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Multicast-broadcast single-frequency network

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Multicast-Broadcast Single Frequency Network (MBSFN) is a communication channel defined in the fourth-generation cellular networking standard called Long Term Evolution (LTE). It can deliver services such as mobile TV using the LTE infrastructure, and is expected to compete with dedicated mobile/handheld TV broadcast systems such as DVB-H and DVB-SH.[1][2] This enables network operators to offer mobile TV without the need for additional expensive licensed spectrum and without requiring new infrastructure and end-user devices.

Technical Details

LTE's Enhanced Multimedia Broadcast Multicast Services (E-MBMS) provides transport features for sending the same content information to all the users in a cell (broadcast) or to a given set of users (subscribers) in a cell (multicast) using a subset of the available radio resources with the remaining available to support transmissions towards a particular user (so-called unicast services). It must not be confused with IP-level broadcast or multicast, which offer no sharing of resources on the radio access level. In E-MBMS it is possible to either use a single eNode-B or multiple eNode-Bs for transmission to multiple UEs. MBSFN is the definition for the latter.[3]

MBSFN is a transmission mode which exploits LTE's OFDM radio interface to send multicast or broadcast data as a multicell transmission over a synchronized single-frequency network (SFN). The transmissions from the multiple cells are sufficiently tightly synchronized for each to arrive at the UE within the OFDM Cyclic Prefix (CP) so as to avoid Inter-Symbol Interference (ISI). In effect, this makes the MBSFN transmission appear to a UE as a transmission from a single large cell, dramatically increasing the Signal-to-Interference Ratio (SIR) due to the absence of inter-cell interference.[4]

Commercial Adoption

Commercial deployment of MBSFN features is expected to start in 2013 as an upgrade of existing LTE network.[5]

References

  1. ^ "Long Term Evolution (LTE): A Technical Overview" (PDF). Motorola Technical White Paper. p. 10. {{cite web}}: More than one of |pages= and |page= specified (help)
  2. ^ Turner, Lorraine. "3G evolution to rival DVB-H, WiMAX - Analysys". Total Telecom. Retrieved 9 February 2006.
  3. ^ Lescuyer, Pierre (2008). Evolved Packet System (EPS): The LTE and SAE Evolution of 3G UMTS. Wiley. pp. 140–143. ISBN 978-0-470-05976-0.
  4. ^ Sesia, Stefania (2009). LTE - A Pocket Dictionary of Acronyms (PDF). Wiley. p. 45. ISBN 978-0-470-69716-0. {{cite book}}: More than one of |pages= and |page= specified (help)
  5. ^ Parker, Tammy. "Making the case for LTE Broadcast and Dyle mobile TV". Retrieved 15 August 2012.
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