Carrier Frequency Control in Multi-Carrier Systems
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Solution Overview
Problem
Existing High-speed Packet Access (HSPA) systems lack a method to adjust carrier frequencies based on quality, leading to suboptimal network performance and user experience due to varying environmental conditions.
Innovation Solution
A method and apparatus for controlling carrier frequencies in a multi-carrier/cell system by receiving Channel Quality Indicator (CQI) information, determining whether to activate or deactivate carrier frequencies based on thresholds, and instructing terminals to adjust accordingly, with Node B or RNC acting as control centers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple carrier frequencies are bound together for data transmission, then data transmission rate is improved, but network quality optimization becomes difficult due to lack of quality-based adjustment mechanism
Solution Approach 1:
The patent implements dynamic activation and deactivation of carrier frequencies based on real-time quality measurements. The network device receives CQI information from terminals, compares it against thresholds, and dynamically adjusts which carrier frequencies are active for data transmission. This dynamic mechanism allows the system to adapt to varying environmental conditions while maintaining multiple carrier frequencies bound together, thus resolving the contradiction between high data transmission rate and network quality optimization.
Solution Approach 2:
The patent establishes a feedback loop where terminals continuously report Channel Quality Indicator (CQI) information to the network device. The network device uses this feedback to determine whether to activate or deactivate specific carrier frequencies. This feedback mechanism enables quality-based optimization of the multi-carrier system, allowing the network to maintain high productivity while adapting to changing conditions through real-time quality information.
2Device complexity
If carrier frequencies are fixed without quality-based adjustment, then system complexity is reduced, but network performance deteriorates due to varying environmental conditions
Solution Approach 1:
The patent implements a self-service mechanism where terminals autonomously measure and report their own channel quality (CQI) to the network. The network device then autonomously decides which carrier frequencies to activate or deactivate based on these reports and predefined thresholds. This self-service approach minimizes the need for complex centralized control while maintaining reliable network performance through quality-based adaptation.
3Productivity
If all carrier frequencies remain active continuously, then data transmission capacity is maximized, but energy consumption increases and network resources are wasted during poor signal conditions
Solution Approach 1:
The patent implements a mechanism where carrier frequencies are discarded (deactivated) when quality measurements fall below thresholds, and recovered (activated) when quality improves above thresholds. This allows the system to maintain high data transmission capacity when conditions are good while conserving energy and network resources when signal conditions deteriorate, effectively managing the trade-off between capacity and resource consumption.
Data Source
AI summary
Methods and apparatus are provided for controlling activation or deactivation of a carrier frequency in a multi-carrier/cell system. Activation or deactivation of a subsidiary carrier frequency is determined according to a parameter associated with the subsidiary carrier frequency. When the subsidiary carrier frequency is to be activated or deactivated, a message, such as an HS-SCCH order, is transmitted to a terminal to instruct the terminal to activate or deactivate the subsidiary carrier frequency. In this manner, a certain carrier frequency can be flexibly activated or deactivated in accordance with real-time assessment of multi-carrier/cell conditions.