DCI-Based Channel Access Type Selection for High-Frequency Uplink
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Solution Overview
Problem
There is a need to indicate a channel access mode for physical uplink channel transmission in high-frequency bands, particularly in unlicensed spectrum scenarios, where traditional Listen Before Talk (LBT) principles are insufficient for efficient communication.
Innovation Solution
A method where a network device transmits Downlink Control Information (DCI) to a terminal device, indicating a target channel access type for physical uplink channel transmission in high-frequency bands, which can be uplink channel access without LBT, with short LBT, or conventional LBT, allowing the terminal device to determine the appropriate access type based on the DCI format.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional Listen Before Talk (LBT) principle is used for channel access in unlicensed spectrum, then channel collision is reduced and fair coexistence is achieved, but communication efficiency deteriorates due to frequent channel access delays
Solution Approach 1:
The patent dynamically adjusts the LBT mechanism by introducing multiple channel access types (full LBT, short LBT, no LBT) that can be flexibly selected based on channel conditions and traffic requirements. The network device configures different channelAccessType parameters to adapt the LBT behavior, allowing the system to transition between conservative (full LBT) and aggressive (no LBT) access modes, thereby resolving the contradiction between reliability and efficiency
Solution Approach 2:
The patent changes the LBT parameters by introducing a channelAccessType parameter that can take different values (e.g., type1, type2, type3) corresponding to different LBT durations and procedures. By modifying these parameters based on channel occupancy time, traffic priority, and interference conditions, the system can optimize the balance between collision avoidance and access efficiency, allowing full LBT when reliability is critical and no LBT when efficiency is prioritized
2Productivity
If channel access without LBT is used, then communication efficiency is improved by reducing access delays, but channel collision probability increases
Solution Approach 1:
The system dynamically switches between no LBT and full LBT modes based on real-time channel conditions. When the channel is determined to be idle for a sufficient period or when the device has channel occupancy rights, no LBT is performed for immediate access. When channel conditions are uncertain or contention is detected, full LBT is executed to ensure reliable access, thus adapting the reliability-efficiency tradeoff dynamically
3Productivity
If channel access with short LBT is used, then a balance between efficiency and reliability is achieved, but compatibility with traditional LBT systems deteriorates
Solution Approach 1:
The patent implements a universal LBT framework that incorporates multiple access types (full LBT, short LBT, no LBT) within a single channel access mechanism. This multi-functional design allows the system to maintain compatibility with traditional full LBT systems while also supporting shortened LBT variants for improved efficiency. The network device can configure appropriate LBT types based on the operational scenario, ensuring both backward compatibility and enhanced performance where applicable
Data Source
AI summary
A method for wireless communication includes that: a terminal device receives downlink control information (DCI) sent by a network device; and based on a format of the DCI, the terminal device determines, among a plurality of channel access types, a target channel access type for physical uplink channel transmission in a high frequency band, where the plurality of channel access types include at least one of: uplink channel access without listen before talk (LBT); uplink channel access with a short LBT; or uplink channel access with a conventional LBT. A terminal device and a network device are also provided.