LTE Access Fault DiagnosisConfidential Information of Huawei. No Spreading Without Permission LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission . LTE Access Fault Diagnosis After UE select a suitable cell. No Spreading Without Permission . only for some Smart UE that support VoIP) Above figure shows the detailed procedure Confidential Information of Huawei. including the following procedures: Random access RRC connection setup (RRC cause: MO signaling) NAS authentication procedure E-RAB setup (Activate default EPS bearer) Setup dedicated bearer (Optional. it initials attach flow. LTE Access Fault Diagnosis If UE request service again while in idle status. it initials “Service Request” procedure The whole procedure are very similar as initial attach procedure except: The cause of RRC connection is “MO Data” No authentication and UE capability query procedure as UE context already exists in MME Confidential Information of Huawei. No Spreading Without Permission . No Spreading Without Permission . The scenarios of TAU can be: UE initial attach UE move to a new TA area Periodic TA update Confidential Information of Huawei. ensure that UE location is known by MME.LTE Access Fault Diagnosis TAU procedure is a UE idle behavior. No Spreading Without Permission .LTE Access Fault Diagnosis Confidential Information of Huawei. LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission . 3 km 14 . and LTE TDD supports preamble formats 0-4.5 km < R ≤ 77.3km < R ≤ 100 km Not involved.1 µs 14.5km 1.58 µs 133.600 684.3km < R ≤ 100 km 77 . and the cell radius can be set through the CellRadius parameter.4 km Confidential Information of Huawei. LTE FDD supports preamble formats 0-3.4 km < R ≤ 14.3 km 29 . Format 4 is a special RACH preamble for LTE-TDD only.5 km 14.5 km 77 .5km < R ≤ 77.33 µs FDD Cell Radius (R) TDD Cell Radius (R) R ≤ 14.600 µs 1.5 km < R ≤ 29.5km < R ≤ 29. R ≤ 1.4 µs 800 µs 1.9 µs TSEQ 103. which are used for cells of different radii.1 µs 800 µs 684. No Spreading Without Permission .LTE Access Fault Diagnosis There are five RA preamble formats.5 km 29. Preamble Length TCP Format 0 1 1ms 2ms 2 2ms 3 3ms 4 167. The preamble format can be set through the PreambleFmt parameter.4 µs µs 203. LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission . The response contains RA-Preamble Identifier. if the number of random access attempts is smaller than the maximum. the response fails. For the UE . and Temporary C-RNTI. random access fails. If the received RA-Preamble Identifier is consistent with the identifier that the UE previously sent. This conflict will be handled in contention resolution procedure. the UE attempts random access again. A message on the DL-SCH can carry multiple RA responses to be transmitted to multiple use.LTE Access Fault Diagnosis Upon receiving the UE preamble. the UE infers that the response is successful. Otherwise. Then. If multiple-UE send the preamble with the same RA-RNTI. Otherwise. then eNodeB detects that the conflict occurs. No Spreading Without Permission . the UE transmits uplink scheduled data. Initial UL Grant. The UE monitors the Physical Dedicated Control Channel (PDCCH) in the Transmission Time Interval (TTI) until it obtains the required RA response. Confidential Information of Huawei. In this case. the eNodeB transmits an RA response over DL-SCH. Timing Alignment Information. then use S-TMIS as UE ID If UE initial attach. This message is scrambled by temporary C-RNTI. UE generate a random number according to its IMSI as UE ID In the other case. the message could be RRC connection request RRC reestablishment request RRC reconfiguration complete (Handover confirmation) Other user data In case of “RRC connection request” message. No Spreading Without Permission . UE will carry its unique ID for contention resolution if random access conflict. Based on different random access scenarios. UE at least send its C-RNTI to identify the different UE Confidential Information of Huawei.the UE transmits uplink scheduled data over the UL-SCH. UE sends its UE ID to identify the different UE. This UE ID could be: If UE already get S-TMIS from MME. In this message.LTE Access Fault Diagnosis With the grant . Then. If the contention resolution timer expires.the contention resolution timer starts. the UE infers that the contention resolution is successful and it notifies the upper layer and stops the : The UE obtains the C-RNTI when monitoring the PDCCH. the MAC Packet Data Unit (MAC PDU) is successfully decoded. In addition. the UE infers that the contention resolution fails. In the following situations. Confidential Information of Huawei. the UE performs RA again if the number of RA attempts is smaller than the maximum number of attempts. No Spreading Without Permission . Temporary C-RNTI is obtained when the UE monitors the PDCCH.LTE Access Fault Diagnosis After the UE sends message 3. The UE monitors the PDCCH before the timer expires. RRC.ConnReq.RRC.LTE Access Fault Diagnosis Purpose of RRC connection Setup SRB1 Send NAS message to EPC Relevant counters: A: RRC connection attempts (L. No Spreading Without Permission .Att) B: RRC connection setup successful (L.ConnReq.Succ) Confidential Information of Huawei. No Spreading Without Permission .LTE Access Fault Diagnosis Confidential Information of Huawei. to setup dedicated S1 control plane for UE. the default PDN connectivity and EPS bearer will also be setup.LTE Access Fault Diagnosis After UE succeed attach to MME. At the same time. MME initial the ERAB setup procedure.InitSuccEst) Confidential Information of Huawei. After ERAB setup.E-RAB. there is already IP connectivity between UE and gateway which is called “Always on line” function.InitAttEst) B: ERAB setup successful (L.E-RAB. Relevant counters: A: ERAB setup attempts (L. No Spreading Without Permission . LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission . No Spreading Without Permission .LTE Access Fault Diagnosis Confidential Information of Huawei. LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission . No Spreading Without Permission .LTE Access Fault Diagnosis Trace of UE capability Confidential Information of Huawei. LTE Access