Abstract: A system and method for synchronous spectrum sharing for use in a wireless communication system based on orthogonal frequency-division multiplexing (OFDM) or orthogonal frequency division multiple access (OFDMA) signaling is disclosed. The system includes a frame detector configured to detect a frame of a broadcast waveform and extract idle spectrum information for the frame to the secondary user node. The system allows transmitting data from the secondary user node in unused symbol slots identified in the idle spectrum information thereby making efficient use of unused or idle spectrum. Accordingly, secondary users of the wireless communication system can dynamically form ad-hoc mesh network communications in fixed or mobile scenarios.

Abstract: In a radio communication system (1), a lower-level station (10a) has: a lower-level station ID detection unit (13) which detects a lower-level station ID for identifying another lower-level station (10b), from a signal from the other lower-level station (10b); a group ID detection unit (12) which identifies a group ID for identifying a group to which the other lower-level station (10b) belongs; a measurement unit (15) which measures a channel utilization state of the other lower-level station (10b); a utilization probability update unit (19) which calculates a channel utilization amount for each lower-level station and a channel utilization amount for each group based on the lower-level station ID, group ID and channel utilization state, and updates a channel utilization probability which indicates the utilization probability of communication channels based on the channel utilization amount for each lower-level station and the channel utilization amount for each group; and a channel determination unit (20) wh

Abstract: A method and system automatically activates a mobile station in a wireless communications network. The system includes an over the air activation function (OTAF) processor in the network that initiates an activation process in response to receiving a registration message from a mobile switching center serving the mobile station requesting the activation. Each mobile station has a unit of information stored into it at the time of its manufacture to enable it to request over the air activation. That unit of information is either the network routing address of the OTAF processor, or alternately, it is a value that is translatable into that address, either an OTAF ID number that is the same value for every mobile station or it is a sequentially serialized dummy value for the mobile identification number (a dummy MIN).

Abstract: A radio communication system 1 includes a pico-cell base station PeNB in stalled in a communication area of a macro-cell base station MeNB, having lower transmission power than the macro-cell base station MeNB, and expanded in its coverage. The macro-cell base station MeNB determines a degree of expanding the coverage of the pico-cell base station PeNB, according to an amount of usable PDSCH resources of the macro-cell base station MeNB.

Abstract: A scheme that enables seamless roaming between the WLAN and the cellular carrier network by enabling a user that originates a call in the WLAN and happens to go outside the range of the WLAN to automatically switch over to the cellular carrier network without losing connection with the other party. This solution assumes that the mobile device has the capability to operate in at least two modes that include the WLAN mode and one of the cellular carrier modes, such as the GSM, IS-95 CDMA, IS-136 TDMA, and iDEN.

Abstract: Various embodiments are described to enable multiple, independent communication networks to share in an autonomous and dynamic manner unlicensed wireless resources. Generally, this involves determining that a first network node (122) is using at least a portion of a wireless resource to provide network service to at least one remote unit (102). A second network node (123), under the control of a different network operator than the first node and desiring to use the wireless resource, sends the first network node, a request to relinquish use of at least a portion of the wireless resource. The second network node sends this request wirelessly, perhaps using the wireless resource itself. If the first network node grants the request, the second node may then begin using at least a portion of the relinquished resource to provide network service.

Abstract: An apparatus including at least one processor and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to at least evaluate, in a cognitive node, transmission of a physical random access channel in an uplink of a communications carrier, and, based on the evaluating, utilize an interference-free guard time period of a cellular user terminal's transmission in the physical random access channel, for distributing a synchronization signal and a beacon signal locally, the cellular user terminal's transmission in the physical random access channel including a guard time period that compensates a maximum round trip delay in a cell.

Abstract: The invention can provide a movable wireless network that is capable of operating in a multiple network environment. The movable wireless network has a coverage area and includes a detector that detects a network event when the coverage area of the movable wireless network overlaps with a coverage area of another wireless network. The invention can further include a controller that changes an operational state of the movable wireless network when the detector detects the network event so that the movable wireless network is able to operate within the coverage area of the other wireless network.

