Uplink Transmission Channel Access Adaptation
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Solution Overview
Problem
In LTE systems, when multiple communications systems share unlicensed spectrum resources, conventional methods for uplink information transmission lead to inefficient use of channels as terminal devices are unable to access the channel in subsequent subframes even if they become available after initial detection failure, resulting in wasted opportunities for data transmission.
Innovation Solution
The proposed method allows terminal devices to share channel detection across multiple consecutive uplink subframes, enabling them to attempt transmission on subsequent subframes if the initial channel access is denied, thereby improving channel use efficiency by sending uplink information in available time slots within the same symbol set.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal device performs CCA before sending uplink information in the first of scheduled consecutive uplink subframes, then channel access control is implemented, but channel use efficiency deteriorates because the device cannot access the channel in subsequent subframes even when available
Solution Approach 1:
The patent applies dynamics by making the channel access mechanism adaptive rather than static. The terminal device dynamically adjusts its transmission behavior based on CCA results: if CCA succeeds, it transmits in the first subframe; if CCA fails, it dynamically switches to transmit in subsequent subframes instead of abandoning all transmissions. This dynamic adaptation resolves the contradiction by maintaining reliable access control while improving channel utilization efficiency.
Solution Approach 2:
The patent changes the transmission timing parameter based on CCA outcomes. Instead of fixed transmission scheduling, the system allows flexible parameter adjustment where the transmission subframe index varies depending on channel availability detection. This parameter change enables the device to optimize between access control reliability and channel efficiency by selecting appropriate transmission opportunities.
2Ease of operation
If a terminal device abandons transmission after initial channel access failure, then transmission simplicity is maintained, but uplink information transmission efficiency deteriorates due to lost opportunities in subsequent subframes
Solution Approach 1:
The patent segments the transmission opportunity into multiple independent subframe attempts rather than treating it as a single all-or-nothing event. The terminal device performs CCA once but retains the option to transmit in any of the scheduled consecutive subframes if the first attempt is blocked. This segmentation maintains operational simplicity (single CCA procedure) while dramatically improving transmission efficiency by creating multiple potential success paths.
3Loss of energy
If multiple transmission channels share one channel detection, then detection overhead is reduced, but channel access flexibility deteriorates because all channels are blocked by a single failed detection
Solution Approach 1:
The patent merges multiple transmission channel opportunities into a single CCA detection event. Instead of requiring separate CCA procedures for each scheduled subframe, the system combines them so that one successful CCA enables transmission across multiple subframes. This merging reduces detection overhead (energy and time spent on repeated CCA) while maintaining flexibility because the device can still transmit in alternative subframes if the first opportunity is unavailable.
Data Source
AI summary
An uplink information transmission method, a terminal device, and an access network device are provided. The method includes: obtaining, by a terminal device, indication information for sending uplink information on a first symbol set of a target carrier; and sending, by the terminal device, the uplink information in a second time in a time occupied by the first symbol set. The second time is a time in the time occupied by the first symbol set other than a first time, and is a time in which the terminal device is allowed to access a channel of the target carrier to send the uplink information.