Abstract: This invention is a method for time-sharing sounding resources. This invention time-shares one sounding source across plural user equipment for different sub-frames. This invention uses different sounding periods which are periodic and either non-changing in time or changing in time. Different user equipment have sounding periodicities where one is an integral multiple of the other. This invention also allocates and updates a sub-frame offset for each user equipment.

Abstract: The wireless communication device and corresponding method described herein selectively switches between a single-frequency mode, such as appropriate for an EDGE network, and a multiple-frequency mode, such as appropriate for a multi-carrier EDGE network. Accordingly, a transmitting wireless communication device selectively switches between a single-channel mapping unit, used during the single-frequency mode, and a multi-channel mapping unit, used during the multiple-frequency mode. The multi-channel mapping unit modulates input data to output a modulated data stream for each of multiple adjacent frequency channels that, when combined, produce a multiple-frequency signal with reduced peak-to-average ratio. A receiving wireless communication device selectively switches between a single-channel demodulator, used during the single-frequency mode, and a multi-channel demodulator, used during the multiple-frequency mode.

Abstract: A first aspect of the invention is a method of transmitting data packets over a transmission channel shared by a plurality of users, based on the time and/or frequency diversity slotted Aloha technique, in which at least two replicas of each packet to be transmitted are sent over said transmission channel, wherein each replica transports signaling information enabling the other replica(s) of the same packet to be located in the time and/or frequency domain. A second aspect of the invention is a method of recovering packets in the receiver, the method exploiting said signaling information to execute an interference cancellation algorithm for recovering packets corrupted by collisions caused by access conflicts. Other aspects of the invention are a transmitter equipment and a receiver packet recovery equipment adapted to use said methods.

Abstract: A method for communication includes deploying a half-duplex terminal in a wireless full-duplex communication network configured to permit simultaneous transmission of downlink paging messages and uplink access messages between a base station and full-duplex mobile terminals in the network. The half-duplex terminal is assigned paging channel slots in a cyclical sequence of the paging channel slots, so that the base station transmits the downlink paging messages to the half-duplex terminal only during the assigned paging channel slots. The half-duplex terminal is controlled so that the half-duplex terminal transmits the uplink access messages only during an interval bounded by the assigned paging channel slots occurring in successive cycles in the sequence.

Abstract: A method of reducing resource overhead attributed to preambles in a communication system includes transmitting, at a transmitter, one or more signals including a first packet. The first packet is transmitted in a first time-frequency grant including a first set of one or more subcarriers. The first packet includes a full preamble including reference signal information for determining a total channel estimate for every subcarrier to be used in transmission of the first packet. A second packet is transmitted in a second time-frequency grant including a second set of one or more subcarriers without a full preamble when a receiver configured to communicate with the transmitter can determine a phase offset between the transmitter and the receiver from the signals received at the receiver.

Abstract: Disclosed herein are methods, computer program instructions and apparatus for performing random access procedures in a wireless communication system. A method includes receiving at a network access node, in different time and frequency resources that are allocated for preamble transmission, and in different ones of a plurality of component carriers, a plurality of random access requests from individual ones of a plurality of user equipments; and transmitting a corresponding plurality of random access responses in a time and frequency resource of a single component carrier.

Abstract: A transmission/reception apparatus capable of preventing degradation in system capacity, improving system throughput, and minimizing power consumption of an apparatus is disclosed. In this apparatus, a propagation path determining section (131) determines a propagation path state in all the regions in the used frequency band of a received multicarrier signal based on propagation path estimation information such as a channel estimation value and the like calculated in a propagation path estimating section (126), and specifies a frequency region having a good propagation path state from the used frequency band of OFDM. More specifically, the used frequency band is divided into a plurality of frequency bands (subbands), each comprised of smaller predetermined bandwidth, and by selecting a subband having a good propagation path state in the propagation path determining section (131), a frequency region having the good propagation path state is specified.

Abstract: Prior to transferring to a radio communication system, at least one data block is encoded according to predetermined quality-of-service requirements with the aid of a first code. Subsequently, the data block, encoded by the first code, is further encoded according to the radio transmission properties of a usable radio transmission source with the aid of a second code.

