Abstract:
A system and method by which a mobile wireless device dynamically decides the other end host to initiate a session to automatically conduct a performance test. Results of the performance test are then transferred to a monitoring server under appropriate conditions. A method for conducting a performance test on a wireless device comprises receiving information indicating how and when a performance test is to be conducted by the wireless device, determining whether the conditions for the performance test to be started are met, conducting the specified performance test, and storing results of the performance test.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS  
       [0001]     This application claims the benefit of Provisional Application No. 60/661,506, filed Mar. 15, 2005. 
     
    
     FIELD OF THE INVENTION  
       [0002]     The present invention relates to a system and method for monitoring the performance of applications on wireless networks, and more particularly, to initiating performance test, monitoring performance and collecting performance data for applications running on mobile wireless devices so as to determine the user experience.  
       BACKGROUND OF THE INVENTION  
       [0003]     Existing performance tools for wired and wireless networks measure performance between two end points for a given duration or session. The end-hosts are designated specifically for the purpose of measurement. For example, to measure throughput, a file of given size is transferred and the amount of time taken to complete the transfer is measured to derive the throughput. Other metrics of interest include delay, packet loss, coverage, jitter etc. Further, due to the nature of wireless connectivity, the device may be out of coverage during the performance session resulting in loss of performance data. This may lead to repeating the experiment resulting in waste of precious wireless resources such as mobile device battery and wireless bandwidth.  
         [0004]     Typically, performance tests are conducted between two end hosts which are selected a priori. This is not adequate in mobile networks as performance of the network needs to be determined at various locations and connectivity and coverage varies with location. Devices have to be placed at explicit locations to collect performance data. This is an expensive proposition and does not scale. Thus, the performance end-points need to be dynamically determined based on location and specific network conditions by using existing user devices already connected to the network.  
         [0005]     Another important consideration in mobile networks is when and how to send the results of performance data. Since, mobile device has to initiate, measure and collect performance data, the data has to be collected and stored and then transferred to a server when the network conditions are conducive for such a transfer. Since storage is a premium on mobile devices, a mechanism is needed to store the performance data in a small, fixed amount of storage and then communicate when the network conditions are right. In many cases, only the most recent performance data can be sent.  
         [0006]     Thus, there is a need to conduct performance tests that dynamically determines the end hosts and more efficiently stores the performance data and sends the results of performance data on-demand, or at periodic intervals or based on a threshold condition using different transport protocols.  
       SUMMARY OF THE INVENTION  
       [0007]     A system and method by which a mobile wireless device dynamically decides the other end host to initiate a session to automatically conduct a performance test. Results of the performance test are then transferred to a monitoring server under appropriate conditions.  
         [0008]     One aspect of the invention is a method by which the service manager informs the mobile device about the tests to be conducted, the conditions under which the test should be started (time, location, network condition) and when the results should be transmitted. Based on the size of the results generated by conducting performance tests, appropriate means of transport from a set is chosen.  
         [0009]     Another aspect of the invention is the methodology of conducting the actual test from the device to a specific end host. Once the request is received, the method involves monitoring the device conditions and network conditions to determine the appropriate moment to start the test. Certain tests have to be performed when the device is in certain state. For example, battery level or available memory on the device may be the condition to start the test. In other cases, it can be network conditions such as type of coverage or if the device is roaming. Further, the conditions under which the test is conducted can be any combinations of device state and network state. Based on the conditions the appropriate tests are initiated and test data collected by the mobile device.  
         [0010]     Another aspect of the invention is determining the appropriate parameters to use in the performance test. The parameters depend on the particular application and the type of the test. Once the application whose performance is needed is chosen, the type of test will determine the parameters. For real-time applications, the length of the session, the location of the content server is used to generate a synthetic transaction and the performance data is collected. Based on the network type, the appropriate destination naming (number or IP address) is chosen. For non real-time applications, the location or address of the end host is determined and a connection initiated to download specific payload. The status of the test as well as the location when it was initiated is recorded. The type of the test will determine additional parameters that will be needed to perform the test. A latency test will involve initiating a connection, and measuring the round trip time, where as throughput test will involve the size of the data to be used in the transfer.  
