Abstract: In operation, a transmitting device selects a synchronization pattern associated with the desired timeslot that is at least mutually exclusive from synchronization patterns associated with other timeslots on the same frequency in the system. Once selected, the transmitting device transmits a burst embedding the synchronization pattern that was selected, where appropriate. If the receiving device detects the synchronization pattern, it immediately synchronizes with the timeslot with confidence that it is synchronizing to the desired timeslot by using sets of synchronization patterns associated with the desired timeslot that are at least mutually exclusive from synchronization patterns associated with the other timeslots on the same frequency.

Abstract: In a wireless communication system according to the present invention: a control device and a communication terminal communicate in an active period. The control device: generates a first beacon packet including one or more candidate channels; transmits the first beacon packet at the beginning of the active period; determines whether or not a use channel is to be changed based on a communication state, and generates a second beacon packet including information of a determination result; transmits the second beacon packet at the end of the active period; and, when it is determined that the use channel is to be changed, changes the use channel after the active period ends and before a next active period starts. The communication terminal: receives the first and second beacon packets; and, based on the second beacon packet, changes the use channel after the active period ends and before a next active period starts.

Abstract: The invention relates to methods and arrangements for the reliability handling of idle gap commands received in a unit of a mobile telecommunication system. A user equipment located in a cell of a mobile telecommunication network receives signalling gap commands used to activate or deactivate idle gaps for downlink measurements in the neighbor cells. It is determined whether the received gap command is reliable or not. Downlink measurements are then performed in accordance with a predefined rule in case the received gap command is determined as unreliable.

Abstract: Method and device for arbitration for time division multiple access using delta-sigma modulation for an integrated circuit are described. A method for arbitrating access to a shared resource among multiple devices includes obtaining a first arbitration factor. The first arbitration factor is first delta-sigma modulated to produce a first slot signal. The first slot signal is for Time Division Multiple Access-arbitrated access to the shared resource.

Abstract: Provided is a mobile communication system which includes a plurality of RAT (Radio Access Technology) and can eliminate the need of a control channel for reporting RAT information so as to prevent congestion or shortage of the control channel capacity. In the mobile communication system, an LTE relay station (30) has a cover area (31) identical to a cover area (21) owned by a WLAN host station (20) and relays/transmits the signal received from an LTE base station (10) to a mobile station (40) in the cover area (31). The LTE relay station (30) adds to the signal received from the LTE base station (10), one of the offsets: a frequency offset, a time offset, and a power offset as information indicating that the mobile station (40) which receives a relay signal from the local station is located in the cover area (21) of WLAN and transmits the signal after offset addition to the mobile station (40) located in the cover area (31) (i.e., the cover area (21)).

Abstract: Disclosed is a method that includes determining an identifier of an access terminal authorized to use an access point, and transmitting a service redirection message including the identifier. The method also includes transmitting a parameter that instructs the access terminal to wake up during the particular time slot in the repeating interval.

Abstract: A method for realizing space division multiplexing is provided. The method comprises steps as follows: A. acquiring space information of users, and calculating space division isolation between the users based on the acquired space information; B. generating a set of user groups for the space division multiplexing based on the space division isolation between users calculated in step A; C. selecting a user group from the set of user groups for the space division multiplexing generated in step B and allocating the same physical resource to two users among the selected user group when conducting the space division multiplexing. An apparatus for realizing space division multiplexing is further provided. Using said method and apparatus, the space division isolation can be realized reasonably with accuracy.

Abstract: A random access channel operating method in a mobile communication system is provided. The random access channel operating method includes: (a) selecting a transmission mode according to a load of random access channel and performing transmission to a mobile terminal; (b) receiving a message having a format corresponding to the selected transmission mode from the mobile terminal; (c) determining whether or not a preamble or data is included in the message received in (b) receiving of the message; and (d) if the data is determined to be included in the (c) determining, transmitting a response message for data reception to the mobile terminal. Accordingly, use efficiency of a random access channel can be increased by measuring a system load of the random access channel in a base station and changing a transmission format of a burst transmitted through the random access channel according to the measured load level.

