Abstract: In a radio access network (24) a femto radio base station (28f) comprises a resident receiver (54) which acquires system information broadcast in a radio access network (24). At least part of the system information is used for building, at the femto radio base station (28f), a neighbor data structure (59) comprising information for neighboring cells. The neighbor data structure (59) is then used for building a neighbor list. The neighbor list is subsequently transmitted from the femto radio base station (28f) to a user equipment unit (30) served by the femto radio base station (28f). In some example embodiments and modes, the femto radio base station (28f) reports the neighbor data structure to a network node (26, 100) other than the femto radio base station. The other node (26, 100) uses the neighbor data structure for building the neighbor list at the other node.

Abstract: A wireless communication system (20) allows for using base station router devices (30, 32) for in building communications using a mobile station (22). Automatically configuring a definition code such as primary scrambling codes or pseudo random noise offsets of the base station router devices (30, 32) facilitates minimizing or avoiding false handovers between a macrocell base station (24) and one of the base station router devices (30, 32). In a disclosed example, a controller (26) such as a radio network controller communicates with at least one of the base station router devices (30, 32) for automatically changing a definition code used by such a device to avoid correspondence between definition codes within a selected range.

Abstract: A method and apparatus configure Femto Devices in an Ultra Mobile Broadband network system. A Femto Device transmits a Femto pilot signal to an Access Terminal, which is served by a plurality of base stations in the Ultra Mobile Broadband network system. The Access Terminal then transmits to the Femto Device an identifier of a base station that controls a macro cell where the Femto Device is located. Next, a Neighbor Discovery Request message is transmitted from the Femto Device to the base station in dependence upon the received identifier of the base station. In response to the Neighbor Discovery Request message received, a Neighbor Discovery Report message is transmitted from the base station to the Femto device. The Neighbor Discovery Report message includes a field indicating network addresses of a Session Reference Network Controller and an Access Gateway that connect to the base station.

Abstract: A method and system for minimizing slot wastage by overlapping HARQ regions in a communication system. A control region allocation (CRA) utility defines a group of HARQ regions for transmission of control data. A HARQ region definition includes a starting symbol and a starting sub-channel number for the HARQ region, a number of symbols and a number of sub-channels to define the dimensions of the region and the slot duration for each sub-burst in a sequence of allocated sub-bursts. The CRA utility overlaps one HARQ region with the other to minimize slot wastage. The slots that carry data in one HARQ region overlap un-used slots in another HARQ region or are overlapped with a dummy allocation in the other HARQ region. Since mobile stations do not carry data for the slots with a dummy allocation, the overlap of HARQ regions avoids conflict with the HARQ operation.

Abstract: A system and method performs real-time subscriber management and accounting for a wireless device by detecting predetermined events within the wireless device and communicating information pertaining to such events from the wireless device to a real-time subscriber management platform in association with each communication session. The information received by the real-time subscriber management platform is used to control the behavior of the wireless device and/or to update accounting information pertaining to the subscriber.

Abstract: High quality communications among a diverse set of cognitive radio (CR) nodes is permitted while minimizing interference to primary and other secondary users by employing Dynamic Spectrum Access (DSA) in a Dynamic Cellular Cognitive System (DCCS). Diverse device types interoperate, cooperate, and communicate with high spectrum efficiency and do not require infrastructure to form the network. The dynamic cellular cognitive system can expand to a wider geographical distribution via linking to existing infrastructure.

Abstract: The present invention concerns a method for determining if a first cell managed by a first base station is neighbour of a second cell managed by a second base station, the cells being cells of wireless cellular network, the wireless cellular network comprising a telecommunication network enabling the transfer of information between the base stations. The first base station monitors the amount of information transferred between the first base station and the second base station through the telecommunication network and determines if the second cell managed by the second base station is neighbour of the first cell managed by the first base station according to the amount of monitored information transferred between the first base station and the second base station through the telecommunication network. The invention concerns also the associated device.

Abstract: A wireless multimedia handset can include one or more of wireless system support, a platform to handset features, and multiple features. The multiple features may include, by way of example but not limitation, multiple-antennae, multimedia storage with advanced search capability, a high fidelity sound system, peer-to-peer networking capability, seamless handoff capability, instant hotspot capability, and ultra low power operation such that the handset is capable of operation without recharging by operating solely on solar cells.

