Back to results
US 9,439,112 B2Granted
Low overhead mobility in local area wireless network
AssigneeMediatek Inc.
InventorChia-Chun Hsu
Life of this patent
Estimating the term…
Abstract
In a heterogeneous network, enhanced handover and reestablishment procedures are proposed within a local area network. The enhanced procedures are more efficient, e.g., with less signaling and less data interruption than the legacy mobility mechanism. In a local area network, a UE is served by an anchor eNB in macro cell layer and one or more drift eNBs in small cell layer. When the UE moves within the local area network, the UE anchor does not need to change. For cell change within the same anchor, the enhanced procedures reduces signaling overhead and data interruption time.
Claims24
A method, comprising:
- establishing a radio resource control (RRC) connection by a user equipment (UE) with an anchor base station (eNB) in a mobile communication network, wherein the UE is also served by a source drift eNB;
- receiving measurement configuration from the anchor eNB or from the source drift eNB, wherein the measurement configuration controls UE measurements and reporting frequency;
- and
- transmitting a measurement report to trigger a cell change within the same anchor if a cell change condition is satisfied, wherein the measurement report indicates or comprises a request for changing a source small cell served by the source drift eNB to a target small cell served by a target drift eNB, and wherein after the cell change the UE is connected with the anchor base station and the target drift eNB.
1 more element
A user equipment (UE), comprising:
- a radio resource control (RRC) module that establishes an RRC connection with an anchor base station (eNB) in a mobile communication network, wherein the UE is also served by a source drift eNB;
- a receiver that receives measurement configuration from the anchor eNB or from the source drift eNB, wherein the measurement configuration controls UE measurements and reporting frequency;
- and
- a transmitter that transmits a measurement report to trigger a cell change within the same anchor if a cell change condition is satisfied, wherein the measurement report indicates or comprises a request for changing a source small cell served by the source drift eNB to a target small cell served by a target drift eNB, and wherein after the cell change the UE is connected with the anchor base station and the target drift eNB.
1 more element
A method, comprising:
- (a) receiving a measurement configuration by a user equipment (UE) served by an anchor eNB in a macro cell and a source drift eNB in a small cell;
- (b) determining whether a target drift eNB is feasible for anchor-drift pairing;
- (c) determining whether to perform an enhanced radio resource control (RRC) connection reestablishment procedure with the target drift eNB based on whether a measurement report is triggered or whether a condition for cell change within the same anchor is met;
- and
- (d) transmitting an RRC connection reestablishment request to the target drift eNB, wherein the RRC reestablishment request comprises anchor eNB information containing a physical cell ID (PCI) and frequency of the anchor eNB so that the target drift eNB can recognize the anchor eNB for anchor-drift pairing.
2 more elements
A user equipment (UE), comprising:
- a receiver that receives a measurement configuration served by an anchor eNB in a macro cell and a source drift eNB in a small cell;
- a mobility module that determines whether a target drift eNB is feasible for anchor-drift pairing, wherein the mobility module also determines whether to perform an enhanced radio resource control (RRC) connection reestablishment procedure with the target drift eNB based on whether a measurement report is triggered or whether a condition for cell change within the same anchor is met;
- and
- a transmitter that transmits an RRC connection reestablishment request to the target drift eNB, wherein the RRC reestablishment request comprises anchor eNB information containing a physical cell ID (PCI) and frequency of the anchor eNB so that the target drift eNB can recognize the anchor eNB for anchor-drift pairing.
1 more element
Dependencies are inferred from the claim text.