Local Area Base Station Detection via Dual Radio Schemes
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Solution Overview
Problem
Current cellular communication systems, such as W-CDMA and LTE, are designed for wide areas and struggle to provide efficient radio access in local areas like shopping malls, requiring new radio communication schemes that balance capacity and coverage in local environments.
Innovation Solution
A communication system where mobile terminals detect local area base stations using different radio communication schemes than those for wide areas, transmitting detection signal measurements through an uplink channel specific to local areas, enabling quick initial connection and efficient local area radio access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a radio communication scheme designed for wide areas is used, then coverage is secured, but capacity in local areas is insufficient
Solution Approach 1:
The communication system is segmented into two distinct radio communication schemes: one optimized for wide area coverage (macro cell) and another optimized for local area capacity (small cell). This segmentation allows each scheme to operate independently in its optimal performance zone, resolving the contradiction between coverage and capacity.
Solution Approach 2:
Different radio communication schemes are applied to different spatial zones: the wide area base station uses a scheme optimized for broad coverage, while local area base stations use a scheme optimized for high capacity. This local quality differentiation enables simultaneous optimization of both coverage and capacity in their respective domains.
2Difficulty of detecting and measuring
If detection signals are transmitted using wide area radio communication scheme, then detection is possible, but connection establishment is slow
Solution Approach 1:
The mobile terminal performs preliminary detection of local area base stations using detection signals transmitted in the wide area radio communication scheme. This preliminary action allows the terminal to identify and measure local area base stations before actual data transmission begins, enabling faster connection establishment when traffic is generated.
Solution Approach 2:
Detection signals serve as an intermediary mechanism that bridges the wide area and local area radio communication schemes. These signals are transmitted using the wide area scheme for broad detectability, while their measurement results facilitate quick connection to local area base stations using the local area scheme, thus mediating between the two systems.
3Device complexity
If a unified radio communication scheme is used for both wide area and local areas, then system complexity is reduced, but performance in local areas deteriorates
Solution Approach 1:
The system dynamically selects between wide area and local area radio communication schemes based on the operational context. Mobile terminals can switch between schemes depending on whether they are in wide area mode or local area mode, allowing the system to adapt its complexity to the specific operational requirements without permanently increasing overall system complexity.
Data Source
AI summary
The present invention is designed to provide highly efficient local area radio access. A communication system, in which a mobile terminal apparatus (10) detects a local area base station apparatus (30) to connect to, among local area base station apparatuses (30), is configured such that the local area base station apparatuses (30) transmit detection signals to be used to detect the local area base station apparatus (30), to the mobile terminal apparatus (10), in a radio communication scheme for the local areas, which is different from the radio communication scheme for the wide area, and the mobile terminal apparatus (10) transmits detection signal measurement results to the local area base station apparatus (30), through an uplink channel that is defined in the radio communication scheme for the local areas.