Two-Stage Downlink Control Channel Scheduling for Forward Compatibility
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Solution Overview
Problem
In LTE networks, single-step downlink control channel scheduling results in poor forward compatibility and hardware flexibility due to fixed DCI size, which is inflexible when new features are introduced, affecting UE blind detection and hardware decoding.
Innovation Solution
A two-stage scheduling method is proposed, where the DCI is divided into basic and extended DCI, with the basic DCI providing basic scheduling information and the extended DCI offering additional details like transmission schemes and interference assistance, allowing UE to blindly decode only the basic DCI and obtain extended information through higher layer signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If single-step DCI scheduling is used with fixed DCI size, then UE blind detection is simplified, but forward compatibility and hardware flexibility deteriorate when new features are introduced
Solution Approach 1:
The DCI is segmented into two parts: a basic DCI part with fixed size that UEs blindly detect, and an extended DCI part with variable size that provides additional scheduling information. This segmentation allows the basic part to maintain simplicity for blind detection while the extended part provides adaptability for new features without requiring changes to the basic structure.
2Device complexity
If single-step DCI scheduling with fixed DCI size is used, then hardware decoding is simplified, but hardware flexibility deteriorates when new features are introduced
Solution Approach 1:
The DCI structure is divided into a basic part with fixed size that can be efficiently decoded by hardware, and an extended part with variable size that accommodates new features. This segmentation allows hardware to maintain optimized decoding for the basic part while remaining flexible through the extended part.
3Adaptability or versatility
If new DCI formats are defined to support new features, then feature support is improved, but DCI size determination and UE blind detection behavior become complex
Solution Approach 1:
Instead of creating new DCI formats for each feature, the patent segments DCI into basic and extended parts. New features are added to the extended part, which has flexible size and structure, while the basic part remains unchanged, avoiding complexity in size determination and blind detection.
Solution Approach 2:
The extended DCI part serves as a universal container that can accommodate multiple different features and functionalities without requiring separate DCI formats. This multi-functional approach simplifies the overall DCI structure while supporting diverse features.
Data Source
AI summary
A method of two-stage scheduling in downlink control channel is proposed to enhance downlink control information (DCI) forward compatibility and hardware flexibility. The DCI comprises a basic DCI and an extended DCI. The basic DCI provides basic scheduling information of the scheduled data. The extended DCI provides extended scheduling information of the scheduled data channel. The basic DCI can be unicast to a single UE over UE-specific search space. The basic DCI can also be broadcast or multicast to a group of UEs over common search space. UE performs blind detection of the basic DCI only, while the location and size of the extended DCI can be provided by the basic DCI or provided by a higher layer signaling. Cross-slot/subframe and Multi-slot/subframe scheduling can also be applied in the two-stage scheduling.