Multi-Link Random Backoff for 20 MHz Channel Extension
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Solution Overview
Problem
The existing broadband wireless communication networks face challenges in efficiently utilizing a 10 MHz channel, particularly in achieving higher data throughput and extending transmission distance while maintaining fairness with adjacent channels.
Innovation Solution
The proposed solution involves performing a multi-random backoff operation based on the access class of enhanced distributed channel access (EDCA), which extends a 10 MHz channel to a 20 MHz channel. This is achieved by configuring a multi-link association and performing random backoff operations on each link, allowing for simultaneous transmission of frames through multiple links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a 10 MHz channel is used for transmission, then transmission distance and coverage are maintained, but data throughput is limited
Solution Approach 1:
The patent divides the transmission channel into multiple 10 MHz sub-channels (first link and second link) that can be independently accessed through separate random backoff operations. This segmentation allows the system to aggregate multiple 10 MHz channels to achieve 20 MHz throughput while maintaining the simplicity of 10 MHz channel operations, thereby resolving the contradiction between limited throughput and operational complexity.
2Productivity
If multiple random backoff operations are performed on multiple links, then channel utilization and throughput are improved, but access delay and complexity increase
Solution Approach 1:
The patent performs preliminary monitoring of multiple links during the AIFS period before the random backoff operation. By determining in advance whether adjacent 10 MHz channels are available and can be extended to 20 MHz, the system prepares the channel access strategy beforehand. This preliminary action reduces the actual access delay during the random backoff phase while maintaining improved channel utilization.
3Productivity
If a 20 MHz channel is used for transmission, then data throughput is increased, but fairness with adjacent 10 MHz channels deteriorates
Solution Approach 1:
The patent implements dynamic channel extension where the system adaptively decides whether to use a single 10 MHz channel or extend to 20 MHz by combining multiple 10 MHz channels. This dynamic approach allows the system to flexibly adjust channel width based on availability, ensuring fair access to adjacent 10 MHz channels while achieving 20 MHz throughput when conditions permit, thus resolving the contradiction between throughput and fairness.
Data Source
AI summary
An operating method of a communication node in a wireless communication network includes: performing a first monitoring operation on a first link and a second link during a preset period; performing a first random backoff operation in the first link for a first random backoff period, if the first link and the second link are in an idle state according to the first monitoring operation; performing, in the second link, a second random backoff operation for a second random backoff period which is different from the first random backoff period in length; and transmitting a frame at a same point in time in the first link and the second link, if the first link is in the idle state according to the first random backoff operation, and if the state of the second link is an idle state according to execution of the second random backoff operation.