KR100819698B1 - Apparatus and Method for Quality Analysis of CDMA 2000 1x EV System - Google Patents

Abstract

The present invention provides a quality analysis apparatus and method for analyzing a cause of an error and responding according to the cause when an error occurs while a mobile communication terminal receives packet data in a CDMA200 1x EV network.

The quality analysis apparatus of the present invention includes an error message collecting unit for collecting an error message from a mobile communication terminal and a wireless environment analysis for checking whether a wireless environment for a CDMA2000 1x EV network is above a specified level as an error message is transmitted from the mobile communication terminal. The error determination unit determines the cause of the error according to the verification result of the wireless environment analysis unit, and the wireless environment is poor as a result of the field optimization unit and the wireless environment analysis unit that optimize the wireless environment in the area where the mobile communication terminal is located according to the error cause. If not, a link environment analysis unit for analyzing a link environment between the mobile communication terminal and the CDMA2000 1x EV network and optimizing the link environment according to the analysis result is included.

Description

Apparatus and Method for Quality Analysis of CDMA 2000 1x EV System

1 is a configuration diagram of a mobile communication network to which the present invention is applied;

2 is a detailed configuration diagram of a quality analysis apparatus according to the present invention;

3 is a flowchart illustrating a quality analysis method according to an embodiment of the present invention;

4 is a diagram for describing a link balance phenomenon.

<Description of the symbols for the main parts of the drawings>

10: quality analysis device 102: control unit

104: error message collection unit 106: wireless environment analysis unit

108: error determination unit 110: field optimizer

112: link environment analysis unit 114: message generation unit

116: interface 118: memory

The present invention relates to an apparatus and method for analyzing a quality of a mobile communication network. More specifically, when an error occurs while a mobile communication terminal receives packet data in a CDMA200 1x EV network, the cause of the error can be analyzed and responded according to the cause. It relates to a quality analysis apparatus and method.

CDMA2000 1x is an evolution of the 2nd generation service that provides improved data rates and a wide range of services. The CDMA2000 1x has been enhanced with CDMA2000 1x EV systems, including CDMA2000 1x EV-DO and CDMA2000 1x EV-DV. .

CDMA2000 1x EV is a technology that transmits data or voice and data in CDMA2000 1x. Since the service downloaded from the system by the mobile terminal is dominant due to the characteristics of packet data, CDMA2000 1x EV has a structure in which the forward and reverse channel rates are different. Significant improvements in forward channel maximum data rates support data rates of about 2.4576 Mbps in the forward direction and about 307.2 Kbps in the reverse direction.

In particular, the CDMA 2000 1x EV-DO system refers to a technology for transmitting only data in the CDMA 2000 1x system. The CDMA 2000 1x EV-DO system is currently used interchangeably with the CDMA 2000 1x system. That is, the EV-DO system and the CDMA 2000 1x system are configured together in one base station or base station controller, and the operations are controlled to be performed independently of each other.

In addition, the CDMA2000 1x EV-DO is more versatile due to its increased data rates and capacities, such as wireless Internet access, real-time traffic information, VOD (Video On Demand), wireless live broadcasting, TV, movies, music videos, Internet games, and wireless commerce. It can provide rich multimedia contents in the field. CDMA2000 1x EV-DO is an asymmetric link structure suitable for internet traffic characteristics and can cope with channel environment changes using various modulation schemes. In addition, there is an advantage in supporting handoff between CDMA2000 1x and CDMA2000 1x EV-DO and providing voice and high-speed packet data services to heterogeneous terminals.

However, in such a CDMA2000 1x EV system, a picture breakup, a break, or a buffering problem may occur while using a moving image service such as a video on demand (VOD) service.

The video frame is composed of an I frame and a P frame. The I frame is a frame decoded independently without referring to another frame, and becomes a reference frame of the P frame and is larger than the P frame. In general, a plurality of P frames are inserted and transmitted between I frames, and the number of P frames is determined according to the frame rate per second of the type I frame interval of the content. The P frame is decoded with reference to an I frame or a previous P frame and has a disadvantage in that the P frame cannot be decoded correctly when there is no reference frame.

