KR20000020660A - Method for processing call of cellular system - Google Patents

Abstract

PURPOSE: A method for processing a call of cellular system id provided to allocate a radio channel to a mobile telephone by storing call information from the mobile telephone to a memory of a base station. CONSTITUTION: A method for processing a call of cellular system is to give a priority to aradion channel according to orders for trying call when the remaining source does not exist in the radio channel of a base station. The method for processing a call of cellular system comprises the steps of: requesting(s101) a call from a mobile telephone to a base station; allocating(s103) a radio channel to the mobile telephone if there is the remaining radio channel in the base station; storing(s104) the call information to a memory if there is not the remaining radio channel; and allocating(s111) the radio channel to the mobile telephone if the remaining radio channel generates in the base station.

Description

How to handle calls in cellular systems

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cellular system. In particular, when there is no free resource in a radio channel of a base station, priority is given to the radio channel according to the order in which the call is attempted. It relates to a call processing method of a cellular system.

The cellular mobile communication system divides the entire service area into a plurality of base station areas and constitutes cells, which are small service areas, and centrally controls these base stations to the mobile switching center so that subscribers can continue to talk while moving between cells. Make sure

1 illustrates a schematic diagram of a cellular system using Code Division Multiple Access (CDMA) technology. As shown, a base station transceiver subsystem (BTS) 20, 30, 40 which provides a mobile communication service to a mobile station (MS) 10, and a plurality of base stations, It consists of a Mobile Switching Center (MSC) 50 that connects to a Public Switched Telephone Network (PSTN) 60.

The base station receives a certain number of frequency resources from the system operator. When a mobile phone or mobile switching center requests a call for a call, the base station allocates a radio channel for traffic of the call within the allocated frequency resource. However, if the base station no longer has the resources to allocate the channel, the requested call fails because the base station cannot allocate the radio channel.

The conventional mobile telephone waits for 4 seconds unconditionally when it does not have a radio channel resource to be allocated by the base station. If no wireless channel is assigned while waiting for four seconds, the mobile phone fails to make a call. In the call processing method according to the prior art operating as described above, there is a problem that the requested call fails if the base station does not have a spare radio channel.

Accordingly, an object of the present invention, which was devised to solve the problems of the prior art operating as described above, is that a base station allocates a radio channel to a mobile phone when there is no free resource in the radio channel of the base station. To provide a way.

Another object of the present invention is to store call information of a mobile phone in a first input first output (FIFO) when the base station does not have a free radio channel, and if the free radio channel is generated, the order of higher priority and First, to provide a call processing method in a cellular system, which allocates radio channels in the stored order.

Another object of the present invention is to store call information of a mobile telephone in a first input first output (FIFO) when the base station does not have a spare wireless channel, and the mobile telephone requests deletion of the call information. The present invention provides a call processing method in a cellular system for deleting stored call information.

Another object of the present invention is to store call information of a mobile phone in a first input first output (FIFO) when the base station does not have a free radio channel, and delete the stored call information when the mobile phone is lost. To provide a call processing method in a cellular system.

Another object of the present invention is to provide a method for processing a call in a cellular system, in which the mobile phone automatically re-sends to a base station to be handed off without a subscriber's operation when the mobile phone waiting for the generation of a spare radio channel in the base station is performed. It is.

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

1 is a block diagram of a cellular system using code division multiple access techniques.

2 is a flowchart showing an embodiment of a call processing method according to the present invention;

3 is a flowchart showing an embodiment of a call processing method according to the present invention when the mobile telephone requests deletion of call information.

4 is a flowchart illustrating an embodiment of a call processing method according to the present invention when the mobile telephone is lost.

5 is a message flow diagram illustrating an embodiment of a call processing method according to the present invention when handoff is performed.

<Explanation of symbols for main parts of the drawings>

10: mobile phone 20, 30, 40: base station

50: mobile switching center 60: public switched telephone network

A preferred embodiment of a call processing method in a cellular system according to the present invention, which is invented to achieve the above object, is a base station that provides a mobile communication service to a mobile phone through a wireless channel and another base station or another system. A cellular system comprising a mobile switching center connecting to

A requesting step in which the base station is requested to make a call from the mobile telephone;

A first assigning step, if the base station has a spare radio channel, the base station assigns a radio channel to the mobile telephone;

Storing, by the base station, call information of the mobile telephone in a memory if there is no spare wireless channel in the base station; And

If a free radio channel is generated in the base station storing the call information, a second allocation step of allocating a radio channel to the mobile phone in which the call information is stored.

