LOCATION ASSISTED CELL SEARCH AND EMERGENCY CALL OPTIMIZATION

• US 20080167052A1
• Filed: 01/08/2008
• Published: 07/10/2008
• Est. Priority Date: 01/08/2007
• Status: Abandoned Application

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Wang, Peter S., Wang, Jin, Olvera-Hernandez, Ulises
• Application Number:
  US11/971,131
• Publication Number:
  US 20080167052A1
• Time in Patent Office: Days
• US Class Current: 455/456.6
• CPC Class Codes: H04J 11/0069 Cell search, i.e. determining cell identity [cell-ID] design of multiplexing codes H04J13/00; processing access restriction or access information H04W48/16; discovery of network devices for network data management H04W8/005; sounding signals for channel estimation H04L25/0226; structure of reference signals in multicarrier modulation systems H04L27/2613; frame, time or carrier synchronisation in multicarrier modulation systems H04L27/2655
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management

Abstract

Current position information for a user equipment is obtained and is used to assist in cell search and to optimize calls requiring precision positioning made by the user equipment. The position information can be normalized to provide quicker lookup during cell search.

Claims

1. A User Equipment (UE) configured for optimization of the cell search process comprising:

an antenna for receiving at least one position signal;

a processor configured to determine a position of the UE based on said position signal; and

a memory for storing said determined position;

wherein said processor uses said stored position to perform a cell search.

2. The UE of claim 1, wherein said stored position is combined with at least one other parameter to generate a position value.

3. The UE of claim 1, wherein said at least one other parameter comprises at least one of a cell identification, public land mobile network identification, carrier frequency, scrambling code and timing offset.

4. The UE of claim 1, wherein said processor receives the current position of the UE on a periodic basis.

5. The UE of claim 1, wherein said processor determines the current position of the UE based on an event.

6. The UE of claim 1, wherein said processor normalizes the position information.

7. The UE of claim 6, wherein said processor performs the normalization based on a mapping table and a mapping area inclusion test.

8. The UE of claim 1, wherein said processor is configured to determine whether the UE is within a predefined area, comprising:

normalizing said position of the UE; and

comparing said normalized position with the boundaries of said predefined area.

9. A method for optimization of the cell search process within a user equipment (UE) comprising:

receiving at least one position signal;

determine a position of the UE based on said position signal;

storing said determined position; and

retrieving and using said stored position to perform a cell search.

10. The method of claim 9, further comprising combining said stored position with at least one other parameter to generate a position value.

11. The method of claim 10, wherein said at least one other parameter comprises at least one of a cell identification, public land mobile network identification, carrier frequency, scrambling code and timing offset.

12. The method of claim 9, further comprising receiving said position signal on a periodic basis.

13. The method of claim 9, further comprising determining a current position of the UE based on an event.

14. The method of claim 9, further comprising normalizing said stored position.

15. The method of claim 14, wherein said normalization is based on a mapping table and a mapping area inclusion test.

16. The method of claim 9, further comprising determining whether the UE is within a predefined area, comprising:

normalizing said determined position of the UE; and

comparing said normalized position with the boundaries of said predefined area.