DRX and HARQ State Signaling for NTN Channel Prioritization
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Solution Overview
Problem
Existing wireless communication systems in non-terrestrial networks (NTN) face challenges in efficiently managing discontinuous reception (DRX) and logical channel prioritization (LCP) due to the variability in hybrid automatic repeat request (HARQ) feedback states, leading to inefficiencies in resource allocation and user experience.
Innovation Solution
Adapting DRX and LCP based on downlink control information (DCI) and physical layer (L1) indications of HARQ feedback enablement or disablement, allowing wireless transmit/receive units (WTRUs) to adjust their reception patterns and channel prioritization accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If DRX operations are performed without adapting to HARQ feedback states, then power consumption is reduced through discontinuous reception, but resource utilization efficiency deteriorates due to inability to optimize reception patterns based on actual channel conditions
Solution Approach 1:
The patent applies dynamics by making DRX operations adaptive to changing HARQ feedback states. The WTRU dynamically adjusts its reception patterns based on whether HARQ feedback is enabled or disabled, transitioning from static DRX timing to dynamic DRX behavior that responds to real-time channel conditions and feedback availability.
Solution Approach 2:
The patent implements feedback mechanisms where the WTRU monitors HARQ feedback state information and uses this feedback to adjust its DRX operations. The system incorporates feedback loops that allow the WTRU to modify its reception behavior based on actual HARQ feedback conditions, enabling optimized power management.
2Reliability
If HARQ feedback is enabled for all processes, then reliability of data transmission is improved through retransmission mechanisms, but device complexity increases due to additional monitoring and control requirements
Solution Approach 1:
The patent applies local quality by enabling HARQ feedback selectively for specific HARQ processes rather than uniformly for all processes. The network can configure different feedback behaviors for different logical channels or data types, allowing high-reliability requirements to be met for critical data while reducing complexity for less critical transmissions.
Solution Approach 2:
The patent implements partial action by enabling HARQ feedback only for necessary HARQ processes rather than all processes. This selective approach allows the system to maintain reliability where needed while avoiding the excessive complexity of universal feedback implementation.
3Device complexity
If DRX timing is fixed without considering RTT variability in NTN, then implementation simplicity is maintained, but productivity deteriorates due to inefficient resource allocation in satellite communications
Solution Approach 1:
The patent applies parameter changes by adapting DRX timing parameters to account for RTT variability in non-terrestrial networks. The system modifies DRX configurations based on satellite orbit characteristics, signal propagation conditions, and measured RTT values, enabling optimized resource allocation for NTN environments.
Solution Approach 2:
The patent implements dynamics by making DRX timing adaptive rather than fixed. The system dynamically adjusts reception windows and timing parameters based on actual NTN propagation conditions, satellite movement, and measured round-trip times, transforming static DRX into dynamic behavior suited for satellite communications.
Data Source
AI summary
Methods, architectures, apparatuses, and systems directed to discontinuous reception (DRX) are described herein. In an embodiment, a method implemented in a wireless transmit/receive unit (WTRU) may include receiving configuration information indicating (1) a downlink control information (DCI)-based indication of hybrid automatic repeat request (HARQ) state and (2) a first HARQ state associated with a HARQ process. The method may include performing a first discontinuous reception (DRX) operation based on the first HARQ state. The method may include receiving a DCI and determining that the DCI may indicate a second HARQ state associated with the HARQ process, based on the configuration information indicating that DCI-based indication of HARQ state may be enabled. The method may include performing a second DRX operation associated with the HARQ process based on the second HARQ state.