Multiplexing Feedback Information in Sidelink Control Data
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Solution Overview
Problem
In device-to-device (D2D) communication, the simultaneous transmission of feedback information and data on different frequency domain resources within the same subframe increases the peak-to-average power ratio (PAPR) of the system, reducing effective transmit power and shortening transmission distance.
Innovation Solution
The feedback information is carried within the sidelink control information (SCI) or a data packet carrying second data, allowing for multiplexing without using an additional frequency domain resource, thereby reducing PAPR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback information is sent on a feedback channel resource and data is sent on a data channel resource in the same subframe, then feedback information can be transmitted separately, but the peak-to-average power ratio (PAPR) of the system increases
Solution Approach 1:
The patent combines feedback information and data into a single transmission channel. Specifically, feedback information is multiplexed with data in the same physical uplink shared channel (PUSCH), eliminating the need for separate feedback channel resources. This merging approach maintains reliable feedback transmission while avoiding the PAPR increase that occurs when feedback and data are transmitted simultaneously on different channels.
Solution Approach 2:
The patent makes the uplink data channel serve multiple functions by enabling it to carry both data and feedback information. The PUSCH is designed to handle dual purposes: transmitting user data and conveying feedback information about downlink data reception. This multi-functionality reduces the need for dedicated feedback resources and lowers system PAPR.
2Reliability
If feedback information is sent on a feedback channel resource in the same subframe as data, then feedback can be transmitted, but effective transmit power is reduced
Solution Approach 1:
The patent merges feedback information transmission with data transmission in the same PUSCH resource. By combining these transmissions, the system avoids the power division that occurs when separate channels are used, thereby maintaining higher effective transmit power for both data and feedback information.
Solution Approach 2:
The patent uses the existing data channel infrastructure to carry feedback information, effectively copying the data transmission mechanism to serve dual purposes. This approach leverages the already-allocated power resources for data transmission to also support feedback transmission, avoiding additional power consumption.
3Reliability
If feedback information is sent on a feedback channel resource in the same subframe as data, then feedback can be transmitted, but transmission distance is shortened
Solution Approach 1:
The patent combines feedback information with data in the same PUSCH transmission, ensuring that both signals benefit from the full transmit power allocation. This merging approach maintains signal strength over longer distances compared to separate channel transmissions where power is divided.
Solution Approach 2:
The patent changes the transmission parameters by multiplexing feedback information within the data channel structure. This parameter change allows the system to utilize the data channel's power and resource allocation for feedback transmission, thereby extending the effective transmission distance for feedback information.
Data Source
AI summary
Embodiments of the present invention describe a feedback information transmission method and apparatus. The feedback information transmission method may include receiving, by a first terminal, first data sent by a second terminal. The method may also include sending, by the first terminal, feedback information for the first data to the second terminal in a first subframe, where there is second data to be sent by the first terminal in the first subframe. The feedback information may be carried in sidelink control information (SCI) of the second data, or the feedback information may be carried in a data packet carrying the second data.