MIMO Precoding Signaling Overhead Reduction via TBS Field Encoding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems using multiple antennas face significant signalling overhead when conveying MIMO and precoder-related information, which limits control channel coverage and efficiency, particularly in dynamic channel conditions.
Innovation Solution
The method involves encoding precoding parameters using payload size-related TBS fields in control messages to reduce signalling overhead and enhance flexibility in spatial multiplexing, allowing for efficient transmission rank override and precoder confirmation without increasing overall signalling bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional MIMO control messaging is used to convey precoding information, then precoder confirmation and transmission rank indication can be provided, but signalling overhead increases and control channel coverage is limited
Solution Approach 1:
The patent combines transmission rank indication and precoder confirmation into a single unified control message structure. The TBS fields serve dual purposes: indicating transport block sizes and encoding precoding information through their bit patterns. This merging eliminates separate signalling messages for rank and precoder confirmation, reducing overall signalling overhead while maintaining reliable precoder confirmation through the integrated control message.
Solution Approach 2:
The control message fields, particularly the TBS fields, are designed to serve multiple functions simultaneously. These fields not only indicate transport block sizes for data transmission but also encode transmission rank and precoder matrix information. This multi-functionality allows the system to convey precoding information without requiring additional dedicated signalling resources, thus reducing signalling overhead while maintaining comprehensive control capabilities.
2Adaptability or versatility
If additional control information is added to convey precoding parameters, then transmission flexibility improves, but signalling bandwidth requirements increase
Solution Approach 1:
The patent utilizes the bit patterns of existing TBS field parameters to encode different transmission rank values and precoder matrix indicators. By interpreting the binary representations of TBS values in different contexts, the system can dynamically indicate various precoding configurations without adding new signalling fields. This parameter reinterpretation approach enables transmission rank adaptation and precoder selection while consuming no additional signalling bandwidth.
Solution Approach 2:
The patent adds a new dimension of interpretation to existing control message fields. Rather than adding more fields in the traditional sense, the system creates a secondary layer of meaning in the TBS field bit patterns. The same field bits serve both their original function (indicating transport block size) and a new function (indicating precoding parameters), effectively adding information density without increasing signalling bandwidth requirements.
Data Source
AI summary
Method and apparatus for conveying precoding information in a control message (M) from a first node (400) to a second node (402), with information on properties of an associated wireless data transmission (D) between the first and second nodes employing spatial multiplexing and precoding for the data transmission. The first node determines precoding parameters (P) for signal transmission to the receiving node, optionally based on feedback reports (F) from the receiving node. The first node encodes control information bits in precoding information fields of the control message by means of values in TBS fields of the control message, such that the TBS field values determine the interpretation of the bits in the precoding information field(s). The control message (M) is then sent to the second node.