Uplink Control Information Encoding for Carrier Aggregation
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Solution Overview
Problem
In LTE-A carrier aggregation scenarios, simultaneously transmitting periodic CSI and HARQ acknowledgment information is challenging due to the need for separate reporting of channel state information and hybrid automatic repeat acknowledgment across multiple downlink carriers, which complicates the encoding and resource mapping processes.
Innovation Solution
A method that encodes uplink control information to generate a coded bit sequence by dividing the information into parts, using a (32, O) code for each part, performing cyclic rate matching, and combining the rate-matched sequences to enable simultaneous transmission of periodic CSI and HARQ acknowledgment information over a physical uplink channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate encoding methods are used for periodic CSI and HARQ-ACK information, then the encoding process is simple, but simultaneous transmission of both information types is not supported
Solution Approach 1:
The patent combines periodic CSI and HARQ-ACK information into a single uplink control information block for joint encoding. The base station configures the terminal to multiplex both information types in one uplink subframe, using a unified encoding process that handles both CSI and HARQ-ACK together, thereby enabling simultaneous transmission while maintaining encoding simplicity through a standardized joint encoding mechanism.
2Adaptability or versatility
If joint encoding is used for periodic CSI and HARQ-ACK information, then simultaneous transmission is supported, but the encoding complexity increases
Solution Approach 1:
The joint encoding process is segmented into distinct stages: first, periodic CSI and HARQ-ACK information are separately prepared and formatted; second, they are multiplexed into a unified uplink control information structure; third, the combined information undergoes a single encoding operation. This segmentation reduces encoding complexity by breaking down the joint encoding process into manageable, standardized steps that can be implemented efficiently.
Solution Approach 2:
The patent employs parameter changes in the encoding process, specifically using different code rates and modulation schemes based on the total amount of uplink control information. The base station configures parameters such as the number of resource elements and coding rate according to the combined size of CSI and HARQ-ACK information, allowing the encoding complexity to adapt to the actual data volume while supporting simultaneous transmission.
3Productivity
If multiple downlink carriers are accessed simultaneously, then data rate increases, but the reporting of CSI and HARQ information becomes more complex
Solution Approach 1:
The patent implements a universal reporting mechanism that handles multiple downlink carriers through a single uplink control information structure. Instead of creating separate reporting procedures for each carrier, the system uses a multi-functional uplink control channel that can carry CSI and HARQ-ACK information for multiple carriers simultaneously. This universal approach maintains data rate improvements from carrier aggregation while reducing reporting complexity through standardized procedures.
Data Source
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AI summary
The present invention discloses a method, a device, and a system for transmitting uplink control information, and relates to the communications field. The method includes: encoding uplink control information to acquire a coded bit sequence of the uplink control information, where the uplink control information includes first uplink control information and second uplink control information; and transmitting the coded bit sequence of the uplink control information to a base station through a physical uplink channel. The system includes a user equipment and a base station. By encoding uplink control information to acquire a coded bit sequence of the uplink control information and transmitting, through a physical uplink channel, the coded bit sequence to a base station, the present invention supports simultaneous transmission of first uplink control information and second uplink control information and improves transmission performance.