Apparatus, method, and computer program

1 . A user equipment comprising:

at least one processor; and

at least one memory including computer program code;

the at least one memory and the computer program code configured to, with the at least one processor, cause the user equipment at least to:

prior to a radio link failure between a serving cell and the user equipment, receive from the serving cell, a configuration of at least one resource to perform a random access procedure with a neighbouring cell, wherein the at least one resource to perform the random access procedure comprises a dedicated resource or a shared resource, and wherein the at least one resource to perform the random access procedure is associated with a threshold specific to a reference signal;

detect a radio link failure between the serving cell and the user equipment; and

use the at least one resource configured prior to the radio link failure to perform the random access procedure with the neighbouring cell as part of a radio resource control connection re-establishment procedure, wherein the random access procedure is performed using the at least one resource configured prior to the radio link failure only when measurements on the reference signal are above the threshold; and

perform a legacy contention based random access procedure when the at least one resource configured prior to the radio link failure does not comprise a random access preamble to perform a legacy contention free random access procedure and when the threshold specific to the reference signal is not met, wherein the user equipment is to acquire system information of the neighbouring target cell before performing the legacy contention based random access procedure.

2 . The user equipment of claim 1 , wherein the at least one resource comprises at least one of a physical uplink shared channel occasion, a physical random access channel occasion or a random access channel preamble.

3 . The user equipment of claim 1 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the user equipment at least to:

prior to a radio link failure between the serving cell and the user equipment, receive an indication indicating whether the at least one resource to perform the random access procedure comprises the dedicated resource or the shared resource from the serving cell.

4 . The user equipment of claim 3 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the user equipment at least to:

prior to a radio link failure between the serving cell and the user equipment, receive an indication indicating whether there are other user equipment configured with the same at least one resource to perform the random access procedure.

5 . The user equipment of claim 1 , wherein the at least one resource to perform the random access procedure is valid for a limited duration.

6 . A method comprising:

prior to a radio link failure between a serving cell and a user equipment, receive, receiving, by the user equipment from the serving cell, a configuration of at least one resource to perform a random access procedure with a neighbouring cell, wherein the at least one resource to perform the random access procedure comprises a dedicated resource or a shared resource, and wherein the at least one resource to perform the random access procedure is associated with a threshold specific to a reference signal;

detecting a radio link failure between the serving cell and the user equipment; and

using the at least one resource configured prior to the radio link failure to perform the random access procedure with the neighbouring cell as part of a radio resource control connection re-establishment procedure, wherein the random access procedure is performed using the at least one resource configured prior to the radio link failure only when measurements on the reference signal are above the threshold; and

performing a legacy contention based random access procedure when the at least one resource configured prior to the radio link failure does not comprise a random access preamble to perform a legacy contention free random access procedure and when the threshold specific to the reference signal is not met, wherein the user equipment is to acquire system information of the neighbouring target cell before performing the legacy contention based random access procedure.