HARQ Buffer Segmentation for Variable TTI Wireless Signals
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in signal transmission and reception due to inadequate management of Hybrid Automatic Repeat and reQuest (HARQ) buffers, particularly in managing storage space based on varying transmission time intervals (TTIs), which affects data retransmissions and overall system performance.
Innovation Solution
A method and apparatus for efficiently managing HARQ buffers by checking and allocating minimum storage space per data based on TTI lengths, where the storage space is determined by dividing the HARQ buffer space according to the number of HARQ processes corresponding to each TTI, and different TTI lengths are used for initial and retransmitted data, optimizing buffer size based on specific radio access technologies and service types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single fixed-size HARQ buffer is used for all TTI lengths, then the buffer management is simple, but the buffer space allocation is inefficient for retransmissions with different TTI lengths
Solution Approach 1:
The HARQ buffer is segmented into multiple regions, each dedicated to storing data for specific TTI lengths. This segmentation allows efficient space allocation for both initial transmissions and retransmissions with different TTI lengths, resolving the contradiction between buffer utilization efficiency and management complexity by organizing the buffer into structured zones rather than a single undifferentiated space
Solution Approach 2:
Different regions of the HARQ buffer are assigned different characteristics based on their intended use - some regions are optimized for initial transmissions while others are optimized for retransmissions with varying TTI lengths. This local differentiation allows each region to be managed according to its specific requirements, improving overall buffer efficiency without requiring complex global management
2Reliability
If the HARQ buffer size is increased to accommodate all possible TTI lengths, then retransmission reliability is improved, but the device resource consumption increases
Solution Approach 1:
The buffer allocation is made dynamic by associating different TTI lengths with specific buffer regions, allowing the system to adapt buffer usage to the actual transmission requirements. This dynamic organization ensures that sufficient buffer space is available for reliable retransmissions while avoiding the waste of allocating maximum buffer space for every possible scenario simultaneously
3Productivity
If separate buffer management is implemented for each TTI length, then transmission efficiency is improved, but the processing overhead increases
Solution Approach 1:
The buffer is segmented into distinct regions for different TTI lengths, which simplifies the management process by providing clear boundaries and allocation rules for each segment. This segmentation approach improves transmission efficiency through optimized space allocation while keeping processing overhead manageable through the structured organization
Data Source
AI summary
The present invention relates to a wireless communication system and, more particularly, to a method and an apparatus therefor, the method comprising the steps of: identifying a minimum storing area per data in a HARQ buffer on the basis of a TTI length; storing data for transmission of a wireless signal in the HARQ buffer on the basis of the minimum storing area per data; and transmitting the data in the HARQ buffer during a first TTI, wherein, when the data is retransmitted data, the minimum storing area per data is based on the length of a second TTI used for initial transmission of the data, and the length of the second TTI is different from the length of the first TTI.