Parallel HARQ Uplink Combining for Low-Latency Decoding
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Solution Overview
Problem
In cellular communication systems, uplink transmission latency and quality are compromised due to time-varying channel characteristics and multipath fading, especially at cell edges, where HARQ processes struggle to ensure accurate data decoding.
Innovation Solution
The access network device simultaneously schedules and generates multiple HARQ processes to transmit identical uplink transmissions, combining them for improved decoding and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sequential HARQ scheduling is used, then device complexity is reduced, but transmission latency increases and data accuracy cannot be guaranteed
Solution Approach 1:
The patent segments the single sequential HARQ process into multiple parallel HARQ processes (first HARQ process and second HARQ process). Each process handles different transport blocks independently, allowing simultaneous transmission and combining operations. This segmentation enables parallel processing that reduces overall transmission latency while maintaining manageable device complexity through structured process division.
Solution Approach 2:
The patent transitions from one-dimensional sequential processing to two-dimensional parallel processing by introducing multiple HARQ processes operating simultaneously. The dimensionality change allows the system to perform combining operations across different process dimensions, reducing the time dimension (latency) while keeping device complexity manageable through organized process structures.
2Reliability
If retransmissions are performed within the same HARQ process, then reliability is maintained, but transmission latency increases
Solution Approach 1:
The patent merges multiple HARQ processes (first and second HARQ processes) at the combining stage, where soft combining is performed across processes. This merging allows the system to accumulate redundancy from multiple transmission attempts in parallel, improving reliability through combined decoding while reducing latency by avoiding sequential retransmission waits. The combining operation integrates information from different processes to achieve accurate data recovery.
3Loss of time
If multiple HARQ processes are used for parallel transmission, then transmission latency is reduced, but device complexity increases
Solution Approach 1:
The patent segments the HARQ system into distinct, independently managed processes with clear boundaries and responsibilities. Each HARQ process maintains its own state and handles specific transport blocks, which simplifies the management of complexity by organizing it into modular units. This segmentation allows parallel operation while keeping individual process complexity low and manageable.
Solution Approach 2:
The patent performs preliminary configuration of multiple HARQ processes with pre-defined parameters and combining rules before actual data transmission. The access network device pre-establishes the parallel process structures and combining mechanisms, so that during operation, the system can directly execute parallel transmissions without dynamic decision-making complexity. This preliminary setup reduces operational complexity while enabling low-latency parallel processing.
Data Source
AI summary
Aspects of the disclosure are directed to an uplink transmission method. The method can include receiving the same uplink transmission sent by a terminal by means of a plurality of HARQ processes, and combining uplink transmissions sent by the plurality of HARQ processes.