HARQ Process Management for Multicarrier Adaptability
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Solution Overview
Problem
Current multicarrier communication systems face challenges in efficiently managing hybrid Automatic Repeat Request (HARQ) processes, particularly in dynamically adapting to varying radio conditions and ensuring reliable data transmission across different numerologies and transmission timings.
Innovation Solution
The implementation of advanced HARQ processes within the Radio Access Network (RAN) architecture, utilizing next-generation Node B (gNB) and evolved Node B (ng-eNB) nodes, which employ dynamic modulation and coding schemes, hybrid transmission mechanisms, and advanced protocol stacks to optimize HARQ operations across multiple carriers and numerologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional HARQ processes are used in multicarrier systems, then system complexity is reduced, but adaptability to varying radio conditions and numerologies deteriorates
Solution Approach 1:
The patent segments the HARQ process into separate components: HARQ process management is separated from numerology management, allowing independent optimization of each function. The HARQ entity maintains process identifiers separately from the multiple numerology configurations, enabling the system to handle varying radio conditions across different numerologies without increasing overall HARQ complexity
Solution Approach 2:
The patent implements a universal HARQ process that can operate across multiple numerologies simultaneously. A single HARQ process identifier can be associated with different numerologies based on scheduling decisions, allowing the same HARQ infrastructure to serve multiple transmission formats and radio conditions without requiring separate HARQ processes for each numerology
2Adaptability or versatility
If multiple numerologies are supported simultaneously, then system versatility improves, but HARQ process management complexity increases
Solution Approach 1:
The patent introduces an intermediary mapping mechanism between HARQ process identifiers and numerologies. The scheduling entity acts as an intermediary that decides which numerology a particular HARQ process should use based on current radio conditions and traffic requirements, abstracting the complexity of multiple numerologies from the HARQ management function
Solution Approach 2:
The patent adds a numerology dimension to the traditional HARQ process by allowing HARQ process identifiers to be associated with multiple numerology configurations. This dimensional extension enables the system to support diverse numerologies while maintaining a unified HARQ management structure, effectively managing complexity through structured organization
3Reliability
If dynamic adaptation to radio conditions is implemented, then transmission reliability improves, but processing overhead increases
Solution Approach 1:
The patent implements dynamic adaptation by allowing the association between HARQ process identifiers and numerologies to change based on real-time radio conditions. The scheduling entity can dynamically reassign numerologies to active HARQ processes without requiring process reinitialization, maintaining reliability through continuous adaptation while minimizing processing overhead by preserving existing process states
Data Source
AI summary
A base station sends, to a wireless device, a first downlink control information (DCI) comprising a first HARQ process identifier, a first NDI comprising a first value, and an indication to postpone a HARQ acknowledgement transmission for a HARQ process identified by the first HARQ process identifier. The base station sends, to the wireless device, a second DCI comprising the first HARQ process identifier and a second NDI comprising a second value. The base station sends, to the wireless device and based on the second DCI, a transport block corresponding to the first HARQ process identifier.