Channel Sensing Timing in Unlicensed Wireless Bands
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Solution Overview
Problem
In wireless communication systems, especially in unlicensed bands, existing channel sensing methods face challenges in efficiently determining channel occupancy and optimizing transmission timing, leading to reduced channel occupancy probability and potential interference.
Innovation Solution
A method for performing channel sensing in unlicensed bands, where a transmitting node receives a control signal with a data transmission indication and an indicator for the channel sensing operation, allowing channel sensing to occur before or after the data transmission start timing, incorporating back-off counter-based clear channel assessment and reservation signal transmission to optimize channel access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel sensing is performed using existing methods in unlicensed bands, then channel occupancy can be determined, but channel occupancy probability is reduced and interference increases
Solution Approach 1:
The patent applies preliminary action by performing channel sensing operations before data transmission starts. The transmitting node receives a control signal indicating data transmission and performs channel sensing (including back-off counter-based clear channel assessment) in advance during a specified section, ensuring the channel is ready for transmission without causing interference to other nodes.
Solution Approach 2:
The patent implements dynamics by allowing flexible timing for channel sensing operations. The sensing can be performed during a section indicated by the control signal, which may be before data transmission start timing or after a back-off period. This dynamic timing adjustment optimizes channel occupancy probability while reducing interference based on real-time channel conditions.
2Object-generated harmful factors
If channel sensing is performed before data transmission start timing, then interference is reduced, but channel occupancy probability decreases due to timing constraints
Solution Approach 1:
The patent performs channel sensing operations in advance of data transmission by receiving a control signal and executing clear channel assessment during a specified section before transmission starts. This preliminary sensing ensures the channel is clear while maintaining timing coordination with the network.
Solution Approach 2:
The patent changes the timing parameter of channel sensing operations by allowing flexible scheduling within a section indicated by the control signal. The sensing can occur at different times relative to data transmission start, including during a back-off period, which adjusts the timing parameter to optimize both interference reduction and channel occupancy probability.
3Reliability
If flexible channel sensing timing is allowed, then channel occupancy probability increases, but system complexity increases due to coordination requirements
Solution Approach 1:
The patent uses the control signal as an intermediary to coordinate flexible channel sensing timing. The control signal, received from the network, contains indications for the section in which channel sensing should be performed. This intermediary mechanism simplifies coordination by providing clear instructions from the network rather than requiring complex peer-to-peer negotiation between nodes.
Solution Approach 2:
The patent implements feedback through the control signal that provides information about the appropriate section for channel sensing operations. The transmitting node receives feedback from the network regarding timing and performs sensing accordingly, creating a closed-loop system that optimizes channel occupancy while maintaining coordination simplicity through network-directed instructions.
Data Source
AI summary
One embodiment of the present invention relates to a method for channel sensing within an unlicensed band in a wireless communication system. The method is performed by a transmission node which performs the channel sensing, and may comprises the steps of: receiving, from a control node, a control signal including data transfer indication; receiving, from the control node, an indicator indicating an interval at which a channel-sensing related operation associated with the data transfer indication is performed; and performing the channel-sensing related operation for a length of time corresponding to the indicator before a data transfer start time according to the data transfer indication, or, on the basis of the time at which the control signal is received, from after a length of time corresponding to the indicator, until before the data transfer start time according to the data transfer indication.