06 wo na03 e1_1 umts access control-113

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06 wo na03 e1_1 umts access control-113

  1. 1. UMTS Access Control ZTE University
  2. 2. Content      UMTS System Information Broadcasting UMTS Paging UMTS Random Access UMTS RRC Connection Setup and Release Access Failed Case
  3. 3. System Broadcasting  The system information broadcasted over the BCH channel mainly includes the following contents:         Public Land Mobile Network (PLMN) ID, location area (LA), route area (RA) Information on the timers and counters related to the Radio Resource Control (RRC) connections Configuration information of the UTRAN registration area (URA) Cell selection and reselection parameters Parameters for configuring the common channels, such as FACH, PCH, and RACH Information on the uplink interference related to the auxiliary power control UE measurement control message over the idle or common channel Parameters of the adjacent cell
  4. 4. System information     Master information block (MIB) Schedule block (SB) System information block (SIB) ZTE UTRAN supports SIB1, SIB2, SIB3, SIB5, SIB7, SIB11, SIB11bis, SIB18. MIB SB1/SB2 SIB1 SIB2 SIB3/4 SIB15 SIB5/6 SIB7 SIB18 SIB11/1 2
  5. 5. Scheduling levels of the SIBS Information blocks scheduled by MIB: SB, SIB1, SIB2, SIB3, SIB5, SIB7 Level 2 Information blocks scheduled by SB1: SIB11, SIB18 Level 1  Broadcast interval of level 2 >= broadcast interval of level 1
  6. 6. SIB Block SIB Content Controlled by SIB1 the CN information, UE behavior related timers and counters RNC SIB2 URA ID of a cell RNC SIB3/4 cell selection and cell reselection RNC SIB5/6 common transport channels and common physical channels RNC SIB7 parameters needed in the calculation of the PRACH preamble power RNC/NodeB SIB11/12 cell measurement control information. RNC SIB 11bis Compensation of SIB 11 RNC SIB 15 Information for location service RNC SIB 18 the PLMN tag of neighbor cell RNC
  7. 7. System broadcasting
  8. 8. SIB1  SIB1 mainly contains the CN information, UE behavior related timers and counters.               T300 N300 T312Idle N312Idle T302 N302 T304 N304 T305 T307 T308 N308 T309 T312 Connected              N312Connected T313 N313 N315 T314 T315 T316 T317 T3212Cs ATTIndCs NMOPs Kcs Kps
  9. 9. SIB1
  10. 10. SIB2  SIB2 specifies the URA ID of a cell. With SIB2, the UE in the URA_PCH state can update the URA. Parameter Name Parameter Description URANum Number of UTRAN registration areas URA[4] ID of a UTRAN registration area
  11. 11. SIB3/SIB4  Parameters in SIB3 and SIB4 are related to the cell selection and cell reselection. SIB3 contains information required by the UE in Idle mode. SIB4 contains information required by the UE in Connected. If SIB4 is not sent, the UE in Connected mode can also receive SIB3.
  12. 12. SIB3/SIB4 Parameter Name Cid QualMeas SIntraSearchPre SIntraSearch SInterSearchPre SInterSearch SSearchHCS Pre SSearchHCS SSearchRat SHCSRatPre SHCSRat SLimitRat QQualMin QRxLevMin DltaQRxLevMinPr DltaQRxLevMin Parameter Description Cell ID Measurement Quantity for Cell Selection and Reselection Sintrasearch Configuration Tag The threshold that triggers the intra-frequency measurement in the cell reselection process Sintersearch Configuration Tag The threshold that triggers the inter-frequency measurement in the cell reselection process SsearchHCS Configuration Tag The threshold that triggers the measurement in the HCS cell reselection process The threshold that triggers the inter-system measurement in the cell reselection process SHCS,RAT Configuration Tag The threshold that triggers the inter-system measurement in the HCS cell reselection process The threshold that triggers the inter-system cell measurement in the cell reselection process The minimum cell quality requirement level The minimum cell receive electrical level threshold DeltaQrxlevmin Configuration Tag The minimum cell receive electrical level threshold increment
  13. 13. SIB5/SIB6  SIB5 and SIB6 are mainly used to configure the common transport channels and common physical channels. SIB5 contains the parameters of the auxiliary common control channels in IDEL mode; SIB6 contains the parameters of the common physical channels or shared physical channels in connected mode. The UE in Idle mode uses SIB5; the UE in connected mode uses SIB6. If SIB6 does not exist, the UE in the connected mode also uses SIB5.
  14. 14. SIB5/SIB6 Parameter Name TfsIndex ChType TfNum TrBlkNum RlcSize TTI CodingRate RateMatchAttr CRCSize NiNumPerFrame CPCId MichPwr MichChCode Parameter Description Transmission format index. It is used to indicate the attributes of a transport channel, including channel type, transport format number, number of transport blocks, transport block size, transmission time interval, coding rate, rate matching attribute. Channel Type Transport Format Number Number of Transport Blocks Transport Block Size Transmission Time Interval Coding Rate Rate Matching Attribute CRC Size Number of NI per Frame Common Physical Channel ID Power(dB) Channelisation Code No.
