UE Power Allocation for Same-Subframe Control and Data Channels
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Solution Overview
Problem
The existing D2D protocol for V2X communication faces challenges in allocating transmit power between control and data channels when control information and data are transmitted in the same subframe, leading to inefficiencies and potential power limitations.
Innovation Solution
A method for determining transmit powers of control and data channels based on maximum transmit power, bandwidth, and carrier type, ensuring that the sum of these powers does not exceed the maximum available power, using formulas that consider path loss and bandwidth ratios to allocate power proportionally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If control information and data information are transmitted at different times according to existing D2D protocol, then transmit power allocation is simpler, but communication delay increases and efficiency decreases
Solution Approach 1:
The patent merges the transmission of control information and data information into the same subframe. Specifically, the control channel (PSCCH) and data channel (PSSCH) are transmitted simultaneously in time, allowing the terminal to allocate transmit power to both channels within the same transmission time interval, thereby eliminating the time delay caused by sequential transmission while managing power distribution through scaling factors.
2Loss of time
If control information and data information are sent in the same subframe to reduce delay, then communication efficiency improves, but transmit power allocation becomes complex and challenging
Solution Approach 1:
The patent changes the power allocation parameters by introducing scaling factors (w1 and w2) that adjust the transmit power distribution between the control channel and data channel. The terminal determines the initial transmit power for each channel based on bandwidth and other parameters, then applies scaling factors to ensure the total power does not exceed the maximum available power, thereby simplifying the complex power allocation problem into a parameter adjustment process.
Solution Approach 2:
The patent implements dynamic power allocation where the scaling factors are adjusted based on real-time conditions such as channel quality, buffer status, and maximum available power. This dynamic adjustment allows the system to optimize the trade-off between control channel reliability and data channel throughput adaptively, rather than using fixed power allocation rules.
3Productivity
If more transmit power is allocated to data channel to improve throughput, then data transmission efficiency increases, but control channel reliability may deteriorate
Solution Approach 1:
The patent incorporates feedback mechanisms where the terminal monitors the quality of both control and data channels, and adjusts the scaling factors accordingly. Based on channel state information and transmission outcomes, the system provides feedback to optimize future power allocations, ensuring that control channel reliability is maintained while maximizing data throughput through iterative adjustments.
Data Source
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Figure 3
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AI summary
Embodiments of the present invention provide a data transmission method, including: obtaining, by user equipment UE, a maximum transmit power; determining, by the UE, a transmit power of a data channel and/or a transmit power of a control channel based on the maximum transmit power and a first parameter, where the first parameter includes at least one of the following: a bandwidth of the data channel, a bandwidth of the control channel, or a carrier type of a carrier of the first link; and sending, by the UE, the control channel and the data channel in a same subframe. Therefore, in the embodiments of the present invention, when the data channel and the control channel are sent in the same subframe, the transmit power of the data channel and the transmit power of the control channel can be determined based on at least one of the maximum transmit power, the bandwidth of the data channel, the bandwidth of the control channel, or the carrier type of the carrier of the first link, to properly determine the transmit powers of control information and data.