Method and apparatus for managing handovers
A method, apparatus, and computer program product are provided to manage handover procedures in a dual connection context. In the context of a method, a macro access point (MAP) may initiate a handover between a source and destination local area access point (LAAP) by causing a handover request to be transmitted to the destination LAAP. The method may further involve causing a handover command to be transmitted to a user equipment (UE), causing a data transfer inform message to be transmitted to the source LAAP, and receiving a UE context release message from the destination LAAP. In the context of another method, a LAAP may initiate a handover. The method may involve receiving a dual connection transfer request message from a source LAAP, receiving a dual connection transfer request acknowledge message from a destination LAAP and receiving a Path Switch Successful indication from a Mobility Management Entity.
1. A method, comprising:
transmitting, by circuitry of a macro access point (MAP), a handover request message to a destination local area access point (LAAP);
transmitting, by the circuitry, a handover command to a user equipment (UE);
transmitting, by the circuitry, a data transfer inform message to a source LAAP; and
receiving, by the circuitry, a UE context release message from the destination LAAP.
2. The method of claim 1 , further comprising, before transmitting the handover request to the destination LAAP:
transmitting at least one measurement configuration indication to be transmitted to the UE;
receiving at least one measurement report from the UE; and
determining, by the circuitry, based on the at least one measurement report, whether to initiate a handover of the UE from the source LAAP to the destination LAAP.
3. The method of claim 2 , wherein the measurement configuration indication comprises one or more parameters indicating that measurements on a macro cell associated with the MAP and on local area cells are to be reported to the MAP.
4. The method of claim 2 , wherein the determination of whether to initiate the handover of the user equipment from the source LAAP to the destination LAAP is further based on Radio Resource Management (RRM) information.
5. The method of claim 1 , wherein the handover request message comprises a UE X2 signaling context reference, a UE SI Evolved Packet Core (EPC) signaling context reference, and an Evolved Universal Terrestrial Radio Access Network Radio Access Bearer (E-RAB) context.
6. An apparatus, comprising:
circuitry for a macro access point, the circuitry configured to
transmit a handover request message to a destination local area access point (LAAP);
transmit a handover command to a user equipment (UE);
transmit a data transfer inform message to a source LAAP; and
receive a UE context release message from the destination LAAP.
7. The apparatus of claim 6 , wherein the circuitry is further configured to, before transmitting the handover request to the destination LAAP:
transmit a measurement configuration indication to the UE;
receive at least one measurement report from the UE; and
determine, based on the at least one measurement report, whether to initiate a handover of the UE from the source LAAP to the destination LAAP.
8. The apparatus of claim 7 , wherein the measurement configuration indication comprises one or more parameters indicating that measurements on a macro cell associated with the MAP and on local area cells are to be reported to the MAP.
9. The apparatus of claim 7 , wherein the determination of whether to initiate the handover of the user equipment from the source LAAP to the destination LAAP is further based on Radio Resource Management (RRM) information.
10. The apparatus of claim 6 , wherein the handover request message comprises a UE X2 signaling context reference, a UE SI Evolved Packet Core (EPC) signaling context reference, and an Evolved Universal Terrestrial Radio Access Network Radio Access Bearer (E-RAB) context.
11. The apparatus of claim 6 , wherein the circuitry is further configured to receive a handover request acknowledge message.
12. The apparatus of claim 6 , wherein the handover command comprises a Radio Resource Control (RRC) message.
13. The apparatus of claim 12 , wherein the RRC message comprises an RRCConnectionReconfiguration message including a DualConnectionControlInfor Information Element (IE).
14. The apparatus of claim 6 , wherein the handover command comprises an indication of whether a current local area connection should be released or whether a dual connection should be released.
15. The apparatus of claim 6 , wherein the circuitry is further configured to receive a Sequence Number (SN) status transfer message from the source LAAP.
16. The apparatus of claim 15 , wherein the circuitry is further configured to cause the SN status transfer message to be sent to the destination LAAP.
17. The apparatus of claim 6 , wherein the circuitry is further configured to receive a handover failure indication from the UE and, in response, establish a singular connection with the UE.
18. The apparatus of claim 6 , wherein the circuitry is further configured to receive a path switch request acknowledge message from a Mobility Management Entity (MME).
19. The apparatus of claim 6 , wherein the circuitry is further configured to transmit the UE context release message to the source LAAP.
20. A non-transitory computer readable storage medium storing program code portions which, when executed by circuitry of a macro access point (MAP), cause the MAP to:
transmit a handover request message to a destination local area access point (LAAP);
transmit a handover command to a user equipment (UE);
transmit a data transfer inform message to a source LAAP; and
receive a UE context release message from the destination LAAP.