Uplink Control Information Transmission in TDD Systems
Solution Overview
Problem
Wireless communication systems face inefficiencies in transmitting control information, particularly when multiple uplink control information need to be transmitted in the same subframe, leading to resource management challenges.
Innovation Solution
A method and apparatus for transmitting uplink control information in a Time Division Duplex (TDD) wireless communication system, where reception response information and channel status information are managed using specific PUCCH formats based on collision conditions, including the detection of Downlink Assignment Index (DAI) and Semi-Persistent Scheduling (SPS) indicators, to efficiently allocate resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple uplink control information are transmitted in the same subframe, then the system can maintain comprehensive control feedback, but resource management complexity increases
Solution Approach 1:
The patent segments uplink control information into different types (ACK/NACK, CSI, SR) and assigns them to different PUCCH formats and resources. This segmentation allows the system to handle multiple control information types simultaneously while managing resources efficiently through format-specific allocation rules.
Solution Approach 2:
The patent implements dynamic resource allocation where PUCCH resources are selected based on real-time collision conditions and downlink assignment index (DAI) values. The system dynamically adjusts which PUCCH format to use and which resources to allocate, enabling flexible management of multiple control information transmissions without fixed rigid structures.
2Productivity
If reception response information and channel status information are transmitted together, then resource efficiency improves, but transmission format complexity increases
Solution Approach 1:
The patent merges reception response information (ACK/NACK) and channel status information (CSI) into a single PUCCH transmission when conditions permit. By combining these information types using specific PUCCH formats (e.g., format 2, 2a, or 2b), the system improves resource efficiency by reducing the number of separate transmissions while managing format complexity through standardized combination rules.
Solution Approach 2:
The patent changes transmission parameters (PUCCH format selection, resource allocation) based on the type and combination of control information being transmitted. By adjusting parameters like format type and resource index according to specific conditions (DAI value, collision presence), the system optimizes resource efficiency while handling format complexity through parameter-based adaptation.
3Reliability
If channel status information is dropped during collision, then transmission reliability of critical information improves, but information completeness deteriorates
Solution Approach 1:
The patent applies preliminary anti-action by proactively dropping channel status information (CSI) when a collision with reception response information (ACK/NACK) is detected. This preventive measure ensures that critical ACK/NACK information is transmitted reliably without interference, sacrificing CSI completeness in favor of maintaining system reliability for more critical control feedback.
Solution Approach 2:
The patent converts the harmful collision effect into a beneficial prioritization mechanism. By deliberately dropping CSI during collisions, the system ensures that ACK/NACK information receives dedicated resources and maintains high reliability. This intentional information loss transforms the collision problem into a structured priority-based transmission scheme that benefits overall system reliability.
Data Source
AI summary
A method and a communication apparatus for transmitting uplink control information in a wireless communication system using time division duplex (TDD). The method according to an embodiment includes receiving at least one physical downlink control channel (PDCCH) or at least one physical downlink shared channel (PDSCH); and generating reception response information for the at least one PDCCH or the at least one PDSCH. When the reception response information and channel status information are configured to be transmitted in a same subframe and a first physical uplink control channel (PUCCH) format is configured for the communication apparatus, if a certain condition is satisfied, the reception response information and the channel status information are transmitted together using a second PUCCH format. The certain condition includes a first condition of a single PDSCH transmission only on a primary cell (PCell) where there is not a corresponding PDCCH being present.