[PDF] - System Enhancements for Accessing Broadcast Services in All-IP PDF Document

SLIDE 1

System Enhancements for Accessing Broadcast Services in All-IP Networks

 Patrick Stupar Krishna Pandit and Wolfgang Granzow  Patrick Stupar, Krishna Pandit, and Wolfgang Granzow  Qualcomm CDMA Technologies GmbH

Motivation

36 4 % 54.2 %

Source: Internet Users Forecast by Countries, eTForecasts & Computer Industry Almanac,

18.0 % 23.1 % 36.4 %

 Over 4 billion cellular subscriptions

Over 3 billion of these based on 3GPP standardized technology

February 2008

 Increase of IP based services accessed by users through 3GPP device  3GPP solution: definition of all-IP network

2

P. Stupar, K. Pandit, and W. Granzow:

System Enhancements for Accessing Broadcast Services in All-IP Networks

SLIDE 2

All IP Network definition

 “All IP Network” (AIPN) paradigm

The deployment relies on the usage of Internet Protocol (IP) on all the network nodes
Every base station implements IP functionalities (acts as an IP access router)

Inter orking bet een different mobile s stems is based on IP

Interworking between different mobile systems is based on IP
Enables new technologies deployment with minimal extensions to the core network

reducing CAPEX

P bli I t t Trusted non-3GPP Access Public Internet 3GPP Enhanced Packet Core PGW 3GPP GPRS Core ePDG GERAN Access UTRAN Access E-UTRAN Access Untrusted non- 3GPP Access (E.g. WiFi)

3

P. Stupar, K. Pandit, and W. Granzow:

System Enhancements for Accessing Broadcast Services in All-IP Networks

Broadcast technology integration in an AIPN

 Challenges for integration of broadcast technology/services in an AIPN

The broadcast services rely on a central entity acting as content provider
Solutions may require synchronized data packets delivery (see e.g. evolved Multimedia

Broadcast Multicast Service - eMBMS)

 Adopted approach: interworking between broadcast system and AIPN  Adopted approach: interworking between broadcast system and AIPN

Provisioning of broadcast services to the user over different access systems
Depending e.g. on the user scenario, network load conditions, and radio conditions, the access

system can be dynamically changed

Reference architectures: 3GPP Evolved Packet Core (EPC) and eMBMS
Reference architectures: 3GPP Evolved Packet Core (EPC) and eMBMS

BM-SC

Content Provider

Trusted non-3GPP Access Public Internet 3GPP Enhanced Packet Core (EPC) MBMS-GW PGW 3GPP GPRS Core Access Packet Core (EPC) ePDG GERAN Access UTRAN Access E-UTRAN Access Untrusted non- 3GPP Access (E.g. WiFi)

4

P. Stupar, K. Pandit, and W. Granzow:

System Enhancements for Accessing Broadcast Services in All-IP Networks

(E.g. WiFi)

SLIDE 3

EMBMS reference architecture model

Provides the eNodeB

MBSFN A

Provides the eNodeB

with the multicast related information (defined by MBMS-GW)

Admission control

Allocation of radio

MBSFN Area

(Multimedia Broadcast multicast service Single Frequency Network)

Allocation of radio

resources

Membership function
Session and Transmission function
Service Announcement function
Content synchronization
IP multicast

distribution of MBMS user plane data (M1 reference point)

5

P. Stupar, K. Pandit, and W. Granzow:

System Enhancements for Accessing Broadcast Services in All-IP Networks

E-UTRAN EPC Public Internet

Interworking scenarios and problem statement

 Interworking scenarios

Resources optimization - counting

– Number of users in a MBSFN area is low Unicast channel can be sed to deli er the broadcast ser ice – Unicast channel can be used to deliver the broadcast service

Retention priority

– Network can not deliver through broadcast channel all the broadcast services – Broadcast services not delivered through broadcast channel are unicasted Broadcast services not delivered through broadcast channel are unicasted

 Problem statement

In the above scenarios the service may stop being available over the broadcast

channel

Interrupting the service would mean a bad user experience and is unacceptable for
perators
WLAN interworking is one option to enable service continuity
An architecture and protocols to enable WLAN interworking with the MBMS bearer

An architecture and protocols to enable WLAN interworking with the MBMS bearer service need to be designed

6

P. Stupar, K. Pandit, and W. Granzow:

System Enhancements for Accessing Broadcast Services in All-IP Networks

SLIDE 4

Possible architectural approaches

 Architecture 1

Re-usage of existing interfaces for EPC-WLAN interworking

 Architecture 2

D fi i i f i f b PDG/WLAN d MBMS GW

Definition of an interface between ePDG/WLAN and MBMS-GW

 For each considered architectures there are 2 possible solutions based on the IP transmission mode transmission mode

