Common Data Stream Signaling for Robust MU-MIMO Downlink
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Solution Overview
Problem
Conventional downlink MU-MIMO transmission schemes in 5G are vulnerable to imperfect channel state information, leading to inefficiencies in handling common data streams and individual data streams, particularly in 6G networks.
Innovation Solution
A network access node transmits common and individual data streams to multiple client devices, accompanied by control information indicating the type and instructions for handling the common data streams, which can be embedded in the data streams or separate control signals, enhancing flexibility and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional downlink MU-MIMO transmission is used without control information for common data streams, then the system maintains simplicity, but transmission efficiency deteriorates and robustness to imperfect CSIT is reduced
Solution Approach 1:
The patent introduces control information as an intermediary element that mediates between the transmitter and multiple receivers. This control information contains instructions on how to handle common data streams, enabling efficient decoding at receivers while maintaining system robustness to imperfect CSIT. The control information acts as a bridge that coordinates the multi-user transmission without requiring complex redesign of the entire system.
Solution Approach 2:
The control information is transmitted before or along with the data streams to prepare receivers for efficient decoding. By providing instructions in advance about how to handle common data streams, the system enables receivers to optimally process the incoming data, improving transmission efficiency before the actual data transmission occurs.
2Adaptability or versatility
If control information is transmitted separately from data streams, then handling flexibility of common data streams is improved, but signaling overhead increases
Solution Approach 1:
The patent merges the control information with the data stream transmission by embedding it within the same physical channel or resource allocation. This combining approach allows the control information to be transmitted alongside the data without requiring separate dedicated signaling resources, thereby reducing overall signaling overhead while maintaining the flexibility benefits of having explicit control information.
3Loss of information
If control information is embedded in data streams, then signaling overhead is reduced, but transmission rate for actual data decreases
Solution Approach 1:
The control information is designed to be compact and minimal, containing only the essential instructions needed for handling common data streams. By providing just the necessary control information rather than exhaustive details, the patent reduces the overhead burden on the data transmission while still achieving the desired flexibility and efficiency improvements.
Data Source
AI summary
Embodiments of the invention relate to transmission of common data streams from a network access node (100) to a plurality of client devices (300a, 300b, . . . , 300n) in a communication system (500). The network access node (100) transmits data streams (510) to the plurality of client devices (300). The data streams (510) comprises at least one common data stream addressed to the plurality of client devices (300a, 300b, . . . , 300n). The network access node (100) further transmits a control information (520) to the plurality of client devices (300a, 300b, . . . , 300n). The control information (510) indicates the meaning of the common data stream and/or instructions for what to do with the common data stream. Based on the control information (520), each the client device (300) can then process the received common data stream in an efficient way. Furthermore, embodiments of the invention also relate to corresponding methods and a computer program.