# US 12,113,742 B2 · Beam failure recovery method and device, beam failure recovery parameter determination method and device, quasi colocation reference signal determination method and device, and storage medium

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- Number: US 12,113,742 B2
- Document ID: US12113742B2
- Status: Granted
- Kind: B2
- Application number: 17/598,784
- Filed: 2020-03-30
- Published: 2022-05-26
- Granted: 2024-10-08
- Earliest claimed: 2019-03-28
- Assignees: Zte Corporation
- Applicants: Zte Corporation
- Inventors: Shujuan Zhang; Zhaohua Lu; Xiyu Wang; Bo Gao; Yijian Chen; Yu Ngok Li; Chuangxin Jiang
- Web page: https://patentgrep.com/patent/US12113742B2

## CPC

- H04B 7/06964: {Re-selection of one or more beams after beam failure}
- H04L 5/0023: {Time-frequency-space}
- H04L 5/0032: {Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation}
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A method for beam failure recovery includes performing, in response to a non-empty intersection existing among time domain resources corresponding to beam failure recovery processes of N frequency domain bandwidths, any one of the following methods: selecting the beam failure recovery process of one frequency domain bandwidth among the beam failure recovery processes of the N frequency domain bandwidths, performing the beam failure recovery process of the selected frequency domain bandwidth, and terminating or suspending beam failure recovery processes of the unselected frequency domain bandwidths; combining the beam failure recovery processes of the N frequency domain bandwidths into a single beam failure recovery process and performing the single beam failure recovery process; or performing the beam failure recovery processes of the N frequency domain bandwidths simultaneously. Here N is a positive integer greater than 1.

## Claims

### Claim 1

A method for beam failure recovery, comprising: in response to a non-empty intersection existing between time domain resources corresponding to beam failure recovery processes of N frequency domain bandwidths,
combining the beam failure recovery processes of the N frequency domain bandwidths into a single beam failure recovery process and performing the single beam failure recovery process;
wherein N is an integer greater than 1 and a time domain resource corresponding to a beam failure recovery process of a frequency domain bandwidth of the N frequency domain bandwidths comprises a period from detecting a beam failure event to monitoring beam failure response information;
wherein combining the beam failure recovery processes of the N frequency domain bandwidths into the single beam failure recovery process and performing the single beam failure recovery process comprises: in response to requiring transmission of first information corresponding to one frequency domain bandwidth, determining a first frequency domain bandwidth set, and transmitting first information corresponding to the first frequency domain bandwidth set;
wherein a beam failure event occurs and has not been recovered successfully for each frequency domain bandwidth in the first frequency domain bandwidth set;
wherein the first information corresponding to the first frequency domain bandwidth set comprises first information corresponding to each frequency domain bandwidth in the first frequency domain bandwidth set; and
wherein the first information corresponding to the each frequency domain bandwidth in the first frequency domain bandwidth set comprises an index of a component carrier (CC) or an index of a CC and indication information of a new reference signal selected from a candidate reference signal set corresponding to the each frequency domain bandwidth.

### Claim 2 (depends on 1)

The method according to claim 1, wherein combining the beam failure recovery processes of the N frequency domain bandwidths into the single beam failure recovery process and performing the single beam failure recovery process further comprises at least one of:
selecting one beam failure request resource based on the first frequency domain bandwidth set, and transmitting the first information corresponding to the first frequency domain bandwidth set on the one beam failure request resource;
the first frequency domain bandwidth set comprises M frequency domain bandwidths selected from a second frequency domain bandwidth set, a beam failure event occurs and has not been recovered successfully for each frequency domain bandwidth in the second frequency domain bandwidth set, and M is an integer greater than or equal to 1 and smaller than or equal to N; or
in response to receiving response information corresponding to one frequency domain bandwidth set, determining that a beam failure recovery process corresponding to the one frequency domain bandwidth set is successfully completed.

