HARQ Protocol Mapping for Relay Node Round Trip Time
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Solution Overview
Problem
The increased average round trip time in mobile communication systems due to limitations in available time intervals for data transmission between nodes, particularly in relay nodes, leads to performance degradation and increased control signaling overhead.
Innovation Solution
A retransmission protocol that selects and maps transmission processes onto available time intervals in a predefined order and cyclically, ensuring low control signaling overhead and flexible timing patterns, thereby controlling the round trip time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmission processes are mapped onto available time intervals in relay nodes, then data transmission efficiency is improved, but round trip time increases due to limited available time intervals
Solution Approach 1:
The patent segments the data transmission process into multiple independent transmission processes (HARQ processes). Each process can be independently mapped to available time intervals, allowing parallel transmission opportunities. This segmentation enables the system to utilize scattered available time intervals more effectively, improving data transmission efficiency without requiring a single continuous time slot, thereby reducing the impact of limited available intervals on round trip time.
Solution Approach 2:
The patent implements dynamic mapping of transmission processes to available time intervals. Instead of fixed timing, the system dynamically selects and maps transmission processes based on the actual availability of time intervals in relay nodes. This dynamic approach allows the system to adapt to varying network conditions and available resources, optimizing data transmission efficiency while managing round trip time through flexible process selection and mapping.
2Productivity
If more transmission processes are used to reduce round trip time, then data transmission efficiency improves, but control signaling overhead increases
Solution Approach 1:
The patent applies local quality by using different numbers of transmission processes for different time intervals or different data flows. Instead of uniformly using a fixed number of processes across all transmissions, the system can locally adapt the number of processes based on specific conditions such as channel quality, available time intervals, or traffic requirements. This allows optimization of data transmission efficiency in specific contexts while minimizing control signaling overhead in others.
Solution Approach 2:
The patent enables dynamic adjustment of the number of transmission processes as a configurable parameter. The system can change the number of processes based on network conditions, available resources, and performance requirements. This parameter change capability allows the system to balance between data transmission efficiency and control signaling overhead by selecting an appropriate number of processes for different operational scenarios.
Data Source
AI summary
The present invention relates to a method for configuring a retransmission protocol on the uplink between a network node and a relay node in a mobile communication system, the configuration being performed at a network node or at a relay node, and to the corresponding relay node apparatus and network node apparatus capable of configuring the retransmission protocol. In particular, the number of transmission processes is determined based on the position of time intervals available for the transmission and may be selected in order to control the round trip time of the retransmission protocol. Once the number of transmission processes has been configured, the transmission processes are mapped on the available time intervals in a predefined order and repetitively.