Wireless Scheduling Using UE Proximity to Avoid HD-FDD Interference
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Solution Overview
Problem
In half-duplex frequency division duplex (HD-FDD) systems, particularly in small form factor devices like handsets, achieving sufficient radio frequency filtering to prevent interference between uplink and downlink transmissions is challenging due to narrow duplex spacing and gap, making full-duplex operation impractical.
Innovation Solution
A cellular communication system with a scheduler that utilizes location information to coordinate resource allocation, ensuring that UEs in close proximity are not scheduled with simultaneous uplink and downlink time slots to mitigate inter-user interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If narrow duplex spacing and gap are used in HD-FDD systems, then device size is reduced and filtering requirements are relaxed, but interference between uplink and downlink transmissions increases
Solution Approach 1:
The patent segments the time domain by alternating uplink and downlink time slots in a half-duplex manner, preventing simultaneous transmission in both directions. This temporal segmentation allows narrow duplex spacing while avoiding interference, as one direction is inactive when the other transmits.
Solution Approach 2:
The system implements periodic switching between uplink and downlink time slots, creating a rhythmic pattern of transmission and reception. This periodic action ensures that transmit and receive operations are separated in time, eliminating the need for complex filtering while maintaining compact device design.
2Productivity
If full-duplex operation is implemented, then communication efficiency is improved, but radio frequency filtering complexity increases
Solution Approach 1:
Instead of attempting full-duplex operation that requires complex filtering, the patent inverts the approach by using half-duplex operation with simple filtering. The system achieves efficient communication through intelligent scheduling of time slots rather than through complex RF filtering, effectively solving the problem by doing the opposite of what is traditionally required.
3Object-affected harmful factors
If location-based scheduling is implemented, then inter-user interference is reduced, but scheduling complexity increases
Solution Approach 1:
The system performs preliminary actions by determining UE locations and calculating safe distances before scheduling transmission time slots. This advance preparation allows the scheduler to pre-identify potential interference scenarios and allocate time slots accordingly, reducing inter-user interference through proactive rather than reactive scheduling.
Solution Approach 2:
The patent introduces location information and safe distance calculations as intermediary factors between UE identification and time slot allocation. These intermediaries serve as mediating parameters that enable the scheduler to make informed decisions about resource allocation, balancing interference avoidance with scheduling complexity.
Data Source
AI summary
A base station (BS) is configured to receive a communication indicating a location of a first UE, wherein the first UE is in proximity to a second UE. The BS is further configured to receive a resource request from the first UE for scheduling information to the second UE. A base station (BS) is configured to transmit, based on the first UE and the second UE being in proximity, the scheduling information to the first UE indicating first frequency resources for the first UE to transmit first uplink data to the second UE in a time slot, and indicating second frequency resources that at least partially overlap with the first frequency resources in the time slot.