NR-V2X Mode 2 in ns-3

In 5G NR-V2X, vehicles communicate directly using sidelink. Two modes exist:

  • Mode 1: gNB schedules sidelink resources.
  • Mode 2: UEs autonomously select sidelink resources (no gNB needed).

Mode 2 is especially important for vehicular networks (IoV), where cars must exchange safety messages without relying on infrastructure.

In ns-3, the NrHelper class is used to:

  • Create UE devices with sidelink PHY/MAC layers.
  • Attach them to Bandwidth Parts (BWPs) and spectrum channels.
  • Configure sidelink attributes such as:
    • SidelinkMode = 2 (autonomous)
    • SidelinkPeriod (resource pool periodicity)
    • SidelinkSubchannelSize (RB grouping)

Comments

Post a Comment

Popular posts from this blog

From DSRC to 5G NR-V2X: The Road Ahead for Connected Vehicles

Modern vehicles are no longer just machines on wheels. Through Vehicle-to-Everything (V2X) communication , they are becoming active participants in intelligent transport systems, enabling safer driving, smoother traffic, and progress toward automation. DSRC: The First Step The earliest V2X technology was Dedicated Short-Range Communications (DSRC) , based on IEEE 802.11p. Operating in the 5.9 GHz band , it allowed onboard units (OBUs) in vehicles to exchange safety and infotainment data with roadside units (RSUs) . While DSRC was effective for short-range messaging, it faced limits in coverage, data rate, and quality of service (QoS) . These challenges motivated researchers to explore new solutions. D2D and the Cellular Shift A key breakthrough came with Device-to-Device (D2D) communication , where vehicles exchange information directly without always relying on infrastructure. This reduces latency, eases network congestion, and helps maintain reliability in crow...
Read more

CTE 311: ENGINEER IN SOCIETY: CURRICULUM (20/21 SESSION)

GENERAL OBJECTIVES: On completion of this module, the student should be able to: 1. Understand the historical development of engineering and technology. 2. Know the cadres and pyramidal structure of the engineering family. 3. Understand roles of engineering personnel in the society. 4. Know the engineering professional associations in Nigeria. 5. Understand importance and process of engineering professional registration in Nigeria. 1.1 Identify, describe, technology and engineering in ancient Egypt, Rome, China, Europe, America 1.2 State developments from military to Civil Engineering . 1.3 State the industrial Revolution in England and its spread to Europe, Asia and Africa. 1.4 State Mo dern technology and eng ineering. 2.1 Identify the various cadres o f the engineering family . 2.2 State the ideal ratio of the different cadres of engineering personnel required for an engineering project team. 2.3 Identify the various engineering discipline. 2.4 Identify the pyramidal structure ...
Read more
How to Fix the LaTeX “Not allowed in LR mode” Error When Highlighting Revisions If you highlight changes in a LaTeX manuscript using commands such as \change{...} , \rev{...} , or \hl{...} , you may eventually run into this error: LaTeX Error: Not allowed in LR mode. This often confuses authors, especially during journal revisions. Fortunately, the cause is simple: you placed a command inside the highlight block that LaTeX does not allow in LR mode. 🔍 Why This Error Happens Highlight macros like \change{} put LaTeX into a restricted text-only mode called LR mode . Inside LR mode, LaTeX only accepts basic text . The following commands cannot appear inside a highlight block: Section commands: \section , \subsection , \subsubsection Figures and tables List environments ( itemize , enumerate ) Math environments ( equation , align ) Captions and labels ( \caption , \label ) Any \begin{...} / \end{...} environment If even one of these appears in...
Read more