Dynamic HARQ Activation in Satellite Communications
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Solution Overview
Problem
The existing HARQ mechanism in satellite communications systems lacks flexibility due to the large number of processes required, leading to increased cache sizes and transmission delays, which are not effectively managed by current semi-static or dynamic deactivation methods.
Innovation Solution
A method for dynamically indicating whether to activate or deactivate the HARQ mechanism for each data packet using scheduling information, including bit fields and process numbers, allowing for flexible selection of HARQ adoption based on specific criteria such as bit fields, process sets, and transmission times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the HARQ mechanism is deactivated dynamically for each data packet, then transmission flexibility is improved, but the complexity of scheduling information processing increases
Solution Approach 1:
The patent segments the HARQ mechanism into individually controllable units by introducing a first bit field in scheduling information that can independently indicate HARQ activation or deactivation for each data packet. This allows the system to selectively apply HARQ to specific packets rather than uniformly across all transmissions, thereby improving flexibility while keeping the control mechanism simple and manageable.
Solution Approach 2:
The patent implements dynamic HARQ control by allowing the first bit field in scheduling information to change its value (indicating activation or deactivation) on a per-packet basis. This dynamic adjustment capability enables the system to adapt HARQ usage according to real-time transmission conditions, resolving the contradiction between flexibility and complexity by providing simple binary control signals that enable sophisticated adaptive behavior.
2Reliability
If the quantity of HARQ processes is increased to accommodate satellite communication delays, then transmission reliability is improved, but the cache size at the receiver increases linearly
Solution Approach 1:
The patent extracts the HARQ mechanism from being a mandatory universal requirement and makes it selectively applicable through the first bit field in scheduling information. By taking out HARQ from the fixed system architecture and allowing it to be optionally applied to individual packets, the system can maintain transmission reliability for packets that require it while avoiding the need to maintain large cache sizes for all packets, thus resolving the contradiction between reliability and cache size.
Solution Approach 2:
The patent changes the parameter of HARQ applicability from a fixed system-wide setting to a dynamically adjustable per-packet parameter indicated by the first bit field. This parameter change allows the system to optimize the balance between transmission reliability (by applying HARQ where needed) and cache size (by not applying HARQ everywhere), thereby resolving the technical contradiction.
Data Source
AI summary
Methods for processing and indicating an HARQ mechanism, a terminal and a network side device are provided. The method includes: receiving scheduling information, the scheduling information being used to schedule transmission of a data packet; and determining whether the data packet scheduled by the scheduling information adopts the HARQ mechanism in accordance with the scheduling information.