Multi-beam random access procedure in handover execution

A user equipment (UE) comprising:

• an interface configured to receive a configuration message from a network node, the configuration message comprising information about one or more dedicated random access channel (RACH) resources associated with one or more beams of a target cell, wherein the information further comprising at least one synchronization signal block (SSB) threshold and at least one channel state information reference signal (CSI-RS) threshold;
• and
• processing circuitry configured to:
• obtain an estimate of a beam quality for each beam associated with the one or more dedicated RACH resources in the configuration message;
• upon determining there is at least one SSB with a beam quality greater than the at least one SSB threshold, select an SSB with a beam quality greater than the SSB threshold;
• and
• upon determining there is no SSB with a beam quality greater than the at least one SSB threshold and there is at least one CSI-RS with a beam quality greater than the CSI-RS threshold, select a CSI-RS with a beam quality greater than the CSI-RS threshold;
• and
• wherein the interface is further configured to transmit a random access preamble using the selected SSB or CSI-RS.

A system comprising:

• a network node configured to transmit a configuration message to a user equipment (UE);
• and
• a UE, wherein the UE is configured to:
• receive the configuration message from the network node, the configuration message comprising information about one or more dedicated random access channel (RACH) resources associated with one or more beams of a target cell, wherein the information further comprising at least one synchronization signal block (SSB) threshold and at least one channel state information reference signal (CSI-RS) threshold;
• obtain an estimate of a beam quality for each beam associated with the one or more dedicated RACH resources in the configuration message;
• upon determining there is at least one SSB with a beam quality greater than the at least one SSB threshold, select an SSB with a beam quality greater than the SSB threshold;
• upon determining there is no SSB with a beam quality greater than the at least one SSB threshold and there is at least one CSI-RS with a beam quality greater than the CSI-RS threshold, select a CSI-RS with a beam quality greater than the CSI-RS threshold;
• and
• transmit a random access preamble using the selected SSB or CSI-RS.