RRC Mobility State Reporting During Reestablishment and Cell Selection
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Solution Overview
Problem
There is a need for a method and apparatus to effectively report a mobility state in mobile communication systems, particularly in the context of 5G and IoT applications, to support efficient network operations and user equipment management.
Innovation Solution
A method and apparatus for reporting a mobility state in mobile communication systems, involving a terminal determining its mobility state in RRC idle or inactive mode and transmitting this information to a base station through specific messages during connection establishment or resumption procedures, utilizing system information parameters to assess mobility conditions and reporting the determined state upon transitioning to RRC connected mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If terminals continuously monitor and report mobility states in RRC connected mode, then network optimization accuracy is improved, but terminal power consumption increases
Solution Approach 1:
The terminal determines mobility state in advance during RRC idle or inactive mode before transitioning to connected mode. This preliminary determination allows the network to prepare appropriate resources and parameters before the terminal actually needs connected mode services, avoiding continuous monitoring during connected mode and reducing power consumption while maintaining accuracy.
Solution Approach 2:
Instead of continuous monitoring, the terminal performs mobility state determination periodically during idle/inactive modes and only when transitioning to connected mode. This periodic approach reduces power consumption significantly while still providing timely mobility information for network optimization.
2Productivity
If the network performs frequent mobility state assessments, then network optimization is improved, but signaling overhead increases
Solution Approach 1:
The terminal performs mobility state determination beforehand during idle/inactive modes, so when transitioning to connected mode, the mobility state is already known and can be included in the initial connection setup message. This eliminates the need for frequent post-transition assessment signaling and reduces overall signaling overhead while maintaining optimization efficiency.
Solution Approach 2:
The mobility state determination function is extracted from the RRC connected mode procedures and performed during RRC idle/inactive modes. This separation removes the signaling burden from connected mode operations, reducing signaling overhead while preserving network optimization capabilities through the extracted mobility state information.
3Measurement precision
If drive tests are conducted to accurately assess mobility states, then measurement precision is improved, but cost and time consumption increase
Solution Approach 1:
The terminal autonomously determines its own mobility state using onboard sensors and algorithms without requiring external drive test equipment or manual intervention. This self-service capability provides accurate mobility state information directly from the terminal's perspective, eliminating the need for costly and time-consuming drive tests while maintaining measurement precision.
Solution Approach 2:
Instead of using physical drive tests to measure mobility states, the system creates a virtual copy of mobility state information through terminal-based sensing and reporting mechanisms. This digital copying approach provides equivalent or superior measurement precision without the time and cost constraints of physical drive testing.
Data Source
AI summary
Provided are a method and apparatus for reporting a mobility state in a mobile communication system. A method of reporting a mobility state of a terminal in a mobile communication system includes triggering a radio resource control (RRC) connection re-establishment procedure in an RRC connected mode, determining a mobility state in the RRC connected mode, selecting a suitable cell by performing cell selection, transmitting an RRC reestablishment request message (RRC Reestablishment Request) to the selected suitable cell, and when receiving an RRC connection setup message (RRC setup) in response to the RRC connection reestablishment request from the suitable cell, including the mobility state in an RRC connection reestablishment complete message and transmitting the RRC connection reestablishment complete message to the suitable cell.