Uplink Congestion Control via UE-Aided Slow Scheme
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Solution Overview
Problem
In wireless communication systems, the existing Fast Congestion Control (FCC) scheme faces challenges due to high complexity and increased hardware requirements for fast RoT measurement, leading to RoT peaks and increased block error rates, especially for UEs with high QoS requirements, necessitating a more efficient uplink congestion control method.
Innovation Solution
A UE-aided Slow Congestion Control (SCC) scheme is proposed, where user equipment (UEs) receive signaling indicating congestion status and adjust transmission power based on RoT measurements, allowing for E-TFC reselection to mitigate interference and reduce RoT peaks, with power reduction levels determined by DeltaRoT and configurable thresholds, enabling more aggressive congestion control with reduced signaling costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If Fast Congestion Control (FCC) scheme is implemented with fast RoT measurement, then RoT control responsiveness is improved, but device complexity and hardware requirements increase
Solution Approach 1:
The patent segments the congestion control function into two parts: the base station performs traditional slow congestion control based on radio frame-based RoT measurements, while user equipment performs fast congestion control based on TPC command analysis. This segmentation allows fast response without requiring the base station to implement complex fast measurement hardware.
Solution Approach 2:
User equipment autonomously performs fast congestion control by analyzing TPC commands received from the base station and adjusting its own transmission power accordingly. This self-service approach enables fast RoT control responsiveness without adding hardware complexity to the base station, as the UE independently makes power adjustment decisions based on congestion indicators.
2Reliability
If FCC is implemented aggressively to suppress RoT peaks, then RoT control performance is improved, but block error rate increases
Solution Approach 1:
The patent implements partial fast congestion control where only selected user equipment performs fast power adjustment based on TPC command analysis, while other UEs continue with traditional control. This partial application allows RoT peak suppression without excessively impacting all UEs, thereby controlling BLER increases while still achieving improved RoT control performance.
Solution Approach 2:
Fast congestion control is applied locally to specific user equipment that are identified as contributors to RoT peaks, rather than uniformly applying to all UEs. This localized approach allows aggressive RoT control for problematic UEs while maintaining normal operation for others, thus suppressing RoT peaks without causing excessive BLER increases system-wide.
3Device complexity
If radio frame-based RoT measurement is used for congestion control, then device complexity is reduced, but RoT peak suppression speed decreases
Solution Approach 1:
The patent uses TPC commands as an intermediary mechanism to transmit congestion control information from the base station to user equipment. Instead of requiring fast base station measurement hardware, the TPC commands serve as a mediator that conveys congestion status, enabling UEs to perform fast power adjustments based on this intermediary signal while the base station maintains its simpler measurement architecture.
Data Source
AI summary
The present disclosure relates to an uplink congestion control scheme. In one embodiment, an uplink congestion control method is provided, comprising steps of: determining whether or not a congestion status of a serving cell is changed based on a rise over thermal, RoT, measurement; sending to a set of user equipment, UEs, a signaling to indicate the change of the congestion status; and performing an uplink congestion control based on the RoT measurement and with enhanced transmission format combination, E-TFC, reselection by at least one UE from the set of UEs based at least on the signaling.