  15. 15. SIB5/SIB6 Parameter Name SttdInd SttdInd ChCode AichTranTime AichPwr MplexPos PCHInd DlScraCode ChCode ChCode SttdInd CPCId PichPwr SttdInd Signature AvailSubChanNum AvailableSF Parameter Description STTD Indicator AICH STTD Indicator AICH Channelisation Code No. AICH Transmission Timing AICH Power Multiplexing Position Indicator for SCCPCH Carrying PCH SCPICH Scrambling Code SCPICH Channelisation Code No PICH Channelisation Code No. PICH STTD Indicator Pich Common Physical Channel ID PICH Power PCCPCH STTD Indicator Available Signature PRACH Available Subchannel Number PRACH Available SF
  16. 16. SIB5/SIB6 Parameter Name PreamScraCode PcpichPwr PunctLimit SignalFach TfcsIndex CtfcNum Ctfc SCCPCHUsage SccpchOffset SttdInd DlScraCode DlChCodeNo SlotFmt SttdInd Parameter Description PRACH Preamble Scrambling Code P-CPICH Power(dBm) Puncturing Limit FACH Usage Index of a transmission format combination set. It must be configured for S-CCPCH or PRACH. Number of transmission format combination sets. It must be configured for S-CCPCH or PRACH. ID of a transmission format combination. It must be configured for SCCPCH or PRACH. SCCPCH Usage SCCPCH Frame Timing Offset SCCPCH STTD Indicator S-CCPCH Scrambling Code S-CCPCH Channelisation Code No. S-CCPCH Slot Format P-CPICH STTD Indicator
  17. 17. SIB7  SIB7 is the system information block that is updated periodically. The timer of SIB7 is calculated as follows:    Expiration timer = MAX(32,SIB_REP * ExpirationTimeFactor) SIB_REP is the transmission interval of SIB7 and is obtained at the time of broadcast scheduling; ExpirationTimeFactor is the timeout factor of SIB7 and is set to 2 invariably. SIB7 contains the parameters needed in the calculation of the PRACH preamble power. Parameter Name Parameter Description DynPstLevelInit Initial Dynamic Persistence Level
  18. 18. SIB11/SIB12  SIB11/SIB12 is used to configure cell measurement control information. SIB11 specifies the measurement control information required by the UE in Idle mode. SIB12 specifies the measurement control information required by the UE in FACH state. If SIB12 is not broadcasted, the UE in connected mode can also use the configuration information specified by SIB11.
  19. 19. SIB18  SIB18 specifies the PLMN tag that must be considered by the UE in Idle or connected mode. Parameter Name Parameter Description NMCC Mobile Country Code of Neighboring Cell NMNC Mobile Network Code of Neighboring Cell
  20. 20. SIB11bis  The content of SIB11bis is same with SIB11, it can alleviate the lack of SIB11 space when there is too many adjacent cells. Parameter Description Parameter Name SIB11ORSIB11BIS Specify if an adjacent cell information can be broadcast through SIB11bis
  21. 21. Waiting Time After UE Sending RRC CONNECTION SETUP REQUEST Message Parameter Name T300 Description The timer is started after the UE sends the RRC CONNECTION REQUEST message. The T300 timer is stopped when the message RRC CONNECTION SETUP is received, when the timer expires and the retransmit event count is smaller than N300, the UE retransmits the RRC CONNECTION SETUP REQUEST message. Range and Step ( 100 , 200 , 400 , 600 , 800 , 1000 , 1200 , 140 0 , 1600 , 1800 , 2000 , 3000 , 4000 , 6000 , 8000 Default Value Configuration Path 2000ms ) ms View->Configuration Management->RNC NE->RNC Radio Resource Management->Advanced Parameter Manage ->UE Timers and Constants Infomation ->Waiting Time After UE Sending RRC CONNECTION SETUP REQUEST Message(T300)(ms)
  22. 22. Maximum Number of Retransmissions of the RRC CONNECTION REQUEST Message Parameter Name N300 Description If the T300 timer expires and the retransmit event count is equal to or larger than N300 but the RRC CONNECTION SETUP message has not been received, the UE enters the Idle mode. Range and Step [ 0, 7] 3 Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->Advanced Parameter Manage ->UE Timers and Constants Infomation ->Maximum Number of Retransmissions of the RRC CONNECTION REQUEST Message (N300)
  23. 23. Waiting Time for Receiving "In Sync" from L1 in Idle Mode Parameter Name T312Idle Description The timer is started when the UE starts to establish the dedicated channel. When the UE finds the number of synchronization indications received from layer 1 is equal to N312Idle, the T312 timer is stopped. If the timer expires, the physical channel setup fails. Range and Step [ 1 , 15 ] s 2s Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->Advanced Parameter Manage ->UE Timers and Constants Infomation ->Waiting Time for Receiving "In Sync" from L1 in Idle Mode (T312 in Idle Mode) (s)
  24. 24. Maximum Number of "In Sync" Received from L1 in Idle Mode Parameter Name N312Idle Description The smaller the parameter, it is easier to judge whether the synchronization finishes, but the chance of fake synchronization also increases; the larger the parameter, the higher the reliability, but it is more time consuming. Range and Step [ 0 , 11 ] 10 Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->Advanced Parameter Manage ->UE Timers and Constants Infomation ->Maximum Number of "In Sync" Received from L1 in Idle Mode (N312 in Idle Mode)
  25. 25. Waiting Time After UE Sending CELL/URA UPDATE Message Parameter Name T302 Description The counter is started when the UE sends the CELL UPDATE or URA UPDATE message; the counter is stopped when the UE receives the CELL UPDATE CONFIRM or URA UPDATE CONFIRM message. If the counter T302 expires but the number of retransmitted messages is smaller than N302, the UE retransmits the CELL UPDATE or URA UPDATE message. Range and Step ( 100 , 200 , 400 , 600 , 800 , 1000 , 1200 , 140 0 , 1600 , 1800 , 2000 , 3000 , 4000 , 6000 , 8000 Default Value Configuration Path 1000ms ) ms View->Configuration Management->RNC NE->RNC Radio Resource Management->Advanced Parameter Manage ->UE Timers and Constants Infomation ->Waiting Time After UE Sending CELL/URA UPDATE Message(T302)(ms)
  26. 26. Maximum Number of Retransmissions of the CELL/URA UPDATE Message Parameter Name N302 Description When the T302 counter expires and the number of the CELL UPDATE or URA UPDATE messages sent by the UE is larger than or equal to N302, the UE enters the Idle mode. Range and Step [ 0, 7] 2 Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->Advanced Parameter Manage ->UE Timers and Constants Infomation ->Maximum Number of Retransmissions of the CELL/URA UPDATE Message (N302)
