SDMA Backhaul Multiplexing Using Antenna Arrays
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Solution Overview
Problem
Current wireless communication systems face inefficiencies due to the need for separate time-frequency resources for backhaul and user data, which can lead to delayed network deployment and reduced efficiency, especially when separate resources are unavailable.
Innovation Solution
The system employs Spatial Division Multiple Access (SDMA) to simultaneously transmit both backhaul and user data using the same time-frequency resources, eliminating the need for additional bandwidth and dedicated carriers by utilizing antenna arrays for efficient multiplexing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate time-frequency resources are allocated for backhaul and user data, then communication reliability is improved, but resource utilization efficiency deteriorates and network deployment speed is reduced
Solution Approach 1:
The patent transitions from separating backhaul and user data in time-frequency dimensions to separating them in the spatial dimension using SDMA. Multiple antenna arrays at the base station create distinct spatial channels, allowing simultaneous transmission of backhaul and user data over the same time-frequency resources without interference, thus resolving the contradiction between resource utilization and communication reliability.
Solution Approach 2:
The base station's antenna array is segmented into multiple independent antenna groups, each forming separate beamforming channels. One channel is dedicated to backhaul communication while another serves user data, enabling spatial multiplexing that simultaneously achieves high resource utilization and reliable communication for both traffic types.
2Object-generated harmful factors
If separate frequency resources are used for backhaul, then interference between backhaul and user data is reduced, but available bandwidth is reduced and network deployment is delayed
Solution Approach 1:
Instead of allocating separate frequency resources for backhaul and user data, the patent utilizes the spatial dimension through antenna arrays and beamforming. This allows both types of traffic to share the same frequency spectrum while maintaining isolation through spatial separation, thereby maximizing available bandwidth while preventing interference.
Solution Approach 2:
The antenna array system is designed to perform multiple functions simultaneously: it can form independent beams for backhaul communication and user data transmission using the same frequency resources. This multi-functionality enables the system to adapt to different traffic requirements without needing separate frequency allocations.
3Stability of the object's composition
If wired connections are used for backhaul, then communication stability is improved, but network deployment speed is reduced and cost increases
Solution Approach 1:
The patent replaces the mechanical wired backhaul connection system with a wireless SDMA-based backhaul system. By using antenna arrays and spatial beamforming, the system achieves stable wireless backhaul communication without requiring physical cable installations, thereby significantly reducing network deployment time while maintaining communication stability through spatial channel isolation.
4Object-generated harmful factors
If wireless backhaul uses different spectral allocations, then interference with user data is reduced, but resource availability is reduced and quality is compromised
Solution Approach 1:
The patent eliminates the need for different spectral allocations by utilizing spatial dimension for separation. The SDMA system allows backhaul and user data to coexist on the same frequency spectrum by creating orthogonal spatial channels through antenna arrays, thereby maximizing resource availability while maintaining signal quality and minimizing interference.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables efficient multiplexing of backhaul and user data without requiring separate resources, facilitating rapid network deployment and improved network efficiency by allowing simultaneous communication on the same time-frequency resources.
Implementation Method 1
an antenna array forms multiple spatial channels to allow several communication links to share the same time frequency resources. A receive antenna array employs multiple receive beamformers, each arranged to receive one communication link
Implementation Method 2
a transmit antenna array employs multiple transmit beamformers, each arranged to transmit one communication link towards its intended recipient while transmitting it away from other receivers through transmit spatial nulling
Data Source
AI summary
A system [100] includes a base station [105] to communicate wireless data with at least one user terminal [125, 130] within a cell serviced by the base station [105]. A central backhaul access point [135] communicates wireless backhaul data with the base station [105]. At least a first portion of the wireless data and a second portion of the wireless backhaul data is communicated via Spatial Division Multiple Access (“SDMA”), and the first portion of the wireless data utilizes at least some same time-frequency resources as the second portion of the wireless backhaul data.