DPI, Policy and Charging

I am particularly impressed by the amount subscriber management that 3GPP has provided. Per packet flow treatment per subscriber is super cool. However the implementation on mobile gateways is quite complex and need a lot of cpu and memory cycles. In simple words we really need powerful hardware sitting in edge with a efficient software to correctly enforce the policy and perform corresponding charging actions.  

Just to point out, 3GPP allows service provider to treat each subscriber differently based on the subscription. A subscriber may be allowed to use certain traffic or block certain traffic, certain traffic may be treated with higher priority and bill him based on the application or location etc. The limit is endless. A very good business model is needed to make it happen though. So to allow or block certain traffic from a subscriber the gateways need to look deep into the packets, detect the flows, apply policies and report to the billing system. This is quite a lot of pressure on the gateways.

I was doing a study of various telecom plans available across the world. Interestingly some service providers were offering services like free Facebook or free sport channel at a flat monthly rate or free email etc. This makes me wonder why we even need these plans with LTE. These plans are efficient when there is sever crunch of radio resources and subscriber doesn't  have fancy handsets, but with LTE the spectrum has widened and fancy handsets are becoming cheaper and cheaper. Will these plans still hold well?

For e.g a plan like free facebook will need the mobile gateway to look at all the packets  flowing from subscriber, zero rate it and then inform the same to the billing system. This churns a lot of bandwidth in term of cpu and memory cycles on the gateway. More over the software on the gateways needs to be highly efficient.

But there is other side to it. A subscriber may be offered limited data over a period of time but as token of appreciation allow a service free. For e.g I would be very happy if “Google Maps” is offered free along with my monthly of say 200 meg. I mean truly free here, that is actually look at the Google Maps traffic and zero rating it. But service provider may not want to do, so he may allow another 50 meg of additional quota and call it token of appreciation.  Duh!

In a nutshell, 3GPP subscriber management is amazing and I believe the broadband forum agrees. DPI, Policy and Charging are cool features on mobile gateways from engineering stand point. There are several other issues with DPI as people really don’t want service provider to look at their data. Anyway the service is available and I will leave it to the marketing to decide :-) 

 

I would like to hear from you. Would you like certain services to be free along with your subscription or would you like service to be free for a low monthly or weekly rate or any other plans you want to see in the market?