Multi-Hop Wireless Transmission Delay Control
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Solution Overview
Problem
In wireless communication networks, particularly in multi-hop transmissions, determining the overall transmission delay is challenging due to interference amplification, which can lead to obsolete information being relayed, and existing methods struggle to ensure that data reaches its destination within a predetermined maximum delay constraint.
Innovation Solution
A method that estimates the overall transmission delay by calculating the signal-to-interference-plus-noise ratio (SINR) at each relay node and adjusts the multi-hop transmission configuration to prevent excessive delays, including modifying retransmission rules and selecting optimal routes to ensure data reaches its destination within a specified time frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If relay nodes amplify and retransmit radio signals in multi-hop transmission, then the radio signal can reach distant destination nodes, but the interference is also amplified and the overall transmission delay becomes difficult to determine and may exceed maximum delay constraints
Solution Approach 1:
The patent applies preliminary action by estimating the overall transmission delay before the actual data transmission occurs. The base station calculates the cumulative delay through all relay nodes based on their individual delay characteristics, and only then decides whether to allow the transmission. This prevents obsolete data from being transmitted and ensures delay constraints are met beforehand.
Solution Approach 2:
The patent implements feedback by having relay nodes report their individual transmission delays to the base station. The base station uses this feedback information to calculate the overall transmission delay and make informed decisions about whether to permit transmission, thus controlling the delay parameter through closed-loop management.
2Strength
If relay nodes amplify the total strength of received signals, then the signal strength is maintained across hops, but interference is undifferentiatedly amplified along with the useful signal
Solution Approach 1:
The patent applies segmentation by dividing the signal processing function at relay nodes. Instead of amplifying the total signal strength (which includes interference), each relay node separately measures and reports only its received signal strength and individual delay to the base station. The base station then calculates the overall delay and controls transmission accordingly, effectively segmenting the useful signal measurement from the interference.
Solution Approach 2:
The base station acts as an intermediary that centralizes the decision-making process. It collects delay information from all relay nodes, calculates the overall transmission delay, and makes the final decision about whether to permit transmission. This intermediary approach prevents local amplification of interference while maintaining signal strength through coordinated control.
Data Source
AI summary
A method of controlling a multi-hop transmission in a wireless communication network implementing plural relay nodes. The method includes: obtaining for a current relay node, a current strength ratio between a strength of the radio signal and a noise and interference strength, received and measured by the current relay node; determining a current intermediate transmission delay of a data volume transmitted by a source node, which is a function of the current strength ratio, a received data volume and a transmission bandwidth; estimating an overall transmission delay of the data volume from the source node to a final relay node at a number of hops N, with N being greater than or equal to i, based on the current intermediate transmission delay and a previously determined intermediate delay; and, if the estimated overall transmission delay reaches or exceeds a maximum delay, modifying a multi-hop transmission configuration of the system.