Screen dropping occurs when a server providing a packet data service skips and transmits some frames when the wireless environment becomes poor or, in the worst case, does not transmit a frame. In addition, when an error occurs in some I frames or P frames due to the influence of the radio wave environment, it may occur because the mobile communication terminal deletes the P frame after the error frame and decodes and displays the next I frame.

On the other hand, the screen is broken, or the screen is distorted or looks like a mosaic during VOD playback. When an error occurs in some I frames or P frames due to radio wave problems, the mobile terminal does not delete the frame in which the error occurs. Occurs by using as a reference frame.

In addition, the buffering phenomenon occurs when there is no audio packet in the buffer of the mobile communication terminal, and is caused by buffering the audio packet or the video packet in order to reproduce the VOD. In the mobile communication terminal, a predetermined amount of video packets must be buffered for VOD playback, and all packets are transmitted and stored at the beginning of VOD playback in the audio buffer. If the audio buffer is empty, of course the video buffer is also empty, and the audio and video packets must be buffered for VOD playback.

As described above, in the current CDMA2000 1x EV system, there is a problem in that the quality of service is deteriorated due to screen breakage, interruption, or buffering during content playback.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides an apparatus and method for quality analysis of a CDMA2000 1x EV system capable of accurately determining the cause of an error occurring when packet data is reproduced in a CDAM2000 1x EV system. I am.

Another technical problem of the present invention is to improve packet data service quality by presenting different countermeasures for each cause of an error in a CDMA2000 1x EV system.

According to an aspect of the present invention, there is provided an apparatus for analyzing a quality of a CDMA2000 1x EV system, including: an error message collector configured to collect an error message from a mobile communication terminal; A wireless environment analyzer for checking whether a wireless environment for the CDMA2000 1x EV network is greater than or equal to a predetermined level as an error message is transmitted from the mobile communication terminal; An error determination unit that determines a cause of an error according to a check result of the radio environment analysis unit; A field optimizer for optimizing a wireless environment in an area where the mobile communication terminal is located according to the error cause; And a link environment analysis unit for analyzing a link environment between the mobile communication terminal and the CDMA2000 1x EV network and optimizing the link environment according to the analysis result when the radio environment analysis unit confirms that the wireless environment is not poor. .

In addition, the quality analysis method of the CDMA2000 1x EV system according to an embodiment of the present invention includes a first step of confirming whether or not a wireless environment is above a specified level when receiving an error message from a mobile communication terminal in a CDMA2000 1x EV traffic state; A second step of determining a cause of an error when it is confirmed that the wireless environment is poor as a result of the first step; A third step of checking whether a failure occurs in the CDMA2000 1x EV system when the cause of the error is the broken screen or the broken screen; A fourth step of performing field optimization for a region where the mobile communication terminal is located when a failure of the CDMA2000 1x EV system does not occur as a result of the checking of the third step; A fifth step of checking whether a failure occurs in the link environment when it is determined that the wireless environment is not bad as a result of the checking of the first step; And a sixth step of changing the environment of the reverse link when the reverse link fails by checking whether the reverse link has failed when the link environment has failed as a result of the checking of the fifth step.

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

1 is a block diagram of a mobile communication network to which the present invention is applied.

As shown, the quality analysis apparatus 10 according to the present invention is connected to the mobile communication terminal 20 and the CDMA2000 1x EV system 30, the CDMA2000 1x EV system 30 is an access network transceiver subsystem (ANTS) 310, an access network controller (ANC) 320, a data location register (DLR) 330, and an access network authentication, authorization, accounting (340).

The ANC 320 allows the mobile communication terminal 20 to access the CDMA2000 1x EV-DO system 30 through the ANTS 310 and manages the plurality of ANTS 310. The DLR 330 receives and manages subscriber information and session information for each subscriber through the ANTS 310, and stores and manages an ID of each ANTS 310. The AN-AAA 340 receives the necessary information from the ANTS 310 for the service request of the mobile communication terminal 20, performs a function of authenticating and permitting, and transmits the result to the ANTS 310.

On the other hand, as the quality analysis device 10 according to the present invention transmits an error message while using the CDMA2000 1x EV service from the mobile communication terminal 20, the type of error is analyzed and the cause of the error is analyzed. According to the present invention, the wireless environment is optimized, and a message related to an error occurrence situation is transmitted to the communication terminal of the operator through the CDMA2000 1x EV system 30.

