Chained Sidelink Transmissions Reduce Latency

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Solution Overview

Problem

Wireless communication systems face latency and inefficiencies due to both user equipment (UE) performing resource reservation processes during sidelink transmissions, especially in scenarios like vehicle-to-everything (V2X) and Internet of Things (IoT) applications, where multiple UEs compete for shared resources.

Innovation Solution

Implementing chained sidelink transmissions where a transmitting UE reserves resources for both its own and the receiving UE's transmissions using a single sidelink control information (SCI) message, allowing the receiving UE to respond without re-reserving resources, thereby reducing latency and signaling overhead.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If both transmitting UE and receiving UE perform resource reservation processes, then resource allocation reliability is improved, but communication latency increases

Engineering Contradiction:

Improveresource allocation reliabilityVSAvoidcommunication latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent merges the resource reservation function into a single process performed by the transmitting UE. The transmitting UE sends SCI that reserves resources for both its own transmission and the receiving UE's response transmission, eliminating the need for the receiving UE to perform separate resource reservation. This combines two reservation processes into one, reducing latency while maintaining reliability through pre-allocated resources.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The transmitting UE performs preliminary action by reserving resources for the receiving UE's response transmission in advance, before the receiving UE actually transmits. The SCI message includes resource allocation information for the response transmission, so when the receiving UE receives the data, it already has pre-allocated resources ready, eliminating the need for real-time resource reservation and reducing latency.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If both UEs perform resource reservation processes, then resource allocation completeness is improved, but signaling overhead increases

Engineering Contradiction:

Improveresource allocation completenessVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The patent combines multiple reservation signals into a single SCI message. The transmitting UE's SCI includes both its own resource reservation information and the receiving UE's resource reservation information, merging what would traditionally be two separate signaling processes into one, thereby reducing signaling overhead while maintaining complete resource allocation.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The SCI message performs multiple functions simultaneously: it reserves resources for the transmitting UE's data transmission, reserves resources for the receiving UE's response transmission, and conveys data from the transmitting UE to the receiving UE. This multi-functional approach eliminates redundant signaling while ensuring complete resource allocation for both directions.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If receiving UE performs resource reservation for response transmission, then resource conflict avoidance is improved, but communication efficiency decreases

Engineering Contradiction:

Improveresource conflict avoidanceVSAvoidcommunication efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The transmitting UE performs preliminary resource reservation for the receiving UE's response transmission by including resource allocation information in the SCI message. This preliminary action ensures that when the receiving UE needs to transmit a response, resources are already reserved and conflict-free, eliminating the need for the receiving UE to perform additional reservation procedures and thereby improving communication efficiency.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The transmitting UE acts as an intermediary by allocating and reserving resources for the receiving UE's response transmission on behalf of the receiving UE. The SCI message serves as a mediator that carries both the data from the transmitting UE and the resource reservation information for the receiving UE's response, streamlining the communication process and improving efficiency.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS11589335B2Chained sidelink transmissions

Publication Date: 2023.02.21 QUALCOMM INC

AI summary

Methods, systems, and devices for wireless communications are described. The described techniques relate to improved methods, systems, devices, and apparatuses that support chained sidelink transmissions. A transmitting user equipment (UE) may send, to a receiving UE, sidelink control information (SCI) that reserves resources for transmission from the transmitting UE as well as reserves resources for a response transmission from the receiving UE. The receiving UE may respond with a transmission using the resources that were reserved in the SCI and without sending its own SCI to reserve resources for the response. The latency between the transmitting UE sending the first transmission and receiving a response from the receiving UE may be reduced, because the transmitting UE reserved the resources for itself and the receiving UE with the same SCI.