Device-to-Device Channel Quality Feedback via MAC CE
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Solution Overview
Problem
In device-to-device communication, channel quality feedback cannot be carried out between devices, leading to inefficiencies in communication.
Innovation Solution
A channel quality feedback method and apparatus where a first terminal receives indication information from a second terminal to send a channel quality indicator and/or a rank indicator, generates a media access control control element (MAC CE) including these indicators, and sends it back to the second terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If device-to-device communication is implemented without channel quality feedback, then transmission delay is reduced and spectrum efficiency is improved, but communication reliability deteriorates due to inability to adjust transmission parameters based on channel conditions
Solution Approach 1:
The patent implements channel quality feedback mechanism where the first terminal measures the channel quality indicator (CQI) based on reference signals from the second terminal, generates a media access control control element (MAC CE) containing the CQI, and feeds it back to the second terminal. This feedback enables the second terminal to adjust transmission parameters according to actual channel conditions, resolving the contradiction between fast direct communication and reliable adaptive transmission.
2Reliability
If channel quality feedback is added to device-to-device communication, then communication reliability is improved through parameter adjustment, but device complexity increases due to additional measurement and signaling components
Solution Approach 1:
The first terminal autonomously performs channel quality measurement by receiving reference signals from the second terminal, calculating the channel quality indicator (CQI) based on signal strength and interference levels, and generating the feedback MAC CE without requiring additional network infrastructure or complex coordination protocols. This self-service approach improves reliability while minimizing added complexity.
Data Source
AI summary
A channel quality feedback method and apparatus are provided. The method includes: a first terminal receives indication information sent by a second terminal, where the indication information is used to instruct the first terminal to send a channel quality indicator and/or a rank indicator to the second terminal. The first terminal generates a media access control control element (MAC CE), where the MAC CE includes the channel quality indicator and/or the rank indicator. The first terminal sends the MAC CE to the second terminal. The first terminal sends the MAC CE including the channel quality indicator and/or the rank indicator to the second terminal.