Relay Node Timing Advance Adjustment for Simultaneous Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In next-generation wireless communication systems, relay nodes face challenges in simultaneously transmitting and receiving signals due to timing and propagation delays, leading to inefficiencies and potential inter-symbol interference, especially in integrated access and backhaul scenarios.
Innovation Solution
The method involves a relay node adjusting timing advance (TA) and propagation delay values through uplink and downlink grants and assignments, allowing simultaneous signal reception and transmission by synchronizing with parent and child nodes, prioritizing synchronization signals for accurate timing coordination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If relay nodes transmit and receive signals at the same time, then resource efficiency improves, but timing synchronization becomes difficult due to propagation delays
Solution Approach 1:
The patent applies dynamics by making the timing advance value adjustable and adaptive. The relay node dynamically modifies the TA value based on propagation delay conditions to enable simultaneous transmission and reception. This is evident in the embodiment where the relay node receives an uplink grant, determines a modified TA value considering the propagation delay to the parent node, and transmits uplink signals with this adjusted timing, allowing full-duplex operation while maintaining synchronization.
2Reliability
If timing advance values are adjusted for simultaneous transmission and reception, then reliability improves, but control channel resource burden increases
Solution Approach 1:
The patent applies parameter changes by modifying the timing advance value parameter to enable simultaneous transmission and reception. Instead of adding complex control signaling, the system adjusts the TA parameter dynamically. The relay node calculates a modified TA value that accounts for the propagation delay to the parent node, allowing it to transmit uplink signals at a timing that avoids collision with downlink receptions, thereby improving reliability without excessive control overhead.
3Device complexity
If relay nodes use fixed timing advance values, then device complexity is reduced, but inter-symbol interference occurs during simultaneous transmission and reception
Solution Approach 1:
The patent resolves this contradiction by implementing dynamic timing advance adjustment. The relay node determines a modified TA value based on the propagation delay to the parent node and the timing of downlink receptions. This dynamic adjustment ensures that uplink transmissions are timed to avoid overlapping with downlink receptions, eliminating self-interference and ISI. The process maintains manageable complexity by using straightforward timing calculations based on measured propagation delays.
Data Source
AI summary
The present invention relates to a wireless communication system, and specifically, provides a communication method and a device therefor, the communication method comprising: transmitting, to a terminal, an uplink grant comprising first information for changing a timing advance (TA) value; receiving, from the terminal, a first uplink signal which is based on the first information; and receiving a first downlink signal from a base station, wherein the transmission timing of the first uplink signal from the terminal is determined on the basis of the first information so that the first uplink signal and the first downlink signal may be received simultaneously at a relay node.