Methods and wireless communication device for carrying out beam failure recovery
AssigneeZte Corporation
InventorsXiaojuan Shi, Eswar Kalyan Vutukuri
Life of this patent
Estimating the term…
Abstract
Methods and a wireless communication device for carrying out beam failure recovery include, according to various implementations, using a beam failure recovery request media access control-control element (BFRR MAC CE) to transfer beam failure recovery information (e.g., from one node of a wireless network to another—such as from a mobile wireless communication device to a base station (BS)). The BFRR MAC CE may include one or more of: the reference signal (RS) type (i.e., the type of RS resource), the identity of the RS resource, the identity of a frequency location (e.g., the identity of a bandwidth part in cases where bandwidth part (BWP) is used), and the identity of the serving cell.
Claims15
A method for a wireless communication device for recovering from beam failure, the method comprising:
- in response to detecting a beam failure on a primary cell, identifying a candidate beam for recovering a radio link between the wireless communication device and a network node;
- transmitting an identity of the candidate beam in a media access control protocol control element to the network node;
- signaling the media access control protocol control element on uplink resources that are allocated for new transmission by the network node in a random access response, wherein the random access response is in a contention-based random access procedure;
- monitoring the candidate beam for a response by monitoring a physical downlink control channel (PDCCH) addressed to a Cell Radio Network Temporary Identifier (C-RNTI) of the wireless communication device;
- including, in the media access control protocol control element, an identity of a bandwidth Part (BWP) on which the beam failure occurred and an identity of a serving cell on which the beam failure occurred;
- and
- declaring a radio link failure if the recovering from beam failure on the primary cell fails.
A wireless communication device comprising a processor, the processor being configured to:
- in response to detecting a beam failure on a primary cell, identify a candidate beam for recovering a radio link between the wireless communication device and a network node;
- transmit an identity of the candidate beam in a media access control protocol control element to the network node;
- signal the media access control protocol control element on uplink resources that are allocated for new transmission by the network node in a random access response, wherein the random access response is in a contention-based random access procedure;
- monitor the candidate beam for a response by monitoring a physical downlink control channel (PDCCH) addressed to a Cell Radio Network Temporary Identifier (C-RNTI) of the wireless communication device;
- include, in the media access control protocol control element, an identity of a bandwidth Part (BWP) on which the beam failure occurred and an identity of a serving cell on which the beam failure occurred;
- and
- declare a radio link failure if the recovering from beam failure on the primary cell fails.
A non-transitory computer-readable medium having stored thereon computer-executable instructions for causing a computer to:
- in response to detecting a beam failure on a primary cell, identify a candidate beam for recovering a radio link between the wireless communication device and a network node;
- transmit an identity of the candidate beam in a media access control protocol control element to the network node;
- signal the media access control protocol control element on uplink resources that are allocated for new transmission by the network node in a random access response, wherein the random access response is in a contention-based random access procedure;
- monitor the candidate beam for a response by monitoring a physical downlink control channel (PDCCH) addressed to a Cell Radio Network Temporary Identifier (C-RNTI) of the wireless communication device;
- include, in the media access control protocol control element, an identity of a bandwidth Part (BWP) on which the beam failure occurred and an identity of a serving cell on which the beam failure occurred;
- and
- declare a radio link failure if the recovering from beam failure on the primary cell fails.
Dependencies are inferred from the claim text.