In 2G (second-generation) mobile communication systems, specifically in GSM (Global System for Mobile Communications), “NCC” stands for “Network Color Code,” and “BCC” stands for “Base Station Color Code.” These codes are used for channel allocation and identification purposes within the GSM network.
NCC (Network Color Code) in 2G:
- Definition:
- The Network Color Code (NCC) is a parameter used to distinguish between different GSM operators or networks. It is a part of the Cell Global Identity (CGI), which includes the Location Area Code (LAC), Cell Identity (CI), and NCC.
- Purpose:
- The NCC helps mobile devices identify and differentiate between networks. Each GSM operator is assigned a unique NCC. When a mobile device scans for available networks, it uses the NCC to recognize and select networks based on the operator’s code.
- Range:
- The NCC is a 6-bit code, allowing for 64 possible values (2^6). This provides enough distinct codes to assign a unique identifier to each GSM operator.
BCC (Base Station Color Code) in 2G:
- Definition:
- The Base Station Color Code (BCC) is a parameter used to distinguish between adjacent cells (base stations) within the same GSM network. It is a part of the Base Station Identity Code (BSIC), which also includes the NCC.
- Purpose:
- The BCC is used to avoid interference between neighboring cells in the same GSM network. It ensures that adjacent cells do not use the same combination of NCC and BCC, reducing the likelihood of co-channel interference.
- Range:
- Similar to the NCC, the BCC is a 3-bit code, providing eight possible values (2^3). This allows for eight distinct color codes to be assigned to each network cell within the same Location Area.
- Combination with NCC:
- The combination of NCC and BCC forms the BSIC (Base Station Identity Code). The BSIC is broadcast by each base station to allow mobile devices to identify neighboring cells and make handover decisions.
- Dynamic Assignment:
- The NCC and BCC can be dynamically assigned by the network operator to different cells within the same Location Area. This dynamic assignment helps optimize channel allocation and reduce interference.
- Handover and Cell Identification:
- Mobile devices use the BSIC information during the handover process when moving between cells. The unique combination of NCC and BCC helps in cell identification and seamless handover without interference issues.
In summary, in 2G GSM networks, the NCC (Network Color Code) is used to identify different operators, while the BCC (Base Station Color Code) is used to distinguish between adjacent cells within the same network. The combination of NCC and BCC forms the BSIC (Base Station Identity Code), playing a crucial role in channel allocation, interference avoidance, and cell identification for mobile devices.