  27. 27. Waiting Time After UE Sending UE CAPABILITY INFORMATION Message Parameter Name T304 Description When the UE sends the UE CAPABILITY INFORMATION message, the timer is started; when the UE receives the UE CAPABILITY INFORMATION Confirmed message, the timer is stopped. When the T304 timer expires and the number of the CAPABILITY INFORMATION messages sent by the UE is smaller than N304, the UE retransmits the UE CAPABILITY INFORMATION message. Range and Step ( 100 , 200 , 400 , 1000 , 2000 ) ms 2000ms Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->Advanced Parameter Manage ->UE Timers and Constants Infomation ->Waiting Time After UE Sending UE CAPABILITY INFORMATION Message(T304) (ms)
  28. 28. Maximum Number of Retransmissions of the UE CAPABILITY INFORMATION Message Parameter Name N304 Description When the T304 counter expires and the retransmit event count is equal to or larger than N304, the UE starts the CELL UPDATE process. Range and Step [ 0, 7] 2 Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->Advanced Parameter Manage ->UE Timers and Constants Infomation ->Maximum Number of Retransmissions of the UE CAPABILITY INFORMATION Message (N304)
  29. 29. Period of Cell/URA Update When UE is in CELL_FACH/CELL_PCH/ URA_PCH State Parameter Name T305 Description The T305 timer is started when the UE enters the CELL_FACH, or CELL_PCH/URA_PCH state. When the UE receives the CELL UPDATE CONFIRM or URA UPDATE CONFIRM message, the T305 timer is stopped. When the T305 timer expires and the UE detects its own serving cell, the UE sends the CELL UPDATE message; when the T305 timer expires and the UE is not in the serving cell, it starts the T307 timer. Range and Step ( no update , 5 , 10 , 30 , 60 , 120 , 360 , 720 ) Default Value min 5min Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->Advanced Parameter Manage ->UE Timers and Constants Infomation -> Period of Cell/URA Update When UE is in CELL_FACH/CELL_PCH/ URA_PCH State(T305)(min)
  30. 30. Waiting Time for Cell Reselection After UE is out of Service Parameter Name T307 Description The parameter specifies the waiting time between the time when the UE leaves the serving cell and the time when the UE reselects the cell. The smaller the parameter, more quickly the UE can reenter the network, but this may increase the load of the UE and the system. Range and Step ( 5 , 10 , 15 , 20 , 30 , 40 , 50 ) s 5s Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->Advanced Parameter Manage ->UE Timers and Constants Infomation ->Waiting Time for Cell Reselection After UE is out of Service(T307)(s)
  31. 31. Waiting Time After Sending RRC CONNECTION RELEASE COMPLETE Message in CELL_DCH State Parameter Name T308 Description The T308 timer is started after the UE sends the RRC CONNECTION RELEASE COMPLETE message. When the T308 timer expires and the number of the RRC CONNECTION RELEASE COMPLETE messages sent by the UE is smaller than N308, the UE retransmits the RRC CONNECTION RELEASE COMPLETE message. Range and Step ( 40 , 80 , 160 , 320 ) ms 80ms Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->Advanced Parameter Manage ->UE Timers and Constants Infomation ->Waiting Time After Sending RRC CONNECTION RELEASE COMPLETE Message in CELL_DCH State(T308) (ms)
  32. 32. Maximum Number of Retransmissions of the RRC CONNECTION RELEASE Message Parameter Name N308 Description When the T308 counter expires and the number of the RRC CONNECTION RELEASE COMPLETE messages sent by the UE is larger than or equal to N308, the UE enters the Idle mode. Range and Step [ 1, 8] 1 Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->Advanced Parameter Manage ->RNC Radio Resource Management -> Maximum Number of Retransmissions of the RRC CONNECTION RELEASE Message(N308)
  33. 33. Waiting Time After Requesting Connection Establishment in Other System(eg. GSM) Parameter Name T309 Description When the UE receives the CELL CHANGE ORDER FROM UTRAN message, the T309 timer is started; when the UE in the new cell successfully receives the response to the connection setup request, the T309 timer is stopped. If the T309 timer expires, the UE returns to the original UTRAN. Range and Step [ 1, 8] s 8s Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->Advanced Parameter Manage ->UE Timers and Constants Infomation ->Waiting Time After Requesting Connection Establishment in Other System(eg. GSM) (T309)(s)
  34. 34. Waiting Time for Receiving “In Sync” from L1 In Connected Mode Parameter Name T312Connected Description The timer is started when the UE starts to establish the dedicated channel. When the UE finds the number of synchronization indications received from layer 1 is equal to N312, T312 is stopped. If the T312 timer expires, the physical channel setup fails. Range and Step [ 1 , 15 ] s 1s Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->Advanced Parameter Manage ->UE Timers and Constants Infomation ->Waiting Time for Receiving “In Sync” from L1 In Connected Mode(T312 in Connected Mode)(s)
  35. 35. Maximum Number of "In Sync" Received from L1 in Connected Mode Parameter Name N312Connected Description The smaller the parameter, it is easier to judge whether the synchronization finishes, but the chance of fake synchronization also increases; the larger the parameter, the higher the reliability, but it is more time consuming. Range and Step ( 1 , 2 , 4 , 10 , Default Value 20 , 50 , 100 , 200 , 400 , 600 , 800 , 1000 ) 1 Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->Advanced Parameter Manage ->UE Timers and Constants Infomation ->Maximum Number of "In Sync" Received from L1 in Connected Mode (N312 in Connected Mode)
  36. 36. Waiting Time After DPCCH Established in CELL_DCH State Losing Sychronization Parameter Name T313 Description When the number of synchronization loss indications received by the UE in the DCH state from layer 1 reaches the value of N313, the UE starts T313. When the UE receives synchronization indications from layer 1 for N315 times, it stops the T313 timer. When the T313 timer expires, the radio links involved in the lost synchronization fail. Range and Step [ 0 , 15 ] s 3s Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->Advanced Parameter Manage ->UE Timers and Constants Infomation ->Waiting Time After DPCCH Established in CELL_DCH State Losing Sychronization (T313)(s)
  37. 37. Maximum Number of Successive "Out of Sync" Received from L1 Parameter Name N313 Description The smaller the parameter, it is easier to judge whether the synchronization finishes, but the chance of fake synchronization also increases; the larger the parameter, the higher the reliability, but it is more time consuming. Range and Step ( 1 , 2 , 4 , 10 , 20 , 50 , 100 , 200 ) 50 Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->Advanced Parameter Manage ->INFORMATION ON THE CONSTANTS OF THE UE COUNTER AND TIMER ->Maximum Number of Successive "Out of Sync" Received from L1(N313)