Abstract: A technique for improving the efficiency of downloading transmission data is disclosed. An information downloading apparatus downloads differing sets of information to predetermined groups to which a mobile terminal may belong. This apparatus includes a channel selecting unit for selecting from plural information channels an information channel for transmitting transmission data and a transmitting unit for transmitting transmission data using the selected information channel. The channel selecting unit selects an information channel so that sets of transmission data with differing destination addresses may be transmitted through differing information channels. The transmitting unit transmits to each group, through a control channel, information pertaining to whether a set of transmission data exists, the information channel to be used if the set of transmission data exists, and the data length of the set of transmission data. The control channel includes time slots that are associated with the groups.

Abstract: A technique for improving the efficiency of downloading transmission data is disclosed. An information downloading apparatus downloads differing sets of information to predetermined groups to which a mobile terminal may belong. This apparatus includes a channel selecting unit for selecting from plural information channels an information channel for transmitting transmission data and a transmitting unit for transmitting transmission data using the selected information channel. The channel selecting unit selects an information channel so that sets of transmission data with differing destination addresses may be transmitted through differing information channels. The transmitting unit transmits to each group, through a control channel, information pertaining to whether a set of transmission data exists, the information channel to be used if the set of transmission data exists, and the data length of the set of transmission data. The control channel includes time slots that are associated with the groups.

Abstract: A communication system is provided that enables a node to be identified by a controller. To establish a communication link from the node an alignment signal is received from the controller. Upon receiving the controller alignment information, the node sends a response including information the node randomly generated. The controller then responds by sending back at least a portion of the information the node randomly generated indicating that the node has been recognized by the controller.

Abstract: Channel reservation in time division duplex for devices in systems involving, for example user devices and access points, may be accomplished using channel reservation request messages, such as request-to-send (RTS) messages and channel reservation grant messages, such as clear-to-send (CTS) messages. A method for channel reservation may include preparing a frame including at least one channel reservation request message and at least one channel reservation grant message. The preparing may include multiplexing the at least one channel reservation request message and the at least one channel reservation grant message at least by frequency-division multiplexing. The method may also include transmitting the frame from a first node to a second node, wherein the channel reservation request message and the channel reservation grant message relate to communications between the first node and the second node.

Abstract: The present invention increases the available spectrum in a wireless network by sharing existing allocated (and in-use) portions of the RF spectrum in a manner that will minimize the probability of interfering with existing legacy users. The invention provides interference temperature-adaptive waveforms, and a variety of physical and media access control protocols for generating waveforms based on measurement and characterization of the local spectrum. The invention measures the local spectrum at a receiving node, generates an optimal waveform profile specifying transmission parameters that will water-fill unused spectrum up to an interference limit without causing harmful interference to primary and legacy transmitters using the same frequency bands, and enables simultaneous transmit and receive modes at a multiplicity of transceivers in a wireless network.

Abstract: An apparatus for transmitting signals with multiple antennas is disclosed. The multiple antenna transmission apparatus performs space-time encoding or space-frequency encoding, and cyclically delays the encoded symbol with a plurality of delay-values to generate a plurality of delayed symbols. The multiple antenna transmission apparatus transmits the plurality of delayed symbols to the channel through a plurality of antennas. By changing the number of space areas for encoding and the number of delay-values for delaying, the number of antennas for the multiple antenna transmission apparatus is easily expanded.

Abstract: A method includes, in response to receiving implicit signaling of the radio resource, and in response to a plurality of wireless communication system cell-specific static and semi-static input parameters, determining a plurality of output parameters and allocating radio resources using the determined output parameters. Also disclosed are computer readable storage mediums for storing programs that operate in accordance with the methods, as well as various devices that operate in accordance with the methods and that include the computer readable storage mediums.

Abstract: A method for the partitioning frequency resources used in the transmission of control signals and data signals by user equipments in a communication system. The control signals and data signals are for periodic transmission and dynamic transmission. Also provided is an apparatus and method for user equipments to determine the first frequency unit available for the transmission of dynamic control signals, such as acknowledgement signals associated respective reception of data signals configured through a scheduling assignment by a serving Node B. The utilization of the operating bandwidth is maximized by avoiding fragmentation and facilitates the achievement of reception reliability targets particularly for control signals.

