HARQ NDI Processing for Mixed Scheduling in Wireless Systems
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Solution Overview
Problem
In wireless communication systems, Hybrid Automatic Repeat Request (HARQ) processes shared between semi-persistent and dynamic scheduling types cause significant processing load and memory overhead due to differences in how new data indicators (NDIs) are configured for respective scheduling types, making it difficult for receivers to determine whether a transmission is new or a re-transmission.
Innovation Solution
The method involves identifying scheduling information and NDIs for initial and subsequent transmissions within a HARQ process and processing the subsequent NDI as toggled, regardless of its value, when the scheduling information changes between the two transmissions, thereby simplifying the processing of NDIs across different scheduling formats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If HARQ process shares between semi-persistent and dynamic scheduling types are implemented, then scheduling flexibility and adaptability are improved, but receiver processing load and memory overhead increase significantly
Solution Approach 1:
The patent changes the parameter interpretation of NDI based on scheduling type. When scheduling type changes between semi-persistent and dynamic, the NDI is treated as toggled regardless of its actual value. This parameter change approach allows the receiver to simplify processing by using a single interpretation rule for NDI across different scheduling contexts, reducing processing complexity while maintaining scheduling flexibility
Solution Approach 2:
The patent segments the HARQ process management into distinct handling rules for different scheduling types. By identifying whether a transmission is under semi-persistent or dynamic scheduling and applying corresponding NDI interpretation rules, the system manages complexity through structured segmentation rather than uniform processing, enabling flexible scheduling while controlling receiver processing load
2Reliability
If different NDI configuration methods are used for semi-persistent and dynamic scheduling, then each scheduling type achieves optimal performance, but receiver processing complexity and memory overhead increase
Solution Approach 1:
Instead of requiring the receiver to interpret NDI values differently based on scheduling type (the conventional approach), the patent inverts the logic by treating NDI as toggled regardless of its actual value when scheduling type changes. This inversion simplifies receiver processing while maintaining reliable distinction between new and retransmitted data through the scheduling type indicator itself
3Measurement precision
If NDI is processed according to scheduling type-specific rules, then new data identification accuracy is improved, but processing time and computational overhead increase
Solution Approach 1:
The patent extracts the scheduling type information as the key indicator for NDI processing. By focusing on whether the current transmission uses different scheduling type than the previous one, the receiver can quickly determine NDI handling without complex value comparisons. This extraction approach maintains accurate new data identification while significantly reducing processing time through a single comparison operation
Data Source
AI summary
Systems and methodologies are described herein that facilitate techniques for managing respective original transmissions and re-transmissions of information within a wireless communication system. Various mechanisms are described herein for processing a new data indicator (NDI) associated with respective transmissions conducted for one or more Hybrid Automatic Repeat Request (HARQ) processes. For example, for a HARQ process shared between distinct scheduling schemes, an NDI associated with a latter transmission can be regarded as toggled irrespective of the value of the NDI upon recognizing that a utilized scheduling scheme (e.g., as indicated via a radio network temporary identifier (RNTI) or the like) has changed between successive transmissions (e.g., from semi-persistent scheduling to dynamic scheduling), thereby allowing processing of the latter transmission as a transmission of new data. As additionally described herein, various techniques are described herein for NDI processing in the case of uplink grant and downlink assignment transmission.