HARQ Feedback Determination for Multi-BWP NR Systems
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Solution Overview
Problem
In new radio (NR) technology, the limited RF bandwidth capability of terminal devices compared to carrier bandwidths poses challenges for reliable and accurate data transmission, particularly in configuring bandwidth parts and hybrid automatic repeat request (HARQ) feedback mechanisms.
Innovation Solution
A method is proposed to determine the quantity of downlink control channel monitoring occasions for HARQ feedback information based on K time sequence relationships, ensuring unified understanding between wireless network devices and terminal devices, thereby improving system robustness by configuring multiple downlink frequency domain resources and considering subcarrier spacing differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple downlink frequency domain resources are configured with different subcarrier spacings, then the adaptability to different service requirements is improved, but the complexity of determining HARQ feedback quantity and monitoring occasions increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting subcarrier spacing values across different downlink frequency domain resources (bandwidth parts) to match specific service requirements. The system configures multiple BWPs with different subcarrier spacing parameters (e.g., 15kHz, 30kHz, 60kHz) and activates appropriate BWPs based on service type, thereby achieving adaptability while managing complexity through parameterization.
Solution Approach 2:
The patent implements universality by creating a unified HARQ feedback determination mechanism that works across multiple downlink frequency domain resources with different configurations. The terminal device and network device use a common rule set (based on K1 values and monitoring occasion relationships) to determine HARQ feedback quantity regardless of which BWP is active, making the system multi-functional and adaptable to various service scenarios without requiring separate feedback mechanisms for each configuration.
2Adaptability or versatility
If different subcarrier spacings are used in different bandwidth parts, then the service requirement matching is improved, but the consistency of communication understanding between network device and terminal device deteriorates
Solution Approach 1:
The patent uses parameter changes by configuring different subcarrier spacing values in different bandwidth parts to match specific service requirements (e.g., larger spacing for low-latency services, smaller spacing for high-throughput services). Each BWP is assigned appropriate subcarrier spacing parameters that optimize performance for its intended service type.
Solution Approach 2:
The patent applies feedback mechanisms where the terminal device sends HARQ feedback information back to the network device based on downlink data reception status. The feedback quantity and timing are determined using unified rules (K1 values, monitoring occasion relationships) that ensure both network device and terminal device have consistent understanding, even when different BWPs with different subcarrier spacings are involved. This feedback loop maintains communication consistency across varying configurations.
3Reliability
If a unified rule for determining HARQ feedback quantity is established across multiple frequency domain resources, then the system robustness is improved, but the flexibility in handling different subcarrier spacing configurations decreases
Solution Approach 1:
The patent implements universality by establishing a unified HARQ feedback determination mechanism that operates consistently across multiple downlink frequency domain resources with different subcarrier spacing configurations. The same rules (based on K1 values, monitoring occasion relationships, and BWP activation states) apply regardless of which BWP is active, providing system robustness through consistent behavior while handling diverse configurations.
Solution Approach 2:
The patent balances unity and flexibility by using parameter-based configurations. While the determination rule structure remains unified, the actual parameters (subcarrier spacing values, BWP configurations, K1 sets) can be changed to adapt to different service requirements. The unified rule framework accommodates parameter variations without requiring different feedback mechanisms, thus maintaining both robustness and flexibility.
Data Source
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AI summary
This application provides a feedback method, an apparatus, and a system, and relates to the field of communications technologies. The method includes: receiving, by a terminal device, configuration information sent by a network device, where the configuration information is used to indicate K time sequence relationships, the K time sequence relationships are respectively used for HARQ feedback on K downlink frequency domain resources, and K is a positive integer greater than or equal to 2; and sending, by the terminal device, HARQ feedback information to the network device, where a quantity of downlink control channel monitoring occasionsmonitoring occasions corresponding to the HARQ feedback information is determined based on the K time sequence relationships. According to the foregoing solution, the network device and the terminal device have a unified understanding on the HARQ feedback information. In this way, system robustness is improved.