Abstract: Apparatus, methods and computer program products operate an electronic device to generate downlink allocation information and uplink allocation to be signaled to other electronic devices operative in a wireless communications system; and to operate radio apparatus to signal the downlink allocation information and uplink allocation information in a control channel, wherein the downlink allocation information is signaled in a downlink allocation portion of the control channel and the uplink allocation information is signaled in an uplink allocation portion of the control channel. In a variant, apparatus, methods and computer program products operate an electronic device to receive downlink and uplink allocation information signaled in a control channel by a wireless communications system; and to search for downlink allocation information in the downlink allocation portion and uplink allocation information in the uplink allocation portion.

Abstract: There is provided a communication system, comprising a network infrastructure comprising: a transmitter configured to transmit signaling information to user terminals, the signaling information being related to the allocation of the plurality of sub-carriers at a common frequency band used for data transmission between the multiple user terminals and a network infrastructure; a processor configured to divide the common frequency band into two suppression bands at the edge zones of the common frequency band and to provide a safe band between the two suppression bands, the two suppression bands including sub-carriers having a predetermined amount of decreased channel estimation accuracy compared with the other sub-carriers of the common frequency band; and a processor configured to allocate signaling information, related to the allocation of at least one sub-carrier to a user terminal having an expected signal to interference-plus-noise ratio at a predetermined level, to at least one sub-carrier included in the

Abstract: A method and apparatus for coordinating communication in a wireless sensor network may include a plurality of nodes, such as routers, edge nodes, data accumulators and/or gateways. Time management functions, such as determining an elapsed time, may be controlled based on a detected temperature, e.g., a temperature detected at a node, and/or based on a detected clock skew between two or more clocks in two or more different devices. Accurate time management may allow for devices to more accurately coordinate communication instances, e.g., communication that occurs at periodic wake up times. A cluster head, such as a data accumulator, may be associated with a network after its initial formation and cause nodes in the network to alter their hierarchy in the network, thereby making the cluster head accumulator a parent to nodes in the network. Nodes having a relatively lower hop count may have a higher battery capacity than nodes having a higher hop count.

Abstract: In a timing analysis apparatus for use in a semiconductor integrated circuit, which analyzes operation timing of a semiconductor integrated circuit having a logic gate circuit including a plurality of logic gates, a controller detects at least one of a power supply voltage and a ground voltage of a power supply, decomposes the noise waveform into frequency components, classifies the frequency components into low-frequency components lower than a predetermined threshold frequency and high-frequency components higher than the threshold frequency, calculates a static delay time of each of the logic gates due to the low-frequency components, calculates a dynamic delay time of each of the logic gates due to the high-frequency components, and determines a delay time of each of the logic gates by synthesizing the calculated respective delay times.

Abstract: A method of transmitting orthogonal frequency division multiple access (OFDMA) signals includes transmitting, at a first transmitter of a network, a first stream of data having a first number of symbols over a first time interval using a first set of one or more OFDMA subcarriers. At a second transmitter of the network, a second stream of data is transmitted having a second number of symbols over a second time interval, different in duration than the first time interval and overlapping the first time interval. The second burst of data is transmitted using a second set of one or more OFDMA subcarriers. The first time interval and first set of subcarriers define a first time-frequency grant, the second time interval and second set of subcarriers define a second time-frequency grant, and the first and second time-frequency grants are granted by a network coordinator node of the network.

Abstract: A service provider discovery method in a wireless network environment, includes receiving, by the gateway, a service request (SREQ) packet which is broadcast from a first mobile node in the ad-hoc network; updating and transmitting, by the gateway, the SREQ packet to a service repository which stores at least one service provider information, in the infrastructure network; transmitting, by the service repository, a service reply (SREP) packet containing information relating to a service provider which provides a service requested by the SREQ packet to the gateway, and updating and transmitting, by the gateway, the SREP packet to the first mobile node. Accordingly, the service can be used in association with the ad-hoc network and the infrastructure network.

Abstract: In orthogonal frequency division multiplexing (OFDM) multiple-input multiple-output (MIMO) systems, a wireless transmit/receive unit (WTRU) selects a random access channel (RACH) and a phase for a constant amplitude zero auto correlation (CAZAC) sequence for RACH transmission. The WTRU then transmits a RACH transmission to a Node B via the selected RACH. Once the RACH transmission is detected, the Node B sends an acknowledgement (ACK) to the WTRU over an ACK channel. The Node B may transmit the ACK on a shared channel. The WTRU may ramp up transmit power while the RACH transmission is transmitted, or steps up transmit power of a subsequent RACH transmission. The RACH transmission and data transmission may be either time multiplexed or frequency multiplexed. A plurality of RACHs may be defined and one of the defined RACHs may be selected randomly or based on predetermined criteria.

