Random access in a wireless device and wireless network
First Claim
1. A method comprising:
- receiving, by a wireless device from a first base station, at least one first message comprising;
configuration parameters for a plurality of cells comprising a plurality of cell groups comprising;
a first cell group for communication with the first base station; and
a second cell group for communication with a second base station, the second cell group comprising a licensed assisted access (LAA) cell; and
one or more random access channel (RACH) configuration parameters for a RACH of the LAA cell;
performing a listen before talk (LBT) procedure to transmit a preamble via the RACH of the LAA cell of the second base station in response to initiating a random access process with the second base station;
incrementing a counter in response to the LBT procedure indicating that the channel is occupied;
determining a failure of the random access process in response to the counter reaching a first value; and
transmitting, by the wireless device to the first base station, at least one second message in response to the failure of the random access process with the second base station, wherein the at least one second message comprises;
an indication of the failure of the random access process with the second base station; and
one or more parameters indicating that at least one LBT failure occurred during the failed random access process.
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Accused Products
Abstract
A wireless device receives a message from a first base station. The message comprises first configuration parameters for cells. Cells comprise cell groups. Cell groups comprise a first cell group for communication with the first base station, and a second cell group for communication with a second base station. The second cell group comprises an LAA cell, and RACH(s) configuration parameters for a RACH of the LAA cell. The wireless device performs an LBT procedure to transmit a preamble via the RACH of the LAA cell in response to initiating a random access process. The wireless device increments a counter in response to the LBT procedure indicating that the channel is occupied and determining a failure of the random access process in response to the counter reaching a first value. The wireless device transmits second message in response to the failure of the random access process.
15 Citations
20 Claims
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1. A method comprising:
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receiving, by a wireless device from a first base station, at least one first message comprising; configuration parameters for a plurality of cells comprising a plurality of cell groups comprising; a first cell group for communication with the first base station; and a second cell group for communication with a second base station, the second cell group comprising a licensed assisted access (LAA) cell; and one or more random access channel (RACH) configuration parameters for a RACH of the LAA cell; performing a listen before talk (LBT) procedure to transmit a preamble via the RACH of the LAA cell of the second base station in response to initiating a random access process with the second base station; incrementing a counter in response to the LBT procedure indicating that the channel is occupied; determining a failure of the random access process in response to the counter reaching a first value; and transmitting, by the wireless device to the first base station, at least one second message in response to the failure of the random access process with the second base station, wherein the at least one second message comprises; an indication of the failure of the random access process with the second base station; and one or more parameters indicating that at least one LBT failure occurred during the failed random access process. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A wireless device comprising:
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one or more processors; and memory storing instructions that, when executed by the one or more processors, cause the wireless device to; receive from a first base station, at least one first message comprising; configuration parameters for a plurality of cells comprising a plurality of cell groups comprising; a first cell group for communication with the first base station; and a second cell group for communication with a second base station, the second cell group comprising a licensed assisted access (LAA) cell; and one or more random access channel (RACH) configuration parameters for a RACH of the LAA cell; perform a listen before talk (LBT) procedure to transmit a preamble via the RACH of the LAA cell of the second base station in response to initiating a random access process with the second base station; increment a counter in response to the LBT procedure indicating that the channel is occupied; and determine a failure of the random access process in response to the counter reaching a first value; transmit, to the first base station, at least one second message in response to the failure of the random access process with the second base station, wherein the at least one second message comprises; an indication of the failure of the random access process with the second base station; and one or more parameters indicating that at least one LBT failure occurred during the failed random access process. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification