METHOD AND APPARATUS FOR SYNCHRONIZATION IN AN OFDMA EVOLVED UTRA WIRELESS COMMUNICATION SYSTEM
First Claim
1. A user equipment for performing cell search in a long term evolution (LTE) network comprising:
- a receiver and a processor configured to detect at least one primary synchronization signal and at least one secondary synchronization signal; and
the processor further configured in response to the detected at least one primary synchronization signal and the at least one secondary synchronization signal, to determine a radio frame timing and an identity of a cell that transmitted the primary synchronization signal and the secondary synchronization signal, wherein primary synchronization signals and secondary synchronization signals are received in a fixed number of subcarriers at a center of a system bandwidth, and wherein a transmission time interval (TTI) of one of the radio frames includes a primary synchronization signal and a secondary synchronization signal in respective orthogonal frequency division multiplex (OFDM) symbols of the TTI.
0 Assignments
0 Petitions
Accused Products
Abstract
A method and apparatus for synchronization in an orthogonal frequency division multiple access (OFDMA) evolved universal terrestrial radio access (E-UTRA) system including at least one base station and a plurality of wireless transmit/receive units (WTRUs). A secondary synchronization channel (S-SCH) symbol is generated to include cell-specific information. The S-SCH symbol is mapped to the center of the available bandwidth of the system. In one embodiment, the S-SCH symbol is transmitted on different subcarriers at different sectors in the system. In another embodiment, the S-SCH symbol is transmitted on the same subcarriers at different sectors in the system.
-
Citations
17 Claims
-
1. A user equipment for performing cell search in a long term evolution (LTE) network comprising:
-
a receiver and a processor configured to detect at least one primary synchronization signal and at least one secondary synchronization signal; and the processor further configured in response to the detected at least one primary synchronization signal and the at least one secondary synchronization signal, to determine a radio frame timing and an identity of a cell that transmitted the primary synchronization signal and the secondary synchronization signal, wherein primary synchronization signals and secondary synchronization signals are received in a fixed number of subcarriers at a center of a system bandwidth, and wherein a transmission time interval (TTI) of one of the radio frames includes a primary synchronization signal and a secondary synchronization signal in respective orthogonal frequency division multiplex (OFDM) symbols of the TTI. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A method for use by a user equipment for performing cell search in a long term evolution (LTE) network, the method comprising:
-
detecting, by the user equipment, at least one primary synchronization signal and at least one secondary synchronization signal; and in response to the detected at least one primary synchronization signal and the at least one secondary synchronization signal, determining a radio frame timing and an identity of a cell that transmitted the primary synchronization signal and the secondary synchronization signal, wherein primary synchronization signals and secondary synchronization signals are received in a fixed number of subcarriers at a center of a system bandwidth, and wherein a transmission time interval (TTI) of one of the radio frames includes a primary synchronization signal and a secondary synchronization signal in respective orthogonal frequency division multiplex (OFDM) symbols of the TTI. - View Dependent Claims (8, 9, 10, 11, 12)
-
-
13. An eNodeB in a long term evolution (LTE) network comprising:
a transmitter operatively coupled to a processor and configured to transmit a primary synchronization signal and a secondary synchronization signal in a transmission time interval (TTI) of a radio frame, wherein an identity of a cell transmitting the primary synchronization signal and the secondary synchronization signal is determinable from the transmitted primary synchronization signal and secondary synchronization signal, wherein a frame timing of the radio frame is determinable from the transmitted primary synchronization signal and secondary synchronization signal, and wherein the primary synchronization signal and the secondary synchronization signal are transmitted in a same fixed number of subcarriers at a center of a system bandwidth of the cell and the primary synchronization signal and the secondary synchronization signal are transmitted in respective orthogonal frequency division multiplex (OFDM) symbols of the TTI. - View Dependent Claims (14, 15, 16, 17)
Specification