         [0011]     Yet another aspect of the invention is a method to efficiently store the results of the performance on the device and send it to the performance manager. Since, a mobile device is resource constrained, a fixed amount of storage has to be allocated for performance related data. The method involves using a fixed buffer and storing the results in a compact form to accommodate the results of a maximum number of tests as possible. The method further includes a means to store only the most recent results if the allocated storage is exhausted before the test results can be transferred to the service manager. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0012]     The drawing shown here in, along with the description, illustrates the invention.  
         [0013]      FIG. 1  is a diagram showing the architecture in which concepts underlying the described invention may be implemented.  
         [0014]      FIG. 2  is a diagram showing the test request sent by the service manager to the device.  
         [0015]      FIG. 3  is a test request record that shows the details of the test type and parameters sent to the device.  
         [0016]      FIG. 4  is a result state record that shows the details of the results obtained after conducting the specified tests.  
         [0017]      FIG. 5  is a test request response flow diagram that illustrates an aspect of the invention. 
     
    
     DETAILED DESCRIPTION  
       [0018]     An example of an architecture  100  in which concepts underlying the described invention may be implemented is shown in  FIG. 1 . In architecture  100 , a plurality of wireless devices, such as device  1   102  and device  2   104 , are communicatively connected via wireless infrastructure  106  and  108  and telecommunications network  110  to a content server  112  and to a service manager  114 . For example, device  1   102  and device  2   104  may communicate with each other via wireless infrastructure  108  and telecommunications network  110 . Likewise, device  1   102  may communicate with content server  112  and telecommunications network  110 . In addition, device  1   102  may communicate with service manager  114  via wireless infrastructure  106 .  
         [0019]     Device  1   102  and device  2   104  may be any type of wireless device, such as a wireless telephone, personal digital assistant (PDA), mobile email device, etc. Likewise, content server  112  may be any type of server system that is capable of serving content upon request. Service manager  114  is typically a server system that is used by manage the services provided by and to wireless (and other) devices, but may be any type of computer system capable of performing the necessary functions.  
         [0020]     It is to be noted that architecture  100  and the particular devices and communications arrangements shown in  FIG. 1  are merely examples. The present invention contemplates any and all architectures and communications arrangements.  
         [0021]     In one embodiment, the present invention includes a monitoring server sending commands to a wireless device, such as device  1   102 , to initiate connection from the wireless device to a specified content server, such as content server  112 , as well as from a wireless device, such as device  1   102 , to another wireless device, such as device  2   104 . In the example shown in  FIG. 1 , the monitoring server functionality is shown combined with service manager  114 . However, this is merely an example. The present invention contemplates the monitoring server functionality being combined with service manager  114 , the monitoring server functionality being implemented separately from service manager  114 , the monitoring server functionality being partially combined with service manager  114  and partially separate from service manager  114 , or any other combination or arrangement of functionality.  
         [0022]     An example of test measurement is shown in  FIG. 2 . In this example, monitoring server  202  transmits commands  204  via wireless infrastructure  206  to wireless device  208 . The various measurement options are sent as command parameters  210 . An example of command parameters  300  is shown in  FIG. 3 . Such parameters include an identifier  302  of the test request, an indicator  304  of the type of test to be performed, an indicator  306  of whether the test is to be performed periodically, one time only, or based on a threshold condition, an indicator  308  of any threshold conditions, an indicator  310  of a start time of the test, an indicator  312  of the period at which the test is to be periodically performed (if applicable), an indicator  314  of a location of the test, an identifier  316  of an application to be used to perform the test, an indicator  318  of a destination of the test, parameters  320  to be used by the application to be used to perform the test, and other conditions  322  relating to the mobile device. These parameters are merely examples of possible parameters; the present invention contemplates these and any other parameters that may be used.  
         [0023]     The measurement procedure involves monitoring the performance of connections and sessions explicitly initiated for purposes of measurement. The data collected includes performance parameters such as system availability, latency, throughput, spatial and temporal correlation of lost packets. The performance test may initiated by the server by sending performance parameters to the device, and device can explicitly monitor connection performance, session performance or application performance and send back the results to monitoring server. An example of a test response  400  is shown in  FIG. 4 . Response  400  include information such as an identifier  402  of the test request, an identifier  404  of the test that was performed, an identifier  406  of the response to the test, an indicator  408  of any error status resulting from the test, an indicator  410  of a start time of the test, an indicator  412  of the transfer time for data transferred during the test, an indicator  414  of a size of the data transferred during the test, an indicator  416  of a state of the device that was tested, an indicator  418  of a state of the network that was used for the test, and an indicator  420  of a type of connection used for the test. This information is merely an example of possible information that may included in the response; the present invention contemplates this and any other information that may be used.  