Abstract: The invention is a virtual gateway that mediates between a dual-mode subscriber device and an IP-based PBX. In particular, the virtual gateway includes a WLAN interface for communicating with the dual-mode subscriber device and a network interface (wired or wireless) for communicating with the IP-based PBX over the Internet. As such, the virtual gateway may relay voice and call control instructions between the dual-mode subscriber device and the IP-based PBX, and may provide the same call control functions to the dual-mode subscriber device provided by the call control processor in existing dual-mode phones. The invention further provides a dual-mode subscriber device suitable for operation with the virtual gateway. Because the dual-mode subscriber device does not require a call control processor, the battery life and cost of the device are significantly improved.

Abstract: A wireless network including a plurality of base stations operating at a public spectrum frequency, each base station capable of generating an adjustable size coverage area. Each base station utilizes dedicating channels for each user to permit avoidance of one or more sources of interference. A server supplies data to the base stations, and managing billing and access to the wireless network. A plurality of base stations employs transmissions in the unlicensed spectrum (i.e. 3.6 and 5.7 GHz in the US) for permitting flexibility in transmission power and additional subchannel/subcarrier interleaving capability for mitigating interference.

Abstract: A wireless communication device and method includes selecting a group of neighboring base stations having a relatively stronger signal intensity among the neighboring base stations as servo base stations, and periodically detecting the signal intensities of the servo base stations and the candidate base station. Differences between the signal intensities of two selected neighboring base stations for each cycle of a continuous cycles are accumulated, where when the accumulated value exceeds a threshold value in a each cycle, the group of servo base stations are updated and weakest servo base stations with the strongest candidate base station in that cycle are replaced.

Abstract: A communication method of a macro base station serving a target mobile terminal in a macrocell including a picocell includes receiving information about an uplink interference of a pico base station in the picocell from the pico base station, and determining whether to perform a handover of the target mobile terminal to the pico base station based on an uplink interference of the macro base station and an uplink interference of the pico base station.

Abstract: The present invention concerns a method for determining neighboring condition and cell area operation of a cell area managed by a base station, the cell area being a cell area of a wireless cellular network, the wireless cellular network comprising a telecommunication network enabling the transfer of information between a first base station and a second base station, wherein the wireless cellular network comprises a server linked to the telecommunication network. The first base station configures an operation domain of a first cell area managed by the first base station based on the information representative of the operation domain of the second cell area received from the second base station via the direct connection. The invention concerns also the associated non-transitory computer readable storage medium including stored thereon a computer program for implementing a method for determining cell area operation of a cell area managed by a base station.

Abstract: Overlaying a Wireless Macro Cell architecture on a Micro Cell network. WLAN MAC Address Translation (WMAT) is used to translate BSSIDs from the BSSID used to initialize a radio in an access node and identify communications between the radio in the access node and a controller, and the BSSID used over the air for Macro Cell operation. WMAT is used for transmit operations, translating the BSSID of outgoing packets to the Macro Cell BSSID prior to wireless transmission. On the receive side, packets undergo WMAT and transmission to the controller if the STN MAC address of the sender is in an ACK table associated with the radio, or the packet is one of a predetermined type. The ACK table is managed by transmit operations, and by control commands from the controller.

Abstract: System(s) and method(s) are provided to survey a confined area serviced by femto cell for power calibration. Building survey facilitates calibration of femto cell power to suit actual coverage conditions within the building. A femto access point (AP) is set to “calibration mode” while a “calibration call” is effected (e.g., by a subscriber) throughout the intended in-building coverage area. Wireless signal strength for macro and femto coverage is measured and employed to establish an optimal femto AP power. Building survey for power calibration affects operation of the both a building-based AP serving the femto cell and wireless devices, and enhances subscriber experience.

Abstract: A method for reducing a delay in a wireless communications system resulting from a handoff while mitigating a risk of premature termination of wireless communications, the method includes comparing data indicative of actual use of the wireless communications systems to at least one predetermined criteria. If the comparing determines a sector pairing in the wireless communications system to be statistically significant for purposes of recommending at least one search window setting, at least one value related with a distance associated with the sector pairing may be used to automatically determine a corresponding signal delay. If the corresponding signal delay exceeds a prior determined signal delay, a recommended search window setting may be determined using the corresponding signal delay.

