Full Duplex Node Scheduling for Self-Interference Mitigation
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Solution Overview
Problem
Current wireless telecommunications networks face challenges in implementing full duplex communication due to high self-interference issues, especially with mobile devices, which require impractical ADC resolution and complex transceiver designs, making it difficult to efficiently use the limited spectrum effectively.
Innovation Solution
A method is proposed where a full-duplex node in a wireless telecommunications network schedules half-duplex user equipment in groups of two UEs to use different resource elements for uplink and downlink transmissions, selecting UEs based on location and data rate requirements to maximize path-loss and minimize interference, using multiple antennas to form beams and nulls to reduce interference further.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full duplex communication is implemented using the same frequency band for simultaneous transmission and reception, then spectrum efficiency is improved, but self-interference from transmitted signals saturates the receiver chain requiring impractical ADC resolution
Solution Approach 1:
The resource block is segmented into different resource elements, with the first set reserved for downlink control channel transmissions and the second set available for uplink transmissions. This segmentation allows the system to achieve full duplex operation while preventing self-interference saturation by ensuring that downlink control signals are transmitted on protected resource elements that do not conflict with uplink signals.
2Reliability
If accurate channel estimations are required for full duplex communication, then communication reliability is improved, but this is only feasible for point to point links where the channel remains static, causing problems for mobile devices where the channel changes quickly
Solution Approach 1:
Downlink control channel transmissions are performed preliminarily using the first set of resource elements to establish reliable channel estimates before uplink data transmissions occur. This preliminary downlink transmission provides the mobile device with accurate channel state information needed for subsequent uplink transmissions, even in mobile environments where the channel changes quickly.
3Reliability
If complex transceiver architecture is designed to cancel leakage and reflections of transmitted signals, then full duplex communication reliability is improved, but the complexity and cost becomes too expensive to implement in user equipment
Solution Approach 1:
The downlink control channel transmissions are extracted and isolated on the first set of resource elements, separate from the uplink resource elements. This extraction approach eliminates the need for complex interference cancellation architectures in user equipment, as the downlink control signals are transmitted on dedicated resource elements that do not require cancellation of self-interference.
4Object-affected harmful factors
If different resource elements are allocated for downlink control channel and uplink transmissions, then self-interference is minimized enabling full duplex operation, but the available resources for each direction are reduced
Solution Approach 1:
The second set of resource elements serves multiple functions: it is used for uplink data transmissions from user equipment and simultaneously serves as the resource pool for full duplex operations. This multi-functionality allows the system to maintain adequate resources for both downlink and uplink while enabling full duplex communication on the same frequency band.
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 full duplex communication, doubling the available frequency spectrum and network capacity while maintaining backwards compatibility with standard UEs, by minimizing interference and optimizing resource allocation, thus enhancing spectrum reuse and network performance.
Implementation Method 1
A transmission profile of respective ones of the UEs in a group can be modified to form a transmission beam from a UE to the node using one or more of multiple antennas of the UEs
Implementation Method 2
The transmission profile of respective ones of the UEs in the group can be modified to form a null in the direction of the other UE in the group
Data Source
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AI summary
A method for full duplex communication using a node in a wireless telecommunications network, including selecting a first set of resource elements of a resource block for downlink (DL) control channel data transmission by the node, and scheduling half-duplex user equipment (UE) in groups of two UEs for full duplex communication with the node wherein uplink (UL) transmissions to the node from the UEs use a second set of resource elements of the resource block different from the first set.