Signaling support and resource mapping for 2-step RACH

Patent metadata

Field	Value
Publication number	US-11895708-B2
Application number	US-201817414135-A
Country	US
Kind code	B2
Filing date	Dec 18, 2018
Priority date	Dec 18, 2018
Publication date	Feb 6, 2024
Grant date	Feb 6, 2024

Abstract

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive an indication of a resource configuration for a random access (RA) procedure. The resource configuration may identify multiple sets of transmission resources corresponding to multiple radio resource control (RRC) states. The UE may identify an RRC state and may determine a set of transmission resources and/or a transport format based on the indication of the resource configuration, the identified RRC state, and/or a UE identifier (UE ID). The UE may transmit a first RA procedure message (e.g., a msgA) using the determined transmission resources and/or transport format. The base station may receive the message and may identify the RRC state of the UE based on the first message and transmitted indication of the resource configuration. The base station may transmit a second RA procedure message (e.g., a msgB), which the UE may receive.

First claim

What is claimed is:

1. A method for wireless communication at a user equipment (UE), comprising:
receiving, from a base station, an indication of a resource configuration for a random access procedure, the resource configuration identifying a plurality of sets of transmission resources corresponding to a plurality of radio resource control states;
identifying a radio resource control state of the UE;
determining a set of transmission resources based at least in part on the indication of the resource configuration, a transport format, and the identified radio resource control state; and
transmitting a first message of the random access procedure to the base station using the determined transmission resources and the transport format.

2. The method of claim 1 , further comprising:
identifying at least one transmission parameter to be used by the UE to transmit the first message, wherein the set of transmission resources is determined based at least in part on the indication of the resource configuration, the transport format, the identified radio resource control state, and the at least one transmission parameter.

3. The method of claim 1 , further comprising:
determining a UE identifier of the UE based at least in part on the identified radio resource control state of the UE; and
monitoring, based at least in part on the determined UE identifier, for a second message of the random access procedure transmitted by the base station in response to the transmitted first message.

4. The method of claim 1 , wherein the plurality of sets of transmission resources comprise at least a first set of transmission resources and a second set of transmissions resources, the first set of transmission resources comprise a first uplink data portion corresponding to a first subset of a preamble portion, and the second set of transmission resources comprise a second uplink data portion corresponding to a second subset of the preamble portion.

5. The method of claim 1 , wherein identifying the radio resource control state of the UE comprises:
identifying that the UE is operating in one of a radio resource control inactive state, or a radio resource control connected state, or a radio resource control idle state.

6. The method of claim 1 , wherein receiving the indication of the resource configuration for the random access procedure comprises:
receiving system information, or radio resource control signaling, or a paging signal, or a combination thereof, comprising the indication of the resource configuration.

7. The method of claim 1 , wherein the plurality of sets of transmission resources comprise time resources, or frequency resources, or spatial resources, or a combination thereof.

8. The method of claim 1 , wherein the random access procedure is a two-step random access procedure that comprises the first message and a second message, the method further comprising:
receiving, in response to the transmitted first message, the second message of the two-step random access procedure.

9. The method of claim 1 , further comprising:
identifying that the UE lacks a valid timing advance value for the random access procedure, wherein the first message is transmitted regardless of the UE lacking the valid timing advance value.

10. A method comprising for wireless communication at a base station, comprising:
transmitting, to a user equipment (UE), an indication of a resource configuration for a random access procedure, the resource configuration identifying a plurality of sets of transmission resources corresponding to a plurality of radio resource control states;
receiving, from the UE, a first message of the random access procedure;
identifying a radio resource control state of the UE based at least in part on the received first message of the random access procedure and the transmitted indication of the resource configuration; and
transmitting, to the UE based at least in part on the identified radio resource control state of the UE, a second message of the random access procedure in response to the received first message.

11. 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 and executable by the processor to cause the apparatus to:
receive, from a base station, an indication of a resource configuration for a random access procedure, the resource configuration identifying a plurality of sets of transmission resources corresponding to a plurality of radio resource control states;
identify a radio resource control state of the UE;
determine a set of transmission resources based at least in part on the indication of the resource configuration, a transport format, and the identified radio resource control state; and
transmit a first message of the random access procedure to the base station using the determined transmission resources and the transport format.

12. The apparatus of claim 11 , wherein the instructions are further executable by the processor to cause the apparatus to:
identify at least one transmission parameter to be used by the UE to transmit the first message, wherein the set of transmission resources is determined based at least in part on the indication of the resource configuration, the transport format, the identified radio resource control state, and the at least one transmission parameter.

13. The apparatus of claim 11 , wherein the instructions are further executable by the processor to cause the apparatus to:
determine a UE identifier of the UE based at least in part on the identified radio resource control state of the UE, wherein the set of transmission resources is determined based at least in part on the indication of the resource configuration, the transport format, the identified radio resource control state, and the identifier of the UE.

14. The apparatus of claim 11 , wherein the instructions are further executable by the processor to cause the apparatus to:
determine a UE identifier of the UE based at least in part on the identified radio resource control state of the UE; and
monitor, based at least in part on the determined UE identifier, for a second message of the random access procedure transmitted by the base station in response to the transmitted first message.

15. The apparatus of claim 14 , wherein the instructions are further executable by the processor to cause the apparatus to:
determine a search space for a control region of the second message based at least in part on the identified radio resource control state of the UE, wherein the monitoring is further based on the determined search space.

16. The apparatus of claim 14 , wherein the instructions are further executable by the processor to cause the apparatus to:
determine a time duration for at least a portion of the second message based at least in part on the identified radio resource control state of the UE, wherein the monitoring is further based on the determined time duration.

17. The apparatus of claim 11 , wherein the plurality of sets of transmission resources comprise at least a first set of transmission resources and a second set of transmissions resources, the first set of transmission resources comprise a first uplink data portion corresponding to a first subset of a preamble portion, and the second set of transmission resources comprise a second uplink data portion corresponding to a second subset of the preamble portion.

18. The apparatus of claim 17 , wherein the first uplink data portion of the first s

Assignees

• Qualcomm Inc
• Lei Jing
• Park Seyong
• Soriaga Joseph Binamira
• Huang Yi
• Cao Yiqing
• Ji Tingfang
• Montojo Juan
• Gaal Peter
• Chen Wanshi

Inventors

• Lei Jing
• Park Seyong
• Soriaga Joseph Binamira
• Huang Yi
• Cao Yiqing
• Ji Tingfang
• Montojo Juan
• Gaal Peter
• Chen Wanshi

Classifications

• H04W74/006 Primary

  in the downlink, i.e. towards the terminal · CPC title

• H04W74/0836 Primary

  with 2-step access · CPC title

• H04W74/0833 Primary

  Random access procedures, e.g. with 4-step access · CPC title

• H04W48/08

  Access restriction or access information delivery, e.g. discovery data delivery (signalling during connection H04W76/00) · CPC title

• H04W72/046

  the resource being in the space domain, e.g. beams · CPC title