Abstract: Provided is a carrier allocation method in a multi cell OFDMA system capable of improving the system capacity and the bit error rate performance. In the method, a user terminal U which has received broadcast information (S101) uses an empty carrier to transmit a known symbol to a base station device (S103). The base station device estimates an average channel gain of an empty carrier block by using the received known symbol (S104), compares the channel gain sizes of the respective carrier blocks according to the estimated average channel gain and allocates a carrier block having a large channel gain to the user terminal (S105), and compares channel gains of the respective carriers in the carrier block allocated to the user terminal and selects a carrier having a channel gain lower than a predetermined threshold value (S106).

Abstract: The present invention describes transmitting the page channel, which may comprise a quick page channel and a regular page channel, and the broadcast control channel, which conveys the system information, through the same time-frequency resources across the sectors of a wireless communications network.

Abstract: One aspect of the present invention relates to a base station wherein either resource blocks resulting from division of a system bandwidth into blocks of consecutive frequency subcarriers or distributed type resource blocks consisting of frequency subcarriers discretely distributed within the system bandwidth and resulting from segmentation of the resource blocks into multiple resource blocks are assigned to mobile stations, the base station including: a scheduling unit configured to assign either the resource blocks or the distributed type resource blocks to the mobile stations at a predefined assignment cycle based on respective downlink reception channel states transmitted from the mobile stations.

Abstract: A method of allocating radio resources in a wireless communication system is disclosed. A method of allocating radio resources from a network of a wireless communication system in accordance with a plurality of scheduling modes comprises transmitting first scheduling information to a user equipment to allocate radio resources to the user equipment in accordance with a first scheduling mode, the first scheduling information including a first user equipment identifier, and transmitting second scheduling information to the user equipment to allocate radio resources to the user equipment in accordance with a second scheduling mode, the second scheduling information including a second user equipment identifier.

Abstract: To allocate a terminal apparatus to a time slot to which a plurality of subcarriers are assigned, a base station apparatus first acquires the strength of signals between the base station apparatus and the terminal apparatus. Then the base station apparatus specifies a group, containing the acquired strength, among a plurality of groups. The plurality of groups are predefined in a manner such that the ranges of values of the acquired strengths differs respectively. Time slots to be allocated are predefined respectively for the plurality of groups. A time slot corresponding to the specified group is selected, and a subcarrier to be assigned to the terminal apparatus is selected from among a plurality of subcarriers contained in the selected time slot.

Abstract: A serial intelligent cell (SIC) and a connection topology for local area networks using Electrically-conducting media. A local area network can be configured from a plurality of SIC's interconnected so that all communications between two adjacent SIC's is both point-to-point and bidirectional. Each SIC can be connected to one or more other SIC's to allow redundant communication paths. Communications in different areas of a SIC network are independent of one another, so that, unlike current bus topology and star topology, there is no fundamental limit on the size or extent of a SIC network. Each SIC can optionally be connected to one or more data terminals, computers, telephones, sensors, actuators, etc., to facilitate interconnectivity among such devices. Networks according to the present invention can be configured for a variety of applications, including a local telephone system, remote computer bus extender, multiplexers, PABX/PBX functionality, security systems, and local broadcasting services.

Abstract: Systems and methods of allocating radio resources are provided. It is determined whether a bandwidth assigned to a communication station can be satisfied using available subchannels and a modulation and coding scheme (MCS). When the bandwidth cannot be satisfied using available subchannels and MCS, a number of the available subchannels and an MCS are selected. A power level for communications transmitted to the communication station is adjusted relative to a power level determined based a signal quality measurement. Information is transmitted to the communication station using the selected number of subchannels, MCS and adjusted power level.

Abstract: An apparatus, method, and computer readable medium thereof for simultaneously establishing links with a plurality of nodes in a wireless network are provided. A processing module determines whether a mesh network configuration message of the apparatus has space to packet an information element and determines whether to transmit a Neighbor Link Establishment information element to one of the nodes. If the mesh network configuration message has space to packet an information element and the Neighbor Link Establishment information element needs to be transmitted to one of the nodes, the Neighbor Link Establishment information element will be packeted into the mesh network configuration message. Finally, a transmission module transmits the mesh network configuration message to the nodes in order to solve the problem of increasing time during link establishment and avoid deadlock among the nodes when the apparatus of the prior art establishes links with the nodes simultaneously.

