KR0142495B1 - Traffic analyzing device - Google Patents

Abstract

The present invention relates to a method for performance analysis in a CDMA mobile communication system, and more particularly, to an apparatus for analyzing handoff characteristics and performance handoff and call related parameters as well as mobile stations, time zones, cell rings, and traffic statistics. It relates to an analysis method.

Description

A statistical analysis tool of traffic characteristics for CDMA mobile communication system

1 is a connection diagram of a main device and a traffic characterization device of a CDMA mobile communication system.

2 is a block diagram and data flow chart for each function of the apparatus for analyzing traffic statistical characteristics (SAT).

* Explanation of symbols for main parts of the drawings

1-a: GPS reception and TFC 1-b: base station controller

1-c: Radio Frequency Control Unit 1-d: CDMA Channel Transceiver

1-e: CCP 1-f: TSB

1-g: packet router 1-h: BSM

1-i: MDL

The present invention relates to a method for performance analysis in a CDMA mobile communication system, and in particular, an apparatus for analyzing handoff characteristics and performance handoff and call related parameters as well as mobile station, time zone, cellbell, and traffic statistics. It relates to an analysis method.

In general, when the code division multiple access (CDMA) scheme is applied, frequency reuse efficiency is much higher than that of a mobile communication system using frequency division multiple access (FDMA) and time division multiple access (TDMA) schemes. Because of its high, it is a popular method recently.

In particular, the advantage of the CDAM method is that all cells can use the same frequency used in the neighboring cell, so that the problem of arrangement and frequency of cell use in each cell when the system is installed and operated compared to the FDMA or TDMA method ) Has the advantage of being easy.

However, in the CDMA mobile communication system, the problem of optimizing various system parameters having a great influence on the system performance is an important task.

In the CDMA mobile communication system, the environment of the system such as an interference signal generated from an adjacent cell or a self cell, the number of mobile stations operating in each cell, the distribution of the mobile stations in each cell, the cell size, etc. In addition, the number of parameters used in the system in relation to the call, soft handoff, hard handoff, etc. have a great effect on the capacity and performance of the system.

As a method for system parameter planning and system performance analysis to solve the above problems, the CDMA mobile communication system is mainly collected through simulation and system tests by modeling and simulation. There is an actual test method that can adjust the system parameters by analyzing various data and messages, as well as the performance analysis of the system related to the radio link, as well as the traffic related statistical characteristics such as general calls and handoffs and related system parameters.

Among the above methods, the simulation method is not only inferior in sophistication due to the difference with the real environment, but also enormous work is required to perform this process for the whole system. There is a problem that the method is inefficient.

In addition, in the implementation of the system, in the implementation of the system, when collecting data and related messages at the base station and the network as well as the mobile station, and then analyzing data for a certain reference time, a very large amount of data is collected. There is a significant amount of difficulty in managing it.

Moreover, when the same reference time is not provided in each place where data is collected, it may be difficult to analyze the data collected by the various devices.

An object of the present invention for solving the above problems of the prior art is to collect the system parameters and related messages collectively in the network through the system test instead of the system simulation method as part of the parameter planning of the CDMA mobile communication system new In addition to efficiently analyzing traffic statistics related to call and handoff calls, the present invention relates to a method and method for configuring a software tool for analyzing parameters related to system performance measured by a mobile station.

Features of the present invention for achieving the above object, GPS reception and TFC (1-a), base station controller (1-b), radio frequency controller (1-c) and CDMA channel transceiver (1-d) and Traffic statistics characteristic of CDMA mobile communication system including CCP (1-e), TSB (1-f), BSM (1-h) and packet router (1-g) connected with the above configurations CLAIMS 1. An apparatus for analysis, comprising: means for collecting messages and parameters related to traffic statistics according to a service option from each of the configurations; Logged Data from MDL (2-a), Mapping of parameters and time Generation of temporary file (2-b), Call Event-specific parameters by ESN, to generate traffic statistical characteristic analysis data using various data collected by the above means sorting block (2-c), parameter sorting block (2_d) by Cell_id, FER and Pilot strength sorting block (2_e) by ESN, GT (2_h), Calculation Formatting for Statistics (2_f, 2_g), Frame Error Rate statistics by ESN (2_i, 2_j), ESN List Talk Time by ESN (2_k), Hardoff Duration by ESN (2_l), Hardoff Count by ESN (2_m), System Resouce Usage by ESN (2_n), Call Subscribers vs. Cells. Time (2_o), Call_Drop drop per cell Drop Reason (2_p) and Hardoff in_progress count per cell vs. It consists of Time (2_q).

