Method for reconnection of a dropped call in mobile communication system

• US 6,633,760 B1
• Filed: 12/03/1999
• Issued: 10/14/2003
• Est. Priority Date: 12/03/1998
• Status: Expired due to Term

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Nak-Koo, Ham, Seok-Jin, Chun, Kyung-Joon
• Primary Examiner(s): Bost, Dwayne
• Assistant Examiner(s): SHARMA, SUJATHA R
• Application Number:
  US09/454,807
• Time in Patent Office: 1,411 Days
• Field of Search: 455/414, 455/412, 455/413, 455/422, 455/436, 455/450, 455/452, 455/453, 455/424, 455/435, 455/432, 455/439
• US Class Current: 455/422.1
• CPC Class Codes: H04Q 2213/13098 Mobile subscriber
• CPC Class Codes: H04Q 2213/13103 Memory
• CPC Class Codes: H04Q 2213/13176 Common channel signaling, CCS7
• CPC Class Codes: H04Q 2213/13204 Protocols
• CPC Class Codes: H04Q 2213/1327 Release and resetting of connection
• CPC Class Codes: H04Q 3/0025 Provisions for signalling

Abstract

Reconnection of a dropped call in a mobile communicating system. In the situation that a call drop occurs and a call is to be disconnected during a call service, a mobile station is informed of the call drop and the call is reconnected or disconnected according to a response of the mobile station without being released by a unilateral decision by a system. Furthermore, when the call drop occurs, the mobile station searches for an available channel and requests a call reconnection to the system.

Claims

1. A method of reconnecting a communication link terminated by an interruption in service during a communication between a mobile station (MS) subscriber and a subscriber communicating with the mobile station subscriber through a mobile communication system having a plurality of mobile switching centers (MSCs) connected to one another, each MSC being connected to a plurality of base stations (BSs), the method comprising the steps of:

receiving information about the communication link from a service providing one of the plurality of BSs and an MSC connected to the service providing BS, said received communication link information being stored by the MS, during the service between the MS subscriber and the other subscriber; and

transmitting the stored communication link information from the MS when the service interruption lasts for at least a first predetermined time period,

wherein the communication link information includes one of information about the MSC connected to the service providing BS and a cell of the service providing BS when the service is set up for initiating, and information about a current MSC connected to a current service providing BS and a cell of the current service providing BS.

2. The method recited in claim 1, wherein the first predetermined time period is hundreds of milliseconds.

3. A method of reconnecting a communication link terminated by a service interruption on a reverse channel during a service between an MS subscriber and a subscriber communicating with the mobile station subscriber through a mobile communication system having a plurality of MSCs connected to one another, each MSC being connected to a plurality of BSs, the method comprising the steps of:

receiving information about the communication link from a service providing one of the plurality of BSs and an MSC connected to the service providing BS, said received communication link information being stored by the MS, during the service between the MS subscriber and the other subscriber;

receiving a search request from the service providing BSs at the MS when the service interruption lasts for at least a first predetermined time period; and

transmitting the stored communication link information from the MS upon receipt of the search request by the BS,

wherein the communication link information includes one of information about the MSC connected to the service providing BS and a cell of the service providing BS when the service is set up for initiating, and information about a current MSC connected to a current service providing BS and a cell of the current service providing BS.

4. The method recited in claim 3, wherein the first predetermined time period is hundreds of milliseconds.

5. The method recited in claim 3, wherein the search request is transmitted to the MS at least once.

6. The method recited in claim 3, wherein the search request is transmitted to the MS a predetermined number of times over a predetermined interval.

7. The method recited in claim 6, wherein the predetermined interval is 1 or 2 seconds.

8. The method recited in claim 6, wherein upon receipt of the search request from the current service providing BS the predetermined number of times, the MS transmits the stored communication link information.

9. The method recited in claim 3, wherein a command message directed from the service providing BSs to the MS is used as the search request.

10. The method recited in claim 3, wherein if the MS does not receive the search request signal for a predetermined time, the MS releases the service.

11. The method recited in claim 3, wherein if a current call service providing BS does not receive the communication link information from the MS for a predetermined time period after the service providing BSs transmit the search request, the service providing BS releases the service.

12. The method recited in claim 11, wherein the predetermined time period ranges from 5 to 60 seconds.

13. A method of reconnecting a communication link terminated by a service interruption on a forward channel during a communication between an MS subscriber and a subscriber communicating with the mobile station subscriber through a mobile communication system having a plurality of MSCs connected to one another, each MSC being connected to a plurality of BSs, the method comprising the steps of:

receiving information about the communication link from a service providing one of the plurality of BSs and an MSC connected to the service providing one of the plurality of BSs, said received communication link information being stored by the MS during the service between the MS subscriber and the other subscriber;

detecting an available BS radio resource by the MS if the service interruption lasts for at least a first predetermined time period; and

transmitting the stored communication link information from the MS on a new channel detected in the BS radio resource detections

wherein the communication link information includes one of information about the MSC connected to the service providing BS and a cell of the service providing BS when the service is set up for initiating, and information about a current MSC connected to a current service providing BS and a cell of the current service providing BS.

14. The method recited in claim 13, wherein the first predetermined time period is a few seconds.