ISED Officially Publishes RSS-252 Issue 3

Release Date: December 17, 2025                                                                                                                                                                                                                                                   Document No.: Newsletter_200512001

Further Clarifying Compliance Requirements for C-V2X On-Board Units

On December 12, 2025, Innovation, Science and Economic Development Canada (ISED) officially published RSS-252, Issue 3, replacing Issue 2 (October 2023).

RSS-252 defines the certification requirements for licence-exempt Intelligent Transportation Systems (ITS) On-Board Units (OBUs) operating in the 5895–5925 MHz band using Cellular Vehicle-to-Everything (C-V2X) technology, and serves as a key regulatory reference for access to the Canadian market.

Key Highlights of Issue 3

1.    Clear Channel Allocation Supporting Multiple Bandwidths

Issue 3 introduces a new Channel Allocation section, specifying the following configurations:

10 MHz channels: 5895–5905 MHz, 5905–5915 MHz, 5915–5925 MHz

20 MHz channels: 5895–5915 MHz, 5905–5925 MHz

30 MHz channel: 5895–5925 MHz

2.    Clarification of Transmitter Power Requirements

The standard confirms that the maximum transmitter power is 2 W (33 dBm e.i.r.p.) per channel.

3.    Updated Unwanted Emission Limits

Issue 3 revises the unwanted emission limits, defining differentiated requirements based on frequency offset from the band edges. These changes help minimize interference to adjacent spectrum users and improve overall spectrum efficiency.

Transition Period

RSS-252 Issue 3 is effective upon publication, with a six-month transition period:

• During the transition period, certification under Issue 2 or Issue 3 is accepted;

•  After the transition period, only Issue 3 will be accepted;

• Equipment manufactured, imported, marketed, or used in Canada must comply with Issue 3.