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

1 shows a connection diagram of a main device of a CDMA mobile communication system and a performance analysis device according to the present invention.

The CDMA mobile communication system is largely composed of a mobile station, a base station, and a mobile communication switching station.

In the above configuration, the main apparatus of the base station system is, first, (1-a) receives timing information from the GPS (Global Positioning System) and transmits the relevant time information to the base station controller (BCP: 1-b) and the radio frequency controller (RFC). 1c) and serve as a CDMA channel transceiver (CE: 1-d).

The CDMA channel transceiver 1-d is a pilot channel transmitter that determines a cell boundary and provides a pilot signal used for initial system aquisition and data demodulation with a system at a mobile station. A synchronization channel transmitter for providing information necessary for synchronization with the mobile station, an access channel receiver for transmitting call control information to the network by the mobile station, and a paging channel for providing various information of the system to the mobile station. (paging channel) It consists of a transmitter, a traffic channel transceiver used to transfer voice information and specific control information between the mobile station and the network, respectively.

(1-b) not only transmits various call control related information received from the mobile station or the network through (1-g), but also manages the CDMA channels and manages the entire base transceiver system. Do this.

In particular, it allocates traffic channel resources when a call occurs and also manages the total power used in each channel.

(1-e) processes signaling information related to a call, and in particular, performs a decision function for hard handoff as well as soft handoff required by a mobile station.

And (1-f) provides functions related to power control of the forward and reverse links as well as providing a traffic channel between the CDMA traffic channel (1-d) and the mobile switching center required for a call with the mobile station, and (1-k). ) Performs maintenance and operation maintenance for the base station system as a whole.

In the system test environment using Service_option 2 and Service_option 1 (voice call), all necessary data and related messages not only in the wireless section but also throughout the system are logged in the Message Data Logger (MDL) (1-j).

The device transfers data and messages collected for a certain period of time to (1-k) through (1-m).

Referring to the attached FIG. 2, the apparatus for analyzing traffic statistics according to the present invention among the components operating as described above is as follows.

2 is a block diagram of functions and data flows of the SAT.

First, move the message and related parameters stored in the MDL (1-i) to (1-k) (2-a). Then, for the messages necessary for traffic statistics characterization, the resolution of 1.25 msec in each message is displayed. Visual information and parameters are extracted to generate an intermediate file (2-b).

The contents of this intermediate file are largely divided into three characteristics: parameter sorting block (2-c) for each ESN and call event, parameter sorting block (2-d) for each cell_id, frame error rate (FER) and pilot for each ESN. It consists of a signal strengh sorting block (2-e) and the like to generate relevant parameters for all mobile stations, ie ESNs, collected in the MDL (1-i).

First, the parameter sorting block (2-c) by call event by ESN is the time when the system parameters for statistical processing included in the message occurred in relation to all the call events described below occurred from the start of new call to the call release by mobile station. Function block to sort by.

The types of parameters related to call events handled here are service_option (1 or 2), which is the call mode in which the mobile station operates, the cell (cell_id) where each event occurred, the call (call), and the walsh for the traffic channel assigned by the network during handoff. There are system resources such as code channel, frame offiset, etc., and the strength of pilot signal received from neighbor base stations by mobile station when mobile station requests handoff according to radio environment during call progress in connection with handoff Pilot signal strength of Add_pilot, the number of pilot signals above the T_ADD (dB) greater than the pilot signal strength T_ADD (dB), and softer / soft handoff occurs In other words, as the mobile station moves more to the target cell area after the Add_cell procedure, the pilot signal strength of the home cell falls below T_DROP. Bureau include the pilot signal strength drop_pilot strength value when requesting a drop.

In addition, this block summarizes the above parameters even when a mobile station attempts multiple calls due to abnormal call termination, that is, call drop, within the test period. .

On the other hand, these parameters are linked to (1-d) from (1-f), which is passed from (1-e) to (1-f) in the case of test call by service_option 2, which is first started by (1-h). The service_option (2 or 1) parameter is obtained from the service_option field included in the message to connect.

