Downlink Control Information Signaling for Dynamic MIMO Mode Switching
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Solution Overview
Problem
Current LTE technologies do not support dynamic switching between single user multi-stream transmission and multi-user transmission, and lack efficient signaling for MIMO multi-user transmission based on demodulation reference signals, limiting the ability to manage and optimize MIMO data transmission effectively.
Innovation Solution
A method and system that utilize new indication signaling in the downlink control information format to indicate different joint encoded parameters, such as the number of transmitted layers, scrambling identity, antenna port, and reference signal information, when the number of enabled transport blocks varies, enabling dynamic management of MIMO data transmission and supporting multi-user transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the DCI format 1D is used to support MU-MIMO transmission mode 5, then the dynamic switch between SU-MIMO mode and MU-MIMO mode is supported, but the DCI format only supports the transmission of one stream for one UE and cannot perform the dynamic switch between single user multi-stream transmission and multi-user transmission
Solution Approach 1:
The patent extends the DCI format to serve multiple transmission modes (SU-MIMO and MU-MIMO) and multiple stream configurations through a unified signaling structure. By introducing a transport block to indicator field and configurable joint encoding, the same DCI format can dynamically indicate different transmission modes and stream numbers, making the system universal rather than mode-specific
Solution Approach 2:
The patent introduces dynamic switching capability between SU-MIMO and MU-MIMO modes through configurable joint encoding parameters. The network can dynamically adjust the joint encoding configuration based on channel conditions and traffic requirements, allowing the system to transition between different transmission modes and stream configurations in real-time rather than being static or half-static
2Productivity
If LTE Release 8 transmission mode 4 is used to support single user transmission of at most two streams, then the transmission capability is limited, but the switch between transmission modes can only be half static and cannot perform dynamic switch between single user multi-stream transmission and multi-user transmission
Solution Approach 1:
The patent creates a unified DCI format that can handle both SU-MIMO and MU-MIMO transmissions, as well as different stream configurations (single-stream, two-stream, multi-stream). This universal format eliminates the need for separate transmission modes and enables dynamic adaptation between different productivity requirements
Solution Approach 2:
The patent changes the signaling parameters to enable dynamic mode switching. By introducing a transport block to indicator field and allowing configurable joint encoding, the system can dynamically adjust transmission parameters (mode, stream number, resource allocation) based on channel conditions and traffic demands, achieving both high productivity and adaptability
3Adaptability or versatility
If new indication signaling is added to support MIMO multi-user transmission based on DMRS, then the transmission capability is enhanced, but the signaling overhead and system complexity increase
Solution Approach 1:
The patent merges the indication of transport block status, DMRS configuration, and transmission mode into a single transport block to indicator field. By combining multiple functions into one signaling element and using joint encoding, the patent reduces the overall signaling overhead while still providing comprehensive control for MIMO multi-user transmission based on DMRS
Solution Approach 2:
The patent designs the DCI format to serve multiple purposes: indicating transport block status, configuring DMRS parameters, and controlling transmission mode. This multi-functional approach avoids the need for separate signaling for each function, thereby reducing overall system complexity while enabling advanced MIMO multi-user transmission
Data Source
Figure 1
AI summary
A method and system for indicating a transmission parameter are provided in the present invention. The method includes: when multi-user multi-input multi-output (MIMO) data are transmitted, using a newly-added indication signaling in a downlink control information format to indicate different joint encoded parameters when numbers of enabled transport blocks are different. Through adding new indication signaling in the present invention, different joint encoded parameters are indicated during the multi-user MIMO data transmission and the MIMO multi-user transmission based on the demodulation reference signal is supported.