The BSC6680 implements the functions of a base station controller (BSC) and packet control function (PCF) in the CDMA2000 1X and CDMA2000 1xEV-DO systems (hereinafter referred to as 1X and EV-DO, respectively).

The BSC provides the following functions:

• Controlling and managing base transceiver stations (BTSs)
• Establishing and releasing call connections
• Providing reliable wireless connections for upper-layer services through soft and hard handoffs
• Implementing power control
• Managing radio resources

The PCF provides the following functions:

• Managing radio-packet (R-P) interface connections
• Processing PCF signaling
• Maintaining Point-to-Point Protocol (PPP) connections

The rapid development of mobile telecommunication technologies accelerates product evolution. This factor, together with increasing operational expenditure (OPEX) and intensifying competition, increases investment risks and reduces the profit margin of operating a CDMA network. Thus, operators must consider how to reduce investment risks and maximize investment returns.

The BSC6680, maintaining the concept of "continuous client-oriented innovation", adopts industry-leading hardware and software architecture, and features large capacity, high integration, excellent performance, low power consumption, and easy maintenance. In addition, the BSC6680 supports 1X, EV-DO, and IP transmission, and enables smooth network evolution into the long term evolution (LTE) network system. By providing the BSC6680, Huawei assists CDMA network operators in building excellent mobile networks with the theme of "Convergence, Broadband, Green, and Evolution."

As data services develop, the demands for high-speed data services increase as well. The BSC6680, based on all-IP switching technology, can meet the increasing demands for high-speed data services without affecting voice quality and system stability.

The BSC6680 supports EV-DO Rev. B, a wireless broadband solution evolved from EV-DO Rev. A. Currently, EV-DO Rev.B is at phase I. By binding multiple EV-DO Rev. A carriers together, EV-DO Rev. B Phase I significantly improves data transmission rates and the subscriber experience. Implemented on the CSM6800 channel board through a software upgrade, EV-DO Rev. B Phase I significantly increases network performance, maximizes return on investment (ROI), and facilitates network deployment at low costs.

• A maximum of three forward or reverse carriers can be bound together. The downlink peak rate reaches 9.3 Mbit/s, and the uplink peak rate reaches 5.4 Mbit/s.
• Seamless network handoffs can be performed between single-carrier areas and multi-carrier areas.
• EV-DO Rev. A and EV-DO Rel. 0 are supported. In addition, EV-DO Rev. B Phase I is supported only after the BSC software and the BTS software are upgraded.
• Idle handoffs and active handoffs between an EV-DO Rev. B network and an EV-DO Rev. A/EV-DO Rel. 0 network are supported.
• Dormant handoffs between an EV-DO Rev. B network and a 1X network are supported.

According to actual network deployment requirements, the BSC6680 can be used to deploy a 1X network or an EV-DO network. In addition, the BSC6680 supports CDMA digital trunking communication marked by push to talk (PTT).

1X Networking

Figure 1-1 shows the networking of the BSC6680 in a 1X network.

Networking of the BSC6680 in a 1X network

EV-DO Networking

Figure 1-2 shows the networking of the BSC6680 in an EV-DO network.

Networking of the BSC6680 in an EV-DO network

AN AAA: Access Network Authentication, Authorization, and Accounting

Digital Trunking Networking

Figure 1-3 shows the networking of the BSC6680 in a digital trunking network.

Networking of the BSC6680 in a digital trunking network

The iGateway Bill (iGWB) and the combined billing solution (CBS) can be used in the digital trunking network. Any of the preceding billing solutions can be configured according to actual networking requirements.

Cabinet

The BSC6680 adopts Huawei N68E-22 cabinet, with the design in compliance with IEC60297 and IEEE standards. Figure 1-4 shows the exterior of the N68E-22 cabinet.

Exterior of the N68E-22 cabinet

Adopting industry-leading technologies, the BSC6680 provides a large-capacity all-IP platform and a remarkably reliable design, thus assisting network operators in building green, future-oriented communications networks.

All-IP Switching Technology Facilitating Network Deployment and Supporting Network Evolution

Adopting the all-IP switching technology, the BSC6680 provides high IP transmission efficiency and various transmission modes such as E1/T1, FE/GE, and STM-1/OC-3. This facilitates network deployment in urban areas, remote islands, and deserts. In addition, the all-IP switching technology requires less NEs, thereby simplifying system design and improving system integrity, thus improving system performance and facilitating network deployment.

Based on the dual-plane, all-IP switching architecture of the BSC6680, the switching capacity of one service subrack is 120 Gbit/s, and the processing capacity of one backplane is 640 Gbit/s. Thus, the BSC6680 can meet the requirements for capacity expansion. In addition, the switching capacity of one service subrack can be expanded to 1000 Gbit/s to meet the requirements for wireless network evolution, thus protecting customer investments. The bandwidth of one service board ranges from 2 Gbit/s to 4 Gbit/s; the inter-subrack bandwidth ranges from 4 Gbit/s to 24 Gbit/s. The distinctive and uniform all-IP switching guarantees the quality of service (QoS) and supports the future-oriented evolution of mobile networks.

