Local Area Base Station Cell ID Merging for Interference Reduction
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Solution Overview
Problem
Current radio communication systems in cellular networks like W-CDMA and LTE face challenges in providing high-speed wireless services in local areas such as shopping malls, requiring specialized radio communication schemes that differ from those designed for wide coverage, leading to increased battery consumption and complex cell planning due to differences in cell IDs and frequency bands between macro and pico cells.
Innovation Solution
The system assimilates local areas into a wide area by using wide area control information in the radio communication scheme for local areas, optimizing radio parameters like TTI length, RTD, CP length, subcarrier interval, and resource block width to prioritize coverage and high data rates, and utilizing user IDs for synchronization and scrambling codes to eliminate the need for area-specific cell IDs, thereby reducing interference and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate radio communication schemes are designed for wide area and local area with different cell IDs and frequency bands, then specialized high-speed wireless services can be provided in local areas, but device complexity and battery consumption increase
Solution Approach 1:
The patent merges wide area and local area radio communication schemes by allowing local area base stations to use the same cell ID as the wide area base station. This unification reduces the number of distinct parameters that mobile terminals must manage, thereby reducing device complexity while maintaining specialized local area service capabilities through differentiated radio parameters such as TTI length and frequency bands
Solution Approach 2:
The patent implements universality by enabling mobile terminals to operate in both wide area and local area modes using a unified cell ID framework. The system allows a single cell ID to serve multiple functions - identifying both wide area base stations and local area base stations, while differentiated radio parameters provide area-specific optimization without requiring separate identification systems
2Adaptability or versatility
If separate radio communication schemes with different cell IDs are used for macro and pico cells, then area-specific optimization is achieved, but cell planning becomes complex
Solution Approach 1:
The patent simplifies cell planning by merging the identification framework - local area base stations (pico cells) use the same cell ID as the wide area base station (macro cell). This eliminates the need for planners to manage separate ID schemes for different cell types, reducing planning complexity while maintaining area-specific optimization through differentiated radio parameters
3Productivity
If area-specific radio parameters are configured for local areas, then high data rates are achieved, but interference between cells increases
Solution Approach 1:
The patent applies local quality by configuring area-specific radio parameters such as shorter TTI length and different frequency bands for local area base stations while using the same cell ID. This allows local areas to be optimized for high data rates with appropriate parameter settings while the unified cell ID framework helps coordinate resource allocation to reduce inter-cell interference
Data Source
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AI summary
The present invention is designed to provide highly efficient local area radio access in a local area arranged in a wide area. A radio communication system has a wide area base station apparatus that covers a wide area, a local area base station apparatus that covers a local area arranged in the wide area, and a mobile terminal apparatus that communicates with the wide area base station apparatus by a radio communication scheme for the wide area, and that communicates with the local area base station apparatus by a radio communication scheme for the local area. The radio communication scheme for the local area is configured to utilize wide area control information that is used in the radio communication scheme for the wide area.