Errors occurring while the mobile communication terminal uses the moving picture service provided from the CDMA2000 1x EV network may be divided into a broken screen, a broken screen, and a buffering. If an error occurs, the quality analyzing apparatus 10 identifies the type of error and analyzes the cause of the error, and suggests an optimal countermeasure according to the cause, thereby improving the packet data service quality.

2 is a detailed configuration diagram of a quality analysis device according to the present invention.

As shown, the quality analysis apparatus 10 according to the present invention is an interface 116 for transmitting and receiving signals to and from the control unit 102, the mobile communication terminal 20 and the CDMA2000 1x EV system 30 for controlling the overall operation , A memory 118, an error message collecting unit 104, a wireless environment analyzing unit 106, and an error determining unit storing various parameters for quality analysis, information collected from the mobile communication terminal 20, and quality analysis results. 108, a field optimizer 110, a link environment analyzer 112, and a message generator 114.

The detailed description of each component is as follows.

First, the error message collector 104 is connected to the CDMA2000 1x EV system and collects and stores the error message in the memory 116 as the error message is transmitted from a mobile communication terminal using a packet data service such as a moving picture service.

When an error message is transmitted from the mobile communication terminal, the wireless environment analysis unit 106 checks whether the wireless environment of the CDMA2000 1x EV network of the mobile communication terminal maintains a specified level. For example, the radio environment analyzer 106 measures signal to interference ratio (C / I) in a CDMA2000 1x EV network.

In addition to C / I, parameters for analyzing the quality of the wireless environment include a packet error rate (PER) and a received power. Since the reproduced packet data is transmitted through the application layer, the packet error rate using the radio link layer is It is not necessary to consider. In addition, it has been confirmed that the reception power does not affect the quality of service if it is more than -106dBm, and thus it is unlikely that the reception power will directly affect the packet data quality of service, and this may not need to be considered in the present invention. Do.

Next, the error determination unit 108 determines whether any error among the screen break, the screen break, or the buffering phenomenon occurs according to the C / I measured by the wireless environment analyzer 106.

For example, when the average C / I lasts more than a specified time (for example, 4 seconds) in a state of exceeding about -6 dB or less and -8 dB, it is determined that a screen break or a screen break occurs. In addition, it is determined that a buffering phenomenon occurs when the average C / I is maintained for more than a specified time (for example, 20 seconds) that is less than or equal to −8 dB.

In addition, when it is determined that the buffering phenomenon has occurred, it is preferable that the error determination unit 108 checks whether a call truncation phenomenon has occurred. This is because 85% of the buffering phenomena occur in poor wireless environments where the average C / I is about -8 to -15 dB, resulting in call truncation.

On the other hand, the field optimizer 110 optimizes the wireless environment in the region where the mobile communication terminal is located, if the cause of the error is not in the system failure. For example, power control of the neighboring base station, antenna angle and swing control of the neighboring base station, and handoff parameter (T_ADD, T_DROP, etc.) control may be performed.

Next, the link environment analysis unit 112 checks the reverse and forward link environments for the mobile communication terminal, and optimizes the link environment according to the check result.

If the forward link serving base station is not the base station controlling the reverse link transmission power, it is determined that the mobile communication terminal is in a link imbalance state. The mobile station shall transmit the DRC to the serving base station at a specified period, and if the minimum channel state capable of transmitting the DRC is ensured, the base station is said to be in the DRC lock state, and the best base station for the forward link is the reverse link. If it is not the best, the base station is said to be in the DRC unlocked (unlock) state.

4 is a diagram for explaining a link imbalance phenomenon, in which a solid line represents reverse coverage and a dotted line represents omnidirectional coverage.

In FIG. 4, the first cell 32 has a wider forward coverage than the reverse coverage, and the second cell 34 is vice versa.

When the mobile communication terminal moves from the area A to B, the forward channel environment from the base station of the first cell 32 is maintained, but the reverse channel environment is poor. Accordingly, if the mobile communication terminal cannot transmit the DRC to the base station of the first cell 32, the mobile station cannot switch to the base station of the second cell 34 even though the signal from the first cell 32 continues to be weakened. As a result, an error occurs while using the packet data service.

