Wireless Communication System Slot Allocation Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing TDMA communication scheme faces inefficiencies in channel use due to unused slots when terminals do not have data to transmit, and existing methods to address this, such as contention-based access, do not effectively increase channel use efficiency, especially for emergency data transmission.
Innovation Solution
A wireless communication system that incorporates both allocation-based and contention-based access periods, where nodes perform carrier-sensing to determine available slots and prioritize emergency data transmission, allowing for flexible slot allocation and use within these periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If TDMA slot allocation scheduling is devised to prevent channel use efficiency from lowering, then channel use efficiency is improved, but scheduling processing complexity increases
Solution Approach 1:
The beacon interval is divided into two distinct access periods: a first access period using allocation-based access scheme and a second access period using contention-based access scheme. This segmentation allows different access methods to be applied to different time slots, resolving the contradiction by enabling efficient channel utilization through contention-based access while maintaining simple scheduling in allocation-based periods.
Solution Approach 2:
The system dynamically switches between allocation-based and contention-based access schemes across different periods. Nodes can flexibly transition from scheduled access to contention-based access based on data availability and priority requirements, optimizing channel usage without requiring complex real-time scheduling decisions.
2Productivity
If contention-based access scheme period is not considered in TDMA, then slot allocation remains simple, but channel use efficiency cannot be sufficiently increased
Solution Approach 1:
The patent merges two access schemes (allocation-based and contention-based) into a unified communication system. The first access period uses allocation-based schemes for scheduled communication, while the second access period uses contention-based schemes for flexible access, combining the advantages of both approaches to achieve high channel efficiency without excessive complexity.
3Speed
If emergency data transmission is required immediately, then transmission speed is improved, but channel collision probability increases
Solution Approach 1:
The system performs preliminary actions by designating specific periods (second access period with contention-based scheme) and procedures (carrier sensing before transmission) for emergency data. Nodes perform carrier sensing to check channel availability before transmitting emergency data, and the system prioritizes emergency frames in the contention-based access period, reducing collision probability while maintaining fast transmission.
Data Source
AI summary
A wireless device performs communication of a first access period and a second access period, the first access period including a plurality of slots in which communication is performed on a slot basis by allocating the slots and the second access period including a plurality of slots in which communication is performed in a contention-based access scheme on a slot basis, and includes a transmitter, a receiver and an control circuitry. The control circuitry performs, when one slot in the second access period is determined, carrier-sensing during a period of time depending on a type of the frame, and controls to transmit via the transmitter the frame at a timing defined depending on the type of the frame after the period of time.