45 results about "Hierarchical cell structure" patented technology

A method for mitigating interference at a small base station in a hierarchical cell structure is provided. In the method, the small base station checks a sub-frame allocated to macro user equipment by using a downlink signal received from a macro base station when an interference candidate user equipment list is received. The interference candidate user equipment list contains information on the macro user equipment adjacent to a femto cell controlled by the small base station. Then the small base station allocates other sub-frame to femto user equipment located in the femto cell by avoiding the sub-frame allocated to the macro user equipment.

A method of transmitting data for reducing interference in a hierarchical cell structure including a macro base station (BS) providing multi carriers and a femto BS providing a single carrier includes performing a channel scan within an interfered carrier to acquire channel state information and neighbor femto BS information if interference with the femto BS occurs; transmitting a channel measurement report including the channel state information and the neighbor femto BS information to the macro BS; and transmitting data through a carrier changed by receiving carrier change information from the macro BS.

A method and an apparatus for interworking between base stations using a GateWay (GW) in a wireless communication system of a hierarchical cell structure are provided. In the method, a message requesting Internet Protocol (IP) information of a target eNB is received from a source eNB. The IP information of the target eNB is obtained. The source eNB is mapped to the target eNB and the mapping is stored. IP information of the GW is transmitted to the source eNB instead of the IP of the target eNB.

Disclosed is a method and apparatus for cell selection, which can prevent the occurrence of an error in the cell selection in a mobile communication system supporting the hierarchical cell structure. The method includes: when the number of times of cell reselection during a cell reselection time period given to a particular User Equipment (UE) located within a micro cell exceeds a predetermined maximum number of times, determining if a sum of actual occupancy time intervals of the particular UE in Node Bs, services of which the particular UE has used up to then, is smaller than a predetermined value; and when the sum of actual occupancy time intervals of the particular UE in Node Bs, services of which the particular UE has used up to then, is smaller than the predetermined value, determining that the UE is in a low speed state and maintaining the micro cell as a service cell for the UE.

The invention discloses a method and controller for balancing load among cells of a multiband time division-synchronous code division multiple access (TD-SCDMA) system. The method comprises the following steps: acquiring a balanced candidate cell list according to an intrasystem cell adjacent to a cell in which a terminal is currently stayed; determining the actual frequency band priority level, hierarchical cell structure (HCS) priority level and load priority level of each cell; acquiring the total priority level weight of each cell; sequencing all the cells in the intrasystem balanced candidate cell list; and enabling each cell to carry out an acceptance operation. The controller comprises an intrasystem balanced candidate cell list acquisition module, a priority level determination module connected with the intrasystem balanced candidate cell list acquisition module, a total priority level weight determination module connected with the priority level determination module, a cell sequencing module connected with the total priority level weight determination module and an acceptance module connected with the cell sequencing module, thus the invention ensures that the purpose of balancing load among cells which are in different frequency bands and have different HCS layers is realized.

An apparatus and a method manage power of a small base station. Whether a notify message indicating that a subscribed terminal enters a macro base station that includes an off-small base station is received from the macro base station under a closed access mode is determined. When the notify message is received, whether a service is providable to the subscribed terminal is determined. When the service is providable to the subscribed terminal, the small base station is turned on. During the closed access mode or when a load of a macro cell is large during an open access mode, when a terminal that should be serviced does not exist in the neighborhood of a small base station, an interference and power consumption unnecessarily generated may be reduced by turning off the small base station.

The invention relates to a wireless communication system and discloses a cell selection method and equipment inside a layered cell structure to ensure that terminals can be more reasonably distributed inside layered cells of different levels. Through taking the duration of a DRX cycle as one of the factors selected within an HCS cell, the invention can more reasonably distribute each terminal in each layer of cells of the HCS. When other factors are not changed, a cell with larger coverage area is selected for a terminal with longer DRX cycle. According to the DRX cycle, cell selecting function can be realized inside network side equipment or a terminal. If the moving speed of a terminal is known, the DRX cycle and the speed of the terminal can be combined and are used as one of the factors selected inside the HCS cell.

A method for providing a multicast service from a macrocell or a microcell to a mobile station in a mobile communication system having a hierarchical cell structure in which a given area is divided into at least one macrocell and at least one microcell overlapping with each other. The mobile station receives a multicast service by accessing the macrocell or the microcell according to a carrier-to-interference ratio (C/I) for the multicast service measured in a macrocell area and according to an existence or non-existence of a concurrent call currently in service. When there is no concurrent call currently in service, the mobile station receives the multicast service by accessing the macrocell in an area where the measured C/I is equal to or greater than a required C/I. However, when there is a concurrent call currently in service, the mobile station receives the multicast service by accessing the macrocell or the microcell based on the current cell and the C/I.

A mobile communications system includes a plurality of cell segments each allocated primary carriers to carry circuit-switched traffic and packet data carriers for carrying packet-switched traffic. The packet data carriers include two sets of carriers, a main set of carriers (F1, F2, or F3) and a secondary set of carriers (F4, F5, and F6). The main packet data carriers (F1, F2, and F3) are allocated to corresponding cell segments. The secondary carriers (F4, F5, and F6) are allocated to high capacity segments, which may be segments having high bursty traffic or segments in which a hierarchical cell structure is implemented. For high bursty cell segments, the main carriers (F1, F2, and F3) are used to carry control signaling for performing selection or reselection. However, in such high bursty cell segments, the secondary carriers (F4, F5, and F6) are not used for performing cell segment selection or reselection.

A mobile communication capable of re-selecting a cell in accordance with a residual amount of a battery so that the number of times of re-selecting a cell is reduced in accordance with the residual amount of the battery is provided. Information on a plurality of cells having different priorities in a hierarchical cell structure (HCS) is received and a cell measuring reference is re-set in accordance with the received cell information or the residual amount of the battery so that the mobile communication terminal is connected to a cell selected among the cells measured in accordance with the re-set measuring reference. A cell is re-selected in accordance with information received from the connected cell or cells adjacent to the connected cell and a cell measuring reference is re-set so that cells of low priorities are measured in accordance with the residual amount of the battery. Therefore, it is possible to reduce the number of times of re-selecting a cell and to thus reduce the residual amount of the battery.