US 10,542,460 B2 · Energy detection threshold adaptation for licensed assisted access of LTE in unlicensed band

Abstract

When performing a contention protocol, such as Listen-Before-Talk (LBT), an Long Term Evolution (LTE)-Licensed Assisted Access (LAA) node dynamically adapts the ED threshold used by the LTE-LAA node depending on whether other transmission nodes are detected at the frequency components that are to be used by the LTE-LAA node. In one implementation, the ED threshold value may initially be set to a conservative value, and when other transmissions nodes are not detected, the ED threshold value may be set to a more aggressive value. In another implementation, the ED threshold value may initially be set to a more aggressive value, and only when another transmission node is detected, the ED threshold value may be set to a more conservative value. In yet another possible implementation, the ED threshold value and the transmit power may be proportionally modified, for a particular UE, based on a parameter associated with the UE.

Claims17

Dependent claims

An evolved NodeB (eNB) that functions as a Long Term Evolution (LTE)-Licensed Assisted Access (LAA) transmission point, the eNB comprising circuitry to:

adaptively determine an energy detection (ED) threshold value to use when performing a Listen-Before-Talk (LBT) operation, the adaptive determination including selectively choosing the ED threshold value from at least two or more possible ED threshold values;
and
transmit data, to User Equipment (UE), via LTE-LAA downlink transmission, the transmission including performing the LBT operation using the adaptively determined ED threshold,
wherein the eNB, when adaptively determining the ED threshold, further includes circuitry to:
initially set the ED threshold value to a conservative value;
detect a presence of another, different transmission node;
and change the ED threshold value to an aggressive value when the another, different transmission node is not detected at frequency components corresponding to the LTE-LAA downlink transmission or continue to keep the conservative value.

4 more elements

An evolved NodeB (eNB) comprising circuitry to:

determine whether a WiFi transmission node is detected in a vicinity of the eNB;
determine an energy detection (ED) threshold value based on a result of the determination of whether the WiFi transmission node is detected;
measure an amount of energy associated with an Long Term Evolution (LTE)-Licensed Assisted Access (LAA) channel;
compare the measured amount of energy to the determined ED threshold value;
transmit data, using the channel, when the comparison indicates that the amount of energy associated with the channel is less than the ED threshold value;
and
refrain from transmitting the data when the comparison indicates that amount of energy associated with the channel is greater than the ED threshold value,
wherein the eNB, when determining the ED threshold value, further includes circuitry to:
initially set the ED threshold value to a conservative value;
and
change the ED threshold value to an aggressive value when a WiFi transmission node is determined to not be in the vicinity of the eNB, or
wherein the eNB, when determining the ED threshold value, further includes circuitry to:
initially set the ED threshold value to an aggressive value;
and
change the ED threshold value to a conservative value when the WiFi transmission node is determined to be in the vicinity of the eNB.

12 more elements

Dependencies are inferred from the claim text.

Energy detection threshold adaptation for licensed assisted access of LTE in unlicensed band

Life of this patent

Energy detection threshold adaptation for licensed assisted access of LTE in unlicensed band

Life of this patent

Abstract

Claims17