MAC CE Beam Measurement Restriction for NR Latency
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Solution Overview
Problem
The traditional handover procedure in NR Release 15 for UE moving across multiple cells involves beam or cell measurement and reporting, leading to increased latency and signaling overhead, with limited flexibility in resource measurement restriction, particularly due to interference management and network optimization requirements.
Innovation Solution
The method involves using MAC Control Elements (CE) to activate or deactivate resources for channel measurement, determining CSI Reporting settings and bitmaps to indicate the activation or deactivation status of resources, allowing for more flexible beam measurement and reporting by restricting unnecessary resource measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RRC layer measurement restriction is used, then resource measurement can be restricted, but latency increases and flexibility decreases
Solution Approach 1:
The patent segments the measurement restriction control into two layers: RRC layer for configuring available resources and MAC layer for activating/deactivating specific resources. This segmentation allows flexible resource management while maintaining lower latency through MAC CE-based control, resolving the contradiction between adaptability and time loss.
Solution Approach 2:
The patent introduces MAC CE as an intermediary between RRC configuration and actual measurement execution. The MAC CE provides dynamic activation/deactivation of measurement resources without requiring full RRC reconfiguration, enabling flexible resource restriction with reduced latency compared to pure RRC-based approaches.
2Reliability
If all configured resources are measured, then measurement completeness is maintained, but signaling overhead increases
Solution Approach 1:
The patent extracts only the necessary measurement resources from the full configured set by using MAC CE activation/deactivation bits. Instead of measuring all configured resources, the system selectively activates only those resources that need to be measured and reported, reducing signaling overhead while maintaining measurement completeness for relevant resources.
Solution Approach 2:
The patent implements partial measurement action by allowing the network to activate only a subset of configured measurement resources via MAC CE. This partial action approach measures only the necessary resources rather than all configured resources, reducing uplink signaling overhead for CSI reports while maintaining reliability for activated resources.
3Productivity
If MAC CE based measurement restriction is implemented, then flexibility and latency are improved, but device complexity increases
Solution Approach 1:
The patent changes the control parameter from full RRC reconfiguration to MAC CE activation/deactivation bits. This parameter change enables more efficient resource management with lower latency while the standardized MAC CE format and bitmapping schemes keep the processing complexity manageable through structured data representation.
Data Source
AI summary
Methods and apparatuses for resource measurement restriction for beam management are disclosed. A method comprises receiving a MAC CE to activate or deactivate resource (s) configured for the UE for channel measurement; and determining CRI or SSBRI values that are not allowed to be reported in a CSI report according to the resource (s) deactivated by the MAC CE.