Node B Uplink Scheduling for E-DCH Power Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing E-DCH systems are inefficient in uplink scheduling and rate controlling due to the slow response time and TFC subset restrictions imposed by the RNC, which hinders quick adaptation to transmission changes and accurate interference control.
Innovation Solution
The method involves Node B taking control of uplink scheduling and rate controlling functions, allowing it to directly manage transmit power restrictions, enabling faster response times and more efficient power control by signaling a transmit power offset based on a reference value, rather than relying on TFC subset restrictions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the RNC performs uplink scheduling and rate controlling functions with TFC subset restrictions, then centralized control is maintained, but response time to transmission changes is slow and uplink scheduling efficiency is reduced
Solution Approach 1:
The patent extracts the uplink scheduling and rate controlling functions from the RNC and relocates them to the base station. This allows the base station to independently manage TFC subsets and transmit power restrictions without waiting for RNC decisions, thereby reducing response time while maintaining centralized control through RNC configuration of initial parameters.
Solution Approach 2:
The patent segments the control functions into two levels: the RNC maintains high-level configuration and oversight, while the base station handles real-time scheduling decisions. This segmentation allows fast local response at the base station while preserving centralized management at the RNC level.
2Reliability
If the RNC imposes TFC subset restrictions on the base station, then rate controlling is maintained, but uplink scheduling efficiency is reduced due to additional signaling overhead
Solution Approach 1:
The base station is empowered to autonomously select and manage TFC subsets based on current channel conditions and interference levels, without requiring continuous RNC intervention. This self-service capability eliminates signaling overhead while maintaining rate controlling through locally adaptive decisions.
Solution Approach 2:
The TFC subset configuration becomes dynamic at the base station, allowing real-time adaptation to changing transmission conditions. The base station can quickly adjust which TFCs are allowed based on current system state, improving scheduling efficiency compared to static RNC-imposed restrictions.
3Reliability
If transmit power control is managed by the RNC through TFC subset restrictions, then power control is maintained, but interference control accuracy is reduced
Solution Approach 1:
The base station acts as an intermediary between the RNC and user equipment for power control. It receives initial power parameters from the RNC but performs real-time adjustments based on measured interference and channel conditions, thereby improving interference control accuracy while maintaining the hierarchical control structure.
Solution Approach 2:
The base station implements closed-loop feedback control for transmit power management by continuously monitoring interference levels and channel quality, then adjusting TFC selections and power restrictions accordingly. This feedback mechanism enables more accurate interference control compared to open-loop RNC-based restrictions.
Data Source
AI summary
A method of scheduling for an Enhanced Dedicated Channel (E-DCH) in a user equipment (UE) is disclosed. More specifically, a method of receiving an information indicating an allowable transmit power range from a base station and updating a group of Transport Format Combinations (TFCs) allowed by the base station by selecting the TFCs that can be used within the allowable transmit power range. Furthermore, the method comprises transmitting the E-DCH by at least one TFC selected from the group of TFCs.