HARQ Process Segmentation for Buffer Management in Wireless Nodes
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Solution Overview
Problem
In non-terrestrial wireless communication networks, transmission delays are longer than in terrestrial networks, leading to challenges in HARQ configuration and buffer capacity management, particularly in scenarios with restricted buffer capabilities.
Innovation Solution
A method is proposed that involves determining a target time-frequency resource pool to control combined decoding and HARQ switching, allowing for flexible configuration of HARQ processes and buffer management, ensuring compatibility with existing systems and optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of HARQ processes or TTI length is increased to guarantee data rate in large-delay networks, then the data rate is improved, but the UE's buffer capacity requirement increases
Solution Approach 1:
The patent segments the time-frequency resources into different pools (first pool for initial transmission, second pool for retransmission) and divides HARQ processes into different types (first-type for initial transmission, second-type for retransmission). This segmentation allows independent configuration and management of different HARQ processes, enabling the system to achieve high data rates through multiple parallel HARQ processes while limiting the buffer capacity requirement for each individual process.
2Productivity
If the number of HARQ processes is increased to improve data rate, then the data rate is improved, but the device complexity increases
Solution Approach 1:
The patent introduces dynamic switching between first-type and second-type HARQ processes based on the time-frequency resource pool configuration. The network can dynamically adjust the HARQ process type according to channel conditions and traffic requirements, allowing the system to adaptively optimize data rate while managing complexity through conditional logic rather than fixed complex configurations.
Solution Approach 2:
The patent changes the parameters of HARQ processes by defining different types with distinct characteristics (initial transmission vs. retransmission). By modifying the HARQ process type parameter based on the resource pool configuration, the system can achieve different performance levels and complexity trade-offs without fundamentally changing the HARQ mechanism structure.
3Reliability
If combined decoding is used to improve link performance, then the link performance is improved, but the UE's buffer growth increases
Solution Approach 1:
The patent applies different quality requirements to different parts of the HARQ system by configuring separate time-frequency resource pools with different characteristics. The first pool is optimized for initial transmission with one set of parameters, while the second pool is optimized for retransmission with different parameters. This local quality differentiation allows combined decoding to be applied selectively to improve link performance in specific scenarios without requiring the UE to maintain large buffers for all possible retransmissions.
Data Source
AI summary
The present disclosure provides a method and a device in a communication node for wireless communications. The communication node first receives first information, the first information being used to determine a target time-frequency resource pool; and then monitors a first signaling; after that, when the first signaling is detected, the communication node receives a first radio signal; a first code block is used to generated the first radio signal; time-frequency resources occupied by the first signaling comprise a first time-frequency resource, while time-frequency resources occupied by the first radio signal comprise a second time-frequency resource; whether the first radio signal can be excluded from being used for combined decoding for the first code block is dependent on whether the first time-frequency resource belongs to the target time-frequency resource pool. The present disclosure manages to improve the flexibility of buffer configurations.