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NETMANIAS TECH-BLOG Please visit www.netmanias.com to view more posts
LTE QoS (Part 3) - P2P Traffic Bandwidth
Control u...
Netmanias Tech-Blog: LTE QoS (Part 3) - P2P Traffic Bandwidth Control using the LTE QoS
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Downlink (DL) Traffic
1. When tr...
Netmanias Tech-Blog: LTE QoS (Part 3) - P2P Traffic Bandwidth Control using the LTE QoS
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based on UE-AMBR by the eNB". Si...
About NMC Consulting Group (www.netmanias.com)
NMC Consulting Group is an advanced and professional network consulting com...
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LTE QoS (Part 3) - P2P Traffic Bandwidth Control using the LTE QoS

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Click the link to download a PDF file http://www.netmanias.com/en/?m=view&id=blog&no=5934

In the last two posts (Part 1, Part 2), we learned about LTE QoS. Now, we will show you an example of controlling P2P traffic using the LTE QoS in the LTE network.

You can also find and download more materials from http://www.netmanias.com

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Transcript of "LTE QoS (Part 3) - P2P Traffic Bandwidth Control using the LTE QoS"

  1. 1. 1 NETMANIAS TECH-BLOG Please visit www.netmanias.com to view more posts LTE QoS (Part 3) - P2P Traffic Bandwidth Control using the LTE QoS October 25, 2013 | By Chris (tech@netmanias.com) | Netmanias Tech-Blog | www.netmanias.com In the last two posts (Part 1, Part 2), we learned about LTE QoS. Now, we will show you an example of controlling P2P traffic using the LTE QoS in the LTE network. Let's say there is a network operator named "NMC Telecom", and it offers a service plan with the following features:  No bandwidth limitation for Internet usage  Data rate limitation (512 Kbps for download, and 128 Kbps for upload) for P2P traffic such as BitTorrent To provide such features, NMC Telecom has an LTE QoS architecture built as follows. Below, you can see a UE, an eNB, and an SAE-GW, a combination of S-GW and P-GW. Before we begin... Deep Packet Inspection (DPI) function is required in order to detect P2P traffic from an LTE system (SAE-GW). This DPI function allows the SAE-GW to look down as deep as the payload (L7), where applications (e.g. web, voice, video, P2P, etc.) are located, in a packet. Just so you know, standalone equipment featuring only the DPI function is already available in the market from Cisco SCE, Sandvine PTS, etc. Default Bearer (Bearer ID=5) APN-AMBR (UL) Policer=Unlimited SAE-GW DPI SDF1 P2P traffic (SDF=1) SDF1 MBR (DL) Policer=512Kb DPI Rule P2P Traffic SDF Bearer ID SDF 1 Bearer 5 SDF2 SDF2 MBR (DL) Policer=Unlimited Non- GBR Bearer SDF=2 APN-AMBR (DL) Policer=Unlimited Non- GBR Bearer UE-AMBR (DL) Scheduler=Unlimited Application Non- GBR Bearer UE-AMBR (UL) Scheduler=Unlimited Non- GBR Bearer Non- GBR Bearer APN-AMBR (UL) Policer=Unlimited DPI P2P traffic (SDF=1) SDF1 SDF1 MBR (UL) Policer=128Kb SDF2 Not matched Not matched SDF=2 SDF2 MBR (UL) Policer=Unlimited DPI Rule P2P Traffic SDF Bearer ID SDF 1 Bearer 5 Filter Rule (UE IP, *, *, *, *) SDF Bearer ID SDF 2 Bearer 5PF1 PF1 PF1 Filter Rule (*, UE IP, *, *, *) SDF Bearer ID SDF 2 Bearer 5PF1 eNBUE PDN (Internet) PF1 Filter Rule (UE IP, *, *, *, *) Bearer ID Bearer 5PF1 Less than 512Kb Unlimited Unlimited Less than 128Kb Unlimited Default Bearer (Bearer ID=5) 1 2 3 4 5 6 7 1 2 3 4 5 6 7
  2. 2. Netmanias Tech-Blog: LTE QoS (Part 3) - P2P Traffic Bandwidth Control using the LTE QoS 2 Downlink (DL) Traffic 1. When traffic from the Internet (PDN) arrives at an SAE-GW, DPI in the SAE-GW checks whether the traffic is P2P traffic or not. 2. P2P traffic is mapped to Service Data Flow (SDF) = 1 and EPS Bearer ID = 5 (The SAE-GW receives information about where (to which SDF and EPS bearer) to map the P2P traffic from PCRF when a user attaches to the LTE network). 3. Since MBR (Maximum Bit Rate) for SDF = 1 is defined as 512 Kbps, the SAE-GW performs rate policing for all the P2P traffic by applying MBR of 512 Kbps (any P2P traffic exceeding 512 Kbps is discarded). 4. Traffic found by the DPI to be not P2P is classified by a SDF filter (5-tuple based packet classifier). Here, the filter is set as (Source IP, Destination IP, Protocol ID, Source Port, Destination Port) = (*, UE IP, *, *, *), where * means any value (i.e. wildcard). So, all the traffic heading to its own destination, a particular IP address of the UE, is matched by this rule, consequently mapping all the non-P2P traffic to SDF = 2, EPS Bearer ID = 5 (The SAE-GW also receives information about this SDF filter from the PCRF when a user attaches to the LTE network.). 