Sub-band Full Duplex Coverage for Legacy User Equipment
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Solution Overview
Problem
Legacy user equipment (UEs) in radio access networks (RANs) are unable to utilize sub-band full-duplex due to lack of necessary features, leading to cross-link interference (CLI) and inefficient resource utilization, which degrades performance and prevents extended uplink transmission.
Innovation Solution
The RAN device determines separation between UEs to assess potential CLI and enables sub-band full-duplex only when separation exceeds a threshold, using beam or UE positioning to identify safe transmission conditions and notify neighboring devices to avoid CLI, thereby conserving resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sub-band full-duplex is enabled for legacy UEs, then uplink coverage and throughput are enhanced, but cross-link interference occurs degrading performance
Solution Approach 1:
The network device performs preliminary assessment of separation conditions between UEs before enabling sub-band full-duplex. It determines whether UEs are sufficiently separated based on beam information or location data, and only enables extended uplink transmission when separation exceeds a threshold, thereby preventing cross-link interference before it occurs
Solution Approach 2:
The system continuously monitors separation conditions between UEs and adjusts sub-band full-duplex configuration accordingly. When UEs move closer than the threshold, the network device disables extended uplink transmission to avoid CLI, and re-enables it when separation is restored, creating a feedback-controlled system
2Productivity
If sub-band full-duplex is enabled for all UEs, then uplink coverage is enhanced, but computing and networking resources are wasted
Solution Approach 1:
The network device applies different sub-band full-duplex configurations to different UEs based on their individual separation conditions. Instead of uniformly enabling extended uplink transmission for all UEs, it selectively enables the feature only for UEs that meet the separation threshold, optimizing resource utilization
Solution Approach 2:
Before enabling sub-band full-duplex for a UE, the network device preliminarily assesses whether the UE meets the separation requirements by checking beam information or location data. This preliminary screening prevents unnecessary resource consumption on UEs that would cause or experience CLI
Data Source
AI summary
A network device may receive an indication to enable sub-band full duplex uplink transmission for a first user equipment (UE), and may determine whether the first UE and a second UE are associated with a separation that is more than a threshold separation. The network device may enable the sub-band full duplex uplink transmission for the first UE based on determining that the first UE and the second UE are associated with a separation that is more than the threshold separation. The network device may deny the sub-band full duplex uplink transmission for the first UE based on determining that the first UE and the second UE are associated with a separation that is less than the threshold separation.