Method and apparatus for changing coverage enhancement/repetition level used for radio link monitoring in wireless communication system
AssigneeLG Electronics Inc.
InventorsYunjung Yi, Hanbyul Seo
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Abstract
A method and apparatus for performing radio link monitoring (RLM) in a wireless communication system is provided. A user equipment (UE), which requires coverage enhancement (CE), configures a repetition level for RLM, and performs RLM measurement based on the configured repetition level. The configured repetition level may correspond to a maximum repetition level configured per each UE or per each CE mode. Or, the configured repetition level may correspond to a maximum repetition level supported by a network.
Claims15
A method for performing, by a user equipment (UE), a radio link monitoring (RLM) in a wireless communication system, the method comprising:
- configuring a repetition level for the RLM;
- performing a first RLM measurement based on the configured repetition level;
- detecting a radio link failure (RLF) by the first RLM measurement based on the configured repetition level;
- based on that the configured repetition level is smaller than a maximum repetition level, configuring the maximum repetition level, which is supported by a network, as the repetition level for the RLM, after the RLF is detected;
- performing a second RLM measurement based on the maximum repetition level;
- determining that a network is in range that a scheduling of user traffic to the UE is possible based on that in-sync is detected based on the second RLM measurement, which has been performed based on the maximum repetition level;
- and
- starting a random access procedure to reconfigure the repetition level for the RLM, based on that the network is determined to be in the range,
- wherein the UE requires coverage enhancement,
- wherein the repetition level is related to a repetition of a physical downlink control channel (PDCCH) or an enhanced PDCCH (EPDCCH), and
- wherein for each repetition level, a different frequency location is used for the PDCCH or the EPDCCH.
A user equipment (UE) for performing a radio link monitoring (RLM) in a wireless communication system, the UE comprising:
- a memory;
- a transceiver;
- and
- a processor connected with the memory and the transceiver, wherein the processor is configured to:
- configure a repetition level for the RLM;
- perform a first RLM measurement based on the configured repetition level;
- detect a radio link failure (RLF) by the first RLM measurement based on the configured repetition level;
- based on that the configured repetition level is smaller than a maximum repetition level, configure the maximum repetition level, which is supported by a network, as the repetition level for the RLM, after the RLF is detected;
- perform a second RLM measurement based on the maximum repetition level;
- determine that a network is in range that a scheduling of user traffic to the UE is possible based on that in-sync is detected based on the second RLM measurement, which has been performed based on the maximum repetition level;
- and
- start a random access procedure to reconfigure the repetition level for the RLM, based on that the network is determined to be in the range,
- wherein the UE requires coverage enhancement,
- wherein the repetition level is related to a repetition of a physical downlink control channel (PDCCH) or an enhanced PDCCH (EPDCCH), and
- wherein for each repetition level, a different frequency location is used for the PDCCH or the EPDCCH.
Dependencies are inferred from the claim text.