Abstract: In a mobile radio network in which synchronous base stations and asynchronous base stations coexist, according to handover destination base station candidate information transmitted from a base station to a mobile station, effective time information indicating either an effective time during which it is guaranteed that a signal from a base station candidate included in the handover destination base station candidate information can be detected when, after a lapse of an integral multiple of a fixed time interval from a time when the mobile station could detect a reference signal which were transmitted at the fixed time intervals from the base station candidate, the mobile station detects the same base station candidate again, the effective time depending on the base station candidate, or an index for enabling the mobile station to drive the effective time is provided to the mobile station, and the mobile station carries out the detection by setting up the detection time intervals at which the mobile station de

Abstract: One object of the present invention is to improve stability of wireless communication, regardless of a movement speed of a mobile station by estimating a movement speed of a mobile station using a signal prepared in advance for a used standard and selecting an appropriate base station. In the wireless communication system 100 according to the present invention, in order to adjust a timing of receiving data from the PHS terminal 110 to a desired timing, base stations 120, 122 transmit an adjustment signal for advancing or delaying data transmission timing in the PHS terminal 110. Thus, the PHS terminal 110 calculates a bias amount of such an adjustment signal to determine high speed movement of the PHS terminal 110 and perform handover from a micro cell base station 120 to a macro cell base station 122.

Abstract: Methods and apparatus for triggering roaming in a mobile network device are disclosed. A speed of the network device is detected. One or more maximum/minimum trigger values corresponding to one or more trigger events are ascertained at the speed of the network device. One or more trigger counters associated with the one or more trigger events are maintained. Roaming of the network device is triggered when one of the trigger counters associated with one of the trigger events is equal to or exceeds (or is less than or equal to) one of the trigger values corresponding to the trigger event at the speed of the network device.

Abstract: The present invention enables provision of a service in which a distribution method of content is changed depending on a location of a mobile station. Specifically, if a user of mobile station MS is located in a country where the usage of content is not permitted, content server CS detains the content temporarily, and after confirming that the user has moved to a country where the usage of the content is permitted, sends the detained content to mobile station MS of the user. When detaining the content, content server CS checks whether an expected date of the user moving to a country where the usage of the content is permitted is within a distribution period of the content, and if so, detains the content.

Abstract: In a multiple-access network, network access terminals conduct peer-to-peer communications on reverse link channels of the network.

Abstract: Several embodiments of an IMS communications network are disclosed. In one embodiment, the network comprises a plurality of dispatch application servers (DAS), an S-CSCF, and an event notification server. The S-CSCF is adapted to receive an IMS registration request from a dispatch client, authenticate the registration request, send a registration confirmation to the dispatch client, and send a notification indicating the registration of the dispatch client to an event notification server. The event notification server is adapted to receive the notification from the S-CSCF, select a DAS, and send a notification to the selected DAS indicating an assignment to provide dispatch service to the dispatch client. In another embodiment, the registration notification to the event notification server is sent from the dispatch client, instead of the S-CSCF.

Abstract: A method includes a first step of monitoring a noise floor. A next step includes determining if the noise floor crosses a threshold level. A next step includes preventing any further increases in a Common Pilot Channel power level. A next step includes randomly selecting and performing an interference mitigation measure. A next step includes monitoring an interference level. A next step allows further increases in a Common Pilot Channel power level if the interference abates by more than a predetermined amount.

Abstract: A wireless communication device and method for making a secure transfer of a communication connection from a direct connection with a cellular network to a connection via a wireless local area network is provided. The device and method are adapted for detecting the presence of the wireless communication device within the communication coverage area of the wireless local area network and authenticating the wireless communication device with the wireless local area network. After authenticating the wireless communication device with the wireless local area network, a handoff is requested from the cellular network to the wireless local area network, where a secure connection between the mobile station and the cellular network via the wireless local area network is established, and then the direct connection with the cellular network is broken.

Abstract: A drifting wireless transmit/receive unit (WTRU) has an associated drift radio network controller (D-RNC) and an associated servicing radio network controller (S-RNC). The D-RNC sends a request message to the S-RNC requesting measurements of the drifting WTRU. The S-RNC receives the request message and sends an information message with the requested measurements to the D-RNC. The D-RNC receives the information message.

Abstract: Techniques for using measurements made by UEs to improve network performance are described. In one aspect, RF parameters of cells may be determined by taking into account mobility of the UEs. Mobility information for the UEs may be determined based on measurement report messages (MRMs) sent by these UEs for handover. RF parameters such as antenna down-tilt, antenna orientation, antenna pattern, and/or pilot power of the cells may be determined based on the mobility information for the UEs. In another aspect, the RF parameters of cells may be dynamically adjusted based on loading conditions of cells. In yet another aspect, the location of a UE may be determined based on an MRM sent by the UE for handover. The MRM may include timing measurements for multiple cells. The location of the UE may be determined based on the timing measurements.

