Cooperative MAC Layer Partner-to-Send Frame for Hidden Node Interference
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Solution Overview
Problem
Wireless communication networks face interference and data loss due to hidden nodes, which existing handshaking techniques like RTS/CTS do not fully address, leading to inefficiencies in network performance.
Innovation Solution
The implementation of a cooperative MAC (CMAC) layer with carrier sensing multiple access and polling, incorporating a partner-to-send (PTS) frame to enhance data transmission reliability through coded cooperative communication, where relay stations decode and re-encode data frames to improve signal quality and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RTS/CTS handshaking is used to address hidden nodes, then interference and data loss are reduced, but network efficiency remains insufficient due to incomplete hidden node coverage
Solution Approach 1:
The patent introduces a partner station as an intermediary node that receives both RTS and CTS frames and transmits a PTS frame. This mediator extends the handshaking coverage to include stations that are hidden from either the source or destination, enabling them to detect the ongoing transmission and avoid interference, thus improving reliability without significant efficiency loss
Solution Approach 2:
The patent adds a new dimension to the traditional two-node handshaking by introducing a third node (partner station) that operates in a different communication dimension. The partner station receives frames from both source and destination and transmits back to both, creating a multi-dimensional handshaking protocol that covers hidden nodes outside the traditional line-of-sight communication path
2Reliability
If relay stations are added for cooperative communication, then signal quality and interference reduction improve, but device complexity increases
Solution Approach 1:
The patent makes existing wireless stations multi-functional by enabling them to operate as source, destination, or partner stations interchangeably. Any station can function as a relay/partner node when needed, eliminating the need for dedicated relay infrastructure and reducing overall network complexity while maintaining signal quality improvements through cooperative communication
3Object-affected harmful factors
If partner stations transmit PTS frames to alert hidden nodes, then hidden node interference is reduced, but use of energy increases due to additional transmissions
Solution Approach 1:
The patent applies partial action by having partner stations transmit PTS frames only when they detect both RTS and CTS frames, indicating a hidden node scenario. The PTS transmission is not continuous but triggered only when needed to address specific hidden node situations, reducing overall energy consumption compared to continuous transmission protocols
Data Source
AI summary
A complementary medium access control (CMAC) method and apparatus are described. A method of wireless communication includes transmitting a request-to-send (RTS) frame and transmitting a clear-to-send (CTS) frame. The method also includes transmitting a partner-to-send (PTS) frame. A wireless network includes a source station adapted to transmit a RTS frame and a destination station adapted to transmit a CTS frame. The wireless network also includes a partner station adapted to send a PTS frame.