LTE-A Carrier Aggregation Anchor Management
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Solution Overview
Problem
Existing multi-carrier communication systems lack detailed mechanisms for assigning and managing component carriers, particularly in LTE-A networks, leading to undefined operations such as switching between carriers and scrambling data and control channels, and fail to distinguish between backward compatible and non-compatible carriers.
Innovation Solution
The system introduces mechanisms for anchor carrier-based security key derivation, monitoring of system information, and differentiated operations for anchor and non-anchor carriers, including specific methods for Type A and Type B carriers, to manage carrier aggregation and ensure seamless communication in LTE-A networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is implemented to support wider transmission bandwidths and increase peak data rate, then data transmission capacity is improved, but system complexity and difficulty of managing multiple carriers increases
Solution Approach 1:
The patent segments carrier management by introducing a primary carrier (PCell) and secondary carriers (SCells) with distinct functional roles. The PCell handles critical functions like RRC connection, system information broadcasting, and security key derivation, while SCells focus on data transmission enhancement. This segmentation allows the system to manage multiple carriers without proportionally increasing complexity, as each carrier type has defined, limited responsibilities.
Solution Approach 2:
The patent inverts the traditional approach by having the primary carrier perform security key derivation and system information broadcasting instead of each carrier independently. Rather than treating all carriers equally, the system designates one primary carrier to handle security and control functions, while secondary carriers focus on data transmission. This inversion centralizes complex management functions, reducing overall system complexity while maintaining high data transmission capacity.
2Productivity
If multiple component carriers are aggregated and allocated to a UE, then peak data rate is increased, but the number of control channels and signaling overhead increases
Solution Approach 1:
The patent merges control channel functions by having the primary carrier's PDCCH handle resource allocation and control signaling for both the primary and secondary carriers. Instead of each carrier having independent control channels, the primary carrier's control channel is combined to manage multiple carriers, reducing the total number of control channels while maintaining the ability to support high peak data rates through multiple component carriers.
3Adaptability or versatility
If legacy UEs are allowed to access all carriers, then network compatibility is improved, but security risks increase due to inability to distinguish compatible from non-compatible carriers
Solution Approach 1:
The patent applies local quality by making carriers have different characteristics and capabilities. The primary carrier is specifically designed to be legacy-compatible with full system information broadcasting, while secondary carriers can be optimized for advanced features. This allows legacy UEs to safely access the primary carrier while advanced UEs can utilize both primary and secondary carriers, maintaining security through the primary carrier's compatibility verification while enabling network evolution.
4Reliability
If detailed mechanisms are defined for anchor carrier-based security key derivation and system information monitoring, then security and reliability are improved, but device complexity increases
Solution Approach 1:
The patent extracts security-critical functions from the general carrier set and concentrates them in the primary carrier. Specifically, security key derivation, system information broadcasting, and RRC connection management are extracted from secondary carriers and assigned exclusively to the primary carrier. This extraction simplifies the overall system by having fewer carriers perform complex security functions, reducing device complexity while maintaining high security reliability through dedicated primary carrier mechanisms.
Data Source
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AI summary
A system and method for measurement reporting is presented. At least one measurement criterion is identified for at least one of a set of assigned component carriers. The measurement criterion includes at least one of a comparison of a signal quality of a first assigned component carrier with a first threshold, a comparison of a signal quality of a neighboring cell with a second threshold, and a comparison of the signal quality of the first assigned component carrier with the signal quality of the neighboring cell. Upon detecting that the at least one criterion is satisfied, a measurement report is transmitted. In some cases the neighboring cell includes at least one of a non-serving cell, a non-assigned component carrier, or at least one of the component carriers in the set of assigned component carriers that is not the first assigned component carrier.