Random access channel (RACH) timing adjustment
First Claim
1. A method for wireless communication, comprising:
- transmitting a first message of a random access channel (RACH) procedure, the first message comprising a RACH preamble;
receiving a second message of the RACH procedure, the second message comprising random access response (RAR) in response to the RACH preamble;
transmitting a third message of the RACH procedure in response to the RAR, wherein the third message is transmitted to a base station (BS) and comprises at least one reference signal (RS) to be used by the BS to determine at least one timing advance (TA) parameter, wherein the at least one RS comprises a plurality of reference signals that are transmitted using a plurality of transmit beams;
receiving a fourth message of the RACH procedure in response to the third message, wherein the fourth message comprises a plurality of TA parameters each determined for one of the plurality of transmit beams, wherein the plurality of TA parameters are included in the same fourth message; and
communicating one or more messages based on at least one of the plurality of TA parameters.
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Accused Products
Abstract
Certain aspects of the present disclosure provide techniques for random access channel (RACH) communication. For example, certain aspects provide a method for wireless communication by a user-equipment (UE). The method generally includes transmitting a first message comprising a RACH preamble, receiving a second message comprising random access response (RAR) in response to the RACH preamble, transmitting a third message in response to the RAR, receiving a fourth message (MSG4) comprising a contention resolution message in response to the third message. In certain aspects, the fourth message may include a timing advance (TA) parameter which may be used to communicate one or more messages.
12 Citations
24 Claims
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1. A method for wireless communication, comprising:
- transmitting a first message of a random access channel (RACH) procedure, the first message comprising a RACH preamble;
receiving a second message of the RACH procedure, the second message comprising random access response (RAR) in response to the RACH preamble;
transmitting a third message of the RACH procedure in response to the RAR, wherein the third message is transmitted to a base station (BS) and comprises at least one reference signal (RS) to be used by the BS to determine at least one timing advance (TA) parameter, wherein the at least one RS comprises a plurality of reference signals that are transmitted using a plurality of transmit beams;
receiving a fourth message of the RACH procedure in response to the third message, wherein the fourth message comprises a plurality of TA parameters each determined for one of the plurality of transmit beams, wherein the plurality of TA parameters are included in the same fourth message; and
communicating one or more messages based on at least one of the plurality of TA parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- transmitting a first message of a random access channel (RACH) procedure, the first message comprising a RACH preamble;
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8. A method for wireless communication, comprising:
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receiving a first message of a random access channel (RACH) procedure, the first message comprising a RACH preamble; transmitting a second message of the RACH procedure, the second message comprising random access response (RAR) in response to the RACH preamble; receiving a third message of the RACH procedure in response to the RAR, wherein the third message comprises a plurality of reference signals (RSs) that are received using a plurality of receive beams; determining a plurality of timing advance (TA) parameters, each of the plurality of TA parameters determined for one of the plurality of receive beams; transmitting a fourth message of the RACH procedure in response to the third message, wherein the fourth message comprises the plurality of TA parameters, wherein the plurality of TA parameters are included in the same fourth message; and communicating one or more messages based on at least one of the plurality of TA parameters. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for wireless communication, comprising:
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transmitting a first message of a random access channel (RACH) procedure, the first message comprising a RACH preamble; receiving a second message of the RACH procedure, the second message comprising random access response (RAR) in response to the RACH preamble; transmitting a third message of the RACH procedure in response to the RAR, wherein the third message comprises a plurality of reference signals that are transmitted using a plurality of transmit beams; receiving a fourth message of the RACH procedure in response to the third message, wherein the fourth message comprises an index associated with a beam, wherein the fourth message comprises a plurality of TA parameters each determined for one of the plurality of transmit beams, wherein the plurality of TA parameters are included in the same fourth message; and communicating one or more messages based on the index. - View Dependent Claims (18, 19, 20)
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21. A method for wireless communication, comprising:
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receiving a first message of a random access channel (RACH) procedure, the first message comprising a RACH preamble; transmitting a second message of the RACH procedure, the second message comprising random access response (RAR) in response to the RACH preamble; receiving a third message of the RACH procedure in response to the RAR, wherein the third message comprises a plurality of reference signals that are received using a plurality of receive beams; transmitting a fourth message of the RACH procedure in response to the third message, wherein the fourth message comprises an index associated with a beam, wherein the fourth message comprises a plurality of TA parameters each determined for one of the plurality of receive beams, wherein the plurality of TA parameters are included in the same fourth message; and communicating one or more messages based on the index. - View Dependent Claims (22, 23, 24)
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Specification