Method and apparatus for performing backoff of transmission and reception for licensed assisted access in wireless communication system
AssigneeLG Electronics Inc.
InventorsYoungdae Lee, Sunghoon Jung
Life of this patent
Estimating the term…
Abstract
A method and apparatus for delaying transmission or reception on an unlicensed cell in a wireless communication system is provided. A user equipment (UE) performs downlink (DL) reception or uplink (UL) transmission on a second cell. The second cell is a second serving cell on an unlicensed carrier. The UE receives a backoff time for the second cell from a first cell when there is overload in the unlicensed carrier. The first cell is a first serving cell on a licensed carrier. The UE suspends ongoing DL reception or UL transmission on the second cell during the backoff time.
Claims4
A method performed by a user equipment (UE) in a wireless communication system, the method comprising:
- configuring a first cell operating on a licensed carrier and a second cell operating on an unlicensed carrier, wherein the first cell schedules for the second cell;
- performing downlink (DL) reception or uplink (UL) transmission on the second cell;
- detecting an overload on the second cell;
- receiving, from the first cell, an access probability factor and a backoff time for the second cell;
- determining whether or not to suspend ongoing DL reception or UL transmission on the second cell by comparing a generated random number with the access probability factor;
- when the generated random number is higher than the access probability factor, suspending ongoing DL reception or UL transmission on the second cell during the backoff time;
- requesting the first cell for the DL reception or UL transmission on the second cell via a media access control (MAC) control element (CE), after the backoff time elapsed;
- and
- resuming the DL reception or UL transmission on the second cell, upon receiving a response for the request from the first cell,
- wherein the access probability factor and the backoff time are configured differently per frequency of the second cell.
A user equipment (UE) in a wireless communication system, the UE comprising:
- a transceiver configured to transmit or receive a radio signal;
- and
- a processor coupled to the transceiver,
- the processor configured to:
- configure a first cell operating on a licensed carrier and a second cell operating on an unlicensed carrier, wherein the first cell schedules for the second cell;
- perform downlink (DL) reception or uplink (UL) transmission on the second cell,
- detect an overload on the second cell,
- control the transceiver to receive, from the first cell, an access probability factor and a backoff time for the second cell,
- determine whether or not to suspend ongoing DL reception or UL transmission on the second cell by comparing a generated random number with the access probability factor,
- when the generated random number is higher than the access probability factor, suspend ongoing DL reception or UL transmission on the second cell during the backoff time,
- control the transceiver to request the first cell for the DL reception or UL transmission on the second cell via a media access control (MAC) control element (CE), after the backoff time elapsed, and
- control the transceiver to resume the DL reception or UL transmission on the second cell, upon receiving a response for the request from the first cell,
- wherein the access probability factor and the backoff time are configured differently per frequency of the second cell.
Dependencies are inferred from the claim text.