Method and UE for network attachment

摘要

A method and a user equipment (UE) for network attachment are disclosed. The method includes receiving first status information associated with one or more remote radio units (RRUs) for supporting the small cell from the one or more RRUs, receiving second status information associated with one or more macro cells from one or more macro eNBs for supporting the macro cell, selecting an RRU and macro eNB, which the UE wants to attach, among the one or RRUs based on the first status information and the second status information, and simultaneously transmitting an attach request message for requesting network attachment from the selected RRU and macro eNB to the selected RRU and macro eNB.

主权项

1. A method for network attachment of a user equipment (UE) in a heterogeneous cell environment in which a macro cell and a small cell coexist, the method comprising:
receiving first status information associated with one or more remote radio units (RRUs) for supporting the small cell from the one or more RRUs; receiving second status information associated with one or more macro cells from one or more macro eNBs for supporting the macro cell; selecting an RRU and a macro eNB, which the UE wants to attach, among the one or more RRUs and among the one or more macro eNBs based on the first status information and the second status information; simultaneously transmitting an attach request message to the selected RRU and the selected macro eNB, wherein the attach request message is for requesting network attachment to the selected RRU and the selected macro eNB; receiving a first RRC (Radio Resource Control) connection reconfiguration message for a radio bearer configuration, from the selected RRU and the selected macro eNB; and transmitting an RRC connection reconfiguration complete message, to the selected RRU and the selected macro eNB, when the radio bearer configuration with the selected RRU and the selected macro eNB is completed according to the first RRC connection reconfiguration message, wherein the attach request message transmitted to the selected RRU further comprises information about a macro eNB providing best link quality to the UE among the one or more macro eNBs, and wherein the attach request message transmitted to the selected macro eNB further comprises information about the selected RRU among the one or more RRUs.