Abstract: Systems and methodologies are described that facilitate dynamically forming clusters in a wireless communication environment. A set of non-overlapping clusters can be formed dynamically over time and in a distributed manner. Each of the clusters can include a set of base stations and a set of mobile devices. The clusters can be yielded based upon a set of local strategies selected by base stations across the network converged upon through message passing. For example, each base station can select a particular local strategy as a function of time based upon network-wide utility estimates respectively conditioned upon implementation of the particular local strategy and disparate possible local strategies that can cover the corresponding base station. Moreover, operation within each of the clusters can be coordinated.

Abstract: A system and method are provided for creating a picocell service alternate to a wireless network service. The method comprises: detecting a multiple access (MA) wireless communications network, such as a terrestrial or satellite network; and, generating a first picocell in a response to detecting the MA wireless network. Typically, the method comprises receiving requests for picocell service from mobile stations, in response to generating the first picocell. In one aspect, the service requests made by the mobile stations are denied. In another aspect, the method further comprises: establishing a first picocell MSC; and, providing network services to mobile stations via the first picocell, in response to the requests for picocell service. For example, the first picocell MSC may provide the same network services that are provided by a conventional terrestrial network, for example. Alternately, the method establishes an alternative wireless network (a second picocell) to provide services.

Abstract: Communication carried out over a frequency band divided into a plurality of subcarriers by messages transmitted between a first radio station and a second radio station in a plurality of hops between respectively adjacent radio stations arranged in hierarchical levels. A subset of the subcarriers is used for each hop. The subsets used are allocated by at least one higher level radio station and the composition of at least one of the subsets used varies over time.

Abstract: Particular embodiments provide an access gateway that facilitates communication between a plurality of access technologies. The access gateway facilitates data communication with an access terminal through a bearer path. A radio resource manager is configured to provide radio resource management functions for the communications. The radio resource manager is decoupled from the bearer path and provides control of radio transmission characteristics for the bearer path to the gateway. Because the radio resource manager is not in the bearer path, the access gateway may be access technology agnostic. Thus, the access gateway does not need to have access-specific modules based on the radio technology for each bearer path.

Abstract: For restrictive reuse, each cell (or each sector) is assigned (1) a set of usable subbands that may be allocated to users in the cell and (2) a set of forbidden subbands that is not used. The usable and forbidden sets for each cell are orthogonal to one other. The usable set for each cell also overlaps the forbidden set for each neighboring cell. A user u in a cell x may be allocated subbands in the usable set for that cell. If user u observes/causes high level of interference from/to a neighboring cell y, then user u may be allocated subbands from a “restricted” set containing subbands included in both the usable set for cell x and the forbidden set for cell y. User u would then observe/cause no interference from/to cell y. The subband restriction may be extended to avoid interference from multiple neighboring cells.

Abstract: The illustrative embodiments described herein are directed to a method and apparatus for managing frequencies used by devices. In one embodiment, the process detects a set of frequencies from a set of devices to form a set of assigned frequencies. The process may also detect a first frequency used by a first device. The process may determine whether the first frequency interferes with the set of assigned frequencies. The process may also identify an unassigned frequency for use by the first device in response to determining whether the first frequency interferes with the set of assigned frequencies.

Abstract: In accordance with the principles of the present invention utilizing the BLUETOOTH specification Cordless Telephony profile, incoming calls to a cell phone including a Gateway role can be routed to another piconet device (e.g., another cell phone including a Terminal role. Two cell phones with BLUETOOTH capability each include the Cordless Telephony Profile. The cell phone receiving the call acts as a PSTN cordless telephone Gateway cell phone via the cellular network, while the other cell phone acts as a cordless telephone Terminal cell phone. The cordless telephone Terminal cell phone then acts as an extension to the Gateway cell phone allowing both calls to the Gateway cell phone to be answered at the Terminal cell phone, and even allowing calls by the Gateway cell phone to be originated by the Terminal cell phone.

Abstract: A method, apparatus and computer program product are provided for supplying information regarding a neighbor cell following cell reselection in a manner that reduces the signaling load on the network and conserves battery consumption by a mobile terminal. In this regard, the method, apparatus and computer program product do not blindly provide information regarding a neighbor cell that the current cell has already collected, but, instead, first determines if the neighbor information regarding a prior cell is different than and therefore will add to the information regarding neighbor cells that is already maintained by the current cell. Only after making such a determination may a mobile terminal signal the current cell as to the availability of neighbor information regarding a prior cell.

