SCW Reservation Protocol for WRAN Coexistence Beaconing
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Solution Overview
Problem
Current Time Division Multiple Access (TDMA) Coexistence Beaconing Protocol for Wireless Regional Area Networks (WRANs) is inefficient due to contention-based communication, leading to collisions and delayed data transfer when multiple WRAN cells operate on the same or different channels, especially as the number of cells increases.
Innovation Solution
A SCW reservation protocol that schedules unique transmission periods for each WRAN cell across multiple channels, eliminating contention by allocating specific SCWs for transmission and ensuring that cells know when to transmit and receive data, allowing for efficient and reliable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If contention-based communication is used in TDMA Coexistence Beaconing Protocol, then WRAN cells can operate on multiple channels, but collisions occur and data transfer is delayed as the number of cells increases
Solution Approach 1:
The patent implements a reservation mechanism where WRAN cells perform preliminary actions by reserving specific Time Slots (TS) and Sub-Channels (SC) before actual data transmission. The SCW Reservation Protocol allows cells to announce their reservation intentions in advance through reservation SCWs, enabling other cells to adjust their transmissions accordingly and avoid collisions. This preliminary reservation action transforms the contention-based system into a coordinated system where conflicts are prevented before they occur.
2Device complexity
If contention-based communication is used, then implementation is simpler, but latency increases due to random retransmission attempts
Solution Approach 1:
The reservation mechanism performs preliminary scheduling actions where cells announce their transmission plans in advance through reservation SCWs. This allows the system to establish a coordinated transmission schedule before actual data transfer, eliminating the need for random retransmission attempts and significantly reducing latency while maintaining manageable protocol complexity through structured reservation frames.
Solution Approach 2:
The SCW Reservation Protocol incorporates feedback mechanisms where WRAN cells monitor reservation announcements from other cells and adjust their own reservation decisions accordingly. This feedback loop enables dynamic coordination without centralized control, allowing cells to learn about channel occupancy and make informed reservation decisions that avoid conflicts and minimize latency.
3Adaptability or versatility
If multiple WRAN cells operate on the same channel with synchronized SCWs, then inter-cell communication is enabled, but collisions occur when multiple cells transmit simultaneously
Solution Approach 1:
The patent segments the communication resource into discrete Time Slots (TS) and Sub-Channels (SC), creating a two-dimensional resource grid. The SCW Reservation Protocol operates on this segmented structure, allowing cells to reserve specific TS-SC combinations. This segmentation enables multiple cells to communicate simultaneously on different segments without collision, transforming the shared medium into a multiplexed resource allocation system that maintains inter-cell communication while eliminating conflicts.
Data Source
AI summary
A self-coexistence window reservation protocol for a plurality of Wireless Regional Area Network (WRAN) cells operating in a WRAN over a plurality of channels includes a sequence of self-coexistence windows that uniquely identifies a transmission period for each WRAN cell. A self-coexistence window reservation protocol is included within the first packet of a Coexistence Beaconing Protocol period identifying when each WRAN cell associated with a particular channel will transmit. When not actively transmitting, a WRAN cells remains in a passive, receiving mode to accept data. As the transmissions of each WRAN cell operating on a particular channel are scheduled, contention for a transmission period is eliminated.