IP Library › Patent Application 18894842
Patent Application
App. No. 18/894,842

Random Access Procedures Using Multiple Active Bandwidth Parts

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Quick Facts
Patent No.
US None
App. No.
18/894,842
Abstract

Wireless communications using multiple active resources (e.g., bandwidth parts (BWP)) are described. A predetermined rule may be used to determine on which downlink (DL) BWP of multiple active DL BWPs, and/or on which uplink (UL) BWP of multiple active UL BWPs, a message is to be sent. A wireless device and/or a base station may reduce the quantity of active DL BWPs and/or active UL BWPs to monitor for a response.

Claims (60)

1 . A method comprising:

receiving, by a wireless device, one or more configuration parameters for a plurality of bandwidth parts (BWPs) of a first cell;

activating:

a first BWP associated with a first random-access response (RAR) monitoring window; and

a second BWP, of the first cell, associated with a second RAR monitoring window;

starting, based on sending via a second cell at least one preamble for a random access procedure, the first RAR monitoring window and the second RAR monitoring window for monitoring a random access response to the at least one preamble;

and

sending, based on determining that the first RAR monitoring window and the second RAR monitoring window have expired, at least one second preamble.

2 . The method of claim 1 , further comprising:

switching, based on the determining, from the first BWP to a third BWP of the first cell.

3 . The method of claim 1 , wherein the one or more configuration parameters indicate a BWP-specific index for the first BWP and the second BWP.

4 . The method of claim 1 , further comprising:

based on a determination that the first BWP and the second BWP are not configured with random access channel resources, determining one of the first BWP and the second BWP; and

switching, from the one of the first BWP and the second BWP, to a different BWP of the first cell.

5 . The method of claim 4 , wherein the determining the one of the first BWP and the second BWP is based on a first BWP-specific index associated with the one of the first BWP and the second BWP.

6 . The method of claim 1 , further comprising:

based on a determination that the first BWP and the second BWP are not configured with random access channel resources, determining one of the first BWP and the second BWP based on a highest or a lowest BWP-specific index relative to BWP-specific indexes of the first BWP and the second BWP.

7 . The method of claim 1 , wherein the activating the first BWP and the second BWP further comprises:

activating the first BWP in a first slot; and

activating the second BWP in a second slot.

8 . A wireless device comprising:

one or more processors; and

memory storing instructions that, when executed by the one or more processors, cause the wireless device to:

receive one or more configuration parameters for a plurality of bandwidth parts (BWPs) of a first cell;

activate:

a first BWP associated with a first random-access response (RAR) monitoring window; and

a second BWP, of the first cell, associated with a second RAR monitoring window;

start, based on sending via a second cell at least one preamble for a random access procedure, the first RAR monitoring window and the second RAR monitoring window for monitoring a random access response to the at least one preamble; and

send, based on determining that the first RAR monitoring window and the second RAR monitoring window have expired, at least one second preamble.

9 . The wireless device of claim 8 , wherein the instructions, when executed by the one or more processors, cause the wireless device to:

switch, based on the determining, from the first BWP to a third BWP of the first cell.

10 . The wireless device of claim 8 , wherein the one or more configuration parameters indicate a BWP-specific index for the first BWP and the second BWP.

11 . The wireless device of claim 8 , wherein the instructions, when executed by the one or more processors, cause the wireless device to:

based on a determination that the first BWP and the second BWP are not configured with random access channel resources, determine one of the first BWP and the second BWP; and

switch from the one of the first BWP and the second BWP, to a different BWP of the first cell.

12 . The wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, cause the wireless device to determine the one of the first BWP and the second BWP based on a first BWP-specific index associated with the one of the first BWP and the second BWP.

13 . The wireless device of claim 8 , wherein the instructions, when executed by the one or more processors, cause the wireless device to:

based on a determination that the first BWP and the second BWP are not configured with random access channel resources, determine one of the first BWP and the second BWP based on a highest or a lowest BWP-specific index relative to BWP-specific indexes of the first BWP and the second BWP.

14 . The wireless device of claim 8 , wherein the instructions, when executed by the one or more processors, cause the wireless device to activate the first BWP and the second BWP by causing:

activating the first BWP in a first slot; and

activating the second BWP in a second slot.

15 . One or more non-transitory computer readable media storing instructions that, when executed cause:

receiving one or more configuration parameters for a plurality of bandwidth parts (BWPs) of a first cell;

activating:

a first BWP associated with a first random-access response (RAR) monitoring window; and

a second BWP, of the first cell, associated with a second RAR monitoring window;

starting, based on sending via a second cell at least one preamble for a random access procedure, the first RAR monitoring window and the second RAR monitoring window for monitoring a random access response to the at least one preamble;

and

sending, based on determining that the first RAR monitoring window and the second RAR monitoring window have expired, at least one second preamble.

16 . The one or more non-transitory computer readable media of claim 15 , wherein the instructions, when executed, further cause:

switching, based on the determining, from the first BWP to a third BWP of the first cell.

17 . The one or more non-transitory computer readable media of claim 15 , wherein the instructions, when executed, further cause:

based on a determination that the first BWP and the second BWP are not configured with random access channel resources, determining one of the first BWP and the second BWP; and

switching, from the one of the first BWP and the second BWP, to a different BWP of the first cell.

18 . The one or more non-transitory computer readable media of claim 17 , wherein the instructions, when executed, further cause determining the one of the first BWP and the second BWP based on a first BWP-specific index associated with the one of the first BWP and the second BWP.

19 . The one or more non-transitory computer readable media of claim 15 , wherein the instructions, when executed, further cause:

based on a determination that the first BWP and the second BWP are not configured with random access channel resources, determining one of the first BWP and the second BWP based on a highest or a lowest BWP-specific index relative to BWP-specific indexes of the first BWP and the second BWP.

20 . The one or more non-transitory computer readable media of claim 15 , wherein the instructions, when executed, further cause activating the first BWP and the second BWP by causing:

activating the first BWP in a first slot; and

activating the second BWP in a second slot.