Autonomous Uplink Parameter Modification for Pathloss Compensation
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Solution Overview
Problem
In wireless communication networks, especially non-terrestrial networks, the large round trip delay hinders quick link adaptation, leading to packet loss when channel conditions change, as user equipment (UE) cannot increase transmit power beyond maximum limits to compensate for pathloss degradation.
Innovation Solution
User equipment (UE) autonomously modifies transmission parameters such as modulation and coding schemes, transport block size, or resource allocation for uplink communications without base station instructions, based on measured pathloss, to compensate for increased pathloss without exceeding maximum transmit power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE increases transmit power to compensate for pathloss degradation, then the uplink communication reliability improves, but the UE cannot exceed maximum transmit power limits
Solution Approach 1:
The UE changes transmission parameters other than power (modulation order, coding rate, transport block size, resource allocation) to adapt to channel conditions when maximum power is reached, allowing continued reliability improvement through parameter optimization rather than power increase
2Measurement precision
If the base station provides instructions for transmission parameter modifications, then the link adaptation accuracy improves, but the round trip delay increases
Solution Approach 1:
The UE autonomously modifies transmission parameters based on its own pathloss measurements and channel conditions without waiting for base station instructions, eliminating round trip delay while maintaining adaptation accuracy through self-driven decision making
Solution Approach 2:
The UE performs link adaptation in advance by autonomously adjusting parameters before base station feedback is received, proactively compensating for channel changes rather than reactively responding to base station commands
3Manufacturing precision
If the UE waits for base station feedback to modify transmission parameters, then the parameter modification accuracy improves, but the packet loss increases
Solution Approach 1:
The UE independently determines and applies parameter modifications based on its own measurements, eliminating the timing gap between channel degradation and parameter adjustment that causes packet loss, while maintaining accuracy through autonomous channel quality assessment
Data Source
AI summary
Some techniques and apparatuses described herein enable a user equipment (UE) to autonomously modify one or more transmission parameters, other than a transmit power, for uplink communications after detecting a change in pathloss. The UE may modify the one or more transmission parameters without receiving instructions from a base station, such as in downlink control information, with updated value(s) for the one or more transmission parameters. As a result, the UE and the base station avoid the round trip delay that would otherwise be required to modify the transmission parameter(s) and perform link adaptation. Some techniques and apparatuses described herein apply to non-terrestrial networks with a large round trip delay. Other aspects are described.