Cyclic Prefix Extension and LBT Type Determination for Uplink
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current mobile communication systems, particularly in 5G NR, face challenges in determining cyclic prefix (CP) extension and listen before talk (LBT) type for scheduled uplink transmissions, especially when multiple transmissions are non-consecutive, leading to inefficiencies in channel access and increased control signaling overhead.
Innovation Solution
The proposed solution involves determining CP extension and LBT type for jointly scheduled uplink transmissions, where the first transmission applies the indicated CP extension and LBT type, and the second transmission adjusts based on symbol spacing and channel occupancy time, allowing for flexible and efficient operation without increasing control signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate CP extension and LBT type indications are provided for each uplink transmission, then transmission reliability is improved, but control signaling overhead increases
Solution Approach 1:
The patent combines multiple uplink transmissions into a single joint indication mechanism. Downlink control information provides a unified CP extension indication and LBT type indication that applies to multiple discontinuous uplink transmissions, eliminating the need for separate indications for each transmission and thereby reducing control signaling overhead while maintaining transmission reliability
Solution Approach 2:
The downlink control information is designed to provide universal indications that can be applied across multiple uplink transmissions. A single CP extension indication and LBT type indication serves multiple transmissions simultaneously, making the control signaling mechanism multi-functional and reducing the overall signaling burden
2Productivity
If CP extension is applied to all uplink transmissions, then user multiplexing efficiency is improved, but device complexity increases
Solution Approach 1:
The patent applies CP extension selectively rather than universally. The network can indicate whether CP extension should be applied to specific uplink transmissions based on local conditions such as symbol spacing and channel occupancy time. This localized application approach improves user multiplexing efficiency where needed while avoiding unnecessary complexity in transmissions where CP extension is not required
3Productivity
If LBT type is dynamically indicated for each transmission, then channel access efficiency is improved, but control signaling overhead increases
Solution Approach 1:
The patent merges LBT type indications across multiple transmissions. A single LBT type indication in the downlink control information applies to multiple discontinuous uplink transmissions, reducing the number of separate LBT type signals needed while maintaining dynamic channel access optimization for each transmission
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Systems, methods, apparatuses, and computer program products for cyclic prefix (CP) extension and listen before talk (LBT) type for uplink transmissions. Specifically, certain embodiments may provide for applying a CP and/or a LBT when DCI schedules two discontinuous uplink transmissions. For example, certain embodiments may provide for determining the LBT type and CP extension for jointly scheduled aperiodic sounding reference signal (A-SRS) and physical uplink shared channel (PUSCH)/physical uplink control channel (PUCCH) transmissions. When the two or more transmissions are non-consecutive, the first one of the transmissions may apply the CP extension and the LBT type indicated by the scheduling downlink control information (DCI). For the second transmission, the CP extension may depend on the CP extension indicated in the DCI.