Wireless Control Signaling Using Transmit Antenna Count
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Solution Overview
Problem
In broadband wireless systems, particularly OFDMA-based systems, the precision and scope of control information transmission regarding data streams are limited by the implicit signaling of control channels, which affects transmission rates and decoding accuracy, especially in MU-MIMO transmissions where the number of transmit antennas is not effectively utilized.
Innovation Solution
The method involves signaling the number of transmit antennas to receivers, allowing them to interpret control signal bits differently based on the number of antennas, thereby expanding the scope and precision of data stream parameter information without increasing the information transmitted, using customized indexing schemes for each base station's number of antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If implicit signaling via control channel is used, then the system complexity is reduced, but the precision and scope of control information transmission is limited
Solution Approach 1:
The patent introduces a new dimension for control information transmission by utilizing the number of transmit antennas as an additional signaling parameter. Instead of solely relying on the content of control signal bits, the system now uses the antenna count itself to convey additional parameter information, effectively adding a dimensional layer to the existing control channel signaling mechanism without increasing its complexity
Solution Approach 2:
The patent changes the interpretation parameters of the control signal by establishing different mapping relationships between control signal bits and data stream parameters based on the number of transmit antennas. The same control signal bits can represent different parameter allocations depending on the antenna configuration, thereby expanding the information scope without increasing signaling overhead
2Device complexity
If the number of transmit antennas is not utilized in signaling, then the control channel structure remains simple, but the transmission rate and decoding accuracy are affected
Solution Approach 1:
The patent enables the transmit antenna configuration to serve dual purposes: its original function for MIMO transmission and an additional function for conveying parameter allocation information. The antenna configuration essentially 'pays for itself' by providing free signaling capacity that improves transmission rate and decoding accuracy without requiring additional dedicated signaling resources
3Measurement precision
If customized indexing schemes are used for each number of antennas, then the precision of parameter information is improved, but the device complexity increases
Solution Approach 1:
The patent applies different indexing schemes locally according to the specific antenna configuration. Each antenna count (2, 4, or 8) has its own customized mapping table that optimizes parameter information precision for that specific configuration. This local customization approach allows high precision without requiring a single complex universal indexing scheme
Data Source
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AI summary
Systems and methods for conveying wireless transmission allocation information are disclosed. In accordance with one method, an index indicating selected data stream parameters is received. In addition, an indication of a number of transmit antennas at a transmitter from which the data stream is transmitted is also received. Further, the selected parameters are determined from the index based on the number of transmit antennas at the transmitter. Moreover, data signals are received and processed with a processor in accordance with the selected data stream parameters.