Carrier Aggregation Channel State Information Scheduling
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Solution Overview
Problem
In LTE systems, existing technologies face challenges in efficiently configuring measurement targets and transmission resources for channel state information across multiple bands, leading to decreased spectrum efficiency.
Innovation Solution
A mobile communication system where a base station and mobile station communicate using multiple component carriers, with the base station notifying the mobile station of downlink control information formats for scheduling the physical uplink shared channel, allowing the mobile station to transmit channel state information using the physical uplink shared channel in specific uplink component carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple component carriers are configured for communication between base station and mobile station, then spectrum efficiency is enhanced through flexible configuration of measurement targets and transmission resources, but device complexity increases due to multi-carrier coordination and management
Solution Approach 1:
The patent segments the communication system into multiple independent component carriers, each capable of carrying control information and data independently. This segmentation allows flexible configuration of measurement targets and transmission resources across different carriers, improving spectrum efficiency while maintaining manageable complexity through modular carrier design
Solution Approach 2:
The downlink control information format is designed with universal fields that can indicate multiple types of information (channel state information requests, uplink grants, etc.) across different component carriers. This multi-functionality allows a single control mechanism to manage diverse transmission resources, enhancing spectrum efficiency without proportionally increasing complexity
2Measurement precision
If downlink control information format includes fields for requesting channel state information across multiple bands, then measurement precision improves through specific targeting of channel state, but information processing complexity increases
Solution Approach 1:
The patent applies local quality by including specific field indicators in the downlink control information that target channel state information requests to particular component carriers or frequency bands. This allows precise measurement targeting for specific local conditions rather than uniform measurement across all carriers, improving measurement precision while reducing unnecessary processing of irrelevant information
Solution Approach 2:
The downlink control information format is pre-configured with designated fields for channel state information requests before transmission occurs. This preliminary structuring of control information allows the mobile station to efficiently parse and process requests without complex real-time analysis, reducing information processing complexity while maintaining precise measurement targeting
Data Source
AI summary
A mobile station (MS) communicates with a base station (BS) by a carrier aggregation using a plurality of downlink component carriers (DCCs). The MS receives on one or more activated DCCs. The MS receives using a PDCCH on one of activated DCCs, from the BS, first information including an information field for requesting a transmission of channel state information (CSI), the first information being used for scheduling of a PUSCH. The MS transmits using the PUSCH in a first subframe on an uplink component carrier, to the BS, first CSI for more than one activated DCCs. The MS transmits using the PUSCH in a second subframe on the uplink component carrier, to the BS, second CSI for only one activated downlink component carrier. The transmission of the second CSI is scheduled by the first information received using the PDCCH on the only one activated downlink component carrier.