3G local access network carrying Demand Analysis

There are many things worth learning about the 3G local access network. Here we mainly introduce the load requirements analysis of the 3G local access network. With the rapid development of 3G technology and applications, 3G local access network is facing a huge challenge. In this context, this article discusses the features of the 3G local access network to adapt to multi-service bearer and broadband, focuses on two different categories of solutions, the MSTP optimization scheme and the segmented bearer scheme comprehensively reviewed the implementation scheme of different technologies, analyzed and compared them, and finally put forward further suggestions on the evolution of the network.

Introduction

With the development of 3G services, mobile communication network services are gradually evolving from a single voice service to multimedia services such as voice, data, and video services, and higher network capacity is also required. In order to better meet the development of user scale and adapt to the development trend of Mobile Service IP and broadband, the mobile communication network needs to use TDM (Time Division Multiplex, Time Division multiplexing) and Asynchronous Transfer Mode, asynchronous transmission mode) the network evolves to an IP network. IP-based mobile networks can effectively optimize the network structure, achieve flexible networking, improve network capacity, improve transmission efficiency, reduce network construction costs and O & M costs, and thus enhance the competitiveness of operators in mobile networks. At present, the IP of mobile networks has become the overall strategic transformation direction of many operators and is accelerating the development of IP. After completing the IP-based transformation of the mobile core network, consider the convergence trend of fixed and mobile networks based on the bearer requirements of the 3G base station return service and the bearer requirements of major customer leased lines in the future, it is imperative to modify the IP address of the mobile access network to adapt to the transmission of High-Speed segmentation services.

3G local access network bearer Requirements Analysis

The 3G local access Network is mainly used to access and transmit services between the base station (Node B) and the Base Station Controller (Radio Network Control, RNC. Compared with a 2G network, the transmission interface of a 3G network device must support both E1 and ima ei interfaces and Ethernet interfaces (FE and GE ), this requires that the 3G local access network can carry multiple services, not only to meet the requirements of TDM services dominated by voice services, but also to meet the requirements of data services dominated by Ethernet services. Moreover, with the development of mobile multimedia services, the bandwidth of the 3G local access network needs to be higher. Therefore, the 3G local access network must have capabilities such as large capacity, high bandwidth, multiple services, and high reliability, in this way, the broadband IP service is supported at the network layer. In the planning and construction of 3G local access networks, the following requirements should be fully considered to meet the development of mobile multimedia services:

(1) high bandwidth
With the new air interface technology, such as High Speed Downlink Packet Access, HSDPA, and multi-Input/multi-output (Multiple Input Multiple Outpu, MIMO) the introduction of new technologies such as antennas will greatly increase the data rate of each user. Therefore, when constructing a transmission bearer network, the network bandwidth needs to be greatly increased to eliminate network bottlenecks and avoid congestion as much as possible.

(2) Segmentation
Data Services have the characteristics of burstable and high bandwidth. Therefore, only by making full use of the efficient statistical multiplexing function of the group network and the ability to dynamically allocate bandwidth can we meet the needs of efficient and low-cost transmission.

(3) Multi-Service bearer and multi-particle Scheduling
3G local access networks should provide a variety of easy-to-use standard interfaces to carry different services, such as TDM, Ethernet, and ATM. In addition, the Service scheduling, switching, and cross-connection capabilities of different layers, such as IP packet layer and TDM VC12, VC3, and VC4, are required.

(4) ability to differentiate services and differentiated QoS Services
3G local access networks should be able to distinguish different levels of mobile services based on 802.1 p, DSCP, IP ToS, and other information. When the network is congested, the bandwidth resources of High-QoS services are prioritized based on the service level to provide Differentiated Services.

(5) Telecom-Level Reliability
To meet the availability requirements of telecom-grade 99.999%, the 3G local access network should be able to implement 50 ms Protection Switching in case of link or node failure.

(6) smooth network upgrade and flexible Expansion
For operators, on the one hand, network construction is a step-by-step process to achieve wide coverage and deep coverage; on the other hand, we hope to meet the future business development needs through upgrading and resizing, this requires that the network be smoothly upgraded and resized to reduce network construction costs.

(7) business-oriented network O & M capabilities
To facilitate management and maintenance, the 3G local access network should have functions such as fault diagnosis, fault locating, and performance monitoring.

(8) precise synchronization
3G local access networks should provide necessary technical mechanisms to provide accurate clock and frequency synchronization to meet the synchronization needs of 3G mobile businesses.

(9) implement business isolation of the base station.