System and method for managing UE-based network performance measurements
A method and apparatus for managing UE-based network performance measurements utilizing a process of tracing a UE in a radio telecommunication network. An eNB may receive a trace activation message from a Mobility Management Entity, MME, or a Network Management Entity, wherein the trace activation message includes eNB-specific, and optionally MME-specific, selection conditions for selecting a UE for a trace session. The eNB selects a UE for tracing when the eNB-specific selection conditions are satisfied, and may send the MME-specific selection conditions to the MME for evaluation. When all selection conditions are satisfied, the eNB activates the trace session with the selected UE. The Trace Activation IE utilized in the Trace Start message, the UE Context Setup Request message, and the Handover Request message is extended with additional IEs in order to implement the method.
1. A method of managing User Equipment, UE-based network performance measurements utilizing a process of tracing a UE in a radio telecommunication network, the method comprising the steps of:
receiving at an eNodeB, eNB, trace control and configuration parameters from a network management entity, wherein the parameters are configured by a network operator to include only eNB-specific selection conditions including identified cells and device capabilities of UEs, whereby the network operator targets UEs with the identified device capabilities and located in a geographical area corresponding to the identified cells for performance measurement collection;
selecting by the eNB, UEs for tracing based on the eNB-specific selection conditions;
initiating a trace by the eNB toward a given UE of one of the selected UEs; and
notifying the one of the network management entity and the mobility management entity that the trace has been initiated for the given UE.
2. The method according to claim 1 , wherein when the given UE changes cells, the eNB deactivates an immediate Minimization of Drive Test, MDT, trace recording session for the given UE by sending a Radio Resource Control, RRC, measurement reconfiguration message to the given UE.
3. The method according to claim 1 , further comprising the steps of:
receiving by the eNB, measurement reports from the given UE; and
sending the measurement reports in a trace record from the eNB to a Trace Collection Entity, TCE.
4. The method according to claim 1 , further comprising, for a logged trace session, the steps of:
storing logged performance measurements by the given UE when a logging duration expires; and
indicating by the given UE to the telecommunication network, that logged performance measurements are available when the given UE reenters a connected mode.
5. The method according to claim 1 , further comprising the steps of:
receiving by the eNB, a message from an Element Manager to deactivate a trace session for identified cells; and
deactivating the trace session by the eNB for the identified cells in the message;
wherein when the trace session is an immediate Minimization of Drive Test, MDT, trace session, the eNB deactivates corresponding MDT Radio Resource Control, RRC, measurements in UEs that have been configured for the immediate MDT trace session as part of the trace session.
6. The method according to claim 1 , wherein the step of initiating a trace by the eNB toward the given UE of one of the selected UEs includes:
initiating a trace recording session in the eNB for each selected UE that satisfies the eNB-specific selection conditions, provided that an Element Manager has previously activated a trace session in the eNB for identified cells; and
configuring by the eNB, corresponding Radio Resource Control, RRC, measurements at the selected UEs.