Uplink OFDMA Resource Allocation via SINR Target Optimization
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Solution Overview
Problem
Current LTE uplink scheduling methods face challenges in efficiently allocating radio frequency resources due to power limitations and interference, leading to suboptimal channel utilization and performance, especially when prioritizing users based on quality of service and varying radio propagation conditions.
Innovation Solution
A method and arrangement that generate candidate Signal to Interference and Noise Ratio (SINR) target values, estimate received signal power for each user equipment, compute and allocate resource blocks based on these values, and select an optimal SINR target to control received power density and SINR, thereby optimizing resource allocation and channel utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If priority based resource allocation is used to select users, then quality of service is improved, but power limitations of user equipment cause suboptimal channel utilization
Solution Approach 1:
The patent changes the parameter being optimized from pure priority-based allocation to SINR-based allocation. By using Signal to Interference plus Noise Ratio as the scheduling metric, the system adapts resource allocation to actual channel conditions and power limitations, improving both QoS and channel utilization simultaneously
2Productivity
If more radio frequency resources are allocated to selected users, then user throughput is improved, but interference from multiple users decreases SINR
Solution Approach 1:
The patent introduces feedback through SINR measurements. The base station measures the actual SINR for each user and uses this feedback to dynamically adjust resource allocation. This closed-loop approach ensures that resources are allocated efficiently while accounting for interference levels, maintaining both throughput and signal quality
3Productivity
If scheduler assigns more resource blocks to users, then data transmission capacity is improved, but received power density decreases due to power distribution
Solution Approach 1:
The patent changes the allocation parameter from raw resource block count to SINR-weighted allocation. By considering the ratio of signal power to interference plus noise, the system optimizes the effective use of allocated resources, ensuring that users receive adequate power density even when multiple users are served simultaneously
Data Source
AI summary
A method and arrangement in a node for allocating transmission resources is presented. The present method and arrangement for scheduling, allocates frequency resources based on the received signal power of user equipment. Thus in particular uplink power can be better utilized. According to the present method and arrangement the resource blocks are distributed so that the SINR of all scheduled user equipments reach a selected SINR target. The selection of SINR targets may be static or dynamic. Further, according to the present method and arrangement, optimization of system and user performance may be combined.