RRC Inactive UE Multicast Continuity Across Cells Using PDCP Sync
Solution Overview
Problem
Existing wireless networking technologies face challenges in providing multicast service continuity for user equipment (UE) in radio resource control (RRC) inactive state due to uncertainties in PDCP counter synchronization and LCID mapping during mobility, leading to potential packet loss and service disruption.
Innovation Solution
The UE receives an indication of PDCP counter synchronization and LCID mapping across multiple network nodes, allowing it to continue receiving the multicast service without performing PDCP re-establishment or initialization, thereby maintaining PDCP variable continuity and ensuring seamless service continuity during cell transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs PDCP re-establishment or initialization during cell transitions, then service continuity can be ensured through proper state resetting, but packet loss occurs and service disruption happens due to loss of PDCP variable continuity
Solution Approach 1:
The network node provides preliminary indication information about PDCP counter synchronization and LCID mapping relationships before the UE performs cell transitions. This allows the UE to prepare appropriate PDCP configurations in advance, avoiding packet loss during handover by pre-establishing the correct PDCP variable continuity status.
Solution Approach 2:
The patent implements dynamic adaptation of PDCP configuration based on received indication information. The UE can dynamically determine whether to perform PDCP re-establishment or maintain PDCP variable continuity by evaluating the PDCP counter synchronization status and LCID mapping relationships, optimizing service continuity while minimizing packet loss.
2Loss of substance
If the UE maintains PDCP variable continuity without re-establishment during cell transitions, then packet loss is minimized and service continuity is improved, but uncertainty in PDCP counter synchronization and LCID mapping may lead to service disruption
Solution Approach 1:
The network node provides feedback information in the form of indication messages containing PDCP counter synchronization status and LCID mapping relationships. The UE uses this feedback to accurately determine the appropriate PDCP configuration strategy, eliminating uncertainty and ensuring reliable service continuity while maintaining PDCP variable continuity.
Solution Approach 2:
The patent changes the operational parameters of PDCP by introducing indication information that specifies PDCP counter synchronization status and LCID mapping relationships. Based on these parameter changes, the UE adjusts its PDCP configuration dynamically, ensuring both minimal packet loss and reliable service continuity.
3Reliability
If the UE receives detailed PDCP configuration information from the network, then accurate PDCP variable continuity can be maintained, but device complexity increases due to additional processing requirements
Solution Approach 1:
The patent extracts only the essential information needed for PDCP configuration maintenance - specifically PDCP counter synchronization status and LCID mapping relationships - from the network node. By taking out only these critical parameters rather than full configuration details, the UE can maintain accurate PDCP variable continuity with minimal additional processing complexity.
Data Source
AI summary
Apparatus and methods for multicast service continuity for radio resource control (RRC) user equipment apparatuses (UEs) in mobility are disclosed. In an aspect, a UE receives, from a first network node of a first cell, a multicast service while operating in an RRC inactive state or an RRC idle state in the first cell. The UE further receives an indication of a packet data convergence protocol (PDCP) counter synchronization across multiple network nodes for the multicast service, where the multiple network nodes include the first network node. The UE further selects a second cell for camping. The UE further continues to receive, based on a PDCP variable continuity, the multicast service in the second cell from a second network node of the second cell, where the multiple network nodes include the second network node, and where the PDCP variable continuity is responsive to the indication of the PDCP counter synchronization.