Uplink Control Information Transmission via Subband Contention
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Solution Overview
Problem
In communications systems, the high demand for terminal devices exceeds the available licensed spectrum resources, leading to communication congestion, reduced efficiency, increased latency, and poor user experience, especially when terminal devices need to contend for multiple time-frequency resources to transmit uplink control information.
Innovation Solution
The method allows terminal devices to contend for and use a plurality of time-frequency resources scheduled by the network device, enabling uplink channel transmission without needing to successfully contend for all allocated resources, thereby improving communication efficiency and reducing service transmission latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device performs full-bandwidth detection on the frequency-domain resource #1 (bandwidth greater than 20 MHz), then the terminal device can ensure reliable resource availability, but the communication efficiency is reduced and service transmission latency is increased
Solution Approach 1:
The patent divides the frequency-domain resource #1 into multiple subbands, each with bandwidth not greater than 20 MHz. The terminal device performs detection on each subband separately rather than on the entire bandwidth at once. This segmentation allows the terminal to efficiently detect available resources while maintaining reliability, as it can identify and use available subbands without needing to successfully contend for the entire bandwidth.
Solution Approach 2:
The patent allows the terminal device to perform detection and transmission on partial bandwidth (subbands) rather than requiring full-bandwidth detection and transmission. The terminal can successfully contend for and use a portion of the frequency-domain resource #1 (one or more subbands) without needing to obtain the entire bandwidth, thereby improving communication efficiency while ensuring reliable transmission on the obtained resources.
2Reliability
If the terminal device successfully contends for all time-frequency resources allocated by the network device, then the communication reliability is improved, but the service transmission latency is increased
Solution Approach 1:
The patent enables the terminal device to successfully contend for and use only a portion of the allocated time-frequency resources (specifically, one or more subbands of the frequency-domain resource) rather than requiring successful contention for all resources. This partial action approach reduces the time needed for resource contention while maintaining communication reliability on the obtained resources, thereby reducing service transmission latency.
Solution Approach 2:
The network device pre-allocates multiple time-frequency resources including dividing the frequency-domain resource into subbands with detectable bandwidth (≤20 MHz) before the terminal device performs contention. This preliminary segmentation and allocation enables the terminal to quickly identify and contend for available subbands without waiting for full-bandwidth resource allocation procedures, reducing transmission latency while ensuring reliable communication on the contended resources.
3Quantity of substance
If the bandwidth of the frequency-domain resource #1 is increased (greater than 20 MHz), then the data transmission capacity is improved, but the probability of successful resource contention is reduced
Solution Approach 1:
The patent segments the frequency-domain resource #1 with bandwidth greater than 20 MHz into multiple subbands, each with bandwidth not greater than 20 MHz that can be detected by the terminal device. This segmentation maintains the high data transmission capacity of the overall bandwidth while improving the resource contention success probability, as the terminal can successfully contend for one or more subbands even if it cannot obtain the entire bandwidth.
Solution Approach 2:
The patent allows the terminal device to obtain and use partial bandwidth (one or more subbands) of the frequency-domain resource #1 without requiring successful contention for the entire bandwidth. This approach maintains the advantage of large bandwidth for high data transmission capacity while improving the probability of successful resource acquisition, as the terminal only needs to successfully contend for a portion of the total resources.
Data Source
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AI summary
This application provides a method and an apparatus for transmitting uplink control information. The method includes: generating, by a terminal device, an encoded uplink data packet, where the uplink data packet belongs to an uplink channel, the uplink channel is carried on a candidate time-frequency resource in a first time transmission interval TTI, the candidate time-frequency resource is a first time-frequency resource or a second time-frequency resource, and a second time-domain start point of the second time-frequency resource is later than a first time-domain start point of the first time-frequency resource; and performing, by the terminal device, detection on a carrier in which the candidate time-frequency resource is located, and sending, by the terminal device, the uplink channel on the candidate time-frequency resource based on a result of the detection, where the uplink channel includes uplink control information and the encoded uplink data packet. Therefore, this can improve communication efficiency, reduce a service transmission latency, and improve user experience.