Sidelink Resource Pool Subslot Configuration for Low Latency
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Solution Overview
Problem
Current wireless communication systems face challenges in achieving low latency for sidelink communications due to slot-based scheduling, which results in high round-trip times and inefficiencies in spectral usage, especially when supporting large packet sizes and diverse latency and reliability requirements.
Innovation Solution
The implementation of a sidelink resource pool configuration that includes a control region and a set of contiguous subslots for data channels within each slot, allowing for flexible resource allocation and autonomous scheduling by user equipment (UEs) to reduce latency and improve spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If slot-based scheduling is used for sidelink communications, then resource allocation is simplified and standardized, but latency increases and spectral efficiency deteriorates
Solution Approach 1:
The slot structure is segmented into a control region and multiple data regions, with further division into subslots for data transmission. This segmentation allows independent optimization of control and data regions, enabling low-latency data transmission while maintaining standardized control procedures.
Solution Approach 2:
The patent introduces dynamic resource allocation where the number and position of subslots within a slot can be flexibly configured based on traffic requirements. This dynamic structure allows the system to adapt to varying latency requirements while maintaining the overall slot-based framework.
2Device complexity
If slot-based scheduling is used for sidelink communications, then resource management is standardized, but spectral efficiency decreases
Solution Approach 1:
The slot is divided into multiple subslots, each capable of carrying data transmissions. This allows more granular utilization of time resources, reducing idle gaps between transmissions and improving spectral efficiency while maintaining standardized slot-based resource management.
Solution Approach 2:
The patent allows dynamic adjustment of subslot parameters including the number of subslots per slot, subslot duration, and resource allocation patterns. These parameter changes enable optimization of spectral efficiency for different traffic types while maintaining compatibility with standardized resource management procedures.
3Reliability
If gap symbols and automatic gain control symbols are included in slot structure, then signal synchronization and reception are improved, but available data transmission resources are reduced
Solution Approach 1:
The patent extracts and consolidates gap symbols and automatic gain control symbols into dedicated control regions at the beginning of slots or subslots. This separation allows these essential signaling functions to be performed efficiently while maximizing the remaining time resources for data transmission in the data regions.
Solution Approach 2:
Automatic gain control and synchronization operations are performed in advance during the control region before data transmission begins in the data regions. This preliminary action ensures that signal reception is optimized before data arrives, eliminating the need for repeated gap symbols throughout the transmission and preserving data transmission capacity.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described related to a slot format for low latency sidelink communications. A group of user equipments (UEs) may receive an indication of a configuration of a sidelink resource pool. The sidelink resource pool may include one or more slots and one or more subchannels, and a slot of the sidelink resource pool may include a control region allocated for a sidelink control channel and a set of contiguous subslots each allocated for a sidelink data channel. A first UE may transmit sidelink control information (SCI) to a second UE in the control region of a slot to reserve one or more subslot of the same slot or any quantity of different slots for a sidelink message. The first UE may transmit the sidelink message to the second UE in the subslot.