Macro Cell System Information Acquisition for Small Cell Connection
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Solution Overview
Problem
Existing communication systems for small cells face challenges in efficiently transmitting system information, leading to prolonged connection times for terminal devices as they enter or exit small cells, due to limited reception areas and higher frequency of entry/exit events compared to macro cells.
Innovation Solution
A communication control device and method that acquires and controls downlink transmission of system information in macro cells, notifying terminal devices within the macro cell of radio resources used in the small cells, allowing for overlapping frequency bands and separate transmission of macro and pico system information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If system information of small cells is transmitted only by base stations of the small cells, then the transmission structure is simple, but the area in which terminal devices can receive system information is limited and connection time increases
Solution Approach 1:
The patent merges the system information transmission function from small cell base stations to macro cell base stations. The macro cell base station transmits system information of both macro cells and small cells, allowing terminal devices to acquire small cell system information while still connected to the macro cell, thereby expanding the reception area and reducing connection time without requiring separate small cell base station transmissions.
Solution Approach 2:
The patent implements preliminary transmission of system information by having macro cell base stations transmit small cell system information in advance before terminal devices actually enter the small cells. This allows terminal devices to acquire system information proactively while in the macro cell coverage area, so that when they enter small cells, the cell search and connection processes can proceed without delay.
2Productivity
If system information is transmitted only in small cells, then the transmission resources are dedicated, but terminal devices must repeatedly receive system information when entering/exiting small cells frequently
Solution Approach 1:
The patent combines the system information transmission for both macro cells and small cells into a single transmission source (macro cell base station). This allows terminal devices to acquire all necessary system information during their connection to the macro cell, eliminating the need to repeatedly perform cell searches and receive system information when transitioning between macro and small cells, thereby improving connection efficiency.
3Area of stationary object
If macro cell base station transmits small cell system information, then the acquisition area is expanded, but the transmission resource allocation becomes more complex
Solution Approach 1:
The patent segments the system information transmission by allocating specific time-frequency resources for small cell system information within the macro cell's transmission framework. This segmentation allows the macro cell base station to transmit both macro and small cell system information in an organized manner, managing resource allocation complexity while expanding the acquisition area.
Data Source
AI summary
There is provided a communication control device including an acquisition unit configured to acquire system information of a frequency band that is used in a small cell that is partially or entirely overlapped by a macro cell, and a control unit configured to control downlink transmission of the system information in the macro cell. The control unit notifies a terminal device positioned within the macro cell of radio resource that is used in the downlink transmission.