Cell_id is provided in (1-f) when each call (new call or handoff call) occurs, and code_channel for frame_offset and traffic channel is allocated in (1-b) for each call (1-e) and ( The call drop reason logged through (1-j) through 1-f) is obtained through the abnormal call release reason in the call release message sent from (1-f) to MDL (1-i) when each call is dropped. The T_ADD and T_DROP values [dB] are obtained through the pilot signal strength included in the pilot signal measurement message reported by the mobile station to the network at the time of handoff (Add_pilot / Drop_pilot).

As a call event, Softer_Add, which is a soft handoff procedure between new and sectors, is based on the completion of setup of a land link between a base station and a network as well as a radio link between a base station and a mobile station by first attempting a call. And Soft_Drop, Softer_Swap, where the previous two procedures occur almost simultaneously, Softer_Add, Softer_Drop, which is a soft handoff procedure between cells, Softer_Swap, where the previous two procedures occur almost simultaneously, and when the frequencies used by each cell are different or one cell For hard handoff that can occur in a system environment using multiple frequencies in Intra_hard, which intercepts traffic channels with different frequencies in the same cell, Intra_hard that changes the frequency of traffic channels to other cells in the same cell, and in-progress calls are terminated. Call_release, etc., each time the event occurred (2-c) To clean up.

The parameter sorting block (2-d) for each cellid is a functional block for sorting the above parameters for each cell where each call event occurs.

The FER sorting block (2-e) for each ESN is a parameter included in the power_measurement_report_message received from the mobile station for each ESN time interval to obtain statistical data of the frame error rate of the forward link generated during the call progress for each mobile station. Function block that sorts the total number of frames and the number of frame errors by time.

The pilot strength sorting block (2-e) for each ESN is a functional block for sorting the strength of pilot signals received from neighbor base stations during the call progress for each mobile station over time.

ES2-List (2-k) showing ESN talk time and total number of mobile stations logged through (2-f) through format and calculation process necessary for statistics items by ESN from (2-c). (2-1), the number of handoffs generated by each ESN (2-m), the system resource usage and system parameter values (2-n) used by each ESN are displayed.

And through (2-g) through the required format and calculation process for the cell-specific statistics items from (2-d), the number of call subscribers per cell vs. time_interval (2-o), number of call_drops per cell vs. time_interval and call drop reason (2-p), number of handoff-in-progress vs. handoff by cell. outputs time_interval (2-q)

The items (2-o) to (2-q) may be obtained directly from (2-e) without passing through (2-d).

On the other hand, (2-k) represents the period from the call start time to the call end time for each mobile station, one mobile station can try a number of calls to try during the test period, the call time for each call (call) Outputs the mobile station for analysis by service_option (1 or 2).

(2-l) indicates the time progressed by handoff type such as softer handoff and soft handoff that occurred during call progress by service_option (1 or 2) by call (call) by mobile station, and when handoff of same type occurs It outputs the duration for each case, and outputs the total handoff duration of various types of handoffs and the no handoff duration excluding the time spent on handoffs in the channel holding time.

(2-m) is the sofet handoff (new softer handoff, softer handoff, softer_handoff, soft handoff), Intro_hard which occurred during call progress by mobile station, by door, by service_option (1 or 2). Outputs the number of occurrences of each handoff type, such as handoff and inter hard handoff.

Of course, when a particular mobile station attempts a plurality of calls, the above result is output for each call.

(2-n) indicates each call event by service_option by mobile station, namely new call, Softer handoff (Add_sector), softer handoff (Drop_sector), soft ahndoff (Add_Cell), soft handoff (Drop_Cell), intra_hard handoff, inter_hard handoff, etc. The cell where the call event occurred (Cell_id), the pilot signal strength of the serving cell and the target cell when the handoff occurred, and the strength of the pilot signal received by the mobile station from the adjacent base stations when the handoff occurred. The system resource usage and major measured parameter values such as the number of pilot above T_ADD, the code channel used for the new call or the handoff call, the frame_offset value, etc. are output.

(2-o) shows the number of call subscribers in each cell, that is, the system capacity of each cell, for a specific time zone or the entire time interval.

(2-q) outputs the number of call dropped mobile stations and the cause of call drop for each cell for a specific time zone or the entire time interval.

