HARQ Process State-Based Resource Selection for NTN QoS
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Solution Overview
Problem
In non-terrestrial networks (NTN), the large transmission delay between terminal devices and network devices poses challenges in satisfying quality of service (QoS) requirements for different services, particularly due to resource conflicts between configured grant (CG) and dynamic grant (DG) resources, which can lead to inadequate selection of HARQ processes.
Innovation Solution
The solution involves determining the target resource for data transmission based on the enable/disable states of HARQ processes corresponding to available resources, ensuring that the selected resource aligns with the QoS demands of the service, thereby optimizing transmission performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the terminal device preferentially selects DG resource for data transmission according to existing protocol, then resource conflict is resolved, but service QoS requirement cannot be satisfied due to different HARQ process enable states
Solution Approach 1:
The patent applies local quality by making the resource selection behavior dependent on the specific HARQ process configuration. Different HARQ processes have different enable states (first part enabled, second part disabled), and the terminal device selects resources based on which HARQ process is being used. This localized adaptation to different HARQ process states resolves the contradiction between following existing protocols and satisfying service QoS requirements.
Solution Approach 2:
The patent introduces dynamic resource selection based on HARQ process states. Instead of a static protocol-based selection, the terminal device dynamically determines which resource to use based on whether the corresponding HARQ process is in the first part (enabled) or second part (disabled). This dynamic adaptation allows the system to satisfy different service QoS requirements while still resolving resource conflicts.
2Reliability
If HARQ feedback function is enabled for all HARQ processes, then transmission reliability is improved, but transmission delay increases due to feedback waiting
Solution Approach 1:
The patent segments the HARQ processes into two parts: a first part with HARQ feedback enabled and a second part with HARQ feedback disabled. This segmentation allows different services to use appropriate HARQ configurations - time-sensitive services can use the second part (no feedback, lower delay) while services requiring high reliability can use the first part (feedback enabled, higher reliability). This resolves the contradiction between reliability and delay by providing differentiated HARQ behavior.
Solution Approach 2:
The patent changes the HARQ feedback parameter for different HARQ processes. By configuring some HARQ processes with feedback enabled and others with feedback disabled, the system can adjust the transmission characteristics to match service requirements. This parameter variation allows the system to optimize for either reliability or delay depending on the service type, resolving the inherent trade-off.
3Loss of time
If HARQ feedback function is disabled for all HARQ processes, then transmission delay is reduced, but transmission reliability deteriorates
Solution Approach 1:
The patent segments HARQ processes into two groups with different feedback configurations. The first part has feedback enabled for reliable transmission, while the second part has feedback disabled for low-delay transmission. This segmentation resolves the contradiction by allowing the system to choose the appropriate HARQ mode based on service requirements rather than applying a uniform configuration to all processes.
Solution Approach 2:
The patent varies the HARQ feedback parameter across different HARQ processes to match different service needs. Services requiring low delay can utilize HARQ processes with feedback disabled, while services requiring high reliability can use processes with feedback enabled. This parameter differentiation resolves the contradiction between delay and reliability by providing service-specific optimization.
Data Source
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AI summary
Embodiments of the present application provide a data transmission method and apparatus, and a device, the method includes: a first device determining a target resource from multiple available resources according to states of HARQ processes corresponding to the multiple available resources respectively, and sends data to a second device on the target resource, and the second device receives the data on the target resource and processes the data. Transmission performance of services with different requirements can be ensured.