Relay Node Downlink Signal Retransmission Scheduling
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Solution Overview
Problem
In wireless communication systems, the existing methods for transmitting downlink signals at relay nodes with base stations face challenges in achieving high data rates due to the lack of a dedicated control channel between UE relays and end users, particularly in open-loop and transparent modes where channel status information is limited, leading to inefficiencies in spectral and energy usage.
Innovation Solution
A method involving iterative scheduling of UE relays based on overhearing negative and positive response signals, channel status information, and subframe decoding to re-transmit downlink signals efficiently, ensuring the best channel status relay re-transmits the signal to the end user, thereby improving spectral and energy efficiency without additional channel allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If relay nodes operate in open-loop and transparent mode without dedicated control channels, then device complexity is reduced and ease of operation is improved, but channel status information becomes limited and data rate decreases
Solution Approach 1:
The patent implements feedback mechanisms where relay nodes report channel status information to the base station, and the base station provides scheduling decisions. This feedback loop enables the system to adapt to channel conditions while maintaining open-loop operation, resolving the contradiction between operational simplicity and data rate performance
Solution Approach 2:
The patent dynamically changes scheduling parameters and resource allocation based on reported channel status information. By adjusting transmission parameters according to channel conditions, the system achieves higher data rates without requiring dedicated control channels, thus resolving the contradiction between ease of operation and productivity
2Productivity
If iterative scheduling of relays is implemented to improve data rate, then productivity is improved, but device complexity and measurement precision requirements increase
Solution Approach 1:
The patent implements iterative scheduling where the base station schedules relays based on available channel status information, performing partial scheduling actions in each iteration rather than requiring complete information. This approach achieves improved data rates through progressive refinement without overwhelming device complexity
Solution Approach 2:
The patent collects channel status information from relay nodes before performing scheduling decisions. This preliminary gathering of information enables more informed scheduling iterations, improving data rates while managing complexity by preparing data in advance rather than processing it in real-time during scheduling
3Measurement precision
If channel status information is collected from relays to improve scheduling accuracy, then measurement precision is improved, but use of energy and loss of information increase due to additional signaling
Solution Approach 1:
The patent designs the channel status information reporting mechanism to serve multiple functions: it provides measurement precision for scheduling decisions while also enabling relay selection, resource allocation, and quality of service management. This multi-functionality reduces the need for separate signaling channels, improving energy efficiency while maintaining measurement precision
Solution Approach 2:
The patent uses the base station as an intermediary that collects channel status information from relay nodes and processes it centrally. This intermediary approach consolidates signaling traffic, reducing redundant transmissions and energy consumption while maintaining accurate channel status measurements for scheduling decisions
Data Source
AI summary
A method for transmitting downlink signals at a source base station in a wireless communication system is disclosed. The method comprises transmitting a downlink signal to an end user and at least one relay; receiving a negative response signal from the end user; receiving a positive response signal and channel status information about a channel between the at least one relay and the end user, wherein the at least one relay overhears the negative response signal; and scheduling a specific relay having the best channel status of the at least one relay to re-transmitting the downlink signal to the end user.