Power Headroom Reporting in Multi-Cell LTE Terminals
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Solution Overview
Problem
Current radio communication systems, particularly in LTE, lack an efficient method for processing transmit power in terminal devices when dealing with multiple serving cells, including primary and secondary cells, which affects power headroom reporting and resource allocation.
Innovation Solution
A terminal device and base station device configuration that includes a reception unit, MAC processing unit, and transmission unit to receive and transmit parameters for power headroom reporting, allowing for efficient processing and reporting of type 2 power headroom values for both primary and secondary cells, enabling effective power management and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a terminal device performs simultaneous transmissions and/or receptions in more than five serving cells (component carriers), then the device can achieve higher data rates and network capacity, but the complexity of power headroom reporting and transmit power processing increases significantly
Solution Approach 1:
The patent segments the power headroom reporting by introducing separate MAC control elements for different cell types (PCell and SCell). Type 2 PH MAC CE is used for SCells while Type 1 PH MAC CE is used for PCell, allowing independent processing and reporting of power headroom for each cell category, thereby managing the complexity of multi-cell power reporting.
Solution Approach 2:
The patent introduces a new dimension to power headroom reporting by defining Type 2 PH specifically for SCells with PUCCH configuration. This adds a classification layer to the existing Type 1 PH (for PCell), creating a two-dimensional reporting structure that accommodates the increased complexity of carrier aggregation beyond 5 cells.
2Adaptability or versatility
If a terminal device transmits power headroom reports for multiple serving cells, then the network can optimize resource allocation, but the processing overhead and signaling complexity increase
Solution Approach 1:
The patent segments power headroom reporting into cell-specific MAC control elements. Each SCell with PUCCH configuration has its own Type 2 PH MAC CE, and the PCell has Type 1 PH MAC CE. This segmentation allows the network to process power headroom information for each cell independently, optimizing resource allocation while managing processing overhead through structured reporting.
3Adaptability or versatility
If the terminal device configures PUCCH on SCell, then uplink control flexibility is improved, but the power management and headroom reporting become more complex
Solution Approach 1:
The patent applies local quality by introducing Type 2 PH MAC CE specifically for SCells that have PUCCH configuration, while keeping Type 1 PH MAC CE for PCell. This localized approach allows differentiated power headroom reporting for cells with different PUCCH configurations, improving uplink control flexibility while managing power management complexity through cell-specific processing.
Data Source
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AI summary
Processing relating to transmit power is efficiently performed. A terminal device includes a reception unit configured to receive a first parameter and a second parameter, and a first MAC processing unit configured to acquire a type 2 power headroom. The first MAC processing unit acquires a value of the type 2 power headroom for a primary cell, in a case that the first parameter is configured and that simultaneous transmissions on a Physical Uplink Control CHannel (PUCCH) and on a Physical Uplink Shared CHannel (PUSCH) are configured, and acquires a value of the type 2 power headroom for the primary cell, regardless of whether simultaneous transmissions on the Physical Uplink Control CHannel (PUCCH) and on the Physical Uplink Shared CHannel (PUSCH) are configured in a case that the second parameter is configured.