Abstract: Systems and methods are disclosed for feeder link configurations to layered modulation. One feeder link system employs feeder link spot beam to antennas in distinct coverage areas to enable frequency reuse. Another system employs narrow beam width feeder link antenna to illuminate individual satellites also enabling frequency reuse. Yet another system uses layered modulation in the feeder link. Another feeder link system employs a higher order synchronous modulation for the satellite feeder link than is used in the layered modulation downlink signals.

Abstract: A method and apparatus for transmitting and receiving data in a Base Station (BS) of a communication system are provided. A controller determines a location of a Mobile Station (MS), and determines a transmission/reception scheme for data transmission and reception to/from the MS according to the location of the MS. A transceiver transmits and receives data to/from the MS using the determined transmission/reception scheme. Preferably, the MS is located in any one of a cell's inner region and a cell's outer region, the cell's inner region has a radius which varies according to interference between adjacent cells, and the cell's outer region is a region defined by excepting the cell's inner region from the entire cell region.

Abstract: Various techniques for routing data through a cluster are disclosed. The cluster includes a number of nodes that support communications by an access terminal. A node may be configured to use an identifier assigned to an access terminal to route data associated with the access terminal to another node in the cluster. The identifier is assigned by any node in the cluster.

Abstract: A system and method for resource allocation in wireless communications systems includes a method for operating a base station. The method includes receiving a resource request for radio resources for a mobile station and transmitting an indication of unallocated radio resources to the mobile station. A resource assignment is determined for the resource request, and the resource assignment is transmitted to the mobile station. The resource assignment comprises unallocated radio resources and a number of radio resources.

Abstract: A wireless network system using a cyclic frame including a beacon period (BP), a mesh contention access period (MCAP), and a slot period (SP). The cyclic frame has a frame structure that shares a channel hopping sequence of a node, thereby sharing the channel hopping sequence that operates as an existing mesh node without generating an additional channel hopping sequence, and supporting mesh and star type topologies together in order to efficiently operate a network.

Abstract: A radio frame control apparatus for controlling a radio frame of an orthogonal frequency division multiple access system, having a placement information generation section generating first placement information including a radio resource amount assigned to each terminal station based on a received radio resource request, a pseudo placement information generation section generating pseudo placement information including a temporal radio resource amount assigned to pseudo communication, a radio resource assignment section generating second placement information by inserting the pseudo placement information into the first placement information.

Abstract: Techniques for enabling broadband data rates at mobile terminals in a beyond-line-of-sight communication system are disclosed. Forward link time-diversity transmission methods and a time-diversity transmitter based upon blockage characteristics are provided. The transmitter optionally supports selective time-diversity and can operate at Ku-band or higher frequencies. A forward link time-diversity receiver and methods for receiving a forward link time-diversity signal are also disclosed. The forward link time-diversity receiver optionally provides low-jitter or low-delay characteristics. A return link transmitter and return link transmit methods which avoid blockages are also disclosed. The return link transmitter can include a signal presence detector and blockage prediction filter.

Abstract: A method for regulating power in a front-end circuit, the method includes determining, along a first communication path, an envelope of a baseband signal; generating at least one voltage control signal based on the determined envelope of the baseband signal; and adjusting one or both of power and/or gain of the front-end circuit using the generated at least one voltage control signal. The baseband signal is communicated to the front-end circuit using a second communication path. Signal delay along the second communication path is matched with signal delay along the first communication path. The at least one voltage control signal comprises a supply voltage signal and a bias voltage signal. The power of the front-end circuit may be adjusted using the supply voltage signal. The gain of the front-end circuit may be adjusted using the bias voltage signal.

Abstract: Techniques for MAC processing for efficient use of high throughput systems that may be backward compatible with various types of legacy systems are disclosed. In one aspect, a data frame is formed comprising a common portion for transmission in a format receivable by various stations, such as access points and remote stations. The data frame also comprises a dedicated portion, formatted for transmission to a specified remote station. In another aspect, the common portion is unsteered, and the dedicated portion is steered. In another aspect, an access point schedules an allocation in response to a data indication included in a common portion of a data frame transmitted from one remote station to another. In another aspect, a first station transmits a reference to a second station, which measures the reference and generates feedback therefrom.

