System and method of dynamically increasing the capacity of a code division multiple access radio telecommunications network

• US 6,078,817 A
• Filed: 04/24/1997
• Issued: 06/20/2000
• 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): Eisenzopf, Reinhard J.
• Assistant Examiner(s): Kincaid, Lester G.
• Application Number:
  US08/839,235
• Time in Patent Office: 1,153 Days
• Field of Search: 455/442, 455/450, 455/451, 455/452, 455/453, 455/8, 455/9, 455/509, 455/510, 455/512, 455/67.1, 455/422, 455/445, 455/62, 455/63, 370/441, 370/331, 370/335, 370/342
• US Class Current: 455/452.1
• CPC Class Codes: H04W 16/06 Hybrid resource partitioning, e.g. channel borrowing
• CPC Class Codes: H04W 36/18 for allowing seamless reselection, e.g. soft reselection

Abstract

A method and system for dynamically increasing the capacity of a code division multiple access (CDMA) radio telecommunications network. The method begins by the radio telecommunications network receiving a request for access to the radio telecommunications network from an entering mobile station. Next, a load capacity monitor determines if the radio telecommunications network is fully loaded. When the radio telecommunications network is fully loaded, a network load processor releases one of a duplicate channel element (transceiver) used in the CDMA radio telecommunications network by one of the operating mobile stations. The network load processor then assigns the released channel element to the entering mobile station. The system includes a load capacity monitor to determine whether the radio telecommunications network is fully loaded. The system also includes a network load processor to reallocate duplicate channel elements from the operating mobile stations to the entering mobile station.

Claims

1. A method of dynamically increasing capacity of a fully loaded code division multiple access (CDMA) radio telecommunications network having a plurality of base stations serving a plurality of operating mobile stations on a plurality of channel elements, said radio telecommunications network utilizing a macro-diversity technique to improve radio quality between the base stations and each operating mobile station, said method comprising the steps of:

simultaneously providing a plurality of duplicate radio channel elements from at least one base station to each mobile station operating in the radio telecommunications network;

receiving a request for access to said fully loaded radio telecommunications network from an additional mobile station;

determining, by a load capacity monitor, whether said radio telecommunications network is fully loaded;

releasing one of said duplicate channel elements from one of said operating mobile stations, upon determining that said radio telecommunications network is fully loaded; and

assigning said released channel element to said additional mobile station.

2. The method of claim 1 wherein said step of releasing one of said duplicate channel elements includes:

modifying, by a network load processor, a parameter affecting allocation of said plurality of base stations serving said plurality of operating mobile stations from an original value in order to reduce use of said plurality of base stations by said plurality of operating mobile stations; and

transmitting, by said network load processor, said modified parameter to said plurality of base stations.

3. The method of claim 2 further comprising, after the step of transmitting, by said network load processor, said modified parameter, the step of transmitting, by said plurality of base stations, said modified parameter to said plurality of operating mobile stations.

4. The method of claim 3 further comprising, after the step of transmitting said modified parameter to said plurality of operating mobile stations, the steps of:

determining, by said load capacity monitor, whether said radio telecommunications network is fully loaded;

modifying, by said network load processor, said modified parameter to said original value upon said load capacity monitor determining that said radio telecommunications network is fully loaded;

transmitting, by said network load processor, said modified parameter to said plurality of base stations; and

transmitting, by said plurality of base stations, said modified parameter to said plurality of operating mobile stations.

5. The method of claim 3 wherein said step of modifying, by a network load processor, a parameter affecting allocation of said plurality of base stations includes reducing a size of an active set window for said plurality of base stations.

6. The method of claim 3 wherein said step of modifying, by a network load processor, a parameter affecting allocation of said plurality of base stations includes modifying a set of drop threshold values necessary for a base station to remain within an active set window.

7. The method of claim 3 wherein said step of modifying, by a network load processor, a parameter affecting allocation of said plurality of base stations includes modifying a drop timer value for said plurality of operating mobile stations.

8. A method of dynamically increasing capacity of a fully loaded code division multiple access (CDMA) radio telecommunications network having a plurality of base stations serving a plurality of operating mobile stations on a plurality of channel elements, said radio telecommunications network utilizing a macro-diversity technique to improve radio quality between the base stations and each operating mobile station, said method comprising the steps of:

simultaneously providing a plurality of duplicate radio channel elements from at least one base station to each mobile station operating in the radio telecommunications network;

determining, by a load capacity monitor, whether said radio telecommunications network is fully loaded; and

releasing one of said duplicate channel elements from one of said operating mobile stations, upon determining, by said load capacity monitor, that said telecommunications network is fully loaded.

9. The method of claim 8 wherein said step of releasing one of said duplicate channel elements includes:

modifying, by a network load processor, a parameter affecting allocation of said plurality of base stations serving said plurality of operating mobile stations from an original value in order to reduce use of said plurality of base stations by said plurality of operating mobile stations; and

transmitting, by said network load processor, said modified parameter to said plurality of base stations.

10. The method of claim 9 further comprising, after the step of transmitting, by said network load processor, said modified parameter, the step of transmitting, by said plurality of base stations, said modified parameter to said plurality of operating mobile stations.

11. The method of claim 10 further comprising, after the step of transmitting said modified parameter to said plurality of operating mobile stations, the steps of:

determining, by said load capacity monitor, whether said radio telecommunications network is fully loaded;

modifying, by said network load processor, said modified parameter to said original value upon said load capacity monitor determining that said radio telecommunications network is fully loaded;

transmitting, by said network load processor, said modified parameter to said plurality of base stations; and

transmitting, by said plurality of base stations, said modified parameter to said plurality of operating mobile stations.

12. The method of claim 10 wherein said step of modifying, by a network load processor, a parameter affecting allocation of said plurality of base stations includes reducing a size of an active set window for said plurality of base stations.

13. The method of claim 10 wherein said step of modifying, by a network load processor, a parameter affecting allocation of said plurality of base stations includes modifying a set of drop threshold values necessary for a base station to remain within an active set window.

14. The method of claim 10 wherein said step of modifying, by a network load processor, a parameter affecting allocation of said plurality of base stations includes modifying a drop timer value for said plurality of operating mobile stations.

15. The method of claim 10 further comprising, after the step of releasing one of said duplicate channel elements from one of said operating mobile station, the step of assigning said released channel element to an entering mobile station.

16. A system for dynamically increasing capacity of a fully loaded code division multiple access (CDMA) radio telecommunications network having a plurality of base stations serving a plurality of operating mobile stations on a plurality of channel elements, said radio telecommunications network utilizing a macro-diversity technique to improve radio quality between the base stations and each operating mobile station, said system comprising:

means for simultaneously providing a plurality of duplicate radio channel elements from at least one base station to each mobile station operating in the radio telecommunications network;

means for determining whether said radio telecommunications network is fully loaded; and

means for releasing one of said duplicate channel elements from one of said operating mobile stations when said radio telecommunications network is fully loaded.

17. The system of claim 16 wherein said means for releasing one of said duplicate channel elements includes:

means for modifying a parameter affecting allocation of said plurality of base stations serving said plurality of operating mobile stations in order to reduce use of said plurality of base stations by said plurality of operating mobile stations; and

means for transmitting said modified parameter to said plurality of base stations.

18. The system of claim 17 further comprising means for transmitting said modified parameter from said plurality of base stations to said plurality of operating mobile stations.

19. The system of claim 16 further comprising means for receiving a request for access to said radio telecommunications network from an additional mobile station.

20. The system of claim 19 further comprising means for assigning said released channel element to said additional mobile station.