Relay Timing Advance Signaling for Uplink Synchronization
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Solution Overview
Problem
Current wireless communication systems face challenges in achieving time synchronization between user equipment (UE) sources and relays in uplink communications, particularly due to the assumption of pre-existing synchronization and channel estimation, which can lead to inefficiencies in data signal alignment at the destination node.
Innovation Solution
Determining and signaling timing advance parameters from the destination node to both the source node and relay nodes, ensuring that data signals from the source and relay arrive simultaneously at the destination, thereby enabling joint decoding and improving coverage and capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If timing advance parameters are determined and signaled from the destination node to both source node and relay nodes, then data signals from source and relay arrive simultaneously at the destination, but the system complexity increases due to additional timing parameter management and signaling
Solution Approach 1:
The destination node determines and signals timing advance parameters to both the source node and relay nodes before actual data transmission occurs. This preliminary timing configuration ensures that when data signals are transmitted, they will arrive simultaneously at the destination, achieving synchronization without requiring complex real-time adjustments during transmission.
2Ease of operation
If pre-existing synchronization and channel estimation are assumed, then the system operation is simplified, but data signal alignment at the destination node becomes inefficient
Solution Approach 1:
The system changes the timing advance parameters dynamically based on the specific transmission scenario involving relays. By adjusting these parameters according to the actual signal paths and propagation delays, the system achieves both ease of operation through standardized parameter management and high productivity through optimized signal alignment at the destination node.
Data Source
AI summary
In one exemplary embodiment, an apparatus (50) includes: means for determining (52) a source timing parameter for a source node (70) and a relay timing parameter for a relay node (60), wherein the relay node (60) is disposed between the source node (70) and the apparatus (50); first means for transmitting (56) the relay timing parameter to the relay node (60); and second means for transmitting (56) the source timing parameter and the relay timing parameter to the source node (70). In another exemplary embodiment, an apparatus (70) includes: first means for receiving (76) a first timing parameter; second means for receiving (76) a second timing parameter; first means for transmitting (76) a message to a first node (60) in accordance with the first timing parameter; and second means for transmitting (76) the message to a second node (50) in accordance with the first and second timing parameters.