NTN SPS HARQ Feedback Control for Multicast Resource Efficiency
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Solution Overview
Problem
Existing wireless communication systems, particularly in Non-Terrestrial Networks (NTN), face challenges in optimizing Hybrid Automatic Repeat reQuest (HARQ) feedback mechanisms for Semi-Persistent Scheduling (SPS) configurations, especially in multicast broadcast services, leading to inefficiencies in resource allocation and data transmission reliability.
Innovation Solution
A method and system for UE and BS communication in NTN that enables or disables HARQ feedback for SPS configurations based on specific parameters, allowing for dynamic HARQ reporting modes, enhancing flexibility and efficiency in resource management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback is enabled for all SPS-configured PDSCH transmissions in NTN, then data transmission reliability is improved, but uplink resource consumption and network overhead increase
Solution Approach 1:
The patent changes the parameter state of HARQ feedback from always enabled to conditionally enabled/disabled based on RRC configuration parameters (harq-feedbackEnablingforSPSactive-r17). This allows the system to adapt the feedback mechanism to specific transmission scenarios, enabling reliable feedback when needed while conserving uplink resources when transmissions are robust or unnecessary feedback would waste resources.
Solution Approach 2:
The patent introduces dynamic control of HARQ feedback through RRC configuration that can be activated or deactivated. The network can dynamically switch between feedback-enabled and feedback-disabled states based on channel conditions, traffic patterns, and service requirements, optimizing the balance between reliability and resource consumption.
2Loss of energy
If HARQ feedback is disabled for SPS-configured PDSCH transmissions in NTN, then uplink resource consumption is reduced, but data transmission reliability deteriorates
Solution Approach 1:
The patent applies parameter changes by configuring the harq-feedbackEnablingforSPSactive-r17 parameter to control feedback behavior. When set to enable feedback, reliability is maintained; when disabled, resource consumption is reduced. This parameter-based control allows flexible adaptation to different operational requirements.
Solution Approach 2:
The system dynamically adjusts HARQ feedback behavior based on network conditions and service requirements through RRC configuration. The network can switch between feedback modes to optimize the trade-off between reliability and resource efficiency for different transmission scenarios.
3Device complexity
If fixed HARQ feedback mechanism is used for SPS in NTN, then system complexity is reduced, but adaptability to different service requirements deteriorates
Solution Approach 1:
The patent uses RRC parameters (harq-feedbackEnablingforSPSactive-r17 and harq-FeedbackOptionMulticast-r17) to configure different HARQ feedback behaviors for various service types. This parameter-based configuration allows the system to adapt to different service requirements (eMBB, mMTC, URLLC) without increasing fundamental system complexity.
Solution Approach 2:
The patent creates a universal HARQ feedback control mechanism that can serve multiple service types and scenarios through a single configurable framework. The same RRC configuration mechanism handles different service requirements, making the system versatile while maintaining manageable complexity.
4Reliability
If HARQ feedback is always reported for multicast PDSCH in NTN, then reception reliability is improved, but uplink signaling overhead increases
Solution Approach 1:
The patent changes the feedback reporting behavior through the harq-FeedbackOptionMulticast-r17 parameter, which can be configured to enable or disable HARQ feedback for multicast PDSCH. This allows the network to reduce uplink signaling overhead for multicast transmissions where feedback may not be critical, while maintaining reliability when needed.
Solution Approach 2:
The system dynamically controls HARQ feedback reporting for multicast services based on service requirements and channel conditions. The network can switch between feedback modes to optimize the balance between reception reliability and uplink signaling efficiency for multicast traffic.
Data Source
AI summary
A method, UE, and BS in an NTN is provided. The method includes receiving, from the BS, a first parameter, a second parameter, and a Semi-Persistent Scheduling (SPS) configuration, the first parameter indicating whether HARQ feedback is enabled for a first Physical Downlink Shared Channel (PDSCH) after an activation of the SPS configuration, and the second parameter indicating a HARQ reporting mode; receiving, from the BS, Downlink Control Information (DCI), the DCI triggering the activation of the SPS configuration; receiving, from the BS, the first PDSCH; determining to apply the first parameter, if both the first parameter and the second parameter are simultaneously configured, and the first parameter indicates that the HARQ feedback is enabled for the first PDSCH after the activation of the SPS configuration; and transmitting, to the BS, HARQ-ACK information for the first PDSCH, wherein the first PDSCH is associated with a Multicast Broadcast Service (MBS).