Cell search method, forward link frame transmission method, apparatus using the same and forward link frame structure

A user equipment (UE), comprising:

• a circuitry which is configured to:
• cause the UE to receive a first set of Orthogonal Frequency Division Multiplexing (OFDM) symbols including a first OFDM symbol and a second OFDM symbol during a first time period, the first OFDM symbol comprises a first primary synchronization signal and the second OFDM symbol comprises a first secondary synchronization signal;
• cause the UE to receive a second set of OFDM symbols including a third OFDM symbol and a fourth OFDM symbol during a second time period, the third OFDM symbol comprises the first primary synchronization signal and the fourth OFDM symbol comprises a second secondary synchronization signal;
• determine a first identifier based on the first primary synchronization signal;
• determine a second identifier based on one of the first secondary synchronization signal and the second secondary synchronization signal;
• and
• determine a cell identifier based on the first identifier and the second identifier,
• wherein:
• the first primary synchronization signal occupies a first set of subcarriers ranging from a first subcarrier to a second subcarrier, the first secondary synchronization signal occupies a second set of subcarriers ranging from a third subcarrier to a fourth subcarrier, the first subcarrier is identical to the third subcarrier in frequency, and the second subcarrier is identical to the fourth subcarrier in frequency,
• the first OFDM symbol comprising the first primary synchronization signal and the second OFDM symbol comprising the first secondary synchronization signal are last two OFDM symbols of the first time period, and
• the third OFDM symbol comprising the first primary synchronization signal and the fourth OFDM symbol comprising the second secondary synchronization signal are last two OFDM symbols of the second time period.

A communication device for a user equipment (UE), the communication device comprising:

• a circuitry which is configured to:
• cause the UE to receive a first set of Orthogonal Frequency Division Multiplexing (OFDM) symbols including a first OFDM symbol and a second OFDM symbol during a first time period, the first OFDM symbol comprises a first primary synchronization signal and the second OFDM symbol comprises a first secondary synchronization signal;
• cause the UE to receive a second set of OFDM symbols including a third OFDM symbol and a fourth OFDM symbol during a second time period, the third OFDM symbol comprises the first primary synchronization signal and the fourth OFDM symbol comprises a second secondary synchronization signal;
• determine a first identifier based on the first primary synchronization signal;
• determine a second identifier based on one of the first secondary synchronization signal and the second secondary synchronization signal;
• and
• determine a cell identifier based on the first identifier and the second identifier,
• wherein:
• the first primary synchronization signal occupies a first set of subcarriers ranging from a first subcarrier to a second subcarrier, the first secondary synchronization signal occupies a second set of subcarriers ranging from a third subcarrier to a fourth subcarrier, the first subcarrier is identical to the third subcarrier in frequency, and the second subcarrier is identical to the fourth subcarrier in frequency,
• the first OFDM symbol comprising the first primary synchronization signal and the second OFDM symbol comprising the first secondary synchronization signal are last two OFDM symbols of the first time period, and
• the third OFDM symbol comprising the first primary synchronization signal and the fourth OFDM symbol comprising the second secondary synchronization signal are last two OFDM symbols of the second time period.