Abstract: A system that selects an optimum codec flexibly adapting to a change in the communication environment and to switch to the optimum codec during communication. A communication control system includes a handover detection unit detecting a handover in which a communication terminal present in a communication area formed by a BTS moves from the communication area to a communication area formed by another BTS, an information acquisition unit acquiring, if the handover detection unit detects a handover, information based on the handover for use in codec switching, a codec selecting unit selecting a codec after switching based on the information acquired by the information acquisition unit, and a codec switching unit controlling such that the codec after switching that is selected by the codec selecting unit is applied to the communication currently performed.

Abstract: An object of the invention is to provide a wireless communication system in which the load of each cell and interference between cells are taken into account. In a handover-candidate base station and a handover-source base station, parameters for interference-reducing scheduling and handover facilitating processing are adjusted based on the mutual load information. When the handover-candidate base station, to be used for load balancing, is a large-diameter cell, transmit power control and frequency scheduling are adjusted by taking account of the load state at a cell edge. When the handover-source base station has a small-diameter cell, the number of terminals to be handed over is adjusted by taking account of the load state of the handover-candidate base station. Thus, both of interference control and load balancing are achieved.

Abstract: A method, and corresponding system, for locating mobile communication terminals associated with a mobile radio network covering a geographical area. Antenna probabilities for a plurality of sub-areas of the geographical area are determined and stored, and locations of mobile communication terminals are estimated based on antennas used by the mobile communication terminals and the antenna probabilities for the sub-areas. The antenna probabilities are determined based on expected field strength. In this regard, the antenna probabilities indicate for at least some of the antennas the probability that in a respective sub-area the field strength of the corresponding antenna is higher than the field strength of other antennas, and the antenna probabilities indicate the probability that the mobile communication terminal, located in the respective sub-area, uses the corresponding antenna for at least one of registering or communicating with the mobile radio network.

Abstract: In a system including one or more femtocells within a service area of a macrocell, a method includes: (a) receiving from a base station information regarding available resources at each femtocell; (b) measuring a signal-interference-to-noise ratio (SINR) at a mobile station relative to the macrocell and each femtocell; and (c) selecting for the mobile station one of the femtocells for a hand-off, wherein the femtostation is selected based on the combined capacity of the macrocell and the femtocells after the hand-off.

Abstract: The Multi-Link Aircraft Cellular System makes use of multiple physically separated antennas mounted on the aircraft, as well as the use of additional optional signal isolation and optimization techniques to improve the call handling capacity of the Air-To-Ground cellular communications network. These additional techniques can include polarization domain and ground antenna pattern shaping (in azimuth, in elevation, or in both planes). Further, if code domain separation is added, dramatic increases in capacity are realized. Thus, the Air-To-Ground cellular communications network can increase its capacity on a per aircraft basis by sharing its traffic load among more than one cell or sector and by making use of multiple physically separated antennas mounted on the aircraft, as well as the use of additional optional signal isolation and optimization techniques.

Abstract: Methods and systems for auto coexistence priority selection for a SCO link are disclosed. Aspects of one method may include a first Bluetooth device communicating with a collocated WLAN device via a coexistence method. The first Bluetooth device, prior to executing a non-SCO task, which may comprise tasks that do not involve SCO packet transfer, may communicate low priority via the coexistence method if a Bluetooth SCO link is present between the first Bluetooth device and a second Bluetooth device, and if a current task being handled by the first Bluetooth device is a high priority task. If a SCO link is not present between the first and second Bluetooth devices, and if the current non-SCO task is a high priority task, the first Bluetooth device may communicate high priority via the coexistence method prior to executing the non-SCO task.

Abstract: A device identifies mobile devices within a geographical area associated with a carrier network. The device further divides the geographical area into cells. The device also collects network statistics associated with the mobile devices. The device assigns values to the cells based on the network statistics, and identifies locations in which to place the small cells within the geographical area based on the values.

Abstract: In a radio network, in which devices transmitting data seize one of a plurality of available frequency channels for the duration of the data transmission, during breaks between the individual data transmissions the frequency channel used is additionally seized in order to signal the seizure of the frequency channel to devices of another radio network. The seized frequency channel is monitored for the attempt of seizure by a device that is not part of the radio part and the additional seizure of the frequency channel is performed as a function of the detection of such an attempt.