Abstract: Disclosed herein is a method and apparatus for maintaining communication between a dependent and a communications network when the dependent is outside a coverage area associated with its master using a controller and a communications network. In one embodiment, when the dependent is in a piconet, the dependent is within communication range of its master using a communication channel on frequency band fband(1). When the dependent moves outside the piconet, the dependent should be within communication range of the controller and, thus, switches to another communication channel within frequency band fband(1) such that it may communicate with the controller. When the dependent moves outside the communication range of the controller, the dependent should be within communication range of a communications network or a base station and, thus, switches to a communication channel within another frequency band fband(2).

Abstract: Methods and systems for reconfiguring communications systems are provided. In one embodiment, a radio head interface for a communications system comprises: a first interface for communicating with a signal processing module digitally performing waveform processing to modulate and demodulate radio signals; a second interface for communicating with a radio head for transmitting and receiving wireless radio signals; a first buffer coupled to the first interface for receiving a page of data from the signal processing module, the page of data comprising a page header for communicating reconfiguration parameters and a plurality of digital radio frequency samples representing a modulated radio signal; at least one digital frequency converter coupled to the second interface; and a configuration management unit, the configuration management unit adapted to receive the reconfiguration parameters from the page header and reconfigure the at least one digital frequency converter based on the reconfiguration parameters.

Abstract: A mobile communication device is adapted to provide voice communications with use of a voice service and data communications with use of a data service. The mobile device maintains a preferred network list as well as a service access list in its memory. The preferred network list has a listing of a plurality of networks with assigned priorities for network selection. The service access list has a listing of a plurality of networks that make the data service available to the mobile device. The mobile device performs a scanning operation for identifying one or more communication networks available in a coverage area of the mobile device. When a home network of the mobile device is unavailable in the coverage area, the mobile device consults the preferred network list and the service access list for identifying one of the networks identified by the scanning operation.

Abstract: A system and a method for connecting macro cellular base stations into mini type base stations are applicable to a mobile communication apparatus having a covering range provided by macro cell base stations upon entering into a range provided by mini type base stations for automatic switching. The method includes establishing a database stored with information related to a geographic distribution for mini type base stations and a listing of authorized admission for allowing mobile communication apparatus to enter; acquiring the geographic area of the mobile communication equipment in order to search the database for at least one mini type base station based on International Mobile Subscriber Identity of the mobile communication apparatus for allowing the mobile communication apparatus to enter into the searched mini type base station from the macro cell base stations for communication.

Abstract: A method for operating a femtocell in a wireless communication system comprises the steps of: triggering the switching from the operation mode for providing a service to closed subscriber group (CSG) terminals which belong to a specific terminal group and to non-CSG terminals which do not belong to the specific terminal group, to the operation mode for providing the service only to said CSG terminals; and commanding said non-CSG terminals to change the operation mode, and carrying out a handover. The method of the present invention improves efficiency of femtocell operation, and reduces restrictions on terminals disposed in the vicinity of the femtocell. The method of the present invention can utilize the unused frequency range of the femtocell, thereby providing a service with a high data ratio.

Abstract: There is described a method of controlling a basestation in a cellular wireless communications network, the method comprising, within the basestation, autonomously and dynamically adapting a maximum value for a total transmit power of the basestation, such that interference between the basestation and other access points in the vicinity is minimized.

Abstract: A system and method for delivering coupon messages to a consumer wireless device utilizes a fixed communication device that functions as a base station for the consumer wireless device. The fixed communication device has limited coverage zone. When the consumer wireless device comes within the coverage zone of the fixed communication device, the consumer wireless device selects the fixed communication device as the preferred base station. Upon completion of registration, the fixed communication device transmits one or more coupon messages to the consumer wireless device. The consumer may enter the associated retail establishment and complete a transaction using the received coupon message. The consumer wireless device may be viewed manually, or the display scanned or read electronically to accept the coupon message in the retail establishment.

Abstract: A cellular communication system is provided. According to one embodiment, the communication system includes at least one cell. The at least one cell is defined by a coverage layer defining a coverage of the at least one cell and a capacity layer at least partly defining a capacity of the at least one cell.

Abstract: This disclosure concerns methods and systems for network communications. In one example of such a method, respective groups of cells are first allocated to respective location regions. Next, respective indicators are received from various devices, indicating the identity of the cell occupied by the corresponding device. Additionally, a database is maintained that includes information concerning the location region occupied by each device. In operation, when a device switches from a radio access network to another access network, the other access network receives the indicator of the identity of the cell occupied by the device and, in dependence thereon, selects the location region which the device is deemed to occupy by a core network.

