PRACH resource selection
AssigneeApple Inc.
InventorsYujian Zhang, Seunghee Han, Gregory Morozov, Ansab Ali, Dae Won Lee, Yongjun Kwak
Life of this patent
Estimating the term…
Abstract
Systems and methods of selecting a PRACH resource opportunity are described. One of multiple Synchronization Signal Blocks (SSBs) is received. Each SSB has PSSs, SSSs and a PBCH that contain system information. A RACH occasion (RO) is selected from among multiple ROs associated with the SSB. A PRACH is transmitted on resources of the RO. The ROs are configured in a TDM and/or FDM manner. The RO is selected randomly or, if TDM is used, an earliest of the ROs from a UE-initiated RACH transmission in a previous period. A preamble of the RO is selected randomly with equal probability.
Claims20
An apparatus comprising:
- at least one processor configured to cause a user equipment (UE) to:
- receive, from a next generation NodeB (gNB), one or more Synchronization Signal Blocks (SSBs) of a plurality of SSBs;
- select a first SSB of the one or more SSBs, the first SSB having a plurality of associated random access channel (RACH) occasions (ROs);
- select a RO from among the plurality of associated ROs, wherein said selecting the RO from among the plurality of associated ROs is performed randomly such that each of the plurality of associated ROs has an equal probability of being selected;
- and
- transmit, to the gNB, a physical random access channel (PRACH) using the selected RO.
A method for operating a user equipment (UE), comprising:
- by the UE:
- receiving, from a next generation NodeB (gNB), one or more Synchronization Signal Blocks (SSBs) of a plurlaity of SSBs;
- selecting a first SSB of the one or more SSBs, the first SSB having a plurality of associated random access channel (RACH) occasions (ROs);
- selecting a RO from among the plurality of associated ROs, wherein said selecting the RO from among the plurality of associated ROs is performed randomly such that each of the plurality of associated ROs has an equal probability of being selected;
- and
- transmitting, to the gNB, a physical random access channel (PRACH) using the selected RO.
An apparatus comprising:
- at least one processor configured to cause a next generation NodeB (gNB) to:
- transmit a plurality of Synchronization Signal Blocks (SSBs), a first SSB having a plurality of random access channel (RACH) occasion (RO) associated therewith;
- receive, from a user equipment (UE), a physical random access channel (PRACH) on resources one of the plurality of ROs associated with the first SSB of the plurality of SSBs, wherein system information transmitted by the gNB includes a configuration of the plurality of ROs associated with the first SSB enabling selection of an RO of the plurality of ROs with equal probability;
- and
- in response to reception of the PRACH, transmit, to the UE, a random access response (RAR).
Dependencies are inferred from the claim text.