System and method for allocating channel elements in a code division multiple access radio telecommunications network

• US 5,933,777 A
• Filed: 04/24/1997
• Issued: 08/03/1999
• Est. Priority Date: 04/24/1997
• Status: Expired due to Term

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Rahman, Mohamed Anisur
• Primary Examiner(s): Bost, Dwayne D.
• Assistant Examiner(s): GELIN, JEAN ALLAND
• Application Number:
  US08/847,432
• Time in Patent Office: 831 Days
• Field of Search: 455/432, 455/436, 455/437, 455/439, 455/447, 455/450, 455/452, 455/453, 455/521, 455/525, 455/62, 455/464, 370/332, 370/335, 370/342, 370/328, 370/320, 370/329, 370/337, 370/347, 370/441, 370/442, 370/341
• US Class Current: 455/450
• CPC Class Codes: H04B 7/022 Site diversity; Macro-diversity using two or more spaced independent antennas H04B7/04
• CPC Class Codes: H04W 16/06 Hybrid resource partitioning, e.g. channel borrowing
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 36/18 for allowing seamless reselection, e.g. soft reselection
• CPC Class Codes: H04W 72/0466 the resource being a scrambling code
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

A method and system for allocating channel elements in a code division multiple access (CDMA) radio telecommunications network is disclosed. The method begins by a contribution assessor determining a candidate set of base stations having sufficient signal strength with the entering mobile station to establish a voice channel. Next, the contribution assessor measures the signal strength between each base station of the candidate set of base stations and the operating mobile stations served by each of the base stations. The contribution assessor determines which base station of the candidate set of base stations has the weakest signal strength with one of its served operating mobile stations. Then, a load processor reallocates a channel element away from the mobile station having the weakest signal strength to the entering mobile station.

Claims

1. A method of dynamically allocating a channel element to an entering mobile station entering a fully loaded code division multiple access (CDMA) radio telecommunications network having a plurality of base stations serving a plurality of operating mobile stations, said radio telecommunications network utilizing macro-diversity to provide duplicate channel elements to each operating mobile station, said method comprising the steps of:

determining a candidate set of base stations having sufficient signal strength with said entering mobile station to establish a voice channel;

measuring signal strength between each base station of said candidate set of base stations and each operating mobile station served by each base station of said candidate set;

determining which base station of said candidate set of base stations has a weakest signal strength with one of its served operating mobile stations;

disconnecting, by a load processor which controls said plurality of base stations, a channel element from said served operating mobile station with said weakest signal strength to the determined base station; and

reallocating the disconnected channel element to said entering mobile station.

2. The method of claim 1 wherein said step of reallocating a channel element includes connecting, by said load processor, a channel element from said base station having said weakest signal strength to said entering mobile station.

3. The method of claim 2 wherein said step of determining which base station of said candidate set of base stations has a weakest signal strength includes assessing, by a contribution assessor, which base station of said candidate set of base stations has said weakest signal strength.

4. The method of claim 3 further comprising, before the step of determining a candidate set of base stations, the step of determining whether said radio telecommunications network is fully loaded by a load capacity monitor.

5. The method of claim 4 wherein said step whether said radio telecommunications network is fully loaded by a load capacity monitor includes monitoring, by said load capacity monitor, for additional entering mobile stations.

6. A method of dynamically allocating a channel element for an emergency call to an entering mobile station entering a fully loaded code division multiple access (CDMA) radio telecommunications network having a plurality of base stations serving a plurality of operating mobile stations, said radio telecommunications network utilizing macro-diversity to provide duplicate channel elements to each operating mobile station, said method comprising the steps of:

alerting, by said entering mobile station, that said emergency call is originating in said radio telecommunications network;

determining a candidate set of base stations having sufficient signal strength with said entering mobile station to establish a voice channel;

measuring signal strength between each base station of said candidate set of base stations and each operating mobile station served by each base station of said candidate set;

determining which base station of said candidate set of base stations has a weakest signal strength with one of its served operating mobile stations;

disconnecting, by a load processor which controls said plurality of base stations, a channel element from said served operating mobile station with said weakest signal strength to the determined base station; and

reallocating the disconnected channel element to said entering mobile station.

7. The method of claim 6 wherein said step of reallocating a channel element includes connecting, by said load processor, a channel element from said base station having said weakest signal strength to said entering mobile station.

8. The method of claim 7 wherein said step of determining which base station of said candidate set of base stations has a weakest signal strength includes assessing, by a contribution assessor, which base station of said candidate set of base stations has said weakest signal strength.

9. A system for dynamically allocating a channel element to an entering mobile station entering a fully loaded code division (CDMA) radio telecommunications network having a plurality of base stations serving a plurality of operating mobile stations, said radio telecommunications network utilizing macro-diversity to provide duplicate channel elements to each operating mobile station, said system comprising:

means for determining a candidate set of base stations having sufficient signal strength with said entering mobile station to establish a voice channel;

means for measuring signal strength between each base station of said candidate set of base stations and each operating mobile station served by each base station;

means for determining which base station of said candidate set of base stations has the weakest signal strength with one of its served operating mobile stations;

a load processor for disconnecting a channel element from said served operating mobile station with said weakest signal strength to the determined base station; and

means for reallocating the disconnected channel element to said entering mobile station.

10. The system of claim 9 wherein said means for reallocating a channel element includes said load processor for connecting said channel element from said base station having said weakest signal strength to said entering mobile station.

11. The system of claim 10 wherein said means for determining which base station of said candidate set of base stations has a weakest signal strength includes a contribution assessor for assessing which base station of said candidate set of base stations has said weakest signal strength.

12. The system of claim 11 further comprising means for determining whether said radio telecommunications network is fully loaded.

13. The system of claim 9 further comprising means for alerting said radio telecommunications network that said entering mobile station is originating an emergency call.