Secondary synchronization sequences for cell group detection in a cellular communications system

摘要

Timing parameters and an identity of a particular one of a number of cell groups are indicated in a signal transmitted in a cellular communication system having a radio frame in a physical layer, the radio frame comprising a number of time slots. In a known one of the time slots, a synchronization signal, S1, is transmitted that comprises a pair of sequences, Si%,Sj% (Si%≠Sj% arranged in a first ordering. In another known one of the time slots, a synchronization signal, S2 is transmitted that comprises the pair of sequences, Si%,Sj% arranged in a second ordering. The selected pair of sequences is uniquely identified with the particular cell group, and the first ordering of the sequences is used only for transmission in the known one of the time slots, and the second ordering of the sequences is used only for transmission in said another known one of the time slots.

主权项

1. A method of indicating an identity of a particular cell group from a number, M, of possible cell groups in a cellular communication system, the method comprising:
identifying a first sequence and a second sequence from among a group of Nseq different sequences, wherein a sequence pair comprising the first sequence and the second sequence is uniquely associated with one of M possible cell groups; generating a first synchronization signal, the first synchronization signal comprising plural elements of the first sequence that are interleaved with plural elements of the second sequence according to a first ordering, alternating each of the plural elements of the first sequence with each of the plural elements of the second sequence, such that at least one element of the first sequence occurs before a corresponding element of the second sequence in the first synchronization signal; transmitting, in a first time slot of a radio frame, the first synchronization signal; generating a second synchronization signal, the second synchronization signal comprising plural elements of the first sequence that are interleaved with plural elements of the second sequence according to a second ordering, alternating each of the plural elements of the first sequence with each of the plural elements of the second sequence, such that at least one element of the second sequence occurs before a corresponding element of the first sequence in the second synchronization signal; and transmitting, in a second time slot of the radio frame, the second synchronization signal.