A VBSC server controls the signaling from the remote sites and detects voice .... For a listing of ADC's global sales office locations, please refer to our website. ... portfolio as an important corporate asset and vigorously enforces its patents.
The VBSC (Virtual Base Station Controller) from ADC enables the deployment of an all IP-RAN into any legacy cellular network with a circuit switched MSC (Mobile Switching Center). Similar to traditional BSC, ADC’s VBSC can act as a concentrator where many different low capacity connections to BTSs (Base Transceiver Stations) become reduced to a smaller number of connections towards the MSC. Furthermore, in addition to providing the intelligence behind the BTS, new features and services can be seamlessly deployed with minimal disruption to the Hostexisting PLMN network by presenting standard A and Gb interfaces over TDM to the core network.
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The ADC VBSC includes the following network elements: 1. A VBSC server controls the signaling from the remote sites and detects voice activities as required to enable the local switching functions 2. Standard Media Gateway for IP-to-TDM conversion MSC
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Figure 1: ADC VBSC Overall Architecture
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Expanding the Reach of Cellular Networks Key features and benefits of VBSC Presents a standard circuit switched AIF to a central MSC with a single SS7 point code • Manages multiple ADC UltraWAVE and FlexWave BSC/BTS elements with multiple AIF links transparently to the central MSC • Performs AIF signaling multiplexing function over IP to remote BSC elements to minimize backhaul signaling
Virtual BSC (VBSC)
Local switching/backhaul optimization • Subscribers within local coverage area are detected and their location is maintained in a local VLR as they register with the central MSC • AIF CIC assigned for call voice path by central MSC is used as normal for non-local calls, and monitored for any SRF prepaid announcements from the host PLMN • Local switching is performed by detecting call end points and controlling voice RTP streams over IP between remote media gateway elements. • Calls requiring backhaul over satellite, are bandwidth optimized while maintaining high voice quality (typically G.729b codec) • Announcements played over AIF CIC for locally switched call are routed on-demand over backhaul using a specifically optimized codec Central VBSC SBSC
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Figure 2: Local Switching with VBSC Central Site
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Expanding the Reach of Cellular Networks Local handover control • An ADC R4S soft switch controls handovers within all managed BSS elements, to minimize
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handover is completed • Optionally, the R4S system could perform local handovers completely transparent to MSC to off-load all non-revenue based signaling
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Figure 3: Handover Control with VBSC
Additional Services • The ADC R4S soft switch can maintain “local only” subscribers and provide services such as drive testing and network optimization transparently to the central network
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• Private networks, specialized services, or network access control are possible
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Typical applications for ADC VBSC • Rural/remote areas coverage with satellite backhaul and local switching • Maritime cellular networks • In-building coverage and capacity solutions for off-loading macro networks • Disaster recovery and emergency coverage solutions • Tactical, rapid deployment and portable networks
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Application Note
Acronym Guide AIF
A-Interface (GSM Signal Interface Between BSC and MSC)
A VBSC server controls the signaling from the remote sites and detects voice .... For a listing of ADC's global sales office locations, please refer to our website. ... portfolio as an important corporate asset and vigorously enforces its patents.
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