Another preferred embodiment of a call processing method in a cellular system according to the present invention is a base station that provides mobile communication services to first and second mobile telephones over a wireless channel and a mobile switching center that connects the base station to another base station or another system. In the cellular system comprising a,

Requesting a call origination from the base station by the first mobile telephone;

Identifying, by a base station, a free radio channel for the first mobile telephone;

A first assigning step of, if there is a spare radio channel, a base station assigning a radio channel to the first mobile telephone;

If there is no spare wireless channel, the base station storing call information of the first mobile telephone in a memory;

Notifying the first mobile phone of the storage result;

Requesting a call origination from the base station by a second mobile telephone;

Identifying, by a base station, a free radio channel for the second mobile phone;

A second allocating step of the base station assigning a radio channel to the second mobile phone if there is a spare radio channel;

If there is no free radio channel, a base station storing call information of the second mobile telephone in the memory;

A notification step of notifying the second mobile telephone of the storage result; And

And a third allocation step of allocating a radio channel to one of the mobile telephones in which the call information is stored when a free radio channel is generated in the base station storing the call information.

Another preferred embodiment of a call processing method in a cellular system according to the present invention is a cellular system comprising a base station providing a mobile communication service to a mobile telephone via a wireless channel and a mobile switching center connecting the base station to another base station or another system. To

A requesting step in which the base station is requested to make a call from the mobile telephone;

A first assigning step, if the base station has a spare radio channel, the base station assigns a radio channel to the mobile telephone;

Storing, by the base station, call information of the mobile telephone in a memory if there is no spare wireless channel in the base station;

A notification step of a base station notifying the mobile telephone of the storage result;

Requesting the base station to delete the stored call information from the mobile telephone notified of the storage result; And

And deleting, by the base station that is requested to delete the call information, the call information of the mobile telephone from the memory.

Another preferred embodiment of a call processing method in a cellular system according to the present invention comprises a mobile telephone, a base station providing a mobile communication service to a mobile telephone via a wireless channel, and a mobile switching center connecting the base station to another base station or another system. In a cellular system comprising:

The base station is requested to make a call from the mobile telephone;

If there is a spare radio channel, the base station assigning a radio channel to the mobile telephone;

If there is no free radio channel, the base station storing call information of the mobile telephone in a memory;

A base station notifying the mobile phone of the storage result;

Instructing the base station to redial when a free radio channel is generated in the base station storing call information; And

If the mobile phone does not redial for a predetermined time, the mobile phone is determined to be lost and the call information is deleted.

Another preferred embodiment of a call processing method in a cellular system according to the present invention is a mobile telephone, a base station providing a mobile communication service to a mobile telephone through a wireless channel, and a mobile switching center connecting the base station to another base station or another system. In the cellular system comprising a,

The base station is requested to make a call from the mobile telephone;

If there is a spare radio channel, the base station assigning a radio channel to the mobile telephone;

If there is no free radio channel, the base station storing call information of the mobile telephone in a memory;

A base station notifying the mobile phone of the storage result;

Performing the handoff by the mobile telephone notified of the storage result to the base station to be handoffed;

And the mobile telephone which has performed the handoff automatically redials the handoff target base station.

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. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification. Hereinafter, with reference to the accompanying drawings will be described in detail the operating principle of the preferred embodiment of the present invention.

2 is a flowchart illustrating an embodiment of a call processing method according to the present invention. In step s101, when the mobile telephone requests the base station to call, in step s102, the base station checks whether there is a spare wireless channel. If there is a spare radio channel, in step s103, the base station allocates a radio channel to the mobile phone and makes a call with the mobile phone.

If there is no spare radio channel, in step s104, the base station stores the call information of the mobile phone requesting the call, for example, the unique number of the mobile phone, in the first-in first-out memory, and in step s105, the call. Run a timer on the information.

