Uplink Control Information Transmission in Wireless Terminals
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting and receiving uplink control information, particularly in managing transmission time intervals (TTIs) to minimize latency and optimize power efficiency across different services and channels.
Innovation Solution
A method is proposed where a terminal in a wireless communication system receives an uplink grant for multiple cells and transmits uplink control information based on the relationship between the TTI lengths of uplink data and control channels, allowing for flexible transmission on the shortest TTI length or predetermined cells, and adjusting transmission strategies based on simultaneous or non-simultaneous subframe availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink control information is transmitted on the uplink control channel, then transmission reliability is improved, but transmission latency increases due to longer TTI length
Solution Approach 1:
The patent applies dynamics by making the TTI length flexible and adjustable based on service requirements. The system supports multiple TTI lengths (short and long) and dynamically selects the appropriate length based on whether the service is latency-sensitive or reliability-sensitive, allowing the transmission system to adapt its timing characteristics to different operational contexts.
Solution Approach 2:
The patent changes the TTI length parameter to resolve the contradiction. By supporting multiple TTI length configurations (short TTI for latency-sensitive services, long TTI for reliability-sensitive services), the system can optimize transmission performance by adjusting this key parameter according to service requirements.
2Loss of time
If uplink control information is transmitted on the uplink data channel, then transmission latency is reduced, but transmission reliability deteriorates
Solution Approach 1:
The system dynamically selects the transmission channel based on service requirements and TTI length configurations. For short TTI transmissions, the uplink data channel is used to reduce latency, while for long TTI transmissions, the uplink control channel is used to ensure reliability, making the channel selection adaptive rather than fixed.
Solution Approach 2:
The patent changes the transmission channel parameter based on TTI length and service type. By configuring different uplink channels (data channel for short TTI, control channel for long TTI) according to the TTI length parameter, the system optimizes both latency and reliability for different transmission scenarios.
3Adaptability or versatility
If multiple cells transmit uplink data channels with different TTI lengths, then service versatility is improved, but device complexity increases
Solution Approach 1:
The patent segments the uplink transmission system into multiple independent cells, each capable of operating with different TTI lengths. This segmentation allows each cell to be independently configured for different service types (latency-sensitive or reliability-sensitive) without affecting other cells, thereby managing complexity through modular organization.
Solution Approach 2:
The system achieves universality by designing a multi-functional uplink transmission framework that can handle both short TTI and long TTI configurations across multiple cells. The terminal and network are designed to support multiple TTI lengths and multiple uplink channels simultaneously, enabling the system to serve diverse service requirements through a unified multi-functional architecture.
4Use of energy by moving object
If the terminal supports multiple TTI lengths, then power efficiency is improved, but device complexity increases
Solution Approach 1:
The terminal implements dynamic TTI length support, allowing it to switch between short and long TTI configurations based on service requirements. This dynamic capability enables the terminal to optimize power consumption by selecting appropriate TTI lengths (shorter TTIs for low-latency services, longer TTIs for power-efficient transmissions) without requiring separate hardware for each configuration.
Solution Approach 2:
The terminal changes the TTI length parameter to optimize power efficiency. By supporting multiple TTI length configurations and selecting the appropriate length based on service requirements, the terminal can reduce power consumption for services that do not require low latency, while maintaining the capability to switch to shorter TTIs when low latency is required.
Data Source
AI summary
A method for transmitting an uplink signal for a terminal configured to support one or more transmission time interval (TTI) lengths in a wireless communication system according to an embodiment of the present invention, which is supported by a terminal, may comprise the steps of: receiving uplink grant for a plurality of cells; and if transmission timing of an uplink data channel and transmission timing of an uplink control channel according to the uplink grant overlap, transmitting uplink control information, depending on a relationship between a TTI length of the uplink data channel and a TTI length of the uplink control channel, through the uplink control channel or an uplink data channel of one cell among the plurality of cells.