IP Library › Granted Patent US 11,737,148
Granted Patent B2
US 11,737,148 · App. 17/573,413 · Granted Aug 22, 2023

Downlink radio resource control message transmission in 2-step random access

Inventors: Fangli Xu (Beijing, CN); Haijing Hu (Beijing, CN); Yuqin Chen (Beijing, CN); Dawei Zhang (Saratoga, CA); Wei Zeng (San Diego, CA); Haitong Sun (Irvine, CA)
Assignee: Apple Inc.
H04W74/0833H04L5/0055H04W76/11H04W76/27H04W80/02
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Quick Facts
Patent No.
US 11,737,148
App. No.
17/573,413
Granted
Aug 22, 2023
Kind
B2
Abstract

Apparatuses, systems, and methods for a wireless device to perform 2-step random access procedures. The disclosure identifies techniques for transmitting and receiving downlink connection configuration information, such as a radio resource control message, in a 2-step random access procedure.

Claims (35)

1. An apparatus, comprising:

a processor configured to cause a base station to:

transmit random access configuration information for 2-step random access;

receive, from at least a first user equipment device (UE), at least one first message (MsgA) of the 2-step random access according to the random access configuration information; and

transmit a MsgB in response to the at least one first message (MsgA), the MsgB including a first sub protocol data unit (subPDU) of the MsgB including a success random access response (successRAR) for the first UE and immediately followed by a second subPDU including a radio resource control (RRC) message for the first UE, wherein the first subPDU includes a first subheader in addition to the successRAR, wherein the second subPDU includes a second subheader without a random access preamble identifier (RAPID) in addition to the RRC message for the UE.

2. The apparatus of claim 1 , wherein the first subheader indicates whether the first subPDU includes backoff indication.

3. The apparatus of claim 1 , wherein the RRC message is scheduled by a random access radio network temporary identifier (RA-RNTI).

4. The apparatus of claim 1 , wherein the first subPDU does not include an RRC message.

5. The apparatus of claim 1 , wherein the RRC message comprises an RRC setup message.

6. The apparatus of claim 1 , wherein the RRC message follows all random access response (RAR) messages in the MsgB.

7. The apparatus of claim 1 , wherein the processor is further configured to cause the base station to:

determine that a second UE did not receive a corresponding random access response (RAR) message; and

perform a retransmission of the corresponding RAR message.

8. An apparatus, comprising:

a processor configured to cause a user equipment device (UE) to:

receive, from a base station, random access configuration information for 2-step random access;

transmit, to the base station, a first message (MsgA) of the 2-step random access according to the random access configuration information; and

receive, from the base station, a MsgB in response to the first message (MsgA), the MsgB including a first sub protocol data unit (subPDU) of the MsgB including a success random access response (successRAR) for the UE and immediately followed by a second subPDU including a radio resource control (RRC) message for the UE, wherein the first subPDU includes a first subheader in addition to the successRAR, wherein the second subPDU includes a second subheader without a random access preamble identifier (RAPID) in addition to the RRC message for the UE.

9. The apparatus of claim 8 , wherein the first subheader indicates whether the first subPDU includes backoff indication.

10. The apparatus of claim 8 , wherein the RRC message is scheduled by a random access radio network temporary identifier (RA-RNTI).

11. The apparatus of claim 8 , wherein the first subPDU does not include an RRC message.

12. The apparatus of claim 8 , wherein the RRC message comprises an RRC setup message.

13. The apparatus of claim 8 , wherein the RRC message follows all random access response (RAR) messages in the MsgB.

14. The apparatus of claim 8 , wherein the second subheader indicates whether the second subPDU includes backoff indication.

15. A user equipment device (UE), comprising:

a radio; and

a processor operably coupled to the radio and configured to cause the UE to:

receive, from a base station, random access configuration information for 2-step random access;

transmit, to the base station, a first message (MsgA) of the 2-step random access according to the random access configuration information; and

receive, from the base station, a MsgB in response to the first message (MsgA), the MsgB including a first sub protocol data unit (subPDU) of the MsgB including a success random access response (successRAR) for the UE and immediately followed by a second subPDU including a radio resource control (RRC) message for the UE, wherein the first subPDU includes a first subheader in addition to the successRAR, wherein the second subPDU includes a second subheader without a random access preamble identifier (RAPID) in addition to the RRC message for the UE.

16. The UE of claim 15 , wherein the first subheader indicates whether the first subPDU includes backoff indication.

17. The UE of claim 15 , wherein the RRC message is scheduled by a random access radio network temporary identifier (RA-RNTI).

18. The UE of claim 15 , wherein the first subPDU does not include an RRC message.

19. The UE of claim 15 , wherein the RRC message comprises an RRC setup message.

20. The UE of claim 15 , wherein the RRC message follows all random access response (RAR) messages in the MsgB.

Priority Claims (1)
CN 201910745594.1 · Aug 13, 2019 · national
Continuity (2)
Continuation 16885937 · May 28, 2020
Related Publication 20220141882A1 · May 5, 2022
Cited By (1)
US 12,309,847