Base station for code group synchronization

• US 7,095,723 B2
• Filed: 02/13/2002
• Issued: 08/22/2006
• Est. Priority Date: 05/28/1999
• Status: Expired due to Fees

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Sezgin, Nadir, Ozluturk, Fatih M.
• Primary Examiner(s): Nguyen, Chau
• Assistant Examiner(s): Moore, Ian N.
• Application Number:
  US10/074,641
• Publication Number:
  US 20020097705A1
• Time in Patent Office: 1,651 Days
• Field of Search: 370/324, 370/209, 370/350, 375/145
• US Class Current: 370/324
• 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 base station is capable of communicating in a time division duplex using code division multiple access format. The base station transmits a primary synchronization signal and secondary synchronization signals for synchronization purposes. A primary synchronization signal is transmitted in a selected time slot in a primary synchronization channel. The primary synchronization channel uses a plurality of time slots for communication. Each of a plurality of combinations of N code groups and the plurality of time slots is associated with a unique combination of secondary synchronization signals from a set of secondary synchronization signals, which does not exceed (log₂ N)+1 in number. Selected secondary synchronization signals are transmitted out of a set of secondary synchronization signals. The selected secondary signals are associated with one of the N code groups. The one group is associated with the base station.

Claims

1. A base station capable of communicating in a time division duplex using code division multiple access format, the base station transmitting a primary synchronization signal and secondary synchronization signals for synchronization purposes, the base station comprising:

means for transmitting the primary synchronization signal in a selected time slot in a primary synchronization channel, the primary synchronization channel using a plurality of time slots for communication;

means for associating each of a plurality of combinations of N code groups and the plurality of time slots with a unique combination of secondary synchronization signals from a set of secondary synchronization signals which does not exceed (log₂ N)+1 in number; and

means for transmitting selected secondary synchronization signals, the selected secondary synchronization signals associated with one of the N code groups, the one group associated with the base station.

2. The base station of claim 1 wherein the secondary synchronization signals are transmitted either on an in-phase or quadrature carrier.

3. The base station of claim 1 wherein the associating means associates each primary synchronization channel time slot with the unique combination of secondary synchronization signals.

4. The base station of claim 1 further comprising a secondary synchronization spread spectrum signal generator for producing each of the transmitted secondary synchronization signals.

5. A base station capable of communicating in a time division duplex using code division multiple access format, the base station transmitting a primary synchronization signal and secondary synchronization signals for synchronization purposes, the base station comprising:

a primary synchronization spread spectrum signal generator and an antenna for transmitting the primary synchronization signal in a selected time slot in a primary synchronization channel, the primary synchronization channel using a plurality of time slots for communication;

a plurality of secondary synchronization spread spectrum signal generators and the antenna for transmitting selected secondary synchronization signals out of a set of secondary synchronization signals, the selected secondary synchronization signals associated with one of the N code groups associated with the base station, each of a plurality of combinations of the N code groups and the plurality of time slots is associated with a unique combination of the secondary synchronization signals from the set of secondary signals which does not exceed (log₂ N)+1 in number.

6. The base station of claim 5 wherein the secondary synchronization signals are transmitted either on an in-phase or quadrature carrier.

7. The base station of claim 5 wherein each primary synchronization channel time slot is associated with the unique combination of secondary synchronization signals.