### Claim 3 (depends on 2)

The method according to claim 2, satisfying at least one of the following characteristics:
transmitting the first information corresponding to the first frequency domain bandwidth set on the one beam failure request resource comprises: transmitting an information bit representing the first information corresponding to the first frequency domain bandwidth set on the one beam failure request resource;
selecting the M frequency domain bandwidths from the second frequency domain bandwidth set comprises selecting the M frequency domain bandwidths from the second frequency domain bandwidth set based on second information, wherein the second information comprises information about whether the second frequency domain bandwidth set comprises a special cell (SPcell).

### Claim 4 (depends on 3)

The method according to claim 3, wherein selecting the M frequency domain bandwidths from the second frequency domain bandwidth set comprises:
in response to a beam failure event occurring in a primary cell (Pcell) and a beam failure event occurring in a secondary cell (Scell), selecting a beam failure recovery process of the Pcell;
wherein one cell corresponds to one frequency domain bandwidth.

### Claim 5 (depends on 1)

The method according to claim 1, wherein a frequency domain bandwidth of the N frequency domain bandwidth whose first information has been transmitted satisfies the following characteristics:
in a period from a first predetermined moment after the first information of the frequency domain bandwidth is transmitted to a moment of occurrence of a predetermined event, a predetermined demodulation reference signal and a reference signal comprised in the first information of the frequency domain bandwidth satisfy a quasi co-location (QCL) relationship;
wherein the predetermined demodulation reference signal comprises: a demodulation reference signal of a control channel in a beam failure recovery search space of the frequency domain bandwidth; and
wherein the predetermined event comprises:
receiving reconfiguration or activation information of a quasi co-location reference signal of the control channel of the frequency domain bandwidth;
wherein the first predetermined moment is acquired based on a subcarrier spacing of an active BWP in the frequency domain bandwidth.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the N frequency domain bandwidths satisfy the following characteristics:
a beam failure request resource corresponding to the N frequency domain bandwidths belongs to one frequency domain bandwidth;
wherein the beam failure request resource comprises at least one of: a Physical Random Access Channel (PRACH) resource, a physical uplink control channel (PUCCH) resource, a physical uplink shared channel (PUSCH) resource, a medium access control-control element (MAC-CE) signaling, or a scheduling request (SR) resource.

### Claim 7 (depends on 1)

The method according to claim 1, further comprising:
in response to a non-empty intersection existing between time domain resources corresponding to beam failure recovery processes of N frequency domain bandwidths, simultaneously performing the beam failure recovery processes of the N frequency domain bandwidths;
wherein a maximum number of the beam failure recovery processes performed simultaneously is smaller than or equal to a predetermined value.

### Claim 8 (depends on 1)

The method according to claim 1, satisfying the following characteristics:
one frequency domain bandwidth comprises one serving cell; or
first information corresponding to the one serving cell comprises first information corresponding to one BWP in the one serving cell, wherein the first information corresponding to the one serving cell comprises reference signal indication information; wherein the one BWP comprises a BWP corresponding to a reference signal corresponding to the reference signal indication information comprised in the first information corresponding to the one serving cell.

### Claim 9 (depends on 1)

The method according to claim 1, wherein the non-empty intersection existing among the time domain resources corresponding to the beam failure recovery processes of the N frequency domain bandwidths comprises at least one of:
in response to requiring transmission of first information corresponding to one frequency domain bandwidth, a beam failure recovery process of at least another frequency domain bandwidth of the N frequency domain bandwidths is being performed;
in response to requiring transmission of first information corresponding to one frequency domain bandwidth, beam failure response information of at least another frequency domain bandwidth of the N frequency domain bandwidths is being monitored; or
in the intersection among the time domain resources corresponding to the beam failure recovery processes of the N frequency domain bandwidths, a beam failure event occurs and has not been recovered successfully for each frequency domain bandwidth in the N frequency domain bandwidths.

### Claim 10 (depends on 1)

The method according to claim 1, further comprising:
determining whether a beam failure event occurs for each frequency domain bandwidth of the N frequency domain bandwidths by detecting a beam failure detection reference signal in a beam failure detection reference signal set corresponding to the each frequency domain bandwidth of the N frequency domain bandwidths, wherein different frequency domain bandwidths correspond to different beam failure detection reference signal sets.

