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3 Presentation_ID © 1999, Cisco Systems, Inc. Packet/VoIP over Cellular Architecture Services IP Network Radius DHCPDNS Edge Router SIP Proxy/ Media Gateway Controller PSTN-GW SS7 GW SS 7 PSTN SS7 Local Part of End-to-End Network(s) PDSN Min. BW w/ bounded delay, always on Mobile Network CDMA Access Network Mobile Router COPS
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1Presentation_ID © 1999, Cisco Systems, Inc.
QoS for CDMA
Dana Blair
Presentation_ID
2Presentation_ID © 1999, Cisco Systems, Inc.
Wireless Access: A Single IP network
IP Network EnterpriseNetworks
Other IPNetworks
All-IPwirelessaccess
CircuitNetworksLegacy
Radio Access
Wireless becomes just another access technologyWireless becomes just another access technologyMobility mgmt & radios resource mgmt are the keyMobility mgmt & radios resource mgmt are the key
Other AccessNetworks
(DSL, Cable, …)
3Presentation_ID © 1999, Cisco Systems, Inc.
Packet/VoIP over Cellular Architecture
Services
IPNetwork
Radius DHCP DNS
Edge Router
SIP Proxy/Media Gateway
Controller PSTN-GW
SS7 GWSS7
PSTN
SS7
Local Part of End-to-EndNetwork(s)
PDSN
Min. BW w/ bounded delay, always on
MobileNetwork
CDMA Access Network
Mobile Router
COPS
4Presentation_ID © 1999, Cisco Systems, Inc.
When is QoS Applicable ?
• BW < 28k bpsToo slow. No noticeable differentation possible. All data is Best effort
• 28k bps < BW < 64k bpsQoS possible.Strongly dependent on packet overhead, access network latency
• 64k bps < BWQoS is achievable
• Precise numbers may vary with technology and implementation
5Presentation_ID © 1999, Cisco Systems, Inc.
QoS over Slow BW links ?
• BW < 1.5 Mbps• Fancy Queueing• Link Fragementation and Interleaving• Traffic shaping• Traffic policing• Traffic marking• Admission control
6Presentation_ID © 1999, Cisco Systems, Inc.
Access Link Attributes
• Minimum BW• Maximum delay• Maximum bitrate• Maximum bit error rate
7Presentation_ID © 1999, Cisco Systems, Inc.
Application Interface
• Resource Reservation Protocol• RSVP combines multiple application layer requirements into
link layer attributes for a single access link.• RSVP enables admission control and billing.• RSVP not specific to any link layer QoS.• RSVP signaling initiates link layer QoS for a given access link. • Use fancy queueing to schedule packets for transmission
according to priority• Use LFI to create upper delay bound for delay sensitive
packets.
8Presentation_ID © 1999, Cisco Systems, Inc.
Benefits of IP QoS
• Single access link between Mobile and PDSN• Simpler, more predictable access network behavior• Common addmission control/billing for all access
networks• Handoff context minimized• Supports QoS from mobile networked devices• QoS behavior does not change as PDSN migrates
closer to the BTS.
9Presentation_ID © 1999, Cisco Systems, Inc.
CDMA QoS Architecture
PDSN
Min. BW w/ bounded delay, always on
MobileNetwork
CDMA Access Network
Mobile Router
BTS
BSC PCF
IPNetwork
RadiusCOPS
TerminalEquipment
10Presentation_ID © 1999, Cisco Systems, Inc.
QoS Flow
PDSNMR BTS BSC PCFTE RADIUS COPS
RSVPRSVP
COPS
COPS
CDMA L2 (modify)CDMA L2 (modify)CDMA L2 (modify)CDMA L2 (modify)
CDMA L2 CDMA L2 CDMA L2 CDMA L2
RSVP
RSVP
CDMA L2 (create)CDMA L2 (create)CDMA L2 (create)CDMA L2 (create)
Create Best Effort (BE) access linkCDMA L2 CDMA L2 CDMA L2
Radius
Radius
Modify BE access link to
support QoS (max delay,minimum BW, max BER)
11Presentation_ID © 1999, Cisco Systems, Inc.
Questions
• ????????
