The cornerstone of carrier-grade products – ATCA platform series solutions

Abstract: This paper expounds the demand for the hardware platform for the development of carrier-class equipment, and on this basis, introduces the solution of Datang Mobile’s RASTAP platform for related telecom applications, which can meet the requirements of telecom RAS, general purpose, IP-based, and serialized scale support. need.

For many years, the telecom platform has been built on the closed and proprietary platform of each manufacturer, which is almost contrary to the development trend and thinking of standardization and modularization in various industries. maintenance brings great difficulty. In fact, only truly open industry standards can bring competition. The release of the ATCA specification has injected new ideas and vitality into the communication industry. Its goal is to provide standardized support for NEBS and a platform architecture with 99.999% availability for carrier-class applications. It has also become a very good opportunity for the communication industry platform to change.

In terms of design, ATCA has considered serving communication equipment from the basic design. epuipment Manufactory, telecommunications equipment manufacturers), so it is very suitable for the telecommunications industry. Using the ATCA platform to develop products can save the development cycle and improve the cost-effectiveness, which will ultimately make the TEM more convenient and fast to develop products and get rewards. For operators, maintenance costs can be reduced and costs can be reduced.

With the continuous development of communication networks, mobile data services have been pushed to a new level, and considering the explosive growth of data services in the future, from the perspective of investment protection, newly launched products need to provide several times the data throughput of current mainstream products. This puts forward higher requirements for the underlying computing platform—more powerful computing performance, more powerful data transmission capability, cooling performance matched with powerful computing performance, and more powerful system management capabilities .

Based on the forward-looking analysis of the development of the telecommunications network, Datang Mobile is the first in the industry to launch the RASTAP carrier-class general hardware platform based on the advanced ATCA architecture. RASTAP products comply with PICMG3.0 core specification and PICMG3.1 Ethernet interconnection specification, and support smooth evolution of series platforms from 1G, 10G to 40G per channel. , the RAS feature is the core of telecom and IT equipment, and the support of this feature can ensure the reliability, availability and serviceability of business applications.

RASTAP products use standard 19″ cabinets, which are composed of high-performance switch boards, processor boards, and interface boards, which can meet the application of high-throughput and high-reliability telecom industry products. The hardware platform provides switched connections, each The point-to-point connection can reach a maximum bandwidth of 40Gbps, and the switching capacity of a single frame supports serial configurations of 24Gbps, 240Gbps, and 640Gbps; supports IMA E1, PPP E1, fractional E1, STM-1, channelized STM-1, STM-4 , POS, CPOS, FE, GE, 10GE and other rich interface types; the service plane adopts different boards such as multi-core processors, network processors, DSPs, etc., for different types of applications, providing powerful processing capabilities, multi-core processor boards Provides a hardware encryption engine, and the single board supports 10Gbps processing capacity. The control plane adopts X86 multi-core processing, which supports powerful signaling and protocol processing capabilities; the heat dissipation performance has been greatly improved, which provides conditions for the application of high-performance single boards .

The RASTAP platform can provide a wealth of IP-based general solutions, with the following features and advantages:

The platform has been widely used in TD-SCDMA RNC equipment running stably in China Mobile. The serialized platform can quickly build products and shorten the product development cycle;

Has rich experience in the development of large-scale carrier-class equipment to help customers build complete solutions;

SASAC is a large-scale telecom equipment provider, providing credible after-sales service.

Based on Datang Mobile’s RASTAP general IP-based hardware platform, it is very convenient to build cost-effective multi-network element products. It can support TD-SCDMA RNC, LTE EPC, DPI applications, IMS, WLAN AC, etc. only by loading different software. The establishment of network equipment can also support the smooth upgrade capability of customers, integrate into the network more conveniently and quickly, and protect user investment; thus, it can greatly reduce operating costs and save maintenance costs.