Abstract: A communications system may include a first wireless communications device communicating based upon a first wireless communications protocol, a second wireless communications device communicating based upon a second wireless communications protocol different from the first wireless communications protocol, and a wireless base station. The wireless base station may communicate with the first wireless communications device and the second wireless communications device based upon a frame structure. The frame structure may be defined by sub-carriers at respective different frequencies and symbols at respective different times. The frame structure may include a frame control header, a first frame portion for communicating with the first wireless communications device based upon the first wireless communications protocol, and a second frame portion for communicating with the second wireless communications device based upon the second wireless communications protocol.

Abstract: A predetermined network packet is utilized for power reduction in either or both of a transmitter and receiver when information is not needed. Upon detection of the predetermined network packet type, various portions of the transmitter and/or receiver may be clock gated or powered down.

Abstract: A method and system operable to implement a multiple range, and optionally one-dimensional, transport scheduling process suitable to facilitate signal transport over a network for a variety of traffic types with different service requirements where two-dimensional mapping across frequency and/or time is required.

Abstract: An apparatus and a system, as well as a method and article, may operate to reserve access to one or more overlapping channels having a resource allocation (e.g., a frequency range) overlapping a resource allocation of at least two overlapped channels by reserving access to the overlapped channels. Reservation of the overlapped channels may occur in a substantially simultaneous, serial, or semi-serial fashion.

Abstract: The invention discloses a distribution method of channelization code in code division multiple access system, which including: A. the spread spectrum codes distributed to every sector and the correlated coefficients between the spread spectrum codes distributed to every neighboring sector are calculated according to the cellular codes and the channelization codes distributed to every sector, when the network is programmed; B. every sector is divided into different regions and the edge region of every sector is formed; C. the priority of which every channelization code is at the edge region of every sector is decided according to the correlated coefficients between the spread spectrum codes distributed to every neighboring sector; D. the position information of user is real-time calculated during the operation of system, and which region the user positioned in sector is determined according to the position information; E.

Abstract: An apparatus and associated methods to implement a high throughput wireless communication system are generally presented.

Abstract: A sequence distributing and sequence processing method and apparatus in a communication system are provided. The sequence distributing method includes the following steps of: generating sequence groups including a number of sequences, the sequences in the sequence groups are determined according to the sequence time frequency resource occupation manner which is supported by the system; distributing the sequence groups to cells. The method avoids the phenomenon that signaling transmission is needed to distribute the sequences to the cells for different time frequency resource occupation manner, and saves in so far as possible the wireless network transmission resource occupied during the process of distributing the sequences through distributing the sequence groups comprising a number of sequences to the cells.

Abstract: A method and a system for selecting antennas in an orthogonal frequency division multiple access (OFDMA) network. The network includes a base station and mobile stations. The mobile station includes multiple antennas. The base station and the mobile stations communicate with each other using frames. The base station transmits a down-link (DL) subframe of the frame to the mobile station. The DL subframe allocates one or more symbols and one or more subcarriers of an up-link (UL) subframe of the frame for antenna selection signals. The mobile station transmits the UL subframe including the antenna selection signals at the allocated subcarriers and symbols to the base station. Then, the base station selects a subset of the antennas based on the antenna selection signals.

Abstract: A technique for generating a Single-Carrier Frequency Division Multiple Access, or SC-FDMA, signal having a transmission bandwidth and comprising a Constant Amplitude Zero-Autocorrelation, or CAZAC, sequence of length NCAZAC is described. It will be assumed that the SC-FDMA signal has a time domain formulation with a term representative of an Inverse Discrete Fourier Transform, or IDFT, of length M, with M>NCAZAC.

Abstract: A method and apparatus for transceiving additional data using unallocated slots of a header of a frame used in a broadcast system are provided. A data transceiving apparatus includes a data transmitter for encoding, modulating, and transmitting a broadcast frame including a first region containing broadcast data and a second region containing additional data and a data receiver for receiving the broadcast frame, extracting at least any of the broadcast data and the additional data from the broadcast frame, and processing the broadcast data and the additional data independently.

