Uplink Control Channel Transmission with Variable TTI Lengths
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting uplink control channels, particularly when dealing with overlapping transmission time intervals (TTIs) of different lengths, which can lead to latency and power efficiency issues.
Innovation Solution
A method is proposed where a terminal in a wireless communication system receives PDSCHs based on multiple TTI lengths and transmits uplink control information on a PUCCH with a shorter TTI length, allowing for efficient transmission and reception by linking the PUCCH to a CCE index or using channel selection and bundling methods, and enabling repetitive transmission when allowed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple PDSCHs with different TTI lengths are received, then service flexibility and latency reduction are improved, but uplink control channel transmission becomes complex and resource conflicts occur
Solution Approach 1:
The patent dynamically selects the TTI length of the PUCCH based on the TTI lengths of multiple received PDSCHs. When PDSCHs have different TTI lengths, the system determines whether to use a shorter or longer TTI for the uplink control channel transmission, allowing flexible adaptation to different service requirements while managing resource conflicts
Solution Approach 2:
The patent changes the TTI parameter of the uplink control channel based on the received downlink channels. By adjusting the TTI length parameter of the PUCCH according to the PDSCH configurations, the system optimizes resource usage and resolves transmission conflicts between different TTI lengths
2Speed
If uplink control channels for multiple PDSCHs are transmitted simultaneously, then response speed is improved, but resource conflicts and transmission errors increase
Solution Approach 1:
The patent performs preliminary determination of the PUCCH TTI length before actual transmission. By calculating and selecting the appropriate TTI length in advance based on the received PDSCH configurations, the system avoids resource conflicts during simultaneous transmissions and ensures reliable delivery of uplink control information
3Device complexity
If a longer TTI is used for uplink control channel, then resource allocation is simplified, but latency increases
Solution Approach 1:
The system dynamically adjusts the PUCCH TTI length based on the specific transmission scenario. When multiple PDSCHs with different TTI lengths are received, the patent selects the appropriate PUCCH TTI length to balance resource allocation simplicity and latency requirements, rather than using a fixed long TTI
Data Source
AI summary
A method for transmitting an uplink control channel for a terminal configured to support multiple transmission time interval (TTI) lengths in a wireless communication system according to an embodiment of the present invention is performed by the terminal and may comprises the steps of: receiving a first physical downlink shared channel (PDSCH) according to a first TTI length at a first time point; receiving a second PDSCH according to a second TTI length differing from the first TTI length at a second time point; and when TTIs for transmitting uplink control channels for the received first PDSCH and second PDSCH overlap, transmitting uplink control information for the first PDSCH and second PDSCH on a physical uplink control channel (PUCCH) having the shorter TTI length among the first TTI length and the second TTI length.