RRC Inactive Uplink Transmission Using Configured Grant Mapping
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Solution Overview
Problem
Existing wireless communication systems, particularly in 5G NR, face challenges in optimizing UL transmissions in the RRC_INACTIVE state, as current protocols require transitioning to RRC_CONNECTED state for data transmission, leading to inefficiencies and increased latency.
Innovation Solution
A method and UE implementation that allows UL data transmission in RRC_INACTIVE state by receiving RRC release messages with CG configurations, determining data availability, and transmitting through PUSCHs based on CG associations, while managing LCP restrictions and releasing configurations under certain conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transitions to RRC_CONNECTED state for UL data transmission, then the transmission reliability is improved, but the transmission latency increases and resource utilization efficiency deteriorates
Solution Approach 1:
The network configures CG resources and LCH mappings in advance while the UE is in RRC_INACTIVE state. The configuration includes multiple CG configurations with different LCH associations, preparing the UE to immediately transmit data when available without state transition delays
Solution Approach 2:
The patent extracts the data transmission function from the RRC state transition requirement. By allowing UL transmission on pre-configured CG resources in RRC_INACTIVE state, the essential transmission function is separated from the connected state dependency, reducing latency while maintaining reliability through configured grant mechanisms
2Manufacturing precision
If the UE transitions to RRC_CONNECTED state for UL data transmission, then the resource allocation accuracy is improved, but the resource utilization efficiency deteriorates
Solution Approach 1:
The network performs preliminary resource configuration by setting up multiple CG configurations with specific LCH associations before the UE enters RRC_INACTIVE state. This advance preparation ensures accurate resource allocation is ready when needed, eliminating the need for real-time state transitions
Solution Approach 2:
The patent introduces dynamic CG configuration management where the network can configure multiple CG resources with different LCH mappings. The UE dynamically selects appropriate CG resources based on data availability and configuration associations, optimizing resource utilization without requiring connected state transitions
3Adaptability or versatility
If multiple CG configurations are associated with the same LCH, then the transmission flexibility is improved, but the configuration complexity increases
Solution Approach 1:
The patent segments the CG configuration into multiple independent configurations, each with specific LCH associations. This segmentation allows flexible combination of CG resources for different data types while keeping each configuration unit manageable and clearly defined
Solution Approach 2:
The LCH configuration acts as an intermediary that links multiple CG configurations to logical channels. This intermediary structure provides a clear mapping relationship that simplifies the complexity management by establishing explicit association rules between CG resources and data streams
Data Source
AI summary
A wireless communication method includes receiving, in an RRC_CONNECTED state, an RRC release message including first information and second information, the first information including at least one LCP restriction, the second information including one or more CG configurations; transitioning from the RRC_CONNECTED state to the RRC_INACTIVE state in response to the RRC release message; determining that data from an LCH corresponding to the at least one LCP restriction becomes available for UL transmission; determining whether to transmit the data in the RRC_INACTIVE state according to whether any of the one or more CG configurations meets the at least one LCP mapping restriction; and in a case that a CG configuration of the one or more CG configurations meets the at least one LCP mapping restriction, transmitting the data through a set of PUSCHs determined by the CG configuration of the one or more CG configurations.