Techniques for mitigating interference for transmissions of a periodic multi-beam discovery reference signal

1. A method for wireless communication at a base station, comprising:

transmitting, on a plurality of beams, a discovery reference signal (DRS) in a first instance of a periodic multi-beam DRS, wherein the DRS in the first instance of the periodic multi-beam DRS comprises a synchronization signal sequence encoded based at least in part on a first code; and

transmitting, on the plurality of beams, the DRS in a second instance of the periodic multi-beam DRS, wherein the DRS in the second instance of the periodic multi-beam DRS comprises the synchronization signal sequence encoded based at least in part on a second code that is different form the first code.

2. The method of claim 1 , further comprising:

transmitting the DRS on a beam in each instance of a plurality of instances of the periodic multi-beam DRS, wherein the plurality of instances of the periodic multi-beam DRS comprises the first instance of the periodic multi-beam DRS and the second instance of the periodic multi-beam DRS.

3. The method of claim 2 , wherein the first instance of the periodic multi-beam DRS and the second instance of the periodic multi-beam DRS are consecutive instances based at least in part on the plurality of beams.

4. The method of claim 1 , further comprising:

transmitting the DRS on a beam in each instance of a plurality of instances of the periodic multi-beam DRS, wherein the plurality of instances of the periodic multi-beam DRS comprises the first instance of the periodic multi-beam DRS, and each instance in the plurality of instances comprises the DRS with the synchronization signal sequence encoded based at least in part on the first code.

5. The method of claim 4 , wherein the plurality of instances of the periodic multi-beam DRS comprise consecutive instances based at least in part on the plurality of beams.

6. The method of claim 1 , further comprising:

transmitting information identifying at least one of the first code or the second code, wherein the first code or the second code comprises at least one of: a scrambling code, an orthogonal cover code, or a combination thereof; and

performing at least one random access procedure with at least one user equipment (UE) based at least in part on the periodic multi-beam DRS.

7. The method of claim 1 , further comprising:

selecting the first code based at least in part on a set of one or more information bits to be conveyed by the DRS on a beam in the first instance of the periodic multi-beam DRS, wherein the set of one or more information bits comprise at least one of: at least a part of a cell identifier, at least a portion of timing information for a cell, at least a part of a system frame number, or a combination thereof.

8. A method for wireless communication at a user equipment (UE), comprising:

receiving on a beam of a plurality of beams, from a base station, a discovery reference signal (DRS) in at least a first instance or a second instance of a periodic multi-beam DRS, wherein the DRS comprises a synchronization signal sequence encoded based at least in part on a first code, and the second instance of the periodic multi-beam DRS comprises the DRS with the synchronization signal sequence encoded based at least in part on a second code that is different from the first code; and

decoding the synchronization signal sequence based at least in part on the first code.

9. The method of claim 8 , further comprising:

receiving the DRS on the beam, from the base station, in each instance of a plurality of instances of the periodic multi-beam DRS, wherein the plurality of instances of the periodic multi-beam DRS comprises the first instance of the periodic multi-beam DRS and the second instance of the periodic multi-beam DRS;

decoding the synchronization signal sequence based at least in part on the second code; and

combining the DRS across multiple instances of the plurality of instances of the periodic multi-beam DRS.

10. The method of claim 9 , wherein the first instance of the periodic multi-beam DRS and the second instance of the periodic multi-beam DRS are consecutive instances based at least in part on the plurality of beams.

11. The method of claim 8 , further comprising:

receiving the DRS on the beam, from the base station, in each instance of a plurality of instances of the periodic multi-beam DRS, wherein the plurality of instances of the periodic multi-beam DRS comprises the first instance of the periodic multi-beam DRS, and each instance in the plurality of instances comprises the DRS with the synchronization signal sequence encoded based at least in part on the first code; and

combining the DRS across multiple instances of the plurality of instances of the periodic multi-beam DRS.

12. The method of claim 11 , wherein the plurality of instances of the periodic multi-beam DRS comprise consecutive instances based at least in part on the plurality of beams.

13. The method of claim 8 , further comprising:

identifying at least one of the first code or the second code based at least in part on: first information stored at the UE, second information received from the base station, third information received from a second base station, blind detection, or a combination thereof, wherein the first code or the second code comprises at least one of: a scrambling code, an orthogonal cover code, or a combination thereof.

14. The method of claim 8 , further comprising:

blindly detecting the first code; and

inferring a set of one or more information bits based at least in part on the first code, wherein the set of one or more information bits comprise at least one of: at least a part of a cell identifier, at least a portion of timing information for a cell, at least a part of a system frame number, or a combination thereof.

15. The method of claim 8 , further comprising:

performing a random access procedure with the base station based at least in part on the DRS.

