Carrier Aggregation Control Channel Mapping for Coexisting Mobile Systems
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Solution Overview
Problem
Current mobile communication systems, such as UMTS and LTE, face challenges in efficiently transmitting report information like CQI and ACK/NACK when multiple systems coexist, as they are not capable of supporting asymmetric uplink and downlink bandwidths, limiting the effective use of broadened frequency bands.
Innovation Solution
A mobile terminal and radio base station apparatus that aggregate multiple component carriers to create a wide system band, enabling efficient transmission of uplink control signals including report information using control channels for narrow or wide system bands, allowing for efficient communication across multiple coexisting mobile communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple mobile communication systems coexist with fixed narrow bandwidths, then system compatibility is maintained, but spectral efficiency and data rates are limited
Solution Approach 1:
The patent segments the wide system band into multiple narrow component carriers, allowing the system to maintain compatibility with legacy narrow-band systems while achieving wide-band spectral efficiency through carrier aggregation. Each component carrier can be independently managed and transmitted.
Solution Approach 2:
The patent combines multiple narrow component carriers to form a wide system band, merging their spectral resources to achieve high data rates and spectral efficiency while maintaining the ability to operate with individual narrow carriers for system compatibility.
2Productivity
If asymmetric uplink and downlink bandwidths are implemented, then data rate optimization is achieved, but system complexity increases
Solution Approach 1:
The patent implements asymmetric uplink and downlink bandwidth allocation by allowing different numbers of component carriers to be aggregated in each direction, optimizing data rates for each link while managing complexity through standardized carrier aggregation mechanisms.
3Measurement precision
If report information for each component carrier is transmitted separately, then measurement precision is improved, but signaling overhead increases
Solution Approach 1:
The patent combines report information from multiple component carriers into a single aggregated uplink control signal, reducing signaling overhead while maintaining measurement precision through structured reporting formats that preserve individual carrier quality indicators.
Data Source
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AI summary
Toprovide a mobile terminal apparatus and radio base station apparatus supporting each of a plurality of mobile communication systems when the plurality of mobile communication systems coexists, a mobile terminal apparatus of the invention is a mobile terminal apparatus in a radio communication system for performing transmission and reception in uplink and downlink each assigned to a relatively wide system band obtained by aggregating a plurality of component carriers each of which is a relatively narrow system band, and has coding and data modulation sections (101a to 101N) that perform coding and data modulation on uplink control signals including report information of individual component carriers assigned to downlink, and mapping sections (102a to 102N) that map the control signals subjected to coding and data modulation to uplink communication channels.