Base Station RLF Reporting Precision in ABS Environments
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Solution Overview
Problem
The precision of radio link failure (RLF) reporting is reduced in environments using Almost Blank Subframes (ABS) due to differing measurement values between ABS and non-ABS subframes, affecting the base station's grasp of the terminal's state.
Innovation Solution
A wireless communication system that includes a base station and terminal, where the terminal measures and reports RLF information using measurement resource restrictions, allowing comparison of results with and without these restrictions, enhancing precision of RLF reporting, thereby enabling the solution addresses the precision issue by allowing the base station to accurately assess the terminal's state even in ABS environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If measurement resource restrictions are applied in ABS environments, then the base station can accurately determine the terminal's state, but the measurement precision of RLF reporting is reduced due to differing measurement values between ABS and non-ABS subframes
Solution Approach 1:
The patent segments the measurement process into two distinct parts: measurements performed with ABS (Almost Blank Subframe) and measurements performed without ABS. The terminal separately measures reference signal received power (RSRP) and reference signal received quality (RSRQ) in both conditions, allowing the base station to receive and compare segmented measurement results to determine the most appropriate value for RLF reporting, thereby resolving the contradiction between measurement precision and reliability.
2Loss of information
If the terminal reports RLF information without measurement resource restrictions, then signaling overhead is reduced, but the precision of RLF reporting is compromised in ABS environments
Solution Approach 1:
The patent implements preliminary action by having the terminal pre-perform measurements under both ABS and non-ABS conditions before the actual RLF reporting event. The terminal stores these pre-measured values and selectively reports the appropriate one based on current network conditions, avoiding the need for repeated measurements and reducing signaling overhead while maintaining precision.
3Productivity
If the base station requests detailed RLF report information, then network optimization is improved, but transmission power and traffic volume increase
Solution Approach 1:
The patent enables self-service by allowing the terminal to autonomously determine which measurement value (with or without ABS) to report based on pre-configured criteria and current conditions. The terminal independently selects and reports only the necessary measurement data without requiring the base station to request multiple different measurement sets, thereby reducing transmission power and traffic volume while still providing sufficient information for network optimization.
Data Source
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AI summary
An integrated circuit which, in operation, controls a process of a wireless communication terminal for use in a wireless communication system in which a carrier aggregation including a primary cell and a secondary cell is used, for performing a control not to transmit signals, or to transmit signals with a reduction in a transmission power in a part of radio resources for a downlink signal in a communication cell provided by a wireless communication base station, the process comprising: receiving control information for generating a report related to a measurement result of the communication cell provided by the wireless communication base station; monitoring a state of a radio link with an own cell, which is a communication cell in connection, the own cell corresponding either to the primary cell or to the secondary cell; performing a measurement on a reception of the downlink signal in the communication cell provided by the wireless communication base station; generating a radio link failure report including a measurement result when a radio link failure occurs in the own cell; and transmitting the radio link failure report, wherein if an instruction for restricting the measurement to a part of the radio resources is included in the control information from the wireless communication base station after the radio link failure occurs, the process generates the radio link failure report including a measurement result in the radio resources as instructed when the radio link failure occurs.