UE selection of contention-free and contention-based random access for handover
First Claim
Patent Images
1. A method of wireless communication, comprising:
- receiving, at a user equipment (UE), a random access configuration, wherein the random access configuration includes configuration for contention-free random access (CFRA) and contention-based random access (CBRA);
determining, at the UE, a first random access resource, wherein the first random access resource maps to one or more beams from a target base station;
initiating, by the UE, a random access request using the CFRA when the first random access resource is a contention-free resource;
determining, by the UE, a beam quality associated with the first random access resource; and
initiating, by the UE, the random access request using the CBRA when the first random access resource is the contention-free resource, and the beam quality of the first random access resource is below a threshold beam quality.
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Abstract
User equipment (UE) selection of contention-free random access (CFRA) and contention-based random access (CBRA) for handover processing is discussed. The aspects include receiving a random access configuration at the UE including configuration for CFRA and CBRA. The UE will determine a first random access resource, wherein the first random access resource maps to one or more beams from a target base station. The UE may initiate a random access request using the CFRA when the first random access resource is a contention-free resource, and initiate the random access request using the CBRA when the first random access resource is a contention-based resource.
54 Citations
24 Claims
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1. A method of wireless communication, comprising:
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receiving, at a user equipment (UE), a random access configuration, wherein the random access configuration includes configuration for contention-free random access (CFRA) and contention-based random access (CBRA); determining, at the UE, a first random access resource, wherein the first random access resource maps to one or more beams from a target base station; initiating, by the UE, a random access request using the CFRA when the first random access resource is a contention-free resource; determining, by the UE, a beam quality associated with the first random access resource; and initiating, by the UE, the random access request using the CBRA when the first random access resource is the contention-free resource, and the beam quality of the first random access resource is below a threshold beam quality. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus configured for wireless communication, comprising:
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means for receiving, at a user equipment (UE), a random access configuration, wherein the random access configuration includes configuration for contention-free random access (CFRA) and contention-based random access (CBRA); means for determining, at the UE, a first random access resource, wherein the first random access resource maps to one or more beams from a target base station; means for initiating, by the UE, a random access request using the CFRA when the first random access resource is a contention-free resource; means for determining, by the UE, a beam quality associated with the first random access resource; and means for initiating, by the UE, the random access request using the CBRA when the first random access resource is the contention-free resource, and the beam quality of the first random access resource is below a threshold beam quality. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A non-transitory computer-readable medium having program code recorded thereon, the program code comprising:
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program code executable by a computer for causing the computer to receive, at a user equipment (UE), a random access configuration, wherein the random access configuration includes configuration for contention-free random access (CFRA) and contention-based random access (CBRA); program code executable by the computer for causing the computer to determine, at the UE, a first random access resource, wherein the first random access resource maps to one or more beams from a target base station; program code executable by the computer for causing the computer to initiate, by the UE, a random access request using the CFRA when the first random access resource is a contention-free resource; program code executable by the computer for causing the computer to determine, by the UE, a beam quality associated with the first random access resource; and program code executable by the computer for causing the computer to initiate, by the UE, the random access request using the CBRA when the first random access resource is the contention-free resource, and the beam quality of the first random access resource is below a threshold beam quality. - View Dependent Claims (14, 15, 16, 17, 18)
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19. An apparatus configured for wireless communication, the apparatus comprising:
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at least one processor; and a memory coupled to the at least one processor, wherein the at least one processor is configured; to receive, at a user equipment (UE), a random access configuration, wherein the random access configuration includes configuration for contention-free random access (CFRA) and contention-based random access (CBRA); to determine, at the UE, a first random access resource, wherein the first random access resource maps to one or more beams from a target base station; to initiate, by the UE, a random access request using the CFRA when the first random access resource is a contention-free resource; to determine, by the UE, a beam quality associated with the first random access resource; and to initiate, by the UE, the random access request using the CBRA when the first random access resource is the contention-free resource, and the beam quality of the first random access resource is below a threshold beam quality. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification