Sequence generation for cell specific reference signal (CRS)

1. An eNodeB (eNB) comprising:

a sequence generator to:

identify an initialization parameter that is based on a system frame number, the initialization parameter for a pseudo-random sequence with a periodicity greater than one radio frame of a radio signal, wherein the radio frame includes a plurality of subframes;

generate, based at least in part on the initialization parameter, the pseudo-random sequence; and

generate, based at least in part on the pseudo-random sequence, a reference signal; and

a transmitter coupled with the sequence generator, the transmitter to transmit the reference signal in a subframe of the one radio frame.

2. The eNB of claim 1 , wherein the transmitter is further to transmit the reference signal in at least two subframes of the radio frame.

3. The eNB of claim 2 , wherein the transmitter is further to transmit the reference signal in each subframe of the radio frame.

4. The eNB of claim 1 , wherein the initialization parameter is based at least in part on a modular operation of a number of slots in the radio frame.

5. The eNB of claim 1 , wherein the initialization parameter is a first system frame number, the reference signal is a first reference signal, the pseudo-random sequence is a first pseudo-random sequence, and the radio frame is a first radio frame, and the sequence generator is further to:

identify a second system frame number of a second radio frame, the second system frame number different from the first system frame number;

generate a second pseudo-random sequence based at least in part on the second system frame number; and

generate a second reference signal based at least in part on the second pseudo-random sequence; and

the transmitter is further to transmit the second reference signal in the second radio frame.

6. The eNB of claim 1 , wherein the radio frame is a downlink radio frame of a long term evolution (LTE) network.

7. The eNB of claim 1 , wherein the pseudo-random sequence is based at least in part on a length-31 Gold sequence.

8. The eNB of claim 7 , wherein the initialization parameter is based on more than three bits of information in the length-31 Gold sequence.

9. A method comprising:

identifying, at a base station, an initialization parameter for a pseudo-random sequence with a periodicity greater than one radio frame of a radio signal, each radio frame comprising a plurality of subframes and the initialization parameter being based on a system frame number;

generating, at the base station, based at least in part on the initialization parameter, the pseudo-random sequence;

generating, at the base station, a reference signal based at least in part on the pseudo-random sequence; and

transmitting, at the base station, the reference signal in a subframe of the plurality of subframes.

10. The method of claim 9 , further comprising transmitting, at the base station, the reference signal in two subframes of the radio frame.

11. The method of claim 10 , further comprising transmitting, at the base station, the reference signal in each subframe of the radio frame.

12. The method of claim 9 , wherein the initialization parameter is based at least in part on a modular operation, and the modular operation is based at least in part on a number of slots in the radio frame.

13. The method of claim 9 , wherein the initialization parameter is a first system frame number, the reference signal is a first reference signal, the pseudo-random sequence is a first pseudo-random sequence, and the radio frame is a first radio frame, and further comprising:

identifying, at the base station, a second system frame number of a second radio frame, the second system frame number different from the first system frame number;

generating, at the base station, a second pseudo-random sequence based at least in part on the second system frame number;

generating, at the base station, a second reference signal based at least in part on the second pseudo-random sequence; and

transmitting, at the base station, the second reference signal in the second radio frame.

14. The method of claim 9 , wherein the radio frame is a downlink radio frame of a long term evolution (LTE) network.

15. The method of claim 9 , wherein the pseudo-random sequence is based at least in part on a length-31 Gold sequence.

16. The method of claim 15 , wherein the initialization parameter is defined in the length-31 Gold sequence by more than three bits of information.

17. One or more non-transitory computer readable media comprising instructions, when executed by one or more processors, cause a user equipment of a long term evolution (LTE) network to:

identify an initialization parameter for a pseudo-random sequence with a periodicity greater than one LTE radio frame, each LTE radio frame comprising a plurality of subframes received from an enhanced NodeB (eNB) of the LTE network and the initialization parameter based on a system frame number;

generate, based at least in part on the initialization parameter, the pseudo-random sequence;

generate, based at least in part on the pseudo-random sequence, a cell-specific reference signal (CRS); and

identify the CRS in a subframe of an LTE radio frame received from the eNB.

18. The one or more non-transitory computer readable media of claim 17 , wherein the initialization parameter is modulated by a number of slots in the LTE radio frame.

19. The one or more non-transitory computer readable media of claim 17 , wherein the initialization parameter is a first system frame number, the reference signal is a first reference signal, the pseudo-random sequence is a first pseudo-random sequence, and the LTE radio frame is a first LTE radio frame, and the instructions, when executed, further cause the user equipment to:

identify a second system frame number of a second LTE radio frame received from the base station, the second system frame number different from the first system frame number;

generate a second pseudo-random sequence based at least in part on the second system frame number;

generate a second reference signal based at least in part on the second pseudo-random sequence; and

identify the second reference signal in the second LTE radio frame.