HARQ Feedback Latency Reduction in Short TTI Scheduling
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Solution Overview
Problem
In 5G wireless communication networks, the transmission of latency-sensitive services is hindered by increased HARQ feedback latency due to the scheduling of short TTIs within long TTIs, leading to wasted resources and prolonged transmission times.
Innovation Solution
The method involves interrupting long TTI data transmission to schedule short TTIs, allocating HARQ feedback resources for each short TTI, and configuring scheduling information within the long TTI to enable timely data transmission and feedback, thereby reducing latency and improving transmission flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If short TTIs are scheduled within long TTIs using the long TTI HARQ feedback resource, then resource configuration is simplified, but HARQ feedback latency increases and transmission efficiency deteriorates
Solution Approach 1:
The patent divides the single long TTI HARQ feedback resource into multiple short TTI-specific HARQ feedback resources. Each short TTI is assigned its own dedicated feedback resource, allowing independent and timely feedback transmission. This segmentation resolves the contradiction by eliminating the latency issue while maintaining manageable resource configuration through systematic allocation rules.
Solution Approach 2:
The patent implements dynamic HARQ feedback resource allocation where the feedback resource for each short TTI is determined based on the short TTI's position and timing within the long TTI structure. This dynamic allocation allows the system to adapt feedback resources to the specific scheduling requirements of each short TTI, reducing latency while keeping the overall resource management flexible and manageable.
2Device complexity
If long TTI is used for data transmission, then resource allocation is simplified, but transmission flexibility and response to latency-sensitive services deteriorate
Solution Approach 1:
The patent segments the long TTI into multiple short TTIs, each capable of independent scheduling and resource allocation. This segmentation allows the system to maintain the simplified overall resource framework of long TTI while enabling flexible, fine-grained resource allocation for individual short TTIs, thus resolving the contradiction between simplicity and flexibility.
Solution Approach 2:
The patent applies partial action by allowing only certain portions of the long TTI to be divided into short TTIs when latency-sensitive services are detected. The remaining portions can continue to use traditional long TTI allocation, thus gaining flexibility where needed while maintaining simplicity where not required, resolving the contradiction effectively.
3Device complexity
If HARQ feedback resource is allocated at the tail of long TTI, then resource management is simplified, but transmission time and resource utilization deteriorate
Solution Approach 1:
The patent segments the single feedback resource at the tail of long TTI into multiple feedback resources distributed throughout the long TTI structure, with each short TTI having its own dedicated feedback resource. This segmentation enables earlier and more distributed feedback transmission, improving resource utilization while maintaining systematic resource management through clear allocation rules.
Solution Approach 2:
The patent implements preliminary action by allocating HARQ feedback resources in advance for each short TTI based on predetermined rules, rather than waiting until the tail of the long TTI. This allows the system to prepare feedback resources beforehand, improving resource utilization efficiency while keeping resource management straightforward through pre-established allocation patterns.
Data Source
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AI summary
The present disclosure provides a method and an apparatus for obtaining HARQ feedback and transmitting HARQ feedback. The method of obtaining HARQ feedback includes: short TTI scheduling information is configured into a first target long TTI according to service requirements; the short TTI scheduling information is sent to second equipment through the first target long TTI; one or more short TTIs in a second target long TTI is scheduled according to the short TTI scheduling information and the scheduled one or more short TTIs are sent to the second equipment; and HARQ feedback for each of the one or more short TTIs which is sequentially sent by the second equipment within the second target long TTI is received. The method provided in the present disclosure may effectively shorten the HARQ feedback latency of short TTIs and improve the flexibility of data transmission.