Uplink Data Transmission in Inactive Mode Wireless Terminals
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Solution Overview
Problem
In next-generation mobile communication systems, terminals face delays in transmitting uplink data due to the need for previously allocated transmission resources, and there is a lack of efficient methods for managing the paging area and acquiring system information in inactive modes.
Innovation Solution
A method for a terminal to transmit uplink data without pre-allocated resources, involving the identification of paging identifiers to send appropriate RRC messages, and a mechanism for effectively setting and managing the paging area in RRC inactive mode, allowing for efficient mobility management and system information acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminals use pre-allocated transmission resources for uplink data transmission, then transmission reliability is improved, but transmission delay increases and resource utilization efficiency deteriorates
Solution Approach 1:
The patent implements dynamic resource allocation where terminals in inactive mode can transmit uplink data using dynamically assigned resources rather than static pre-allocation. The base station dynamically grants resources based on current network conditions and terminal requirements, allowing the system to adapt between reliability-oriented pre-allocation and efficiency-oriented dynamic allocation modes.
Solution Approach 2:
The patent changes the resource allocation parameter from fixed pre-allocated resources to dynamically adjustable resources. By modifying the resource allocation mechanism to support both pre-configured and dynamic grant-based transmission, the system can optimize between reliability and delay based on specific transmission scenarios.
2Loss of information
If terminals in inactive mode acquire system information frequently, then system information freshness is improved, but signaling overhead and energy consumption increase
Solution Approach 1:
The patent implements periodic system information acquisition where terminals in inactive mode acquire system information at predetermined intervals rather than continuously or on every state change. This periodic mechanism balances information freshness with energy conservation by acquiring information only when necessary based on the periodic schedule.
Solution Approach 2:
The patent applies preliminary action by pre-configuring system information acquisition parameters and paging area settings while the terminal is in inactive mode. This allows the terminal to operate with pre-acquired information for extended periods, reducing the frequency of acquisitions and thereby lowering energy consumption while maintaining adequate information freshness.
3Device complexity
If paging area is expanded to cover larger geographic regions, then terminal mobility management is simplified, but paging message transmission coverage and reliability deteriorate
Solution Approach 1:
The patent segments the paging area into multiple smaller regions or cells, each managed independently. This segmentation allows the system to maintain simplified mobility management at the network level while ensuring reliable paging message transmission within each smaller segment where signal quality is better controlled.
Solution Approach 2:
The patent introduces an additional dimension to paging area management by implementing hierarchical paging areas (e.g., local paging areas and global paging areas). This multi-dimensional approach allows the system to balance between large-area mobility management and small-area transmission reliability by routing paging messages through appropriate hierarchical levels.
Data Source
AI summary
The disclosure relates to 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). The disclosure 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. A method is provided for a terminal to transmit uplink data without a transmission resource previously allocated by a base station in a next generation mobile communication system. A method by a terminal includes while the terminal is in an inactive mode, receiving a paging message from a base station, identifying a paging identifier included in the paging message, if the paging identifier corresponds to a core network (CN) paging identifier, transmitting a first radio resource control (RRC) message, and if the paging identifier corresponds to a radio access network (RAN) paging identifier, transmitting a second RRC message.