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US 11,057,939 B2Granted
Apparatus, system, and method for preambles for unlicensed access
AssigneeApple Inc.
InventorsWei Zeng, Wei Zhang, Tianyan Pu, Haitong Sun, Yuchul Kim, Dawei Zhang
Life of this patent
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Abstract
Apparatuses, systems, and methods for transmitting a preamble. The UE may transmit a preamble to a base station in a random access channel (RACH). The RACH may be located in unlicensed spectrum. The bandwidth of the preamble may cover a majority of a nominal channel bandwidth of the RACH. The UE may receive a random access response and establish a connection with the base station in response to receiving the random access response.
Claims20
An apparatus, comprising:
- one or more processors, wherein the one or more processors are configured to cause a wireless device to:
- transmit a preamble to a base station in a random access channel (RACH) a plurality of times in the time domain, wherein the RACH is comprised in unlicensed spectrum, wherein bandwidth of the preamble comprises a 80 percent to 100 percent of a nominal channel bandwidth of the RACH, wherein the preamble is code division multiplexed with preambles of other wireless devices using a larger sub-carrier spacing than preambles transmitted in licensed spectrum, wherein the code division multiplexing is achieved by applying time domain orthogonal cover codes over the plurality of preamble repetitions in the time domain;
- receive a random access response;
- and
- establish a connection with the base station in response to receiving the random access response.
2 more elements
A wireless device, comprising:
- an antenna;
- a radio coupled to the antenna;
- and
- a processing element coupled to the radio;
- wherein the processing element is configured to cause the wireless device to:
- transmit a preamble to a base station in a random access channel (RACH) a plurality of times in the time domain, wherein the RACH is located in unlicensed spectrum, wherein bandwidth of the preamble comprises a 80 percent to 100 percent of a nominal channel bandwidth of the RACH, wherein the preamble is code division multiplexed with preambles of other wireless devices using a larger sub-carrier spacing than preambles transmitted in licensed spectrum, wherein the code division multiplexing is achieved by applying time domain orthogonal cover codes over the plurality of preamble repetitions in the time domain;
- receive a random access response;
- and
- establish a connection with the base station in response to receiving the random access response.
6 more elements
A method, comprising:
- by a user equipment device (UE):
- transmit a preamble to a base station in a random access channel (RACH) a plurality of times in the time domain, wherein the RACH is located in unlicensed spectrum, wherein bandwidth of the preamble comprises a 80 percent to 100 percent of a nominal channel bandwidth of the RACH, wherein the preamble is code division multiplexed with preambles of other wireless devices using a larger sub-carrier spacing than preambles transmitted in licensed spectrum, wherein the code division multiplexing is achieved by applying time domain orthogonal cover codes over the plurality of preamble repetitions in the time domain;
- receiving a random access response;
- and
- establishing a connection with the base station in response to receiving the random access response.
2 more elements
Dependencies are inferred from the claim text.