  38. 38. Maximum Number of Successive "In Sync" Received from L1 During T313 is Activated Parameter Name N315 Description The smaller the parameter, it is easier to judge whether the synchronization finishes, but the chance of fake synchronization also increases; the larger the parameter, the higher the reliability, but it is more time consuming. Range and Step ( 1 , 2 , 4 , 10 , 20 , 50 , 100 , 200 , 400 , Default Value 600 , 800 , 1000 ) 1 Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->Advanced Parameter Manage ->UE Timers and Constants Infomation ->Maximum Number of Successive "In Sync" Received from L1 During T313 is Activated ( N315)
  39. 39. Waiting Time for Completion of Cell Update When Radio Link Fails and Radio Bearer(s) Associated with T314 Exist Parameter Name T314 Description When the criteria for radio link failure are fulfilled, T314 is started if radio bearer(s) that are associated with T314 exist or if only RRC connection exists only to the CS domain. When the Cell Update procedure has been completed, T314 is stopped. Range and Step ( 0 , 2 , 4 , 6 , 8 , 12 , 16 , 20 ) s 4s Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->Advanced Parameter Manage ->UE Timers and Constants Infomation ->Waiting Time for Completion of Cell Upate When Radio Link Fails and Radio Bearer(s) Associated with T314 Exist (T314)(s)
  40. 40. Waiting Time for Completion of Cell Update When Radio Link Fails and Radio Bearer(s) Associated with T315 Exist Parameter Name T315 Description When the RB is set up, the system uses T314 or T315 for the RB. When the radio link fails and the current RB uses T315, the system starts T315. When the cell updating process finishes, the system stops T315. Range and Step ( 0 , 10 , 30 , 60 , 180 , 600 , 1200 , 1800 ) 30s s Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->Advanced Parameter Manage ->UE Timers and Constants Infomation ->Waiting Time for Completion of Cell Upate When Radio Link Fails and Radio Bearer(s) Associated with T315 Exist (T315)(s)
  41. 41. Waiting Time for Cell Selection/Reselection After UE is out of Service in CELL_PCH/URA_PCH State Parameter Name T316 Description When the UE in the PCH state leaves the serving cell, the system starts the T316 timer; when the UE detects the serving cell, the system stops the T316 timer. When the T316 timer expires, if the UE is in the serving cell, it initiates the cell updating; if the T316 timer is not in the serving cell, it starts the T317 timer and switches to the FACH state. When the UE detects the serving cell, it starts the cell updating. Range and Step ( 0 , 10 , 20 , 30 , 40 , 50 , Infinity ) s 0s Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->Advanced Parameter Manage ->UE Timers and Constants Infomation -> Waiting Time for Cell Selection/Reselection After UE is out of Service in CELL_PCH/URA_PCH State(T316)(s)
  42. 42. Waiting Time for Cell Selection/Reselection After UE is out of Service in CELL_FACH State Parameter Name T317 Description When the T316 timer expires, the system starts the T317 timer; when the UE in the FACH leaves the serving cell, the system starts the T317 timer. When the UE detects the serving cell, it stops the T317 timer. Range and Step ( 0 , 10 , 30 , 60 , 180 , 600 , 1200 , 1800 ) 0s s Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->Advanced Parameter Manage ->UE Timers and Constants Infomation ->Waiting Time for Cell Selection/Reselection After UE is out of Service in CELL_FACH State(T317)(s)
  43. 43. Mobile Country Code Parameter Name MCC Description The parameter specifies the mobile country code. Range and Step [ 0 , 999 ] 460 Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->CN NAS Configuration Information ->Mobile Country Code
  44. 44. Mobile Network Code Parameter Name MNC Description The parameter specifies the mobile network code. Range and Step [ 0 , 999 ] Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->CN NAS Configuration Infomation>Mobile Network Code
  45. 45. CN Domain Supported Parameter Name CnDomain Description The parameter specifies the supported CN domains. Range and Step 0: CS Domain 1: PS Domain 2: CS+PS Default Value 2: CS+PS Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->CN NAS Configuration Infomation ->CN Domain Supported
  46. 46. Timer for Periodic Location Update Parameter Name T3212Cs Description The parameter specifies the interval at which the location information is reported. The smaller the parameter, it is easier to judge the real location. Range and Step ( 0 , 25.5 ) hours Step0.1hour 1 hour Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->Advanced Parameter Manage ->CN System Infomation ->Timer for Periodic Location Update(T3212)(hour)
  47. 47. URA Number Parameter Name URANum Description The parameter specifies the number of URAs for the current cell. The system supports up to 4 URAs. Range and Step [ 1, 4] N/A Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->UtranCell->UtranCell Global Information ->URA Number
  48. 48. URA Identity Parameter Name Description Range and Step Default Value Configuration Path URA [ 4 ] The parameter specifies the No. of the URA to which the current area belongs. [ 0 , 65535 ] N/A View->Configuration Management->RNC NE->RNC Radio Resource Management->UtranCell->UtranCell Global Information ->URA Identity
  49. 49. Cell Identity Parameter Name CId Description The parameter specifies the ID of a cell and is used to distinguish different cells. Range and Step [ 0 , 65534 ] N/A Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->UtranCell->UtranCell Global Information ->Cell Identity
  50. 50. Content      UMTS System Information Broadcasting UMTS Paging UMTS Random Access UMTS RRC Connection Setup and Release Access Failed Case
  51. 51. Paging Flow
  52. 52. PAGING TYPE 1  When the UE is in the Idle, or URA_PCH state, the RNC receives the paging message from the CN and then sends the paging message of PAGING TYPE 1 over the PCH channel to the UE. To improve the chance of receiving the paging message by the UE, the RNC repeatedly sends the paging message of PAGING TYPE 1 to the UE.
  53. 53. Page Indicator  The PCH channel has a corresponding PICH physical channel. The page indicator (PI) is transmitted over the PICH channel, with each PI corresponding to a group of UEs. The following lists the formula for calculating the PI:     PI = DRX Index mod Np Where: DRX Index = IMSI div 8192 Np = the number of PIs included in a PICH frame.
