User Device Beam Management with Receiver LBT for Hidden Nodes
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing beam-based transmissions in unlicensed spectrum due to the inefficiencies of current Listen-before-Talk (LBT) procedures, particularly at high frequencies, which lead to increased hidden node problems and interference.
Innovation Solution
Implement a receiver-activated LBT protocol that includes a clear-channel signaling mechanism, where the receiver determines channel occupancy and transmits a clear-channel signal, allowing the transmitter to proceed only if the channel is free, and an interference control unit to schedule transmissions to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional LBT procedures are used in beam-based transmissions at high frequencies, then channel access is controlled, but hidden node problems and interference increase
Solution Approach 1:
The patent inverts the traditional LBT approach by having the receiver perform channel sensing and send a clear-channel signal instead of the transmitter performing LBT. This reversal allows the node closest to potential interferers (the receiver) to detect hidden node conditions and inform the transmitter, thereby solving the hidden node problem while maintaining controlled channel access
Solution Approach 2:
The patent introduces a clear-channel signal as an intermediary mechanism between the receiver and transmitter. This signal acts as a mediator that conveys channel status information from the receiver to the transmitter, enabling coordinated transmission decisions that reduce interference and hidden node problems while maintaining reliable channel access control
2Object-affected harmful factors
If receiver performs channel sensing and sends clear-channel signal, then hidden node problems are reduced, but communication protocol complexity increases
Solution Approach 1:
The patent extracts the channel sensing function from the transmitter and relocates it to the receiver. This separation allows the receiver to independently perform sensing and send clear-channel signals, simplifying the transmitter's role while effectively addressing hidden node problems through the receiver's local channel knowledge
3Object-affected harmful factors
If interference control unit schedules transmissions, then interference is minimized, but network latency increases
Solution Approach 1:
The interference control unit performs preliminary scheduling of transmissions based on predicted interference conditions and channel state information. By pre-coordinating transmission opportunities before actual data transfer, the system minimizes interference while reducing latency that would otherwise result from reactive interference avoidance during transmission
Data Source
AI summary
A first transceiver for a wireless communication system according to an embodiment is to determine information on an occupancy of a transmission channel. Moreover, the first transceiver is to transmit the information on the occupancy of the transmission channel to a second transceiver. Furthermore, the first transceiver is to determine the information on the occupancy of the transmission channel and to transmit the information on the occupancy of the transmission channel to the second transceiver without having received from the second transceiver a ready-to-transmit message with which the second transceiver would inform the first transceiver that the second transceiver intends to transmit user data to the first transceiver.