Carrier Aggregation Control Information Segmentation
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Solution Overview
Problem
The introduction of the Carrier Aggregation (CA) function in LTE systems leads to a reduction in radio resource use efficiency due to the need to transmit control information on a main carrier every time a sub-carrier is added or modified.
Innovation Solution
A base station and mobile station configuration that simultaneously transmits and receives a main carrier and multiple sub-carriers, where the base station notifies control information for one sub-carrier and difference information for other sub-carriers through the main carrier, allowing the mobile station to reproduce the control information for all sub-carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control information for each sub-carrier is transmitted on the main carrier every time a sub-carrier is added or modified, then the mobile station can receive complete control information for all sub-carriers, but the amount of control information to be transmitted increases, leading to reduced radio resource use efficiency
Solution Approach 1:
The control information for multiple sub-carriers is segmented into two parts: common control information (applicable to all sub-carriers) and sub-carrier-specific control information (unique to each sub-carrier). This segmentation allows the mobile station to receive complete control information while reducing redundant transmissions on the main carrier.
Solution Approach 2:
The patent uses a copy mechanism where the mobile station stores control information from a reference sub-carrier and copies it to other sub-carriers. When a sub-carrier is added or modified, only the differences (delta information) need to be transmitted, and the mobile station reproduces the complete control information by combining the copied data with the received differences.
2Reliability
If all control information for multiple sub-carriers is transmitted through the main carrier, then the mobile station can maintain accurate control information, but the main carrier bandwidth is consumed excessively, reducing overall system capacity
Solution Approach 1:
The patent extracts and separates the sub-carrier-specific control information from the main carrier transmissions. Instead of transmitting complete control information for each sub-carrier on the main carrier, only the necessary differential information is extracted and transmitted, significantly reducing main carrier bandwidth consumption while maintaining information accuracy.
Solution Approach 2:
The patent creates a universal control information structure where common control elements are defined once and applied across multiple sub-carriers. This multi-functional approach allows the same control information template to serve multiple sub-carriers, reducing the total amount of information that needs to be transmitted on the main carrier.
Data Source
AI summary
In order to improve the use efficiency of radio resources upon executing a CA function, a base station (10A) forming a communication control system simultaneously transmits and receives a main carrier (100) and a plurality of sub-carriers (101 and 102) to wirelessly communicate with a mobile station (20). Prior to this, the base station (10A) notifies, to the mobile station (20) through the main carrier (100), first control information (201) for communication using the first sub-carrier (101), and first difference information (401) on a difference between the first control information (201) and second control information (202) for communication using another sub-carrier (102). The mobile station (20) reproduces the second control information (202) by using the first control information (201) and the first difference information (401).