Planning and optimization of CDMA networks

Along with the technology renewal, the business development, the communication network also must unceasingly carry on the consummation and the development. China Unicom's CDMA network began construction in 2001, opened in early 2002, although the network development time is not long, but has experienced from scratch, from the process of excellent. At present, China Unicom CDMA Network has entered a new period of development: with the number of users and business volume of the growing, new business continues to launch, China Unicom needs to further enhance network coverage and network capabilities, and ultimately through High-quality Network and unique business to build CDMA boutique network brand.

In various periods of network development, different network and business situation will put forward different technical requirements for network planning. In view of the current development period of China Unicom CDMA Network, this paper simply analyzes the network planning and construction work in each period, probes into the technical requirements and problems needing attention in the 2004 network planning, and hopes to improve the quality of network planning work in the 2004.

First, several stages of China Unicom CDMA network development

A) to build a network covering 31 provinces (autonomous regions and municipalities), from scratch

At this stage, China Unicom CDMA Network Phase One project construction as the symbol. The main work is to build a high-quality CDMA is95a network nationwide, to provide users with CDMA voice services.

After the first phase of the project, China Unicom built a CDMA network covering more than 300 local networks, and the network capacity reached 15 million. Since January 8, 2002 opened trial run, by the end of 2002, the total network users have reached 7 million. (Computer science)

Business from scratch, providing 2G voice and data services based on IS95 network.

Second, optimize the network upgrade, provide CDMA1X data service

At this stage, China Unicom CDMA Network Phase II project as a symbol. The main work is to optimize and upgrade the network of the first phase project, and upgrade the whole network to CDMA1X network and construct cdma1x mobile data network.

Through the construction of Phase II project, China Unicom's CDMA network has been optimized and upgraded, and the network upgrades from IS95 to Cdma1x network, and has built a wireless data network covering 31 provinces (autonomous regions and municipalities).

Three business categories from less to more, the volume of business from small to large, network capabilities to further enhance the unique online business

At this stage, the China Unicom CDMA Network Phase III project construction as a symbol. The main goal is to build China Unicom's CDMA network at the end of 2004 with rivals "equal, each has characteristics" of the network, that is, in the Network service quality and competitors are equal, in the business Play CDMA1X network technology advantages, to provide unique wireless data services.

Since the second phase of the project, China Unicom CDMA Network quality and network coverage has been a faster upgrade, network capacity of more than 30 million, and has opened a variety of wireless data services, as at the end of September, the number of users on the internet has reached 15 million, of which the number of users up to 1.2 million. In order to adapt to the long-term development of network and business, China Unicom has made clear the development target of CDMA network under the new stage: By the end of 2004, the quality and network capability of CDMA network will be upgraded massively, and the technology advantage of CDMA1X network can be transformed into business advantage.

II. Technical Requirements for network planning in different network development periods

A) wireless network aspect

The first phase of the project covers a large, small configuration. The first phase of the project requires a minimum of investment to reach the national maximum coverage, for which a large number of single carrier frequency to the base station and repeater station. In order to ensure the scientific nature of network planning, the operation forecast of CDMA network is based on the data of GSM network, but in the site selection and base station configuration, the adjustment of traffic density is not enough, even at the end of 2002, 7 million users, some base stations have appeared the traffic overflow phenomenon.

Second phase project optimization and upgrade. Through the network optimization to make up for the first phase of the network in the coverage and capacity of the deficiencies, network upgrade to CDMA1X, through the upgrade and expansion of the overall upgrading of network capabilities. The configuration of some base stations and the adjustment of station site are used to increase the second carrier frequency in some traffic hotspots to enhance the network capability. Another requirement of Phase II project is to build a network of voice and data mixing, and make full use of IS95 Channel Board resources. In this way, the mixed configuration planning of voice and data is needed in network planning.

The third phase of the project to do fine, fine, optimized configuration. As the third phase of the project requirements in the network quality to reach the level of competitors, ability to support the business development at the end of 2004, which requires rigorous comparative testing and analysis in network coverage planning, the network capacity planning to accurately predict future voice and data traffic volume distribution based on the current network operation data.

(ii) switching network (circuit domain network) aspects

The first phase project small capacity multiple bureau. The first phase project planning requirement can form the network structure adapting to the long-term development of the business, capacity can meet the demand at the end of 2002. The configuration of the switch requires high processing power and low configuration on the interface and static capacity. In the first phase of the project, a special-purpose network and signaling network for CDMA network are constructed, which can meet the requirement of 30 million user capacity in the network structure.

Second phase of the project adjustment, expansion. In the network structure, through the addition of some switches to further improve the network, the expansion of some of the switches to meet the new business development needs. The second phase of the project does not adjust and enlarge the connection network and signaling transfer network.

The third phase Works less bureau, large capacity. The third phase of the project in principle does not adjust the network structure, make full use of the final capacity of the switch to enhance network capabilities. According to the current network traffic flow, the flow of detailed business forecasts, and in accordance with the future stages of business development level phased implementation. No structural adjustment is made to the connecting network and signaling transfer network, and only the network nodes are enlarged to meet the needs of network capability.

Third, the Wireless Intelligent Network (WIN) aspect

The first phase project forms the target net structure. Each MSC and Gmsc has an SSP function, a centralized SCP setting, and a requirement for SSP and SCP to accommodate forward new business development. Based on user development forecasts, the capacity configuration of SSP and SCP is controlled within a reasonable range.

Second phase of the project adjustment, expansion. Increase the number of SSP based on switching network adjustments, expand the SSP and SCP to enhance network capability, and build integrated SCP according to new business development needs.