Handover Improvement for High Speed User Equipment in LTE

摘要

Methods and apparatus are disclosed for handing over of a high-speed mobile terminal or user equipment from a source network node to a target network node. Reliable methods for measuring the speed of a moving user equipment are disclosed. Parameters used in a handover procedure are also adjusted in accordance with the speed of the user equipment. For handing over a high-speed user equipment, the present application discloses that the source network node can coordinate with the target network node and other candidate network nodes in transmitting a handover command to prevent handover failures.

主权项

1. A method of handing over a wireless device moving at a high speed from a source base station to a target base station, comprising:
measuring a speed of the wireless device; estimating a channel quality based on a channel quality index report from the wireless device; and depending on the measured speed and the estimated channel quality, signaling one or more candidate base stations to coordinate with the source base station for transmitting a handover command to the wireless device, wherein the signaling requests the one or more candidate base stations to transmit the handover command to the wireless device for handing over the wireless device from the source base station to the target base station, wherein the one or more candidate base stations include at least one base station other than the target base station and are included in a recent measurement report from the wireless device.