Method for registering the location of a mobile station after performing inter-MSC soft handoff in a cellular

• US 6,421,539 B1
• Filed: 08/27/1999
• Issued: 07/16/2002
• Est. Priority Date: 08/27/1998
• Status: Expired due to Term

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Jeong, Jin-soo
• Primary Examiner(s): Hunter, Daniel
• Assistant Examiner(s): Gantt, Alan T.
• Application Number:
  US09/384,856
• Time in Patent Office: 1,054 Days
• Field of Search: 455/433, 455/436, 455/437, 455/439, 455/440, 455/442, 455/443, 455/456
• US Class Current: 455/442
• CPC Class Codes: H04W 36/12 Reselecting a serving backbone network switching or routing node
• CPC Class Codes: H04W 36/18 for allowing seamless reselection, e.g. soft reselection
• CPC Class Codes: H04W 60/04 using triggered events

Abstract

The present invention discloses a method for registering the location of a mobile station after performing inter-MSC (mobile switching center) soft handoff in a cellular system. The cellular system has a plurality of base transceiver stations (BTSs) and a plurality of the MSCs, the plurality of BTSs rendering the mobile communication service to the mobile stations in a specific area. The method has the steps of performing inter-MSC soft handoff according to the movement of a mobile station from a BTS in service to the different BTSs which are controlled by another MSC, completing the call by the mobile station normally and synchronizing with the BTS having the strongest pilot signal, ordering to the mobile station to register the location of the mobile station by the synchronized BTS and performing the location registration to the MSC controlling the synchronized BTS by the mobile station through the synchronized BTS.

Claims

1. A method for registering the location of a mobile station after performing inter-MSC (mobile switching center) soft handoff in a cellular system of the type having a plurality of base transceiver stations (BTSs) and a plurality of the MSCs, said method comprising the steps of:

(a) performing an inter-MSC soft handoff according to the movement of said mobile station from a first BTS controlled by a first MSC to a second BTSs controlled by a second MSC;

(b) synchronizing said mobile station with a said second BTS, wherein said second BTS having the strongest pilot signal;

(c) ordering said mobile station to register a location of said mobile station by said synchronized second BTS; and

,

(d) performing a location registration to said second MSC controlling said synchronized second BTS with the registered location of said mobile station registered in step (c), wherein said inter-MSC soft handoff is performed by using a router, said router connecting said first BTS and said second BTS.

2. The method as set forth in claim 1, wherein said first BTS initially connected to said MSC receives information about location registration from said second BTS connected in said inter-MSC handoff via said router.

3. A method for registering the location of a mobile station after performing inter-MSC (mobile switching center) soft handoff in a cellular system of the type having a plurality of base transceiver stations (BTSs) and a plurality of the MSCs, said method comprising the steps of:

(a) performing an inter-MSC soft handoff according to the movement of said mobile station from a first BTS controlled by a first MSC to a second BTSs controlled by a second MSC;

(b) abnormally completing a call by said mobile station after performing said inter-MSC soft handoff;

(c) synchronizing said mobile station with a said second BTS, wherein said second BTS having the strongest pilot signal;

(d) ordering said mobile station to register a location of said mobile station by said synchronized second BTS; and

,

(e) performing a location registration to said second MSC controlling said synchronized second BTS with the registered location of said mobile station registered in step (d), wherein said inter-MSC soft handoff is performed by using a router, said router connecting said first BTS and said second BTS.

4. The method as set forth in claim 3, wherein said first BTS initially connected to said MSC receives information about location registration from said second BTS connected in said inter-MSC handoff via said router.

5. A method for registering the location of a mobile station after performing inter-MSC (mobile switching center) soft handoff in a cellular system of the type having a plurality of base transceiver stations (BTSs) and a plurality of the MSCs, said method comprising the steps of:

(a) performing an inter-MSC soft handoff according to the movement of said mobile station from a first BTS controlled by a first MSC to a second BTSs controlled by a second MSC;

(b) updating the status of said mobile station during an idle state after said inter-MSC soft handoff and completion of a call by said mobile station;

(c) synchronizing said mobile station with a said second BTS, wherein said second BTS having the strongest pilot signal;

(d) performing a location registration to said second MSC controlling said synchronized second BTS with the registered location of said mobile station registered in step (c); and

,

(e) requesting a location registration of said mobile station by said synchronized BTS before performing step (d), wherein said inter-MSC soft handoff is performed by using a router, said router connecting said first BTS and said second BTS.

6. The method as set forth in claim 5, wherein said step of completing the call of said mobile station is performed after the completion of the inter-MSC soft handoff.

7. The method as set forth in claim 5, wherein said step of updating the status of said mobile station and completing the call is performed during a time period when said inter-MSC soft handoff is performed.

8. The method as set forth in claim 5, wherein said step of updating the status of said mobile station and completing the call is performed during a time period when said inter-MSC soft handoff is performed.