PacketTags on LTE

[Konstantinos]

Hi,

I have created a simple LTE scenario and I have installed PacketSink application on some UEs and a simple application that schedules packets with a specific packet tag attached.

I configured a callback in order to print this packet tag when a packet is received using this:

Config::ConnectWithoutContext("/NodeList/*/ApplicationList/*/$ns3::PacketSink/Rx",MakeCallback (&ReceivePacket));

The ReceivePacket is just a void method to print a text (a value in the tag).

 

Even though I see received packets in FlowMonitor, I can't see any text printing, like there is no tag.

With the same configuration (same applications) in a WiFi network, it worked. 

I'm wondering if there is something "wrong" (a bug) with LTE when copying the files across and not copying the tags.

Regards,

Konstantinos

[Konstantinos]

In case you want to test it I attach the source code.

It is based on ns-3.16 example of lena-epc.

[Mamatha Vemula]

Hello sir,
I need a help from you.
In my college I asked to do a project on ns3. Iam new to it.
Could you please suggest me any project which i can implement in 2 or 3 days?
Could you please help me..

Thank you very much in advance..

Regards,
Mamatha.

[Konstantinos]

I found a work around with the use of Packet Header (Seq_Ts_Header in Applications). But still can't unterstand what was the problem with Packet Tags.

[Nicola Baldo]

I suggest to try changing this:

  packet->AddPacketTag(tag);

into this:

  packet->AddByteTag(tag);

in MyApp::SendPacket(). The issue is that LTE RLC performs segmentation and concatenation of packets: I think a PacketTag can't survive this, but a ByteTag should.

[Konstantinos]

Dear Nicola,

Yes, that solve one part of the problem.. meaning that the byte tag is available in the packet throughout LTE network

However, I can't find an easy way to read it. For packet tags, there was PeekPacketTag but no such method is currently available for Byte Tags.

I will try to create a similar method using the PrintByteTags to see how I can access ByteTags.

[Azade Eta]

Dear Konstantinos

I have the same problem. I defined a new Tag for my self, and add it to my packet before sending by remotehost. (AddPAcketTag)

But, unfortunately, there is no tag when packet received by IPv4-list-routing in UE node.

I need to read packet tag there to decide on routing, 

Do you solve the problem?

Thank you

Azade

[Tommaso Pecorella]

This topic has been discussed previously. Many times.

T.

[Azade Eta]

Thank you

I want to add Tag to send over Lte network, based on this post, i found that using addByteTag instead of AddPacketTag may solve the problem, however there is no peek method to retrieve tag in UE

I did not find answer in other topics, could you please guide me?

I defined my Tag class and all necessary methods completely.

Thank you

Azade

[Tommaso Pecorella]

No, I will not guide you, because the ns-3 manual already covers this topic with great detail.

This forum is NOT a substitute for the manual.