Power Headroom Report Segmentation in Dual Connectivity Terminals
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Solution Overview
Problem
In wireless communication systems with dual connectivity, there is a lack of efficient methods for a terminal to transmit Power Headroom Reports (PHR) to serving cells in Master Cell Groups (MCG) and Secondary Cell Groups (SCG), particularly in scenarios where scheduling information is not dynamically shared among cells at different geographic locations.
Innovation Solution
A method and apparatus for efficiently transmitting PHR in a wireless communication system with dual connectivity, where a terminal triggers and transmits PHR to a serving cell in the MCG based on specific triggering conditions, using either virtual or actual PH information, and includes configuring PHR to include virtual PH information under certain conditions to satisfy PHR triggering conditions even without secured uplink resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal transmits PHR to both MCG and SCG in dual connectivity, then power management coverage is improved, but transmission complexity and overhead increase
Solution Approach 1:
The PHR transmission is segmented into two independent processes: one for MCG (Master Cell Group) and one for SCG (Secondary Cell Group). Each cell group has its own triggering conditions, timing, and transmission procedures, allowing the terminal to manage power headroom information separately for each connection without overwhelming complexity.
Solution Approach 2:
The patent implements dynamic triggering mechanisms where PHR transmission is activated based on real-time conditions such as pathloss changes, power backoff adjustments, or scheduling decisions. The terminal can dynamically decide whether to transmit PHR to MCG, SCG, or both, based on current network conditions and power availability.
2Reliability
If virtual PH information is used when uplink resources are not secured, then PHR triggering reliability is improved, but measurement precision decreases
Solution Approach 1:
The terminal performs preliminary calculations of virtual PH information based on assumed or estimated uplink transmission parameters before actual transmission occurs. This allows the PHR to be triggered and transmitted even when uplink resources are not yet secured, providing the base station with advance power management information.
Solution Approach 2:
Virtual PH information is created as a copy or estimation of the actual PH information that would be measured during real uplink transmission. This copied data follows the same format and structure as actual PH measurements, allowing it to be processed by the base station while acknowledging it represents an estimation rather than a direct measurement.
3Adaptability or versatility
If PHR triggering conditions are relaxed to include virtual PH scenarios, then adaptability is improved, but device complexity increases
Solution Approach 1:
The PHR transmission mechanism is designed to be universal, handling multiple scenarios through a single framework: actual PH transmission when uplink resources are available, virtual PH transmission when resources are not available, and selective transmission to MCG/SCG based on dual connectivity status. This multi-functionality increases adaptability without proportionally increasing complexity.
Data Source
AI summary
One disclosure of the present specification provides a method for receiving downlink data in a wireless communication system supporting 256 QAM. The method for receiving downlink data in a wireless communication system supporting 256 QAM comprises the steps of: receiving configuration information about power back-off; receiving downlink data transmitted on the basis of the configuration information about power back-off; and demodulating the received downlink data on the basis of the configuration information about power back-off, wherein the configuration information about power back-off may comprise information related to at least one of the following: whether to apply power back-off, the reduced amount of power of downlink data by power back-off, a frame index to which power back-off is applied, a subframe index and a resource to which power back-off is applied.