscriber network has not left the handset normally on, the station and the base station continue to occupy the radio channel. Therefore, the lack of a wireless channel is limiting the call service.

According to the present invention, when the handset is left for a predetermined time, the base station controller detects this and releases the radio channel occupied between the fixed station and the base station. Therefore, the use efficiency of the wireless channel is maintained at an optimal state, providing a good call service.

Claims (17)

In the radio channel recovery method of a wireless subscriber network for wirelessly connecting a subscriber and an exchange station, Hooking up the handset by a second subscriber of another network having a call with a first subscriber of a wireless subscriber network; If the first subscriber hooks on the handset after the second subscriber hooks on the handset, ending the call and recovering the radio channel assigned to the first subscriber; If the first subscriber does not hook on the handset after the second subscriber hooks on the handset, starting a third timer and ringing the first subscriber; If the first subscriber does not hook on the handset until the third timer expires normally, forcibly restoring the wireless channel assigned to the first subscriber. Way. 2. The method of claim 1, further comprising the step of alarming the first subscriber after forcibly restoring the wireless channel. 3. The method of claim 2, further comprising restoring a connection state with the first subscriber and making it idle when the first subscriber hooks on a handset while the first subscriber is alerting. Recovery method of wireless channel in subscriber network. A radio station recovery of a wireless subscriber network including a fixed station connected to a first subscriber, a base station connected to the fixed station via a wireless channel, a base station controller connecting the base station to an switching station, and a switching station connecting the base station controller to another network. In the method, The first subscriber making a call with a second subscriber of another network; When the second subscriber hooks on the handset, the switching center sends a disposition message to the base station controller; Receiving, by the base station controller, a disposition message, starting a third timer and ringing the first subscriber; Restoring, by the base station controller, a radio channel assigned to the first subscriber if a hook-on message is received from the first subscriber before the third timer normally expires; If the hook-on message is not received from the first subscriber until the third timer expires normally, the base station controller sends a hook-on message to the switch to request the disconnection of the link; And forcing the base station controller, instructed to disconnect the link, to send a call release message to the base station to forcibly recover the wireless channel assigned to the first subscriber. 5. The method of claim 4, wherein the step of requesting disconnection of the link comprises: a base station controller sending an on-hook message according to the V5.2 protocol to an exchange. 5. The method of claim 4, wherein forcing the wireless channel to recover: Transmitting, by the base station controller, a call release message to the base station; And the base station receiving a call release message releases all radio channels allocated to the fixed station of the first subscriber, and then responds to the base station controller. 5. The method of claim 4, wherein forcibly restoring the wireless channel further comprises the step of the station station alerting the first subscriber. The method of claim 4, wherein the forcibly restoring the radio channel comprises: Forcing the base station to recover a radio channel; After the base station forcibly recovers a radio channel, the fixed station continuously checking whether the first subscriber is hooked on; If the first subscriber is not hooked on, the fixed station continues to provide an alarm sound; And when the first subscriber is hooked on, the fixed station stops the alarm sound, and then recovers the connection state with the first subscriber and is in an idle state. A wireless subscriber network connected to another network, comprising: forcibly recovering a radio channel assigned to a first subscriber if the handset of the first subscriber is left after the first subscriber's call is terminated. How to recover a wireless channel. 10. The method of claim 9, wherein if the first subscriber does not hook on the handset until a predetermined time has elapsed after the second subscriber who is talking to the first subscriber hooks on the handset, A method for recovering a wireless channel in a wireless subscriber network, which determines that the handset is left unattended. 10. The method of claim 9, further comprising the step of alarming the first subscriber after the radio channel assigned to the first subscriber is forcibly restored. 12. The method of claim 11, further comprising the step of suspending the alarm and going idle when the first subscriber hooks on the handset. An exchange that connects another network with a wireless subscriber network, Multiple base station controllers connected to one switching center, A plurality of base stations connected to one base station controller, Multiple fixed stations wirelessly connected to one base station, and In a wireless subscriber network comprising wireline subscribers each connected to one fixed station, And the base station controller requests the disconnection of the link to the switching center when the handset of the first subscriber is left after the call of the first subscriber is terminated. 14. The system of claim 13, wherein the base station controller is connected to an exchange through a V5.2 protocol. 14. The base station controller of claim 13, wherein the base station controller hooks up the handset by the first subscriber until a predetermined time has elapsed after the second subscriber who is talking to the first subscriber of the wireless subscriber network has hooked the handset. Otherwise, the handset of the first subscriber is determined to be left unattended. 14. The system of claim 13, further comprising a fixed station that alerts the first subscriber after the radio channel assigned to the first subscriber is forcibly restored. 17. The system of claim 16, wherein the fixed station suspends an alarm and goes idle when the first subscriber hooks on the handset.