Single Transmit Sharing During Handover and Dual Connectivity
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Solution Overview
Problem
Current wireless communication systems face challenges in maintaining seamless connectivity during handover operations in next-generation wireless networks, particularly in 5G NR systems, where efficient multiplexing and scheduling are needed to minimize service interruptions and adapt to changing channel conditions and traffic loads.
Innovation Solution
The implementation of time-division multiplexing (TDM) patterns that allow user equipment (UE) to maintain simultaneous connections with multiple base stations (BSs) during handover, using different TDM configurations for various phases of handover and dual connectivity operations to optimize transmission opportunities based on channel conditions and traffic loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a UE uses a single transmit path to communicate with multiple BSs during handover, then device complexity is reduced, but transmission opportunities are limited due to inability to simultaneously transmit to multiple BSs
Solution Approach 1:
The patent implements time-division multiplexing where the UE alternates between transmitting to the first BS and the second BS in periodic time slots. The TDM pattern configures specific time resources for each BS, allowing the single transmit path to serve multiple BSs sequentially rather than simultaneously, thus resolving the contradiction between device complexity and transmission opportunities.
2Adaptability or versatility
If the UE switches transmit path configuration during handover, then transmission flexibility is improved, but interruption time increases
Solution Approach 1:
The patent pre-configures multiple TDM patterns in advance, with a first TDM pattern for initial handover and a second TDM pattern for subsequent communication. By having these patterns prepared beforehand and switching between them based on handover phase, the system achieves configuration flexibility while minimizing the time required for reconfiguration during actual handover execution.
3Reliability
If the UE maintains simultaneous connections to source and target BSs, then connection reliability is improved, but scheduling complexity increases
Solution Approach 1:
The patent segments the communication resources by creating distinct TDM patterns that allocate specific time slots for communication with the source BS and specific time slots for communication with the target BS. This segmentation of time resources simplifies the scheduling complexity by providing clear, predetermined allocation rules while maintaining simultaneous connections to both BSs, thus improving reliability without excessive complexity.
Data Source
AI summary
Wireless communications systems and methods related to communications in a wireless network during handover and/or dual connectivity operations are provided. A user equipment (UE) transmits, to a first base station (BS), a first communication signal based on a first time-division multiplexed (TDM) configuration. The UE transmits, to a second BS different from the first BS, a second communication signal, the second communication signal being multiplexed with the first communication signal based on the first TDM configuration. The UE transmits, to the first BS, a third communication signal based on a second TDM configuration different from the first TDM configuration. The first TDM configuration and the second TDM configuration are associated with a handover from the first BS to the second BS. The UE transmits, to the second BS, a fourth communication signal, the fourth communication signal being multiplexed with the third communication signal based on the second TDM configuration.