  54. 54. Page Indicator  The UE judges whether the network is paging itself by monitoring its own PI. Each PICH frame can contain the PI of multiple UEs. The more the parameter Np, the larger the transmit power of the PICH will be. Number of PIs in each frame 18 36 72 144 Number of repeated bits in the PICH 16 8 4 2 Transmit power of the PICH in comparison with that of the CPICH -7 -7 -5 -2 288 bits for paging indication b0 b1 12 bits (transmission off) b287 b288 One radio frame (10 ms) b299
  55. 55. Paging Occasion  For saving power, the UE in the Idle or PCH state monitors the PICH channel in the Discontinuous Reception (DRX) mode. In the DRX mode, the UE monitors the PI once every DRX period. That is, each UE has its own paging occasion (PO). The UE monitors each PICH frame in the corresponding SFN and finds its own PI in the frame according to the calculated PI. Therefore, the RNC fills in the PI in the message transmitted over the PICH channel according to the paging occasion of the UE. DRX period = 2k frames
  56. 56. Paging Occasion  Paging Occasion = {(IMSI div N) mod (DRX cycle length div PBP)} * PBP + n * DRX cycle length + Frame Offset      Where: N = number of SCCPCH channels carried over the PCH in a cell DRX cycle length = 2k frame PBP = 1 n = SFN DRX Cycle 0 4095 2K-1 PO PI 0 PI 1 …… PI i-1 PI i PI i+1 …… PI Np-1
  57. 57. DRX cycle length coefficient  When the UE is in the Idle mode, the RNC calculates K in the DRX period according to Kcs, Kps, and DRX Cycle Length Coefficient in the paging message from the CN.   For paging messages from the CS domain, K = Min(Kcs,Kps) For paging messages from the PS domain, if the CN adds DRX Cycle Length Coefficient to the paging message, K = Min (Kcs, Kps, DRX Cycle Length Coefficient).If the CN does not add DRX Cycle Length Coefficient to the paging message, K = Min(Kcs,Kps).
  58. 58. DRX cycle length coefficient  When the UE is in the PCH state, the RNC calculates K in the DRX period according to Kcs, Kps, KUtran, and DRX Cycle Length Coefficient in the paging message from the CN.   For paging messages from the CS domain, K = Min(Kcs,KUtran) For paging messages from the PS domain, if the CN adds DRX Cycle Length Coefficient to the paging message, K = Min (Kps, KUtran, DRX Cycle Length Coefficient). If the CN does not add DRX Cycle Length Coefficient to the paging message, K = Min(Kps,KUtran).
  59. 59. Called Signaling Flow System Information RRC Connection Setup NAS Connection RRC Connection Release
  60. 60. PAGING TYPE 2  When the UE is in the DCH or FACH state, the UTRAN initiates the paging process and sends a paging message of PAGING TYPE 2 over the DCCH channel. The UTRAN configures paging cause in the message. After the UE in the DCH or FACH state receives the message of PAGING TYPE 2, it starts the paging reception process and reports paging cause and paging record type identifier to the upper layer.
  61. 61. Paging Area CN UMTS URA_PCH Registration Cell Area Cell_DCH Cell_FACH Routing Area Idle mode Location Area Different paging area for UE in different RRC state
  62. 62. UTRAN DRX Cycle Length Coefficient Parameter Name KUtran Description This parameter is used for the discontinuous reception of UE in the connection mode. This parameter is used to calculate the paging occasion, that is, a constant required in monitoring the PICH cycle. The discontinuous reception cycle is 2k frames. Range and Step [ 3, 9] 6 Default Value View->Configuration Management->RNC NE->RNC Radio Resource Management->Advanced Parameter Manage ->RNC Radio Resource Management ->UTRAN DRX Cycle Length Coefficient
  63. 63. Sending Times of Paging Message Parameter Name PagingSendTimes Description The system has not obtained the information on the number of retransmitted paging message when receiving no response. If the value of this parameter increases, the possibility of paging success will increase. With the increase of the Uu interface messages, the Uu interface becomes more time consuming. Range and Step [ 1, 6] 3 Default Value View->Configuration Management->RNC NE->RNC Radio Resource Management->UtranCell->Advanced Parameter Manage ->UtranCell ->Sending Times of Paging Message
  64. 64. CS Domain DRX Cycle Length Coefficient Parameter Name Kcs Description The parameter allows a UE in the Idle or PCH state to calculate the paging occasion so that it can monitor the PICH channel at the time specified by the parameter. Range and Step [ 6, 9] 6 Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->Advanced Parameter Manage -> CN System Infomation ->CS Domain DRX Cycle Length Coefficient
  65. 65. PS Domain DRX Cycle Length Coefficient Parameter Name Kps Description The parameter allows a UE in the Idle or PCH state to calculate the paging occasion so that it can monitor the PICH channel at the time specified by the parameter. Range and Step [ 6, 9] 6 Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->Advanced Parameter Manage -> CN System Infomation ->PS Domain DRX Cycle Length Coefficient
  66. 66. Number of Paging Indicators per PICH Frame Parameter Name Np Description The larger the parameter, the higher the paging success rate, but the larger the transmit power of the PICH channel. Range and Step ( 18 , 36 , 72 , 144 ) 18 Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->UtranCell->Advanced Parameter Manage ->PICH ->Number of Paging Indicators per PICH Frame
  67. 67. PICH Power Parameter Name PichPwr Description This parameter indicates the PICH transmission power, which is an offset relative to the Primary CPICH power. Range and Step [ -10 , 5 ] dB step 1dB -7dB Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->Advanced Parameter Manage -> Power Control not Related to Service -> PICH Power
  68. 68. Content      UMTS System Information Broadcasting UMTS Paging UMTS Random Access UMTS RRC Connection Setup and Release Access Failed Case
  69. 69. PRACH Structure Preamble Preamble Preamble 4096 chips Preamble 4096 chips Message part 10 ms (one radio frame) Preamble Preamble Message part 20 ms (two radio frames)
  70. 70. Preamble Part  The preamble part of PRACH is 4096 chips long. It is obtained by repeating the 16-chip signature for 256 times and then processed with RPACH preamble scrambling.
  71. 71. Message Part Data Ndata bits Data Pilot Npilot bits Control TFCI NTFCI bits Tslot = 2560 chips, 10*2k bits (k=0..3) Slot #0 Slot #1 Slot #i Slot #14 Message part radio frame TRACH = 10 ms  k=0, 1, 2 and 3 corresponds respectively to the spectrum spreading factors adopted by the message part: SF=256, 128, 64 and 32.
