Timing advance in LBT systems
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsAmitav Mukherjee, Yu Yang
Life of this patent
Estimating the term…
Abstract
Systems and methods relating to a Timing Advance (TA) in a Listen-Before-Talk (LBT) cell are disclosed. In some embodiments, a method of operation of a radio access node in a cellular communications network comprises transmitting an indication of a TA for uplink LBT for a LBT cell to be used by a wireless device. In this manner, timing of the uplink LBT procedure can be controlled such that at least a portion of the LBT duration occurs during a time period in which downlink transmission on the LBT cell does not interfere with the LBT procedure.
Claims19
A method of operation of a radio access node in a cellular communications network, comprising:
- transmitting an indication of a Timing Advance, TA, for uplink Listen-Before-Talk, LBT, for an LBT cell to be used by a wireless device;
- wherein the TA for uplink LBT is such that at least part of an uplink LBT duration for an uplink LBT procedure performed by the wireless device falls within a time period having a duration that is equal to a one-way propagation delay, T1, between a radio access node providing the LBT cell and the wireless device, the time period starting at a time of transmission of a last downlink subframe in a downlink burst on the LBT cell at the radio access node providing the LBT cell.
A radio access node for a cellular communications network, the radio access node adapted to:
- transmit an indication of a Timing Advance, TA, for uplink Listen-Before-Talk, LBT, for an LBT cell to be used by a wireless device;
- wherein the TA for uplink LBT is such that at least part of an uplink LBT duration for an uplink LBT procedure performed by the wireless device falls within a time period having a duration that is equal to a one-way propagation delay, T1, between a radio access node providing the LBT cell and the wireless device, the time period starting at a time of transmission of a last downlink subframe in a downlink burst on the LBT cell at the radio access node providing the LBT cell.
A radio access node for a cellular communications network, comprising:
- at least one processor;
- and
- memory comprising instructions executable by the at least one processor whereby the radio access node is operable to:
- effect transmitting an indication of a Timing Advance, TA, for uplink Listen-Before-Talk, LBT, for an LBT cell to be used by a wireless device;
- wherein the TA for uplink LBT is such that at least part of an uplink LBT duration for an uplink LBT procedure performed by the wireless device falls within a time period having a duration that is equal to a one-way propagation delay, T1 between a radio access node providing the LBT cell and the wireless device, the time period starting at a time of transmission of a last downlink subframe in a downlink burst on the LBT cell at the radio access node providing the LBT cell.
A method of operation of a wireless device in a cellular communications network, comprising:
- receiving, from a radio access node, an indication of a Timing Advance, TA, for uplink Listen-Before-Talk, LBT, for an LBT cell;
- and
- performing an uplink LBT procedure for the LBT cell according to the TA for uplink LBT;
- wherein the TA for uplink LBT is such that at least part of an uplink LBT duration for the uplink LBT procedure performed by the wireless device falls within a time period having a duration that is equal to a one-way propagation delay, T1, between the radio access node providing the LBT cell and the wireless device, the time period starting at a time of transmission of a last downlink subframe in a downlink burst on the LBT cell at the radio access node providing the LBT cell and ending at a time of receipt of the last downlink subframe in the downlink burst on the LBT cell at the wireless device.
A wireless device enabled to operate in a cellular communications network, the wireless device adapted to:
- receive, from a radio access node, an indication of a Timing Advance, TA, for uplink Listen-Before-Talk, LBT, for an LBT cell;
- and
- perform an uplink LBT procedure for the LBT cell according to the TA for uplink LBT;
- wherein the TA for uplink LBT is such that at least part of an uplink LBT duration for the uplink LBT procedure performed by the wireless device falls within a time period having a duration that is equal to a one-way propagation delay, T1, between a radio access node providing the LBT cell and the wireless device, the time period starting at a time of transmission of a last downlink subframe in a downlink burst on the LBT cell at the radio access node providing the LBT cell.
A wireless device for a cellular communications network, comprising:
- at least one processor;
- and
- memory comprising instructions executable by the at least one processor whereby the wireless device is operable to:
- receive, from a radio access node, an indication of a Timing Advance, TA, for uplink Listen-Before-Talk, LBT, for an LBT cell;
- and
- perform an uplink LBT procedure for the LBT cell according to the TA for uplink LBT;
- wherein the TA for uplink LBT is such that at least part of an uplink LBT duration for the uplink LBT procedure performed by the wireless device falls within a time period having a duration that is equal to a one-way propagation delay, T1, between a radio access node providing the LBT cell and the wireless device, the time period starting at a time of transmission of a last downlink subframe in a downlink burst on the LBT cell at the radio access node providing the LBT cell.
Dependencies are inferred from the claim text.