Uplink Control Information Transmission in Carrier Aggregation
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Solution Overview
Problem
Wireless communication systems face inefficiencies in transmitting uplink control information and performing random access procedures, particularly due to discordance in information transmission between user equipment (UE) and base stations, especially in carrier aggregation scenarios.
Innovation Solution
The method involves receiving uplink grants for both primary and secondary cells, scheduling PUSCH transmissions, and transmitting uplink control information on the secondary cell while dropping the first PUSCH transmission, allowing for efficient data and control information transmission and preventing information discordance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE transmits uplink control information on both primary and secondary cells simultaneously, then the uplink control information transmission capacity is improved, but the device complexity and processing overhead increase
Solution Approach 1:
The patent extracts the uplink control information from the primary cell and relocates it to the secondary cell for transmission. This is achieved by dropping the PUSCH transmission on the primary cell that would carry uplink control information, while maintaining PUSCH transmission on the secondary cell. The base station configures the UE to transmit uplink control information only on the secondary cell, thereby simplifying the transmission structure while maintaining transmission capacity.
2Adaptability or versatility
If the UE performs random access procedure on the primary cell while maintaining scheduled transmissions on both cells, then the random access capability is improved, but the reliability of information transmission deteriorates due to potential conflicts
Solution Approach 1:
The patent applies preliminary anti-action by proactively dropping the PUSCH transmission on the primary cell that could potentially conflict with random access procedures. The base station anticipates possible conflicts between scheduled transmissions and random access procedures, and pre-configures the UE to prioritize random access by eliminating conflicting transmissions on the primary cell while maintaining transmissions on the secondary cell.
3Productivity
If the UE maintains scheduled PUSCH transmissions on both primary and secondary cells in the same subframe, then the data transmission efficiency is improved, but the information discordance between UE and base station increases
Solution Approach 1:
The patent inverts the conventional approach by dropping the transmission on the primary cell (which would normally be the main data transmission cell) and maintaining transmission on the secondary cell. This inversion resolves the information discordance issue because the base station's scheduling decision to drop the primary cell transmission aligns with the UE's actual transmission behavior, eliminating the mismatch that causes information loss.
Data Source
AI summary
The present invention relates to a method and a device for transmitting uplink control information in a wireless communication system supporting carrier merging of a plurality of cells comprising a first cell and a second cell, the method comprising the steps of: receiving a first uplink grant from a base station by means of a random access response; the first uplink grant scheduling first physical uplink shared channel (PUSCH) transmission on a first cell and receiving a second uplink grant from the base station by means of a physical downlink control channel (PDCCH); and the second uplink grant scheduling a second PUSCH transmission on a second cell and, if the first PUSCH transmission and the second PUSCH transmission are configured in the same subframe, transmitting uplink control information to the base station on the second cell by means of a second PUSCH, wherein the first PUSCH transmission scheduled on the first cell is dropped.