Technique for random access on an unlicensed channel
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsJinhua Liu, Min Wang
Life of this patent
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Abstract
A technique for performing or providing random access, RA, to a radio access network using an unlicensed channel (400) is described. As to a method aspect of the technique, a first listen-before-talk (LBT) operation on the unlicensed channel is performed. The first LBT operation indicates that the channel is occupied at a beginning (412) of a RA resource (410) for transmitting a RA message signal (304). A second LBT operation on the unlicensed channel (400) indicates that the channel (400) is idle within a part (414) of the RA resource (410) for transmitting the RA message signal (304). The RA message signal (304) is transmitted in response to the second LBT operation.
Claims23
A method of performing or providing random access (RA) to a radio access network (RAN) using an unlicensed channel, the method comprising:
- initiating or performing a first listen-before-talk (LBT) operation on the unlicensed channel, the first LBT operation indicating the channel being occupied at a beginning of a RA occasion for transmitting a RA preamble signal;
- initiating or performing a second LBT operation on the unlicensed channel, the second LBT operation indicating the channel being idle within a part of the RA occasion for transmitting the RA preamble signal;
- and
- transmitting, or initiating the transmission of, the RA preamble signal in response to the second LBT operation, wherein the transmitted RA preamble signal comprises a partial RA preamble transmitted in the idle part of the RA occasion, wherein the RA preamble signal comprises orthogonal frequency division multiplexing (OFDM) symbols, and wherein the partial RA preamble comprises a subset of the OFDM symbols configured in the RAN for a complete RA preamble.
A device for performing or providing random access (RA) to a radio access network (RAN) using an unlicensed channel, the device comprising:
- memory;
- and
- processing circuitry coupled to the memory, wherein the device is configured to:
- perform a first listen-before-talk (LBT) operation on the unlicensed channel, the first LBT operation indicating the channel being occupied at a beginning of a RA occasion for transmitting a RA preamble signal;
- perform a second LBT operation on the unlicensed channel, the second LBT operation indicating the channel being idle within a part of the RA occasion for transmitting the RA preamble signal;
- and
- transmit the RA preamble signal in response to the second LBT operation, wherein the transmitted RA preamble signal comprises a partial RA preamble transmitted in the idle part of the RA occasion, wherein the RA preamble signal comprises orthogonal frequency division multiplexing (OFDM) symbols, and wherein the partial RA preamble comprises a subset of the OFDM symbols configured in the RAN for a complete RA preamble.
Dependencies are inferred from the claim text.