- Coarse structure: The GSM system uses the standard hexagonal grid N cell reuse pattern. Elements of the architecture are the mobile station (MS) subscribers, base-station subsystems (BSSs) that provide physical radio connectivity for a number of cells, and mobile switching centers (MSCs) that link BSSs together and provide handoff, call signaling and processing, and other such centralized control. MSCs are connected by either PSTNs or other such packet-switc
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