Method and Device for Mobility Control
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsMin Huang, Hui GUO, Yang LIU, Jiying XU
Life of this patent
Estimating the term…
Abstract
The embodiments disclose methods and devices for mobility control of UEs in a HetNet with multiple frequency carriers. In the methods, intra-frequency measurement and inter-frequency measurement are performed sequentially for determining a target cell to handover to.
Claims21
A method of mobility management for a user equipment, UE, in a wireless communication network, the network comprising at least a first radio base station, RBS, serving at least a first cell over a first frequency and a second cell over a second frequency, and a second RBS serving at least a third cell over the first frequency and a fourth cell over the second frequency, wherein the first cell and the second cell are macro cells and are overlapped, the third cell and the fourth cell are small cells and are overlapped, the first frequency and the second frequency are different, the third cell and the fourth cell are within the first cell and the second cell, and the third cell is a protected cell, the method comprising:
- performing intra-frequency measurement for determining whether the UE is within cell range extension, CRE, area of the fourth cell, with a first positive bias for downlink signal quality of the fourth cell being applied for handover triggering condition;
- in case that the UE connected to the second cell or the fourth cell is within the CRE area of the fourth cell, performing the following steps:
- performing inter-frequency measurement for a target cell selection, with a second positive bias for downlink signal quality of the third cell being applied for handover triggering condition;
- and
- performing handover to the target cell.
A user equipment, UE, in a wireless communication network, the network comprising at least a first radio base station, RBS, serving at least a first cell over a first frequency and a second cell over a second frequency, and a second RBS serving at least a third cell over the first frequency and a fourth cell over the second frequency, wherein the first cell and the second cell are macro cells and are overlapped, the third cell and the fourth cell are small cells and are overlapped, the first frequency and the second frequency are different, the third cell and the fourth cell are within the first cell and the second cell, and the third cell is a protected cell, the UE comprising:
- an intra-frequency measuring component, adapted for performing intra-frequency measurement for determining whether the UE is within cell range extension, CRE, area of the fourth cell, with a first positive bias for downlink signal quality of the fourth cell being applied for handover triggering condition;
- an inter-frequency measuring component, adapted for performing inter-frequency measurement for a target cell selection with a second positive bias for downlink signal quality of the third cell being applied for handover triggering condition in case that the UE connected to the second cell or the fourth cell is within the CRE area of the fourth cell;
- and
- a first handover component, adapted for performing handover to the target cell.
A method of mobility management for a user equipment, UE, in a wireless communication network, the network comprising at least a first radio base station, RBS, serving at least a first cell over a first frequency and a second cell over a second frequency, and a second RBS serving at least a third cell over the first frequency and a fourth cell over the second frequency, wherein the first cell and the second cell are macro cells and are overlapped, the third cell and the fourth cell are small cells and are overlapped, the first frequency and the second frequency are different, the third cell and the fourth cell are within the first cell and the second cell, and the third cell is a protected cell, the method being performed in the RBS, comprising:
- determining position of the UE in relation to cell range extension, CRE, area of the fourth cell via intra-frequency measurement, with a first positive bias for downlink signal quality of the fourth cell being applied for handover triggering condition;
- in case that the UE connected to the second cell or the fourth cell is within the CRE area of the fourth cell, performing the following steps:
- selecting a target cell via at least inter-frequency measurement, with a second positive bias for downlink signal quality of the third cell being applied for handover triggering condition;
- and
- commanding the UE to perform handover to the target cell.
21-28. (canceled)
Dependencies are inferred from the claim text.