Call-drop Evaluation and Analysis Solution

Background
      With the development of communication network and the increasing of users, voice calling service has been an important means of communication in daily life, and thus users’ demands on voice service quality is increasing day by day. Therefore, all operators list the voice call-drop indicators as an important indicator for network quality evaluation.

      The call-drop indicators of existing network are evaluated by a single interface and signaling message, which is only suitable for statistical evaluation on the basic wireless network elements, but fails in a real correct evaluation on the user perception of the existing network.

Solution overview
      To achieve a real and objective evaluation and analysis on the user call-drop, ZCTT has performed a research on the end-to-end perception call-drop based on signaling as for the problem of user call-drop evaluation and analysis.

      Through the research, a new 2/3G user end-to-end perception call-drop evaluation and analysis product has been developed to achieve an evaluation that is more close to the real user perception, and at the same time complete a whole network analysis on the voice call-drop by analysis of the end-to-end voice call-drop so as to accurately locate the network problems, solve the existing hidden troubles and faults in the network (including wireless network, core network and terminal) in time, and further improve the network quality and user perception.

1. Call-drop evaluation and analysis product
   Call-drop evaluation and analysis product uses the single interface signaling record of MC interface and C/D interface, and makes the end-to-end correlation of multi-interface and multi-service records according to user’s mobile location and call service condition to generate an end-to-end integrated call service record that can restore a real user’s service scenario.

   This product uses the features of end-to-end integrated call service record to define the user perception call-drop. The service records, which are not released by users, are considered as user perception call-drop, and divide the call-drop into 4 types based on different releasing bodies: abnormal core network release, abnormal BSC\RNC release, abnormal user terminal release and abnormal wireless quality difference user release.

   End-to-end user perception call-drop evaluation and analysis product for  2/3G users call can make a deep analysis on  end-to-end integrated call service record according to the new call-drop type, and  forms special user perception call-drop analysis features such as user perception call-drop evaluation and analysis, user perception call-drop evaluation and analysis of GSM call, user perception call-drop evaluation and analysis of TD call, user perception call-drop evaluation and analysis of local call, user perception call-drop evaluation and analysis of intra-provincial long-distance call, user perception call-drop evaluation and analysis of inter-provincial long-distance call, user perception call-drop evaluation and analysis of inter-network call, user perception call-drop evaluation and analysis of special-service call, wireless call-drop statistical analysis, user perception call-drop evaluation and analysis of terminal and statistical analysis of user perception call-drop cause.

2. Functions  introduction
    a) End-to-end integrated call service record
    End-to-end integrated call service record refers to the end-to-end integrated service record of 2/3G user, including the end-to-end service record of call service and calling process.
    The end-to-end service record of call service is an end-to-end integrated call service correlation of calling service record, MAP service record, CAP service record, BICC service record, tone-ringing service record and called service record that are related to users.
    The end-to-end of call process means to make end-to-end correlation of switching records caused by call record and position mobility.
    Two correlations are unified to form an integrated end-to-end service record to describe one-time user call.

    b) User perception call-drop evaluation and analysis
    This function can implement an end-to-end user call-drop evaluation and analysis according to cities, network elements, covered areas to perform an integrated perception call-drop analysis and evaluation for different regional users.
 - User perception call-drop evaluation and ranking based on cities
 - User perception call-drop evaluation and ranking based on POOL
 - User perception call-drop evaluation and ranking based on end offices
 - User perception call-drop evaluation and ranking based on BSC\RNC

    c) User perception call-drop evaluation and analysis of GSM user call
This function can perform an end-to-end user call-drop evaluation and analysis for GSM users according to cities, network elements, covered areas to implement an integrated perception call-drop analysis and evaluation for different regional users.

    d) User perception call-drop evaluation and analysis of TD user call
    This function can perform an end-to-end user call-drop evaluation and analysis for TD users according to cities, network elements, covered areas to implement an integrated perception call-drop analysis and evaluation for different regional users.

    e) User perception call-drop evaluation and analysis of local call
    This function can implement a fine analysis of local call (intra-office call, intra-POOL call and inter-POOL call).

    f) User perception call-drop evaluation and analysis of provincial long-distance call
    This function can implement a statistical analysis and inter-city comparative analysis on call-drop.

    g) User perception call-drop evaluation and analysis of inter-provincial long-distance call
    This function can implement inter-provincial call statistical analysis by provinces and its comparative analysis.

    h) User perception call-drop evaluation and analysis of inter-network call
    This function can implement an analysis for inter-network call by operators and the comparative analysis among operators.

    i) User perception call-drop evaluation and analysis of special service call
    This function can implement the monitoring and analysis for the quality of special service platform.

    j) Wireless call-drop statistical analysis
    This function can implement a wireless evaluation and analysis for user perception call drop and locate the high call-drop cell and base station.

    k) Terminal user perception call-drop analysis
    This function can implement the user terminal evaluation and analysis for user perception call drop to locate the high call-drop terminal.

    Applications
    At present, mobile user call drop analysis solution has been applied in many cities successfully.