METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING FAILURE INFORMATION AND SYSTEM

1 . An apparatus for transmitting failure information of a remote user equipment, the remote user equipment being configured or activated with a first path and a second path, the apparatus comprising:

a transmitting unit configured to transmit failure information to a network device via the second path in a case where the first path fails.

2 . The apparatus according to claim 1 , wherein the path failure comprises at least one of the following cases where:

a radio link failure of a PC5 interface of the remote user equipment or a beam failure or a failure of performing beam failure recovery is detected;

a notification of a radio link failure of a Uu interface of a relay user equipment or a failure of radio resource control connection of the relay user equipment or handover of the relay user equipment or a failure of beam failure recovery of the relay user equipment transmitted by the relay user equipment is received;

establishment of PC5 connection with relay user equipment fails;

a radio link failure of a Uu interface of the remote user equipment or a beam failure or a failure of performing beam failure recovery of the remote user equipment is detected;

synchronous reconfiguration of the PC5 interface and/or Uu interface of the remote user equipment fails; or

configuration of the PC5 interface and/or Uu interface of the remote user equipment fail(s).

3 . The apparatus according to claim 2 , wherein,

the notification of a radio link failure of a Uu interface of a relay user equipment or a failure of radio resource control connection of the relay user equipment or handover of the relay user equipment is transmitted via a PC5-RRC message.

4 . The apparatus according to claim 1 , wherein,

the first path is a direct path, and the second path is an indirect path; or, the first path is an indirect path, and the second path is a direct path.

5 . The apparatus according to claim 1 , wherein the second path is an available path, the available path satisfying at least one of the following conditions that:

channel quality of the available path is higher than a first threshold;

channel quality of the available path satisfies criteria for cell selection and/or cell reselection;

channel quality of the available path satisfies criteria for relay selection and/or relay reselection;

the available path is an indirect path and no radio link failure or beam failure or beam failure recovery failure of the PC5 interface is detected on the indirect path;

the available path is an indirect path and no notification of a radio link failure of a Uu interface of a relay user equipment or a failure of radio resource control connection of the relay user equipment or handover of the relay user equipment or a failure of beam failure recovery of the relay user equipment transmitted by the relay user equipment is received;

the available path is an indirect path and synchronization reconfiguration failure of the PC5 interface of the remote user equipment does not occur on the indirect path;

the available path is an indirect path and configuration failure of the PC5 interface of the remote user equipment does not occur on the indirect path;

the available path is an indirect path and a failure of establishment of PC5 connection with the relay user equipment does not occur on the indirect path;

the available path is a direct path and a radio link failure or a beam failure or a failure of beam failure recovery of a PC5 interface is not detected on the direct path;

the available path is a direct path and no synchronization reconfiguration failure of the Uu interface of the remote user equipment occurs on the direct path;

the available path is a direct path and no Uu interface configuration failure of the remote user equipment occurs on the direct path; or

the available path is not deactivated or de-configured.

6 . The apparatus according to claim 1 , wherein the failure information comprises at least one of the following:

failure indication information, failure type information, a measurement result of a serving cell, measurement results of other cells and/or frequencies, a measurement result of a connected relay user equipment, or measurement results of other relay user equipments.

7 . The apparatus according to claim 6 , wherein the failure indication information comprises at least one of the following:

a radio link failure of a Uu interface, a beam failure of a Uu interface, a failure of beam failure recovery of a Uu interface, a radio link failure of a PC5 interface, a beam failure of a PC5 interface, a failure of beam failure recovery of a PC5 interface, a radio link failure of the Uu interface of the relay user equipment, handover of the relay user equipment, a radio resource control connection failure of the relay user equipment, a failure of beam failure recovery, a failure of establishment of PC5 connection, a failure of synchronous reconfiguration of a Uu interface, a failure of configuration of a Uu interface, a failure of synchronous reconfiguration of a PC5 interface and a failure of configuration of a PC5 interface of the relay user equipment.

8 . The apparatus according to claim 1 , wherein the apparatus further comprises:

a processing unit configured to trigger a radio resource control connection reestablishment process when both the first path and the second path fail, and/or, trigger a radio resource control connection reestablishment process when the first path fails and the first path is a primary path.

9 . The apparatus according to claim 1 , wherein,

when the first path fails, the first path is a secondary path, the second path is available and the second path is a primary path, the transmitting unit transmits the failure information to a network device via the second path.

10 . The apparatus according to claim 9 , wherein,

the primary path and/or the secondary path is configured by the network device or is predefined.

11 . The apparatus according to claim 1 , wherein,

the failure information is transmitted via a radio resource control message.

12 . An apparatus for receiving failure information, comprising:

a receiving unit configured to, in a case where a first path fails, receive via a second path, failure information transmitted by a remote user equipment, wherein the remote user equipment is configured or activated with the first path and the second path.

13 . The apparatus according to claim 12 , wherein the apparatus further comprises:

a transmitting unit configured to transmit first configuration information for configuring the first path to the remote user equipment or a relay user equipment according to the failure information.

14 . The apparatus according to claim 12 , wherein the apparatus further comprises:

a transmitting unit configured to transmit second configuration information for configuring a primary path and/or a secondary path to the remote user equipment.

15 . The apparatus according to claim 12 , wherein,

the first path is a direct path, and the second path is an indirect path; or, the first path is an indirect path, and the second path is a direct path.

16 . The apparatus according to claim 12 , wherein the failure information comprises at least one of the following:

failure indication information, failure type information, a measurement result of a serving cell, measurement results of other cells and/or frequencies, a measurement result of a connected relay user equipment, or measurement results of other relay user equipments.

17 . The apparatus according to claim 16 , wherein the failure indication information comprises at least one of the following:

a radio link failure of a Uu interface, a beam failure of a Uu interface, a failure of beam failure recovery of a Uu interface, a radio link failure of a PC5 interface, a beam failure of a PC5 interface, a failure of beam failure recovery of a PC5 interface, a radio link failure of the Uu interface of the relay user equipment, handover of the relay user equipment, a radio resource control connection failure of the relay user equipment, a failure of beam failure recovery, a failure of establishment of PC5 connection, a failure of synchronous reconfiguration of a Uu interface, a failure of configuration of a Uu interface, a failure of synchronous reconfiguration of a PC5 interface and a failure of configuration of a PC5 interface of the relay user equipment.

18 . The apparatus according to claim 12 , wherein,

the failure information is received via a radio resource control message.

19 . A communication system, comprising a remote user equipment and a network device, the remote user equipment being configured or activated with a first path and a second path, wherein,

the user equipment transmits failure information to the network device via the second path in a case where the first path fails,

the network device receives the failure information via the second path.