Abstract: A game apparatus according to a preferred embodiment includes a first wireless communication module and a second wireless communication module. The first wireless communication module performs communication utilizing Bluetooth protocols, whereas the second wireless communication module performs communication utilizing IEEE protocols. The first radio communication module and the second radio module have a common reference communication cycle, and each communicates in communication cycles of an integral multiple of the reference communication cycle. A control unit sets offset time between the start time of a communication by the first wireless communication module until the start time of a communication by the second wireless communication module. In so doing, the control unit monitors the communication load of the first wireless communication module and sets the offset time based on a monitored result.

Abstract: A method, system and computer-readable product for a fixed mobile convergence system. The method includes analyzing at least one rule set associated with at least one user profile with the user profile being associated with at least one mobile device supporting more than one line. Each line offering one or more transports and options for establishing a telephone call. After analyzing the one or more rule sets, a context-specific real-time usage mode is determined based on the analysis which include selections of a telephone line, a transport and establishment options. After determining the usage mode, a call is established between one of the devices and a telephony endpoint, either incoming or outgoing, based on the determined usage mode.

Abstract: Provided is a multi-cell communication system using a rate-splitting scheme and a transmission frame for the multi-cell communication system. The multi-cell communication system may determine whether to perform a rate-splitting based on channel information of a macro base station and a femto base station in a multi-cell environment. The multi-cell communication system may allocate a power or a bandwidth to a message to be transmitted based on the channel information. In the multi-cell environment, a terminal may receive MAP information from a base station and may decode the received MAP information, determining a base station that performs the rate-splitting.

Abstract: A method, system, and computer-readable media are provided for allowing a mobile device to maintain communication connectivity during a handoff between wireless access points. In one aspect, the method may include negotiating security association information and establishing a first communication tunnel by tunneling an inner IP address within a first outer IP address. The method may further include authenticating a request for establishing a second communication tunnel by identifying the negotiated security association information within the request. Additionally, the method may include establishing the second communication tunnel by tunneling the inner IP address within a second outer IP address. Moreover, the method may include pushing data associated with the communication session through the second communication tunnel.

Abstract: A system and methodology that utilizes data collected by a femto access point (FAP) to identify and prioritize cell sites that can be acquired to improve indoor coverage of an existing communication network is provided. Moreover, the data can include femto network listen measurements that can be utilized to compare the macro coverage provided by the existing communication network with the radio coverage provided by a disparate communication network, for example, by the cell sites of an operator being considered for acquisition. In addition, a number of attachment attempts made to the FAP within a specified period can be calculated. Moreover, this information can be leveraged to make merger/acquisition decisions, including quantifying the number of sites of the disparate communication networks to operate and/or predicting the incremental performance gain opportunities that result due to the operation of the sites of the disparate communication networks.

Abstract: Provided are a wireless communication terminal that can select a power-efficient wireless communication system while keeping a data rate at a fixed level, and a communication system selection method. A wireless communication terminal is designed to be able to operate selectively according to a plurality of communication systems, and is configured to include: a required data rate calculation section that calculates a required data rate as a data rate needed to be satisfied in accordance with a remaining level of power and a communication history; and a communication system selection section that selects which communication system to be used through a comparison between a data rate of each of the communication systems to be determined based on a measured quality of communication service, and the calculated required data rate.

Abstract: A radio communication system, including: a first and second base stations; and a terminal, the first base station includes a first position information acquisition unit which acquires position information of the first base station; a first control unit which generates a new-installation massage including the position information and indicating that the first base station is a newly installed base station and transmits the message to the second base station, transmits a signal link establishment request message to each second base station in the number capable of transmitting to the terminal as adjacent cell information when the first base station receives a new-installation response message responding to the new-installation message from the second base station, generates the adjacent cell information indicating that the second base station transmitted a signal link establishment response message is an adjacent base station.

Abstract: In a wireless communications network, the presence of a wireless local area network in a cell segment is determined. An identifier of the wireless local area network in the cell segment is sent to at least one mobile station in the cell segment to enable the at least one mobile station to hand off to the wireless local area network. Optionally, information identifying geographic boundaries of cell segments and the wireless local area network can be sent to the at least one mobile station.

Abstract: When a radio terminal (200) receives interference from a small-cell base station (300), a large-cell base station (100) sends, to the small-cell base station (300), band use restriction information indicating a band with restricted use which is a frequency band, in which the use thereof needs to be restricted by the small-cell base station (300). In this instance, the large-cell base station (100) sets the upper and lower limit for the band with restricted use so that the upper and lower limit thereof match the limit of an S-CQI measured unit band.

