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UE-Analysis-Clasification Tems Analysis

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UE-Analysis-Clasification Tems Analysis Powered By Docstoc
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T/P/N/ST Enrique Coeto Solis                                        ETC/SK/3G-04:046
Approved                                            Checked         Date               Rev       Reference

CE/EBS/CD/A Roberto Vaz                                             26/05/2010         PA2




                                               UE ANALYSIS                       CLASSIFICATION
                                               GUIDELINES




                                               Abstract

                                               The following document is a guideline to classify some of the
                                               problems found during UE analysis for the <operator> WCDMA
                                               network.




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T/P/N/ST Enrique Coeto Solis                                      ETC/SK/3G-04:046
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CE/EBS/CD/A Roberto Vaz                                           26/05/2010         PA2



     Revision history


                               Rev.            Modifications    Date            Author
                               PA1             First Draft      2004-24-21      T/P/N/ST Enrique Coeto Solis




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T/P/N/ST Enrique Coeto Solis                                                        ETC/SK/3G-04:046
Approved                                                  Checked                   Date                           Rev             Reference

CE/EBS/CD/A Roberto Vaz                                                             26/05/2010                     PA2



     CONTENTS


     1        INTRODUCTION............................................................................................ 5
     2        SCOPE .......................................................................................................... 5
     3        LONG CALL TEST ........................................................................................ 6
           3.1      Radio Frequency ................................................................................................... 6
              3.1.1     Missing neighbour relationship ...................................................................... 6
              3.1.2     Poor coverage ................................................................................................. 8
              3.1.3     Bad Ec/No ...................................................................................................... 9
           3.2      Site/System problem ........................................................................................... 10
              3.2.1      Unable to add/remove SC to/from the AS .................................................... 10
              3.2.2      ASU without MR .......................................................................................... 11
           3.3      Not classified ....................................................................................................... 12
              3.3.1     Ec/No dropping very fast.............................................................................. 12
              3.3.2     UE Tx Power down after RL removal .......................................................... 13
     4        SHORT CALL TEST ..................................................................................... 14
           4.1      Radio Frequency ................................................................................................. 14
              4.1.1     Poor coverage ............................................................................................... 14
              4.1.2     Bad Ec/No .................................................................................................... 16
           4.2      Site/System problem ........................................................................................... 17
              4.2.1      CM service reject .......................................................................................... 17
           4.3      UE Problem ......................................................................................................... 18
              4.3.1     UE freeze ...................................................................................................... 18
              4.3.2     Call attempt to the worst cell ........................................................................ 19
              4.3.3     Only one RRC Connection Request. ............................................................ 20
              4.3.4     Best SC removed from the AS ..................................................................... 21
              4.3.5     Motorola A835 incorrect sequence number ................................................. 22
           4.4      Not classified ....................................................................................................... 23
              4.4.1     L1 Synchronization problem ........................................................................ 23
              4.4.2     RRC Connection Request with no AICH ..................................................... 24
              4.4.3     RRC Connection Release after Radio Bearer Reconfiguration Complete. .. 26
              4.4.4     Out of synchronization RL ........................................................................... 27
           4.5          Other .................................................................................................................... 28




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T/P/N/ST Enrique Coeto Solis                                                       ETC/SK/3G-04:046
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CE/EBS/CD/A Roberto Vaz                                                            26/05/2010                    PA2



              4.5.1              RACH error .................................................................................................. 28




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     1             INTRODUCTION

     The purpose of this document is to simplify the consulting work, for both short and long
     call UE analysis. It describes the repeated problems found in the UE analysis for the
     WCDMA SmarTone’s network, in order to summarize them.

     Not all the problems can be classified because not all of them present regular symptoms.
     Anyway, some problems that only happened once are also described in order to keep a
     record of them.



     2             SCOPE
     This document is not intended as a guideline for trouble shooting the problems found in the
     UE analysis, but only for identifying them.




