Relay Node Timing Synchronization in Wireless Systems
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Solution Overview
Problem
In wireless communication systems, the mismatch between symbol or slot boundaries of signals due to different propagation delays in backhaul and access links leads to increased interference when relay nodes simultaneously transmit or receive signals.
Innovation Solution
A method for determining and adjusting transmission and reception timing between nodes using configuration information and timing advance (TA), with the ability to synchronize signals through Frequency Division Multiplexing (FDM), Spatial Division Multiplexing (SDM), or Time Division Multiplexing (TDM), and inserting transmission gaps to match symbol boundaries between the backhaul and access links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If relay nodes simultaneously transmit and receive signals through backhaul and access links, then communication efficiency is improved, but interference increases due to mismatch between symbol or slot boundaries caused by different propagation delays
Solution Approach 1:
The patent applies preliminary action by calculating and applying timing advance (TA) values before transmission occurs. The network node determines propagation delay and configures TA values for relay nodes in advance, allowing them to pre-adjust their transmission timing. This preliminary timing adjustment ensures that simultaneous transmission and reception operations are performed at correctly aligned times, preventing boundary mismatches and interference while maintaining communication efficiency.
2Object-generated harmful factors
If transmission timing is adjusted to synchronize symbol boundaries between backhaul and access links, then interference is reduced, but system complexity increases due to need for timing offset configuration and management
Solution Approach 1:
The patent implements feedback by having relay nodes report their timing adjustment status and reception timing information back to the network node. The network node uses this feedback to calculate appropriate timing offsets and TA values, then configures them to relay nodes. This closed-loop feedback mechanism enables automatic timing synchronization that reduces interference while managing system complexity through centralized control based on reported node status.
Solution Approach 2:
The patent applies self-service by enabling relay nodes to autonomously calculate their reception timing based on configured parameters and automatically adjust their transmission timing using the calculated TA values. Rather than requiring continuous centralized timing control, relay nodes independently perform timing adjustments based on pre-configured information and their own measured propagation delays, reducing the overall system complexity while maintaining synchronization.
Data Source
AI summary
The present specification provides a method for transmitting and receiving data by a relay node in a wireless communication system and an apparatus therefor. The relay node receives configuration information from a network node, wherein the configuration information may include a timing offset for transmitting downlink data. The relay node transmits the downlink data to a second relay node on the basis of the configuration information, in which transmission timing of the downlink data may be determined on the basis of the timing offset and a timing advance (TA).