In step s106, if a free radio channel does not occur in the base station until the timer expires, in step s107, the base station determines that the call fails and deletes the call information from the memory. In step s108, if a free radio channel occurs in the base station before the timer expires, in step s109, the base station instructs the mobile phone to redial. The idle state mobile phone monitors all paging channels it can detect and waits for the assignment of the radio channel. When the mobile phone waiting for the assignment of the radio channel receives a command from the base station, the mobile phone is clearly informed to the subscriber. Informing the base station of the occurrence of a wireless channel through distinguishable voice signals, sounds, and text messages.

In step s110, the mobile phone redials to the base station by the subscriber's key operation or automatically. In step s111, the base station allocates a radio channel to the redialed mobile phone and performs a call.

In order to assign radio channels in order to the mobile telephones requesting the call origination, the base station uses a first-in first-out memory (FIFO) that can store and output the mobile phone's unique number for the call in the order in which the call origination was requested. . The base station efficiently manages the first-in, first-out memory not to become full.

In step s104 of Fig. 2, when the base station stores call information of the mobile phone in the first-in, first-out memory, if call information of other mobile phones was previously stored in the memory, the base station stores the call information of the new mobile phone in the memory. Each time the location of the existing call information is changed. Therefore, the base station notifies a plurality of mobile telephones whose call information is stored in the first-in, first-out memory by a certain method of the location of the call information. At this time, the base station notifies the location of the call information only once when storing the call information, or periodically, whenever the location of the memory where the call information is stored changes, or when the location of the memory where the call information is stored becomes a certain order of the memory. You can be informed. The mobile phone uses the informed location to update the location of previously stored call information.

In step S104, the base station may notify the mobile telephone of the result of storing the call information, for example, the location (address) of the memory in which the call information is stored. When the base station notifies the mobile phone of the storage result, the mobile phone stores the location of the notified call information and informs the subscriber that it is waiting for the assignment of the radio channel using the screen or voice. The subscriber can then decide whether to continue to wait for allocation of the wireless channel or to attempt to make another call.

If a subscriber requests a new call without waiting for the assignment of a radio channel to a previously requested call, or if the subscriber wants to abandon the previous call, the subscriber can send the stored call to the base station via the mobile telephone. Requires deletion of the information.

3 is a flowchart illustrating another embodiment of the call processing method according to the present invention when the mobile telephone requests deletion of call information. As shown, in step s301, the base station notifies the mobile phone of the location of the call information stored in step 104. In step s302, the mobile phone uses the location of the call information notified by the mobile phone. If the base station is requested to delete the call information, in step s303, the base station deletes the previously stored call information from the memory, treats the existing call as a failure, and then processes the newly requested call origination.

If, in step s109 of Fig. 2, the base station instructs the mobile phone to redial to assign a radio channel, if the mobile phone moves through the handoff to the area of the base station to be handed off or powers off, the mobile phone You cannot receive a redial command message from the base station. If the base station does not receive a response (re-send) to the mobile phone for a certain time in step (s110) for the same reason as described above, the base station determines that the mobile phone is lost and performs the procedure according to B.

4 is a flowchart illustrating an embodiment of a call processing method according to the present invention when the mobile telephone is lost. As shown, in step s110, if the mobile phone does not redial after a certain period of time, the base station determines that the mobile phone is lost by handoff or power off. Then, in step S201, the base station determines that the call requested by the lost mobile phone has failed, waits for a predetermined time, deletes the previously stored call information, and allocates a radio channel to another mobile phone.

If the mobile phone is handed off to another base station, in step s202, the mobile phone redials to the handoff target base station, and in step s203, a mobile channel is allocated from the handoff target base station to perform a call.

5 is a message flow diagram illustrating an embodiment of a call processing method according to the present invention when handoff is performed. As shown, when the mobile phone 10 in the state waiting for the assignment of the radio channel by the base station 20 moves to the area of the handoff target base station 30 by handoff, the mobile phone 10 Is automatically re-sent to the handoff target base station 30 without the subscriber's operation. Then, in step s203, the handoff target base station 30 assigns a radio channel to the mobile telephone 10 and performs a call.