### Claim 11 (depends on 1)

A non-transitory computer-readable storage medium storing a computer program which, when executed by a processor, causes the processor to perform the method according to claim 1.

### Claim 12 (depends on 1)

The method according to claim 1, further comprising determining the following information based on at least one of signaling information or a predetermined rule:
a correspondence relationship between one beam failure request resource and first information of E frequency domain bandwidths;
beam failure recovery parameter information in a case where a frequency domain bandwidth comprises beam failure recovery resource corresponding to first information of F frequency domain bandwidths;
wherein E and F are each an integer greater than 1;
wherein the beam failure request resource comprises at least one of: a PRACH resource, a PUCCH resource, a PUSCH resource, a MAC-CE resource, or an SR resource.

### Claim 13 (depends on 12)

The method according to claim 12, wherein, in the case where the one frequency domain bandwidth comprises the beam failure recovery resource corresponding to the first information of the F frequency domain bandwidths, determining the beam failure recovery parameter information comprises:
determining that the F frequency domain bandwidths correspond to F sets of first-type beam failure recovery parameter information and F sets of second-type beam failure recovery parameter information;
wherein one beam failure recovery resource comprises a beam failure request resource;
wherein the first-type beam failure recovery parameter information comprises a maximum duration corresponding to a beam failure detection timer, and a maximum number of times corresponding to a beam failure detection counter; and
wherein the second-type beam failure recovery parameter information comprises a candidate reference signal set.

### Claim 14 (depends on 12)

The method according to claim 12, satisfying the following characteristics:
the first information of the F frequency domain bandwidths comprises one of: an index of a CC, an index of a CC and indication information of a new reference signal selected from a candidate reference signal set corresponding to a frequency domain bandwidth of the F frequency domain bandwidths; beam failure request information; or information transmitted in response to detecting a beam failure event through detecting one reference signal set corresponding to a frequency domain bandwidth of the F frequency domain bandwidths;
a frequency domain bandwidth of the F frequency domain bandwidths comprises the CC.

### Claim 15

An apparatus for beam failure recovery, comprising a processor and a memory for storing execution instructions that when executed by the processor cause the processor to perform steps in following modules:
a first beam failure recovery module configured to, in response to a non-empty intersection existing among time domain resources corresponding to beam failure recovery processes of N frequency domain bandwidths,
combine the beam failure recovery processes of the N frequency domain bandwidths into a single beam failure recovery process and performing the single beam failure recovery process;
wherein N is an integer greater than 1 and a time domain resource corresponding to a beam failure recovery process of a frequency domain bandwidth of the N frequency domain bandwidths comprises a period from detecting a beam failure event to monitoring beam failure response information;
wherein combining the beam failure recovery processes of the N frequency domain bandwidths into the single beam failure recovery process and performing the single beam failure recovery process comprises: in response to requiring transmission of first information corresponding to one frequency domain bandwidth, determining a first frequency domain bandwidth set, and transmitting first information corresponding to the first frequency domain bandwidth set;
wherein a beam failure event occurs and has not been recovered successfully for each frequency domain bandwidth in the first frequency domain bandwidth set;
wherein the first information corresponding to the first frequency domain bandwidth set comprises first information corresponding to each frequency domain bandwidth in the first frequency domain bandwidth set; and
wherein the first information corresponding to the each frequency domain bandwidth in the first frequency domain bandwidth set comprises an index of a component carrier (CC) or an index of a CC and indication information of a new reference signal selected from a candidate reference signal set corresponding to the each frequency domain bandwidth.

### Claim 16 (depends on 15)

The apparatus according to claim 15, wherein combining the beam failure recovery processes of the N frequency domain bandwidths into the single beam failure recovery process and performing the single beam failure recovery process further comprises at least one of:
selecting one beam failure request resource based on the first frequency domain bandwidth set, and transmitting the first information corresponding to the first frequency domain bandwidth set on the one beam failure request resource;
the first frequency domain bandwidth set comprises M frequency domain bandwidths selected from a second frequency domain bandwidth set, a beam failure event occurs and has not been recovered successfully for each frequency domain bandwidth in the second frequency domain bandwidth set, and M is an integer greater than or equal to 1 and smaller than or equal to N; or
in response to receiving response information corresponding to one frequency domain bandwidth set, determining that a beam failure recovery process corresponding to the one frequency domain bandwidth set is successfully completed.