Abstract: Disclosed is a method for distributing contention among terminals in a Contention Access Period (CAP) of a superframe in regard to a Medium (or Media) Access Control (MAC) layer employing a beacon-enabled mode in IEEE 802.15.4 standard. The method includes: dividing the CAP or the superframe into a plurality of sub-periods, all having the same size; receiving an association request message from a relevant terminal; and allocating one of the plurality of sub-periods to the relevant terminal, and transferring information on the sub-periods to the relevant terminal through a beacon frame, by a Personal Area Network (PAN) coordinator.

Abstract: A radio communication system, for example a TDMA/CDMA radio communication system, has at least one base station recurringly offering frequency channels for a random access for mobile stations in an upstream direction. The mobile station that requests a connection setup measures a reception power of a signal sent in a downstream direction by the base station and sets a transmission power for sending an access radio block to the base station dependent on the measured reception power. A variable transmission power control can thus be implemented at the mobile station side with the assistance of the measured reception power of the signal transmitted on the part of the base station, being also capable of being implemented for random access of the mobile stations, this having previously always occurred with maximum transmission power.

Abstract: Systems and methods for generating spectrally shaped pseudo random noise sequences are described, which may include generating an L-level PN sequence, where L is an integer greater than 1; up-sampling the PN sequence by a factor of M, where M is an integer greater than 1; and filtering the up-sampled PN sequence using a finite impulse response (FIR) filter of length M, where the coefficients of the FIR filter are chosen from a set of pre-determined values.

Abstract: Systems and methods for supporting more flexible coverage areas and spatial capacity assignments using satellite communications systems are disclosed. Antenna elements are arranged in one or more phased arrays. The phased arrays may be used to receive uplink communications, transmit downlink communications, or both receive uplink communications and transmit downlink communications. Beam forming networks (BFN's) associated with the one or more phased arrays may be dynamic, allowing for movement of the locations of the receive beams, the transmit beams, or both the receive beams and transmit beams. The beams may then “hop” from location to location according to a predefined or dynamic hopping pattern. In some embodiments, the hopping patterns may be time-varying and may be changed or updated on-the-fly.

Abstract: A medium access control method for optical-fiber TDMA networks is revealed. The TDMA indicates the technique of time-division multiple access which is used to provide medium-sharing environment. Once the MAC protocol implementing traffic control is applied to control access among nodes with the same optical fiber, the medium access in optical networks can be distributed logically and effectively among the nodes so as to improve unfair access in the optical TDMA networks. Therefore, the optical TDMA network is suitable to construct metropolitan area networks (MANs), local area networks (LANs) or subnetworks of public networks for reducing construction cost of networks, increasing bandwidth utilization and improving communicative performance.

Abstract: A method and mobile device for decoding a paging message transmitted as multiple bursts in a wireless communication system are provided. In the method, only the first burst among four bursts of a transmitted paging message is received and equalized. The equalized first burst is compared (e.g., by computing correlation) with a reference paging message. The first comparison result value obtained from the first comparison is compared with a threshold value. If the first comparison result value is greater than the threshold value, second through fourth bursts of the paging message are not received, and a previous decoded paging message is output and a sleep state is entered. If the comparison result value is not greater than the threshold value, the second through fourth bursts are received and decoded, the decoded paging message is encoded, and a first burst of the encoded paging message is stored as the reference paging message.

Abstract: A relay station and a method of operating a relay station are disclosed. The method includes decoding a received signal to restore the received signal into an information packet, and obtaining a first probability sequence representing probability information of respective information bits constituting the information packet, encoding the information packet to obtain a coded packet, and obtaining a second probability sequence representing probability information of respective coded bits constituting the coded packet by using the first probability sequence, and obtaining a modulated symbol by using the second probability sequence.

Abstract: A wireless relay communication system and method are provided. The system includes a BS, at least one RS and subscriber terminals. The method includes: configuring a downlink relay zone and an uplink relay zone in downlink sub-frame and uplink sub-frame of physical layer frame structure of a BS, respectively, configuring a downlink relay zone and an uplink relay zone in uplink sub-frame and downlink sub-frame of physical layer frame structure of an RS, respectively, to define one or more combinations of OFDMA symbols and relay subchannels or relay timeslots for communication between the RS and BS; performing relay communication between the BS, the RS and a subscriber station. In the invention, an advanced relay mode is supported, i.e. an MSS/SS may access BS via the relay of RS, thereby broadening the effective coverage of BS, and improving the throughput of MSS/SS.

