Secondary synchronization signal mapping

An apparatus of a user equipment (UE), the apparatus comprising:

• processing circuitry, the processing circuitry configured to:
• decode a primary synchronization signal (PSS) to obtain physical layer identity, the PSS received from an evolved Node-B (eNB);
• decode a secondary synchronization signal (SSS) to obtain a physical-layer cell-identity group from two sequences, each of the two sequences taken from a set of N sequences indexed by an index pair,
• determine a physical-layer cell identity (PCI) based on the physical layer identity and the physical-layer cell-identity group;
• and
• perform time and frequency synchronization with a cell of the eNB based on the PSS and the SSS;
• and
• memory, the memory coupled to the processing circuitry and configured to store the PCI.

An apparatus of an Evolved Node-B (eNB), the apparatus comprising:

• processing circuitry, the processing circuitry configured to:
• generate a primary synchronization signal (PSS) to include a physical layer identity;
• generate a secondary synchronization signal (SSS) to include a physical-layer cell-identity group using two sequences, each of the two sequences taken from a set of N sequences indexed by an index pair, wherein each index in the index pair ranges from 0 to N−1;
• and
• encode one or more downlink subframes for transmission to a user equipment (UE) to include the PSS and the SSS at fixed positions of the subframes;
• and
• memory, the memory coupled to the processing circuitry and configured to store the set of N sequences.

A non-transitory computer readable storage device including instructions stored thereon, which when executed by one or more processors of a User Equipment (UE), cause the UE to perform operations to:

• decode a primary synchronization signal (PSS) to obtain physical layer identity, the PSS received from an evolved Node-B (eNB);
• decode a secondary synchronization signal (SSS) to obtain a physical-layer cell-identity group from two sequences, each of the two sequences taken from a set of N sequences indexed by an index pair, wherein each index in the index pair is an integer ranging from 0 to N−1;
• determine a physical-layer cell identity (PCI) based on the physical layer identity and the physical-layer cell-identity group;
• and
• perform time and frequency synchronization with a cell of the eNB based on the PSS and the SSS.