1. TD-SCDMA RNC product application solutions

The hardware structure of the TD-SCDMA platform is as follows:

The cornerstone of carrier-grade products – ATCA platform series solutions

Figure 1 TD-SCDMA RNC system composition

As shown in Figure 1, TD-SCDMA follows the principles of control and business separation, which can meet the needs of customers for rapid business development. The platform’s control plane, user plane, and system management IPMI all use double-star switching interconnection; key boards such as clock, switching, global master control, and signaling processing support 1+1 hot backup working mode; the switching unit provides 24Gbps non-blocking switching , complete the data interaction between the units of the system; each unit of the system interacts through Gigabit Ethernet, and the IP exchange method makes data transmission very efficient and flexible, which can well meet the needs of future high-speed data business growth; business The resource pool solution is adopted for processing, which can ensure the balance of processing load; the interface board processing has a redundant backup mechanism. When an interface fails, the system can automatically perform protection switching without interrupting services. Equipment monitoring can periodically detect the temperature of key components on the board, board voltage, fans and other detection points, and can automatically control heat dissipation according to changes in the operating environment of the equipment, ensuring the normal operation of the equipment.

The network synchronization system of the RASTAP platform can be flexibly configured according to the different requirements of network elements to meet the requirements of level 2 or level 3 clock accuracy. In terms of power supply, the -48V power supply standard in the telecom industry is adopted. It supports dual-channel power supply access from the equipment power distribution inlet, sub-box, and single board at three levels. The platform provides good heat dissipation performance and overheating protection, and each slot supports a maximum of 200W. (It can be upgraded to a 300W platform according to high-performance application scenarios) heat dissipation capacity, three fan groups are used in the box, and the failure of a single fan does not affect the work of the whole frame; the design of manageable fans is adopted, and the wind speed can be automatically adjusted according to the actual operating conditions of the system; The perfect load control algorithm and reliable CPU occupancy detection algorithm provided by the product can ensure the high reliability of the device.

RASTAP products are very simple to maintain. The components of the hardware platform are designed with the FRU idea, which can greatly reduce the MTTR time; the Flash/FPGA/CPLD/IPMC firmware of each single board has the online download function, which is convenient for remote and centralized maintenance; there are few types of cables, a total of 3 types of cables , simplifies engineering construction and easy maintenance; the equipment supports upper and lower wiring, which can flexibly meet the convenience of equipment room and engineering installation and maintenance; the box is designed with front and rear inserts, and the rear outlet is simple and beautiful, and easy to maintain.

2. TD-LTE EPC product application solutions

The cornerstone of carrier-grade products – ATCA platform series solutions

Figure 2 TD-LTE EPC system composition

As shown in Figure 2, TD-LTE products are composed of MME, SGW, PGW, PCRF, CG, NTP, DNS, HSS, OMC and related peripheral connecting devices (FW, CE, Switch, BG etc). Among them, core network elements such as MME, SGW, PGW, PCRF can be flexibly and quickly constructed based on RASTAP platform products, while protecting our core values ​​and key technologies.

MME is a high-performance product built on the open SAF middleware. It utilizes the experience accumulated by Datang Mobile in wireless access network equipment, and has the characteristics of higher integration, higher performance and flexibility.

SGW/PGW is a high-performance, high-integration intelligent signaling service gateway. This product is specially designed for mobile multimedia core networks, providing stable IP access points for all sessions, providing hierarchical services according to the QoS levels of users and sessions, and supporting users’ mobile access within or between wireless access networks . Support SGW/PGW separate and co-located.

PCRF is the key network element connecting the EPC and the application layer. It is a necessary device for QoS control and policy charging to improve service experience and complete refined operations.

CG is a cross-platform, multi-access high-performance billing gateway product produced by Datang Mobile based on the RASTAP platform and built on open middleware. It can meet the needs of different customers and support various types of products. access.

The cornerstone of carrier-grade products – ATCA platform series solutions

Figure 3 SGW/PGW network element configuration indicators based on RASTAP products

Based on the realization of network elements of Datang Mobile’s core, and integrating peripheral interconnected devices through OEM, it can provide the overall solution of EPC. The LTE EPC has passed the construction and testing of the Shanghai World Expo Network, and now China Mobile is constructing and verifying the Nanjing trial network to prepare for the subsequent large-scale LTE network construction.

The cornerstone of carrier-grade products – ATCA platform series solutions

Figure 4 Datang Mobile Shanghai World Expo EPC test network

3. DPI application solutions

In the 3G core network and the LTE core network SGW and PGW network element equipment, there is a DPI function to analyze and detect the data flow. Since these network elements are billed based on content, it is necessary to conduct in-depth analysis of the data content, such as Layer 3 IP addresses and protocol types, Layer 4 ports, Layer 7 URLs and their protocol types, etc., and generate bills, and telecom operators have real-time, high-speed, and large-capacity service requirements, and require There is redundant processing and backup, which puts forward higher requirements for the data packet and message processing technology and platform.

