NTN Channel Scheduling with HARQ Interval Constraints

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Solution Overview

Problem

In the 5G NR NTN system, the disabling of HARQ processes leads to potential out-of-order processing timing issues in terminal devices, necessitating enhanced scheduling restrictions to maintain order.

Innovation Solution

Implementing HARQ scheduling restrictions with defined time intervals for both uplink and downlink HARQ processes, ensuring that the time intervals between adjacent transmissions are greater than or equal to specific time lengths, thereby preventing out-of-order processing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If HARQ process is disabled to increase throughput and reduce RTT influence, then data transmission efficiency is improved, but out-of-order processing timing issues occur in terminal devices

Engineering Contradiction:

Improvedata transmission efficiencyVSAvoidprocessing timing order

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies preliminary action by establishing scheduling restrictions and time interval requirements before HARQ process disabling is fully implemented. The network device configures downlink scheduling restrictions in advance, and the terminal device prepares uplink scheduling restrictions beforehand, ensuring that timing order is maintained from the outset while enabling HARQ disabling for improved throughput.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes the parameter of time interval between adjacent PUSCH transmissions and between PDSCH transmissions and HARQ-ACK feedback. By adjusting these time interval parameters to meet specific requirements, the system maintains processing timing order even when HARQ process is disabled, thus resolving the contradiction between throughput and timing reliability.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If time interval between adjacent PUSCH transmissions is increased to ensure processing timing order, then reliability is improved, but transmission throughput is reduced

Engineering Contradiction:

Improveprocessing timing orderVSAvoidtransmission throughput

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies dynamics by making the time interval requirement adaptive rather than fixed. The network device dynamically adjusts downlink scheduling based on terminal device capabilities and channel conditions, while the terminal device dynamically determines uplink transmission timing. This dynamic adjustment allows the system to meet minimum time interval requirements for reliability while maximizing throughput opportunities.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent applies partial action by implementing time interval restrictions only where necessary to prevent out-of-order processing, rather than imposing uniform time limits on all transmissions. The scheduling restrictions are applied selectively to maintain timing order in critical scenarios while allowing more aggressive scheduling in other cases, thus balancing reliability and throughput.

Inventive Principle:

Principle #16Partial or excessive action

3Reliability

If downlink scheduling restrictions are enhanced to prevent out-of-order processing, then reliability is improved, but scheduling flexibility is reduced

Engineering Contradiction:

Improveprocessing timing orderVSAvoidscheduling flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent applies segmentation by dividing the scheduling restriction requirements into separate components: downlink scheduling restrictions configured by the network device and uplink scheduling restrictions determined by the terminal device. This segmentation allows each side to implement restrictions independently based on their specific requirements, maintaining scheduling flexibility while ensuring reliability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies feedback by having the terminal device provide feedback information to the network device about its processing capabilities and timing requirements. Based on this feedback, the network device adjusts downlink scheduling restrictions accordingly, maintaining scheduling flexibility while ensuring that processing timing order is preserved through adaptive restriction configuration.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12519575B2Channel transmission method, terminal device and network device

Publication Date: 2026.01.06 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

Provided are a channel transmission method, a terminal device and a network device. When an HARQ process is disabled, HARQ scheduling limitation is enhanced, thereby ensuring that the problem of disorder does not occur in a processing time sequence of a terminal device. The channel transmission method comprises: a terminal device transmitting a PUSCH by using a first uplink HARQ process, wherein the first uplink HARQ process corresponds to a first state, and a time interval between two adjacent PUSCH transmissions corresponding to the first uplink HARQ process is greater than or equal to a first duration.