Index Modulation on DMRS for Short Control Messaging
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Solution Overview
Problem
Wireless communication networks face interference and congestion due to increased demand for mobile broadband access, which degrades performance on both downlink and uplink transmissions, especially in densely deployed networks.
Innovation Solution
Implementing short control messaging using index modulation on demodulation reference signals (DMRS) allows for efficient communication by mapping configuration actions onto inactive subcarrier resource elements, reducing interference and latency without increasing complexity in downlink control signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If traditional downlink control signaling is used to transmit control messages to user equipment, then control information can be delivered reliably, but the signaling overhead increases and processing complexity increases due to blind decodings required at user equipment
Solution Approach 1:
The patent combines control message transmission with the existing DMRS structure by mapping control messages onto inactive subcarrier REs of the DMRS sequence. This merging eliminates the need for separate control channels and blind decodings at the UE, as the control information is embedded within the reference signal that the UE already processes for channel estimation.
Solution Approach 2:
The DMRS structure is given multi-functionality by enabling it to serve both its traditional purpose of channel estimation and the new function of carrying control messages. The inactive subcarrier REs of the DMRS sequence are utilized to transport control information, allowing a single signal element to perform multiple functions simultaneously.
2Quantity of substance
If more control signaling resources are allocated to meet increasing demand for mobile broadband access, then control message capacity increases, but network interference and congestion worsen
Solution Approach 1:
The patent utilizes the existing DMRS structure and its inactive subcarrier REs to carry control messages, making the reference signal serve its own additional function. This self-service approach eliminates the need for dedicated control signaling resources that would contribute to network congestion and interference.
Solution Approach 2:
The patent changes the utilization parameter of the DMRS structure by activating previously inactive subcarrier REs for control message transmission. This parameter change enables control information capacity without adding new signaling resources that would increase network interference.
3Reliability
If control messages are transmitted using existing DMRS structure without modifications, then the DMRS maintains its channel estimation function, but control message transmission capability is lost
Solution Approach 1:
The patent segments the DMRS structure into active subcarrier REs for channel estimation and inactive subcarrier REs for control message transmission. This segmentation allows the DMRS to simultaneously maintain its channel estimation function while gaining control message transmission capability through the previously unused inactive REs.
Solution Approach 2:
The patent adds a new dimension of functionality to the DMRS structure by utilizing the time-frequency resources of inactive subcarrier REs. This dimensional expansion allows the DMRS to carry control messages in addition to its traditional channel estimation function without interfering with the existing signal structure.
Data Source
AI summary
This disclosure provides systems, methods, and devices for wireless communication that support short control messaging using index modulation on DMRS. In a first aspect, a method of wireless communication includes a base station determining a configuration action for a served user equipment (UE) in communication with the base station. The base station may then generate a short control message associated with the configuration action and map that short control message onto a set of inactive subcarrier resource elements (REs) of a demodulation reference signal (DMRS) sequence. The served UE may then receive the transmitted DMRS sequence and determine the short control message within the set of inactive subcarrier REs of the DMRS sequence. Other aspects and features are also claimed and described.