UE Duplex Operation Rules for Sub-Band Full Duplex Conflicts
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional duplex operations in 5G NR, including Time Division Duplex (TDD) and Frequency Division Duplex (FDD), face challenges such as increased latency, reduced coverage, and wastage of spectrum resources, particularly in uplink transmissions, necessitating the introduction of Sub-band Full Duplex (SBFD) to enable simultaneous transmission and reception. However, existing specifications lack clear guidelines for handling time domain conflicts in UE operations when applying Full Duplex.
Innovation Solution
A method for duplex operation in user equipment (UE) involving the reception of indications for DL and UL transmissions, with specific rules for performing DL or UL operations through designated resources, including higher layer configurations and dynamic scheduling, to manage conflicts and enhance UL coverage and reduce latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If TDD uses the same frequency band for both transmitting and receiving data in non-overlapping time resources, then spectrum efficiency is improved, but uplink latency increases and coverage is reduced
Solution Approach 1:
The patent divides the frequency band into multiple sub-bands and assigns different sub-bands to different functions (downlink, uplink, full duplex) within the same time slot. This segmentation allows simultaneous transmission and reception in different frequency portions, resolving the latency issue while maintaining spectrum efficiency.
Solution Approach 2:
The patent transitions from time-division multiplexing (single dimension) to frequency-division multiplexing with full duplex capability (adding frequency dimension). By utilizing both time and frequency dimensions simultaneously, the system achieves lower latency through parallel transmission while maintaining high spectrum efficiency.
2Loss of time
If FDD uses two separate frequency bands for transmitting and receiving data simultaneously, then uplink latency is reduced, but spectrum resources are wasted
Solution Approach 1:
The patent makes the same frequency band serve multiple functions by implementing full duplex operation in certain sub-bands, where the band simultaneously supports both downlink and uplink transmissions. This multi-functionality eliminates the need for dedicated separate bands, reducing spectrum waste while maintaining low latency.
Solution Approach 2:
The patent merges the downlink and uplink operations into the same time resources by using different sub-bands within the same carrier. This combining approach allows simultaneous transmission and reception, achieving low latency without the spectrum inefficiency of traditional FDD.
3Loss of time
If Sub-band Full Duplex enables simultaneous transmission and reception in the same slots, then uplink latency is reduced, but time domain conflicts in UE operations occur
Solution Approach 1:
The patent segments the carrier into multiple sub-bands with clearly defined functions (downlink, uplink, full duplex). This segmentation provides clear rules for UE operation in each sub-band, reducing the complexity of conflict management by eliminating ambiguity about which operation to perform when conflicts arise.
Solution Approach 2:
The patent introduces an intermediary indication mechanism (such as DCI formats or RRC configurations) that explicitly tells the UE which operation to perform in each sub-band. This intermediary signaling resolves time domain conflicts by providing clear operational guidance, reducing UE complexity while enabling full duplex benefits.
Data Source
AI summary
An aspect of the disclosure includes a method for, including: receiving at least one indication indicating at least one of a DL reception and a UL transmission; and performing the DL reception through a first resource or the UL transmission through a second resource according to a rule.