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    • 4. 发明申请
    • RRC CONNECTION RE-ESTABLISHMENT IN THE PRESENCE OF PCI CONFUSION
    • 无线电通信局连接重组PCI存在
    • WO2014180599A1
    • 2014-11-13
    • PCT/EP2014/055966
    • 2014-03-25
    • NOKIA SOLUTIONS AND NETWORKS OY
    • DE BENEDITTIS, RossellaMAYER, JuergenKELLEY, Sean
    • H04W36/00H04W36/04
    • H04W36/0083H04W36/0061H04W36/04
    • The application relates to intra-LTE handover where a serving eNB triggers handover based on measurement results received from the UE. In conventional approaches, the UE indicates only the physical cell identity PCI and through the reported measurements the carrier frequency of the measured cells. The serving eNB selects a target cell and prepares the target cell to receive a connection with the UE, suitably using an X2 or S1 handover preparation procedure. The serving eNB then commands the UE to connect to the target cell through a RRC connection reconfiguration procedure. However, in case two different candidate target cells share a PCI, the target cell is ambiguous. Therefore, the conventional RRC connection reconfiguration procedure might lead to a handover failure if the other, non-prepared, cell is selected. Therefore, the present application proposes that, rather than waiting for a handover failure, the serving eNB prepares all potential candidate cells (108A & 102A) to which the UE might be handed over and forces the UE (110C) to make an RRC connection re-establishment procedure to a given PCI even without handover failure (206). The UE will likely succeed to access the selected target cell even if its Cell Global Identity is ambiguous and not known by the source eNB. Hence, the application proposes a new message which may be referred to as RRC:ConnectionReestablishmentCommand message.
    • 该应用涉及基于从UE接收的测量结果,服务eNB触发切换的LTE内切换。 在常规方法中,UE仅指示物理小区标识PCI,并且通过报告的测量来指示所测量小区的载波频率。 服务eNB选择目标小区并准备目标小区以接收与UE的连接,适当地使用X2或S1切换准备过程。 服务eNB然后通过RRC连接重新配置过程命令UE连接到目标小区。 然而,如果两个不同的候选目标单元共享PCI,目标单元是不明确的。 因此,如果选择了另一个未准备好的小区,则传统的RRC连接重配置过程可能导致切换失败。 因此,本申请提出,服务eNB不是等待切换失败,而是准备所有潜在候选小区(108A和102A),UE可能被切换到该候选小区(108A和102A),并迫使UE(110C)进行RRC连接 即使没有切换失败,给定PCI的建立过程(206)。 即使其小区全局标识是不明确的,并且源eNB不知道,UE将可能成功地访问所选择的目标小区。 因此,应用程序提出了可以被称为RRC:ConnectionReestablishmentCommand消息的新消息。