Transmission of synchronization signals

1. A base station operable to encode a primary synchronization signal for transmission to a user equipment (UE), the base station comprising:

one or more processors configured to:

identify, at the base station, a sequence d(n) for a primary synchronization signal, wherein:

the sequence d(n) is defined by: d(n)=1−2s(n);

s(n) is a maximum run length sequence (m-sequence); and

s(n) is provided as s(n+7)=(s(n+4)+s(n)) mod 2, where 0≤n≤127;

generate, at the base station, the primary synchronization signal based on the sequence d(n), wherein to generate the primary synchronization signal comprises:

modulate the sequence d(n) to form a modulated sequence;

multiply the modulated sequence with an alternating sequence of {+1, +j};

perform a discrete Fourier transform (DFT) operation to map the modulated sequence to subcarriers in a frequency domain; and

perform an inverse DFT operation to the modulated sequence to obtain synchronization signal (SS) orthogonal frequency division multiplexing (OFDM) symbols in a time domain;

encode, at the base station, the primary synchronization signal for transmission to the UE; and

a memory interface configured to retrieve from a memory the primary synchronization signal.

2. The base station of claim 1 , further comprising a transceiver configured to transmit the primary synchronization signal to the UE.

3. The base station of claim 1 , wherein a sequence of symbols for the sequence d(n) that comprises the primary synchronization signal is mapped to a range of subcarrier numbers k relative to a start of a synchronization signal block.

4. The base station of claim 3 , wherein the sequence of symbols for the sequence d(n) that comprises the primary synchronization signal includes 126 symbols.

5. The base station of claim 3 , wherein the range of subcarrier numbers k that include the sequence of symbols for the sequence d(n) is between 56 and 182.

6. At least one non-transitory machine readable storage medium having instructions embodied thereon for encoding a primary synchronization signal for transmission to a user equipment (UE), the instructions when executed by one or more processors of a base station perform the following:

identifying, at the base station, a sequence d(n) for a primary synchronization signal, wherein:

the sequence d(n) is defined by: d(n)=1−2s(n);

s(n) is a maximum run length sequence (m-sequence); and

s(n) is provided as s(n+7)=(s(n+4)+s(n)) mod 2, where 0≤n≤127;

generating, at the base station, the primary synchronization signal based on the sequence d(n), wherein generating the primary synchronization signal comprises:

modulating the sequence d(n) to form a modulated sequence;

multiplying the modulated sequence with an alternating sequence of {+1, +j};

performing a discrete Fourier transform (DFT) operation to map the modulated sequence to subcarriers in a frequency domain; and

performing an inverse DFT operation to the modulated sequence to obtain synchronization signal (SS) orthogonal frequency division multiplexing (OFDM) symbols in a time domain; and

encoding, at the base station, the primary synchronization signal for transmission to the UE.

7. The at least one non-transitory machine readable storage medium of claim 6 , wherein a sequence of symbols for the sequence d(n) that comprises the primary synchronization signal is mapped to a range of subcarrier numbers k relative to a start of a synchronization signal block.

8. The at least one non-transitory machine readable storage medium of claim 7 , wherein the sequence of symbols for the sequence d(n) that comprises the primary synchronization signal includes 126 symbols.

9. The at least one non-transitory machine readable storage medium of claim 7 , wherein the range of subcarrier numbers k that include the sequence of symbols for the sequence d(n) is between 56 and 182.

10. A method for a base station to encode a primary synchronization signal for transmission to a user equipment (UE), the method comprising:

identifying, at the base station, a sequence d(n) for a primary synchronization signal, wherein:

the sequence d(n) is defined by: d(n)=1−2s(n);

s(n) is a maximum run length sequence (m-sequence); and

s(n) is provided as s(n+7)=(s(n+4)+s(n)) mod 2, where 0≤n≤127;

generating, at the base station, the primary synchronization signal based on the sequence d(n), wherein generating the primary synchronization signal comprises:

modulating the sequence d(n) to form a modulated sequence;

multiplying the modulated sequence with an alternating sequence of {+1, +j};

performing a discrete Fourier transform (DFT) operation to map the modulated sequence to subcarriers in a frequency domain; and

performing an inverse DFT operation to the modulated sequence to obtain synchronization signal (SS) orthogonal frequency division multiplexing (OFDM) symbols in a time domain; and

encoding, at the base station, the primary synchronization signal for transmission to the UE.

11. The method of claim 10 , wherein a sequence of symbols for the sequence d(n) that comprises the primary synchronization signal is mapped to a range of subcarrier numbers k relative to a start of a synchronization signal block.

12. The method of claim 11 , wherein the sequence of symbols for the sequence d(n) that comprises the primary synchronization signal includes 126 symbols.

13. The method of claim 11 , wherein the range of subcarrier numbers k that include the sequence of symbols for the sequence d(n) is between 56 and 182.