Uplink Time-Division Multiplexing for Make-Before-Break Handover
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing uplink communications during make-before-break handover procedures, particularly in ensuring minimal interruption and latency.
Innovation Solution
The method involves determining a prioritization rule for uplink communications and using time-division multiplexing (TDM) to transmit these communications between a user equipment (UE) and multiple base stations during a make-before-break handover, ensuring that higher priority communications are transmitted first.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time-division multiplexing is used to transmit uplink communications to multiple base stations during handover, then communication continuity is improved, but transmission complexity increases
Solution Approach 1:
The patent segments uplink communications into different time slots for transmission to source and target base stations. The UE divides its transmission resources temporally, assigning specific time periods for communicating with each base station during handover, thereby managing complexity through structured time division while maintaining continuous communication.
Solution Approach 2:
The patent implements dynamic prioritization rules that adapt during the handover process. The UE and base stations dynamically adjust transmission priorities based on handover phase, signal conditions, and communication requirements, allowing the system to optimize performance while managing complexity through flexible, condition-based decision making.
2Loss of time
If prioritization rules are implemented for uplink communications, then latency is reduced, but scheduling complexity increases
Solution Approach 1:
The patent establishes prioritization rules in advance before handover begins. The UE and base stations pre-configure transmission priorities for different uplink communications, so that when handover occurs, transmissions can proceed immediately according to predetermined rules without requiring complex real-time scheduling decisions.
Solution Approach 2:
The patent changes the parameter of transmission priority based on communication type and handover phase. Different uplink communications (e.g., control signals vs. data) are assigned different priority levels, and these priorities are adjusted according to the handover state, enabling low-latency transmission without requiring complex adaptive scheduling algorithms.
3Reliability
If uplink communications are transmitted to both source and target base stations simultaneously, then handover interruption is minimized, but resource conflicts increase
Solution Approach 1:
The patent uses periodic time-division multiplexing where the UE alternates between transmitting to the source base station and the target base station in regular time slots. This periodic switching pattern allows simultaneous communication with both base stations while preventing resource conflicts through structured temporal separation of transmissions.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a message indicating that the UE is to execute a make-before-break handover procedure. The UE may transmit, during the make-before-break handover procedure and based at least in part on a prioritization rule, a first uplink communication to a target base station. The prioritization rule may indicate a relative priority for different uplink communications included in a group of uplink communications. The group of uplink communications may include at least the first uplink communication to be transmitted by the UE to the target base station and a second uplink communication to be transmitted by the UE to a source base station during the make-before-break handover procedure. Numerous other aspects are described.