Power Headroom Report Type Selection for PUCCH Transmission
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Solution Overview
Problem
In the LTE system, determining the power headroom for reporting to the base station is a key challenge, as it affects the configuration of serving cells and Hybrid Automatic Retransmission Request—Acknowledgement (HARQ-ACK) binding, and existing methods lack precision in determining power usage for Physical Uplink Control Channel (PUCCH) transmission.
Innovation Solution
A method and device for reporting Power Headroom Reports (PHR) that determine the type of PHR based on the type of PUCCH to be transmitted, allowing for accurate power headroom calculation and reporting, enabling better configuration of serving cells and HARQ-ACK binding by the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing power headroom determination methods are used in LTE system, then the base station can obtain power headroom information, but the precision of power usage determination for PUCCH transmission is insufficient
Solution Approach 1:
The patent segments the power headroom reporting mechanism by introducing different PHR types (Type 1 and Type 2) corresponding to different PUCCH transmission scenarios. Type 1 PHR is used when PUSCH and PUCCH are transmitted simultaneously, while Type 2 PHR is used when only PUCCH is transmitted. This segmentation allows precise power determination for each specific transmission scenario without requiring a single complex reporting mechanism.
Solution Approach 2:
The patent implements dynamic PHR type selection based on the actual transmission state. The UE determines which PHR type to report based on whether PUSCH transmission occurs in the current subframe, and the base station dynamically interprets the received PHR based on the indicated PHR type. This dynamic adaptation enables precise power headroom reporting that matches the current transmission scenario.
2Productivity
If the base station configures serving cells and HARQ-ACK binding without accurate power headroom information, then the configuration process is simpler, but the efficiency of PUCCH transmission and overall LTE system performance deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the UE reports precise power headroom information to the base station through PHR messages. The feedback includes not only the power headroom value but also the PHR type indicator that helps the base station understand the transmission scenario. This accurate feedback enables the base station to make informed decisions about serving cell configuration and HARQ-ACK binding, thereby improving PUCCH transmission efficiency.
Solution Approach 2:
The patent enables preliminary power headroom assessment by the UE before actual PUCCH transmission. By calculating and reporting power headroom in advance through PHR, the base station can pre-configure serving cells and HARQ-ACK binding parameters based on accurate power information, avoiding suboptimal configurations that would reduce transmission efficiency.
Data Source
AI summary
The present invention provides a method and device for reporting a Power Headroom Report (PHR), comprises: based on the type of PUCCH to be transmitted, determining the type of the PHR; based on the type of PHR, determining a corresponding power headroom and reporting the PHR. By applying this technical solution, the base station can acquire the power headroom in the power headroom report after acquiring the power headroom report, and then be aware of the usage of power for transmitting Physical Uplink Control Channel (PUCCH) from User Equipment (UE) based on the acquired power headroom, thereby, the base station can configure the number of serving cells and the feedback mode of Channel State Information (CSI) better based on the usage of power for transmitting PUCCH; meantime, the base station determines whether or not to bind the Hybrid Automatic Retransmission Request—Acknowledgement (HARQ-ACK).