V2X Resource Reservation With Slot Aggregation to Avoid Collisions
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Solution Overview
Problem
Wireless communications systems face inefficiencies due to half-duplex UEs causing collisions and interference on resources, particularly in vehicle-to-everything (V2X) systems, where resource allocation is inefficient and performance suffers from fixed resource sizes not matching varying packet sizes.
Innovation Solution
Implementing dynamic resource reservation techniques using slot aggregation and resource avoidance mechanisms, allowing UEs to select and reserve resources based on latency types and avoiding occupied resources, with UEs updating resource maps to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If resources are assigned periodically to UEs, then resource allocation is simplified, but resource utilization efficiency deteriorates due to fixed resource sizes not matching varying packet sizes
Solution Approach 1:
The patent implements dynamic resource allocation where UEs can select resources based on actual packet size requirements rather than fixed periodic assignments. The resource selection process allows UEs to adaptively choose time-frequency resources matching their data transmission needs, transforming the static resource allocation into a dynamic system that responds to varying traffic conditions.
Solution Approach 2:
The system changes the parameter of resource allocation from fixed periodic time intervals to flexible resource selections based on packet size. UEs can adjust the number and duration of resources allocated according to the actual data volume, enabling the resource allocation parameters to vary dynamically rather than remaining constant.
2Quantity of substance
If multiple UEs share available system resources, then system capacity increases, but resource collisions and interference increase
Solution Approach 1:
The patent implements a preliminary resource reservation mechanism where UEs declare their intended resource usage in advance through scheduling requests and uplink grants. This preliminary action allows the system to coordinate resource allocations before actual transmission occurs, preventing collisions by ensuring that multiple UEs do not simultaneously select the same resources.
Solution Approach 2:
The system employs feedback mechanisms where UEs receive scheduling decisions from the base station based on their resource requests. The base station monitors resource usage and provides feedback through uplink grants that allocate specific resources to individual UEs, creating a closed-loop control system that adjusts resource allocation based on current system conditions and prevents interference.
3Device complexity
If UEs operate in half-duplex mode, then device complexity is reduced, but transmission reliability deteriorates due to inability to transmit and receive simultaneously
Solution Approach 1:
The patent segments the transmission process into distinct phases: a preamble transmission phase followed by a data transmission phase. During the preamble phase, UEs transmit only (no reception), and during the data phase, the timing and resources are carefully coordinated so that UEs transmit and receive in separate time intervals. This temporal segmentation allows half-duplex UEs to operate reliably without simultaneous transmit-receive conflicts.
Solution Approach 2:
The system employs periodic action by organizing communications into structured time intervals with predetermined patterns. UEs follow a periodic schedule where they transmit preambles at specific intervals and receive data at designated times, creating a rhythmic communication pattern that prevents half-duplex conflicts while maintaining reliable transmission.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described that provide for dynamic resource avoidance and slot aggregation. The described techniques enable a user equipment (UE) in a vehicle-to-everything (V2X) system to select resources for varying transmission of a data packet (e.g., over multiple slots). The UE may determine a set of candidate transmission time intervals (TTIs) for transmission of the data packet based on a resource map, which may involve selecting resources that are unoccupied by other UEs as indicated by the resource map or preempting other UEs based on traffic priority or latency. The UE may transmit a reservation indication indicating resources to be reserved for subsequent transmissions (e.g., retransmission) and a UE receiving the reservation indication may update its resource map.