Relay Downlink Power Control via eNodeB Parameter Configuration
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Solution Overview
Problem
The existing LTE system does not consider the influence of relay nodes in downlink power control, leading to challenges in controlling and optimizing transmission power in relay-based scenarios, which affects transmission performance.
Innovation Solution
A method and system where the evolved NodeB determines and informs power parameters, including P_A and P_B, to terminals based on downlink transmission power from the relay, allowing the relay to adjust its transmission power to enhance signal demodulation and transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay nodes are introduced to extend coverage and improve signal transmission, then transmission coverage and signal quality are improved, but downlink power control becomes complex and difficult to optimize
Solution Approach 1:
The evolved NodeB acts as an intermediary that centrally determines power parameters (P_A and P_B) for both direct and relay transmissions. This mediator approach simplifies the overall power control by centralizing the decision-making process at the eNodeB, which has global system knowledge, rather than requiring complex distributed negotiations between relay nodes and terminals.
Solution Approach 2:
The invention introduces specific power parameters (P_A for data sub-carrier to pilot power ratio, and P_B for pilot power ratios in different OFDM symbols) that can be independently adjusted. By changing these parameters, the system can optimize transmission power for relay scenarios without overhauling the entire power control framework, thus improving reliability while managing complexity through targeted parameter adjustments.
2Productivity
If existing LTE power control methods are used without modification, then system simplicity is maintained, but transmission performance in relay scenarios deteriorates
Solution Approach 1:
The power parameters P_A and P_B are dynamically determined by the eNodeB based on current transmission conditions, terminal capabilities, and relay characteristics. This dynamic adjustment allows the system to adapt to varying relay scenarios (different relay nodes, different terminal positions, different channel conditions) while maintaining good transmission performance, thus improving both productivity and adaptability.
Solution Approach 2:
The power control is segmented into distinct parameters (P_A for data-to-pilot ratio, P_B for pilot power ratios) that can be independently optimized for relay scenarios. This segmentation allows targeted adjustments specific to relay transmissions without affecting other system aspects, improving adaptability to relay scenarios while maintaining overall system efficiency.
Data Source
Figure 1~2
AI summary
The present invention discloses a system and method for transmitting downlink data via a relay, and a relay. The system comprises an evolved NodeB and a relay, wherein the evolved NodeB is configured to determine power parameters of a terminal based on downlink transmission power from the relay to the terminal, and to inform the terminal of the power parameters; and the relay is configured to transmit a signal to the terminal based on the downlink transmission power; and the signal received from the evolved NodeB and/or the relay is demodulated by the terminal based on the power parameters. The present invention enhances the transmission performance of the system, and solves the problem of setting the transmission power of the relay node.