Abstract: A vertical handover method in a heterogeneous overlay network communication system is provided. A vertical handover method for an overlay communication system including a plurality of base stations each serving at least one communication network technology to a mobile terminal includes determining whether a mobile terminal is located in a measurement region with reference to a vertical handover map in relation to a serving base station; detecting reachable base stations by activating all network interfaces when the mobile terminal locates in a measurement region; selecting one of the reachable base stations as a handover target base station; determining if the mobile terminal is located in a handover region with reference to the vertical handover map; and performing a handover if the mobile terminal is located in a handover region.

Abstract: A system and method for providing communications within an airfield between an aircraft component located upon an aircraft and an airport data network. A control computer is used to select an optimal antenna substation from a plurality of antenna substations disposed about the airfield for the aircraft component to communicate with. The selection is based in part upon position information including the directional heading of the aircraft, determined using a suitable position detecting system, such as a Global Positioning System or a multi-lateration system, and in part upon the loading (i.e., RF traffic) being experienced by each antenna array.

Abstract: While dividing a limited number of physical-layer cell identities (PCIDs) into a group of PCIDs to be added to macro-cell base stations and another group of PCIDs added to femtocell base stations, a center machine associating with a femtocell base station that applies for PCID addition refers to a table storing therein area information of a plurality of macrocell base stations and femtocell base stations within a wireless communication system to thereby identify the area of a message-transmitted femtocell base station and PCIDs being presently used in this area, selects an unused PCID in this area, and assigns it to the PCID addition-requesting femtocell base station. With such arrangement, while maximally leveraging the limited number of PCIDs in the wireless communication system, PCID setup is automatically performed in such a way as to prevent the PCID from becoming the same as a PCID of its neighboring base station.

Abstract: A network architecture for Wireless Intranet Office (WIO) applications including a local radio network such as a wireless local area network (WLAN) which comprises a Wireless Mobile Center (WMC) arranged to serve as a WLAN access point; a GSM network which comprises a Mobile Station (MS) in a form of a dual-mode cellular phone to access both WLAN and GSM radio technologies, a Base Station (BS) arranged to convert a radio signal from the Mobile Station (MS) for communication, a Mobile Switching Center (MSC) arranged to establish call connection; and a Handover Module implemented in either the Mobile Station (MS) or the Wireless Mobile Center (WMC) for providing seamless mobility between the GSM network and the wireless LAN, when the Mobile Station (MS) roams between the GSM network and the wireless LAN.

Abstract: Provided is a method for receiving a notification indicating a completion of a network re-entry procedure by a Base Station (BS) in a communication system. The method includes transmitting, to a Mobile Station (MS), a RaNGing ReSPonse (RNG-RSP) message including information indicating whether to omit any of processes or transmission of messages for performing a network re-entry procedure with the BS; and receiving, from the MS, a notification indicating the completion of the network re-entry procedure.

Abstract: A system and method for wireless network connection switching management is shown. The system notifies a mobile user that his portable terminal is within an area where it can be provided with local fast wireless communication service such as a hot-spot service versus using a low speed, but wide coverage wireless access network. Radio waves for communication transmitted by a mobile wireless terminal are received at a WWAN receiving system provided in a WLAN system. The radio waves are capable of communicating with a WWAN (Wireless Wide Area Network) system utilizing a third generation mobile phone network and a WLAN (Wireless Local Area Network) system providing a hot-spot service. Instructions are output to the terminal via the Internet and a base station of the WWAN system that the mobile terminal is within an AP service area of an access point of the WLAN system. The user may choose to switch wireless network access networks in order to achieve faster access to the Internet.

Abstract: Method for supporting network based mobility for a mobile terminal in an IMS (IP Multimedia Subsystem) architecture, wherein the mobile terminal is connected to a femto cell or to a macro cell—source cell—and wherein handover of an actual session of the mobile terminal is performed to another femto cell or macro cell—target cell—, wherein the femto cells and the macro cells are provided with an eMSC-server (Mobile Switching Center Server enhanced for IMS Centralized Services) function, and wherein the source cell's eMSC-server function hosts a source user agent and the target cell's eMSC-server function hosts a target user agent, is characterized in that the source user agent contacts the target user agent directly or indirectly prior to executing the actual handover, and wherein the source user agent prepares the target user agent together with the corresponding access network by exchanging handover related information.