Abstract: Embodiments of the invention provide for allocating spectrum in a wireless communication system that supports simultaneously at least a first mode of operation and a second mode of operation. Logic is arranged for determining a proportion of spectrum required for the wireless communication unit to operate simultaneously in both the first mode of operation and the second mode of operation. Logic for allocating spectrum allocates a temporary guard band between a first portion of spectrum for the first mode of operation and a second portion of spectrum for the second mode of operation for use while the wireless communication unit operates simultaneously in the first mode of operation and second mode of operation.

Abstract: An apparatus and method of switching a channel under wireless network circumstances is provided, which can secure network resources by performing channel switching and channel bonding with an adjacent network if the network resources of the currently participating network are insufficient in performing wireless data communications. The apparatus includes a message analysis unit analyzing at least one received channel information message and confirming whether a channel corresponding to the channel information message and a channel adjacent to the channel are usable, a channel switching unit performing a channel switching with a usable target channel among the channels with reference to whether the confirmed channel and the adjacent channels are usable, in accordance with a result of determining whether network resources of a currently used channel are insufficient, and a channel bonding unit performing a channel bonding between the channel-switched target channel and the adjacent channels.

Abstract: Embodiments describe registration in a wireless communication system. A method includes wirelessly transmitting over a WWAN a first registration message from a mobile device, wirelessly transmitting through the WWAN a second registration message to a WLAN access point and receiving at the mobile device access through the WLAN access point. According to another embodiment is a method for constructing a self-configuring ad-hoc network. The method can include receiving a GPS coordinate from a WWAN channel node at a management system and creating an initial topography based at least in part on the GPS coordinate to achieve a network connectivity with diverse routes between a plurality of nodes.

Abstract: Systems and methods for dual wireless communication technology communications are provided. A mobile station communicates with two transceivers of a base site, where each transceiver operates according to a different wireless communication technology. The mobile station can communicate uplink and downlink control information with a first transceiver of the base site while also communicating uplink and downlink data with a second transceiver. Alternatively, the mobile station may transmit uplink transmissions only to a first transceiver and only receive downlink transmissions from a second transceiver.

Abstract: According to one implementation of the present invention, a business logic application may function as a package tracking application to manage access to wireless access points in different WLANs along the route. A sensor node is initialized and configured with one or more connection parameter sets allowing it to associate with a given wireless network implemented by one or more access points. Before the sensor node disassociates with the wireless access point, the wireless access point transmits a new connection parameter set to the sensor node. This new connection parameter set may include a network ID for another wireless network. In one implementation, the sensor node re-initializes itself using the new connection parameter set information. This process may continue until the sensor node arrives at its final destination.

Abstract: A system for radio access in a wireless communication system, in which a number of RATs exist, includes: a RAS configured to share radio environment information and the RATs with an adjacent RAS using a macroband SPC, the RAS being reconfigurable in conformity with the RATs; and a RMS configured to transmit/receive the radio environment information and the RATs to/from the RAS using a microband SPC and access the RAS using the microband SPC, the RMS being reconfigurable in conformity with RAT of the accessed RAS.

Abstract: A digital television (TV) signal, received from a satellite, in a transceiver of a ship and of other water based communication devices, is demodulated and processed into a baseband TV signal and further processed and modulated into a CDMA or TDMA or OFDM modulated signal and transmitted to a mobile device. The mobile device in interactive communication with the transceiver controls the transceiver transmitted and received signal to and from the mobile device.

Abstract: Aspects of a method and system for utilizing tone grouping with Givens rotations to reduce overhead associated with explicit feedback information are presented. In one aspect of the invention, Givens matrices may be utilized to reduce a quantity of information communicated in explicit feedback information via an uplink RF channel. The explicit feedback information may include specifications for a feedback beamforming matrix that may be utilized when transmitting signals via a corresponding downlink RF channel. The feedback beamforming matrix may represent a rotated version of an un-rotated matrix. The Givens matrices may be utilized to apply one or more Givens rotations to un-rotated matrix. The rotated matrix may reduce the quantity of information communicated in the explicit feedback information. The quantity of information communicated in the explicit feedback information may be further reduced by utilizing tone grouping.

