WLAN Data Handling via Piggybacked Acknowledgement Frames
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Solution Overview
Problem
Current WLAN protocols, such as IEEE 802.11, suffer from inefficiencies in data transmission due to random back-off timers and the inability to utilize the medium during acknowledgement periods, leading to reduced transmission capacity and shorter frame bursts caused by the need for separate data and acknowledgement transmissions in bi-directional data sessions.
Innovation Solution
The method involves generating and transmitting combined data/acknowledgement packets that piggyback additional data onto acknowledgement frames, allowing continuous medium control and increased data throughput by eliminating the need for separate contention periods after each data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate data and acknowledgement transmissions are used in bi-directional data sessions, then reliability of data receipt is ensured, but transmission capacity is reduced and frame bursts are shortened
Solution Approach 1:
The patent combines data transmission and acknowledgement functions into a single frame structure. The ACK frame is modified to carry both the acknowledgement signal and additional data payload, allowing bidirectional data exchange during what would traditionally be a unidirectional acknowledgement period. This merging eliminates the need for separate contention periods after each data transmission, thereby increasing transmission capacity while maintaining reliability.
2Reliability
If random back-off timers are used to prevent collisions, then collision reduction is achieved, but transmission delays increase significantly
Solution Approach 1:
The patent enables continuous medium control by allowing a station to transmit multiple data frames in succession without releasing the medium for contention after each frame. By piggybacking data onto ACK frames and eliminating repeated contention periods, the useful transmission action continues uninterrupted, significantly reducing the time loss associated with random back-off timers while maintaining collision prevention through the underlying CSMA/CA mechanism.
3Reliability
If the medium is reserved for acknowledgement transmission after data receipt, then reliable acknowledgement is ensured, but medium utilization efficiency is reduced
Solution Approach 1:
The patent makes the acknowledgement frame multi-functional by enabling it to serve both as an acknowledgement signal and as a data carrier. The ACK frame structure is extended to include a data payload field, allowing the same transmission medium and time slot to be used for both reliability functions (acknowledgement) and productivity functions (data transmission), thereby eliminating the trade-off between these two objectives.
Data Source
AI summary
A method of handling data in a wireless LAN comprises contending for control of the medium using a CSMA/CA mechanism or the like. Once control has been established data is sent from the node which has established that control, to a second node. The acknowledgement of receipt issued by that second node in consequence is combined with a payload at that second node and which is intended to be sent to the first node anyway, and a single frame, with the payload piggybacked onto the acknowledgement is returned to the first node. Bidirectional transmission of combined data and acknowledgement continues in a frame bursting manner until a time limit is reached or all data has been transmitted, whereafter contention commences again.