Method and apparatus for synchronization in an OFDMA evolved UTRA wireless communication system
AssigneeInterDigital Technology Corporation
InventorsGuodong Zhang, Kyle Jung-Lin Pan, Allan Yingming Tsai
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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.
Claims20
A wireless transmit/receive unit (WTRU) comprising:
- circuitry configured to receive at least a first primary synchronization signal out of a plurality of primary synchronization signals;
- wherein each primary synchronization signal is received in an orthogonal frequency division multiple access (OFDMA) symbol within a transmission time interval;
- wherein the primary synchronization signals are received over a fixed number of subcarriers at a center of a system bandwidth;
- wherein the circuitry is further configured to receive the at least one first primary synchronization signal over the fixed number of subcarriers at a center of a transmission bandwidth for any of a plurality of different system bandwidths;
- and
- the circuitry is further configured, based on a received timing of the at least first primary synchronization signal, to receive system information in at least one OFDM symbol next in time to the OFDM symbol of a second primary synchronization signal out of the plurality of primary synchronization signals;
- wherein the received system information is received in the fixed number of subcarriers at the center of the system bandwidth;
- wherein the system information includes an indication of the system bandwidth and an indication of a number of transmission antennas of a base station, wherein the circuitry is further configured to process received data based on the number of transmission antennas of the base station.
A method implemented in a wireless transmit/receive unit (WTRU), the method comprising:
- receiving at least a first primary synchronization signal out of a plurality of primary synchronization signals;
- wherein each primary synchronization signal is received in an orthogonal frequency division multiple access (OFDMA) symbol within a transmission time interval;
- wherein the primary synchronization signals are received over a fixed number of subcarriers at a center of a system bandwidth;
- wherein the at least one first primary synchronization signal is received over the fixed number of subcarriers at a center of a transmission bandwidth for any of a plurality of different system bandwidths;
- based on a received timing of the at least first primary synchronization signal, receiving system information in at least one OFDM symbol next in time to the OFDM symbol of a second primary synchronization signal out of the plurality of primary synchronization signals;
- wherein the received system information is received in the fixed number of subcarriers at the center of the system bandwidth;
- wherein the system information includes an indication of the system bandwidth and an indication of a number of transmission antennas of a base station;
- and
- processing received data based on the number of transmission antennas of the base station.
Dependencies are inferred from the claim text.