         [0024]     The performance conduit may be either device to server, such as between device  1   102  and content server  112 , shown in  FIG. 1 , or device to device, such as between device  1   102  and device  2   104 , shown in  FIG. 1 .  
         [0025]     The performance test may be initiated on-demand (by request from the server), periodically at specified intervals, or based on a threshold condition. The threshold condition can be a combination of device state and network state.  
         [0026]     An example of a process  500  to monitor and measure connection, session and application performance from the wireless terminal is shown in  FIG. 5 . It is best viewed in conjunction with  FIGS. 3 and 4 . Process  500  begins with step  501 , in which the device to be tested is sent a start command for performance monitoring with parameters such as those shown in  FIG. 3 . For example, the parameters may include when the test should start  310 , how often to repeat monitoring  312 , when to report back results, the return transport (SMS or HTTP) for sending the test results, and the type of test  304 , such as whether the test is device to device or device to server measurement.  
         [0027]     In addition to the above, depending on the type of application, additional parameters may be sent as detailed below:  
         [0028]     For Multimedia Messaging Service (MMS) tests, additional parameters such as a destination number  318 , a message size to generate, and a status of the test (sent/failed/success) may be used. Upon success of the test, the device may report back both the transfer start time, and the received/current time in GMT back to the server (with the difference being the duration). In addition, the current location in the from of the cell ID, the lai, and the GPS coordinates of the wireless device may be sent.  
         [0029]     For Wireless Access Protocol (WAP) tests, additional parameters such as a destination URL  318 , connect and download pages at the URL, and a status of the test (success/failed) may be used. If successful, then additional data may include a connect time and download time, (where the sum of both times equals the total time of test), the start time  410  in GMT of the test and the end time GMT of the test, the cell ID, the lai, GPS coordinates of the wireless device, and the data size downloaded  414 .  
         [0030]     For HyperText Transfer Protocol (HTTP) tests, additional parameters such as a destination URL  318 , connect and download pages at the url, and a status of the test (success/failed) may be used. If successful, then additional data may include a connect time and download time, (where the sum of both times equals the total time of test), the start time  410  in GMT of the test and the end time GMT of the test, the cell ID, the lai, the GPS coordinates of the wireless device, and the data size downloaded  414 .  
         [0031]     For VOICE tests, additional parameters such as a destination number, how long to hold the call, and a status of test (success/failed/busy) may be used. Additional data may include a start/end time in GMT, the cell ID, the lai, and the GPS coordinates of the wireless device.  
         [0032]     For VIDEO tests, additional parameters such as a destination number, a length of the clip (size), and a status of test (success/failed/busy) may be used. Additional data may include a start/end time in GMT, the cell ID, the lai, and the GPS coordinates of the wireless device.  
         [0033]     In step  502 , the device monitors its state and the state of the network over which the test is to be conducted. The device and network states are compared to the conditions that were established for the test to start, as communicated by parameters in the test request. The performance test component on the mobile device automatically conducts tests when the specified conditions are met. The conditions can be combinations of device and network state. In step  503 , the device determines that the conditions are true, and, in response, in step  504 , the device initiates the performance tests. Upon completion of the performance tests, the device stores the test results, and in step  506 , the device transmits the test results to the destination device for the test results. The collected results can be transferred to a service manager only when it is appropriate to do so. The local store and transfer of results will result in efficient use of limited resources on the mobile device.  
         [0034]     This invention will provide the wireless application providers with vital information about the quality of service (QOS) for various applications provided to wireless users, different wireless networks, technologies, and independent operators.  
         [0035]     Although specific embodiments of the present invention have been described, it will be understood by those of skill in the art that there are other embodiments that are equivalent to the described embodiments. Accordingly, it is to be understood that the invention is not to be limited by the specific illustrated embodiments, but only by the scope of the appended claims.