Abstract: A communication system includes a plurality of mobile nodes forming a mesh network. A plurality of wireless communication links connect the mobile nodes together. Each mobile node is formed as a communications device and operative for transmitting data packets wirelessly to other mobile nodes via the wireless communications link from a source mobile node through intermediate neighboring mobile nodes to a destination mobile node using a link state routing protocol and multiple waveforms.

Abstract: Disclosed is a structure of a downlink common channel for transmitting an ACK/NACK to notify whether retransmission should be performed through a transmission position of the downlink common channel according to a channel code of a time slot allocated to a UE, and a method for distinguishing an ACK from a NACK, in using a HARQ scheme for uplink transmission of a TDD CDMA scheme in a 3G mobile communication.

Abstract: The invention concerns a method for performing a scheduling algorithm in a scheduler (120) of a wireless communication system, comprising the steps of obtaining from a communication unit (200) a minimum resource parameter, wherein said minimum resource parameter indicates a minimum of resources allocated to the communication unit in a scheduling frame to meet a resource constraint and scheduling allocation units for radio access to the communication unit in a scheduling frame in accordance with the minimum resource parameter.

Abstract: A method is proposed for supporting downlink JD (joint detection) in a TDD CDMA communication network system, comprising steps of: judging whether the CAI (code allocation information) in a downlink timeslot will change in the next TTI (transmission time interval); if the CAI will change, inserting the changed CAI as a specific control information into a specified field in the traffic burst in the downlink timeslot corresponding to current TTI; sending the traffic burst containing the specific control information to each UE (user equipment) in the downlink timeslot via a downlink channel.

Abstract: A communication system distributes, in the time domain, acknowledgment transmissions by a group of access terminals sharing a same time domain resource. A position of one or more access terminals in the group of access terminals is determined and each of the one or more access terminals then sends an acknowledgment transmission, such as an acknowledgment or negative acknowledgement, in a time slot that is N time slots after the shared time domain resource, where N is a function of the position of the access terminal in the group of access terminals.

Abstract: A method of providing a push-to-x service to a user of a data terminal which is connected to a packet-switched network includes, at a gateway interfacing the packet-switched network and the framework supporting the push-to-x service: receiving from the data terminal a request for accessing the push-to-x service; checking a user class to which the user belongs; and, according to the user class, assigning a push-to-x identity to the user either by selecting the push-to-x identity from a set of predefined push-to-x identities, or by retrieving the push-to-x identity from a user profile table; and accessing the framework and the push-to-x service by using the push-to-x identity.

Abstract: A communication device has a plurality of concurrently operating transceiver systems, each operating in a respectively different one of a plurality of communication systems. Operation of the transceiver systems is coordinated by receiving a plurality of requests from different ones of the transceiver systems, each of the requests being a request to access a communication medium for the purpose of transmitting or receiving a data packet. Utilization of an available time period is scheduled by selecting which one or ones of the requests to grant based, at least in part, on how many remaining times out of a maximum number of times each of the transmission systems' data packet is permitted to be retransmitted compared to other requests, on whether the requests are requests to transmit a data packet, and on whether the requests are requests to receive a data packet.

Abstract: Dynamic resource allocation is performed by first generating a plurality of slot sequences. A figure of merit based on weighted interference signal code power (ISCP) and weighted resource units is then generated for each timeslot of each slot sequence. The timeslots within each slot sequence are then arranged in a decreasing figure of merit. The slot sequences are the processed to determine whether they can support the code to be transmitted.

Abstract: A relay connection unit which is connected to a first communication line of a first communication protocol for communicating a first message via time-divided slots and a second communication line of a second communication protocol for communicating a second message with the ID and converts the communication protocols to relay the first message and the second message. The relay connection unit is characterized by converting a first storage table in which the ID of the second message is assigned for each time-divided slot for the communication of the first message and the second message into the first message and having processing section for transmitting the converted first message to the first communication line via the time slots assigned in the first storage table.

