Sidelink Carrier Aggregation with Capability-Aware Scheduling
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently configuring sidelink carrier frequencies for carrier aggregation (CA) due to the lack of knowledge about peer UE capabilities, especially in groupcast and broadcast scenarios, leading to difficulties in resource allocation and HARQ feedback for sidelink communication.
Innovation Solution
Implementations enable UEs to determine and configure sidelink carrier frequencies using cell-specific and UE-specific signaling, including ARFCN-based indexing and mapping, to facilitate cross-carrier scheduling and HARQ reporting, allowing efficient resource allocation and communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UEs attempt to configure sidelink carrier frequencies for carrier aggregation without knowledge of peer UE capabilities, then resource allocation efficiency deteriorates, but implementing capability exchange signaling increases system complexity
Solution Approach 1:
The network node acts as an intermediary that collects capability information from UEs and distributes appropriate configuration parameters. The network node receives capability information from UEs, determines suitable sidelink carrier frequencies based on this information, and provides configurations to UEs, thereby enabling efficient resource allocation without direct UE-UE capability exchange
Solution Approach 2:
UEs provide feedback to the network node about their capability information, which the network node uses to determine appropriate sidelink carrier frequencies. This feedback mechanism enables the network to make informed allocation decisions that match UE capabilities without requiring complex direct UE-UE negotiation
2Productivity
If multiple sidelink carrier frequencies are aggregated to increase data rates, then communication performance improves, but synchronization and resource management complexity increases
Solution Approach 1:
The network node performs preliminary determination of suitable sidelink carrier frequencies based on UE capabilities before configuring carrier aggregation. By pre-selecting compatible frequencies and establishing synchronization parameters in advance, the network reduces the complexity of real-time synchronization management across multiple carriers
Solution Approach 2:
The synchronization mechanism designed for single-carrier operation is extended to multi-carrier operation by the network node providing unified synchronization configurations. The same synchronization principles apply across all aggregated carriers, reducing the need for separate synchronization mechanisms for each carrier
3Adaptability or versatility
If cross-carrier scheduling is implemented for sidelink CA to improve resource utilization, then resource allocation flexibility improves, but scheduling and HARQ feedback complexity increases
Solution Approach 1:
The network node serves as an intermediary that manages cross-carrier scheduling configurations. It provides scheduling parameters and HARQ feedback configurations that enable UEs to perform cross-carrier scheduling without implementing complex peer-UE negotiation mechanisms, centralizing the complexity management at the network side
Data Source
AI summary
Various aspects of the present disclosure relate to implementations of CA for sidelink communication are described. Techniques are described for determining and configuring sidelink carrier frequencies for cross-carrier scheduling for sidelink CA communication. For instance, cell-specific and/or UE-specific scheduling of carrier frequencies for CA may be implemented. Implementations also enable sidelink HARQ reporting to wireless networks for providing indications of sidelink CA performance.