Asynchronous PUSCH Resource Allocation for Latency Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing wireless communications systems face high PUSCH transmission latency and signaling overheads due to the four-step random access process, and inter-symbol interference occurs during asynchronous transmission of physical uplink shared channels (PUSCHs) through intra-slot frequency hopping by different user equipment.
Innovation Solution
A method that involves user equipment receiving time and frequency domain resource configuration information to determine non-consecutive time and frequency domain positions for the first and second hops of a PUSCH, ensuring that the frequency domain resources for these hops are different, thereby avoiding inter-symbol interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a four-step random access manner is used, then uplink synchronization is achieved, but PUSCH transmission latency and signaling overheads are high
Solution Approach 1:
The patent applies preliminary action by allowing user equipment to perform PUSCH transmission before uplink synchronization is completed. The UE determines time and frequency domain resources for asynchronous PUSCH transmission in advance, enabling data to be sent immediately when new uplink data arrives, without waiting for the completion of the four-step random access process. This reduces PUSCH transmission latency while maintaining the ability to achieve synchronization subsequently.
2Loss of time
If a two-step random access manner is used, then PUSCH transmission latency and signaling overheads are reduced, but inter-symbol interference occurs due to asynchronous transmission
Solution Approach 1:
The patent applies local quality by making the time and frequency domain resources specific to each user equipment's location and channel conditions. The network device determines and notifies each UE of dedicated time domain resource start positions and frequency domain resource configurations, creating localized resource allocations that prevent interference between different UEs while allowing asynchronous transmission. This enables the two-step random access benefits without the inter-symbol interference problem.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting time domain resource start positions and frequency domain resource configurations for different user equipments. The network device modifies these parameters based on channel conditions, UE locations, and traffic requirements, allowing flexible resource allocation that prevents inter-symbol interference while maintaining low latency. The parameters can be changed per UE and per transmission opportunity.
3Adaptability or versatility
If multiple user equipments asynchronously transmit PUSCHs through intra-slot frequency hopping, then transmission flexibility is improved, but inter-symbol interference is caused
Solution Approach 1:
The patent applies segmentation by dividing the time-frequency resource space into distinct segments for different user equipments. Each UE is allocated specific time domain resource start positions and frequency domain resource configurations, creating separated transmission segments that avoid overlap. This segmentation maintains transmission flexibility for each UE while preventing inter-symbol interference between multiple UEs performing intra-slot frequency hopping.
Data Source
AI summary
In a method for determining a resource of an asynchronous physical uplink shared channel PUSCH, user equipment (UE) receives time domain resource configuration information and frequency domain resource configuration information from a network device. The UE sets, based on the time domain resource configuration information, a time domain position of a first hop of a first PUSCH and a time domain position of a second hop of the first PUSCH to be inconsecutive in the time domain. The UE then determines a frequency domain position of the first hop of the first PUSCH and a frequency domain position of the second hop of the first PUSCH based on the frequency domain resource configuration information.