The Inbound and Outbound Rate Limit is enforced on a per-station basis whether the rate limit is assigned to a rule, role or WLAN. Each station has its own set of counters that are used to monitor its wireless network utilization. Traffic from other stations never count against a station's rate limits.
If two or more rules in the same role assign the same named rate profile to a station's packets, then those rules "share" the rate profile. In Rate Limiter Example, a role's rules assign both HTTP and FTP traffic to the same rate limiter. The sum of the amounts of HTTP and FTP traffic determine whether the rate limit is being exceeded. Each station gets its own set of rate limiters. So the HTTP and FTP traffic of other stations never gets counted against a station's own rate profile limits.