Relay Frame Structure Timing Alignment for Wireless Backhaul
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Solution Overview
Problem
Current wireless communication systems lack a detailed procedure and channel configuration method for data transmission and reception between a relay and a base station, particularly in terms of timing and frame structure, which hinders efficient data exchange and network performance.
Innovation Solution
A method for downlink and uplink transmission in a mobile communication network involving a relay, where the base station transmits backhaul signals considering the relay's switching time between transmission and reception, and the relay adjusts its subframes accordingly, using specific frame structures and timing configurations to optimize data exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a relay is deployed to extend cell coverage and improve throughput, then network performance is improved, but the complexity of data transmission procedures and channel configuration increases due to additional wireless links and timing requirements
Solution Approach 1:
The patent segments the transmission procedure into distinct phases: backhaul downlink transmission from base station to relay, switching period for the relay, and access downlink transmission from relay to UE. This segmentation allows each phase to be configured and optimized independently, managing the complexity introduced by the relay while maintaining improved network performance.
Solution Approach 2:
The patent applies preliminary action by determining the backhaul downlink transmission timing at the base station in advance, considering the relay's switching time requirements. The base station configures the timing of backhaul downlink signals before actual transmission, ensuring the relay can properly switch between receiving from the base station and transmitting to UEs, thereby managing complexity through proactive timing configuration.
2Reliability
If the base station transmits backhaul downlink signals considering the relay's switching time, then data transmission effectiveness is improved, but the timing configuration complexity increases
Solution Approach 1:
The patent changes the timing parameters of backhaul downlink signals based on the relay's switching characteristics. The base station adjusts the timing of backhaul downlink transmissions to account for the relay's switching time between receiving from the base station and transmitting to UEs. This parameter adjustment ensures reliable data transmission while the complexity is managed through standardized timing relationships.
Solution Approach 2:
The patent implements feedback mechanisms where the relay informs the base station about its switching time requirements, and the base station uses this information to configure appropriate backhaul downlink timing. This feedback loop ensures transmission effectiveness while managing complexity through information exchange and coordinated configuration.
3Area of stationary object
If additional wireless links are introduced for relay operation, then coverage extension and throughput improvement are achieved, but the number of transmission channels and configuration parameters increases
Solution Approach 1:
The patent applies universality by using the same frame structure for both backhaul downlink transmission (base station to relay) and access downlink transmission (relay to UE). The frame structure includes common elements such as resource blocks, reference signals, and timing relationships that can be configured once and applied to multiple transmission links, reducing the overall configuration complexity despite the additional wireless links.
Data Source
AI summary
Provided are an uplink transmission method and downlink transmission method in a mobile communication network including a relay. In the uplink and downlink transmission methods, frame structures and transmission timings of a backhaul downlink and a backhaul uplink are determined in consideration of at least one of a time for the relay to switch between transmission and reception and a signal transmission time. Accordingly, in a wireless communication system including a relay, it is possible to effectively perform data transmission and reception between the relay and a base station.