Narrowband Terminal Cell Selection via Dual Synchronous Signals
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Solution Overview
Problem
Existing cell search and selection processes in LTE systems are inefficient for Machine Type Communication (MTC) devices, which operate at narrower bandwidths and require reduced power consumption, as they are based on processes designed for normal terminals with wider bandwidths, leading to increased energy consumption and inefficiency.
Innovation Solution
A method for cell selection in narrowband terminals, involving the reception of radio frames with both first and second synchronous signals, where the second synchronous signal is used to search and select neighboring cells with a narrower bandwidth, specifically utilizing Zadoff-Chu sequences for signal generation and transmission, allowing efficient cell search and selection with reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing cell search and selection processes designed for normal terminals are used for MTC devices, then the processes can be performed using standard procedures, but power consumption increases and efficiency decreases due to wider bandwidth requirements
Solution Approach 1:
The patent changes the bandwidth parameter from the standard wide bandwidth used in normal LTE terminals to a narrow bandwidth specifically designed for MTC devices. This parameter change allows MTC devices to perform cell selection with reduced power consumption while maintaining compatibility with the LTE network infrastructure.
Solution Approach 2:
The patent segments the cell selection process into two distinct parts: receiving both first synchronous signals (for wide bandwidth) and second synchronous signals (for narrow bandwidth), and then selecting appropriate neighboring cells based on the narrow bandwidth signals. This segmentation allows MTC devices to focus only on relevant narrow bandwidth signals for cell selection, improving efficiency.
2Device complexity
If narrow operation frequency bandwidth is configured to reduce complexity of RF unit, then hardware cost and power consumption are reduced, but cell search and selection processes become less efficient
Solution Approach 1:
The patent applies preliminary action by having the base station pre-configure and transmit the second synchronous signal specifically designed for narrow bandwidth MTC devices. This allows MTC devices to directly use the pre-prepared narrow bandwidth signal for cell search and selection, eliminating the need for complex wide bandwidth processing while maintaining efficient cell selection performance.
3Adaptability or versatility
If standard synchronous signals are used for cell search, then compatibility with existing LTE infrastructure is maintained, but MTC devices cannot efficiently search for neighboring cells with reduced bandwidth
Solution Approach 1:
The patent implements universality by designing a dual-signal system where the base station transmits both first synchronous signals (for wide bandwidth normal terminals) and second synchronous signals (for narrow bandwidth MTC devices). This multi-functionality allows the same LTE infrastructure to serve both normal terminals and MTC devices efficiently, with each device type using the appropriate signal type for its bandwidth requirements.
Data Source
AI summary
Provided are a method for cell selection for a narrowband terminal and an apparatus using same. A narrowband terminal receives a wireless frame comprising a first synchronous signal for a user equipment supporting a first bandwidth, and a second synchronous signal for a user equipment supporting a second bandwidth which is narrower than the first bandwidth. The narrowband terminal searches at least one neighboring cell on the basis of the second synchronous signal. The narrowband terminal selects at least one cell from among one or more neighboring cells.