Wireless Interframe Space Utilization for Latency Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in achieving high spectral efficiency and capacity due to channel contention delays, which can lead to latency issues in congested channels, especially in IEEE 802.11 networks where devices refrain from channel access during transmission opportunities (TXOPs), limiting the ability to meet strict latency requirements.
Innovation Solution
The proposed solution involves detecting transmissions from other wireless networks, negotiating the use of interframe spaces (IFS) within TXOPs for data frame transmission, and utilizing these spaces for expedited channel access by synchronizing symbol and frequency with the existing transmissions, allowing for reduced header frames and embedded identifiers for correct decoding, thereby optimizing channel utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If devices refrain from channel access during transmission opportunities (TXOPs) in IEEE 802.11 networks, then transmission conflicts are reduced, but channel utilization is limited and latency requirements cannot be met
Solution Approach 1:
The patent segments the TXOP structure by identifying and utilizing interframe spaces (IFS) between frames transmitted by the first device. These IFS periods are normally idle intervals that are segmented out and repurposed for additional transmissions from the second device, thereby increasing channel utilization without causing transmission conflicts during the main TXOP.
2Ease of operation
If channel contention protocols are used in congested channels, then fair channel access is maintained, but transmission latency increases
Solution Approach 1:
The patent establishes a preliminary agreement between the first and second devices regarding the use of interframe spaces for data transmission. This preliminary coordination allows the second device to transmit during IFS periods without requiring real-time channel contention, thereby reducing transmission latency while maintaining fair channel access through pre-negotiated rights.
3Reliability
If traditional frame structures with headers and preambles are used, then transmission reliability is ensured, but transmission time and spectral efficiency are reduced
Solution Approach 1:
The patent extracts and removes the traditional frame headers and preambles from the data frames transmitted during interframe spaces. Since the receiving device already has synchronization information from the main TXOP frames, the redundant header information is eliminated, resulting in shorter transmission time and improved spectral efficiency while maintaining sufficient reliability through the embedded FCS.
Data Source
AI summary
This document discloses a solution for detecting a transmission opportunity. According to an aspect, a method comprises as performed by an apparatus of a first wireless network: detecting a first transmission from a first apparatus of a second wireless network different from the first wireless network; transmitting, to a second apparatus of the first wireless network, a transmission mode request, wherein the transmission mode request indicates a request to transmit from the apparatus to the second apparatus at least during an interframe space of a transmission opportunity between the first apparatus and another apparatus of the second wireless network, receiving a transmission mode response from the second apparatus, wherein the transmission mode response indicates acceptance of the request; in response to detecting a second transmission from the first apparatus, transmitting a data frame during an interframe space following the second transmission.