Title:
Traffic Detection Function Extensions for cdma2000 1x and HRPD
Networks
Sources: Qualcomm
Contact: George Cherian (gcherian@qualcomm.com),
Jun Wang(jwang@qualcomm.com)
Date:
Dec 05, 2011
Abstract: This contribution proposes extensions to TDF for cdma2000 1x & HRPD networks
Recommendation: Review and adopt for X.S0062 -A
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Page 1
Introduction
• TDF for cdma2000 network was proposed in X50-20110725-031r1
CT+ZTE TDF architecture for cdma2000.pptx
• What are the TDF functions as defined by 3GPP?
– The TDF is a functional entity that performs application detection and
reporting of detected application and its service data flow description to
the PCRF.
– TDF performs following functions:
• Gating:
– The gate status indicates whether the application, identified by the application
identifier, may pass (gate is open) or shall be blocked (gate is closed) in uplink
and/or in downlink direction
• Redirection:
– The Redirect indicates whether the detected application traffic should be
redirected to another controlled address. The target redirect address shall also be
included.
• Bandwidth limitation:
– The UL maximum bitrate indicates the authorized maximum bitrate for the uplink
component of the detected application traffic
Page 2
Proposal
• Extend the Traffic Detection Function for 3GPP2 to
control the following network functions
– Application based charging
– QoS Control
Page 3
Application based charging
• Differentiate charging based on different application
types for a connection
– Operator may apply different charging rules for different
type of traffic with the same application server.
– For example,
• Applications such as Facebook offers different services from
the same server: chat, personal-status-updates, video-call,
audio-call etc.
• Skype offers text chat, video-call, audio call etc
– Current mechanisms of charging based on 5-tuple packet
filter will not work due to:
• Both source & destination IP addresses are the same
• All services uses http port
Page 4
Application based charging - details
• Extend current 5-tuple to 6-tuple as follows:
–
–
–
–
–
–
Source IP addr
Destination IP addr
Source port
Destination port
Protocol
Application Identifier (added in this proposal)
• Enhance the charging record to use 6-tuple packet filter
– 6-tuple is used to identify the number of packets, QoS etc.
• Accounting entity(PDSN/HA/LMA) hosts TDF
– Mapping of Application type to the Application identifier may either
be pre-configured or be sent to accounting entity (PDSN/HA/LMA)
– When http based application are used, http header/MIME type
may be used to derive application identifier.
Page 5
QoS Control
• BBERF hosts TDF/DPI function
• PCRF installs rules to BBERF using the 6-tuple packet filter
– 6-tuple Packet Filter was discussed earlier
– Option-1: Static-Rules:
• The rules are installed statically at the time of IP connection setup
• The static rules may be set by AAA or by PCRF
– Option-2: The rules are installed dynamically
• TDF signals PCRF when it detects an application whose rules are
not installed
• PCRF obtains the rules from Application Function and passes to
BBERF
– Application Function identifies the application based on 6-tuple
• Step-2: BBERF sets up different service connections with RAN (A10
connections for (e)HRPD) with different priority
– RAN follows the priority set by the BBERF for scheduling
packets for different service connections
Page 6
QoS Control: RL control
• BBERF passes the 6-tuple packet filter to UE using
RSVP
– BBERF uses 6-tuple to identify the rule
– ReservationLabel (Flow identifier) is based on 6-tuple
• Application to Application-ID mapping may be configured
at the MS/AT either through pre-configuration or through
configuration-downloading mechanisms
Page 7