Methods and arrangements in a network node

摘要

A method and arrangement in a first network node, which is serving a user equipment, for determining whether a handover of the user equipment is to be made to a second network node. The first network node and the second network node are configured for wireless communication with each other over a backhaul link in half-duplex communication mode. The first network node obtains an estimation of data-rate performance over the backhaul link, and determines whether to hand over the user equipment to the second network node based on the obtained estimation of the data-rate performance over the backhaul link.

主权项

1. A method in a base station, which is serving a user equipment, for determining whether a handover of the user equipment is to be made to a relay node, wherein the base station and the relay node are configured for wireless communication with each other over a backhaul link in half-duplex communication mode, the method comprising:
obtaining an estimation of data-rate performance over the backhaul link; obtaining an estimation of data-rate performance over a first radio link between the base station and the user equipment; obtaining an estimation of data-rate performance over a second radio link between the relay node and the user equipment; and determining to hand over the user equipment to the relay node, based on end-to-end data rate performance including the obtained estimation of the data-rate performance over the half-duplex backhaul link between the base station and the relay node and the estimations of data-rate performance over the first and second radio links with the user equipment; wherein the base station avoids Ping-Pong effects related to the handover of the user equipment to the relay node by:
determining whether the relay node implements a handover criterion compatible with the method in the base station; andrefraining from performing the handover based on a computed end-user data-rate estimate if the relay node does not implement a compatible handover criterion.