Asynchronous Wireless MAC Scheduling for Interference Control
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Solution Overview
Problem
Current wireless communication systems face challenges in achieving efficient media access control for asynchronous communication, particularly in reducing interference and ensuring fair resource utilization across nodes, especially in ad-hoc networks like Wi-Fi, which can lead to poor spatial efficiency and limited fairness control.
Innovation Solution
The proposed solution involves a wireless media access control mechanism that allows nodes to communicate asynchronously and schedule transmissions based on consideration of neighboring nodes' activities, using separate frequency division multiplexed control and data channels to minimize interference, and employing a request-grant-confirmation scheme to manage interference and maximize resource reuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If ad-hoc wireless networks are deployed without centralized planning, then deployment flexibility and ease of setup are improved, but spatial efficiency and interference control deteriorate
Solution Approach 1:
The patent implements self-service through distributed scheduling where each node autonomously monitors control messages from neighbors and independently decides whether to request or schedule transmissions based on received power levels and scheduled transmission information, eliminating the need for centralized planning while maintaining efficient resource utilization
Solution Approach 2:
The patent employs feedback mechanisms where nodes transmit control messages containing scheduled transmission timing and power level information, allowing receiving nodes to adjust their transmission decisions based on this feedback, thereby achieving interference mitigation and improved spatial efficiency in ad-hoc networks
2Object-affected harmful factors
If interference mitigation techniques such as carrier sense multiple access are employed, then interference between nodes is reduced, but utilization efficiency and fairness control deteriorate
Solution Approach 1:
The patent implements dynamic transmission scheduling where nodes continuously monitor control messages and adjust their transmission requests and parameters based on real-time network conditions, enabling both interference mitigation and high utilization efficiency through adaptive decision-making
Solution Approach 2:
The patent utilizes parameter changes by having nodes adjust transmission power levels, timing, and scheduling based on received control messages containing power level and scheduled transmission information, achieving both interference reduction and efficient resource utilization through dynamic parameter optimization
3Ease of operation
If nodes transmit without considering neighboring nodes' activities, then transmission simplicity is improved, but interference and reception reliability deteriorate
Solution Approach 1:
The patent applies preliminary action by having nodes monitor and analyze control messages from neighboring nodes before initiating transmissions, allowing them to predict potential interference and adjust their transmission requests accordingly, thereby maintaining both simplicity and reliability
Data Source
AI summary
A wireless media access control supports asynchronous communication and overlapping transmissions. Here, a wireless node may determine whether to request or schedule a transmission based on control messages it receives from neighboring nodes. In some implementations a scheduled transmission may be divided up into several segments so that a transmitting node may receive and transmit control messages between segments. In some implementations a monitoring period is defined after a scheduled transmission period to enable the transmitting node to acquire control information that may otherwise have been transmitted during the scheduled transmission period. In some implementations data and control information are transmitted over different frequency division multiplexed channels to enable concurrent transmission of the data and control information.