Coordinated Sensing for Wireless Node Interference
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Solution Overview
Problem
Current unlicensed network transmission mechanisms, such as LBT, fail to effectively address hidden node and exposed node issues, leading to inefficient resource usage and interference with other networks, as they only consider transmitter-side channel sensing without receiver feedback.
Innovation Solution
Implement a method where transmission decisions are made based on both transmitter-side Listen Before Talk (LBT) outcomes and receiver-side channel sensing results, allowing the transmitter to adjust its transmission plans according to the interference levels detected by the receiver, thereby reducing the likelihood of hidden node interference and optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmitter-side LBT is used for channel access, then network capacity is improved, but hidden node interference increases
Solution Approach 1:
The patent implements feedback by having the receiver measure the received signal strength indicator (RSSI) and send this measurement back to the transmitter. The transmitter then uses this feedback information to determine whether to proceed with transmission, thereby resolving the hidden node problem where the transmitter cannot detect interfering signals from other nodes.
Solution Approach 2:
The patent adds a new dimension to channel access by introducing receiver-side measurements and feedback. Instead of relying solely on transmitter-side LBT in the time domain, the solution incorporates spatial and signal strength dimensions by having the receiver measure RSSI from potential interferers and report back, creating a multi-dimensional channel assessment mechanism.
2Productivity
If transmitter-side LBT is used for channel access, then resource usage is improved, but exposed node packet loss increases
Solution Approach 1:
The receiver provides feedback about the channel conditions and received signal strength to the transmitter. This feedback enables the transmitter to make more informed transmission decisions, reducing unnecessary transmissions that would cause packet loss in exposed node scenarios while still maintaining efficient resource usage.
Solution Approach 2:
The system performs preliminary channel assessment by having the receiver measure RSSI before the actual data transmission proceeds. This preliminary action at the receiver side allows the transmitter to avoid transmissions that would likely fail due to exposed node conditions, thereby reducing packet loss before it occurs.
3Object-affected harmful factors
If receiver-side sensing is added to LBT, then interference reduction is improved, but device complexity increases
Solution Approach 1:
The receiver performs the sensing measurements using its existing reception capabilities and sends the results back to the transmitter. This self-service approach allows the system to gain receiver-side channel information without requiring separate dedicated sensing hardware at each node, thereby limiting the increase in device complexity.
Solution Approach 2:
The receiver's existing signal reception and measurement capabilities are made multi-functional by using them both for normal data reception and for LBT-related RSSI measurements. This universality allows the system to implement receiver-side sensing without adding dedicated sensing hardware, thus limiting complexity increase while still achieving interference reduction.
Data Source
AI summary
Provided is a method of operating a wireless device in a wireless communication network. The method includes identifying, by a transmitter in the network node, data to transmit according to a data transmission scheme to a receiver in the wireless communication network, determining, by the transmitter in the wireless communication network, first wireless signal power information at the transmitter, receiving into the transmitter, second wireless signal power information at the receiver and comparing the first wireless signal power information to a first power threshold and/or the second wireless signal power information to a second power threshold. Based on comparing the first wireless signal power information to the first power threshold and/or the second wireless signal power information to the second power threshold, transmitting the identified data to the receiver or determining not to transmit the identified data to the receiver.