Uplink Transmission Skipping in LAA Secondary Cells
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Solution Overview
Problem
Current radio communication systems, particularly in LTE and NR, lack a concrete procedure for efficiently transmitting uplink data, leading to inefficiencies in data transmission.
Innovation Solution
A terminal apparatus and base station apparatus are designed to exchange capability information, including parameters for Semi-Persistent Scheduling, skipping uplink transmissions when no data is available, and supporting LAA secondary cells, to optimize uplink data transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink transmission is performed according to configured grants without checking data availability, then transmission reliability is maintained, but transmission efficiency deteriorates due to unnecessary transmissions
Solution Approach 1:
The patent introduces dynamic skipping capability where the terminal apparatus can adaptively skip uplink transmissions based on real-time data availability in the buffer. The skipUplinkSPS and skipUplinkLaaSPS parameters enable the system to dynamically adjust transmission behavior, transitioning from static configured grants to flexible, condition-based transmission decisions, thereby eliminating unnecessary transmissions and improving energy efficiency.
Solution Approach 2:
The patent changes the operational parameters of the transmission system by introducing capability parameters (skipUplinkSPS, skipUplinkLaaSPS) that modify the default behavior of uplink transmissions. These parameters allow the terminal to change its transmission state from mandatory to conditional, based on buffer status, thereby optimizing the balance between transmission reliability and energy consumption.
2Device complexity
If capability information exchange procedures are simplified, then system complexity is reduced, but transmission optimization capability deteriorates
Solution Approach 1:
The patent segments the capability information exchange into distinct, modular components: SPS capability parameter, skipUplinkSPS parameter, and skipUplinkLaaSPS parameter. Each parameter addresses a specific aspect of uplink transmission capability, allowing the system to maintain comprehensive optimization capability while keeping the information exchange structure organized and manageable through clear segmentation.
3Loss of energy
If uplink transmission is skipped when no data is available, then energy consumption is reduced, but transmission reliability may deteriorate if skipping logic is incorrect
Solution Approach 1:
The patent implements a feedback mechanism where the terminal apparatus continuously monitors its data buffer status and uses this feedback to make informed transmission decisions. The skipUplinkSPS and skipUplinkLaaSPS parameters enable the terminal to feedback its capability to skip transmissions, allowing the base station to configure appropriate grants while maintaining reliability through awareness of the terminal's actual transmission needs.
Data Source
AI summary
Provided is a terminal apparatus for communicating with a base station apparatus by using a primary cell (PCell) and an LAA secondary cell (LAA SCell). A first uplink transmission corresponding to a first uplink grant configured for the PCell is skipped, based on at least a state that a first parameter is configured. A second uplink transmission corresponding to a second uplink grant configured for the LAA SCell is skipped, based on at least a state that a second parameter is configured. A third uplink transmission in the PCell and a fourth uplink transmission in the LAA SCell are skipped, based on at least a state that a third parameter is configured. The third uplink transmission corresponds to a third uplink grant corresponding to a C-RNTI. The fourth uplink transmission corresponds to a fourth uplink grant corresponding to the C-RNTI.