Abstract: An OFDM signal receiver reduces frequency response estimation error, and reduces the circuit scale needed for a hardware implementation and the number of operations performed in a software implementation. A first Fourier transform circuit converts an OFDM signal to the frequency domain by a Fourier transform. A first divider divides the pilot signal contained in the frequency domain OFDM signal by a specified pilot signal. A zero insertion means then inserts zero signals in the first divider output. A window function multiplying means multiplies the zero insertion means output by a window function, and an inverse Fourier transform means applies an inverse Fourier transform to the multiplier output. A coring means then cores the inverse Fourier transform output, and truncation means truncates the coring means output at a specified data length. A second Fourier transform circuit applies another Fourier transform to the truncated result.

Abstract: Provided are a method for generating a two-dimensional orthogonal variable spreading code and a Multiple Input Multiple Output (MIMO) system using the same. The MIMO system can increase a communication capacity in an asynchronous multiple user system as well as a synchronous system in a wideband-Code Division Multiple Access (CDMA). The MIMO system includes: a transmitting block for temporally and spatially encoding a plurality of user data, spreading the user data into orthogonal channel signals, and transmitting them to antennas; and a receiving block for receiving the orthogonal channel signals and performing temporal and spatial decoding and despreading on them. Herein, the transmitting block includes: a space time code (STC) encoding unit for generating and outputting a predetermined number of STC streams; and a jacket orthogonal variable spreading function (JOVSF) channel code spreading unit for spreading the STC streams into orthogonal channel signals by using a JOVSF.

Abstract: A method for maintaining the quality of transmission from a head end to a service unit in a telecommunications system that uses a multi-carrier transmission scheme with dynamic bandwidth allocation is disclosed. The method involves allocating a first payload channel to a service unit in a subband of a transmission channel of the telecommunications system and monitoring the quality of the first payload channel. When the quality of the first payload channel drops below a threshold, the method allocates a second, different payload channel to the channel unit.

Abstract: The present invention provides an interworking peripheral module, which acts as a liaison between a circuit-switched telephone switch and a packet network. The interworking peripheral module includes a TDM module, such as a common equipment module, which cooperates with the telephony switch and two TDM-packet modules, which convert outgoing TDM traffic to packets and incoming packets to TDM traffic. The TDM-packet modules act in a redundant fashion, wherein one of the TDM-packet modules is active while the other TDM-packet module is inactive. The active TDM-packet module will convert the outgoing TDM traffic to packets and route the outgoing packets to a packet network via one or more routers. The inactive TDM-packet module will also convert the TDM traffic to packets in an identical fashion to the active TDM-packet module, but will drop the outgoing packets before they are routed to the packet network.

Abstract: The invention allows binary class based control of a communications network and its services. A fault table and a state table are generated. The state table is compared with the state table in response to detecting a change in a state table entry. If the changed state table entry equals a corresponding fault table entry, an appropriate control action is determined and performed. The invention allows controlling a communications network, communications network resources, communications network services and services provided over the communications network significantly faster than prior art implementations.

Abstract: Link failure messages are sent through a network to accelerate convergence of routing information after a network fault. The link failure messages reduce the oscillations in routing information stored by routers, which otherwise can cause significant problems, including intermittent loss of network connectivity as well as increased packet loss and latency. For example, the link failure messages reduce the time that a network using a path vector routing protocol, such as the Border Gateway Protocol (BGP), takes to converge to a stable state. More particularly, upon detecting a network fault, a router generates link failure information to identify the specific link that has failed. In some types of systems, the router communicates the link failure information to neighboring routers as well as a conventional update message withdrawing any unavailable routes. Once other routers receive the link failure information, the routers do not attempt to use routes that include the failed link.

Abstract: Graceful restart in routers having redundant routing facilities may be accomplished by replicating network (state/topology) information.

Abstract: Redundancy mechanisms are difficult to implement in a node holding connections spanning over a wide telecommunications network. Novel redundancy mechanisms to be implemented on a telecommunications node is described. In the mechanisms, an inactive device is maintained in hot standby with the active device so that a substantially hitless activity switch can be performed. The inactive device is kept in synchrony with the active device by updating the inactive device only when the status of connection has changed.

