UE Multi-User Receiver Switching via Dynamic DCI Indicators
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Solution Overview
Problem
In LTE networks, there is a lack of methods for a UE to acquire the Downlink Control Indication (DCI) information of another UE for multi-user transmission, which is essential for correctly decoding signals in Non-Orthogonal Multiple-Access (NOMA) techniques, especially for UEs experiencing strong interference.
Innovation Solution
A method is introduced where pre-configuration information is sent over a radio link higher than the physical layer, allowing a UE to determine if multi-user transmission is enabled and to identify paired UEs by using dynamic indicators within the subframe, such as the CRC part or CIF field, to obtain the necessary DCI information for decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If NOMA technique is used for downlink multi-user transmission, then spectral efficiency and system capacity are improved, but the complexity of signal decoding and interference management increases
Solution Approach 1:
The patent segments the multi-user transmission signal into distinct layers with different power levels. The base station divides the total transmit power into multiple layers, assigning different power ratios to different users. This segmentation allows the near user to separately decode signals from different layers by treating higher power layers as interference, then canceling them out, thereby reducing decoding complexity while maintaining high spectral efficiency
Solution Approach 2:
The patent implements preliminary action by pre-configuring power allocation ratios and precoding matrices at the base station before transmission. The base station calculates and prepares the power distribution for each user layer in advance, and the near user equipment is pre-configured with the power ratios of far users. This preliminary preparation enables the receiving end to perform successive interference cancellation more efficiently without real-time computation overhead
2Adaptability or versatility
If pre-configuration information is transmitted over radio link at higher layer, then flexibility and adaptability of multi-user transmission are improved, but signaling overhead and system resource consumption increase
Solution Approach 1:
The patent makes the pre-configuration information mechanism universal by designing it to support both NOMA and orthogonal multi-access modes. The same RRC signaling structure can configure power ratios for NOMA users or standard parameters for orthogonal users, making the system flexible enough to adapt to different transmission modes without requiring separate configuration mechanisms, thereby achieving multi-functionality
Solution Approach 2:
The patent applies partial action by selectively transmitting pre-configuration information only to user equipment that requires NOMA functionality. Not all UEs are configured with multi-user power ratios and precoding matrices - only those identified as participating in NOMA transmissions receive this additional configuration, thereby reducing unnecessary signaling overhead while maintaining the flexibility needed for multi-user scenarios
3Adaptability or versatility
If dynamic indicators are used within subframe to switch between single-user and multi-user receivers, then real-time adaptability is improved, but processing complexity and detection difficulty increase
Solution Approach 1:
The patent uses DCI format indicators as signaling 'colors' to differentiate between single-user and multi-user transmission modes. Specific DCI formats or format combinations are assigned to indicate NOMA transmission, allowing the user equipment to quickly identify the transmission type through format recognition rather than complex signal analysis, thereby reducing detection complexity while maintaining real-time adaptability
Data Source
AI summary
A method for configuring downlink multi-user transmission in a telecommunication network is provided. The method comprises receiving, at a first User Equipment (UE), data within a subframe wherein the data comprises a dynamic indicator; determining, by the first UE based on the received dynamic indicator, if the data within the subframe is for multi-user transmission, and if not so determined, using, by the first UE, a single-user receiver to decode the received data; and if so determined, identifying, by the first UE based on the dynamic indicator, at least one second UE that is paired with the first UE in multi-user transmission, and obtaining, by the first UE DCI information of said at least one second UE.