In addition, in the area C, if the first cell 32 is assumed to have excellent C / I, the mobile communication terminal cannot transmit the DRC to the base station of the first cell 32, resulting in a decrease in data throughput. An error occurs while using the service.

As such, the link imbalance phenomenon occurs because the forward coverage of the cell and the reverse coverage do not coincide, especially when the reverse coverage is narrower than the forward coverage, and the radio environment problem such as multipath fading, the base station And a hardware problem of the repeater receiver, a base station reception band noise, and the like, and the link environment analyzer 112 improves the link environment so that an error does not occur when a link imbalance phenomenon occurs.

Lastly, if an error occurs in the terminal using the packet service in the CDMA2000 1x EV network, the message generator 114, the above-described radio environment analyzer 106, field optimizer 110, and link environment analyzer ( A message including the processing result of 112 is generated and transmitted to the operator terminal.

As described above, when the error occurs in the terminal using the packet data service in the CDMA2000 1x EV network, the quality analyzing apparatus 10 determines the type of error and analyzes the cause according to the type of error. By doing so, it is possible to improve the wireless environment.

3 is a flowchart illustrating a quality analysis method according to an embodiment of the present invention.

First, the error message collection unit 104 of the quality analysis device 10 is connected to the mobile communication terminal 20, when an error occurs in the mobile communication terminal in the CDMA2000 1x EV traffic state, and receives an error message from the mobile communication terminal. Collect (S101).

Thereafter, the radio environment analyzer 106 checks the level of the omni-channel propagation environment of the CDMA2000 1x EV network (S103). That is, to check the C / I value for the CDMA2000 1x EV network. Then, it is determined whether the wireless environment is poor according to the confirmed C / I value (S105).

Then, the cause of the error is determined according to the determination result of step S105 (S107). If the average C / I value lasts more than 4 seconds in a state of -6 dB or less, it is determined that the error is caused by a broken screen or a broken screen. If C / I value lasts more than 20 seconds with -8db or less, it is determined that the error is caused by buffering.

First, when it is determined that the error is due to the broken or broken screen, the wireless environment analysis unit 106 checks whether a failure occurs in the corresponding CDMA2000 1x EV base station (S109), and when the failure does not occur in the base station, the field optimizer In operation 110, the field optimizer 110 controls power control of the neighboring base station, antenna angle and swing control of the neighboring base station, or a handoff parameter (for example, T_ADD, T_DROP, etc.) (S111). ).

If a failure occurs in the base station as a result of checking in step S109, the message generating unit 114 generates a message for notifying it and transmits it to the operator (S119).

On the other hand, if it is determined in step S105 that the call is not disconnected due to a poor radio environment, the link environment analyzer 112 checks whether or not a call break occurs due to a problem such as link balance (S113). If it is determined that there is a problem, it is determined whether the reverse link is disabled (S115), and if there is a failure in the reverse link, the cause is analyzed (S117). Here, if the result of the call disconnection is not a failure of the link environment as a result of check in step S113, if the cause of the call disconnection is not in the reverse link failure as a result of the check in step S115, proceed to step S119 to notify the operator of the call disconnection situation. It is preferable to generate a message for transmission and then send it.

Next, if the cause of the error is buffering as a result of the checking in step S107, the radio environment analyzer 106 checks whether a call truncation phenomenon has occurred (S121). As a result of the check, when the arc cutting phenomenon does not occur, the flow proceeds to step S109.

In a preferred embodiment of the present invention, after performing the field optimization (S111), if the service quality is not improved, it is preferable to optimize the wireless network environment by examining the establishment, relocation, etc. of the base station or repeater.

According to the present invention, when an error such as a broken screen, a broken line, a buffering, or the like occurs for a mobile communication terminal in a CDMA2000 1x EV traffic state, the wireless environment can be improved by analyzing the cause of the error.

Those skilled in the art to which the present invention described above belongs will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. Therefore, the above-described embodiments are to be understood as illustrative in all respects and not as restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

According to the present invention, when an error occurs in a mobile communication terminal in a traffic state of a CDMA2000 1x EV network, it is possible to improve the packet data service quality by accurately identifying the type of error.

In addition, when a service error occurs, it is possible to correctly and quickly cope with a service failure by checking whether the error is caused by any one of a screen broken, broken, and buffered, and responding according to each case.

