Flexible UE-to-Layer Mapping in PDMA Systems
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Solution Overview
Problem
In the context of the PDMA technology, the existing systems face limitations in increasing the transmission load of User Equipment (UE) when a small number of users are scheduled, leading to restricted throughput due to inflexible mapping of users to encoding matrices.
Innovation Solution
The proposed solution involves acquiring a current data transmission rule that allows for flexible selection of pattern-mapping encoding matrices, enabling one UE to be mapped to multiple data layers, thereby increasing the transmission load and throughput, while reducing modulation encoding levels and algorithm complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional PDMA technology uses fixed mapping of one UE to one column of encoding matrix, then the system implementation is simple, but the transmission load of UE cannot be increased when small number of users are scheduled, limiting system throughput
Solution Approach 1:
The patent applies dynamics by making the mapping relationship between UEs and encoding matrix columns flexible and adjustable rather than fixed. The network device can dynamically determine which columns of the encoding matrix to allocate to each UE based on the number of scheduled UEs, allowing the system to adapt to different scheduling scenarios and maximize throughput.
Solution Approach 2:
The patent changes the parameter of mapping configuration from fixed to variable. By allowing one UE to be mapped to multiple columns of the encoding matrix when the number of scheduled UEs is small, the transmission load per UE can be increased, thereby improving system throughput without changing the physical structure.
2Productivity
If one UE is mapped to multiple data layers to increase transmission load, then system throughput improves, but receiver algorithm complexity increases
Solution Approach 1:
The patent applies partial action by allowing UEs to occupy multiple columns of the encoding matrix only when necessary (when the number of scheduled UEs is small). This partial application of multi-layer mapping increases transmission load without requiring the receiver to handle full complexity in all scenarios, as the network can control when this mode is activated.
Data Source
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Figure 2b~2c
AI summary
The present disclosure provides a data transmission method and a data transmission device, so as to achieve a mapping relationship between multi-user data and an encoding matrix in a flexible manner, and improve the system performance. The data transmission method includes steps of: acquiring, by a network side, a current data transmission rule, the current data transmission rule including a mapping relationship between currently-scheduled K UEs and data layers on N transmission resources corresponding to a selected encoding matrix, one UE at least occupying one data layer; and transmitting, by the network side, data to the K UEs in accordance with the current data transmission rule. In this way, it is able to flexibly select various pattern-mapping encoding matrices and increase a transmission load of the UE, thereby to increase a throughput of the entire system. In addition, it is able to reduce a modulation encoding level while ensuring the spectral efficiency, thereby to further reduce algorithm complexity of a receiver.