(2-q) outputs the number of handoff subscribers in each cell at a specific time zone so that it can be used to analyze traffic distribution, system resource usage and handoff characteristics for a specific time zone or the entire time interval.

And, the number of handoff subscribers is output as the average number of subscribers in each time interval.

In particular, the statistics items (2-o) to (2-q) may input different time zones and specific time zones for flexibility.

When the apparatus and method for analyzing the traffic statistical characteristics of the CDMA mobile communication system according to the present invention operating as described above are provided, the traffic statistical characteristic analysis based on a predetermined test scenario for more mobile stations and cells is provided. In addition, the system parameters can be adjusted by analyzing the traffic statistical characteristics of the operating system and the system performance related parameters measured by the mobile station and the base station.

In addition, as a test call for collecting traffic characteristic parameters and messages, a mobile loopback call (service option 2) and voice call (service option) for a specific test scenario or a CDMA mobile communication system in operation 1) can be used, and in case of using mobile loopback call, it generates data with statistical characteristics similar to voice signal in CDMA system that provides variable rate such as 8kbps, 4kbps, 2kbps, 0.8kbps and so on. It can be used by modeling as a second order markov process in which the transmission rate of the next frame is determined.

In addition, the traffic statistical characteristics analysis items include cell traffic statistics, softer / soft handoff and hard handoff performance, call drop reason, and handoff and call (call) and Various parameters can be analyzed.

In particular, it is possible not only to selectively take specific mobile stations for analysis, but also to analyze statistical characteristics of specific time zones, mobile stations, cells, and the entire system. .

In particular, it can be used for system parameter planning by analyzing parameters and statistical characteristics obtained in multicell and multiuser environments.

Claims (2)

GPS reception and TFC (1-a), base station controller (1-b), radio frequency controller (1-c), CDMA channel transceiver (1-d), CCP (1-e) and TSB (1-f) And a BSM (1-h) and a packet router (1-g) connected to the above components, the apparatus for analyzing the traffic statistics in the CDMA mobile communication system Means for collecting messages and parameters related to traffic statistics characteristics according to service options; Logged Data from MDL (2-a), Mapping of parameters and time Generation of temporary file (2-b), Call Event-specific parameters by ESN, to generate traffic statistical characteristic analysis data using various data collected by the above means sorting block (2-c), parameter sorting block (2_d) by Cell_id, FER and Pilot strength sorting block (2_e) by ESN, GT (2_h), Calculation Formatting for Statistics (2_f, 2_g), Frame Error Rate statistics by ESN (2_i, 2_j), ESN List Talk Time by ESN (2_k), Hardoff Duration by ESN (2_1), Hardoff Count by ESN (2_m), System Resource Usage by ESN (2_n), Number of Call Subscribers by Cell. Time (2_o), Call_Drop drop per cell Drop Reason (2_p), Hardoff in_progress count per cell vs. Apparatus for analyzing traffic statistics characteristics in a CDMA mobile communication system, characterized in that consisting of Time (2_q). GPS reception and TFC (1-a), base station controller (1-b), radio frequency controller (1-c), CDMA channel transceiver (1-d), CCP (1-e) and TSB (1-f) And a BSM (1-h) and a packet router (1-g) connected to the above configurations, the method for analyzing the traffic statistical characteristics in a CDMA mobile communication system comprising: Means for collecting messages and parameters related to traffic statistics characteristics according to service options, and to generate traffic statistics characteristics analysis data using various data collected by the means. Logged Data from MDL (2-a), Mapping of parameters and time Generation of temporary file (2-b), parameter sorting block (2-c) by Call Event per ESN, parameter sorting block (2_d) by Cell_id, FER and Pilot strength sorting block (2_e) by GTN, GT ( 2_h), Calculation Formatting for Statistics (2_f, 2_g), Frame Error Rate statistics by ESN (2_i, 2_j), ESN List by ESN Chemistry time (2_k), ESN-specific Hardoff Duration (2_l), ESN-specific Hardoff recovered (2_m), ESN-specific System Resource Usage (2_n), Cell-specific call number of subscribers vs. Time (2_o), Call_Drop number per cell Drop Reason (2_p) and Hardoff in_progress number per cell vs. A method for analyzing traffic statistics characteristics in a CDMA mobile communication system, characterized by comprising time (2_q).