Random access process in carrier aggregation
First Claim
Patent Images
1. A method comprising:
- receiving, by a wireless device;
at least one radio resource control (RRC) message indicating a maximum counter value; and
a control order to transmit a preamble as a part of a random access (RA) procedure on a cell;
instructing, a physical layer by a medium access control (MAC) layer, to transmit the preamble on the cell; and
when a corresponding RA response is not received;
considering the RA procedure unsuccessfully completed if a preamble transmission counter reaches the maximum counter value regardless of whether the cell is a licensed or licensed-assisted-access (LAA) cell, wherein the preamble transmission counter is configured to count a number of physical layer transmissions of the preamble,otherwise considering the RA procedure unsuccessfully completed if a preamble transmission opportunity counter reaches the maximum counter value and the cell is a LAA cell, wherein;
the preamble transmission opportunity counter is employed only if the cell is a LAA cell,the preamble transmission opportunity counter is configured to be increased when the physical layer performs listen-before-talk (LBT) for transmission of the preamble; and
the preamble transmission opportunity counter is configured to limit a time duration that the preamble is used for the RA procedure on the cell.
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Accused Products
Abstract
A MAC layer instructs a physical layer to transmit a preamble as a part of a random access (RA) procedure on a licensed assisted access (LAA) cell. The wireless device performs an LBT for transmission of the preamble. The wireless device considers the RA procedure unsuccessfully completed if a first condition based on a first counter is met. The wireless device considers the RA procedure unsuccessfully completed if a condition based on a second counter is met.
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Citations
20 Claims
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1. A method comprising:
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receiving, by a wireless device; at least one radio resource control (RRC) message indicating a maximum counter value; and a control order to transmit a preamble as a part of a random access (RA) procedure on a cell; instructing, a physical layer by a medium access control (MAC) layer, to transmit the preamble on the cell; and when a corresponding RA response is not received; considering the RA procedure unsuccessfully completed if a preamble transmission counter reaches the maximum counter value regardless of whether the cell is a licensed or licensed-assisted-access (LAA) cell, wherein the preamble transmission counter is configured to count a number of physical layer transmissions of the preamble, otherwise considering the RA procedure unsuccessfully completed if a preamble transmission opportunity counter reaches the maximum counter value and the cell is a LAA cell, wherein; the preamble transmission opportunity counter is employed only if the cell is a LAA cell, the preamble transmission opportunity counter is configured to be increased when the physical layer performs listen-before-talk (LBT) for transmission of the preamble; and the preamble transmission opportunity counter is configured to limit a time duration that the preamble is used for the RA procedure on the cell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method comprising:
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receiving, by a wireless device, at least one radio resource control (RRC) message indicating a maximum counter value; instructing, a physical layer by a medium access control (MAC) layer, to transmit a preamble as a part of a random access (RA) procedure on a licensed assisted access (LAA) cell; performing a listen-before-talk (LBT) for transmission of the preamble at a transmission opportunity of the preamble; when a corresponding RA response is not received; increasing a preamble transmission counter when the LBT is successful; increasing a preamble transmission opportunity counter when the LBT is performed regardless of success or failure of the LBT; and considering the RA procedure unsuccessfully completed if the preamble transmission counter reaches the maximum counter value, otherwise considering the RA procedure unsuccessfully completed if the preamble transmission opportunity counter reaches the maximum counter value. - View Dependent Claims (12, 13, 14, 15)
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16. 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 at least one radio resource control (RRC) message indicating a maximum counter value; instruct, a physical layer by a medium access control (MAC) layer, to transmit a preamble as a part of a random access (RA) procedure on a licensed assisted access (LAA) cell; perform a listen-before-talk (LBT) for transmission of the preamble at a transmission opportunity of the preamble; when a corresponding RA response is not received; increase a preamble transmission counter when the LBT is successful; increase a preamble transmission opportunity counter when the LBT is performed regardless of success or failure of the LBT; and consider the RA procedure unsuccessfully completed if the preamble transmission counter reaches the maximum counter value, otherwise consider the RA procedure unsuccessfully completed if the preamble transmission opportunity counter reaches the maximum counter value. - View Dependent Claims (17, 18, 19, 20)
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Specification