Abstract: A fast reroute (FRR) technique is implemented at the edge of a computer network. If an edge device detects a node or link failure that prevents it from communicating with a neighboring routing domain, the edge device reroutes at least some data packets addressed to that domain to a backup edge device which, in turn, forwards the packets to the neighboring domain. The backup edge device is not permitted to reroute the packets a second time. According to the inventive technique, the edge device first identifies a group one or more possible backup edge devices and then selects at least one preferred backup edge device from the group. The edge device makes its selection based on the values of one or more metrics associated with the possible backup edge devices. The metrics are input to a novel selection algorithm that selects the preferred backup edge device(s) using a hierarchical selection process or a weighted-metric selection process, or some combination thereof.

Abstract: In a tunnel connecting a source node to a destination node, data transfer for the tunnel is enabled through a first path. The data transfer is enabled by reserving resources in intermediate nodes in the first path between the source node and the destination node. Data transfer for the tunnel may be switched from the first path to a second path by reserving resources in intermediate nodes in the second path. If an intermediate node in the second path is shared by the second path and the first path, the resources reserved by the first path are shared by the second path. if an intermediate node in the second path is not shared by the first path, resources are reserved by the second path. After resources are reserved in the second path and data transfer is enabled in the second path, data transfer for the tunnel is switched to the second path.

Abstract: A method and corresponding network interface device for communicating between devices connected to a LAN includes attempting to communicate between the network devices over an initial subset of the network media wires. If the communication fails, a subsequent subset of media wires is selected. The wires of this subsequent subset differ from the wires of the initial subset. If the attempted communication succeeds, the current subset of network media wires is used as the media over which subsequent network data is transmitted. Attempting to communicate over the media may include sending an initialization sequence such as an Ethernet Auto-negotiate sequence. In one embodiment, the network media is implemented as 8 wires of CAT 5 cabling suitable for use with a Gigabit Ethernet. In this embodiment, any subsequent subsets of the network media wires may consist of 4 of the 8 wires over which 100 Mbps Ethernet operation may occur.

Abstract: A method for providing grades of service to unprotected traffic on an optical network that provides protection channels associated with working channels, defines a linearly ordered set of protection switch request priorities, and two or more grade of service priorities, and uses those priorities to enforce a protection access policy. The unprotected traffic may be of a high priority, approximating non-pre-emptable unprotected traffic (NUT); of low priority, like extra traffic; or may be of an intermediate priority between the two. This allows data transport providers to offer different unprotected transport services at different rates on protected links, in which the different unprotected transport services are associated with different probabilities of pre-emption.

Abstract: A method is disclosed to set the signaling rate of a switch domain disposed in an information storage and retrieval system. The method establishes a switch domain target operating speed, and determines if that switch domain target operating speed comprises a first signaling rate. If the switch domain target operating speed comprises a first signaling rate, then the method asserts first Device Control Code bits to each of the plurality of data storage devices, and each of the plurality of data storage devices communicates with the switch using that first signaling rate. If the switch domain target operating speed does not comprise the first signaling rate, then the method asserts second Device Control Code bits to each of the plurality of data storage devices, and each of the plurality of data storage devices communicates with the switch using a second signaling rate.

Abstract: In a statistic counter device comprising a plurality of statistic counters which count statistic information, in order to reduce a hardware scale and power consumption by dynamically controlling a bit number of the statistic counters, a counter management portion forms extension counters by dynamically linking standby counters to higher digits of base counters when the base counters reach the full count or a count before the full count by a fixed range, and releases the link when the extension counters are reset.

Abstract: When an externally received data frame is transmitted at a station of a ring-shaped packet communication network, a congestion point in the communication network is defined as a boundary point, a frame addressed to a station located before the boundary point is transmitted at a first transfer rate, and a frame addressed to a station located after the boundary point is transmitted at a second transfer rate lower than the first transfer rate.

Abstract: There is disclosed a method and controller for controlling an information flow in an acyclic data transmission system including receiving a plurality of data packets, and allocating a priority level for each data packet including a class of loss for the data packet and a class of urgency of service for the data packet. The method and controller also include servicing the data packets in accordance with the priority levels and outputting the data packets at a configured rate.

Abstract: Aspects of the invention utilize a secondary communication channel to conduct flow control at the word level. As a result, the overhead associated with flow control can be reduced, as well as the risk of buffer overflow. In one embodiment, embedded flow control information is encoded as reversed running disparity codes in each transmission lane. Additional control symbols may be coded by grouping a series of specially coded data words or inspecting a selected data word at regular intervals.

