Base Station Carrier Aggregation Control for LTE-A Diversity
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Solution Overview
Problem
Conventional wireless communication systems face challenges in selecting and managing component carriers for efficient communication, particularly in ensuring continuous frequency diversity and compatibility with LTE-A while supporting high-speed, large-capacity communication.
Innovation Solution
The system introduces a method where a main base station and sub-base stations dynamically select and allocate component carriers based on propagation quality and traffic conditions, using a main component carrier for primary communication and sub-component carriers for secondary communication, enabling flexible handover and data distribution across multiple carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one base station selects and manages all component carriers for a terminal, then communication control is simplified, but communication diversity and reliability are reduced
Solution Approach 1:
The patent segments the component carrier management function by designating a main base station and multiple sub-base stations. The main base station manages the main component carrier while sub-base stations manage their respective sub-component carriers. This segmentation allows the terminal to communicate with multiple base stations simultaneously through different carriers, thereby improving communication diversity and reliability while distributing the control complexity across multiple base stations.
2Reliability
If multiple base stations are used for component carrier communication, then communication diversity is improved, but carrier selection and management complexity increases
Solution Approach 1:
The patent applies local quality by assigning different roles and functions to different base stations. The main base station is responsible for selecting component carriers and managing the main component carrier, while sub-base stations are responsible for providing sub-component carriers. This division of labor reduces the overall management complexity by localizing specific functions to specific base stations while still achieving communication diversity through multiple base station involvement.
3Reliability
If component carriers are selected based on propagation quality, then connection quality is improved, but processing overhead increases
Solution Approach 1:
The patent implements preliminary action by having the main base station pre-select component carriers based on propagation quality measurements before actual data transmission begins. The main base station evaluates the propagation quality of available carriers and makes selection decisions in advance, which reduces the processing overhead and time required during active communication. This preliminary carrier selection is communicated to sub-base stations and the terminal, enabling efficient subsequent data transmission.
Data Source
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AI summary
A CA decision part selects a component carrier to be used for communication with a terminal apparatus from component carriers used for communication by a plurality of base station apparatuses. A CA set notification part notifies a sub-base station apparatus of carrier aggregation information indicating the component carrier selected by the CA decision part. A transmission unit of a main base station apparatus allocates a signal, which is obtained by modulating a part of data to be transmitted to the terminal apparatus, on a first component carrier selected by the CA decision part, and transmits the signal. A transmission unit of the sub-base station apparatus allocates a signal, which is obtained by modulating a part of the data to be transmitted to the terminal apparatus, on a second component carrier indicated by notified carrier aggregation information, and transmits the signal. A reception unit of the terminal apparatus receives the signal from the main base station apparatus using the first component carrier and the signal from the sub-base station apparatus using the second component carrier. A wireless processing part integrates the signals received by the reception unit.