Virtual UE Uplink Control Grouping for Cross-Carrier Scheduling
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Solution Overview
Problem
Interference in wireless communication networks due to increased demand for mobile broadband access and deployment of more user equipments (UEs) degrades performance on both downlink and uplink, necessitating improved communication techniques for cooperative user equipment (UE) capabilities.
Innovation Solution
Implementing uplink control channel group and cross-carrier scheduling for cooperative communications of member UEs of a virtual UE, where UEs report cooperative configurations and associations between component carriers, receive uplink control transmission configuration messages, and assign CCs into sets for efficient scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional uplink control channel allocation is used for each UE individually, then each UE can transmit control information independently, but the network experiences increased interference and congestion as the number of UEs grows
Solution Approach 1:
Multiple UEs are merged into a virtual UE entity that shares a common uplink control channel. Instead of each UE having its own dedicated control channel, the virtual UE aggregates control information from multiple member UEs and transmits it through a single shared control channel, thereby reducing the total number of control channel transmissions and decreasing interference in the uplink control channel region.
Solution Approach 2:
The virtual UE structure enables a single uplink control channel to serve multiple UEs simultaneously. The control channel becomes universal by carrying aggregated control information from all member UEs, allowing one channel to perform the function that would traditionally require multiple separate channels.
2Adaptability or versatility
If cross-carrier scheduling is implemented to manage multiple component carriers, then resource allocation flexibility improves, but scheduling complexity and processing overhead increase
Solution Approach 1:
The virtual UE is divided into multiple member UEs, each associated with specific component carriers. The scheduling mechanism is segmented by grouping component carriers into sets, where each set is scheduled independently through cross-carrier scheduling. This segmentation allows flexible resource allocation across different carrier sets while managing complexity through structured organization.
Solution Approach 2:
The system performs preliminary configuration of the virtual UE structure, including identification of member UEs, association of component carriers with member UEs, and configuration of uplink control transmission groups. This preliminary setup enables efficient cross-carrier scheduling operations to proceed without complex real-time processing, as the scheduling relationships are pre-established.
3Reliability
If each member UE waits for decoding from different UE groups before transmitting acknowledgement signaling, then complete information exchange is ensured, but transmission time is extended
Solution Approach 1:
The system performs preliminary grouping of component carriers into sets and associates these sets with specific uplink control transmission groups. This preliminary organization allows member UEs to transmit acknowledgement signaling in a structured manner without waiting for complete decoding from all UE groups, as the scheduling message indicates which component carrier sets have been successfully decoded based on the pre-configured groups.
Solution Approach 2:
The scheduling message includes feedback information indicating which component carrier sets have been successfully decoded by member UEs. This feedback mechanism allows the system to optimize subsequent transmissions by focusing only on the remaining undecoded sets, eliminating the need for member UEs to wait for complete information exchange from all groups before transmitting their acknowledgement signaling.
Data Source
AI summary
Uplink control channel group and cross-carrier scheduling is disclosed for cooperative communications of a virtual UE. In an aspect, a UE reports a cooperative configuration with member UEs of a virtual UE and reports associations between a plurality of component carriers (CCs) allocated to a cell group and each member UE of the virtual UE. The UE may then receive an uplink control transmission configuration message dividing each member UE into an assigned uplink control transmission group and assign one or more component CCs into one or more CC sets, wherein each CC set is assigned to each uplink control transmission group. The UE may receive an uplink scheduling message from a serving base station, wherein the uplink scheduling message includes an uplink schedule for CCs within the CC set assigned to an uplink control transmission group associated with the UE. Other aspects and features are also claimed and described.