Several Access Requests after a succesfully authentication

[Tom Yard]

Dear people, I have a Freeradius server that authenticate users against an
AD in order to access the WiFi network:

Once a user authenticates OK and access the WiFi network, in the debug log
of Freeradius I notice that this user has several access requests at the
same time he is using the WiFi correctly. The access request frames are as
the shown below:

rad_recv: Access-Request packet from host 192.168.10.1 port 32768, id=103,
length=432
        User-Name = "jsmith"
        Chargeable-User-Identity = ""
        Location-Capable = Civix-Location
        Calling-Station-Id = "80:ab:17:46:69:10"
        Called-Station-Id = "6c:99:89:8b:62:50:Employees"
        NAS-Port = 13
        Cisco-AVPair = "audit-session-id=ac1f0c620001129d5bd059a8"
        Acct-Session-Id = "5bd059a8/80:ad:16:46:69:10/117467"
        Cisco-AVPair = "mDNS=true"
        NAS-IP-Address = 192.168.10.1
        NAS-Identifier = "CC-803"
        Airespace-Wlan-Id = 8
        Service-Type = Framed-User
        Framed-MTU = 1300
        NAS-Port-Type = Wireless-802.11
        Tunnel-Type:0 = VLAN
        Tunnel-Medium-Type:0 = IEEE-802
        Tunnel-Private-Group-Id:0 = "803"
        EAP-Message =
0x0207006b1900170301006097b83712638612527a05475ecd25d67e6076490aee95d35c489925635aee89c40643f7792122452628ac3c6deb27afd73a619069eab529f5afcc4646fa17195991294d33614f549480f045e3a0aba117ff7c4182bdfdbd935055c2577f056d01
        State = 0x413cfeec443be7e0d7f6ff4a2526d7aa
        Message-Authenticator = 0xc54014a6929ff04d4e13b6a8be7b79ad

Why is this behaviour? Because I thougth the access requests are used only
when the user is going to authenticate and never.

Thanks a lot, regards !!!