Reducing handover interruption with two transmitters and receivers
AssigneeNokia Technologies Oy
InventorsIngo Viering, Jedrzej Stanczak, Ahmad Awada, Tero Henttonen
Life of this patent
Estimating the term…
Abstract
A technique of performing a HO includes the source BS sending a HO resume message to the UE at the conclusion of a RACH access procedure that occurs in response to a HO command while a second TRX of the UE continues to exchange data packets with the source BS as if no HO command were issued. By continuing to exchange data with the source BS as if there were no HO command until the HO resume message reintroduces a RACH-less HO procedure, the interruption may be reduced to about 4 msec. At any point in time the UE handles only one protocol stack and only one security, which avoids the complexity of the advanced prior art methods.
Claims20
A method, comprising:
- receiving, by a user equipment having a first transceiver and a second transceiver, a handover command from a source base station;
- after receiving the handover command, performing, by the user equipment, a random access channel access operation in which configuration information is shared between the user equipment and a target base station using the second transceiver, the random access channel access operation being performed while the user equipment exchanges data packets with the source base station using the first transceiver;
- and
- after completing the performing of the random access channel access operation, receiving, by the user equipment, a handover resume message from the source base station.
An apparatus, 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 apparatus at least to:
- receive a handover command from a source base station;
- after reception of the handover command, perform a random access channel access operation in which configuration information is shared between the apparatus and a target base station using a second transceiver, the random access channel access operation being performed while the apparatus exchanges data packets with the source base station using a first transceiver;
- and
- after completion of the performing of the random access channel access operation, receive a handover resume message from the source base station.
An apparatus, 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 apparatus at least to:
- send a handover command to a user equipment;
- after sending the handover command, exchange data packets with the user equipment;
- after sending the handover command, receive a random access channel access complete notification that a random access channel access operation in which configuration information is shared between the user equipment and a target base station has completed, the random access channel access operation having been performed by the user equipment after the user equipment receives the handover command;
- and
- after reception of the random access channel complete notification, send a handover resume message to the user equipment.
Dependencies are inferred from the claim text.