Narrow-Band Terminal DRX Timing Without Cell Reselection
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Solution Overview
Problem
Low-cost Machine-Type Communication (LC-MTC) devices face challenges with reduced bandwidth, coverage enhancement, and power consumption, particularly in receiving system information broadcasted at the entire system bandwidth, and there is a lack of methods for fair coexistence in unlicensed spectrum usage.
Innovation Solution
A communication system with a narrow-bandwidth terminal device that performs discontinuous reception and determines reception conditions to move out of coverage when satisfied, maintaining an idle state and reducing power consumption, while ensuring fair coexistence in unlicensed spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If narrow-bandwidth terminal devices perform discontinuous reception and move out of cell coverage area while maintaining reception, then power consumption is reduced and system complexity is simplified, but the device must reliably determine reception conditions and timing without cell reselection
Solution Approach 1:
The base station pre-configures discontinuous reception parameters including reception timing, cycle periods, and valid time periods before the terminal device needs to operate. The terminal device uses these pre-configured parameters to determine when to perform discontinuous reception and when it has moved out of coverage area, eliminating the need for real-time cell reselection decisions and reducing power consumption while maintaining reliable operation
Solution Approach 2:
The system implements feedback mechanisms where the base station monitors terminal device reception conditions and provides corrections or updates to discontinuous reception parameters. This feedback loop ensures that even when terminal devices operate autonomously outside coverage areas, the network can adjust parameters to maintain reliable communication and correct any determination errors
2Device complexity
If narrow-bandwidth terminal devices operate without cell reselection, then system complexity is reduced, but the device must maintain accurate discontinuous reception timing over extended periods
Solution Approach 1:
The base station provides pre-configured timing parameters including reception cycle periods, valid time period durations, and reference timing information before the terminal device begins autonomous operation. These preliminary timing configurations enable the terminal device to maintain accurate discontinuous reception timing without complex real-time cell reselection procedures, reducing system complexity while preserving timing accuracy through advance preparation
Solution Approach 2:
The discontinuous reception operation follows periodic patterns with defined cycle periods and valid time periods. The terminal device performs reception at regular intervals determined by these periodic parameters, which simplifies timing maintenance compared to continuous monitoring or complex reselection procedures. The periodic structure allows the device to predict reception timing accurately over extended periods without requiring complex timing adjustment mechanisms
Data Source
AI summary
A narrow-bandwidth terminal device performs radio communication at a bandwidth narrower than a system bandwidth. The narrow-bandwidth terminal device in an idle state camps on a cell, and performs discontinuous reception of a signal transmitted from the cell. The terminal device also determines a reception condition of the signal, for example, whether the signal can be received. When it is determined that the signal cannot be received, the narrow-bandwidth terminal device moves out of a coverage area of the cell while continuing to perform the discontinuous reception. When it is determined that a discontinuous reception timer has been completed, the narrow-bandwidth terminal device continues to perform the discontinuous reception.