Fault Diagnosis After SRB2 setup. No Spreading Without Permission . all the NAS message on UU interface in carried by SRB2 with the message RRC_DL_INFO_TRANSF or RRC_UL_INFO_TRANSF Confidential Information of Huawei. No Spreading Without Permission .LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission .LTE Access Fault Diagnosis Confidential Information of Huawei. NAS can be combined in common S1AP message as NAS PDU or directly transferred as “S1AP_DL/UL_NAS_TRANS” message Confidential Information of Huawei.LTE Access Fault Diagnosis NAS procedure is coming after RRC complete. No Spreading Without Permission . including Attach request (default) Default EPS bearer activity (default) Dedicate EPS bearer setup (optional) Authentication (optional) Identification (optional) NAS procedure is associated with ERAB setup procedure. on S1 interface. on UU interface NAS can be combined in common RRC message as NAS PDU or directly transferred as “RRC_DL/UL_INFO_TRANSF” message. for NAS delivery. LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission . No Spreading Without Permission .LTE Access Fault Diagnosis Confidential Information of Huawei. LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission . LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission . LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission . LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission . LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission . LTE Access Fault Diagnosis The barred cell only impacts on initial UE access. No Spreading Without Permission . handover in is not affected. Confidential Information of Huawei. LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission . LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission . LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission . No Spreading Without Permission .LTE Access Fault Diagnosis Confidential Information of Huawei. LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission . LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission . LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission . No Spreading Without Permission .LTE Access Fault Diagnosis Confidential Information of Huawei. LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission . No Spreading Without Permission .LTE Access Fault Diagnosis Confidential Information of Huawei. LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission . No Spreading Without Permission .LTE Access Fault Diagnosis Confidential Information of Huawei. Confidential Information of Huawei. No Spreading Without Permission .LTE Access Fault Diagnosis This failure is caused by eNodeB admission failure. If PUCCH or SRS resource is limited. eNodeB should stop admit all services including RRC. LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission . Rej Number of RRC Connection Reject messages sent to the UE in a cell Confidential Information of Huawei.SetupFail.SetupFail.SetupFail.NoReply Number of RRC connection setup failures due to no responses from the UE L.RRC.LTE Access Fault Diagnosis Relevant RRC failure counter: Counter name Description L.RRC.ResFail Number of RRC connection setup failures due to resource allocation failures L. No Spreading Without Permission .RRC. No Spreading Without Permission .LTE Access Fault Diagnosis This NAS procedure refers to the procedure between UE initial message and Initial UE context setup response message. identification. If NAS procedure is failure. including attach. then MME will send a UE context release command. authentication. and the release cause is NAS. PLMN 2. so eNodeB will consider this release is normal release and doesn’t count it in performance static. Possible scenarios: Authentication failure: Incorrect subscriptions user data in HSS Solution: Check subscription data in HSS Attach failure: Parameters between UE and EPC is not identical Solution: Check the if the following parameters are identical with EPC 1. TAC PDN activity failure: Wrong configuration of APN in UE or EPC Confidential Information of Huawei. default bearer activity. LTE Access Fault Diagnosis This failure refers the fault between “Initial context setup request” message and “Initial context setup response” message. Confidential Information of Huawei. then ERAB setup procedure fails. No Spreading Without Permission . If any step occur fault. No Spreading Without Permission .LTE Access Fault Diagnosis Confidential Information of Huawei. E-RAB.FailEst. UE internal process error Confidential Information of Huawei. No Spreading Without Permission .NoReply counter is incremented each time the eNodeB receives no responses from the UE before the corresponding timer expires after sending an RRC signaling message to the UE during the initial UE context setup procedure or the ERAB setup procedure Possible cause: Poor DL/UL coverage which cause message missing.LTE Access Fault Diagnosis Scneario: the L. No Spreading Without Permission .LTE Access Fault Diagnosis Confidential Information of Huawei. LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission . No Spreading Without Permission .LTE Access Fault Diagnosis Confidential Information of Huawei. LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission . LTE Access Fault Diagnosis Tracing message Confidential Information of Huawei. No Spreading Without Permission . LTE Access Fault Diagnosis Message tracing Confidential Information of Huawei. No Spreading Without Permission . No Spreading Without Permission .LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission .LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission .LTE Access Fault Diagnosis Confidential Information of Huawei. LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission . No Spreading Without Permission .LTE Access Fault Diagnosis Confidential Information of Huawei. LTE Access Fault Diagnosis Cautioned Words 1 Tracing ( Signaling/ Message/Interface etc) The privacy-related information may be anonymity for user's privacy protection. No Spreading Without Permission . Confidential Information of Huawei. LTE Access Fault Diagnosis Confidential Information of Huawei. No Spreading Without Permission .