Logical Channel Mapping for Grant-Free Transmission
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Solution Overview
Problem
Current multicarrier communication systems face challenges in efficiently managing signal timing and resource allocation across multiple carriers, leading to suboptimal performance in carrier aggregation and interworking between different radio access technologies.
Innovation Solution
The implementation of advanced signal processing techniques, such as OFDM and dynamic modulation and coding schemes, along with carrier aggregation and dual connectivity mechanisms, enables efficient signal timing and resource allocation across multiple carriers, optimizing performance in multicarrier systems and interworking between 5G and LTE networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple carriers are aggregated to increase system capacity, then network throughput and reliability are improved, but signal timing alignment and resource allocation complexity increase
Solution Approach 1:
The patent segments the timing alignment problem by introducing separate timing advance groups (TAGs) that can independently manage timing for different carrier groups. This allows the system to handle multiple carriers by dividing them into manageable segments with independent timing control, reducing the overall complexity of multi-carrier timing alignment.
Solution Approach 2:
The patent introduces a new dimension of control by adding group-based timing advance mechanisms. Instead of managing timing for each carrier individually, the system organizes carriers into groups with group-specific timing advances, adding a hierarchical layer to the timing management structure that simplifies the control of multiple carriers.
2Productivity
If dynamic modulation and coding schemes are implemented to optimize resource allocation, then spectral efficiency is improved, but processing complexity and computational requirements increase
Solution Approach 1:
The patent implements dynamic modulation and coding schemes that can adaptively change parameters based on channel conditions. The system dynamically selects from a set of pre-defined modulation and coding configurations, allowing it to optimize spectral efficiency while managing processing complexity through structured adaptation rather than exhaustive optimization.
Solution Approach 2:
The patent changes key parameters such as modulation order, coding rate, and resource block allocation dynamically based on channel quality indicators. By systematically varying these parameters within predefined ranges and relationships, the system achieves optimized spectral efficiency while keeping processing requirements manageable through parameter-based control rather than full re-optimization.
3Productivity
If carrier aggregation is used to enhance network performance, then data throughput is improved, but interworking complexity between different radio access technologies increases
Solution Approach 1:
The patent creates a universal timing management framework that can handle multiple radio access technologies (LTE and NR) through common group-based timing advance mechanisms. This multi-functional approach allows the same timing management structure to serve both LTE and NR carriers, reducing interworking complexity while maintaining enhanced data throughput through carrier aggregation.
Solution Approach 2:
The patent introduces group-based timing advance groups as an intermediary layer between the physical layer and higher-layer protocols. This intermediary structure simplifies interworking between different radio access technologies by providing a unified interface for timing management, thereby reducing the complexity of coordinating multiple technologies while maintaining high data throughput.
Data Source
AI summary
A wireless device receives RRC message(s) comprising: parameter(s) indicating whether a configured periodic grant of a first type can be used for transmission of data of a first logical channel; a timing offset and a symbol number identifying a resource of an uplink grant of the configured periodic grant of the type; and a first periodicity of the configured periodic grant. The first periodicity indicates a time interval between two subsequent resources of the configured periodic grant. The configured periodic grant is activated in response to receiving the RRC message(s). The data of the logical channel is multiplexed onto transport block(s) for transmission via the resource in response to the parameter(s) indicating that the configured periodic grant can be used by the logical channel. The transport block(s) are transmitted via the resource of the configured periodic grant.