TECHNIQUES FOR SIGNALING A PUBLIC LAND MOBILE NETWORK IDENTIFIER OVER A SHARED RADIO FREQUENCY SPECTRUM BAND

• US 20180242223A1
• Filed: 08/16/2017
• Published: 08/23/2018
• Est. Priority Date: 02/21/2017
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Chendamarai Kannan, Arumugam, Radulescu, Andrei Dragos, Patel, Chirag, Kadous, Tamer
• Granted Patent: US 10,405,262 B2
• Time in Patent Office: Days
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 16/28 using beam steering
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service
• CPC Class Codes: H04W 56/001 Synchronization between nodes
• CPC Class Codes: H04W 74/008 with additional processing of random access related information at receiving side
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 84/042 Public Land Mobile systems, e.g. cellular systems
• CPC Class Codes: H04W 88/02 Terminal devices

Abstract

Techniques are described for wireless communication. A method for wireless communication at a user equipment (UE) includes receiving an instance of a discovery reference signal (DRS) on a beam over a shared radio frequency spectrum band; determining a public land mobile network identifier (PLMN ID) based at least in part on a time-frequency location of the instance of the DRS; and selectively performing a random access procedure based at least in part on the determined PLMN ID. A method for wireless communication at a base station includes transmitting an instance of a DRS on a beam over a shared radio frequency spectrum band; and transmitting a PLMN ID based at least in part on a time-frequency location of the DRS.

Claims

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

receiving an instance of a discovery reference signal (DRS) on a beam over a shared radio frequency spectrum band;

determining a public land mobile network identifier (PLMN ID) based at least in part on a time-frequency location of the instance of the DRS; and

selectively performing a random access procedure based at least in part on the determined PLMN ID.

2. The method of claim 1, further comprising:

receiving an instance of a system information block (SIB) on the beam, the instance of the SIB frequency division multiplexed with the instance of the DRS;

wherein the PLMN ID is determined based at least in part on the instance of the SIB.

3. The method of claim 2, wherein the instance of the DRS is a second instance of the DRS, the method further comprising:

receiving a first instance of the DRS on the beam;

synchronizing with a base station based at least in part on a set of one or more synchronization signals included in the first instance of the DRS; and

decoding the instance of the SIB based at least in part on the synchronizing with the base station.

4. The method of claim 3, further comprising:

determining the PLMN ID based at least in part on the time-frequency location of the instance of the DRS matches a second PLMN ID associated with the UE;

decoding random access configuration information included in at least one of the first instance of the DRS or the second instance of the DRS; and

performing the random access procedure based at least in part on the determined PLMN ID match and the decoded random access configuration information, to connect to the base station.

5. The method of claim 3, further comprising:

determining the PLMN ID based at least in part on the time-frequency location of the instance of the DRS does not match a second PLMN ID associated with the UE; and

refraining from performing the random access procedure based at least in part on the determined non-match.

6. The method of claim 2, wherein the instance of the DRS and the instance of the SIB are received according to a DRS-to-SIB transmit power ratio.

7. The method of claim 6, wherein the DRS-to-SIB transmit power ratio comprises one of a plurality of predetermined DRS-to-SIB transmit power ratios.

8. The method of claim 2, wherein the instance of the DRS comprises an indication of a transmit power of the instance of the DRS relative to a reference power.

9. The method of claim 8, wherein the instance of the DRS is a first instance of the DRS, the method further comprising:

receiving a second instance of the DRS;

measuring the first instance of the DRS and the second instance of the DRS; and

combining measurements of the first instance of the DRS and the second instance of the DRS based at least in part on the indication of the power of the first instance of the DRS.

10. The method of claim 2, wherein the instance of the DRS comprises at least one of:

a first demodulation reference signal included in the instance of the DRS due to the presence of the instance of the SIB that is frequency division multiplexed with the instance of the DRS, a second demodulation reference signal included in each instance of the DRS, or a combination thereof.

11. The method of claim 1, wherein determining the PLMN ID comprises:

receiving the PLMN ID hashed with a physical broadcast channel (PBCH) received in the instance of the DRS.

12. The method of claim 11, further comprising:

determining the PLMN ID based at least in part on the time-frequency location of the instance of the DRS matches a second PLMN ID associated with the UE;

decoding random access configuration information included in at least one of the first instance of the DRS or another instance of the DRS; and

performing the random access procedure based at least in part on the determined match and the decoded random access configuration information, to connect to a base station.

