Grant-Free Resource Activation via HARQ Process Number in 5G
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Solution Overview
Problem
Current wireless communication systems, particularly 5G, face challenges in efficiently activating and releasing grant-free resources, which are crucial for providing low-latency and high-reliability services like URLLC, due to complexities in resource management and control information transmission.
Innovation Solution
The method involves a terminal and a base station exchanging downlink control information (DCI) to identify and manage grant-free resources, specifically using HARQ process numbers to activate or release resources configured for each cell and bandwidth part, enabling efficient support for grant-free based data transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If grant-free resources are configured for each cell and bandwidth part to support low-latency services, then service reliability is improved, but resource management complexity increases
Solution Approach 1:
The patent segments grant-free resources by configuring them separately for each cell and bandwidth part (BWP). This segmentation allows independent management and activation of resources in different frequency and spatial domains, improving service reliability for low-latency applications while enabling granular control to manage complexity through localized resource allocation.
Solution Approach 2:
The patent implements dynamic activation and release of grant-free resources through DCI signaling. Resources can be activated or released on-demand based on traffic requirements, allowing the system to adapt resource allocation dynamically. This dynamic approach maintains high reliability when needed while reducing effective resource management complexity by activating only necessary resources.
2Adaptability or versatility
If DCI signaling is used to activate and release grant-free resources, then resource allocation flexibility is improved, but control information transmission overhead increases
Solution Approach 1:
The patent uses DCI format 0_1 and 1_1 which are multi-purpose control formats capable of carrying both dynamic scheduling information and grant-free resource activation/release commands. By making these DCI formats universal, the system achieves flexible resource allocation without requiring separate dedicated signaling formats, thereby controlling information overhead while maintaining adaptability.
Solution Approach 2:
The patent employs specific parameter configurations within DCI to indicate activation or release of grant-free resources. By utilizing existing DCI fields with specific parameter values (e.g., NDI=0 for activation, NDI=1 for release), the system achieves flexible resource control without increasing message length, effectively managing the trade-off between flexibility and overhead.
3Adaptability or versatility
If multiple grant-free resources are configured for different cells and BWPs, then service coverage is improved, but identification and management difficulty increases
Solution Approach 1:
The patent applies local quality by configuring grant-free resources with cell-specific and BWP-specific parameters. Each resource is identified by unique combinations of cell ID, BWP ID, and resource configuration indices. This localized configuration approach expands service coverage across multiple cells and BWPs while maintaining clear identification through localized parameters that are meaningful only within their specific context.
Solution Approach 2:
The patent uses DCI signaling as an intermediary to manage multiple grant-free resources. The DCI carries resource indication information that maps to specific configured resources, acting as a mediator between the network's resource configuration and the terminal's resource usage. This intermediary mechanism simplifies identification by providing a unified signaling interface for managing resources across multiple cells and BWPs.
Data Source
AI summary
A communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT) are provided. The system and method provides for receiving, from a base station, downlink control information (DCI) including information on a hybrid automatic repeat request (HARQ) process number, identifying at least one grant free resource corresponding to the information on the HARQ process number, and releasing the at least one grant free resource based on the information. The disclosure discloses a grant-free based data transmission method in a wireless communication system that may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services.