Abstract: A wireless communication system includes a multi service supplying unit which transmits the same data to a plurality of user equipment and a quality evaluation result collecting unit which collects quality evaluation results of a multi service from the plurality of user equipment. The wireless communication system includes a resource controlling unit which controls shared wireless communication resources used for the multi service according to the quality evaluation results.

Abstract: A method of managing data transmission is provided and includes measuring a first number of payload bits communicated over a bearer during a first time period. The first number of measured payload bits is divided by a length of the first time period to yield a short term average bit rate for the first time period. Also, a bit rate margin is added to the short term average bit rate for to yield a total bearer bit rate for the first time period. Further, a bearer bit rate can be selectively provisioned based on the total bearer bit rate for the first time period. The bearer bit rate can be provisioned based on whether the bearer is a fixed bearer or an adaptive bearer.

Abstract: A wireless device is operable to use received signals to divide time into a succession of frames, each frame having plural consecutive timeslots, and into a succession of four or more superframes. A transmitter is operated only in a single timeslot in one frame. A receiver is operated in the other timeslots in the frame and for all timeslots of immediately preceding and following frames, and in no other frames. This allows devices to predict periods in which to hibernate or carry out intensive tasks. The device determines which timeslots of the first frame are occupied to provide local awareness information, and transmits it as a code on its transmit timeslot along with payload data. This allows other devices in a network to obtain information about their local environment and about the environment of their neighbors. Routing decisions are made on this basis.

Abstract: A system and method for improving efficiency of satellite communications is described. In one embodiment, efficient satellite communications is enabled through event-driven reporting by a mobile terminal.

Abstract: An exemplary signal interference control system is disclosed that utilizes a computer system, such as programmable logic circuits or computer controlled logic gates, to generate blanking or control signals for various types of radio frequency receiver and transmitter combinations. Control signals are generated based on signal characteristic information stored in a memory including a delay following receipt of a pre-trigger signal from a radio frequency transmitter and a pulse width of control signal(s) generated for specified receivers, frequencies or systems. In one embodiment, information can be retrieved from a memory and used to generate an interference control signal. One or more control signals can be routed to a related or associated receiver to reduce or eliminate interference effects.

Abstract: A method for retransmitting data when data transmission/reception has failed in a wireless LAN system using visible light communication. A mobile node searches a received frame for a fast feedback slot allocated for retransmission information when momentary data transmission/reception failure has occurred. One mini-slot from among the plurality of mini-slots is selected from the fast feedback slot. The mobile node transmits a fast feedback message, including information for retransmission, to an access point by using the selected mini-slot.

Abstract: Methods and systems are provided for network-side setup of a packet-data communication session on behalf of a mobile station, followed by transfer of the communication session to the mobile station. A radio access network (RAN) receives from the mobile station an origination message comprising a code and a called-party identifier, the code indicating that the mobile station is requesting that, on behalf of the mobile station, the RAN set up a packet-based communication session between the mobile station and an endpoint associated with the identifier. Responsive to the origination message and on behalf of the mobile station, the RAN sends to the endpoint an invitation to participate in the communication session. Responsive to the endpoint accepting the invitation, the RAN sends to the mobile station information enabling the mobile station to engage in messaging with the endpoint related to the communication session and/or participate in the communication session with the endpoint.

Abstract: Systems and methods for supporting more flexible coverage areas and spatial capacity assignments using satellite communications systems are disclosed. Antenna elements are arranged in one or more phased arrays. The phased arrays may be used to receive uplink communications, transmit downlink communications, or both receive uplink communications and transmit downlink communications. Beam forming networks (BFN's) associated with the one or more phased arrays may be dynamic, allowing for movement of the locations of the receive beams, the transmit beams, or both the receive beams and transmit beams. The beams may then “hop” from location to location according to a predefined or dynamic hopping pattern. In some embodiments, the hopping patterns may be time-varying and may be changed or updated on-the-fly.

