HSUPA Scheduler Dynamic Grant Allocation
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Solution Overview
Problem
High Speed Uplink Packet Access (HSUPA) protocols face challenges in achieving high uplink throughput and low data rate packet latency while managing interference and retransmissions in multi-cell user traffic scenarios.
Innovation Solution
The proposed solution involves an HSUPA scheduler that dynamically allocates high-grants and minimum-grants to user equipment based on a Rise-over-Thermal (RoT) budget, selecting user equipment for high-grant allocation during each transmission time interval, and adjusting grants to accommodate variations in RoT and interference, using mechanisms like Happy bits and Relative Grant Channels to optimize channel usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-grant allocation is provided to selected user equipment to enhance uplink throughput, then uplink throughput is improved, but interference and rise-over-thermal (RoT) levels increase
Solution Approach 1:
The patent segments user equipment into different categories (selected vs. non-selected) and applies different grant levels (high-grant vs. minimum-grant) accordingly. This segmentation allows the system to optimize throughput for selected UEs while controlling interference from non-selected UEs, resolving the contradiction between throughput improvement and interference management.
Solution Approach 2:
The patent applies local quality by providing differentiated service levels to different user equipment. Selected UEs receive high-grant allocation for enhanced throughput, while non-selected UEs receive minimum-grant allocation. This localized differentiation allows the system to maximize throughput where needed without uniformly increasing interference across all UEs.
2Reliability
If minimum-grant allocation is provided to user equipment to ensure basic communication, then communication reliability is improved, but uplink throughput is reduced
Solution Approach 1:
The patent segments the user equipment population and applies differentiated grant strategies: high-grant to selected UEs for throughput optimization and minimum-grant to non-selected UEs for reliability assurance. This segmentation enables the system to simultaneously achieve high throughput for priority users and reliable basic communication for other users.
Solution Approach 2:
The patent applies partial action by providing minimum-grant (a reduced but sufficient level) to non-selected UEs rather than complete denial of service. This partial provision ensures basic communication reliability while allocating excess resources (high-grant) only to selected UEs where throughput enhancement is prioritized.
3Adaptability or versatility
If dynamic grant allocation is implemented to adapt to changing RoT budget, then system adaptability is improved, but scheduling complexity increases
Solution Approach 1:
The patent implements dynamic grant allocation where the scheduler adapts RoT budget variations by adjusting high-grant and minimum-grant assignments in real-time. The system dynamically selects which UEs receive high-grant based on current RoT conditions, enabling adaptability to changing network conditions while managing complexity through structured decision logic.
Solution Approach 2:
The patent employs feedback mechanisms where the scheduler monitors RoT budget and uses this information to adjust grant allocations. The feedback loop allows the system to adapt to changing conditions by adjusting high-grant/minimum-grant assignments based on actual RoT measurements, balancing adaptability with manageable scheduling complexity through established control algorithms.
Data Source
AI summary
A method, apparatus and computer program product comprises determining a rise-over-thermal (RoT) budget associated with a cell within a communication network for user equipment served by the cell, determining a number of user equipment served by the cell to receive a minimum-grant of an uplink channel, determining a high-grant for allocation to a selected user equipment, the high-grant allowing the selected user equipment to communicate in the uplink channel of the communication network, the high-grant being based on the RoT budget, and allocating the high-grant to the selected user equipment and the minimum-grant to all other user equipment served by the cell.