Uplink Transmission Skipping in Carrier Aggregation
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Solution Overview
Problem
Current multicarrier communication systems face challenges in efficiently managing carrier aggregation and dual connectivity, particularly in handling high data traffic demands and seamless mobility, which require advanced spectrum management and radio resource optimization.
Innovation Solution
The implementation of carrier aggregation and dual connectivity mechanisms, including orthogonal frequency division multiplexing (OFDM) and licensed assisted access (LAA), enables efficient use of both licensed and unlicensed spectrum, with adaptive clear channel assessment and dynamic resource allocation to optimize network performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink transmission is performed frequently to maintain connection and send data, then data transmission reliability is improved, but uplink transmission overhead increases and network resources are wasted
Solution Approach 1:
The patent implements periodic connection maintenance where the UE performs uplink transmissions at scheduled intervals (e.g., every 10ms or 20ms) rather than continuously. This periodic action maintains the connection reliability while significantly reducing the overall transmission overhead and energy consumption compared to continuous transmissions.
Solution Approach 2:
The network configures the UE with autonomous parameters including uplink skipping indicators, periodic transmission intervals, and grant-free transmission resources. The UE then autonomously decides whether to skip or perform transmissions based on its buffer status and the configured parameters, eliminating the need for continuous network scheduling commands and reducing control signaling overhead.
2Productivity
If carrier aggregation is implemented to increase network capacity, then data rates are improved, but device complexity and spectrum management difficulty increase
Solution Approach 1:
The patent divides the carrier aggregation management into separate functional components: primary cell (PCell) for control plane operations, primary secondary cell (PSCell) for additional control functions, and secondary cells (SCell) for data plane operations. This segmentation allows independent management of control and data functions across multiple carriers, reducing overall system complexity.
Solution Approach 2:
The patent implements dual connectivity where a single UE can simultaneously connect to multiple base stations (Master eNB and Secondary eNB) across different carrier groups. This multi-functional connection allows the system to handle diverse traffic types (e.g., enhanced Mobile Broadband, Machine Type Communication, Ultra-Reliable Low Latency Communication) through a unified carrier aggregation framework, improving resource utilization while managing complexity through standardized protocols.
3Productivity
If dynamic resource allocation is used to optimize network performance, then resource efficiency is improved, but control signaling overhead increases
Solution Approach 1:
The patent implements grant-free uplink transmission where the network pre-allocates uplink resources to UEs without requiring dynamic scheduling grants for each transmission. This partial action approach (providing resources without full scheduling control) reduces control signaling overhead significantly while maintaining adequate resource efficiency for predictable traffic patterns like periodic connection maintenance.
Solution Approach 2:
The network performs preliminary resource allocation and configuration in advance through RRC signaling, providing UEs with pre-configured uplink grants, periodic transmission parameters, and skipping indicators. This preliminary action eliminates the need for real-time scheduling grants, reducing control signaling overhead while maintaining resource efficiency through pre-optimized allocations.
Data Source
AI summary
A wireless device receives one or more messages. The one or messages comprise: configuration parameters for a plurality of cells comprising a licensed cell and a licensed assisted access (LAA) cell; and one or more skipping parameters indicating uplink transmission skipping is configured. A downlink control information is received indicating an uplink grant for uplink transmission of one or more packets via a first subframe of a first cell in the plurality of cells. The uplink transmission is skipped in response to: the first cell being the licensed cell; and first criteria being met. The one or more packets are transmitted in response to: the first cell being the LAA cell; and the first criteria being met.