Method for managing handover of user equipment

Abstract

Provided are a method and arrangement (600) in a first network node (120-1) for managing handover of user equipment (110) from the first network node (120-1) to a second network node (120-2). The method and arrangement (600) comprise transmitting (501) a handover message to the user equipment (1 10), wherein handover message triggers the user equipment (1 10) to perform the handover, and to establishing (502) a limit related to the amount of retransmissions to be made. Further the method and arrangement (600) comprise interrupting (503) scheduling of resources to the user equipment (110) and inhibiting further retransmissions of the handover message, when either the established limit is reached, or an indication that the user equipment (110) has left the first cell (130-1) is received. Also, a method and arrangements (800) in a in a second network node (120-2) are disclosed.

Description

Technical field [0001] The present disclosure relates to a method and arrangement in a first network node in a wireless communication system and a method and arrangement in a second network node. Specifically, it involves the handover of the user equipment from the first network node to the second network node. Background technique [0002] A mobile station (MS), also called a mobile terminal, a wireless terminal, and / or a user equipment (UE), can communicate wirelessly in a wireless communication system sometimes called a cellular radio system. The communication can be carried out between two mobile stations, between a mobile station and a normal phone, and / or between a mobile station and a server, for example via a radio access network (RAN) and possibly one or more core networks. [0003] A mobile station may also be called a mobile phone, cell phone, iPad, laptop device, or any other similar device with wireless capabilities. A mobile station herein may be, for example, a por...

AI Technical Summary

Problems solved by technology

However some user equipment can initiate a handover without sending any acknowledgment, so the source network node can't know if the user equipment did send an acknowledgment, or if something went wrong in reception / transmission; or if the user equipment didn't know that it had a message addressed to it , so no acknowledgment can be sent; or whether the user equipment has successfully received the handover command and initiated the handover without sending any acknowledgment

[0016] Thereby the source network node continues to retransmit the handover command just in case, thus causing increased exposure to intra-cell interference

Moreover, the transmission capacity of the system is reduced due to keeping resources scheduled for user equipments that are no longer present in the cell

[0017] However since handovers are usually performed at cell edges where signal propagation conditions may be somewhat degraded, if the source network node does not perform retransmissions at all in the described scenario, the user equipment will experience the risk of being disconnected

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