Modeling of hybrid time-code division multiple access communication systems

• US 6,704,286 B2
• Filed: 12/20/2002
• Issued: 03/09/2004
• Est. Priority Date: 05/28/2002
• Status: Expired due to Fees

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Zeira, Eldad, LaSita, Frank
• Primary Examiner(s): Jung, Min
• Application Number:
  US10/327,303
• Publication Number:
  US 20030223389A1
• Time in Patent Office: 445 Days
• Field of Search: 370/328, 370/329, 370/331, 370/332, 370/335, 370/342, 370/241, 370/252, 455/422, 455/423
• US Class Current: 370/241
• CPC Class Codes: H04W 16/22 Traffic simulation tools or models
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment
• CPC Class Codes: H04W 72/54 based on quality criteria

Abstract

A wireless code division multiple access communication system is modeled. A plurality of snapshots is provided. Each snapshot has a plurality of user equipments (UEs) and base stations. The locations of the UEs in a snapshot vary between the snapshots. For each snapshot, the UEs are assigned to base stations. Resources are sequentially assigned to each UE or groups of UEs and a transmission power level for each UE is determined. For each sequential assignment, an updated transmission power level for any previously assigned UEs is determined. Dropped, served and not admitted (blocked) UEs in the snapshot are determined. Statistics on the performance of the system are gathered using the determined dropped, served and blocked UEs.

Claims

1. A method for modeling a wireless code division multiple access communication system, the method comprising:

providing a plurality of snapshots, each snapshot having a plurality of user equipments (UEs) and base stations, locations of the UEs in each snapshot vary between the snapshots;

for each snapshot;

assigning the UEs to the base stations;

sequentially assigning each UE resources and after the sequential assignment of resources to that UE, determining a transmission power level of that UE;

for each sequential assignment, determining an updated transmission power level for any UEs previously assigned resources;

determining dropped and not admitted UEs of the UEs assigned resources in the snapshot; and

gathering statistics on a performance of the system using the determined dropped and not admitted UEs.

2. The method of claim 1 wherein the determining the transmission power level uses an estimated interference measurement.

3. The method of claim 2 wherein the estimated interference measurement is estimated using the determined transmission power levels of the UEs assigned resources.

4. The method of claim 3 wherein the determined transmission power level uses a pathloss estimate.

5. The method of claim 1 wherein a plurality of resource management algorithms are evaluated and statistics for each algorithm are gathered for all of the snapshots.

6. The method of claim 1 wherein a not admitted UE has insufficient power to meet a desired channel quality after attempting to add the not admitted user equipment to a snapshot.

7. The method of claim 1 wherein a dropped UE has a transmission power limit below a transmission power level required to meet a desired channel quality after another of the UEs is added to a snapshot.

8. A method for modeling a wireless code division multiple access communication system, the method comprising:

providing a plurality of snapshots, each snapshot having a plurality of user equipments (UEs) and base stations, locations of the UEs in each snapshot vary between the snapshots;

for each snapshot;

assigning the UEs to the base stations;

assigning resources sequentially to each group of a plurality of groups of the UEs and after the sequential assignment or resources to each group, determining a transmission power level of each UE in the group, each UE in a group having a low mutual correlation;

for each sequential assignment, determining an updated transmission power level for any UE in one of the groups previously assigned resources;

determining dropped and not admitted UEs of the UEs in the groups assigned resources in the snapshot; and

gathering statistics on a performance of the system using the determined dropped and not admitted UEs.

9. The method of claim 8 wherein the determining the transmission power level uses an estimated interference measurement.

10. The method of claim 9 wherein the estimated interference measurement is estimated using the determined transmission power levels of the UEs assigned resources.

11. The method of claim 10 wherein the determined transmission power level uses a pathloss estimate.

12. The method of claim 8 wherein a plurality of resource management algorithms are evaluated and statistics for each algorithm are gathered for all of the snapshots.

13. The method of claim 8 wherein a not admitted UE has insufficient power to meet a desired channel quality after attempting to add the not admitted UE to a snapshot.

14. The method of claim 8 wherein a dropped UE has a transmission power limit below a transmission power level required to meet a desired channel quality after another of the UEs is added to a snapshot.