Ordinary packet inspection only analyzes the content of IP packets below layer 4, and identifies the application type by port number, and ordinary packet inspection cannot identify the application layer. However, DPI (Deep Packet Inspection, deep packet inspection) technology can realize SGW/PGW charging, which can identify and distinguish network traffic, carry out traffic control, content charging, junk content filtering and traffic management, and provide differentiated operation guarantee.

DPI detection is actually a computationally intensive application, which requires scanning the entire data packet, and the computational overhead is very large. Traditional network devices mostly use software solutions to implement this function, and they are processed on a general-purpose CPU. In the case of monopolizing one CPU core, they can only achieve Mbit/s-level processing capability, which is not suitable for carrier-level deployment. At the same time, the DPI deployment of LTE services emphasizes the refined operation and integration of multimedia data services. At the same time, the DPI solution must consider the current needs and expansion of 2.5G and 3G data services. China Mobile has a clear strategic demand for network integration development.

The RASTAP V220 version launched by Datang Mobile provides a DPI processing board, which can perform hardware linear DPI processing through dedicated hardware design.

The cornerstone of carrier-grade products – ATCA platform series solutions

Figure 5 RASTAP DPI processing monolithic

The hardware DPI processing capability of the RASTAP DPI processing blade: It can provide more than 100,000 content charging rule configurations, and a single blade can process 2Gbit/s line speed; it supports rich regular expression rule structures, and provides “*”, “? ” and other character configurations; parsing protocols support WAP1.x/2.0, HTTP, MMS, KJAVA, BREW, FTP, SMTP, POP3, IMAP, RTSP and instant messaging, etc.; provide user/session/service-based flow control, speed limit, Block and redirect (routing).

4. Datang Mobile IMS application solution

Datang Mobile can provide an overall solution for IMS services based on RASTAP platform products, as shown in the following figure:

The cornerstone of carrier-grade products – ATCA platform series solutions

Figure 6 Datang Mobile IMS application solution

The main features of IMS services are as follows:

Support multimedia communication services such as VOIP and video telephony between fixed network IP terminals;

Support multimedia communication services such as VOIP and video telephony between fixed network IP terminals and mobile terminals;

For mobile access users, non-real-time services such as IM and download are provided;

For group customers, a unified IP Centrex service is provided; PoC services based on scheduling can be carried out as appropriate (limited by TD terminals).

5. Datang Mobile WLAN AC application solution

With the increasing popularity of the Internet and the widespread use of mobile terminals (including notebook computers, WiFi mobile phones, and PDAs), people’s demand for wireless IP access has grown rapidly, and wireless local area networks (WLAN) have become more and more widely used. Relying on the advantages of flexible application, easy installation and short construction period of wireless access technology, WLAN, as a high-speed wireless access method, is building a flexible, efficient and perfect broadband network together with wired network.

Figure 7 Datang Mobile WLAN application solution

The WLAN fat and thin transformable product solutions launched by Datang Mobile include indoor and outdoor APs, and intelligent wireless switches (also known as: access controller: AC). The AC will be introduced below.

The wireless switch is a carrier-grade wireless control device, which transfers functions such as wireless network and security processing to the wireless switch, and centrally manages all APs and wireless users. It has functions such as complete radio frequency management, automatic fault recovery, forced STA roaming and load balancing, and is easy to upgrade and expand. It can be perfectly integrated with the original network without changing its architecture, which greatly simplifies network deployment and management and saves user investment.

Datang Mobile’s wireless switches are implemented using a miniaturized ATCA platform. According to different WLAN network construction scale requirements, the specific RASTAP hardware platform can support as small as 6 slots, 2 slots, and as many as 14 slots and multiple slots. cascading, providing flexible building-block capacity expansion.

concluding remarks

The core advantage of RASTAP products is to accelerate time-to-market. By adopting RASTAP hardware, developers can shorten hardware development time and focus on value-added services. In addition to RASTAP’s good modularity in hardware, Datang Mobile also supports the standard and open OSCA software platform on the RASTAP platform. The effective combination of the two can provide a large number of rich application solutions and accelerate business applications and product development. It can be deployed to accelerate the development of communication networks, so as to provide users with richer services and better service experience.

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