Abstract: A node for communicating with multiple ad hoc communication networks includes a first antenna configured to communicate in a first frequency band associated with a first ad hoc communication network and a second antenna configured to communicate in a second frequency band associated with a second ad hoc communication network. A transceiver is coupled to the first antenna and the second antenna. The transceiver is configured to transmit and receive messages. A control circuit is coupled to the transceiver and is configured to implement an access protocol having a time slot section. The access protocol is configured to switch communications in the time slot section between the first frequency band and the second frequency band.

Abstract: A method and apparatus for removing interference from a UpLink (UL) signal in a Time Division Duplex (TDD) system are provided. The method includes determining whether a section for receiving an UpLink (UL) signal from the MS overlaps with sections for sending a DownLink (DL) signal of neighbor BSs in service, the neighbor BSs sending the DL signal to another MS, when the UL signal section overlaps with the DL sections of the neighbor BSs, detecting DL transmit signal information from the neighbor BSs transmitting in the overlapping sections, and removing interference from the UL signal using the detected transmit signal information. Accordingly, the accuracy of detecting the signal from the MS can be raised without having to adopt the complex resource allocation scheme to avoid the interference of the neighbor BSs.

Abstract: Techniques to calibrate the downlink and uplink channels to account for differences in the frequency responses of the transmit and receive chains at an access point and a user terminal. In one embodiment, pilots are transmitted on the downlink and uplink channels and used to derive estimates of the downlink and uplink channel responses, respectively. Two sets of correction factors are then determined based on the estimates of the downlink and uplink channel responses. A calibrated downlink channel is formed by using a first set of correction factors for the downlink channel, and a calibrated uplink channel is formed by using a second set of correction factors for the uplink channel. The first and second sets of correction factors may be determined using a matrix-ratio computation or a minimum mean square error (MMSE) computation. The calibration may be performed in real-time based on over-the-air transmission.

Abstract: Disclosed are methods for broadcast transmission of data in frames having multiple time slots, from one transmitting node to multiple receiving nodes in a network, having the following steps: The sending out of at least one broadcast request message from the transmitter node to the receiver nodes, wherein the time slots available to the transmitter node for data transmission are indicated; the transmitting back of time-slot granting messages from the receiving nodes, wherein at least one of the time-slots available to the respective receiver node for data transmission is in each case indicated jointly with one at the transmitter node; the sending out of a confirmation message from the transmitter node to the neighboring receiving nodes, wherein all of the receiving nodes are indicated in the time-slot granting messages jointly with the time-slots available at the transmitter node; the performing of a broadcast transmission of the data from the transmitter node to the receiver nodes in the jointly available ti

Abstract: A system for implementing a multi-radio wireless network includes a plurality of endpoints wirelessly coupled to a relay station. The system also includes a base station wirelessly coupled to the relay station. The relay station includes a first radio operable to use a first channel to communicate with the base station. The relay station also includes a second radio operable to use a second channel to communicate with the plurality of endpoints. The relay station further includes a processor coupled to the first radio and the second radio. The processor is operable to relay data between the base station and the plurality of endpoints.

Abstract: A method and base station for forming an OFDM signal from a baseband signal includes a partitioning unit configured to partition a block of baseband signal samples into sub-blocks. A sub-carrier mapper maps the sub-blocks onto adjacent sub-carrier blocks of an OFDM multi-carrier to form corresponding unprefixed OFDM symbols. A cyclic prefix adder adds a cyclic prefix to each mapped sub-block to form prefixed OFDM symbols. Phase compensations force the unprefixed OFDM symbol part of all subsequently up-converted prefixed OFDM symbols to start at the same phase. Up-converters up-convert the phase compensated prefixed OFDM symbols to respective radio frequency bands having center frequencies and bandwidths that preserve the OFDM multi-carrier structure. A combiner combines the up-converted phase compensated prefixed OFDM symbols into an OFDM signal.

Abstract: To maximize power saving performance without compromising on the QoS requirement of an application stream, a method and wireless network device generates a subset of a periodic service interval can be used for medium time allocation and data and information can be transmitted in contiguous medium time allocated this way. This selection of a period of time below service capacity allows multiple applications access the medium and for the selection of contiguous medium time during which data transmission can occur.

Abstract: A device (D) is dedicated to data stream processing within a communication satellite of a communication network.