Grant-less Traffic Interference Mitigation in Wireless Systems
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Solution Overview
Problem
Wireless communication systems face high overhead and interference issues when multiplexing grant-based and grant-less traffic, particularly for small data devices like IoT devices, due to the need for resource allocation and interference mitigation.
Innovation Solution
A method and apparatus for mitigating intra-cell interference by statistically controlling the number of user equipment (UEs) that transmit grant-less traffic, using control information to determine probabilities for grant-less and grant-based traffic transmission in shared slots, employing techniques like time division multiplexing (TDM) and frequency division multiplexing (FDM).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If grant-based method is used for data transmission, then reliability of communication is improved, but overhead increases significantly for small data devices
Solution Approach 1:
The patent segments traffic into two types: grant-based traffic for large data transmissions and grant-less traffic for small data transmissions. This segmentation allows small data devices to use the efficient grant-less method for small payloads while maintaining the reliability of grant-based method when needed, thereby reducing overhead without sacrificing communication reliability.
Solution Approach 2:
The patent dynamically switches between grant-based and grant-less transmission modes based on payload size and channel conditions. The base station dynamically allocates resources and adjusts the transmission mode, allowing the system to adapt to varying data requirements and minimize overhead while maintaining reliable communication.
2Productivity
If grant-less traffic is allowed in shared slots, then productivity is improved, but interference to grant-based traffic increases
Solution Approach 1:
The patent introduces an intermediary mechanism where the base station monitors channel conditions and dynamically controls grant-less access opportunities. This intermediary control allows the system to permit grant-less traffic when channel conditions are favorable, improving productivity while preventing excessive interference to grant-based traffic through coordinated resource allocation.
Solution Approach 2:
The patent changes key parameters such as transmission probability, resource allocation, and power control dynamically based on channel conditions and traffic load. By adjusting these parameters, the system optimizes the balance between allowing grant-less traffic for improved productivity and maintaining acceptable interference levels for grant-based traffic.
Data Source
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AI summary
Aspects of the present disclosure provide for various methods and apparatuses for mitigating intra-cell interference when multiplexing grant-less traffic and grant-based traffic. When a wireless device transmits data without first requesting a grant of certain network resources from a base station, such data transmission may be called grant-less traffic in this disclosure. Different from grant-less traffic, when a wireless device needs to request a grant of certain network resources before transmitting data, such data may be called grant-based traffic in this disclosure.