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     3             LONG CALL TEST

           3.1          Radio Frequency


           3.1.1 Missing neighbour relationship

     When the Ec/No of the serving cell becomes very bad and another SC becomes better than
     this cell in terms of Ec/No and the UE detects it as a “DN” (Detected Neighbour), then this
     is a missing neighbour relationship.

     DL BLER becomes worse and CPICH RSCP could be either good or bad. Sometimes the
     UE release the call because very bad Ec/No of the serving cell and sometimes the system
     release the call (to avoid UL interference) by sending RRC Connection release message
     with cause unspecified.




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                         DL BLER gets worse




                                                         “DN” cell better than the serving cell




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     3.1.2 Poor coverage

      The UE enters to a very bad coverage area, i.e. an area where RSCP > -105 dBm. Ec/No
     can be either good or bad, the UE ramps up its transmitting power to the maximum, DL
     BLER starts to increase and finally the call drops.




                                                                            UE max Tx power
                                                                            and
                                                                            high DL BLER
           Very bad RSCP




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           3.1.3 Bad Ec/No

     The UE enters to a very bad Ec/No area. RSCP is good or not so bad. The UE stops its
     transmitting power. DL BLER increases and, finally the call drops.




          DL BLER increases
                 And
         UE stops its Tx power




           Ec/No is very bad and RSCP is not very bad




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           3.2 Site/System problem


           3.2.1 Unable to add/remove SC to/from the AS

     The UE sends many Measurement Reports to add or remove a SC to or from the AS, but
     the system does not respond. Finally, the UTRAN finish the call by sending the RRC
     Connection release message with cause unspecified.




                                  Many MR to add SC274




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           3.2.2 ASU without MR

     The UE sends a MR to add an SC to the AS, but immediately after this SC is added, and
     even though the UE does not send any other MR, the system sends another Active Set
     Update to remove the SC that was just added to the AS.

     This can happen several times until the system sends the RRC Connection Release with
     cause unspecified.



       ASU to remove
      SC359 but no MR
      was sent by the UE




                                                                            SHO to add SC
                                                                             359 to the AS




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           3.3 Not classified


           3.3.1 Ec/No dropping very fast

     It seems like the phone call is on going with no problems but suddenly the CPICH Ec/No
     drops very fast and the UE stops its Tx power. Sometimes the UE stops its Tx Power even
     before the Ec/No drops. Usually only UE2 drops because it has only one SC in the AS and
     UE2 has two, but when UE2 has also one SC in the AS also drops at the same time than
     UE1. In the Uplink Signal Strength and Power Control Report inside the Mode Reports
     window, the message Disable UL Power Control can be found, as the picture below shows.




                                                                            Ec/No drops very
                                                                            fast and the UE
                                                                            stops its Tx power
            Only one SC in the AS




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           3.3.2 UE Tx Power down after RL removal

     Immediately after only one SC remains in the AS, the UE drops its transmiting power very
     fast. It is important to note that the UE does not stop its Tx power.




                                                                      UE Tx power goes
                                                                      down when only one
    RF Conditions are very good                                       SC remains in the AS




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     4             SHORT CALL TEST

           4.1 Radio Frequency


           4.1.1 Poor coverage

     The UE sends out 6 RRC Connection request messages but it does not get any answer from
     the UTRAN. The RF Conditions are very bad and the UE ramps up its power to the
     maximum. The UTRAN does not answer because the UE cannot reach the BTS.




        6 RRC Connection request




        Very bad RF Conditions                                   UE max Tx power




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           4.1.2 Bad Ec/No

     The UE makes a call attempt in a very bad Ec/No area, maybe the system answers the UE
     attempt but it cannot decode the answer because Ec/No is very bad. RSCP is good or at
     least no so bad, i.e. RSCP > -100 dBm, then this is not poor coverage.




        Very bad Ec/No and good RSCP




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           4.2 Site/System problem


           4.2.1 CM service reject

     During the call setup, the UE receives the CM service reject message with cause network
     failure, just after that, the system sends the RRC Connection release message. This is not an
     RF problem, is a network problem.




