E-DCH Scheduling via Local Power Calculation
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in scheduling transmissions via Enhanced Dedicated Channels (E-DCH), particularly in calculating and managing transmit power and selecting optimal transport format combinations (TFCs), which affects uplink coverage, throughput, and latency.
Innovation Solution
A method and apparatus that calculates scheduled power and remaining transmit power for E-DCH transmissions, generating a rate request message to select TFCs and multiplex data, utilizing a scheduling grant processing unit, remaining transmit power computing unit, and rate request processing unit to optimize E-DCH scheduling, avoiding complex power propagation and synchronization issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex power propagation and synchronization methods are used for E-DCH scheduling, then power allocation accuracy may improve, but device complexity and processing overhead increase
Solution Approach 1:
The patent extracts the power calculation function from complex propagation models and implements it directly at the WTRU device through dedicated computing units. The remaining transmit power computing unit calculates power locally without requiring complex network-side propagation analysis, thereby reducing network device complexity while maintaining power allocation accuracy.
Solution Approach 2:
The WTRU performs self-service by autonomously calculating its own remaining transmit power and generating rate request messages based on local measurements and computations. The scheduled power computing unit and remaining transmit power computing unit enable the device to determine optimal transmission parameters independently, reducing the need for complex network coordination and synchronization.
2Productivity
If more detailed power calculation and TFC selection processes are implemented, then uplink throughput improves, but transmission latency increases
Solution Approach 1:
The patent implements preliminary action by pre-calculating scheduled power for multiple data flows and determining remaining transmit power before actual transmission. The scheduled power computing unit and remaining transmit power computing unit perform computations in advance, allowing the WTRU to quickly select optimal TFCs and generate rate request messages without delays during actual transmission, thereby improving throughput while minimizing latency.
3Productivity
If multiple data flows are multiplexed on E-DCH, then resource utilization improves, but scheduling complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the scheduling function into separate dedicated computing units: a scheduled power computing unit for each data flow and a remaining transmit power computing unit. This segmentation allows independent calculation and management of multiple data flows, simplifying the scheduling process while enabling efficient multiplexing of multiple flows on the E-DCH through systematic power allocation.
Data Source
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AI summary
A method and apparatus for scheduling transmissions via an enhanced dedicated channel (E-DCH) are disclosed. A scheduled powe (240) is calculated for scheduled data flows. A remaining transmit power (265) is calculated for the E-DCH transmission. A rate request message (270) is generated, wherein the scheduled power (240), remaining transmit power (265) and rate request message (270) are used to select transport format combinations (TFCs) and multiplex data scheduled for the E- DCH transmission. The remaining transmit power (265) is calculated by subtracting from a maximum allowed power the power of a dedicated physical data channel (DPDCH), a dedicated physical control channel (DPCCH), a high speed dedicated physical control channel (HS-DPCCH), an enhanced uplink dedicated physical control channel (E-DPCCH) and a power margin.