RRC Inactive Small Data Transmission Using Preconfigured RACH
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in performing wireless signal transmission and reception procedures, particularly in managing small data transmissions (SDT) in radio resource control (RRC) inactive states, which affect the quality and reliability of communication services.
Innovation Solution
A method and apparatus for wireless communication systems that involve receiving SDT configuration information, switching to an RRC inactive state, and triggering a random access channel (RACH) based on predefined conditions, including quality of service thresholds and resource configurations, to efficiently transmit small data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the system uses traditional wireless signal transmission procedures, then the communication service is provided, but the transmission efficiency is low and resource utilization is poor
Solution Approach 1:
The system pre-configures SDT parameters, RACH resources, and CG resources before the UE enters RRC inactive state. This preliminary configuration enables the UE to quickly transmit small data without undergoing full connection setup procedures, thereby improving transmission efficiency and reducing procedure execution time
Solution Approach 2:
The patent segments the data transmission process by introducing a specific SDT procedure for small data packets, separate from the traditional full connection setup. This segmentation allows small data to be transmitted through optimized RACH-based procedures while larger data uses conventional methods, improving overall system productivity
2Reliability
If the system maintains RRC connected state for small data transmission, then the transmission reliability is maintained, but the energy consumption increases and system resources are wasted
Solution Approach 1:
The system changes the RRC state parameter from connected to inactive for small data transmission scenarios. In this intermediate inactive state, the UE maintains minimal context information and can quickly resume transmission using pre-configured SDT parameters, thereby reducing energy consumption while maintaining sufficient communication reliability through optimized RACH procedures
Solution Approach 2:
The patent extracts the essential transmission functionality from the full RRC connected state, creating a simplified SDT procedure that operates from RRC inactive state. This extraction removes unnecessary overhead and energy-consuming procedures while retaining the core capability to transmit small data reliably
3Use of energy by moving object
If the system uses RACH procedure for SDT in RRC inactive state, then the energy consumption is reduced, but the transmission complexity increases
Solution Approach 1:
The system performs preliminary configuration of SDT parameters, RACH resources, and CG resources while the UE is still in connected state before transitioning to inactive state. This preliminary action simplifies the subsequent SDT procedure from inactive state, as the UE can directly use pre-configured parameters without complex decision-making, thereby reducing transmission procedure complexity while maintaining low energy consumption
Solution Approach 2:
The patent introduces pre-configured SDT parameters and RACH resources as intermediaries that bridge the gap between RRC inactive state and efficient data transmission. These pre-configured elements simplify the transmission procedure by providing ready-to-use parameters, reducing the complexity the UE would otherwise face when initiating transmission from inactive state
4Adaptability or versatility
If the system configures both CG resource and RACH resource for SDT, then the transmission flexibility is improved, but the configuration complexity increases
Solution Approach 1:
The system dynamically selects between CG-based transmission and RACH-based SDT transmission based on real-time conditions such as data size, channel state, and UE mobility. This dynamic selection mechanism provides transmission flexibility by adapting to different scenarios, while the underlying configuration framework manages the complexity through standardized procedures and clear selection criteria
Data Source
AI summary
Various embodiments of the present disclosure relate to a next-generation wireless communication system for supporting high data transfer rates beyond the 4th generation (4G) wireless communication system. According to the various embodiments, a method of transmitting and receiving signals in a wireless communication system and apparatus for supporting the same may be provided.