Abstract: A multi-mode mobile station includes a first interface for wireless communication with a wireless local area network (WLAN) and a second interface for wireless communication with a wireless wide area network (WWAN). A call control system routes all calls to and from the multi-mode mobile station through a media gateway that serves as an anchor point for handoffs between the WLAN and WWAN. For example, while involved in a call that has a WLAN call leg from the media gateway, the multi-mode mobile transmits a handoff request. The call control system then establishes a WWAN call leg from the media gateway, and the multi-mode mobile station stores in a buffer any media received via the WWAN call leg. The call control system subsequently transmits a handoff instruction to the multi-mode mobile station. In response, the multi-mode mobile station plays out the stored media and drops the WLAN call leg.

Abstract: While a mobile node is engaged in a communication session via a first air interface channel, the user of the mobile node requests a vertical handoff. In response to the user's handoff request, the mobile node goes into a dormant mode to release the first air interface channel. The mobile node then acquires a second air interface channel, which may have a higher data rate than the first air interface channel, and continues the communication session via the second air interface channel. The mobile node may also determine that a vertical handoff may be available, e.g., by checking a preferred roaming list (PRL), and then indicate to the user that a vertical handoff may be available.

Abstract: In an in-building wireless communications network, a weighted sum of a downlink signal from two relevant base station interfaces (BSIs) is transmitted by a radio transceiver transitioning between two sectors. During a transition period, the weight of the combined downlink signal is adjusted gradually to simulate a smooth shift in the coverage of the sectors and transition the radio transceiver from a first sector to a second sector. This allows a base station to hand over users from a first sector to a second sector while suppressing any disruption in service.

Abstract: A method and apparatus are provided to allow a mobile communications device to identify and store the locations of femtocells which are not contained on a preferred femtocell list of the mobile communications device. Upon identifying a specific femtocell, an authorized mobile communications device may register with the specific femtocell to initiate and receive calls. Furthermore, the present invention allows the mobile communications device to employ the stored location information to automatically identify the specific femtocell whenever the mobile communications device is in a vicinity of the specific femtocell.

Abstract: A method, system, and medium are provided for increasing the robustness of communications sessions between mobile devices and communications networks through handoff diversity. Separating the handoff times through handoff diversity provides for continuous transmission of data and decreases the likelihood of dropped calls and lost data. In a communications session capable of communicating data through multiple channels, handoff diversity is implemented by ensuring that at least one communication channel's handoff is complete and transferring data prior to initiating a handoff within another channel. In one illustrative embodiment, the present invention configures the physical propagation environment of the channels to create diversity in channel-handoff occurrences. In another illustrative embodiment, the communications network or mobile device is configured to force channel-handoff diversity by delaying a handoff for one or more communication channels.

Abstract: A mobile station includes a radio channel condition evaluation unit evaluating a radio channel condition; a radio channel condition averaging unit averaging the evaluated radio channel condition over a predefined time period; a radio channel condition threshold storage unit storing a threshold of the radio channel condition and a message type, the threshold and the message type being specified by a radio access network apparatus; a radio channel condition comparison unit comparing the averaged radio channel condition with the threshold; and a radio channel condition reporting unit transmitting an identifier and the radio channel condition for a cell to the radio access network apparatus, the averaged radio channel condition of the cell being greater than or equal to the threshold.

Abstract: Provided is a method of controlling a transmit power of a control channel transmitted from a pico base station. The pico base station may control the transmit power of the control channel based on a position of a macro terminal adjacent to the pico base station. When the macro terminal is positioned within a coverage of the pico base station, the pico base station enables the macro terminal to receive a control signal without interference from the macro base station by decreasing the transmit power of the control channel.

Abstract: Disclosed is the retransmission control method used in a mobile communication system including mobile terminals (MTs), base stations (BSs) and the radio network controller (RNC) which controls the BSs. When an MT detects data error, it sends the 1st negative acknowledgement (NACK) to the BS. This first NACK includes a cell ID which indicates the cell where the reception data is transmitted. When cell ID in this 1st NACK includes cell ID of a cell besides the cell which the BS itself manages, the BS sends the 2nd NACK to the RNC. This 2nd NACK includes the cell ID and the data number to specify the data in which the mobile terminal detected the data error. The RNC decides the BS where data is to be retransmitted based on the cell IDs in the 2nd NACK and sends data retransmission request to the decided BS.