PUCCH Resource Determination for Multi-Format UCI Transmission
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Solution Overview
Problem
Existing LTE systems are not adapted to support uplink control channels of multiple formats with different durations, which is a requirement for future radio communication systems like LTE Rel. 14, 15, and 5G, where both short and long PUCCH formats are needed for efficient UCI transmission.
Innovation Solution
A method for determining PUCCH resources in future radio communication systems, where user terminals use a CCE index of a downlink control channel to allocate PUCCH resources based on specific selection conditions, such as the order or configuration of PDCCHs, to ensure appropriate transmission of uplink control information across various formats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing LTE systems use a single uplink control channel format with fixed duration, then the system structure is simple and easy to implement, but the system cannot support future requirements for multiple PUCCH formats with different durations
Solution Approach 1:
The patent applies dynamics by making the PUCCH resource determination adaptive to different PDCCH configurations. The system dynamically selects PUCCH resources based on whether PDCCH is configured in the last downlink subframe, allowing the same PUCCH resource determination mechanism to handle both single-format and multi-format scenarios, thus achieving adaptability without proportionally increasing system complexity
Solution Approach 2:
The patent creates a universal PUCCH resource determination method that works across different PUCCH formats (short and long formats). By using a unified approach where the PUCCH resource is determined by the CCE index of the last PDCCH regardless of PUCCH format type, the system achieves multi-functionality - the same mechanism serves both legacy and future PUCCH formats
2Reliability
If PUCCH resources are allocated without considering PDCCH configuration in the last downlink subframe, then the resource allocation is simple, but the probability of PUCCH resource collisions increases
Solution Approach 1:
The patent applies preliminary action by determining PUCCH resources based on the PDCCH configuration status in advance. The terminal checks whether PDCCH is configured in the last downlink subframe before PUCCH transmission and pre-determines the appropriate PUCCH resource accordingly. This preliminary determination prevents resource collisions by ensuring that the PUCCH resource selection accounts for potential interference from PDCCH transmissions
Solution Approach 2:
The terminal autonomously determines its own PUCCH resources by checking the PDCCH configuration in the last downlink subframe. The system enables self-service by allowing the terminal to independently assess the PDCCH configuration status and select appropriate PUCCH resources without requiring complex network coordination, thus improving reliability while keeping the mechanism relatively simple
Data Source
Figure 1A~1B
Figure 2
Figure 3A~3B
AI summary
The present invention provides a user terminal including: a receiving section that detects multiple downlink control information for scheduling downlink shared channels in a plurality of downlink control channels; and a control section that, when delivery acknowledgement information for the multiple downlink control information is transmitted in a same slot, determines an uplink control channel resource for the delivery acknowledgment information based on a control channel element (CCE) index of a downlink control channel corresponding to last specific downlink control information in a time order of the multiple downlink control information and a resource indication field in the specific downlink control information. According to this aspect of the invention, it is possible to transmit uplink control information appropriately in future radio communication systems.