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Multimedia Broadcast / Multicast Service from GERAN Physical Layer Point of View

Multimedia Broadcast / Multicast Service from GERAN Physical Layer Point of View. Henri Virta Supervisor: Prof. Sven-Gustav Häggman Instructor: M.Sc. Toni Majuri. Thesis Work Presentation 17.01.2006. Contents. Background Objectives & Methodology Introduction to MBMS

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Multimedia Broadcast / Multicast Service from GERAN Physical Layer Point of View

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  1. Multimedia Broadcast / Multicast Service from GERAN Physical Layer Point of View Henri Virta Supervisor: Prof. Sven-Gustav Häggman Instructor: M.Sc. Toni Majuri Thesis Work Presentation 17.01.2006

  2. Contents • Background • Objectives & Methodology • Introduction to MBMS • Competing technologies • MBMS from PH Reselection point of view • Summary and conclusions

  3. Background information • Multimedia Broadcast Multicast Service (MBMS) is a new feature specified in 3GPP Release-6 • Method of delivering the same multimedia contents to several recipients in the service area • Main idea behind the MBMS development is to provide multimedia contents simultaneously to several users, while preserving the network and radio resources

  4. Objectives & Methodology • Objectives • Introduce the MBMS service • Compare the MBMS service to other available solutions • Analyze the MBMS service from GERAN/Physical Layer and specifically from PH reselection point of view • Methodology • Literary study based on 3GPP and ETSI specifications and change requests • MBMS related conference papers and research articles • Discussions within the Nokia organization on MBMS related issues

  5. Introduction to MBMS (1/2) • The main idea behind broadcast/multicast services is the possibility to save resources in the radio and core networks, by sharing the transmission path • All MBMS services can be provided with cellular point-to-point (P-t-P) connections, but MBMS is more efficient if the same contents is delivered to several recipients in the same area • The MBMS service is a solution for transmitting light video and audio clips, although it can also be used for real time streaming videos as well

  6. Introduction to MBMS (2/2) • MBMS bearer service offers two modes: • Broadcast Mode: • All users in the broadcast area can receive the broadcast service • Multicast Mode: • Only users who have subscribed to the specific multicast service and have joined the multicast group can receive the multicast service • The subscribers can receive services, such as streaming video in a more economical manner. • The Operator will control the MBMS service and content and can also control the QoS for the MBMS services • For the Operator, MBMS will allow more efficient delivery and flexible pricing of existing point-to-point multimedia services

  7. MBMS Procedures Multicast mode Broadcast mode

  8. MBMS architecture • MBMS architecture is designed so that the existing network elements could be re-used as efficiently as possible. • A new component: Broadcast/Multicast Service Center (BM-SC) is needed in Core Network • BM-SC serves as an entry point to content providers and is responsible for enabling the MBMS services to be provided to the end users via the Core and GERAN / UTRAN networks.

  9. MBMS User Services • The underlying MBMS technology is transparent to the end-user • MBMS is planned for Low-to-Medium bit rate multimedia services in areas where several users are receiving the same service • 3GPP specifies three different service types: • Streaming: includes time synchronization • File download: high reliability is required • Carousel: a combination of streaming and file download. Typical carousel service uses still images and text that are updated periodically.

  10. Other available solutions • DVB-H (Digital Video Broadcast – Handheld) • High bit rate multimedia services • Efficient wide-area delivery • No uplink access and other arrangements are needed • 3G Point-to-Point Connections • Low-to-high bit rate multimedia services • Efficient only when delivering content to a few individual recipients in a geographical area • Uplink easily accessible • CBS (Cell Broadcast Service) • Kind of a pioneer in mobile broadcast services • Low bit rate messaging (SMS service) • Uplink easily accessible

  11. Comparison to 3G P-t-P connection • MBMS advantage over traditional P-t-P connections is clear when there are several recipients of the same multimedia data • Resources can be spared in the Core Network as well as in the Radio Interface • The advantage of the MBMS bearer service is greatest if several users are receiving the same service at the same time

  12. Comparison to DVB-H • DVB-H provides digital television to mobile handsets • DVB-H is a solution to provide DVB-T(errestrial) programs to mobile users. The programs are sent to the mobiles in bursts by using IP data casting. • Time slicing technique is used to achieve better battery saving percentage • MPE-FEC error correction mechanism for additional robustness and mobility • More efficient for delivering high bit rate multimedia services to wide areas, however uplink access not available • MBMS has a possibility to limit transmissions only to areas populated by recipients • DVB-H pilot programs already in use

  13. Sharing (one-to-some) Service Coverage area DVB-H Multicast 3G P-t-P Boundary Area Publishing (one-to-many) 3G MBMS User density MBMS Service Positioning • Bearers competing with MBMS: • 3G Point-to-Point bearers • DVB-H multicasting • MBMS vs. 3G Point-to-Point competition in sharing-type services • MBMS vs. DVB-H competition in publishing-type services • What is the overall feasibility of the MBMS service? • What are the boundaries between competing bearers?

  14. MBMS from Reselection point of view (1/2) • MBMS NEIGHBOURING CELL INFORMATION • During MBMS the network may send MNCI messages, containing information about the neighbouring cells that are providing the same MBMS session. • Delayed Reselection During MBMS • If the mobile has not received the correct MNCI, the reselection is delayed for 1 second or until the correct MNCI is received • Neighbour cell measurements • If feedback is in use the mobile needs to report 6 strongest neighbour cells to the network in MBMS Ack/Nack message

  15. MBMS from Reselection point of view (2/2) • Reselection without the neighbour cell information • The MS must first camp to the new cells control channels • The MBMS service can be requested again from the new cell • Fast reception resumption • The MS moves directly to the new cells traffic channel (PDTCH) and continues to receive the MBMS session there. • While receiving the MBMS session, the camping procedure is completed in the new cell by receiving the required (P)SI messages. • SI2n • A new system information message introduced in 3GPP Rel-6 • Contains the necessary reselection parameters for the neighbour cells • MBMS data transfer does not need to be interrupted for neighbour cell (P)SI reception

  16. MBMS delayed reselection scheme • A simplified flow chart of the delayed reselection scheme

  17. Summary and Conclusions • MBMS is a new bearer service that provides an efficient way of transmitting multimedia information to several users simultaneously • MBMS is most efficient when several users are receiving the same service at the same time in a localized area • MBMS will be competing with 3G P-t-P and DVB-H connections • From reselection point of view, a big challenge will be the Fast reception resumption feature, since it changes the reselection and camping procedure • Future Work: • Further studies and analysis of the MBMS features, before starting any design or implementation for MBMS

  18. Thank you!

  19. Additional information • 3GPP Specifications on MBMS: • TS 22.146 Multimedia Broadcast/Multicast Service (MBMS) • TS 22.246 Multimedia Broadcast/Multicast Service (MBMS) user services • TS 23.246 MBMS Architecture and functional description • TS 26.346 MBMS Protocols and codecs • TS 43.246 Multimedia Broadcast Multicast Service (MBMS) in the GERAN • Other useful 3GPP Specification • 3GPP TS 45.008, Radio Access Network; Radio subsystem link control (Release 6) • 3GPP TS 44.060 General Packet Radio Service (GPRS); Mobile Station (MS) – Base Station System (BSS) interface, Radio Link Control/Medium Access Control (RLC/MAC) protocol (Release 6) • This material is available from the 3GPP homepage: www.3gpp.org

  20. Backup information • The MBMS service is analyzed from the Physical Layer (PH) point of view presented on the right hand side of the figure below

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