When the base station is requested to redial, in step S111 of FIG. The message between the base station and the mobile phone satisfying the standard according to IS-95B includes a field indicating the priority of the mobile phone and a field indicating a location (address) in a memory where call information of the mobile phone is stored. It is preferable to use said field as a processing method.

The base station, which does not have a spare radio channel, stores the call information of the mobile phone requesting the call in the first-in, first-out memory. When a spare radio channel is generated, the base station transmits the radio channel in order to the mobile phone whose call information is stored in the memory. Assign. If the memory stores call information of a plurality of mobile phones, the base station must determine the order in which the wireless channels are assigned to the mobile phones.

Typically, all mobile phones have a priority level set, which is stored with subscriber information in a location registration system that stores service information of the mobile phone. Therefore, the base station preferentially allocates a radio channel to a high priority mobile phone.

If all mobile phones have the same priority class, the base station preferentially assigns a radio channel to the mobile phone that requested the emergency call (eg 119). In addition, when all mobile phones require a general call, the base station first allocates a radio channel to the mobile phone that has requested the call origination.

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 in detail above, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

In the call processing method according to the present invention, a base station without a spare radio channel stores call information of a mobile telephone requesting call origination in a first-in, first-out memory in the order that a call is attempted, By allocating the channel, the call fails due to the lack of the radio channel of the base station. In addition, the mobile phone waiting for the free radio channel automatically re-sends the handoff target base station without the subscriber's operation, when the base station has a free radio channel or when the handoff is performed to the base station to be handed off. Can be removed. Therefore, the call processing method according to the present invention has an effect of improving the quality of the mobile communication service by increasing the success rate of the call.

Claims (24)

