Spatially Grouped DMRS for Multi-User Uplink Capacity
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Solution Overview
Problem
Current wireless communication networks are facing bandwidth constraints due to the exponential growth in data traffic and the need to provide high-quality service to a large number of user devices, necessitating improved methods for managing uplink transmissions.
Innovation Solution
Grouping wireless devices into spatial groups based on estimated angles of arrival and configuring them to use overlapping time-frequency resources for uplink data transmissions, with scheduled demodulation reference signal transmissions and specific antenna port configurations to optimize resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If more wireless devices are served simultaneously, then network capacity increases, but bandwidth becomes insufficient and interference increases
Solution Approach 1:
The patent segments wireless devices into multiple spatial groups based on their geographic locations and signal characteristics. Each spatial group is assigned dedicated time-frequency resources for uplink transmissions, allowing simultaneous service of multiple devices without mutual interference. This segmentation enables the network to serve more devices (increasing productivity) while maintaining adequate bandwidth allocation for each group.
Solution Approach 2:
The patent introduces spatial dimension as a new resource allocation dimension alongside time and frequency. By utilizing spatial groups formed from device location information and signal arrival angles, the system creates orthogonal transmission spaces that allow multiple devices to transmit simultaneously on the same time-frequency resources without interference, effectively increasing network capacity without requiring additional bandwidth.
2Productivity
If time-frequency resources are allocated for uplink transmissions, then data transmission capacity increases, but reference signal interference between devices increases
Solution Approach 1:
The patent segments the time-frequency resource space into distinct resource sets associated with different spatial groups. Each spatial group receives dedicated reference signal resources that are orthogonal to other groups' resources. This segmentation ensures that reference signals from different spatial groups do not interfere with each other, while still allowing efficient data transmission across all groups simultaneously.
Solution Approach 2:
The patent introduces spatial groups as intermediary structures that mediate between individual devices and the shared time-frequency resources. Each spatial group acts as a coordinated unit that manages its own reference signal transmissions, ensuring that the reference signals serve as effective intermediaries for channel estimation without creating harmful interference between different device groups.
Data Source
AI summary
A method of wireless communication performed by a base station includes grouping a plurality of wireless devices associated with a coverage area of the base station into multiple spatial groups, and configuring the wireless devices in each spatial group to use overlapping time-frequency transmission resources for uplink (UL) data transmissions to the base station. The method also includes scheduling, on a same set of time-frequency transmission resources, demodulation reference signal (DMRS) transmissions by the wireless devices in a respective spatial group of the multiple spatial groups. In various aspects, the multiple spatial groups are determined based on respective estimated angles of arrival of the plurality of wireless devices associated with the coverage area of the base station. In some instances, each of the wireless devices in the respective spatial group uses the same antenna ports as the other wireless devices in the respective spatial group for the DMRS transmissions.