Wireless Resource Reservation for Adaptive V2X Sidelink Scheduling
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in resource allocation for half-duplex UEs, particularly in vehicle-to-everything (V2X) systems, leading to collisions and interference due to fixed resource allocation sizes that do not adapt to varying data packet sizes.
Innovation Solution
Implementing a dynamic resource scheduling scheme with resource reservation signals (RRS) that allow UEs to decode upcoming transmissions, maintain a resource map, and select resources based on interference avoidance mechanisms, using differentiated encoding for RRS and V2X transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed resource allocation sizes are used for periodic resource assignment, then resource management is simplified, but scheduling efficiency deteriorates due to inability to adapt to varying data packet sizes
Solution Approach 1:
The patent implements dynamic resource allocation where the size of resource allocations is no longer fixed but adapts based on the actual data packet size. The network device determines appropriate resource allocation sizes dynamically for each periodic assignment, allowing the system to adjust resource usage according to actual needs rather than following a rigid fixed-size scheme.
2Reliability
If periodic resource assignment is used for half-duplex UEs, then interference between incoming and outgoing transmissions is avoided, but resource utilization efficiency deteriorates due to inability to accommodate varying packet sizes
Solution Approach 1:
The system maintains periodic resource assignment for half-duplex UEs to prevent interference, but enhances it with dynamic resource allocation capabilities. The network device can now adjust the size of allocated resources within each periodic assignment based on the actual data packet size, allowing the system to maintain reliability while improving resource utilization efficiency.
3Ease of operation
If fixed size resource allocations are assigned, then resource allocation process is simplified, but adaptability deteriorates for varying data packet sizes
Solution Approach 1:
The patent transitions from static fixed-size resource allocations to dynamic resource allocations that automatically adapt to varying data packet sizes. The network device determines appropriate allocation sizes based on actual packet requirements, maintaining operational simplicity through automated determination while achieving adaptability to different packet sizes.
4Reliability
If resources are reserved periodically for multiple UEs, then collision avoidance is improved, but signaling overhead increases due to repeated resource reservation signals
Solution Approach 1:
The system uses periodic resource assignment to maintain collision avoidance, but reduces signaling overhead by efficiently managing resource reservation signals. The network device optimizes the periodicity and content of RRS transmissions, sending updates only when necessary rather than continuously, thereby maintaining reliability while reducing the frequency and volume of signaling messages.
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described in which a transmitting user equipment (UE) may determine a data packet to transmit to another UE and determine a set of candidate resources for transmission of the data packet based on a set of time-frequency resources that are allocated for UE-to-UE communications. A resource reservation signal (RRS) may be transmitted to indicate to other UEs that the set of candidate resources have been reserved by a UE. The RRS may be transmitted such that the RRS may be differentiated from other regular transmissions based at least in part on information provided by a control channel associated with the RRS or a payload of a transmission that includes the RRS. The RRS may indicate one or more of a size of an allocation of the resources and multiple locations of the resources within a time-frequency resource pool.