|
|
|---|
| 959 |
phy.SetChannel (channel.Create ()); |
959 |
phy.SetChannel (channel.Create ()); |
| 960 |
|
960 |
|
| 961 |
Once the PHY helper is configured, we can focus on the MAC layer. Here we choose to |
961 |
Once the PHY helper is configured, we can focus on the MAC layer. Here we choose to |
| 962 |
work with non-Qos MACs so we use a NqosWifiMacHelper object to set MAC parameters. |
962 |
work with non-Qos MACs. WifiMacHelper object is used to set MAC parameters. |
| 963 |
|
963 |
|
| 964 |
:: |
964 |
:: |
| 965 |
|
965 |
|
| 966 |
WifiHelper wifi = WifiHelper::Default (); |
966 |
WifiHelper wifi; |
| 967 |
wifi.SetRemoteStationManager ("ns3::AarfWifiManager"); |
967 |
wifi.SetRemoteStationManager ("ns3::AarfWifiManager"); |
| 968 |
|
968 |
|
| 969 |
NqosWifiMacHelper mac = NqosWifiMacHelper::Default (); |
969 |
WifiMacHelper mac; |
| 970 |
|
970 |
|
| 971 |
The ``SetRemoteStationManager`` method tells the helper the type of |
971 |
The ``SetRemoteStationManager`` method tells the helper the type of |
| 972 |
rate control algorithm to use. Here, it is asking the helper to use the AARF |
972 |
rate control algorithm to use. Here, it is asking the helper to use the AARF |
|
|
|---|
| 986 |
that will be used to set the value of the "Ssid" ``Attribute`` of |
986 |
that will be used to set the value of the "Ssid" ``Attribute`` of |
| 987 |
the MAC layer implementation. The particular kind of MAC layer that |
987 |
the MAC layer implementation. The particular kind of MAC layer that |
| 988 |
will be created by the helper is specified by ``Attribute`` as |
988 |
will be created by the helper is specified by ``Attribute`` as |
| 989 |
being of the "ns3::StaWifiMac" type. The use of |
989 |
being of the "ns3::StaWifiMac" type. "QosSupported" ``Attribute`` is |
| 990 |
``NqosWifiMacHelper`` will ensure that the "QosSupported" |
990 |
set to false by default for ``WifiMacHelper`` objects. The combination |
| 991 |
``Attribute`` for created MAC objects is set false. The combination |
|
|
| 992 |
of these two configurations means that the MAC instance next created |
991 |
of these two configurations means that the MAC instance next created |
| 993 |
will be a non-QoS non-AP station (STA) in an infrastructure BSS (i.e., |
992 |
will be a non-QoS non-AP station (STA) in an infrastructure BSS (i.e., |
| 994 |
a BSS with an AP). Finally, the "ActiveProbing" ``Attribute`` is |
993 |
a BSS with an AP). Finally, the "ActiveProbing" ``Attribute`` is |
|
|
|---|
| 1006 |
|
1005 |
|
| 1007 |
We have configured Wifi for all of our STA nodes, and now we need to |
1006 |
We have configured Wifi for all of our STA nodes, and now we need to |
| 1008 |
configure the AP (access point) node. We begin this process by changing |
1007 |
configure the AP (access point) node. We begin this process by changing |
| 1009 |
the default ``Attributes`` of the ``NqosWifiMacHelper`` to reflect the |
1008 |
the default ``Attributes`` of the ``WifiMacHelper`` to reflect the |
| 1010 |
requirements of the AP. |
1009 |
requirements of the AP. |
| 1011 |
|
1010 |
|
| 1012 |
:: |
1011 |
:: |
|
|
|---|
| 1014 |
mac.SetType ("ns3::ApWifiMac", |
1013 |
mac.SetType ("ns3::ApWifiMac", |
| 1015 |
"Ssid", SsidValue (ssid)); |
1014 |
"Ssid", SsidValue (ssid)); |
| 1016 |
|
1015 |
|
| 1017 |
In this case, the ``NqosWifiMacHelper`` is going to create MAC |
1016 |
In this case, the ``WifiMacHelper`` is going to create MAC |
| 1018 |
layers of the "ns3::ApWifiMac", the latter specifying that a MAC |
1017 |
layers of the "ns3::ApWifiMac", the latter specifying that a MAC |
| 1019 |
instance configured as an AP should be created, with the helper type |
1018 |
instance configured as an AP should be created. We do not change |
| 1020 |
implying that the "QosSupported" ``Attribute`` should be set to |
1019 |
the default setting of "QosSupported" ``Attribute``, so it remains |
| 1021 |
false - disabling 802.11e/WMM-style QoS support at created APs. |
1020 |
false - disabling 802.11e/WMM-style QoS support at created APs. |
| 1022 |
|
1021 |
|
| 1023 |
The next lines create the single AP which shares the same set of PHY-level |
1022 |
The next lines create the single AP which shares the same set of PHY-level |