Full-Duplex Multicast Scheduling With Active CFR Selection
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately configuring common frequency resources for multicast transmissions in full duplex slots, leading to potential inclusion of uplink resources and inefficient resource utilization.
Innovation Solution
The network and UE determine the active common frequency resource (CFR) for full duplex slots based on the resources configured for the slot type, ensuring accurate monitoring and reception of multicast messages by UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the CFR configuration is used as intended for half duplex slots, then the multicast message transmission can be simplified, but the CFR may include uplink resources leading to inaccurate reception by UEs in full duplex slots
Solution Approach 1:
The system dynamically determines the active CFR for full duplex slots by identifying overlapping resources between the configured CFR and downlink bandwidth parts, rather than using a static CFR configuration. This dynamic adjustment ensures the CFR accurately reflects available downlink resources in full duplex operation.
Solution Approach 2:
The patent changes the parameter of CFR selection based on slot type. For full duplex slots, the system selects CFRs that overlap with downlink bandwidth parts, while for half duplex slots, the configured CFR is used directly. This parameter change resolves the contradiction by adapting the CFR selection method to the specific operational mode.
2Productivity
If the CFR includes uplink resources for full duplex slots, then the frequency resource utilization is increased, but the multicast message reception reliability is degraded
Solution Approach 1:
The system extracts only the relevant downlink portion from the full duplex slot resources to determine the active CFR. By taking out only the overlapping resources that are actually available for downlink transmission, the system ensures reliable multicast reception while still utilizing available frequency resources efficiently.
Solution Approach 2:
The patent applies local quality by treating different parts of the frequency spectrum differently. Within the full duplex slot, only the frequency resources that overlap with downlink bandwidth parts are considered for multicast transmission, while uplink resources are excluded. This localized approach ensures reliability in the relevant frequency region.
3Measurement precision
If the network indicates CFR configuration through RRC signaling, then the configuration accuracy is improved, but the signaling complexity and time overhead are increased
Solution Approach 1:
The system performs preliminary determination of the active CFR by pre-configuring the CFR and downlink bandwidth parts, then having the UE independently determine the overlap. This preliminary setup reduces the need for complex real-time signaling while maintaining configuration accuracy.
Solution Approach 2:
The UE performs self-service by independently determining the active CFR through local calculation of overlapping resources between the configured CFR and downlink bandwidth parts. This self-determination mechanism reduces signaling complexity while maintaining accuracy.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Techniques described herein relate to transmission of a multicast message via a common frequency resource (CFR) in a full duplex slot. The CFR may be positioned within the downlink bandwidth parts (BWP)s configured for a group of user equipments (UE)s such that each UE in the group may monitor for and receive the multicast message. The network may indicate the frequency position of the CFR to the group of UEs. The frequency resources (e.g., the resource blocks) configured for downlink for a UE may be different between half duplex slots and full duplex slots. The network and the UE may determine the active CFR for a full duplex slot based on the resources configured for the full duplex slot. The UE may monitor for and receive a multicast transmission in the active CFR in the full duplex slot.