Dual-Connectivity Power Headroom Report Triggering Mechanism
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Solution Overview
Problem
There is a lack of a triggering and sending mechanism for Power Headroom Reports (PHR) in dual-connectivity terminals, particularly in scenarios involving multiple network nodes with differing wireless environments, which affects timely feedback and uplink scheduling in LTE systems.
Innovation Solution
A method and device for reporting PHR, where a terminal detects the addition of a first cell in a SeNB and configures a reporting format to report type2 and type1 PHRs to both MeNB and SeNB, ensuring simultaneous PUCCH and PUSCH sending capabilities are accounted for, with PHRs arranged according to cell identifiers from small to large.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a terminal uses dual-connectivity to connect with multiple network nodes (MeNB and SeNB) to enhance user throughput and coverage, then the adaptability and coverage are improved, but the complexity of PHR triggering and sending mechanisms increases because there is no established mechanism for reporting PHR across multiple base stations with different wireless environments
Solution Approach 1:
The PHR reporting mechanism is segmented into cell-specific triggering conditions and cell-specific reporting procedures. Each serving cell (Pcell, Scell1, Scell2) has its own PHR triggering and sending path, allowing independent control and simplifying the overall complex mechanism by dividing it into manageable cell-level units.
Solution Approach 2:
The patent introduces an intermediary mechanism where the terminal determines whether to send PHR to MeNB or SeNB based on cell-specific configurations and triggering conditions. This intermediary decision-making process simplifies the complex multi-node reporting by establishing clear routing rules for PHR messages in dual-connectivity scenarios.
2Loss of information
If the terminal reports PHR for all activated cells simultaneously to ensure complete power status feedback, then the completeness of information is improved, but the loss of time increases due to the extensive triggering and sending procedure required across multiple cells and network nodes
Solution Approach 1:
The system performs preliminary configuration of PHR parameters, thresholds, and reporting rules for each cell before actual PHR triggering occurs. This preliminary setup enables faster real-time PHR reporting by having all necessary decision-making criteria pre-established, reducing the time required for actual PHR triggering and sending while ensuring complete information coverage.
Solution Approach 2:
The patent implements periodic PHR reporting mechanisms with configured timers and thresholds for each cell. Instead of continuous monitoring and reporting, the system uses periodic checks based on path loss changes, power back-off thresholds, and timer expirations, which reduces time loss while maintaining information completeness through structured periodic updates.
3Adaptability or versatility
If the system adds more Scells (e.g., up to 4) to handle increased data volume and expand scenarios like uplink RRH and repeater support, then the adaptability and scenario coverage are improved, but the device complexity increases because the reporting format must accommodate multiple cells with different PUCCH/PUSCH configurations
Solution Approach 1:
The patent creates a universal PHR reporting format that can handle multiple cell types (Pcell, Scell with PUCCH, Scell without PUCCH) and different transmission scenarios (PUCCH only, PUSCH only, both) through a unified structure. This universal format uses cell identifiers and type indicators to accommodate up to 4 Scells and various dual-connectivity configurations without requiring separate reporting mechanisms for each scenario.
Data Source
AI summary
The embodiments of the present document provide a method and device for reporting a power headroom report, which relates to the field of mobile communications, and solves the problem of lacking a triggering and sending mechanism for a PHR of the dual-connectivity terminal in the related art. The method includes: a terminal triggering to report a PHR when detecting that a first cell is added in a SeNB; and the terminal reporting the PHR to a MeNB and/or the SeNB, to which the terminal belongs. The technical scheme provided in the embodiments of the present document is applicable to a long term evolution system, which implements the PHR reporting of the dual-connectivity terminal.