NOMA Resource Allocation via Overlapping SR and Data Regions
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Solution Overview
Problem
Current wireless communication systems face challenges in supporting massive connectivity and low power services with flexible data rate and latency requirements, particularly in next-generation 5G systems for Wireless Sensor Networks and Massive Machine Type Communication, where existing technologies struggle to efficiently manage non-orthogonal multiple access schemes.
Innovation Solution
The proposed method involves determining data resource groups based on scheduling request (SR) reception reliability, allowing overlapping transmission of SR and uplink data in physical resource regions, enabling efficient non-orthogonal multiple access (NOMA) communication between base stations and user equipment by allocating SR and data resource groups in an overlapping manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SR and uplink data are transmitted using orthogonal resource allocation, then interference between SR and data is minimized, but resource utilization efficiency decreases and connectivity density is limited
Solution Approach 1:
The patent combines SR transmission and uplink data transmission into the same time-frequency resource region by allocating overlapping resource groups. The base station determines data resource groups based on SR reception reliability metrics (detection error rate or ACK ratio), then allows terminals to transmit both SR and uplink data in overlapping regions, thereby improving resource utilization while maintaining reliable SR reception through reliability-based resource selection.
Solution Approach 2:
The patent changes the resource allocation parameter from strictly orthogonal to partially overlapping by controlling the degree of overlap between SR resource groups and data resource groups. The base station adjusts resource group allocation based on SR reception reliability parameters, dynamically changing the resource allocation strategy to balance between interference minimization and resource efficiency.
2Quantity of substance
If more resource groups are allocated for massive connectivity, then connectivity density increases, but system complexity and interference management difficulty increase
Solution Approach 1:
The patent segments the resource pool into multiple data resource groups and SR resource groups, allowing independent management and allocation of each group based on SR reception reliability. This segmentation enables the system to handle massive connectivity by dividing the complex resource allocation problem into manageable groups, reducing overall system complexity while increasing connectivity density.
Solution Approach 2:
The patent introduces SR reception reliability as a new parameter for resource group allocation, changing the allocation strategy from uniform to reliability-based. By using detection error rate or ACK ratio as allocation criteria, the system can efficiently manage numerous resource groups for massive connectivity without proportionally increasing complexity, as automated reliability-based allocation simplifies the management process.
3Measurement precision
If SR transmission region and data transmission region are separated, then SR detection accuracy is improved, but resource waste increases and latency increases
Solution Approach 1:
The patent merges SR transmission and uplink data transmission into overlapping resource regions, eliminating the need for separate transmission regions. This merging reduces resource waste and transmission latency by allowing simultaneous SR and data transmission, while SR detection accuracy is maintained through reliability-based resource group selection and interference management techniques.
Solution Approach 2:
The patent introduces resource group allocation based on SR reception reliability as an intermediary mechanism that enables overlapping transmission while protecting SR detection accuracy. The reliability-based allocation acts as a mediator that balances the conflicting requirements of simultaneous transmission and accurate detection, allowing both goals to be achieved together.
Data Source
AI summary
A method for performing non-orthogonal multiple access (NOMA) scheme-based communication by a base station may comprise the steps of: determining at least one transmission data resource group on the basis of a scheduling request (SR) reception reliability; transmitting information on the determined at least one data resource group to a terminal; and receiving uplink data from the terminal via a predefined uplink data transmission area in the at least one data resource group, wherein the at least one data resource group and an SR resource group including an SR transmission area, in which an SR can be transmitted, are overlappingly allocated in a physical resource area, and the predefined uplink data transmission area within the at least one data resource group and the SR transmission area of the SR resource group overlap each other in the physical resource area.