CASE STUDYRural Wireless Coverage Coastline Highway and Interior Canyons Background Long stretches of open highway would seem like pretty simple areas in which to provide wireless covera
Trang 1CASE STUDY
Rural Wireless Coverage
Coastline Highway and Interior Canyons
Background
Long stretches of open highway would seem like pretty simple areas
in which to provide wireless coverage However, when the highway is located along a scenic coastline within a rural canyon, providing wireless service becomes more challenging In addition to providing adequate capacity, the location of new cell sites is restricted in consideration for the area's natural scenery
The Problem
Two service providers were challenged with providing wireless service in the rural canyons along the California coastline One provider utilized analog modulation (AMPS) and digital modulation (CDMA) to provide
800 MHz mobile phone service, and the other provider utilized analog modulation (AMPS) and digital modulation (TDMA) for its 800 MHz service Subscribers of both services experienced poor coverage along the highway and intermittent signal loss while commuting through the canyons In addition, nearby business and residential subscribers also experienced poor service because the highway traffic utilized most of the capacity from their areas Placement of additional cell sites was severely restricted due to visual concerns and zoning regulations
Trang 2The ADC Solution
ADC worked with both providers to craft a long-range coverage solution that accommodated the AMPS, CDMA, and TDMA technologies, was visually consistent, and improved service without requiring many new cell sites Two base transceiver station (BTS) sites were added along the Pacific Coast Highway and one site was installed at each end of the canyons that were to be covered ADC host units were centralized at the BTS site, creating a base station hotel, to reduce the amount of cabinets required Each host unit digitized the RF signals and transported them over fiber optic cable to a remote unit, which reconverted the signals back into RF to provide coverage into the canyon and highway areas Because the remote units are small cabinets that were unobtrusively mounted on existing poles, the visual impact of the complete solution was minimal
The digital platform of ADC’s long-range coverage solution was particularly attractive because it easily met the needs of both service providers Digital optical RF transport can accommodate both the
CDMA and TDMA technologies that were being used by the two different service providers Identical equipment was used for each provider's network, yet the systems were easily configured individually to meet each provider's requirements One provider required dedicated TDMA channels for each site, while the other simulcast CDMA signals A zone selector was utilized with the TDMA system, allowing RF channels to be switched between different host units In that way, a mobile signal could utilize the same channel throughout the entire call
Benefits Realized by the Customer
The digital long-range coverage solution was so effective that it enabled coverage along a 12-mile stretch of winding road from a single host location Additional capacity and improved coverage was achieved throughout the highway and canyon areas As a result of the enhanced highway coverage, the two service providers' subscribers within the business and residential areas along the highway also experienced better quality of service and were more likely to retain their service Furthermore, should either provider choose to upgrade to a dual-band system in the future, ADC's solution will allow them
to do so within the existing installation by changing out the remote units without requiring additional zoning approvals to add new cabinets
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