Downlink Power Control for Lost Frame Portions
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Solution Overview
Problem
User equipment (UE) experiences frame portion loss during tune-away periods between different radio access technologies, leading to degraded downlink transmission performance due to incomplete reception of downlink frames.
Innovation Solution
The UE determines lost and receivable frame portions and adjusts the signal-to-interference ratio target value to increase the transmit power for the receivable portions, using proportional adjustments based on the frame length and independent of the base station, to ensure higher signal quality and accurate symbol recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE performs tune-away between different radio access technologies, then the UE can access multiple networks, but portions of downlink frames are lost during the tune-away period
Solution Approach 1:
The base station is informed in advance about the scheduled tune-away periods, allowing it to pre-prepare power control adjustments. The network side proactively compensates for the expected frame loss by adjusting transmit power before the tune-away occurs, rather than reacting after the loss is detected
Solution Approach 2:
Instead of uniformly adjusting power across the entire frame, the power control mechanism applies localized power boosting specifically to the portions of frames that will be received during tune-away periods. This targeted approach increases reliability for critical portions without unnecessarily increasing overall power consumption
2Reliability
If the transmit power is increased for all frame portions, then the signal quality improves, but the power consumption increases
Solution Approach 1:
The power control mechanism applies power adjustments selectively to specific portions of frames rather than uniformly across all transmissions. The base station identifies which frame portions will be received by the UE and applies power boosting only to those portions, maintaining signal quality where needed while avoiding unnecessary power consumption
Solution Approach 2:
Instead of applying full power control adjustments to all frame portions, the mechanism applies partial adjustments only to the extent necessary for the receivable portions. This proportional approach ensures adequate signal quality for successful reception without excessive power consumption
3Reliability
If the downlink transmit power is increased to compensate for lost portions, then the information bit recovery improves, but the interference to other users increases
Solution Approach 1:
The power control adjustments are applied locally to specific frame portions destined for the UE experiencing tune-away, rather than increasing power across all downlink transmissions. This targeted approach improves information bit recovery for the affected UE while minimizing interference generation to other users in the network
Solution Approach 2:
The mechanism applies power adjustments only to the extent necessary for compensating the specific loss caused by tune-away, using proportional adjustments based on the fraction of the frame that will be received. This avoids excessive power increases that would generate unnecessary interference to other users
Data Source
AI summary
Systems, methods, apparatuses, and media are provided for downlink power control. Embodiments include determination that a portion of a frame to be transmitted in a downlink from a base station to a user equipment (UE) may be lost by the UE. Embodiments further include determination that a portion of the frame will be received by the UE. Embodiments further include causing a transmit power of the base station to be increased for the portion of the frame that will be received.