### Claim 17 (depends on 15)

The apparatus according to claim 15, further comprising an information determination module configured to determine the following information based on at least one of signaling information or a predetermined rule:
a correspondence relationship between one beam failure request resource and first information of E frequency domain bandwidths;
beam failure recovery parameter information in a case where a frequency domain bandwidth comprises beam failure recovery resources corresponding to first information of F frequency domain bandwidths;
wherein E and F are each an integer greater than 1; and
wherein the beam failure request resource comprises at least one of: a PRACH resource, a PUCCH resource, a PUSCH resource, a MAC-CE resource, or an SR resource.

### Claim 18 (depends on 15)

The apparatus according to claim 15, wherein a frequency domain bandwidth of the N frequency domain bandwidth whose first information has been transmitted satisfies the following characteristics:
in a period from a first predetermined moment after the first information of the frequency domain bandwidth is transmitted to a moment of occurrence of a predetermined event, a predetermined demodulation reference signal and a reference signal comprised in the first information of the frequency domain bandwidth satisfy a quasi co-location (QCL) relationship;
wherein the predetermined demodulation reference signal comprises: a demodulation reference signal of a control channel in a beam failure recovery search space of the frequency domain bandwidth; and
wherein the predetermined event comprises:
receiving reconfiguration or activation information of a quasi co-location reference signal of the control channel of the frequency domain bandwidth;
wherein the first predetermined moment is acquired based on a subcarrier spacing of an active BWP in the frequency domain bandwidth.

### Claim 19 (depends on 15)

The apparatus according to claim 15, wherein the N frequency domain bandwidths satisfy the following characteristics:
a beam failure request resource corresponding to the N frequency domain bandwidths belongs to one frequency domain bandwidth;
wherein the beam failure request resource comprises at least one of: a Physical Random Access Channel (PRACH) resource, a physical uplink control channel (PUCCH) resource, a physical uplink shared channel (PUSCH) resource, a medium access control-control element (MAC-CE) signaling, or a scheduling request (SR) resource.

### Claim 20 (depends on 15)

The apparatus according to claim 15, further comprising determining the following information based on at least one of signaling information or a predetermined rule:
a correspondence relationship between one beam failure request resource and first information of E frequency domain bandwidths,
beam failure recovery parameter information in a case where a frequency domain bandwidth comprises beam failure recovery resource corresponding to first information of F frequency domain bandwidths;
wherein each of E and F is an integer greater than 1;
wherein the beam failure request resource comprises at least one of: a PRACH resource, a PUCCH resource, a PUSCH resource, a MAC-CE resource, or an SR resource;
wherein, in the case where the one frequency domain bandwidth comprises the beam failure recovery resource corresponding to the first information of the F frequency domain bandwidths, determining the beam failure recovery parameter information comprises:
determining that the F frequency domain bandwidths correspond to F sets of first-type beam failure recovery parameter information and F sets of second-type beam failure recovery parameter information;
wherein one beam failure recovery resource comprises a beam failure request resource;
wherein the first-type beam failure recovery parameter information comprises a maximum duration corresponding to a beam failure detection timer, and a maximum number of times corresponding to a beam failure detection counter;
wherein the second-type beam failure recovery parameter information comprises a candidate reference signal set;
wherein the first information of the F frequency domain bandwidths comprises one of: an index of a CC, an index of a CC and indication information of a new reference signal selected from a candidate reference signal set corresponding to a frequency domain bandwidth of the F frequency domain bandwidths; beam failure request information; or information transmitted in response to detecting a beam failure event through detecting one reference signal set corresponding to a frequency domain bandwidth of the F frequency domain bandwidths; and
wherein a frequency domain bandwidth of the F frequency domain bandwidths comprises the CC.