User equipment for synchronizing to a TDD base station

• US 20060280136A1
• Filed: 08/17/2006
• Published: 12/14/2006
• Est. Priority Date: 05/22/2000
• Status: Active Grant

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Ozluturk, Fatih M., Sezgin, Nadir
• Granted Patent: US 7,596,105 B2
• Time in Patent Office: Days
• US Class Current: 370/294
• CPC Class Codes: H04B 1/70735 Code identification H04B1/7083 takes precedence
• CPC Class Codes: H04B 1/70752 Partial correlation
• CPC Class Codes: H04B 1/7083 Cell search, e.g. using a three-step approach
• CPC Class Codes: H04B 1/7093 Matched filter type
• CPC Class Codes: H04B 2201/70701 featuring pilot assisted reception
• CPC Class Codes: H04B 2201/70702 Intercell-related aspects
• CPC Class Codes: H04L 27/2053 using more than one carrier, e.g. carriers with different phases
• CPC Class Codes: H04W 56/00 Synchronisation arrangements
• CPC Class Codes: H04W 74/04 Scheduled access hybrid access H04W74/02
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A time division duplex (TDD) user equipment (UE) is configured to synchronize to a TDD base station. The UE includes a receiver configured to receive a primary synchronization code along with a plurality of secondary synchronization codes from a TDD base station. The TDD base station is associated with having a code group out of N code groups. The plurality of secondary synchronization codes number less than (log₂N)+1 and are quadrature phase shift keying modulated. The UE also includes a corresponding matched filter to each of the received secondary synchronization codes. The UE is configured to identify the code group of the TDD base station by the received plurality of secondary synchronization.

Claims

1. A time division duplex (TDD) user equipment (UE) configured to synchronize to a TDD base station, the UE comprising:

a receiver configured to receive a primary synchronization code along with a plurality of secondary synchronization codes from a TDD base station, the TDD base station associated with having a code group out of N code groups, the plurality of secondary synchronization codes numbering less than (log₂N)+1 and the secondary synchronization codes being quadrature phase shift keying modulated; and

a corresponding matched filter to each of the received secondary synchronization codes; and

wherein the UE is configured to identify the code group of the TDD base station by the received plurality of secondary synchronization.

2. The TDD user equipment of claim 1 wherein each of the secondary synchronization codes correspond to a row of a Hadamard matrix.

3. The TDD user equipment of claim 1 wherein the value of N is 32.

4. The TDD user equipment of claim 3 wherein the 32 code groups are divided into multiple code groups and the UE is configured for each of the multiple code groups to identify using a different set of secondary synchronization codes.

5. The TDD user equipment of claim 4 wherein the 32 code groups have a lower half having codes 1-16 and an upper half having codes 17-32.