Management of radio link failure in wireless backhaul

An apparatus for wireless backhaul communications at a relay device, comprising:

• a processor,
• memory coupled with the processor;
• and
• instructions stored in the memory and executable by the processor to cause the apparatus to:
• receive, at the relay device and from a first upstream backhaul device, a first message comprising a first indication of an upstream radio link failure at a first upstream wireless backhaul link between the first upstream backhaul device and a second upstream backhaul device of a wireless backhaul, wherein the wireless backhaul comprises the first upstream wireless backhaul link, a second upstream wireless backhaul link between the relay device and the first upstream backhaul device different from the first upstream wireless backhaul link, and a downstream wireless backhaul link between the relay device and a first downstream device;
• initiate recovery procedures at the relay device based at least in part on the first indication of the upstream radio link failure;
• transmit, to the first downstream device and using a scrambling sequence for the upstream radio link failure, a second message instructing the first downstream device to increase a number of measurements corresponding to a second relay device, wherein the scrambling sequence used indicates the upstream radio link failure over the downstream wireless backhaul link;
• suspend, after a delay associated with the recovery procedures failing at the relay device, transmission of synchronization channels and broadcast channels via the downstream wireless backhaul link between the relay device and the first downstream device;
• and
• transmit, based at least in part on the upstream radio link failure, buffered data to the first downstream device via the downstream wireless backhaul link.

An apparatus for wireless backhaul communications at a relay device, comprising:

• means for receiving, at the relay device and from a first upstream backhaul device, a first message comprising a first indication of an upstream radio link failure at a first upstream wireless backhaul link between the first upstream backhaul device and a second upstream backhaul device of a wireless backhaul, wherein the wireless backhaul comprises the first upstream wireless backhaul link, a second upstream wireless backhaul link between the relay device and the first upstream backhaul device different from the first upstream wireless backhaul link, and a downstream wireless backhaul link between the relay device and a first downstream device;
• means for initiating recovery procedures at the relay device based at least in part on the first indication of the upstream radio link failure;
• means for transmitting, to the first downstream device and using a scrambling sequence for the upstream radio link failure, a second message instructing the first downstream device to increase a number of measurements corresponding to a second relay device, wherein the scrambling sequence used indicates the upstream radio link failure over the downstream wireless backhaul link;
• means for suspending, after a delay associated with the recovery procedures failing at the relay device, transmission of synchronization channels and broadcast channels via the downstream wireless backhaul link between the relay device and the first downstream device;
• and
• means for transmitting, based at least in part on the upstream radio link failure, buffered data to the first downstream device via the downstream wireless backhaul link.

A non-transitory computer-readable medium storing code for wireless backhaul communications at a relay device, the code comprising instructions executable by a processor to:

• receive, at the relay device and from a first upstream backhaul device, a first message comprising a first indication of an upstream radio link failure at a first upstream wireless backhaul link between the first upstream backhaul device and a second upstream backhaul device of a wireless backhaul, wherein the wireless backhaul comprises the first upstream wireless backhaul link, a second upstream wireless backhaul link between the relay device and the first upstream backhaul device different from the first upstream wireless backhaul link, and a downstream wireless backhaul link between the relay device and a first downstream device;
• initiate recovery procedures at the relay device based at least in part on the first indication of the upstream radio link failure;
• transmit, to the first downstream device and using a scrambling sequence for the upstream radio link failure, a second message instructing the first downstream device to increase a number of measurements corresponding to a second relay device, wherein the scrambling sequence used indicates the upstream radio link failure over the downstream wireless backhaul link;
• suspend, after a delay associated with the recovery procedures failing at the relay device, transmission of synchronization channels and broadcast channels via the downstream wireless backhaul link between the relay device and the first downstream device;
• and
• transmit, based at least in part on the upstream radio link failure, buffered data to the first downstream device via the downstream wireless backhaul link.