Identification of base stations

• US 20070268853A1
• Filed: 05/17/2006
• Published: 11/22/2007
• Est. Priority Date: 05/17/2006
• Status: Active Grant

• Current Assignee: WSOU Investments, LLC (WSOU Holdings, LLC)
• Original Assignee: Alcatel-Lucent USA, Inc. (Nokia Corporation)
• Inventors: Ma, Zhengxiang, Polakos, Paul Anthony
• Granted Patent: US 7,680,075 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04B 1/7083 Cell search, e.g. using a three-step approach
• CPC Class Codes: H04B 2201/70702 Intercell-related aspects
• CPC Class Codes: H04J 13/0029 Gold
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information

Abstract

The identification of wireless communication base stations in a region of high base station density is effected using a specific identification signal pattern transmitted by the base stations. In particular, each base station transmits a signal having a pattern with at least two time phase shifts relative to at least one time benchmark. The combination of these phase shifts allows identification of the transmitting base station. Since a plurality of phase shifts leads to a concomitantly larger number of phase shift combinations, the capacity to identify base stations is enlarged.

Claims

1. A process for wireless communication including a communication link between an user and a base station of a compact cell, said process comprising the steps of identification of said base station by said user and establishment of said communication link wherein said identification comprises transmission by said base station of an identification signal pattern that is characterized by at least two different time phase shifts relative to at least one benchmark time such that the combination of said different phase shifts is employed to make said identification.

2. The process of claim 1 wherein said identification signal comprises a pseudo-random noise pattern.

3. The process of claim 1 wherein said identification signal comprises a scrambling code.

4. The process of claim 1 wherein said base station transmits said identification signal characterized by three different phase shifts relative to said benchmark time.

5. The process of claim 1 wherein said base station transmits said identification signal characterized by two different phase shifts relative to said benchmark time.

6. The process of claim 1 wherein said signal is further characterized by a signal intensity associated with said phase shift.

7. The process of claim 1 wherein the difference in time between said phase shifts constitutes said identification.

8. The process of claim 1 wherein the presence of said phase shifts constitutes said identification.

9. The process of claim 1 wherein said user searches for said phase shifts within the range of −

10 to 10 chips of at least one of said benchmarks.

10. The process of claim 1 wherein said transmission of said identification signal is discontinuous.

11. The process of claim 1 wherein said transmission of said identification signal occurs using a different carrier frequency from the carrier frequency used for said establishment of a communication link.

12. The process of claim 1 wherein the power of said transmission of said identification signal is dynamically controlled.