  72. 72. Channelized code of PRACH message part  The spectrum spreading code used by the control part of PRACH is c c = Cch,256,m. where m = 16×s + 15.  The spectrum spreading code used by the data part of PRACH is c d =Cch,SF,m. where SF=256, 128, 64, 32 are the spectrum spreading factor of the data part, m = SF×s/16. s(0 ≤ s ≤ 15) is the serial number of the signature used by the PRACH preamble part among all 16 PRACH preamble signatures. Number of bits carried in PRACH message vs spectrum spreading factor:   Slot Format #i 0 1 2 3 Channel Bit Rate (kbps) 15 30 60 120 Channel Symbol Rate (ksps) 15 30 60 120 SF Bits/ Frame 256 150 128 300 64 600 32 1200 Bits/ Slot 10 20 40 80 Ndata 10 20 40 80
  73. 73. Random Access Process of Physical Layer       Select an available access slot Select a signature Set the preamble retransmission counter The UE calculates the initial transmit power of preamble If the UE fails to receive, in the DL access slot corresponding to the slot that sends the UL access preamble, the positive or negative response (AI = +1 nor –1) corresponding to the selected signature on AICH, Increase the transmit power of random access preamble by one PRStep. If the UE receives, in the DL access slot corresponding to the slot that sends the UL access preamble, the positive response corresponding to the selected signature on AICH, then the UE sends the message part of random access.
  74. 74. RACH access slot set    PRACH has totally 15 slots of 20ms and the slots belongs to two access slot sets. Access slot set 1 includes: slot 0~7 starting from τp-a chips before the DL P-CCPCH frame of SFN mod 2=0. Access slot set 2 includes: slot 8~14 starting from τp-a–2560 chips before the DL P-CCPCH frame of SFN mod 2=1. AICH access slots τp-a #0 PRACH access slots SFN mod 2 = 0 #0 #1 #2 #1 #3 #2 #4 #3 #5 Access slot set 1 10 ms #4 #6 SFN mod 2 = 1 #5 #7 #6 #8 #7 #9 #8 #9 #10 #11 #10 #11 #12 Access slot set 2 10 ms #13 #12 #14 #13 #14
  75. 75. RACH Sub-channel   RACH sub-channel defines a subset of all UL access slots. Mapping relation between available UL access slot and RACH sub-channel: SFN modulo 8 of corresponding 0 P-CCPCH frame 0 1 2 3 4 5 6 7 Sub-channel number 1 2 3 0 1 2 3 12 13 14 0 9 10 11 12 6 7 8 9 3 4 5 6 4 5 6 7 4 5 6 7 1 2 3 13 14 0 10 11 12 7 8 9 4 8 9 10 11 8 5 9 6 10 11 7 8 4 5 1 2 3 13 14 0 1 2 10 11 12 13 14
  76. 76. PRACH/AICH timing relation  The AICH frame is 20ms long and divided into 15 slots, each slot with 5120 chips. One access slot Acq. Ind. AICH access slots RX at UE τ p-a PRACH access slots TX at UE Preamble Preamble τ p-p Message part τ p-m
  77. 77. PRACH Preamble Scrambling Code Parameter Name PreamScraCode Description This parameter indicates the preamble scrambling number that this PRACH can use. The scrambling code that can be used for PRACH in each cell relates to the DL primary scrambling code of the cell. In addition, there are at most sixteen preamble scrambling codes available. This parameter can be used to distinguish the PRACHs. Range and Step [ 0 , 15 ] 0 Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->External UTRAN Cell-> External UTRAN Cell XXX-> Advanced Parameter Manager->PRACH> PRACH Preamble Scrambling Code
  78. 78. Available Signature Parameter Name Signature Description This parameter indicates all effective signatures when the PRACH is used. 16 bit represents 16 signatures; the bit which equals 1 means the corresponding signature is valid. Each signature corresponds one by one to the channelization code number of PRACH whose SF is 16. Range and Step Bit0: sig0 .. Bit15: sig15, Bit=1 means the corresponding signature is valid. Default Value Each bit is 1 Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->External UTRAN Cell-> External UTRAN Cell XXX-> Advanced Parameter Manager->PRACH> Available Signature
  79. 79. PRACH Available SF Parameter Name AvailableSF Description This parameter indicates the minimum effective spreading factor that this PRACH can use (limiting the maximum rate that the PRACH can transmit). The greater the minimum effective spreading factor is, the lower the maximum rate becomes at which the PRACH can transmit. Range and Step ( 32 , 64 , 128 , 256 ) 64 Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management-> UTRAN Cell-> Advanced Parameter Manager->PRACH-> PRACH Available SF
  80. 80. PRACH Preamble Power Ramp Step Parameter Name PRStep Description This parameter indicates the power ramp step used by the UE when it does not receive any responses from AICH after sending a preamble. This parameter is used to be added to the previous power, and then the next preamble is sent at this new power. Range and Step [ 1 , 8 ] dB step 1dB 1dB Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management-> UTRAN Cell-> Advanced Parameter Manager->PRACH-> PRACH Preamble Power Ramp Step(dB)
  81. 81. Maximum Number of Preamble Being Transmitted Parameter Name MaxPreamRetrans Description This parameter indicates the maximum number that the access preamble can be sent before L1 receives ACK or NACK. Range and Step [ 1 , 64 ] 40 Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management-> UTRAN Cell-> Advanced Parameter Manager->PRACH-> Maximum Number of Preamble Being Transmitted