Claims (14)

A quality analysis device connected to a mobile communication terminal and analyzing the cause of an error in packet data transmitted from a CDMA2000 1x EV network, An error message collecting unit collecting an error message from the mobile communication terminal; A wireless environment analyzer for checking whether a wireless environment for the CDMA2000 1x EV network is greater than or equal to a predetermined level as an error message is transmitted from the mobile communication terminal; An error determination unit that determines a cause of an error according to a check result of the radio environment analysis unit; A field optimizer for optimizing a wireless environment in an area where the mobile communication terminal is located according to the error cause; And A link environment analysis unit for analyzing a link environment between the mobile communication terminal and the CDMA2000 1x EV network and optimizing the link environment according to the analysis result when the radio environment analysis unit confirms that the radio environment is not poor; Quality analysis device comprising a. The method of claim 1, The wireless environment analysis unit, the quality analysis device, characterized in that for checking the signal to noise ratio (C / I (Signal to interference ratio) for the CDMA2000 1x EV network. The method of claim 2, If the average value of the signal-to-noise ratio (C / I) measured by the wireless environment analyzer continues for more than 4 seconds in a state exceeding -6 dB or less and -8 dB, the error determining unit determines that the screen is broken or the screen is broken. Quality analysis device, characterized in that. The method of claim 2, And the error determining unit determines that a buffering phenomenon has occurred when the average value of the signal-to-noise ratio (C / I) measured by the wireless environment analyzer continues for 20 seconds or less in a state of -6 dB or less. The method of claim 4, wherein The error determining unit, the quality analysis device, characterized in that for checking whether a call disconnection phenomenon has occurred. The method of claim 1, The field optimization unit, power control of the base station around the mobile terminal, the antenna angle and swing control of the base station, the quality analysis device, characterized in that for performing a handoff parameter control. The method of claim 1, The link environment analyzer determines whether the mobile communication terminal is in a link imbalance (Link Imbalance) state, the quality analysis device, characterized in that for changing the reverse link environment in the link imbalance state. The method of claim 1, The quality analyzing apparatus further comprises a message generating unit which generates a message including an error situation according to the error cause and transmits the message to an operator terminal. A quality analysis method for analyzing a cause of call disconnection of a mobile communication terminal connected to a mobile communication terminal in a CDMA2000 1x EV traffic state, the method comprising: A first step of confirming whether the wireless environment is above a specified level when receiving an error message from a mobile communication terminal in a CDMA2000 1x EV traffic state; A second step of determining a cause of an error when it is confirmed that the wireless environment is poor as a result of the first step; A third step of checking whether a failure occurs in the CDMA2000 1x EV system when the cause of the error is the broken screen or the broken screen; A fourth step of performing field optimization for a region where the mobile communication terminal is located when a failure of the CDMA2000 1x EV system does not occur as a result of the checking of the third step; A fifth step of checking whether a failure occurs in the link environment when it is determined that the wireless environment is not bad as a result of the checking of the first step; And A sixth step of changing the environment of the reverse link when the reverse link fails by checking whether there is a failure in the reverse link when a failure occurs in the link environment as a result of the fifth step; Quality analysis method comprising a. The method of claim 9, If the CDMA2000 1x EV system fails as a result of the checking in the third step, If the link environment does not occur as a result of the fifth step, And seven steps of generating a message including the call disconnection situation and the fact that a system failure occurs in any one of the cases in which the reverse link has not failed, as a result of the checking of the sixth step. Quality analysis method. The method of claim 9, The second step is to determine whether the signal to noise ratio (C / I (Signal to interference ratio)) of the CDMA2000 1x EV system in the radio environment lasts more than the time specified by a value of -8 to -6dB. Quality analysis method. The method of claim 9, The fourth step is a step of performing power control for the neighboring base station, antenna angle and swing control or handoff parameter control of the neighboring base station. The method of claim 9, A second step of checking whether call truncation has occurred when the cause of error is a buffering phenomenon; and returning to the third step if call truncation has not occurred as a result of the checking of the eighth step Quality analysis method characterized in that. The method of claim 13, And a ninth step of performing an analysis process for each cause of the call cutting when the call cutting occurs as a result of the checking of the eighth step.

Images