Failure of the normal processes and procedures for comparison, to see what missing signaling.
After authentication, E-RAB is established.
2 is a preamble signaling, indicators signaling unseen physical layer
signaling is RRC request 3,4 and number of successful
authentication and encryption: the request and the number of successful
E-RAB: the request and the number of successful
radio access through the definition of indicators came out.
TOP cell sorting to identify the RRC, authentication and E-RAB corresponding to several cells or to see the whole network.
TOP cell: Ideally get data for all terminals in a cell. Signaling to one or two arbitrarily selected track. Tracking not see the problem needs to be done to verify the parameters
(parameters compared to other normal cells), the signaling is lost if the uplink, uplink signal quality suspect there is a problem (most upstream does not receive the uplink coverage is a problem). The corresponding base station does not respond to signaling, there may be several users full specification limits (for example only user network 200), the base station to load more than 90%. Signaling the base station replies, the terminal does not receive the downlink coverage problems, it appeared abnormal terminal or unresolved. UE made, the base station also return to normal, normal UE also shows, the base station records RRC fails, suspect a problem with the timer settings. Signaling such as from 3 to 4, provided 50ms, is recorded over failure. But you are 60ms finished the entire signaling.
Authentication and encryption, E-RAB above, are similar problems.
The last problem is the abnormal cell: hanging dead, there is a problem of radio resources. Abnormalities of exaggeration, such as connection rate of 5%.
Authentication is very easy to solve, such as the core network encryption server fails, the entire network will be useless to repair a problem, or terminal arrears reasons. The establishment of E-RAB most cases is 100%, there is no problem. RRC focuses on top issues.
RRC connection establishment failure is the most common.
Uplink RACH problem: o a preamble region configured like a collision.
TAU procedure paging failure: from station A to station B, station B would give initiates a random access preamble code. Paging unreasonable, or in that the user station A, and finally transmits a preamble to the station A, the distances from A station, the random access is certainly failed.
Unreasonable cell reselection parameters: A to B after switching off the network to re-network, and network to select a good cell B, but the network is still selected cell A, the UE fails to initiate an access on the best cell.