Methods, systems, and devices for network-provided autonomous handover
Embodiments of the present disclosure describe methods, systems, and devices for facilitating transfer of user equipment (UE) handover in multi-cell networks. A source evolved node B (eNB) may transmit an autonomous handover grant to a UE along with an indication of a target eNB. The source eNB may also make a handover request to the target eNB and provide a UE context to the target eNB. Upon transmission of a handover command, the UE may perform a random access channel procedure to connect to the target eNB. Because the eNB may have the UE context (or may be able to fetch the context), the handover time may be lessened. Other embodiments may be described and/or claimed.
1. An apparatus to be implemented in a source evolved node B (eNB), the apparatus comprising:
handover control circuitry to:
determine, based on a measurement report received from a user equipment (UE), that a connection of the UE is to be handed over to a target eNB;
generate, based on said determination that the connection is to be handed over, an autonomous handover grant that includes one or more parameters that correspond to a target cell provided by the target eNB to facilitate a handover of the connection;
facilitate provision of a context for the UE to the target eNB; and
radio frequency (RF) control circuitry to control RF circuitry to transmit the autonomous handover grant to the UE.
2. The apparatus of claim 1 , wherein the one or parameters includes an identification of the target eNB.
3. The apparatus of claim 1 , wherein the one or more parameters includes system information block (SIB) information for the target eNB.
4. The apparatus of claim 1 , wherein the one or parameters includes a permit for the target eNB to obtain the context for the UE.
5. The apparatus of claim 1 , wherein the one or more parameters includes a handover command timer value to define a time period after which the UE can proceed with the handover without receiving a handover command.
6. The apparatus of claim 1 , wherein the handover control circuitry is to facilitate provision of the context for the UE to the target eNB through transmission of the context to the target eNB.
7. The apparatus of claim 1 , wherein the handover control circuitry is to facilitate provision of the context for the UE to the target eNB through transmission of the context to an anchor node which is to transmit the context for the UE to the target eNB.
8. The apparatus of claim 1 , wherein:
the handover control circuitry is further to generate a handover command; and
the RF control circuitry is to control the RF circuitry to transmit the handover command to the UE.
9. The apparatus of claim 1 , wherein the handover control circuitry is further to:
cause a handover request to be transmitted to the target eNB; and
process an acknowledgement from the target eNB in response to transmission of the handover request to the target eNB; and
generate a handover command based on the acknowledgement.
10. An apparatus to be implemented in a user equipment (UE), comprising:
handover control circuitry to:
generate a measurement report based on a connection with a source evolved node B (eNB);
process an autonomous handover grant transmitted from the source eNB, that includes one or more parameters that correspond to a target cell provided by a target eNB, the one or more parameters to include a handover timer value;
identify a target eNB which will receive a context for the UE;
start a timer with the handover timer value;
if a handover command is received before expiration of the timer, initiate a non-contention-based random access channel (RACH) process; and
if a handover command is not received before expiration of the timer, initiate a contention-based RACH process; and
radio frequency (RF) control circuitry to control RF circuitry to transmit the measurement report to the source eNB and receive the autonomous handover grant from the source eNB.
11. The apparatus of claim 10 , wherein the one or more parameters include an identification of the target eNB.
12. The apparatus of claim 10 , wherein:
the RF control circuitry is further to receive a handover command transmitted from the source eNB; and
the handover control circuitry is further to process the handover command transmitted from the source eNB.
13. The apparatus of claim 10 , wherein the handover control circuitry is further to, upon completion of the timer, and in the absence of receipt of a handover command by the UE, identify the target eNB from amongst one or more available eNBs.
14. The apparatus of claim 13 , wherein the one or more parameters of the autonomous handover grant include identification of the one or more available eNBs.
15. The apparatus of claim 10 , wherein the one or more parameters of the autonomous handover grant include identification of one or more system information blocks for the target cell.