  82. 82. Power Offset between PRACH Control Part and PRACH Data Part Parameter Name POPpm Description This parameter indicates the power offset between control part of the PRACH message part and the last preamble. It should be configured for each TFC. Range and Step [ -5,10 ] dB step 1dB 2 Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management-> Advanced Parameter Manager>Transmission Format Composition Set of PRACH-> Power Offset between PRACH Control Part and PRACH Data Part(dB)
  83. 83. PRACH Available SubChannel Number Parameter Name AvailSubChanNum Description This parameter indicates the available effective sub-channel number of this PRACH. The sub-channel number actually defines the available time slot for the PRACH. The bit indicates whether this sub-channel number is valid or not. Each sub-channel number can correspond to several access slots. For several PRACHs in the same cell, their sub-channel numbers must be different from each other. Range and Step bit0: subch0 .. bit11: subch11 Bit=1 means the corresponding sub channel is valid. Default Value Each bit is 1 Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management-> UTRAN Cell-> UTRAN Cell XXX-> Advanced Parameter Manager->PRACH-> PRACH Available SubChannel Number
  84. 84. Maximum Allowed UL TX Power of RACH Parameter Name MaxRACHTxPwr Description This parameter indicates the maximum allowed UL transmission power of RACH. If the parameter value is increased, the maximum allowed UL transmission power of RACH increases. If the parameter value is decreased, the maximum allowed UL transmission power of RACH decreases. Range and Step [ -50 , 33 ] dBm 24dBm Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management-> UTRAN Cell-> UTRAN Cell XXX-> Advanced Parameter Manager->PRACH-> Maximum Allowed UL TX Power of RACH(dBm)
  85. 85. Maximum Number of Preamble Ramping Cycles Parameter Name Mmax Description This parameter indicates the maximum times for re-sending attempts on MAC layer. When the physical layer returns NACK (unacknowledged) or NO ACK (Node B does not response), adds the attempt times, M, by 1. When M is over Mmax, the MAC layer stops the access process. When the parameter value is increased, the MAC layer makes more sending attempts. When the parameter value is decreased, the MAC layer makes less sending attempts. Range and Step [ 1 , 32 ] 6 Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management-> UTRAN Cell-> UTRAN Cell XXX-> Advanced Parameter Manager->PRACH-> Maximum Number of Preamble Ramping Cycles
  86. 86. Detected Preamble Threshold Parameter Name PreamThs Description This parameter indicates the preamble judgment threshold when Node B detects preambles. To make the access preamble of the PPRACH transmission be detected by Node B, the proportion of the received preamble power in the preamble cycle and the interference level should be larger than this parameter. Range and Step [ -36.0 , 0.0 ] dB step 0.5dB -24dB Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management-> UTRAN Cell-> UTRAN Cell XXX-> Advanced Parameter Manager->PRACH-> Detected Preamble Threshold(dB)
  87. 87. Content      UMTS System Information Broadcasting UMTS Paging UMTS Random Access UMTS RRC Connection Setup and Release Access Failed Case
  88. 88. RRC Connection Setup   A dedicated channel A common channel UE UTRAN RRC CONNECTION REQUEST RRC CONNECTION SETUP RRC CONNECTION SETUP COMPLETE
  89. 89. The signaling flow in signal trace tool
  90. 90. RRC Connection Setup RRC Connection Setup Request RNC
  91. 91. Establishing a RRC Connection over a Dedicated Transport channel  When receiving the RRC CONNECTION REQUEST message from a UE, the RNC specifies the channel over which the RRC connection is to be established according to the parameter InitRrcOnDch.   If the parameter InitRrcOnDch is set to 0 (Forced to DCH and Using Normal Speed Signaling) or 1 (Forced to DCH and Using 13.6Kbps signaling), or 5(Forced to DCH and using 27.2Kbps), the RNC establishes the RRC connection over the DCH channel. If the parameter InitRrcOnDch is set to 3 (Not Forced, Using 3.4Kbps Signaling on Cell-DCH State) or 4 (Not Forced, Using 13.6kbps Signaling on Cell-DCH State), or 6(Not Forced, Using 27.2Kbps Signaling on Cell-DCH State), the RNC selects to establish the RRC connection over the DCH according to the establishment cause in the RRC CONNECTION REQUEST message.
  92. 92. Establishing a RRC Connection over a Common Transport channel  When receiving the RRC CONNECTION REQUEST message from a UE, the RNC specifies the channel over which the RRC connection is to be established according to the parameter InitRrcOnDch.   If the parameter InitRrcOnDch is set to 2 (Forced to FACH), the RNC establishes the RRC connection over the FACH channel. If the parameter InitRrcOnDch is set to 3 , 4, or 6, the RNC establishes the RRC connection according to the establishment cause. If there is only a signaling process, instead of setting up services(for example, the value of establishment cause is registration ), RNC will select common channel to bear signaling.
  93. 93. Wireless Link Setup Failure  If the radio link setup fails, the RNC sends the RRC CONNECTION REJECT message to the UE and fills in Wait Time in the message. The parameter Wait Time specifies the duration (from the reception of the RRC CONNECTION REJECT message to the time of sending access request) during which the UE has to wait.
  94. 94. Failure to Receive RRC Connection Setup Response From UE  If RNC havn’t received RRC CONNECTION SETUP COMPLETE for waiting 5 seconds from the first transmitting of RRC CONNECTION SETUP, the RRC connection setup fails. The UE is still in idle mode.
