Multi-Slot Long PUCCH Transmission in Dynamic TDD Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in supporting high data traffic, increased data rates, and low latency while maintaining energy efficiency, particularly in transmitting long physical uplink control channels (PUCCH) effectively.
Innovation Solution
The method involves configuring a multi-slot long PUCCH using a specific number of slots determined from a starting slot, employing a slot format indicator, and utilizing pre-DFT OCC for transmitting PUCCH, which supports multiple users and large UCI payloads, and is adaptable in dynamic TDD situations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a long PUCCH is transmitted using a single slot, then the transmission time is short and latency is low, but the coverage is limited and reliability is reduced
Solution Approach 1:
The PUCCH transmission is segmented across multiple slots instead of being confined to a single slot. The transmission resource spans multiple slots, allowing the same or different PUCCH formats to be repeated across these slots. This segmentation increases the total transmission time and energy, thereby improving coverage and reliability without concentrating all transmission in one brief interval.
Solution Approach 2:
The system pre-configures the PUCCH transmission parameters including the number of slots, slot format indicators, and resource allocations before actual transmission. This preliminary configuration allows the network to prepare appropriate multi-slot resources based on predicted channel conditions and traffic patterns, ensuring optimal reliability-time tradeoff is achieved in advance.
2Length of stationary object
If multiple slots are used for PUCCH transmission, then coverage is extended and reliability is improved, but the transmission time increases and latency increases
Solution Approach 1:
The system dynamically selects the number of slots for PUCCH transmission based on real-time channel conditions, traffic requirements, and QoS parameters. The slot format indicator and resource configuration can be adjusted dynamically to match current network conditions, allowing the transmission duration to be optimized for each specific scenario rather than being fixed.
Solution Approach 2:
The patent changes key transmission parameters including subcarrier spacing, cyclic prefix length, and slot duration to adapt the PUCCH transmission to different scenarios. By adjusting these parameters, the system can extend transmission duration when needed for coverage while minimizing latency when channel conditions are good, thus managing the duration-latency tradeoff through parameter optimization.
3Productivity
If traditional PUCCH resource allocation is used, then the system is simple to implement, but it cannot support multiple users with large UCI payloads efficiently
Solution Approach 1:
The PUCCH resource allocation mechanism is designed to be universal, supporting multiple users with different UCI payload sizes using the same multi-slot transmission framework. The system can accommodate various PUCCH formats and user requirements within a unified resource allocation scheme, enabling efficient support for multiple users without requiring separate dedicated mechanisms for each user type.
Solution Approach 2:
The patent introduces an intermediary layer of resource configuration that mediates between the simple transmission requirement and the complex multi-user support need. This intermediary configuration layer handles the complexity of resource allocation, slot formatting, and user mapping, thereby shielding the actual transmission process from complexity while enabling support for multiple users with large payloads.
4Adaptability or versatility
If dynamic TDD configurations are implemented, then the system becomes more adaptable to traffic patterns, but the complexity of slot configuration increases
Solution Approach 1:
The slot configuration is made dynamic to adapt to varying traffic patterns. The system can change slot formats, uplink-downlink assignments, and PUCCH resource allocations based on real-time traffic conditions. This dynamic behavior allows the system to be highly adaptable to different traffic patterns while using standardized procedures to manage the complexity of configuration changes.
Data Source
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AI summary
The present specification provides a method for transmitting a plurality of slot-based long PUCCHs in a wireless communication system. More specifically, a method performed by a terminal comprises the steps of: receiving first information on a TDD UL-DL slot configuration from a base station; receiving, from the base station, second information including a first parameter indicating the number of slots used for transmitting PUCCHs and a second parameter indicating a PUCCH symbol interval in a PUCCH slot; determining slots for transmitting the plurality of slot-based long PUCCHs on the basis of the first information and the second information; and transmitting, to the base station, the plurality of slot-based long PUCCHs on the determined slots.