Beam refinement using channel state information reference signal in random access procedure
AssigneeQUALCOMM Incorporated
InventorsMahmoud Taherzadeh Boroujeni, Tao Luo
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Abstract
Aspects of the present disclosure provide methods, systems, devices, and apparatuses that support coverage enhancement techniques in a random access procedure. In a random access procedure, a UE may attempt to connect to a base station by transmitting a random access request to the base station. The base station may respond to the random access request by transmitting, to the UE, a random access response (RAR). In some aspects, the base station can transmit a channel-state information reference signal (CSI-RS) to facilitate beam-refinement for coverage enhancement during the random access procedure.
Claims24
A user equipment (UE) for wireless communication, comprising:
- a transceiver for wireless communication;
- a memory;
- and
- one or more processors coupled with the transceiver and the memory, wherein the one or more processors are configured to:
- transmit, to a scheduling entity, a first message that initiates a random access channel (RACH) procedure;
- receive, from the scheduling entity, a second message of the RACH procedure, the second message comprising an indication of one or more channel state information reference signal (CSI-RS) resources for receiving a plurality of CSI-RSs from the scheduling entity;
- receive, from a same beam of the scheduling entity, the plurality of CSI-RSs using the one or more CSI-RS resources;
- determine a respective quality of the plurality of CSI-RSs corresponding to a plurality of receive beams of the UE;
- select one of the plurality of receive beams for communicating with the scheduling entity based on the determined quality of the plurality of CSI-RSs;
- and
- transmit, using the selected one of the plurality of receive beams, a third message of the RACH procedure.
A method for wireless communication at a user equipment (UE), comprising:
- transmitting, to a scheduling entity, a first message that initiates a random access channel (RACH) procedure;
- receiving, from the scheduling entity, a second message of the RACH procedure, the second message comprising an indication of one or more channel state information reference signal (CSI-RS) resources for receiving a plurality of CSI-RSs from the scheduling entity;
- receiving, from a same beam of the scheduling entity, the plurality of CSI-RSs using the one or more CSI-RS resources;
- determining a respective quality of the plurality of CSI-RSs corresponding to a plurality of receive beams of the UE;
- selecting one of the plurality of receive beams for communicating with the scheduling entity based on the determined quality of the plurality of CSI-RSs;
- and
- transmitting, using the selected one of the plurality of receive beams, a third message of the RACH procedure.
A scheduling entity for wireless communication, comprising:
- a transceiver for wireless communication;
- a memory;
- and
- one or more processors coupled with the transceiver and the memory, wherein the one or more processors are configured to:
- receive, from a user equipment (UE), a first message that initiates a random access channel (RACH) procedure;
- transmit, to the UE, a second message of the RACH procedure, the second message comprising an indication of one or more channel state information reference signal (CSI-RS) resources for transmitting a plurality of CSI-RSs, and a field indicating that the plurality of CSI-RSs not being associated with a feedback report;
- transmit, in a same beam of the scheduling entity, the plurality of CSI-RSs using the one or more CSI-RS resources;
- and
- receive a third message of the RACH procedure after transmitting the plurality of CSI-RS s.
A method of wireless communication at a scheduling entity, the method comprising:
- receiving, from a user equipment (UE), a first message that initiates a random access channel (RACH) procedure;
- transmitting, to the UE, a second message of the RACH procedure, the second message comprising an indication of one or more channel state information reference signal (CSI-RS) resources for transmitting a plurality of CSI-RSs, and a field indicating that the plurality of CSI-RSs not being associated with a feedback report;
- transmitting, in a same beam of the scheduling entity, the plurality of CSI-RSs using the one or more CSI-RS resources;
- and
- receiving a third message of the RACH procedure after transmitting the plurality of CSI-RSs.
Dependencies are inferred from the claim text.