  95. 95. Releasing the RRC Connection      The connection carrying services data or NAS signaling is released normally. The Node B detects radio link failure. The RNC monitors the RLC connection failure. The UE in the DCH or FACH state sends CELL UPDATE message. The value of AM_RLC error indication is true. The UE in the FACH state sends the CELL UPDATE message to the RNC. The cause is Radio link failure or RLC unrecoverable error. UE(DCH) RNC RRC Connection Release (SRB1) RRC Connection Release Complete UE(FACH) RNC RRC Connection Release (SRB2/CCCH) RRC Connection Release Complete (CCCH)
  96. 96. RRC connection release flow
  97. 97. Maximum Number of Retransmissions of the RRC CONNECTION RELEASE Message Parameter Name NReTran Description The parameter specifies the number of the RRC CONNECTION RELEASE messages retransmitted by the RNC after the UE does not return the RRC CONNECTION RELEASE COMPLETE message. If the value of this parameter decreases, the possibility of process failed will increase. Range and Step [ 1 , 10 ] 3 Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->Advanced Parameter Manage ->RNC Radio Resource Management ->Maximum Number of Retransmissions of the RRC CONNECTION RELEASE Message
  98. 98. Wait Time for RRC Connection Reestablishment Parameter Name Twait Description The smaller the parameter, it is easier to trigger access request flow, the larger the chance of second failure. Range and Step [ 0 , 15 ] s 5s Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->Advanced Parameter Manage ->RNC Radio Resource Management ->Wait Time for RRC Connection Reestablishment(s)
  99. 99. Number of FDD UMTS Frequency Range Parameter Name FDDFreqRngNum Description This parameter indicates the number of UTRAN FDD frequency range controlled by the local PLMN. When UE comes back to idle mode from RRC connected mode, UE selects one cell to reside. UTRAN contains this parameter in the message of RRC CONNECTION RELEASE, indicating the possible frequency range in UTRAN cells. This parameter helps UE to speed up the process of cell searching. Range and Step [ 0 , 32 ] 2 Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->RPLMN Range Information -> Number of FDD UMTS Frequency Range
  100. 100. Number of GSM BA Range Parameter Name GsmBARangeNum Description This parameter indicates the number of GSM BCCH distribution tables. When UTRAN network and BSS network belong to the same PLMN at the same time and UE has transferred from RRC connected mode to Idle mode, UE will selects one cell to reside. UTRAN contains this parameter in the message of RRC CONNECTION RELEASE, indicating the possible BCCH frequency range of neighboring GSM cells of the BSS network. This parameter helps UE to speed up the process of cell searching. Range and Step [ 0 , 32 ] 3 Default Value Configuration Path View->Configuration Management->RNC NE->RNC Radio Resource Management->RPLMN Range Information -> Number of GSM BA Range
  101. 101. GSM Lower Range Parameter Name Description Range and Step Default Value GsmLRange [ 32 ] This parameter indicates the frequency lower range of a specific GSM BCCH distribution table that the local PLMN controls. When UTRAN network and BSS network belong to the same PLMN at the same time and UE has transferred from RRC connected mode to Idle mode, UE will selects one cell to reside. UTRAN contains this parameter in the message of RRC CONNECTION RELEASE, indicating the possible BCCH frequency range of neighboring GSM cells of the BSS network. This parameter helps UE to speed up the process of cell searching. [0 , 1023] N/A View->Configuration Management->RNC NE->RNC Radio Resource Management->RPLMN Range Information ->GSM Lower Range
  102. 102. GSM Upper Range Parameter Name Description Range and Step Default Value GsmURange [ 32 ] This parameter indicates the frequency upper range of a specific GSM BCCH distribution table that the local PLMN controls. When UTRAN network and BSS network belong to the same PLMN at the same time and UE has transferred from RRC connected mode to Idle mode, UE will selects one cell to reside. UTRAN contains this parameter in the message of RRC CONNECTION RELEASE, indicating the possible BCCH frequency range of neighboring GSM cells of the BSS network. This parameter helps UE to speed up the process of cell searching. [0 , 1023] N/A View->Configuration Management->RNC NE->RNC Radio Resource Management->RPLMN Range Information ->GSM Upper Range
  103. 103. UARFCN (Nlow) Parameter Name Description Luarfcn [ 8 ] This parameter indicates the frequency lower range of a specific UTRAN FDD frequency that the local PLMN controls. When UE state is transferred from RRC connected mode to idle mode, UE selects one cell to reside. UTRAN contains this parameter in the message of RRC CONNECTION RELEASE, indicating the possible transmission frequency range of the UTRAN cells. This parameter helps UE to speed up the process of cell searching. Range and Step Band I: [10562, 10838] Band II: [9662, 9938] Default Value N/A View->Configuration Management->RNC NE->RNC Radio Resource Management->RPLMN Range Information ->UARFCN (Nlow)
  104. 104. UARFCN(Nupper) Parameter Name Description Uuarfcn [ 8 ] This parameter indicates the frequency upper range of a specific UTRAN FDD that the local PLMN controls. When UE state is transferred from RRC connected mode to idle mode, UE selects one cell to reside. UTRAN contains this parameter in the message of RRC CONNECTION RELEASE, indicating the possible transmission frequency range of the UTRAN cells. This parameter helps UE to speed up the process of cell searching. Range and Step Band I: [10562, 10838] Band II: [9662, 9938] Default Value N/A View->Configuration Management->RNC NE->RNC Radio Resource Management->RPLMN Range Information ->UARFCN(Nupper)
  105. 105. Type of Transport Channel for Initial RRC Connection Setup Parameter Name InitRrcOnDch Description This parameter indicates the type of transport channel and signaling rate for initial RRC connection setup. Range and Step 0:forcedly establish the RRC connection over the DCH channel and use the common signaling 1: Forcedly establish the RRC connection over the DCH channel and use the high speed signaling 2: Forcedly establish the RRC connection over the FACH channel and use the high speed signaling 3:Establish the RRC connection over the DCH channel in a non-forced manner and use the common signaling 4: Establish the RRC connection over the DCH channel in a non-forced manner and use the high speed signaling. Default Value 1 View->Configuration Management->RNC NE->RNC Radio Resource Management->Basic Infomation ->Type of Transport Channel for Initial RRC Connection Setup
  106. 106. Content      UMTS System Information Broadcasting UMTS Paging UMTS Random Access UMTS RRC Connection Setup and Release Access Failed Case
  107. 107. Description  Customer complained that it was difficult to access the network in office, and it was too long to wait.
  108. 108. Analysis   The drive test shows that the receiving level of UE is normal. Besides, there is no alarm related to hardware. The Performance Management System(PMS) software of NodeB shows the statistics of accessing. A large amount of rejection of access is found, which occupied the demodulation resource, causing the long time to wait for a call connection.
  109. 109. Analysis  Preamble_Initial_Power = Primary CPICH DL TX power – CPICH_RSCP + UL interference + Constant Value  “Primary CPICH DL TX power – CPICH_RSCP” is the Pathloss of downlink. UE UTRAN CPICH Preamble ………………..Preamble AICH Message of PRACH
  110. 110. Analysis  Use the signaling trace tools of OMCR, RNC didn’t receive the “RRC Connection Request” message. Use the BMC TRACE, find “Rach CRC Error”.So, we make a conclusion that the Preamble Threshold is too big which result in the message transmit power is very low, and NodeB cannot receive the message.
  111. 111. Solution  Solution    Change the Preamble Threshold:-24dB-21dB Constant Value:-21dB-18dB Result  Test again, make a call 120 times, all the calls are successful.
  112. 112. Access Failed Case -21dB -21 -18dB

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