Unicast vs. multicast

7

P. Stupar, K. Pandit, and W. Granzow:

System Enhancements for Accessing Broadcast Services in All-IP Networks

Architecture 1 – Re-use non-3GPP access architecture

IP Access Router for 3GPP access
Connects the 3GPP network to public

Internet (through SGi) Anchor mobility among 3GPP and

Anchor mobility among 3GPP and

non-3GPP accesses End point of data traffic encryption tunnel

 Two possible flavors

Multicast routing in the network between PGW and ePDG/WLAN

8

P. Stupar, K. Pandit, and W. Granzow:

System Enhancements for Accessing Broadcast Services in All-IP Networks

Unicast tunneling between PGW and UE

SLIDE 5

Architecture 1 – Considerations

 IP Multicast based approach

The service packets are transmitted on IP multicast through the SGi interface
The PDN-GW forward the IP multicast packets to the UE

Impact on the e isting architect re

Impact on the existing architecture

– Multicast routing protocol capability is required in

PDN-GW
Network implementing the SGi interface

Network implementing the SGi interface

Network between the ePDG and the PDN-GW

– Multicast routing protocols usage must not taken as granted

Several networks do not implement it

 IP Unicast based approach

The BM-SC transmits the packets in IP unicast using as IP destination the UE address
Impact on the existing architecture

Th PDN GW d t b i f d h th th k t d t b t – The PDN-GW needs to be informed whether the packets need to be sent over WLAN or EPC

9

P. Stupar, K. Pandit, and W. Granzow:

System Enhancements for Accessing Broadcast Services in All-IP Networks

Architecture 2 – New interface WLAN and MBMS-GW

 ePDG interface can be based on GTP

M1 interface between MBMS GW and eNodeB is GTP based

10

P. Stupar, K. Pandit, and W. Granzow:

System Enhancements for Accessing Broadcast Services in All-IP Networks

M1 interface between MBMS-GW and eNodeB is GTP based

SLIDE 6

Architecture 2 – Considerations

 IP Multicast based approach

The service packets are transmitted on IP multicast through the M1 interface as when

sent to the eNodeB

Impact on the existing architecture
Impact on the existing architecture

– M1 interface between MBMS-GW and ePDG – Control plane interface between ePDG and MME – If the usage of WLAN needs to be selective (e.g. streaming service requires E- g ( g g UTRAN only) BM-SC needs to be “technology” aware

 IP Unicast based approach

IP unicast based M1 for E-UTRAN is not specified

N i t t i t b i t d b th MBMS GW i f E UTRAN – No point-to-point bearer is created by the MBMS-GW in case of E-UTRAN

If M1 interface can be unicast for E-UTRAN, impact on the existing architecture are:

– Control plane interface between ePDG and MME – If the usage of WLAN needs to be selective (e g streaming service requires E- If the usage of WLAN needs to be selective (e.g. streaming service requires E UTRAN only) BM-SC needs to be WLAN aware

11

P. Stupar, K. Pandit, and W. Granzow:

System Enhancements for Accessing Broadcast Services in All-IP Networks

Comparison of 2 architectures

PROS CONS Re-use non-3GPP access multicast Requires no new interfaces Require multicast routing protocol deployment access - multicast interfaces protocol deployment Re-use non-3GPP access unicast

Requires no new

interfaces

Minimal impact to existing

Non-optimal delivery of traffic access - unicast

Minimal impact to existing

architecture p y Interface WLAN and Optimized integration Extensions to existing architecture (control plane MBMS-GW - multicast (traffic not routed through the internet) architecture (control plane MME-ePDG and user plane ePDG-MBMS-GW) Same as m lticast based Same as m lticast based Interface WLAN and MBMS-GW - unicast Same as multicast based solution (M2 interface can implement unicast or multicast) Same as multicast based solution (M2 interface can implement unicast or multicast)

12

P. Stupar, K. Pandit, and W. Granzow:

System Enhancements for Accessing Broadcast Services in All-IP Networks

) )

SLIDE 7

Conclusions

 Study and analysis of interworking between an AIPN and a broadcast service system

Reference: 3GPP eMBMS and EPC architecture

 Identification of scenarios for inter orking bet een AIPN and a broadcast ser ice  Identification of scenarios for interworking between AIPN and a broadcast service system  Proposal of 2 possible approaches suitable for the identified scenarios

Architecture 1 – re-usage of existing interfaces

Architecture 1 re usage of existing interfaces

Architecture 2 – definition of a new interface

 Comparison of solutions

Architecture 1

– Limited impact on existing architecture – Requires transmission of broadcast service through the public Internet (i.e. not controlled by the mobile network operator) A hit t 2

Architecture 2