                                                                            CM Service reject
                                                                              with cause:
                                                                             Network failure




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           4.3 UE Problem


           4.3.1 UE freeze

     During the call setup the UE freeze, i.e. all the RF measurements are frozen. This is a UE
     problem.




                                                                        All measurements
                                                                            are frozen




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           4.3.2 Call attempt to the worst cell

     The UE makes a call attempt to a SC that is not the best server and later it does not have
     time make the HO because the Ec/No is very bad. This is a cell reselection problem
     because the UE should make the attempt to the best cell.




                                               The UE has no time
                                                to HO to the best
                                                     server




                                                                              Attempt to SC122,
                                                                               but SC267 is the
                                                                                  best server




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           4.3.3 Only one RRC Connection Request.

     The UE sends only one RRC Connection Request and does not receive the RRC
     Connection setup from the UTRAN. Immediately after this, the UE starts to read SIB. RF
     conditions are good. It is a UE problem because the UE does not re-transmit the RRC
     Connection Request.




                                                                         Only one RRC
                                                                       Connection Request
       Good RF Conditions                                             and the UE reads SIB




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           4.3.4 Best SC removed from the AS

     The UE sends a MR to remove the best SC from the AS. After this SC is removed the other
     ones in the AS become very bad in terms of Ec/No and the UE has no time to add it back to
     the AS.




                                                                      The UE sends a MR to
                                                                      remove SC204,which
                                                                      is the best server SC.




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           4.3.5 Motorola A835 incorrect sequence number

     The UE receives the identity request message and it sends the identity response to the
     system. After 12 to 14 seconds the UTRAN sends the RRC Connection release message
     with cause “Normal event”. Between the identity response message and the RRC
     Connection release, the UE sends the “setup” message and there could be many RL added
     and/or removed from the AS. The RF conditions can be either good or not so good.




      12 to 14
      seconds




      RF Conditions
      are OK




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           4.4 Not classified


           4.4.1 L1 Synchronization problem

     The UE sends the RRC Connection request message and it receives the RRC Connection
     setup, after this the UE must send the RRC Connection setup complete message, but it does
     not, then the UE ramps up its transmitting power to the maximum.




                                                                       The UE ramps up its
                                                                       power to the
                                                                       maximum.




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           4.4.2 RRC Connection Request with no AICH

     The UE sends out 6 RRC Connection request but it does not receive the RRC Connection
     setup from the UTRAN. The RF conditions could be very good or at least not very bad.
     There is not cell reselection and the UE does not ramp up the Tx power to the maximum, so
     it is not UL poor coverage. However, the UE does not get the AICH. It can be seen in the
     Random access reports, in the mode reports window.




           6 RRC Connection request




        RF conditions not very bad




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           6 RRC Connection request




        Very good RF conditions




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           4.4.3 RRC Connection Release after Radio Bearer Reconfiguration
                 Complete.

     Immediately after the UE sends the Radio Bearer Reconfiguration Complete, it receives the
     RRC Connection Release from the System with cause unspecified. The RF conditions does
     not matter, they can be good or bad.




         RF Conditions are good or not so bad




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           4.4.4 Out of synchronization RL

     In the AS there are two SC’s, RF conditions become very good for one of them and bad for
     the other, UE Tx power is low. It is assumed that the good radio link is out of
     synchronization because the DL BLER is increasing while the RF conditions become better
     for one SC. Finally the call drops because high DL BLER.




                                                                      DL BLER increases while
                                                                      SC183 is gets better and
                                                                        SC308 is gets worse




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           4.5 Other


           4.5.1 RACH error

     When a sequence is used to trigger a phone call during the drive test, sometimes the UE
     generates an internal message called “RACH error” and the UE does not send the RRC
     Connection request message, i.e. there is no call attempt, then this is not a call setup failure.
     Anyway, the message is recorded by TEMS investigation and TEMS Deskcat detects it as a
     call setup failure, it can be checked in the events window.




                                                                There is no call attempt




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Description: UE-Analysis-Clasification Tems Analysis