HARQ Process ID Segmentation for SPS and Non-SPS Signals
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, the existing methods face challenges in efficiently performing HARQ processes, especially when SPS and normal uplink data signals are scheduled simultaneously, and in switching between synchronous and asynchronous HARQ processes, leading to overlapping HARQ process IDs and increased latency.
Innovation Solution
A method where the user equipment (UE) sets HARQ process IDs for uplink data, distinguishing between SPS and non-SPS signals using specific equations and configurations, and switches between synchronous and asynchronous HARQ processes by adjusting retransmission timing and PHICH signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SPS and normal uplink data signals are scheduled at the same time using existing HARQ process methods, then resource utilization is improved, but HARQ process ID collisions occur and system reliability deteriorates
Solution Approach 1:
The patent segments the HARQ process ID space into distinct ranges for SPS signals and normal uplink data signals. Specifically, SPS signals are assigned HARQ process IDs from a first range (e.g., 0 to n-1) while normal uplink data signals are assigned IDs from a second range (e.g., n to 2n-1). This segmentation prevents ID collisions by ensuring that SPS and non-SPS signals operate in separate ID namespaces, thereby maintaining reliability while allowing simultaneous scheduling of both signal types.
2Device complexity
If synchronous HARQ process is used, then system complexity is reduced, but latency increases when switching to asynchronous HARQ process is needed
Solution Approach 1:
The patent implements dynamic HARQ process switching capability, allowing the system to transition between synchronous and asynchronous HARQ modes based on service requirements. The base station can configure the UE to switch from synchronous HARQ (lower complexity) to asynchronous HARQ (lower latency) by adjusting HARQ process parameters and timing configurations. This dynamic adaptation enables the system to optimize between complexity and latency trade-offs depending on real-time service needs.
3Ease of manufacture
If HARQ process ID range for SPS signals overlaps with normal uplink data signals, then configuration simplicity is maintained, but process identification accuracy deteriorates
Solution Approach 1:
The patent applies local quality by assigning different HARQ process ID characteristics to different signal types. Instead of using a uniform ID allocation scheme, the system configures specific ID ranges for SPS signals versus normal uplink data signals. This localized differentiation ensures that each signal type has its own identification namespace, improving identification accuracy while maintaining configuration simplicity through standardized range assignments defined in the patent.
Data Source
AI summary
A method for performing, by a terminal, an uplink HARQ process in a wireless communication system according to one embodiment of the present invention comprises the steps of: transmitting uplink data set to a first HARQ process ID; receiving an ACK/NACK response to the uplink data; and retransmitting the uplink data in response to the ACK/NACK response, wherein when the uplink data includes an SPS signal, the first HARQ process ID is set to one of values #0 to #n−1, and when the uplink data includes a non-SPS signal, the first HARQ process ID is set to one of values #n to #n+m−1, where n is the total number of HARQ processes that can be configured for the SPS signal, and m is the total number of HARQ processes that can be configured for the non-SPS signal.