Logical Channel Configuration for 5G Small Data Transmission
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Solution Overview
Problem
In 5G NR systems, transitioning to the RRC_CONNECTED state for small data transmissions in the RRC_INACTIVE state results in unnecessary power consumption and signaling overhead, as existing SDT mechanisms do not efficiently support small data transmission without state transitions.
Innovation Solution
Implementing a method for logical channel configuration in small data transmission (SDT) that includes receiving an RRC release message with specific configurations, transitioning to RRC_INACTIVE, and applying LCH restriction parameters for Logical Channel Prioritization (LCP) during SDT procedures, utilizing both RA-based and CG-based SDT methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE transitions to RRC_CONNECTED state for small data transmissions, then data transmission can be performed, but power consumption and signaling overhead increase
Solution Approach 1:
The patent segments the data transmission process by introducing SDT-specific logical channels that operate independently within the RRC_INACTIVE state. This allows small data transmissions to be handled separately without requiring full connection establishment, thereby reducing power consumption while maintaining transmission capability.
Solution Approach 2:
The patent applies preliminary action by pre-configuring SDT-specific logical channel parameters and restrictions before the UE needs to transmit data. The network configures these parameters in advance, allowing the UE to immediately perform small data transmissions in RRC_INACTIVE state without transitioning to RRC_CONNECTED, thus avoiding unnecessary power consumption.
2Productivity
If the UE transitions to RRC_CONNECTED state for small data transmissions, then data transmission can be performed, but signaling overhead increases
Solution Approach 1:
The patent extracts the essential data transmission functionality from the full RRC connection establishment process. By creating SDT-specific logical channels that can operate independently in RRC_INACTIVE state, the patent removes the need for extensive signaling required for full connection setup, thereby reducing signaling overhead while maintaining data transmission capability.
Solution Approach 2:
The network performs preliminary configuration of SDT-specific logical channel parameters, mapping relationships, and restrictions before the UE needs to transmit data. This advance configuration eliminates the need for real-time signaling during small data transmissions, significantly reducing signaling overhead.
3Productivity
If SDT-specific LCH configuration is implemented, then small data transmission efficiency improves, but configuration complexity increases
Solution Approach 1:
The patent applies local quality by introducing SDT-specific logical channel parameters that are tailored specifically for small data transmission requirements. These localized configurations (such as sd lch-MaxPUSCH-Duration, sd lch-allowedCG-List) are applied only to SDT operations rather than all data transmissions, improving efficiency without requiring complete reconfiguration of the system.
Solution Approach 2:
The patent implements dynamic configuration where the network can flexibly adjust SDT-specific logical channel parameters based on actual transmission needs. The configuration includes dynamic elements such as allowedCG-List that can be adjusted to permit or restrict specific configured grants, allowing the system to adapt to varying small data transmission requirements without fixed rigid structures.
Data Source
AI summary
A method and a user equipment (UE) for logical channel (LCH) configuration in small data transmission (SDT) are provided. The method includes: receiving, from a base station (BS), a radio resource control (RRC) release message; determining whether the RRC release message includes a specific configuration, the specific configuration including an SDT configuration and an SDT-specific LCH configuration; transitioning to an RRC_INACTIVE state after determining that the RRC release message includes the specific configuration; initiating an SDT procedure based on the SDT configuration when the UE is in the RRC_INACTIVE state; and applying at least one LCH restriction parameter included in the SDT-specific LCH configuration for a Logical Channel Prioritization (LCP) procedure during the SDT procedure.