RU Spatial Sampling for Full Beam Resolution With Fewer Ports
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Solution Overview
Problem
Existing wireless communication systems require a large number of RU ports to achieve full spatial resolution, leading to significant signaling overhead and inefficiencies in managing beamforming operations.
Innovation Solution
Implementing a special RU port configured to handle multiple spatial beam directions and processing operations, such as discrete Fourier transforms, to reduce the number of necessary RU ports by allowing multiple samples per resource element and defining logical entities that represent multiple spatial directions and receive paths, thereby optimizing beamforming and reducing signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple RU ports are used to achieve full spatial resolution, then measurement precision is improved, but device complexity increases
Solution Approach 1:
A single RU port is designed to perform multiple functions by supporting multiple spatial beam directions and processing operations. The RU port can be configured to represent different beams and perform different data processing operations (such as DFT with different window lengths) based on DACI messages received from the LLS-CU, eliminating the need for separate RU ports for each spatial direction
Solution Approach 2:
The RU port configuration is made dynamic through DACI messages that can change the beam identification and data processing operations in real-time. The system can switch between different spatial beam directions and processing modes (e.g., different DFT window lengths) as needed, allowing a single RU port to adaptively serve multiple spatial resolution requirements
2Adaptability or versatility
If multiple RU ports are used to represent multiple spatial beam directions, then adaptability is improved, but loss of information increases
Solution Approach 1:
Instead of creating separate physical RU ports for each spatial direction, the system uses virtual representations through beam identification fields in DACI messages. These messages carry control information that copies the functional behavior of multiple RU ports through a single RU port, reducing signaling overhead while maintaining adaptability
Solution Approach 2:
The system changes parameters (beam identification, data processing operation type, window length) through DACI messages to achieve different spatial beam directions and processing modes. By dynamically adjusting these parameters rather than creating separate RU ports, the system maintains adaptability while minimizing the loss of information through reduced signaling overhead
Data Source
AI summary
Method, devices and systems for operating a radio unit, RU, in a network node of a wireless communication system are provided. Operations of such methods include receiving a request from a lower-layer split central unit, LLS-CU. The request includes an indication regarding multiple identified channels for receiving the spatial information for determining a direction to a user equipment. Operations include providing, in the RU, a spatial information receiver that is configured to represent multiple spatial beam directions and/or receive paths responsive to the request from the LLS-CU. Operations include receiving, into the spatial information receiver and via multiple radio branches that correspond to multiple antennas, beam signal information corresponding to multiple ones of the antennas.