UE DRX Handling for MBS Multicast in RRC Inactive State
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Solution Overview
Problem
Current 5G mobile communication systems lack a robust and efficient Discontinuous Reception (DRX) mechanism for User Equipment (UEs) to receive multicast services in the RRC_INACTIVE state, leading to inefficiencies and power consumption issues due to the limitations of existing DRX configurations designed for RRC_CONNECTED state only.
Innovation Solution
A method and apparatus for handling DRX operation in UEs to enable multicast service reception in RRC_INACTIVE state, involving DRX configuration, modification, and release based on specific events, such as RRC state transitions and multicast session activation/deactivation, to optimize power saving and reception continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If DRX configuration is designed for RRC_CONNECTED state only, then existing DRX mechanisms can operate reliably in connected state, but UEs cannot efficiently receive multicast services in RRC_INACTIVE state leading to increased power consumption
Solution Approach 1:
The patent applies dynamics by making the DRX configuration state-dependent. The network configures separate DRX parameters for RRC_CONNECTED and RRC_INACTIVE states, allowing the UE to dynamically switch between different DRX behaviors based on its current RRC state. This enables efficient power management in INACTIVE state while maintaining reliable operation in CONNECTED state, directly resolving the technical contradiction between adaptability and power consumption.
Solution Approach 2:
The patent implements parameter changes by introducing state-specific DRX configuration parameters. When the UE transitions between RRC states, the applicable DRX parameters change accordingly - using connected-state parameters when connected and inactive-state parameters when inactive. This parameter differentiation allows the system to optimize power consumption for each state while maintaining overall reliability.
2Loss of energy
If DRX operation is extended to RRC_INACTIVE state for multicast reception, then power saving can be improved, but reliability of multicast service reception may deteriorate due to lack of robust configuration mechanisms
Solution Approach 1:
The patent applies preliminary action by having the network pre-configure DRX parameters for RRC_INACTIVE state before the UE actually enters that state. The network provides the inactive-state DRX configuration in advance (e.g., via RRC Release message), so when the UE transitions to INACTIVE state, it can immediately apply the pre-prepared configuration without interruption to multicast reception. This ensures both power saving and reliability are maintained.
Solution Approach 2:
The patent implements beforehand cushioning by preparing fallback mechanisms and robust configuration procedures for DRX operation in RRC_INACTIVE state. The network ensures that DRX configurations are carefully designed to handle potential issues in inactive state, providing a cushion against reliability problems that might arise from the less controlled INACTIVE environment compared to CONNECTED state.
3Reliability
If DRX configuration is frequently modified based on UE events and state transitions, then reception continuity can be maintained, but device complexity increases due to multiple configuration states
Solution Approach 1:
The patent applies segmentation by dividing the DRX configuration into distinct segments for different RRC states. Instead of having one complex configuration that must handle all states, the system separates DRX parameters into connected-state parameters and inactive-state parameters. This segmentation simplifies the management logic - the UE only needs to apply the appropriate segment based on its current state, reducing overall complexity while maintaining reception continuity.
Solution Approach 2:
The patent implements universality by designing a unified DRX configuration framework that serves multiple RRC states. The same basic DRX configuration structure and mechanism are used for both RRC_CONNECTED and RRC_INACTIVE states, with state-specific parameter values. This multi-functional approach reduces complexity compared to having entirely separate mechanisms for each state, while still enabling reception continuity across state transitions.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. Embodiments herein disclose methods and UE for handling DRX operation for MBS multicast reception in wireless network. Embodiments herein disclose methods for handling a DRX operation for MBS multicast reception in a wireless network (1000) by a UE (100). The method includes receiving the DRX configuration for at least one MRB for the multicast session reception to be received in a RRC inactive state. Further, the method includes detecting at least one event, where the UE is in the RRC inactive state. Further, the method includes handling the DRX operation for the multicast session reception in the RRC inactive state in the wireless network (1000) upon detecting the at least one event. The method can be used for handling the DRX operation for the MBS multicast reception in the RRC_INACTIVE state in the wireless network (1000) in an efficient, reliable and robust manner.