A cellular system comprising a base station providing a mobile communication service to a mobile telephone through a wireless channel and a mobile switching center connecting the base station to another base station or another system, A requesting step in which the base station is requested to make a call from the mobile telephone; A first assigning step, if the base station has a spare radio channel, the base station assigns a radio channel to the mobile telephone; Storing, by the base station, call information of the mobile telephone in a memory if there is no spare wireless channel in the base station; And And a second allocating step of allocating a radio channel to a mobile telephone having stored call information when a free radio channel is generated in a base station storing call information. The method of claim 1, wherein the call information includes a unique number of the mobile telephone. The method of claim 1, wherein the storing step, And a notification step of the base station notifying the mobile telephone of the storage result. The method of claim 3, wherein the notification step, And a base station notifies the mobile telephone of a location where call information is stored in a memory. The method of claim 3, wherein the notification step, The base station notifying the mobile telephone of the storage result; Updating, by the mobile telephone, the previously stored storage result using the informed storage result. The method of claim 5, wherein the notifying step: A method for handling a call in a cellular system that notifies the storage result whenever the location where call information is stored changes. The method of claim 5, wherein the notifying step: The method of call processing in a cellular system, which notifies the storage result until the location where the call information is stored becomes a certain order of memory. The method of claim 3, wherein the notification step, And informing the subscriber that the mobile phone is waiting for the assignment of a radio channel. The method of claim 1, wherein the storing step, Storing, by a base station, call information of the mobile telephone in a memory; A base station driving a timer for the stored call information; If the timer expires before allocating a radio channel to a mobile phone, determining that the call has failed and deleting the stored call information. The method of claim 1, wherein the second allocation step is A method of call processing in a cellular system, wherein the radio channel is preferentially assigned to the mobile telephone having the highest priority among mobile telephones in which call information is stored in a memory. The method of claim 10, wherein the second allocation step comprises: If all of the priorities of the mobile phones with the call information stored in the memory are the same, the radio channel is first assigned to the mobile phone having the call information stored first. The method of claim 1, wherein the second allocation step is Instructing the base station to redial when a free radio channel is generated; Automatically redialing, by the mobile telephone commanded to redial, to the base station; And And further comprising the step of the base station receiving the redial, allocating a radio channel to the mobile telephone. The method of claim 1, wherein the second allocation step is Instructing the base station to redial when a free radio channel is generated; Requesting the subscriber to redial by the mobile telephone commanded to redial; The subscriber redialing through the mobile telephone to the base station; And And further comprising the step of the base station receiving the redial, allocating a radio channel to the mobile telephone. The method of claim 12 or 13, wherein the second allocation step is And deleting, by the base station to which the radio channel has been allocated, the call information of the redialed mobile telephone from the memory in the memory. A cellular system comprising a base station providing mobile communication services to first and second mobile telephones over a wireless channel and a mobile switching center connecting the base station to another base station or another system, Requesting a call origination from the base station by the first mobile telephone; Identifying, by a base station, a free radio channel for the first mobile telephone; A first assigning step of, if there is a spare radio channel, a base station assigning a radio channel to the first mobile telephone; If there is no spare wireless channel, the base station storing call information of the first mobile telephone in a memory; Notifying the first mobile phone of the storage result; Requesting a call origination from the base station by a second mobile telephone; Identifying, by a base station, a free radio channel for the second mobile phone; A second allocating step of the base station assigning a radio channel to the second mobile phone if there is a spare radio channel; If there is no free radio channel, a base station storing call information of the second mobile telephone in the memory; A notification step of notifying the second mobile telephone of the storage result; And And a third allocating step of allocating a radio channel to one of the mobile phones in which the call information is stored when a free radio channel is generated in the base station storing the call information. The method of claim 15, wherein the notification step, The base station notifying the first and second mobile telephones of the location where call information is stored in memory; And the first and second mobile telephones updating the previously stored location of the previously stored memory using the informed location of the memory. The method of claim 15, wherein the third allocation step, A method for call processing in a cellular system, wherein the radio channel is preferentially assigned to the mobile telephones having the highest priority among mobile telephones in which call information is stored in a memory. The method of claim 15, wherein the third allocation step, A method for processing a call in a cellular system, wherein a radio channel is preferentially assigned to a mobile telephone that has requested the origination of an emergency call among mobile telephones having stored call information in a memory. The method of claim 15, wherein the third allocation step, A method for processing a call in a cellular system, wherein a radio channel is preferentially assigned to a mobile phone having call information stored first among mobile phones having call information stored in a memory. A cellular system comprising a base station providing a mobile communication service to a mobile telephone through a wireless channel and a mobile switching center connecting the base station to another base station or another system, A requesting step in which the base station is requested to make a call from the mobile telephone; A first assigning step, if the base station has a spare radio channel, the base station assigns a radio channel to the mobile telephone; Storing, by the base station, call information of the mobile telephone in a memory if there is no spare wireless channel in the base station; A notification step of a base station notifying the mobile telephone of the storage result; Requesting the base station to delete the stored call information from the mobile telephone notified of the storage result; And And deleting, by a base station that is requested to delete call information, the call information of the mobile telephone from the memory. 21. The method of claim 20, wherein requesting deletion of the call information comprises: Requesting, by the mobile telephone, the base station to delete the stored call information in order to request the origination of another call. A cellular system comprising a mobile telephone, a base station providing a mobile communication service to a mobile telephone through a wireless channel, and a mobile switching center connecting the base station to another base station or another system, The base station is requested to make a call from the mobile telephone; If there is a spare radio channel, the base station assigning a radio channel to the mobile telephone; If there is no free radio channel, the base station storing call information of the mobile telephone in a memory; A base station notifying the mobile phone of the storage result; Instructing the base station to redial when a free radio channel is generated in the base station storing call information; And And determining that the mobile phone is lost if the mobile phone does not redial after a predetermined time period, and deleting the corresponding call information. The method of claim 22, wherein the losing step, Wherein the base station does not receive a redial message from the mobile phone because the mobile phone having stored call information performs a handoff to a base station to be handed off or the mobile phone is powered off. A cellular system comprising a mobile telephone, a base station providing a mobile communication service to a mobile telephone through a wireless channel, and a mobile switching center connecting the base station to another base station or another system, The base station is requested to make a call from the mobile telephone; If there is a spare radio channel, the base station assigning a radio channel to the mobile telephone; If there is no free radio channel, the base station storing call information of the mobile telephone in a memory; A base station notifying the mobile phone of the storage result; Performing the handoff by the mobile telephone notified of the storage result to the base station to be handoffed; And Automatically re-dividing, by the mobile telephone that performed the handoff, to the base station to which the handoff is to be performed.