ePDCCH Starting-Symbol Configuration for Carrier Aggregation
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Solution Overview
Problem
Existing multicarrier communication systems face challenges in efficiently managing carrier aggregation and timing alignment across multiple carriers, particularly in scenarios involving unlicensed spectrum, leading to increased load on primary component carriers and suboptimal resource utilization.
Innovation Solution
Implementing advanced timing advance group configurations and listen-before-talk (LBT) procedures to manage carrier aggregation, allowing for dynamic modulation and coding schemes, and optimizing resource allocation across synchronized and unsynchronized carriers, including unlicensed bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is implemented to increase data throughput, then network capacity and data rate are improved, but system complexity and resource management overhead increase
Solution Approach 1:
The patent segments the carrier aggregation management by introducing separate timing advance groups (TAGs) for different carriers. Each TAG can be independently configured and managed, allowing the system to handle multiple carriers without treating them as a monolithic complex structure. This segmentation enables granular control over timing alignment and resource allocation across aggregated carriers.
Solution Approach 2:
The patent introduces a new dimension of organization by grouping carriers into timing advance groups (TAGs) rather than managing each carrier individually. This dimensional change from carrier-level to group-level management simplifies the control structure while maintaining the ability to manage multiple carriers efficiently.
2Measurement precision
If multiple timing advance groups are configured for carrier aggregation, then timing alignment accuracy is improved, but signaling overhead and configuration complexity increase
Solution Approach 1:
The patent divides carriers into multiple timing advance groups (TAGs) where each group shares a common timing advance value. This segmentation allows precise timing alignment within each group while reducing the overall signaling overhead compared to configuring separate timing advances for every individual carrier.
Solution Approach 2:
Each timing advance group serves multiple carriers simultaneously, making the timing advance configuration multi-functional. A single timing advance value applied to a TAG benefits all carriers within that group, reducing redundant signaling while maintaining timing alignment accuracy for each carrier.
3Reliability
If listen-before-talk procedures are implemented in unlicensed spectrum, then fair coexistence with other technologies is improved, but access delay and reduced throughput occur
Solution Approach 1:
The patent implements dynamic carrier activation and deactivation based on LBT outcomes and traffic conditions. Carriers in unlicensed spectrum can be dynamically activated when the channel is clear and deactivated when busy, allowing the system to adapt to changing channel conditions and maintain throughput while ensuring fair coexistence.
Solution Approach 2:
The patent changes the operational state parameters of carriers based on LBT results. Carriers can be switched between active and inactive states, and timing advance configurations can be adjusted dynamically, allowing the system to optimize throughput while maintaining fair access to unlicensed spectrum resources.
4Productivity
If cross-carrier scheduling is implemented to balance load, then resource utilization is improved, but scheduling complexity and processing overhead increase
Solution Approach 1:
The patent uses timing advance groups as intermediaries for cross-carrier scheduling. By grouping carriers and managing resources at the TAG level rather than individual carrier level, the scheduling complexity is reduced while maintaining the ability to balance load across carriers effectively.
Data Source
AI summary
A wireless device may receive at least one radio resource control (RRC) message comprising a field indicating a starting symbol for an enhanced physical downlink control channel (ePDCCH). The wireless device may receive an ePDCCH signal. The ePDCCH may start from the starting symbol plus an offset value.