CMMB Technology

The flux of multimedia contents and the convenience of mobile connectivity has created a mobile data phenomenon that is expected to overwhelm the cellular networks in the foreseeable future. Despite the advent of 4G/LTE, the growth rate of wireless data has far exceeded the capacity increase of the mobile cellular networks. The wireless delivery bottleneck is particularly evident for vast-area, high mobility terminals such as vehicles, drones, trains, and ships etc., for which the data delivery solutions must not only offer high data rates and low cost, but also be ubiquitous and scalable.

Led by Dr. Hui Liu, the chief architect of the CMMB terrestrial broadcasting standard, the CMMB Vision R&D team has been developing groundbreaking mobile data delivery technologies for more than a decade. The latest breakthrough, highlighted by the so-called “next generation broadcasting for satellite” (NGB-S) design, synergistically integrates state-of-the-art satellite broadcasting technologies with terrestrial cellular infrastructure to provide unprecedented performance in terms of multimedia content delivery capability, network scalability, and cost benefits.

Specifically, the aforementioned mobile content delivery bottleneck is tackled by a “converged mobile multimedia broadcast” (i.e., CMMB) architecture depicted in Figure 1. A CMMB network maximizes the strengths of both mobile satellite broadcasting and terrestrial cellular networks and overcomes their limitations. Without getting into the details of the converged architecture, it is sufficient to understand the solution as a high-performance heterogeneous satellite and terrestrial content distribution network (CDN) that delivers large volumes of multimedia contents to massive numbers of mobile users through satellite broadcasting, and at the same time provides interactive services though the cellular networks. The network is anchored by the world’s most powerful mobile broadcasting satellite, Silkwave-I.

CMMB Vision enjoys technological advantages in four areas:

  1. Converged mobile multimedia broadcasting (CMMB) networks
  2. Multi-purpose terminals for connected-vehicles
  3. Chipset and conditional access (CA)
  4. CMMB Vision patent portfolio

The CMMB Vision team has developed the world’s first truly converged satellite-terrestrial & broadcast-unicast convergent network that can provide order-of-magnitude performance benefits in terms of system capacity, cost, and coverage for the mobile multimedia markets. Specifically, the CMMB Vision solution involves a powerful L-band mobile broadcast satellite, Silkwave I, that delivers nearly 100Mbps of multimedia contents to unlimited numbers of vehicle users over vast areas. Relative to existing network solutions, the CMMB satellite-terrestrial network is not only superior in data rate, coverage, and cost-effiectiveness, but also advantageous in service flexibility and the richness of its ecosystems.

The NGB-S standard
For mobile broadcast service providers, the CMMB Vision turnkey solution includes the field-tested converged network design, a network protocol stack being standardized, and chipsets and reference designs for the entire ecosystem.

Among other innovations, the NGB-S standard features a satellite broadcasting waveform design that offers unprecedented spectrum efficiency and robustness against fading in a mobile environment. A number of cutting-edge technologies such as capacity-achieving APSKs, incremental LDPC, and hierarchical broadcasting are being incorporated into the NGB-S standard.

Multi-purpose terminals for connected-vehicles
Unlike a traditional DARS terminal which offers only digital audio services to vehicles, the CMMB Vision vehicle terminals are far more advanced and sophisticated, thanks to their seamlessly integrated satellite broadcasting and terrestrial cellular networks. Effectively, the multi-purpose CMMB terminal serves as a mobile media server by aggregating information such as live audio and video programs, pushed data multimedia contents from OTT providers, precision navigation signals, telemetry data, and emergency services, and then delivers them on demand to multiple devices within the vehicle.

1. Chipset and conditional access systems
One of the unique strengths of the CMMB Vision technical team is its deep knowledge and hands-on experience in broadcast ecosystem development. As a matter of fact, the CMMB Vision founding team has been the world’s leading developer of multi-standard broadcasting chipsets and the advanced conditional access (CA) system – two of the most critical pieces in the broadcast ecosystem.

2. CMMB Vision’s patent portfolio
As one of the pioneers in mobile content delivery, CMMB Vision has built up a patent portfolio that covers the key inventions in the NGB-S network to be deployed. The centerpieces of our portfolio are the network-level collaborative content delivery schemes and the link-level transmission technologies that significantly enhance the network capacity and reliability.