5. Since MBR (Maximum Bit Rate) for SDF = 2 is defined as "Unlimited", no bandwidth control limitation is applied to all the non-P2P Internet traffic. 6. Because of "APN-AMBR = Unlimited" (APN-AMBR: a QoS parameter that controls the bandwidth of the traffic sent from the same APN (i.e. Internet in this example) and received at non-GBR EPS bearers), there is no bandwidth limitation for SDF = 1 and SDF = 2. These SDFs are mapped to EPS Bearer ID = 5, and delivered to the eNB through the GTP tunnels. Through the steps 1 to 6 explained so far, the bandwidth for P2P traffic is limited to 512 Kbps, whereas the bandwidth of other Internet traffic is not limited before the traffic was delivered to the eNB. 7. For the traffic delivered through EPS Bearer ID = 5 to the eNB, based on the eNB's parameter set as "UE-AMBR = Unlimited" (UE-AMBR: a QoS parameter that controls the bandwidth of all the traffic heading to the UE and received at non-GBR EPS bearers), the bandwidth of the traffic is not limited. The eNB tries to deliver the traffic to the UE to the fullest extent allowed by the available resources over the radio link. Uplink (UL) Traffic 1. When there is traffic from an application in a UE, the UE maps the traffic to EPS Bearer ID = 5 using a TFT filter (The UE cannot distinguish SDFs and only knows to which EPS bearer to send which application. SDFs can be distinguished by SAE-GW (P-GW) only). The UE receives information about the TFT filter from the LTE network when it attaches to the network. 2. For all the traffic heading to an APN (Internet) in all non-GBR EPS bearers (i.e. the one default non- GBR EPS bearer herein), the bandwidth is controlled by APN-AMBR in the UE. However, since the parameter is set as "APN-AMBR = Unlimited", the UE sends all the traffic, P2P or not, using the maximum available bandwidth. 3. The UE traffic is delivered to the eNB, which control the uplink bandwidth of the traffic in all the non- GBR EPS bearers sent by the UE based on UE-AMBR. To be accurate, it is wrong to say the UE sends the traffic using the maximum bandwidth and the eNB controls UE-AMBR. Since the eNB gives the UE transmission opportunities based on UE-AMBR (by allocating Resource Block (RB) over the radio link), you should say "The bandwidth of the traffic to be sent over the radio link by the UE is controlled
  3. 3. Netmanias Tech-Blog: LTE QoS (Part 3) - P2P Traffic Bandwidth Control using the LTE QoS 3 based on UE-AMBR by the eNB". Since the parameter is set as "UE-AMBR = Unlimited", the UE will try to deliver the traffic to the eNB to the fullest extent allowed without any bandwidth limitation. 4. When the SAE-GW receives traffic from the eNB through EPS Bearer ID = 5, it controls the bandwidth of all the traffic in non-GBR EPS bearers that is heading to the same APN (Internet in this example) by using APN-AMBR. Since the parameter is set as "APN-AMBR = Unlimited", there is no limitation on bandwidth here. 5. Then, the DPI in the SAE-GW distinguishes P2P traffic and non-P2P traffic (So, it's always the SAE-GW that distinguishes P2P traffic, whether in uplink or downlink.). 6. P2P traffic is defined as SDF = 1, and thus its bandwidth is limited to 128 Kbps as set by MBR = 128 Kbps. 7. All other Internet traffic are defined as SDF = 2, and they are delivered to the Internet without bandwidth limitation as set by "MBR = Unlimited". This way, we can divide the traffic that travels through one EPS bearer into P2P and other Internet traffic, and then control the uplink/downlink bandwidth of P2P traffic only.
  4. 4. About NMC Consulting Group (www.netmanias.com) NMC Consulting Group is an advanced and professional network consulting company, specializing in IP network areas (e.g., FTTH, Metro Ethernet and IP/MPLS), service areas (e.g., IPTV, IMS and CDN), and wireless network areas (e.g., Mobile WiMAX, LTE and Wi-Fi) since 2002. Copyright © 2002-2013 NMC Consulting Group. All rights reserved. 4 Carrier WiFi Data Center Migration Wireline Network LTE Mobile Network Mobile WiMAX Carrier Ethernet FTTH Data Center Policy Control/PCRF IPTV/TPS Metro Ethernet MPLS IP Routing 99 00 01 02 03 04 05 06 07 08 09 10 11 12 13 eMBMS/Mobile IPTV Services CDN/Mobile CDN Transparent Caching BSS/OSS Cable TPS Voice/Video Quality IMS LTE Backaul Netmanias Research and Consulting Scope Visit http://www.netmanias.com to view and download more technical documents. Future LTE IP/MPLS CarrierEthernet Networks Consulting POC Training Wi-Fi Infrastructure Services CDN Transparent Caching IMS Concept Design DRM eMBMS protocols Analyze trends, technologies and market Analysis Report Technical documents Blog One-Shot gallery We design the future We design the future We design the future

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