13. The method of claim 11, further comprising:

determining the PLMN ID based at least in part on the time-frequency location of the instance of the DRS does not match a second PLMN ID associated with the UE; and

refraining from performing the random access procedure based at least in part on the determined non-match.

14. The method of claim 1, wherein the instance of the DRS comprises an indication of a resource location of a SIB transmitted on the beam, the method further comprising:

receiving the instance of the SIB on the beam at the indicated resource location;

wherein the PLMN ID is determined based at least in part on the instance of the SIB.

15. The method of claim 14, wherein the resource location comprises a time window in which a transmission of the instance of the SIB commences.

16. The method of claim 14, wherein the instance of the DRS is part of a multi-beam DRS transmission, and the instance of the SIB is received as a single beam transmission.

17. The method of claim 14, wherein the indication of the resource location of the instance of the SIB is included in at least one of:

a physical broadcast channel (PBCH) received in the instance of the DRS, Layer 1 signaling associated with the instance of the DRS, or a combination thereof.

18. The method of claim 14, further comprising:

determining the PLMN ID based at least in part on the time-frequency location of the instance of the DRS matches a second PLMN ID associated with the UE;

decoding random access configuration information included in at least one of the first instance of the DRS or another instance of the DRS; and

performing the random access procedure based at least in part on the determined match and the decoded random access configuration information, to connect to a base station.

19. The method of claim 14, further comprising:

determining the PLMN ID based at least in part on the time-frequency location of the instance of the DRS does not match a second PLMN ID associated with the UE; and

refraining from performing the random access procedure based at least in part on the determined non-match.

20. An apparatus for wireless communication at a user equipment (UE), comprising:

a processor;

memory in electronic communication with the processor; and

instructions stored in the memory, wherein the instructions are executable by the processor to;

receive an instance of a discovery reference signal (DRS) on a beam over a shared radio frequency spectrum band;

determine a public land mobile network identifier (PLMN ID) based at least in part on a time-frequency location of the instance of the DRS; and

selectively perform a random access procedure based at least in part on the determined PLMN ID.

21. The apparatus of claim 20, wherein the instructions are executable by the processor to:

receive an instance of a system information block (SIB) on the beam, the instance of the SIB frequency division multiplexed with the instance of the DRS;

wherein the PLMN ID is determined based at least in part on the instance of the SIB.

22. The apparatus of claim 21, wherein the instance of the DRS is a second instance of the DRS, and the instructions are executable by the processor to:

receive a first instance of the DRS on the beam;

synchronize with a base station based at least in part on a set of one or more synchronization signals included in the first instance of the DRS; and

decode the instance of the SIB based at least in part on the synchronizing with the base station.

23. The apparatus of claim 21, wherein the instance of the DRS and the instance of the SIB are received according to a DRS-to-SIB transmit power ratio.

24. The apparatus of claim 21, wherein the instance of the DRS comprises an indication of a transmit power of the instance of the DRS relative to a reference power.

25. The apparatus of claim 21, wherein the instance of the DRS comprises at least one of:

a first demodulation reference signal included in the instance of the DRS due to the presence of the instance of the SIB that is frequency division multiplexed with the instance of the DRS, a second demodulation reference signal included in each instance of the DRS, or a combination thereof.

26. The apparatus of claim 20, wherein the instructions executable by the processor to determine the PLMN ID comprise instructions executable by the processor to:

receive the PLMN ID hashed with a physical broadcast channel (PBCH) received in the instance of the DRS.

27. The apparatus of claim 20, wherein the instance of the DRS comprises an indication of a resource location of a SIB transmitted on the beam, and the instructions are executable by the processor to:

receive the instance of the SIB on the beam at the indicated resource location;

wherein the PLMN ID is determined based at least in part on the instance of the SIB.

28. The apparatus of claim 27, wherein the resource location comprises a time window in which a transmission of the instance of the SIB commences.

29. The apparatus of claim 27, wherein the instance of the DRS is part of a multi-beam DRS transmission, and the instance of the SIB is received as a single beam transmission.

30. A non-transitory computer-readable medium storing code for wireless communication at a user equipment (UE), the code comprising instructions executable to:

receive an instance of a discovery reference signal (DRS) on a beam over a shared radio frequency spectrum band;

determine a public land mobile network identifier (PLMN ID) based at least in part on a time-frequency location of the instance of the DRS; and

selectively perform a random access procedure based at least in part on the determined PLMN ID.