Enhancement on radio link failure report to record necessary timing details for a dual-threshold handover trigger event

A mobile device for reporting an occurrence of a Radio Link Failure (RLF) associated with a handover (HO) of the mobile device by a source node to a target node, wherein the source node serves the mobile device in a cellular network, and wherein the mobile device comprises:

• a transceiver for wirelessly communicating with the source node in the cellular network;
• a memory for storing program instructions;
• and
• a processor coupled to the memory and the transceiver and configured to execute the program instructions, whereby the mobile device is operative to:
• store the following in the memory for each event-specific entering condition associated with a Measurement Report-triggering event related to the HO:
• a respective timing indication for only a most recent fulfillment of each corresponding event-specific entering condition,
• further store, in the memory, a failure time-stamp for the occurrence of the RLF,
• wherein each of the respective timing indication and the failure time-stamp is based on a reference time recognized by the source node, and
• send RLF-reporting information to the target node, wherein the RLF-reporting information contains each stored timing indication and the stored failure time-stamp.

A network entity in a cellular network for performing a handover (HO) of a mobile device to a target entity, wherein a Radio Link Failure (RLF) is associated with the HO and wherein the network entity was serving the mobile device immediately prior to the RLF, wherein the network entity comprises:

• a transceiver for wirelessly communicating with the mobile device;
• a memory for storing program instructions;
• and
• a processor coupled to the memory and the transceiver and configured to execute the program instructions, whereby the network entity is operative to:
• receive RLF-reporting information from the target entity, wherein the RLF-reporting information contains the following:
• a respective triggering time-stamp for only a most recent fulfillment of each corresponding event-specific entering condition associated with a Measurement Report-triggering event related to the HO, and
• a failure time-stamp for the occurrence of the RLF,
• wherein each of the triggering and the failure time-stamps is based on a reference time recognized by the network entity, and
• process the received RLF-reporting information.