The embodiments disclose methods and devices for mobility control of UEs in a HetNet with multiple frequency carriers. In the methods, intra-frequency measurement and inter-frequency measurement are performed sequentially for determining a target cell to handover to.

A method of implicit signaling to support In-Device coexistence interference avoidance is provided. A UE sends an IDC interference indication to an eNB. The indication indicates that a serving frequency becomes unusable due to a coexistence interference problem. The indication does not explicitly indicate a frequency index or a frequency location of the unusable serving frequency. The eNB determines the serving frequency as unusable in an implicit manner. The eNB also determines an implied unusable frequency region based on the received IDC indication. The implied unusable frequency region is between the serving frequency and the ISM band. In one advantageous aspect, the eNB configures a condition for the UE, such that the UE is refrained from sending IDC interference indications unless the condition is satisfied.

A method of implicit signaling to support In-Device coexistence interference avoidance is provided. A UE sends an IDC interference indication to an eNB. The indication indicates that a serving frequency becomes unusable due to a coexistence interference problem. The indication does not explicitly indicate a frequency index or a frequency location of the unusable serving frequency. The eNB determines the serving frequency as unusable in an implicit manner. The eNB also determines an implied unusable frequency region based on the received IDC indication. The implied unusable frequency region is between the serving frequency and the ISM band. In one advantageous aspect, the eNB configures a condition for the UE, such that the UE is refrained from sending IDC interference indications unless the condition is satisfied.

A base station relates to a wireless communication system that performs handover from a cell connected with a terminal to a neighbor cell of the cell. The base station includes: circuitry, which, in operation, sets an offset to be applied to reception quality of the neighbor cell according to a quality of service (QoS) class identifier (QCI) of the terminal when the terminal determines whether to report a measurement result to be used in determination on the handover; and a transmitter, which, in operation, transmits the offset to the terminal.

The present invention relates to a handover method and apparatus in a wireless communication system supporting an eICIC function. A communication method of a first base station in a heterogeneous network wireless communication system, which includes the first base station and a second base station and supports a cell range expansion (CRE) function, comprises the steps of: monitoring whether the cell range expansion function is deactivated; when the deactivation of the cell range expansion function is detected, generating a handover request message; and transmitting the handover request message to the second base station.

Deploying multiple access points on multiple wireless communication channels to optimize coverage area. Additional channels provide additional communication capability which multiple AP's, and their associated stations, can collectively use. An additional set of AP's can be disposed in the additional communication channel, with multiple communication channels possibly physically intersecting. The system control element collects information from devices in the wireless communication system, and automatically configures which AP is assigned to which communication channel. The system control element determines which AP's are servicing which physical locations, in response to feedback from AP's and stations in those locations. The system control element assigns, or re-assigns, AP's in each physical location, with the effect of optimizing coverage.

Deploying multiple access points on multiple wireless communication channels to optimize coverage area. Additional channels provide additional communication capability which multiple AP's, and their associated stations, can collectively use. An additional set of AP's can be disposed in the additional communication channel, with multiple communication channels possibly physically intersecting. The system control element collects information from devices in the wireless communication system, and automatically configures which AP is assigned to which communication channel. The system control element determines which AP's are servicing which physical locations, in response to feedback from AP's and stations in those locations. The system control element assigns, or re-assigns, AP's in each physical location, with the effect of optimizing coverage.

According to one disclosure of the present specification, a method for applying system information changed in a terminal is presented. The method for applying the changed system information includes the steps of: receiving an indicator providing notice of a change of a system information set from a cell; receiving information on the time when the change of system information is applied; when the indicator is received in subframe n, determining that the changed system information is applied after k periods based on the information from the n subframe.

According to one disclosure of the present specification, a method for applying system information changed in a terminal is presented. The method for applying the changed system information includes the steps of: receiving an indicator providing notice of a change of a system information set from a cell; receiving information on the time when the change of system information is applied; when the indicator is received in subframe n, determining that the changed system information is applied after k periods based on the information from the n subframe.

A method that incorporates aspects of the subject disclosure may include, for example, obtaining, by a system comprising a processor, interference information associated with one or more physical resource blocks (PRBs) from each base station of a plurality of base stations. Further, the method can include determining, by the system, from the interference information a strategy for improving a PRB utilization of a first base station of the plurality of base stations. In addition, the method can include conveying, by the system, the strategy to at least one base station of the plurality of base stations. Other embodiments are disclosed.