OFDMA Base Station Resource Scheduling Mode Selection
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Solution Overview
Problem
OFDMA resource schedulers face challenges in optimizing resource allocation between human user communications and machine-to-machine (M2M) devices, leading to potential degradation of quality of service for more important communications due to treating both types of communications identically.
Innovation Solution
An OFDMA base station system dynamically selects between orthogonal and shared scheduling modes based on wireless transmission error data from user equipment, allocating contiguous resources for M2M devices in low-stress conditions and non-contiguous resources in high-stress conditions to ensure fair resource allocation and quality of service for user equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the base station treats user communications and M2M communications as identical in resource allocation, then the resource scheduler implementation is simple, but the quality of service for important communications deteriorates
Solution Approach 1:
The patent segments resource allocation into two distinct modes: orthogonal mode for M2M devices and shared mode for user equipment. This segmentation allows the system to treat different communication types differently, ensuring QoS for user equipment while accommodating M2M devices, thus resolving the contradiction between simple implementation and service quality.
Solution Approach 2:
The patent implements dynamic mode selection between orthogonal and shared scheduling based on current system conditions. The base station monitors transmission error data and traffic load, then dynamically switches between allocation modes. This dynamic approach maintains simple implementation while adapting to ensure quality of service for user communications.
2Productivity
If the base station allocates contiguous resource blocks to M2M devices, then spectral efficiency improves, but resource availability for user equipment deteriorates
Solution Approach 1:
The patent dynamically adjusts resource block allocation based on system load and error conditions. When transmission errors are low and M2M traffic dominates, contiguous blocks are allocated to M2M devices for spectral efficiency. When user equipment needs increase or errors rise, the system switches to shared mode, releasing resources for user equipment. This dynamic adjustment resolves the contradiction between spectral efficiency and resource availability.
Solution Approach 2:
The patent changes the allocation parameter from contiguous to non-contiguous resource blocks based on system conditions. This parameter change allows flexible resource distribution: contiguous blocks when M2M efficiency is prioritized, non-contiguous when user equipment needs are prioritized, resolving the contradiction between spectral efficiency and resource availability.
3Adaptability or versatility
If the base station allocates non-contiguous resource blocks to M2M devices, then resource flexibility improves, but spectral efficiency deteriorates
Solution Approach 1:
The patent implements dynamic switching between contiguous and non-contiguous allocation based on system conditions. Non-contiguous allocation is used when user equipment requires flexible resource access or when M2M traffic is light, ensuring adaptability. Contiguous allocation is used when M2M traffic dominates and spectral efficiency is critical. This dynamic approach resolves the contradiction between flexibility and spectral efficiency.
4Object-affected harmful factors
If the base station uses orthogonal mode for M2M communications, then interference with user equipment is minimized, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent dynamically selects between orthogonal mode (dedicated resources for M2M) and shared mode (common resources for both M2M and user equipment). Orthogonal mode is activated when M2M traffic is heavy and interference protection is critical. Shared mode is activated when resources are abundant or user equipment QoS is prioritized, improving overall utilization. This dynamic selection resolves the contradiction between interference minimization and resource utilization efficiency.
Data Source
AI summary
A base station schedules OFDMA resource blocks for M2M communication devices. The base station exchanges wireless communications with wireless user equipment. From the wireless user equipment, the base station receives transmission error data characterizing the wireless communications transferred from the wireless user equipment. Based on the wireless transmission error data, the base station selects an orthogonal mode or a shared mode for M2M communications. If orthogonal mode is selected, the base station schedules contiguous resource blocks for the M2M devices, so the resource blocks use contiguous frequencies and contiguous timeslots that are not shared with the wireless user equipment. If shared mode is selected, the base station schedules non-contiguous resource blocks for the M2M devices, so the non-contiguous resource blocks use non-contiguous frequencies and non-contiguous timeslots that are shared with the wireless user equipment. The base station receives M2M communications transferred by the M2M devices based on the selected schedule.