Clear-to-send Message Delay Indicator for Wireless Flow Control
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Solution Overview
Problem
Existing wireless communication systems lack efficient flow control mechanisms, particularly in managing transmissions after a request-to-send message, leading to inefficiencies when the intended receiver is unavailable, resulting in retransmissions and contention for the medium.
Innovation Solution
The system employs a clear-to-send message that indicates whether to set a Network Allocation Vector (NAV) and includes a delay indicator, allowing the transmitter to schedule data transmission at a later time without retransmitting a request-to-send message, thereby improving flow control and reducing contention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiver is unavailable when a request-to-send message is received, then the transmitter must retransmit the request-to-send message, but this leads to increased medium contention and reduced communication efficiency
Solution Approach 1:
The clear-to-send message includes a delay indicator that specifies when the transmitter should send data, allowing the system to pre-schedule the transmission timing. This preliminary action prevents the need for retransmitting request-to-send messages by establishing the transmission schedule in advance, thereby improving both reliability and efficiency
Solution Approach 2:
The delay indicator acts as an intermediary mechanism between the receiver and transmitter, conveying timing information without requiring additional request-to-send messages. This intermediary allows the receiver to control the transmission schedule unilaterally, reducing medium contention while maintaining reliable flow control
2Reliability
If the transmitter retransmits the request-to-send message when the receiver is unavailable, then the transmission can eventually occur, but this increases contention for the medium
Solution Approach 1:
The clear-to-send message with delay indicator pre-establishes when transmission should occur, eliminating the need for repeated request-to-send messages. This preliminary scheduling action ensures transmission delivery while avoiding the harmful effect of increased medium contention that would result from retransmissions
Solution Approach 2:
The delay indicator extracts the timing control function from the request-to-send message sequence, allowing the receiver to unilaterally schedule transmissions without requiring the transmitter to retransmit requests. This extraction removes the source of medium contention while preserving reliable transmission delivery
Data Source
AI summary
Systems, methods, and devices for a delay indication in a wireless message are described herein. In one aspect an apparatus for wireless communication is provided. The apparatus includes a receiver configured to receive a first message from a second apparatus. In some aspects, the first message is a request-to-send (RTS) message. The access point further including a processing system, configured to generate a second message in response to reception of the first message. The second message comprising a delay indicator, the delay indicator indicating a delay after which a third message may be transmitted by the second apparatus, and a transmitter configured to transmit the second message to the second apparatus.