Method of mdt information logging and reporting

Abstract

A method of MDT information logging and problem event reporting is provided. The method supports provisioning of reference events to enable correlation of system time and the problem occurrence. In one embodiment, a problem event report includes time information directly or indirectly related to a reference event. A method of handling battery condition is also provided. The method supports autonomously suspending or resuming OAM activities in MDT based on predefined battery condition. In one embodiment, a testable battery condition handling is designed for MDT logging.

What is claimed is: 
     
         1 . A method, comprising:
 detecting, by a user equipment (UE), a reference event in a wireless network, the reference event being known to the UE and a network device;   detecting a problem event by the UE;   determining, by the UE, relative time information corresponding to a duration between occurrence of the reference event and occurrence of the problem event; and   logging, by the UE, the problem event in association with the relative time information; and   sending, by the UE to the network device, a problem event report to report the logged problem event and the logged relative time information,   wherein the problem event report further includes a delay-indicator that is added in response to a delay of sending the problem event report.   
     
     
         2 . The method of  claim 1 , wherein the problem event includes a radio link failure (RLF), a handover (HO) failure, a random access channel (RACH) failure, an initial connection setup failure, a cell reselection failure, or a UE entering an out-of-service state. 
     
     
         3 . The method of  claim 1 , wherein the reference event includes a successful camping of the UE to a base station before the problem event occurred, or the UE being served by a different radio access technology (RAT) or by a different public land mobile network (PLMN). 
     
     
         4 . The method of  claim 1 , wherein the problem report is a Minimization of Driver Tests (MDT) Report. 
     
     
         5 . A method, comprising:
 detecting, by a user equipment (UE), a reference event in a wireless network, the reference event being known to the UE and a network device;   detecting a Minimization of Driver Tests (MDT) event by the UE;   determining, by the UE, relative time information corresponding to a duration between occurrence of the reference event and occurrence of the MDT event;   logging, by the UE, a piece of record recording the MDT event and the relative time information;   determining whether to discard the piece of record at a time more than a predetermined time threshold after the occurrence of the MDT event; and   sending, by the UE to the network device in response to a request from the network device, a MDT event report to report the MDT event according to the piece of record in a case that the piece of record is not discarded prior to the sending the MDT event report.   
     
     
         6 . The method of  claim 5 , further comprising:
 receiving, by the UE from the network device, a MDT configuration message; and   starting the detecting the MDT event in response to the MDT configuration message.   
     
     
         7 . The method of  claim 5 , wherein the MDT event report further includes a delay-indicator that is added to indicate whether the sending the MDT event report is delayed. 
     
     
         8 . The method of  claim 5 , wherein the reference event includes a successful camping of the UE to a base station before the problem event occurred, or the UE being served by a different radio access technology (RAT) or by a different public land mobile network (PLMN). 
     
     
         9 . The method of  claim 5 , wherein the problem event includes a radio link failure (RLF), a handover (HO) failure, a random access channel (RACH) failure, an initial connection setup failure, a cell reselection failure, or a UE entering an out-of-service state. 
     
     
         10 . A user equipment (UE), comprising:
 processing circuitry configured to:
 detect a reference event in a wireless network, the reference event being known to the UE and a network device; 
 detect a problem event by the UE; 
 determine relative time information corresponding to a duration between an occurrence of the reference event and an occurrence of the problem event; and 
 log the problem event in association with the relative time information; and 
 send, to the network device, a problem event report to report the logged problem event and the logged relative time information, 
   wherein the problem event report further includes a delay-indicator that is added in response to a delay of sending the problem event report.   
     
     
         11 . The UE of  claim 10 , wherein the problem event includes a radio link failure (RLF), a handover (HO) failure, a random access channel (RACH) failure, an initial connection setup failure, a cell reselection failure, or a UE entering an out-of-service state. 
     
     
         12 . The UE of  claim 10 , wherein the reference event includes a successful camping of the UE to a base station before the problem event occurred, or the UE being served by a different radio access technology (RAT) or by a different public land mobile network (PLMN). 
     
     
         13 . The UE of  claim 10 , wherein the problem report is a Minimization of Driver Tests (MDT) Report.