Detailed description of WCDMA soft relocation cutover technology (1)

Traditional wireless network sites need to be relocated, and services on the current network need to be interrupted. In addition, they can only be serially cutover one by one. The organizational work is complicated and the resource investment is huge, therefore, it is imperative to discuss a low-risk and fast network construction relocation and cutover solution. The zte bbu + RRU Base Station of ZTE Corporation Limited uses a distributed structure and combines the same-frequency network characteristics of broadband code division multiple access (WCDMA) to facilitate soft relocation and soft cutover. This solution uses the method of overlapping network construction and one-time cutover, without affecting the current network operation, and can be rolled back in time, which can greatly simplify the relocation and cutover work and reduce network risks.

Broadband code division multiple access (WCDMA) mobile communication systems have a variety of relocation and cutover solutions, which have now evolved from the hard relocation and cutover solutions of traditional wireless networks to the new soft relocation and soft cutover solutions. The application scenarios, technical principles, feasibility analysis, and implementation processes of each solution are deeply analyzed, which can provide theoretical and operational basis for engineering implementation.

1. dilemmas of traditional relocation and cutover Solutions

1.1 market demand for relocation and cutover

With the completion of the first wave of WCDMA network construction in the world, some of the operational networks that were first put into construction gradually exposed the system architecture defects, upgrade is required to support high-speed group access (HSPA ). How to achieve relocation and cutover without affecting the original network has become an important concern of operators.

1.2 traditional relocation and cutover Process

The traditional relocation cutover is to split the entire network according to the coverage, and choose a time with a low traffic volume, such as at night. The whole network migration and cutover work were completed step by means of relocation and optimization.

The traditional site relocation process is usually shown in 1.

The traditional relocation and cutover can be simply called "Hard relocation and hard cutover ".

The traditional relocation and cutover process has the following drawbacks:

On the night of the relocation, the business of the site will inevitably be interrupted. If the data center space is not large enough, the service interruption caused by serial operation takes longer.

On the evening of the relocation, a large number of engineering teams, test/optimization personnel, and engineering vehicles need to be invested in parallel.

Due to the huge resource investment, the resource scheduling on the night of the relocation was very complicated.

Due to resource restrictions, the number of one-time relocation sites is limited, resulting in a long network relocation cycle.

Repeated relocation, cutover, and optimization over a long period of time, resulting in huge workload of operators.

The long-term decline in network quality may result in the loss of users.

During the relocation process, the operator must constantly cooperate to complete data operations. In terms of personnel requirements and technical requirements, the operator will be overcharged.

1.3 launch of soft relocation soft cutover

The original intention of the operator's relocation is to remove old equipment, introduce new equipment, and improve the quality of the whole network.

Due to the existence of a large number of current users, no operator is willing to see that due to migration carelessness, a large number of user complaints may even result in the loss of customers, thus affecting the brand image. Therefore, the impact on network performance must be minimized during the relocation process to ensure that the network quality will not be significantly reduced during the relocation process. In view of this, it is imperative to actively explore soft relocation and soft cutover solutions.