PSI-Based Discard State Coordination in Dual Connectivity
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Solution Overview
Problem
In dual connectivity wireless communications, network entities often make changes to the PDU set importance (PSI)-based discard procedure without coordination, leading to network congestion, conflicting instructions for the UE, and increased latency and complexity.
Innovation Solution
Network entities coordinate changes in the activation or deactivation of the PSI-based discard procedure through message exchanges, ensuring consistent state changes are communicated to the UE, thereby facilitating efficient network load balancing and reduced latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If network entities independently change PSI-based discard procedure state, then network entities can independently optimize their local performance, but network congestion occurs and instructions to UE become conflicting
Solution Approach 1:
The patent implements a feedback mechanism where network entities exchange state change notifications through message exchanges (e.g., Xn interface messages). When one network entity changes the PSI-based discard procedure state, it notifies the other network entity, which can then adjust its decisions accordingly. This feedback loop prevents conflicting instructions to the UE and avoids network congestion by ensuring coordinated state changes across the dual connectivity architecture.
2Reliability
If network entities coordinate PSI-based discard procedure changes through message exchanges, then network congestion is reduced and instruction consistency is improved, but processing complexity and latency increase
Solution Approach 1:
The patent applies preliminary action by having network entities exchange capability information in advance (e.g., during initial setup or reconfiguration phases). Each network entity declares its capabilities regarding PSI-based discard procedure control, allowing the other entity to anticipate potential state changes and prepare appropriate responses. This pre-coordination reduces the complexity of real-time message exchanges and minimizes latency during actual state changes.
3Ease of operation
If network entities implement coordinated state changes with UE, then UE processing complexity is reduced through consistent information, but message exchange overhead increases
Solution Approach 1:
The patent merges the coordination messaging between network entities with existing dual connectivity message structures. Instead of introducing entirely new separate message types, the state change notifications are integrated into existing interface protocols (e.g., combining PSI state information with regular bearer management messages). This approach provides consistent information to the UE through familiar message formats while minimizing additional message exchange overhead.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A first network entity may communicate with a user equipment (UE) via a split data radio bearer (DRB) deployment that supports a protocol data unit (PDU) set importance (PSI)-based discard procedure for dual connectivity. The first network entity may communicate, via one or more interfaces with a second network entity involved in the dual connectivity, one or more messages that include an indication of at least one state change of the PSI-based discard procedure, which may include either an activation of the PSI-based discard procedure or a deactivation of the PSI-based discard procedure. The first network entity, the second network entity, or both, may communicate an indication of the at least one state change of the PSI-based discard procedure with the UE to coordinate the state change.