The BSC6680 supports the 2.1 GHz band and a dual-band networking solution. In the dual-band networking solution, the 2.1 GHz band and the 800 MHz band can be used in the same sector, thus maximizing the utilization of network resources and reducing networking costs.

Improved Voice and Data Services for a Better Subscriber Experience

The BSC6680 improves subscriber experience in voice and data services, continuously optimizing network performance and transmission networking, and thus enhancing serviceability. By using the voice quality evaluation (VQE) technology, the BSC6680 improves voice quality as perceived by subscribers. In addition, the BSC6680 provides an end-to-end (E2E) function for monitoring voice quality, thus improving the efficiency of network optimization.

The BSC6680 supports Fourth Generation Vocoder (4GV) coding and decoding algorithms when the A interface uses time division multiplexing (TDM) networking. Using multiple audio codecs, the 4GV allows network operators to balance voice quality and network capacity. The balance between voice quality and network capacity is implemented by adjusting the capacity operating point (COP) value. The higher the COP value, the larger the network capacity; the lower the COP value, the better the voice quality.

In addition, the BSC6680 adopts the EVRC2.0 algorithm when the A interface uses TDM networking. In the EVRC2.0 algorithm, the EVRC coding model is optimized, and thus voice quality is improved.

The BSC6680 can compensate for lost packets in the parameter domain. In the case of error frames, this function efficiently improves voice quality. When the reverse frame error rate (FER) is lower than 5%, the perceptual evaluation of speech quality (PESQ) is higher than 3.2. When the reverse FER is lower than 3%, the PESQ is higher than 3.5.

In addition, the BSC6680 controls echo when the A interface uses IP networking. This function efficiently improves subscriber-perceived voice quality, thus improving subscriber experience.

The BSC6680 optimizes the function of tracing internal signaling and provides the function of capturing service packets and collecting the statistics on service packets during the whole service process. Thus, signaling problems and service problems can be quickly located. This guarantees the location of data service faults.

The experience of different subscribers in EV-DO services varies. By using an E2E service experience improvement solution, the BSC6680 improves the priorities of light-traffic subscribers so that they can browse Web pages smoothly. In addition, the BSC6680 improves the stability of data downloading during intra-AN hard handoffs and inter-AN handoffs and thus guarantees the stability of service rates. The BSC6680 supports EV-DO Rev. A. After the BSC software is upgraded, the BSC6680 supports EV-DO Rev. B and thus supports a higher peak rate and higher throughput. In summary, the BSC6680 makes operators more competitive by providing customized solutions for guaranteeing the quality of data services.

A Unified Platform for Remarkable Compatibility

The Platform of Advanced Radio Controller (PARC) platform, the most advanced platform developed by Huawei, is applied to CDMA, GSM, and UMTS networks. Using established technologies, the PARC platform supports 1X, EV-DO Rel. 0, EV-DO Rev. A, and EV-DO Rev. B networks and provides services such as voice, data, PTT, voice over IP (VOIP), and videophone services.

Excellent Reliability and Improved System Stability

The BSC6680 system adopts effective solutions, such as the redundancy design, PTrunk proprietary technology, dual-panel operation and maintenance (OM) design, message-tracing tool, and clock synchronization, thus significantly improving system stability. In addition, the BSC6800 provides large capacity, high efficiency, and high reliability, making it even more competitive.

High Integrity and Low Power Consumption for Reduced Total Cost of Operation (TCO)

With high integrity, the BSC6680 improves space utilization in equipment rooms. For example, the BSC6680 adopts new concepts such as the subboard to reduce the number of required boards and thus simplify warehousing and lower maintenance costs. In addition, the BSC6680 allows boards to be inserted from both the front and the rear of the subrack, thus doubling space utilization.

In consideration of cost saving, the hardware of the BSC6680 supports multi-core interface boards such as the POUBc. The POUBc stands for the 4-port IP over channelized optical STM-1/OC-3 interface unit for Abis REV:c. The POUBc boards in active/standby mode are equivalent to eight POUBa boards, and thus using the POUBc boards helps reduce the number of required Abis interface boards. In addition, the application of ETH transmission over A2p greatly saves transmission bandwidth.

Using advanced technologies, the BSC6680 controls the power consumption of a single subscriber within 5 mW - only half that of a traditional BSC. In addition to energy saving, low power consumption means low heat emission. Thus, the BSC6680 assists in reducing the total costs of air-conditioning.

This chapter describes the technical specifications of the BSC6680, which consist of physical and electrical specifications, capacity specifications, reliability specifications, safety specifications, clock specifications, and environmental specifications.