Dual Active Protocol Stack Handover with Full-Duplex

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Solution Overview

Problem

Current wireless communication systems face challenges in seamless handovers, particularly in supporting dual active protocol stack (DAPS) and full-duplex operations, which can lead to communication disruptions and inefficiencies during handover transitions.

Innovation Solution

Implementing a method where user equipment (UE) and base stations exchange indications of DAPS-based handover and full-duplex capability, enabling simultaneous communication with both source and target cells during the handover process, utilizing full-duplex operations to reduce latency and increase spectral efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional handover procedures are used, then handover completion is achieved, but communication disruptions and latency occur during handover transitions

Engineering Contradiction:

Improvehandover seamlessVSAvoidhandover latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The UE establishes uplink connection with the target cell before releasing the downlink connection with the source cell. This preliminary action of setting up the uplink path first allows the handover to proceed without interrupting downlink data reception, thereby reducing handover latency while maintaining seamless communication.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent maintains continuous downlink communication with the source cell during the handover transition by keeping the downlink connection active until the uplink connection with the target cell is fully established. This continuity ensures no interruption in useful communication actions during the handover process.

Inventive Principle:

Principle #20Continuity of useful action

2Productivity

If dual active protocol stack and full-duplex operation are implemented, then spectral efficiency increases, but device complexity increases

Engineering Contradiction:

Improvespectral efficiencyVSAvoidprotocol stack complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent segments the protocol stack into separate uplink and downlink protocol stacks, allowing independent management and activation of each stack. This segmentation enables the UE to maintain dual active protocol stacks without overwhelming complexity, as each stack can be handled separately with dedicated resources and processing paths.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements dynamic switching between different protocol stack configurations and full-duplex operation modes. The system can adaptively activate or deactivate full-duplex mode and adjust protocol stack activation based on network conditions and handover requirements, managing complexity through dynamic control rather than static configuration.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS11812315B2Handovers using dual active protocol stack and full-duplex operation

Publication Date: 2023.11.07 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit, to a base station, an indication that the UE supports dual active protocol stack (DAPS) based handover capability and full-duplex operation capability. The UE may perform a full-duplex based DAPS handover based at least in part on the indication. Numerous other aspects are provided.