Wireless Node Contention Parameter Switching for LLRS Fairness
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Solution Overview
Problem
Current wireless communication networks face challenges in providing fair access to communication channels for both low latency reliable services (LLRS) and legacy traffic, as existing mechanisms like EDCA are insufficient to handle LLRS traffic effectively, leading to potential unfairness in channel access.
Innovation Solution
Implementing a method where nodes switch from a first contention parameter set to a second set after a dedicated service period for LLRS traffic, reducing the probability of accessing the channel, thereby ensuring fair access and prioritizing LLRS traffic while maintaining network efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stations with LLRS traffic are prioritized over legacy stations, then LLRS traffic delivery reliability is improved, but fairness in channel access deteriorates
Solution Approach 1:
The patent segments channel access into two distinct phases: a first phase where LLRS stations are prioritized with favorable contention parameters, and a second phase where legacy stations are given priority. This segmentation allows the system to alternate between favoring different station types, ensuring that LLRS traffic receives reliable delivery while legacy stations maintain fair access opportunities.
Solution Approach 2:
The patent implements periodic alternation between two contention parameter sets. Stations switch between a first contention parameter set (favoring LLRS) and a second contention parameter set (favoring legacy traffic) in periodic cycles. This periodic switching ensures that no single station type monopolizes channel access, maintaining fairness while ensuring LLRS delivery reliability.
2Speed
If dedicated service periods are allocated for LLRS traffic, then LLRS transmission priority is improved, but channel access complexity increases
Solution Approach 1:
The patent makes contention parameters dynamic by allowing stations to switch between different parameter sets based on their traffic type and the current phase of the periodic cycle. This dynamic adjustment enables the system to optimize for LLRS speed during dedicated periods while maintaining manageable complexity through standardized switching mechanisms.
Solution Approach 2:
The patent changes contention parameters (such as contention window sizes, inter-frame spaces, and backoff values) depending on the traffic category and time phase. By modifying these parameters periodically, the system can accelerate LLRS transmission during dedicated service periods without permanently complicating the overall channel access mechanism.
3Reliability
If contention parameters are adjusted to prioritize LLRS, then LLRS packet delivery ratio is improved, but legacy station access probability worsens
Solution Approach 1:
The patent applies counterbalancing by introducing a second contention parameter set that favors legacy stations, which offsets the advantage given to LLRS stations during the first phase. This counterweight mechanism ensures that while LLRS packet delivery ratio is improved during its priority phase, legacy stations are compensated with favorable parameters in the subsequent phase, maintaining overall access probability balance.
Data Source
AI summary
A communication method in a communication network comprising a plurality of nodes connected to at least one access point node, the nodes being able to transmit data on at least one communication channel using a contention access method according to a contention parameter set, the method comprising, at a node, transmitting a given type of traffic during a dedicated service period allocated by the access point node, and switching, at the end of the dedicated service period, from a first contention parameter set to a second contention parameter set for contention access to the communication channel after a successful transmission of the given type of traffic during the dedicated service period.