Question: How does matchmaking work in Call of Duty?
Answer: When players enter the multiplayer game lobby in Call of Duty to participate in public online matches, they are automatically divided into groups before being placed in a match.
The primary filter for matchmaking is DLC maps. DLC maps divide matchmaking pools into groups of players who have DLC maps and players who don’t have DLC maps, and then further divides the DLC owners based on which maps they own. The more map packs that are released, the more matchmaking pools there are.
For example, players with DLC Packs 1, 2, and 3 will only be matched with other players who also have those three DLC map packs installed. They will not get matched with players who only have some of these maps or none at all.
What other factors can affect matchmaking?
Your local Internet connection quality, which itself is subject to a number of variables, can have an effect on the matchmaking process. Some factors that can decrease your quality of service include:
Time of Day
Since matchmaking works to find the game with the best connection quality, it will have a much easier time finding high-quality connections when there are more players online in your area. As a general rule, peak usage occurs during the late afternoon and evening hours in each time zone.
If you live in a remote region, it will be more difficult to find hosted games that match your profile. The best option for those in extremely remote regions is to play during local peak hours in game modes with high player counts.