Enhanced Measurement Report for Conditional Handover
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Solution Overview
Problem
Current handover procedures in wireless communication networks, such as 3GPP LTE and 5G NR, lack sufficient information about radio link status, making it difficult for networks to determine the urgency and type of handover, especially in conditional handover scenarios where radio conditions cannot be predicted in advance.
Innovation Solution
Incorporating additional information elements in measurement reports transmitted from client nodes to source network nodes, detailing the radio link status, including timers, out-of-sync indications, beam failures, and scheduling requests, allows the network to make informed decisions about handover type and urgency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If measurement reports include additional radio link status information elements, then the network can make more informed handover decisions, but the signaling overhead and message size increase
Solution Approach 1:
The patent extracts only the most critical radio link status information elements (such as out-of-sync indication counters, beam failure indicators, and scheduling request statuses) from the complete set of possible measurements. This selective extraction approach provides sufficient decision-making information for the network while minimizing the increase in measurement report size and signaling overhead.
2Reliability
If the client node monitors multiple radio link conditions, then the network gains better visibility into link health, but the device complexity and processing load increase
Solution Approach 1:
The patent implements differentiated monitoring where the client node focuses on specific critical radio link parameters (such as out-of-sync indications from physical layer, beam failure detection, and scheduling request outcomes) rather than uniformly monitoring all possible radio conditions. This localized quality approach provides the network with essential link health visibility while keeping the client node's monitoring complexity manageable.
3Reliability
If conditional handover is used to wait for optimal conditions, then handover success rate improves, but the handover execution is delayed
Solution Approach 1:
The patent enables preliminary identification of suitable target cells by having the network configure measurement objects and reporting criteria in advance. The client node continuously monitors radio link status and prepares measurement reports with radio link information elements that allow the network to pre-identify and pre-configure handover targets, reducing the actual execution delay when handover becomes necessary.
Solution Approach 2:
The patent implements a feedback mechanism where the client node reports radio link status information elements (such as out-of-sync counter values and beam failure indicators) to the network. The network uses this feedback to dynamically adjust handover timing decisions, balancing the trade-off between waiting for optimal conditions and executing handover timely to prevent radio link failure.
Data Source
AI summary
Various example embodiments relate to signaling and execution of a handover based on an enhanced measurement report. A measurement report comprising an additional information element may be used by a network to make better and urgent decisions concerning handover procedures. Apparatuses, methods, and computer programs are disclosed.