Channel Switch Mechanism for Wireless Terminals
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Solution Overview
Problem
Existing channel switch mechanisms in wireless communication systems, particularly in unlicensed frequency bands and TVWS, face high probabilities of switch failure due to frequent channel changes, as they rely on beacon frames that are not suitable for rapid switching scenarios.
Innovation Solution
A method and apparatus for channel switch that involve sending a channel switch announcement instruction with a target channel position and time, followed by information exchange on both the original and target channels within a preset soft switch time interval, and then stopping transmission on the original channel after this interval ends, allowing for a smooth transition and reducing switch failure probabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beacon frames are transmitted multiple times to reduce switch failure probability, then reliability improves, but the long transmission period makes it unsuitable for frequent channel switching scenarios
Solution Approach 1:
The patent segments the channel switching announcement process into multiple independent transmission opportunities. Instead of relying on a single long beacon frame transmission, the system transmits the channel switch announcement at multiple time points (t-T1, t-T2, ..., t-Tn) before the actual switch time. This segmentation allows users to receive the announcement through at least one successful transmission, reducing switch failure probability while enabling frequent channel switching.
2Adaptability or versatility
If channel switching is performed frequently to adapt to changing channel conditions, then system adaptability improves, but the probability of switch failure increases due to insufficient notification time
Solution Approach 1:
The patent applies preliminary action by transmitting the channel switch announcement well in advance of the actual channel switch. The system sends the announcement at multiple predetermined time points (t-T1, t-T2, ..., t-Tn) before the switch time t, giving users sufficient time to process and prepare for the switch. This preliminary notification approach enables frequent channel switching while maintaining high reliability by ensuring users receive the announcement before each switch.
3Device complexity
If information is transmitted only on the target channel after switch announcement, then device complexity reduces, but information loss occurs during the transition period when users may not have fully switched channels
Solution Approach 1:
The patent uses the original channel as an intermediary for information transmission during the transition period. After sending the channel switch announcement, the system continues to transmit information on both the original channel and the target channel within a preset time interval. This dual-channel transmission approach ensures that users who have not yet fully switched channels can still receive information on the original channel, while users who have switched can receive information on the target channel, thereby preventing information loss without significantly increasing system complexity.
Data Source
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AI summary
The present invention discloses a method, an apparatus and a wireless terminal for channel switch, and the method includes: sending information on the target channel and a first channel within the preset channel soft switch time interval after a channel switch announcement instruction is sent on the first channel when the first channel needs to be switched, and stopping sending information on the first channel if the preset channel soft switch time interval ends. By means of above method, the probability of switch failure for the user may be reduced in a scenario with frequent channel switch.