HARQ Process Group Coordination for Fronthaul Latency
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Solution Overview
Problem
The existing hybrid automatic repeat request (HARQ) systems in LTE and 4G communication technologies face inefficiencies due to latency in the fronthaul network, leading to reduced throughput and idle periods for wireless communication layers and user equipment.
Innovation Solution
A hybrid automatic repeat request system with multiple HARQ process groups and a coordinator that selects the appropriate HARQ process group for data transmission and retransmission based on feedback signals, using a new data indicator and last used process code to manage data packets and reduce latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fronthaul network latency is present, then data transmission reliability is maintained, but throughput decreases and idle periods increase
Solution Approach 1:
The patent segments the HARQ processes into multiple groups (first HARQ process group and second HARQ process group) with different timing configurations. This allows simultaneous operation of multiple HARQ processes with different latency tolerances, enabling the system to maintain continuous data transmission while accommodating fronthaul network latency constraints.
Solution Approach 2:
The patent introduces a new dimension of HARQ process management by creating parallel HARQ process groups with different timing advances. This dimensional expansion allows the system to operate multiple HARQ processes concurrently with different temporal characteristics, effectively bypassing the bottleneck caused by fronthaul latency.
2Reliability
If fronthaul network latency occurs, then data transmission can proceed, but wireless communication layer and user equipment must remain idle
Solution Approach 1:
The patent divides HARQ processes into multiple groups that can operate independently with different timing configurations. This segmentation allows the system to maintain reliable data transmission through some HARQ processes while others adapt to latency conditions, preventing complete idle periods.
Solution Approach 2:
The patent changes the timing parameters of different HARQ process groups, specifically using different timing advance values for the first and second HARQ process groups. This parameter differentiation allows simultaneous operation with optimized throughput while maintaining transmission reliability.
3Device complexity
If central processing unit has low processing speed, then system complexity is reduced, but latency increases and throughput decreases
Solution Approach 1:
The patent segments processing tasks across multiple HARQ process groups that can be handled by different processing units. This segmentation allows distributed processing, reducing the burden on any single central processing unit while maintaining overall system throughput.
Solution Approach 2:
The patent introduces HARQ process groups as intermediary structures that manage data transmission tasks. These intermediaries distribute processing requirements across multiple parallel processes, reducing the immediate processing load on the central processing unit while maintaining throughput through parallel operation.
Data Source
Figure 1A~1B
Figure 1C~2A
Figure 2B~3
AI summary
A hybrid automatic repeat request method comprises selecting a first HARQ process group from HARQ process groups to send a first data packet, recognizing that a feedback signal corresponds to a first HARQ process in the first HARQ process group according to the feedback signal and the time of receiving the feedback signal, determining whether the last used HARQ process in the first HARQ process group is identical to the first HARQ process when the first data packet is decoded incorrectly, instructing the first HARQ process to transmit the first data packet when the two processes are different, and instructing the first HARQ process to transmit a second data packet or the first data packet when the two processes are identical, wherein the first data packet is based on a whole of the raw data, and the second data packet is based on a part of the raw data.