Enhanced scheduling information transmission in a heterogeneous network

摘要

In a heterogeneous network environment where both high and low power nodes are sharing the same channel/frequency, explicit signaling in a downlink control message is used to select whether scheduling information SI is to be transmitted by a user equipment UE with a data payload or without a data payload. For the case where the selection is that SI is to be transmitted with a data payload, the downlink control message is used for the UE to select a transport format combination TFC for transmission of the SI with the data payload. Else for the case where the selection is that SI is to be transmitted without a data payload, the downlink control message is used for the UE to select transmit power for the transmission of the SI without the data payload.

主权项

1. A method, comprising:
selecting, by circuitry using explicit signaling in a downlink control message, whether user equipment is to transmit scheduling information with a data payload or without a data payload; using, by the circuitry when the user equipment is to transmit the scheduling information with the data payload, the downlink control message for the user equipment to select a transport format combination for transmission of the scheduling information with the data payload; and using, by the circuitry when the user equipment is to transmit the scheduling information without the data payload, the downlink control message for the user equipment to select a transmit power for transmission of the scheduling information without the data payload, wherein the user equipment autonomously switches from transmission of the scheduling information with the data payload to transmission of the scheduling information without the data payload when a power backoff value is larger than a serving grant power for the user equipment, the power backoff value is indicated by the downlink control message and the power backoff value is used for the user equipment to select the transport format combination, and the transmit power for the transmission of the scheduling information without the data payload, after the autonomous switching by the user equipment, is not based on a transmit power for a resource grant by a serving node of the user equipment as indicated by downlink radio resource control signaling.