Radio Station Carrier Mapping for Interference Management
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Solution Overview
Problem
In LTE communication systems, the lack of individual cell IDs for non-backward compatible (NBC) and extension (EC) carriers hinders the exchange of load information between radio base stations, limiting effective interference management and throughput improvement at cell edges.
Innovation Solution
A radio communication system and method that enables the exchange of information between radio stations for carriers without individual IDs by correlating them with carriers having IDs, allowing for load information and resource usage status sharing, thereby facilitating interference avoidance and load balancing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is implemented with NBC and EC carriers, then peak data rate is improved, but load information exchange between base stations is hindered due to lack of individual cell IDs
Solution Approach 1:
The patent introduces a mapping relationship as an intermediary between carriers without cell IDs (NBC/EC) and carriers with cell IDs (BC). This mapping table, stored in both sending and receiving base stations, enables indirect information exchange by translating carrier identifiers, thus resolving the information loss problem while maintaining carrier aggregation benefits
Solution Approach 2:
The patent segments the carrier information exchange mechanism into two parts: direct exchange for carriers with cell IDs and indirect exchange via mapping for carriers without cell IDs. This segmentation allows the system to handle different carrier types differently, enabling load information exchange for NBC/EC carriers through their corresponding BC carriers
2Loss of information
If individual cell IDs are assigned to all carriers, then load information exchange is enabled, but system complexity increases due to additional identifier management
Solution Approach 1:
The patent applies local quality by assigning cell IDs only where necessary (to BC carriers that require independent identification) while leaving NBC and EC carriers without individual cell IDs. This selective approach enables load information exchange for carriers that need it without adding unnecessary complexity to the entire system
Solution Approach 2:
The patent makes the BC carrier's cell ID serve multiple functions: it identifies the BC carrier itself and also serves as a key to access the mapping relationship for associated NBC and EC carriers. This multi-functionality reduces the total number of identifiers needed in the system
3Adaptability or versatility
If carrier aggregation uses multiple carrier types, then adaptability is improved, but interference management becomes difficult without individual identifiers
Solution Approach 1:
The mapping table acts as an intermediary that connects carriers without cell IDs to their corresponding carriers with cell IDs. This enables the receiving base station to identify and manage interference from NBC and EC carriers by translating their identifiers through the mapping relationship, thus maintaining interference management capability while supporting diverse carrier types
Solution Approach 2:
The patent implements feedback mechanisms where base stations exchange load information and interference status through the mapping relationship. This feedback loop enables dynamic interference management by allowing base stations to adjust resource allocation based on real-time information about carrier load and interference conditions
Data Source
AI summary
A first radio base station informs a second radio base station about the configuration information of a second carrier, such as NBC or EC, not having an individual first identifier, as the configuration information of the second carrier is correlated with a first carrier, such as BC, having the individual first identifier. The radio station has a function of performing communication with a radio terminal using simultaneously a plurality of carriers included in the carrier set.