CONVEYING RACH INFORMATION THROUGH PBCH

• US 20180054837A1
• Filed: 01/31/2017
• Published: 02/22/2018
• Est. Priority Date: 08/19/2016
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: ISLAM, Muhammad Nazmul, LUO, Tao, CEZANNE, Juergen, SUBRAMANIAN, Sundar, LI, Junyi, HAMPEL, Karl Georg, SADIQ, Bilal
• Granted Patent: US 10,531,492 B2
• Time in Patent Office: Days
• CPC Class Codes: H04W 72/30 Resource management for broadcast services
• CPC Class Codes: H04W 74/006 in the downlink, i.e. towards the terminal
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 88/02 Terminal devices

Abstract

In millimeter wave systems, user equipment may not be able to receive RACH parameters through a PDCCH when the information is transmitted with an omni-directional beam. In an aspect of the disclosure, an apparatus, such as a base station, may determine the RACH parameters and transmit a subset of the RACH parameters via a PBCH. The user equipment may receive the RACH parameter subset and initiate a RACH procedure.

Claims

1. A method of wireless communication by a user equipment (UE), comprising:

receiving a message that includes RACH information associated with a base station via a physical broadcast channel (PBCH); and

transmitting a RACH message to the base station during a RACH procedure based on the received RACH information.

2. The method of claim 1, wherein the RACH information is a subset of RACH parameters associated with the base station, and the RACH parameters include a beam sweep periodicity, a RACH preamble index, a RACH configuration, a RACH format, a RACH frequency, a base station transmit power, and a RACH power ramping step.

3. The method of claim 2, further comprising receiving via the PBCH an indication of whether the RACH parameters are to be transmitted via an extended PBCH (ePBCH).

4. The method of claim 3, wherein the RACH information is received based on whether the RACH parameters are to be transmitted via the ePBCH.

5. The method of claim 3, wherein the RACH message is transmitted during the RACH procedure based on the RACH information if the RACH parameters will not be transmitted via the ePBCH.

6. The method of claim 2, further comprising receiving via the PBCH an indication of a periodicity with which the RACH parameters are to be transmitted via an extended PBCH (ePBCH).

7. The method of claim 6, wherein the RACH message is transmitted during the RACH procedure based on the periodicity with which the RACH parameters are to be received in the ePBCH.

8. The method of claim 2, further comprising receiving at least a subset of the RACH parameters via a system information block (SIB).

9. The method of claim 8, wherein the SIB is received via an extended PBCH (ePBCH).

10. The method of claim 8, wherein the SIB is received via a physical downlink control channel (PDCCH) or a physical downlink shared channel (PDSCH).

11. The method of claim 2, further comprising receiving at least a subset of the RACH parameters during a RACH procedure.

12. The method of claim 1, wherein the RACH message is transmitted to the base station before the UE receives a system information block (SIB) from the base station via a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), or an extended physical broadcast channel (ePBCH).

13. The method of claim 1, wherein the message that includes RACH information is beamformed.

14. A user equipment (UE) for wireless communication, comprising:

means for receiving a message that includes RACH information associated with a base station via a physical broadcast channel (PBCH); and

means for transmitting a RACH message to the base station during a RACH procedure based on the received RACH information.

15. The UE of claim 14, wherein the RACH information is a subset of RACH parameters associated with the base station, and the RACH parameters include a beam sweep periodicity, a RACH preamble index, a RACH configuration, a RACH format, a RACH frequency, a base station transmit power, and a RACH power ramping step.

16. The UE of claim 15, further comprising receiving via the PBCH an indication of whether the RACH parameters are to be transmitted via an extended PBCH (ePBCH).

17. A user equipment (UE) for wireless communication, comprising:

a memory; and

at least one processor coupled to the memory and configured to;

receive a message that includes RACH information associated with a base station via a physical broadcast channel (PBCH); and

transmit a RACH message to the base station during a RACH procedure based on the received RACH information.

18. The UE of claim 17, wherein the RACH information is a subset of RACH parameters associated with the base station, and the RACH parameters include a beam sweep periodicity, a RACH preamble index, a RACH configuration, a RACH format, a RACH frequency, a base station transmit power, and a RACH power ramping step.

19. The UE of claim 18, wherein the at least one processor is further configured to receive via the PBCH an indication of whether the RACH parameters are to be transmitted via an extended PBCH (ePBCH).

20. The UE of claim 19, wherein the RACH information is received based on whether the RACH parameters are to be transmitted via the ePBCH.

21. The UE of claim 19, wherein the RACH message is transmitted during the RACH procedure based on the RACH information if the RACH parameters will not be transmitted via the ePBCH.

22. The UE of claim 18, wherein the at least one processor is further configured to receive via the PBCH an indication of a periodicity with which the RACH parameters are to be transmitted via an extended PBCH (ePBCH).

23. The UE of claim 22, wherein the RACH message is transmitted during the RACH procedure based on the periodicity with which the RACH parameters are to be received in the ePBCH.

24. The UE of claim 18, wherein the at least one processor is further configured to receive at least a subset of the RACH parameters via a system information block (SIB).

25. The UE of claim 24, wherein the SIB is received via an extended PBCH (ePBCH).

26. The UE of claim 24, wherein the SIB is received via a physical downlink control channel (PDCCH) or a physical downlink shared channel (PDSCH).

27. The UE of claim 18, wherein the at least one processor is further configured to receive at least a subset of the RACH parameters during a RACH procedure.

28. The UE of claim 17, wherein the RACH message is transmitted to the base station before the UE receives a system information block (SIB) from the base station via a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), or an extended physical broadcast channel (ePBCH).

29. The UE of claim 17, wherein the message that includes RACH information is beamformed.

30. A computer-readable medium of a user equipment (UE) storing computer executable code, comprising code to:

receive a message that includes RACH information associated with a base station via a physical broadcast channel (PBCH); and

transmit a RACH message to the base station during a RACH procedure based on the received RACH information.