Wireless Communication Device Adjacent Channel Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems using the 2.4 GHz frequency band, the overlap between channels leads to collisions and degraded channel utilization due to the inability to demodulate packets on adjacent channels, resulting in higher packet error rates despite existing protection modes like RTS/CTS.
Innovation Solution
A wireless communication device and method that transmits protection packets on adjacent channels with overlapping frequency bands to prevent data packet collisions by generating and transmitting protection packets before data packets, ensuring users on adjacent channels stop using their channels during data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If protection packets are transmitted on the same channel as data packets, then channel utilization is improved, but packet collisions occur with adjacent channels due to frequency band overlap
Solution Approach 1:
The patent extends the protection mechanism from a single channel dimension to multiple channel dimensions by transmitting protection packets on adjacent channels simultaneously. This dimensional expansion allows the system to protect against collisions not just on the current channel but also on overlapping adjacent channels, resolving the contradiction between channel utilization and collision avoidance.
Solution Approach 2:
The patent transmits protection packets before data packets on adjacent channels to preemptively reserve those channels. This preliminary action ensures that when data packets are transmitted on the current channel, adjacent channels are already marked as occupied, preventing collisions even though frequency bands overlap.
2Speed
If channel bandwidth is increased to 40 MHz, then data transmission rate is improved, but overlap with adjacent channels increases causing more collisions
Solution Approach 1:
The patent applies preliminary anti-action by transmitting protection packets on adjacent channels before data transmission begins. These protection packets carry NAV (Network Allocation Vector) information that tells adjacent channel users to remain silent during the upcoming data transmission, thereby preemptively counteracting the potential interference that would result from wide channel bandwidth overlap.
Data Source
AI summary
A wireless communication device for a transmission end of a wireless communication system is provided. The wireless communication device includes a wireless analog transmission unit, for transmitting a data packet on a data transmission channel; and a packet generating unit, for generating the data packet and at least one protection packet; wherein before transmitting the data packet on the data transmission channel, the wireless communication device transmits the at least one protection packet on at least one adjacent channel of the data transmission channel to indicate to at least one user of the at least one adjacent channel to stop using the at least one adjacent channel before transmission of the data packet is completed, and at least one frequency band of the at least one adjacent channel overlaps a frequency band of the data transmission channel.