Abstract: In a non-limiting and exemplary embodiment, a method is provided for controlling co-existence of multiple radio access units. The method comprises: receiving a scheduling request comprising value information on at least some of radio independent scheduling parameters of a control interface common to a plurality of radio access units, scheduling radio access on the basis of the value information on at least some of the radio independent scheduling parameters, and sending a response to the scheduling request in a given form in accordance with the control interface common to the radio access units.

Abstract: A method for communications between neighboring wireless cells such as wireless regional area networks operating according to IEEE 802.22 specifications. The method involves scheduling inter-base station communications for over-the-air connections to allow neighboring base stations to communicate in environments where a single available channel is shared between the neighboring cells or where two or more channels used by two or more neighboring cells. In some embodiments, a bridge system, such as a bridge consumer premise equipment (CPE), positioned in an area of coverage overlap between two cells is used for inter-base station communications, and allocation and scheduling of bandwidth on the utilized channels is performed to provide interference free communications between the base stations. Existence announcements are provided in coexistence time slots and requests for bandwidth such as reserved and additional time slots are transmitted between the base stations using the coexistence time slots.

Abstract: A system is described. The system includes a fixed microwave path pair between a first site and a second site and an additional microwave path between the first site and a third site. A transceiver portion of the first site and a transceiver portion of the second site are configured to transmit on the fixed microwave path pair on TDD-FDD reversed paired frequencies. The transceiver portion of the first site is configured to transmit to the transceiver portion of the third site on one frequency of the paired frequencies using the side lobe radiation of an antenna at the first site.

Abstract: The present invention relates to systems and methods for a multi-cell deployment model of a wireless backhaul network that implements frequency reuse. The backhaul network includes a plurality of cells, each of which includes a center hub supporting wireless backhaul communication over four geographic sectors. A first tier of the plurality of cells includes a center cell configured to support a first alternating frequency reuse pattern of a first channel and a second channel over four corresponding geographic sectors. A second tier of the plurality of cells surrounds the first tier. The second tier includes a first cell configured to support the first alternating reuse pattern over four corresponding geographic sectors, and wherein the first cell is horizontally adjacent to the center cell.

Abstract: Methods for decommissioning wireless transmission sites include calculating coverage radii for wireless transmission stations, and representing the wireless transmission stations as a two-dimensional grid. In one embodiment, the virtual cells that comprise the grid having a virtual cell size that is based on the coverage radii. Virtual grid cells having excess wireless transmission stations are identified. Particular excess wireless transmissions stations are then selected for decommissioning based on a predetermined factor.

Abstract: A system and method of dynamically updating an almanac of base stations with wireless phones that are controlled by end users. First, second, and third location information are received respectfully from a first, second, and third wireless phones. A position of each wireless device is known. The distance between each wireless device an uncooperative base station is determined while accounting for an uncertainty factor. A location of the uncooperative base station is calculated using the first, second, and third location information and the distances. The almanac is updated with the location.

Abstract: A method for transmitting a signal from a mobile station of a multi-cell environment comprises being allocated with a specific frequency partition from a base station depending on a fractional frequency reuse scheme; receiving modulation and coding scheme (MCS) level information on the specific frequency partition or a specific resource region within the specific frequency partition from the base station; controlling transmit power corresponding to the MCS level depending on a location of the mobile station within a cell, if the specific frequency partition is a frequency partition shared with a mobile station located at an edge region of a neighboring cell; and transmitting a signal to the base station at the controlled transmit power.

Abstract: Method and apparatus for data access for a mobile terminal comprising a module for determining whether first and second modes of wireless network coverage is available, a module for selecting the first mode if available, a module for attempting access via the second mode on failure to establish access via the first mode and a module for monitoring availability of the first mode. Even when a connection is established via the second mode, availability of the first mode is monitored and access attempted, when second mode connection is idle.

Abstract: The present invention discloses a wireless microphone system and a method of signal synchronization thereof, which comprises the following steps: receiving or transmitting a first channel wireless signal to at least one first wireless microphone through a first base station; receiving or transmitting a second channel wireless signal to at least one second wireless microphone through a second base station; and controlling a slave base station through a master base station, such that the first and the second channel wireless signals are synchronously received or transmitted. When any one of the base stations is not received a beacon for a duration of time, the base stations automatically switch to be the master base station and start to transmit the beacon. When other base stations receive the beacon, they switch back to be the slave base stations and use the received beacon as the basis of synchronization time correction.