Relay Frame Network Coding Bandwidth Optimization
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Solution Overview
Problem
In wireless communication networks, the link load of relay stations is significantly greater than that of base stations, leading to reduced performance due to inefficient data transmission methods.
Innovation Solution
Implementing a method where relay stations receive data from parent stations during downlink periods, perform network coding by logically XOR-ing data with data from child stations, and transmit the coded data back to both the child and parent stations, thereby optimizing resource usage and reducing bandwidth consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay stations transmit data separately to parent and child stations using dedicated resources, then data transmission reliability is improved, but bandwidth consumption increases and network performance deteriorates
Solution Approach 1:
The patent combines separate transmissions to parent and child stations into a single network-coded transmission. The relay station encodes received data from the parent station and transmits the coded data to the child station during the uplink period, allowing both stations to obtain needed information from one transmission event, thereby reducing bandwidth consumption while maintaining reliability
Solution Approach 2:
The uplink transmission resource is made multi-functional by enabling the relay station to transmit network-coded data that serves both the parent station (for acknowledgment and further processing) and the child station (for receiving the actual data), thus one resource performs multiple transmission functions simultaneously
2Reliability
If relay stations use separate resources for uplink and downlink transmissions, then transmission reliability is improved, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent merges the functionality of separate uplink and downlink transmissions into a unified network coding operation where a single transmitted signal serves multiple purposes for multiple stations, improving resource utilization efficiency while preserving transmission reliability through the coding mechanism
Solution Approach 2:
The network coding operation enables continuous useful action by allowing the relay station to continuously encode and forward data during uplink periods, maximizing the utilization of available transmission resources without idle periods that would occur with separate dedicated transmission schemes
3Loss of energy
If relay stations perform network coding by XOR-ing data, then bandwidth consumption is reduced, but transmission complexity increases
Solution Approach 1:
The patent applies parameter changes by transforming the data representation through XOR encoding, changing the form of the data while maintaining its information content. This simple mathematical operation reduces bandwidth requirements while the complexity increase is minimal and confined to basic encoding/decoding operations at the relay and receiving stations
Data Source
AI summary
A method for transmitting data includes receiving at a first relay station first data from a parent station during a downlink period comprising a plurality of downlink zones. A network coding zone is one of the plurality of downlink zones and is located at an end of the downlink period, and the first data is received in at least one of the plurality of downlink zones other than the network coding zone. The method further includes receiving at the first relay station from a child station, second data during an uplink zone, and transmitting third data by the first relay station to the child station, during the network coding zone using a resource. The method further includes transmitting the third data to the parent station, during the network coding zone, using the resource. The third data results from the first data being effectively logically XOR-ed to the second data.