Abstract: Methods and apparatus for supporting peer to peer communications are described. A plurality of wide area network communications bands in a wireless communications system are also available for use to communicate peer to peer signals. Some WAN bands may be, and sometimes are unused by a base station for WAN communications at a particular location. A peer to peer communications device monitors one or more WAN communications bands. Received signals in the monitored band or bands are compared to threshold criteria. In one embodiment, if the peer to peer communications device finds that no signal is detected in the monitored band or that the received evaluated signal from the monitored band is below a specified threshold level, then the peer to peer wireless terminal is allowed to use a band which is either the monitored band or a band corresponding to the monitored band for peer to peer signaling.

Abstract: A method and apparatus for allocation of channel resources for relay stations operating in a multihop wireless communication system is provided for herein. The method and apparatus includes a signaling protocol between a base station scheduler and a relay station scheduler so as to achieve efficient utilization of the sector channel resources, while minimizing signaling overhead due to base station-relay station scheduler interaction.

Abstract: A method and system for interference reduction for telecommunication systems are disclosed. The system comprises a base station control device (BCD) for configuring one or more parameters for operating one or more base stations (BSs), a first BS covering a first cell having one or more mobile terminals therein, a second BS covering a second cell neighboring to the first cell and sharing a predetermined frequency band with the first cell, wherein one or more radio frames constructed for communications between the first BS and any mobile terminal of the first cell and one or more radio frames constructed for communications between the second BS and any mobile terminal of the second cell are distinguishable by defining different channel configuration sets having one or more operation parameters, wherein the parameters includes a training sequence, a spreading code, and a channel observation window position.

Abstract: To facilitate simultaneous PLC communication using first and second PLC protocols that are different from each other, frequency bands are dynamically assigned on demand to first and second PLC home networks that use the respective first and second PLC protocols.

Abstract: A method reduces channel interference in a communication system that includes base stations and terminal stations with each base station having a plurality of sectors, each sector having a channel, and with each terminal station associated with a sector of a base station. A first set of terminal stations associated with a first sector that may potentially interfere with a second set of terminal stations associated with a second sector is determined. A first frequency sub-channel for use by the first set of terminal stations is selected and a second frequency sub-channel for use by the second set of terminal stations is selected. Transmissions by the first set of terminal stations are coordinated with transmissions by the second set of terminal stations, thereby reducing channel interference between the terminal stations of the first set and the terminal stations of the second set, as seen by a base station in the first or second sector.

Abstract: A base station (10) performs bi-directional radio communications with terminal station apparatuses using communication frames each having time slots and being composed of a first region with a predetermined open-loop period and a second region with an open-loop period shorter than the open-loop period of the first region. A level detecting section (21) detects a received level of an uplink slot configured in the second region. A transmission diversity section (14) performs diversity transmission on a downlink transmission signal assigned to a downlink slot corresponding to the uplink slot, corresponding to a result of detection of the received level. It is thereby possible to enhance the effect of improving the received quality due to transmission diversity without degrading the transmission efficiency.

Abstract: Methods and apparatus operative in a wireless communications system divide a communications resource available for performing information transmission and retransmission operations into a plurality of communication resource units. The units are ordered in a predetermined order. A first group of communication resource units are selected from the communication resource in ascending order and assigned to a first group of communications devices to perform information transmission operations in a first time period. A second group of communication resource units are selected from the communication resource in descending order and assigned to a second group of communications devices to perform information transmission operations in a second time period. At least a portion of the first group of communication resource units is assigned to the first group of communication resource units to perform retransmission operations.

Abstract: A method of selecting a receiving apparatus for co-channel operation, the method comprising: transmitting a first and a second data at predetermined respective power levels on a single first channel comprising a single frequency and time slot; receiving the data; measuring a characteristic of the data; transmitting a signal indicating the measured characteristic; receiving the indicating signal; and responding to the received indicating signal by selecting the receiving apparatus for co-channel operation depending on the measured characteristic.

Abstract: A method and an apparatus for the transmission of data is provided, wherein the data, in a first operating mode, are transmitted in a plurality of first frequency bands and, in a second operating mode, are transmitted in a plurality of second frequency bands. A number of the first frequency bands is in this case greater than a number of the second frequency bands. The first operating mode is used if there is a large quantity of data to be transmitted. If only a small quantity of data is to be transmitted, switchover to the second operating mode is effected, whereby a power saving can be achieved, particularly in digital parts of a transmitting device and of a receiving device.