Staggered Time Slots for High-Density Wireless Channel Access
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Solution Overview
Problem
Existing wireless communication systems face unpredictability and high collision probability in channel access, especially in scenarios with coordinated APs, leading to poor channel usage and increased latency.
Innovation Solution
Implementing a method where wireless communication devices determine a set of non-adjacent time slots for accessing a shared wireless channel, ensuring staggered access attempts to avoid collisions and minimize delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If distributed coordination function (DCF) is used for channel access, then channel access is simple and decentralized, but collision probability increases and channel usage becomes poor when channel load is high
Solution Approach 1:
The patent segments the channel access process into two distinct phases: a contention phase where multiple APs randomly select time slots for access attempts, and a transmission phase where selected APs transmit in scheduled time slots. This segmentation resolves the contradiction by maintaining simple decentralized access during contention while ensuring reliable collision-free transmission during the scheduled phase.
Solution Approach 2:
The patent applies preliminary action by having APs perform random selection of time slots before actual transmission occurs. APs randomly choose from multiple time slots in advance, which prevents simultaneous access attempts and collisions before the transmission phase begins, thereby improving reliability while maintaining operational simplicity.
2Reliability
If centralized channel access controlled by AP is used, then channel access predictability improves, but device complexity increases
Solution Approach 1:
The patent implements self-service by enabling each AP to autonomously perform random time slot selection and manage its own transmission scheduling without requiring centralized coordination. Each AP independently chooses a time slot and transmits accordingly, achieving predictable access patterns while maintaining low device complexity through autonomous operation.
3Productivity
If multiple APs contend for channel access simultaneously, then channel utilization increases, but collision probability and latency increase
Solution Approach 1:
The patent applies periodic action by establishing a repeating cycle of contention and transmission phases. In each cycle, multiple APs randomly select time slots during the contention phase, then transmit in scheduled time slots during the transmission phase. This periodic structure enables continuous channel utilization while preventing collisions through systematic time slot assignment, thereby reducing latency.
Solution Approach 2:
The patent ensures continuity of useful action by maintaining an ongoing process where APs continuously perform random selection and transmission in alternating phases. The system never idle-waits; instead, it continuously cycles through contention and transmission, maximizing channel utilization while managing latency through structured time slot management.
4Reliability
If coordinated operation of APs is implemented, then channel access becomes more predictable, but coordination overhead and complexity increase
Solution Approach 1:
The patent achieves predictable channel access through self-service mechanisms where each AP independently performs random time slot selection without requiring coordination with other APs. The predictability arises from the systematic random selection process rather than inter-AP coordination, thereby maintaining low complexity while achieving reliable access patterns.
Data Source
AI summary
A wireless communication device determines a set of non-adjacent time slots. In at least one of the time slots from the set, the wireless communication device attempts to access a wireless channel shared with one or more other wireless communication devices.