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US 11,770,855 B2Granted
Random access channel (RACH) procedure design
AssigneeQUALCOMM Incorporated
InventorsHung Ly, Hao Xu, Tingfang Ji
Life of this patent
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Abstract
Certain aspects of the present disclosure are generally directed to design of random access channel (RACH) procedures. For example, certain aspects of the present disclosure provide a method for wireless communication by a user equipment (UE). The method generally includes receiving an indication of a RACH procedure capability of a network entity, and selecting a first RACH procedure or a second RACH procedure, based on the indication. The UE may then communicate one or more messages with the network entity based on the selected first RACH procedure or the selected second RACH procedure.
Claims21
A method for wireless communication by a user equipment (UE), comprising:
- receiving an indication of a random-access channel (RACH) procedure capability of a network entity;
- selecting a first RACH procedure or a second RACH procedure, based on the indication, wherein the first RACH procedure and the second RACH procedure comprise contention-based RACH procedures;
- selecting a sequence for a RACH preamble to indicate, to the network entity, whether the first RACH procedure or the second RACH procedure is selected;
- generating the RACH preamble based on the selection of the sequence;
- and
- communicating one or more messages with the network entity based on the selected first RACH procedure or the selected second RACH procedure, wherein communicating the one or more messages comprises transmitting the RACH preamble.
3 more elements
A method for wireless communication by a user equipment (UE), comprising:
- receiving an indication of a random-access channel (RACH) procedure capability of a network entity;
- selecting a first RACH procedure or a second RACH procedure, based on the indication;
- selecting a sequence for a RACH preamble to indicate, to the network entity, whether the first RACH procedure or the second RACH procedure is selected;
- generating the RACH preamble based on the selection of the sequence;
- and
- communicating one or more messages with the network entity based on the selected first RACH procedure or the selected second RACH procedure, wherein communicating the one or more messages comprises transmitting the RACH preamble, wherein:
- the indication of the RACH procedure indicates that the network entity supports both the first RACH procedure and the second RACH procedure;
- the communication comprises transmitting the RACH preamble and a RACH message to the network entity over a first subband if the first RACH procedure is selected;
- and
- the communication comprises transmitting the RACH preamble to the network entity over a second subband if the second RACH procedure is selected.
7 more elements
A method for wireless communication, comprising:
- determining a random-access channel (RACH) procedure capability of a network entity;
- transmitting, to a user equipment (UE), an indication of the RACH procedure capability of the network entity;
- communicating one or more messages in accordance with the RACH procedure capability, wherein communicating the one or more messages comprises receiving a first message including a RACH preamble after transmitting the indication of the RACH procedure capability;
- determining whether a first RACH procedure or a second RACH procedure corresponds to the first message based on a sequence of the RACH preamble, wherein the first RACH procedure and the second RACH procedure comprise contention-based RACH procedures;
- and
- decoding the first message based on the determination.
3 more elements
A method for wireless communication, comprising:
- determining a random-access channel (RACH) procedure capability of a network entity;
- transmitting, to a user equipment (UE), an indication of the RACH procedure capability of the network entity;
- communicating one or more messages in accordance with the RACH procedure capability, wherein communicating the one or more messages comprises receiving a first message including a RACH preamble after transmitting the indication of the RACH procedure capability;
- monitoring a first subband and a second subband, for the RACH preamble;
- determining whether a first RACH procedure or a second RACH procedure corresponds to the first message based on a sequence of the RACH preamble, wherein the determination of whether the first message comprises the RACH message is based on whether the RACH preamble is received on the first subband or the second subband;
- and
- decoding the first message based on the determination, wherein:
- determining the RACH procedure corresponding to the first message comprises determining whether the first message comprises a RACH message based on the RACH preamble;
- and
- decoding the first message comprises decoding the RACH message if the first message comprises the RACH message based on the determination.
7 more elements
An apparatus for wireless communication by a user equipment (UE), comprising:
- a transceiver configured to receive an indication of a random-access channel (RACH) procedure capability of a network entity;
- a processing system configured to:
- select a first RACH procedure or a second RACH procedure, based on the indication, wherein the first RACH procedure and the second RACH procedure comprise contention-based RACH procedures;
- select a sequence of a RACH preamble to indicate whether the first RACH procedure or the second RACH procedure is selected;
- and
- generate the RACH preamble based on the selection of the sequence, wherein:
- the transceiver is further configured to communicate one or more messages with the network entity based on the selected first RACH procedure or the selected second RACH procedure, wherein to communicate the one or more messages, the transceiver is further configured to transmit the RACH preamble.
4 more elements
An apparatus for wireless communication, comprising:
- a processing system configured to determine a random-access channel (RACH) procedure capability of a network entity;
- and
- a transceiver configured to:
- transmit, to a user equipment (UE), an indication of the RACH procedure capability of the network entity;
- and
- communicate one or more messages in accordance with the RACH procedure capability, wherein communicating the one or more messages comprises receiving a first message including a RACH preamble after transmitting the indication of the RACH procedure capability;
- wherein the processing system is further configured to:
- determine whether a first RACH procedure or a second RACH procedure corresponds to the first message based on a sequence of the RACH preamble, wherein the first RACH procedure and the second RACH procedure comprise contention-based RACH procedures;
- and
- decode the first message based on the determination.
7 more elements
Dependencies are inferred from the claim text.