16. An apparatus for wireless communication at a base station, comprising:

a processor,

memory coupled with the processor; and

instructions stored in the memory and executable by the processor to cause the apparatus to:

transmit, on a plurality of beams, a discovery reference signal (DRS) in a first instance of a periodic multi-beam DRS, wherein the DRS in the first instance of the periodic multi-beam DRS comprises a synchronization signal sequence encoded based at least in part on a first code; and

transmit, on the plurality of beams, the DRS in a second instance of the periodic multi-beam DRS, wherein the DRS in the second instance of the periodic multi-beam DRS comprises the synchronization signal sequence encoded based at least in part on a second code that is different form the first code.

17. The apparatus of claim 16 , wherein the instructions are further executable by the processor to cause the apparatus to:

transmit the DRS on a beam in each instance of a plurality of instances of the periodic multi-beam DRS, wherein the plurality of instances of the periodic multi-beam DRS comprises the first instance of the periodic multi-beam DRS and the second instance of the periodic multi-beam DRS.

18. The apparatus of claim 17 , wherein the first instance of the periodic multi-beam DRS and the second instance of the periodic multi-beam DRS are consecutive instances based at least in part on the plurality of beams.

19. The apparatus of claim 16 , wherein the instructions are further executable by the processor to cause the apparatus to:

transmit the DRS on a beam in each instance of a plurality of instances of the periodic multi-beam DRS, wherein the plurality of instances of the periodic multi-beam DRS comprises the first instance of the periodic multi-beam DRS, and each instance in the plurality of instances comprises the DRS with the synchronization signal sequence encoded based at least in part on the first code.

20. The apparatus of claim 19 , wherein the plurality of instances of the periodic multi-beam DRS comprise consecutive instances based at least in part on the plurality of beams.

21. The apparatus of claim 16 , wherein the instructions are further executable by the processor to cause the apparatus to:

transmit information identifying at least one of the first code or the second code, wherein the first code or the second code comprises at least one of: a scrambling code, an orthogonal cover code, or a combination thereof; and

perform at least one random access procedure with at least one user equipment (UE) based at least in part on the periodic multi-beam DRS.

22. The apparatus of claim 16 , wherein the instructions are further executable by the processor to cause the apparatus to:

select the first code based at least in part on a set of one or more information bits to be conveyed by the DRS on a beam in the first instance of the periodic multi-beam DRS, wherein the set of one or more information bits comprise at least one of: at least a part of a cell identifier, at least a portion of timing information for a cell, at least a part of a system frame number, or a combination thereof.

23. A apparatus for wireless communication at a user equipment (UE), comprising:

receive on a beam of a plurality of beams, from a base station, a discovery reference signal (DRS) in at least a first instance or a second instance of a periodic multi-beam DRS, wherein the DRS comprises a synchronization signal sequence encoded based at least in part on a first code, and the second instance of the periodic multi-beam DRS comprises the DRS with the synchronization signal sequence encoded based at least in part on a second code that is different from the first code; and

decode the synchronization signal sequence based at least in part on the first code.

24. The apparatus of claim 23 , wherein the instructions are further executable by the processor to cause the apparatus to:

receive the DRS on the beam, from the base station, in each instance of a plurality of instances of the periodic multi-beam DRS, wherein the plurality of instances of the periodic multi-beam DRS comprises the first instance of the periodic multi-beam DRS and the second instance of the periodic multi-beam DRS;

decode the synchronization signal sequence based at least in part on the second code; and

combine the DRS across multiple instances of the plurality of instances of the periodic multi-beam DRS.

25. The apparatus of claim 24 , wherein the first instance of the periodic multi-beam DRS and the second instance of the periodic multi-beam DRS are consecutive instances based at least in part on the plurality of beams.

26. The apparatus of claim 23 , wherein the instructions are further executable by the processor to cause the apparatus to:

receive the DRS on the beam, from the base station, in each instance of a plurality of instances of the periodic multi-beam DRS, wherein the plurality of instances of the periodic multi-beam DRS comprises the first instance of the periodic multi-beam DRS, and each instance in the plurality of instances comprises the DRS with the synchronization signal sequence encoded based at least in part on the first code; and

combine the DRS across multiple instances of the plurality of instances of the periodic multi-beam DRS.

27. The apparatus of claim 26 , wherein the plurality of instances of the periodic multi-beam DRS comprise consecutive instances based at least in part on the plurality of beams.

28. The apparatus of claim 23 , wherein the instructions are further executable by the processor to cause the apparatus to:

identify at least one of the first code or the second code based at least in part on: first information stored at the UE, second information received from the base station, third information received from a second base station, blind detection, or a combination thereof, wherein the first code or the second code comprises at least one of: a scrambling code, an orthogonal cover code, or a combination thereof.

29. The apparatus of claim 23 , wherein the instructions are further executable by the processor to cause the apparatus to:

blindly detect the first code; and

infer a set of one or more information bits based at least in part on the first code, wherein the set of one or more information bits comprise at least one of: at least a part of a cell identifier, at least a portion of timing information for a cell, at least a part of a system frame number, or a combination thereof.

30. The apparatus of claim 23 , wherein the instructions are further executable by the processor to cause the apparatus to:

perform a random access procedure with the base station based at least in part on the DRS.