Abstract: A burst mode optical signal is transported as payload of a framed continuous bit-stream optical signal through an optical transport network. The optical bursts are all generated at a common nominal bitrate which equals substantially the payload bitrate of the continuous bit-stream optical signal. The bursts are converted into a continuous bit stream by filling gaps between the bursts with a predefined pattern. The continuous bit stream thus created is then mapped into frames to generate the framed continuous bit-stream optical signal for transmission.

Abstract: A method for ascertaining the use of resources on a network having multiple paths across which data can pass. Each alternative path across the network is provided with a different address or port at a server or anchor point, such that, when a data packet is sent to a particular address it will travel across a certain path. As each path is associated with its own individual port or address a server can deduce from the port or address at which a data packet arrives which path it has traversed. The server can then use its knowledge of network topology and bandwidth availability to make policy enforcement decisions. These decisions may include whether to allow the call to proceed if the initial packet received is a call set up packet or, alternatively, a decision as to which path should be used for all transmissions from the terminal during the session.

Abstract: In a wireless network or other communication system, admission of users to the system is based on predicted scheduling gain. A scheduler is configured to manage access to network resources for users already admitted to the system. An admission control module is coupled to the scheduler, and determines a predicted scheduling gain of the scheduler under an operating scenario involving admission of at least one additional user to the system. The predicted scheduling gain is processed to generate at least one performance metric which is used to make an admission control decision regarding admission of the at least one additional user to the system.

Abstract: Information can be transferred while ensuring real-time characteristics without increasing the circuit size of an apparatus. A high-order layer packet is divided into a plurality of fragmented packets of fragment numbers, and these are transmitted via a wireless network. When an error occurs, if within a maximum permissible transmission process time, the fragmented packet of the same fragment number is retransmitted. For the high-order packet, since all the fragmented packets thereof could not be transmitted within that time due to the error, a halt flag is written into the fragmented packet of the next high-order packet.

Abstract: Burst-switching nodes using a common-memory or a time shared space switch and employing flow-rate control are disclosed. Within a switching node, data bursts are segmented into data segments of a fixed size with some segments containing information bits as well as null bits. A switching node handles data streams allocated different flow rates and, for any data stream, the internal flow rate through the switching node can be higher than the external flow rate due to null padding of segmented data. The switching node is provided with a sufficient internal capacity expansion in order to offset the effect of null padding. A controller of the switching node is provided with a flow-rate-regulation apparatus to enable scheduling the transfer of data segments across the switching node in a manner that guarantees adherence to the allocated information flow rates.

Abstract: Improved systems and methods for processing data traveling in a network in an efficient manner are provided. In many network implementations input/output ports have one or a small number of bandwidths. These ports sometimes lead to higher bandwidth ports than the source or destination needs. A method and system are provided wherein some of the input and output ports are known to be underutilized. Only a relatively small number of output ports require a complicated merge scheduler that provides configurable data transmission “fairness” between input ports. Accordingly, a method and system are provided wherein preprocessing of input data reduces the cost of the merge circuits required at the outputs.

Abstract: A method for granular policing includes a novel policing architecture which evaluates an arriving cell's conformance by comparing the actual arrival characteristic against a family or a set of expected arrival curves. In embodiments of the present invention, expected arrival characteristics based on a connection service level agreement (SLA) are represented by a family of N arrival curves. The degree of non-conformance of a cell is evaluated by inspecting, which m arrival curves were violated and which N-m arrival curves were non-violated by the arriving cells. Subsequently in context of discard, non-conforming tagged cells are further prioritized based on their degree of non-conformance. Thus cells associated with a higher degree of non-conformance shall be discarded before cells with a relatively lower degree of non-conformance.

Abstract: A communication circuit comprises a plurality of receivers to receive the serial data from multiple lanes of a communication channel. The receivers may convert data received from the lanes from a serial to parallel format. Decoders may identify characters recovered from the different lanes, which collectively may define a word of width (i.e., character width) related to the number of lanes. Logic may determine when at least one of a start-of-frame and an end-of-frame character has been received. Parsing circuitry may then determine valid characters of a received word based on their placement relative to a start-of-frame character and/or an end-of-frame character. A controller may control when to present recovered data to at least one of storage registers or an output port, based on the character type identified by the decoder, its placement, an amount of characters parsed, and the number of characters already stored.

Abstract: A selective, flow-based datapath architecture is described. A Flow Control Block Manager (FCBM) is located in a flow-based datapath for selectively and intelligently processing packets in the Flow Path. If, according to the FCBM, efficiency gains can be achieved by creating a flow control block and employing flow-based processing on a packet stream, the packets are processed accordingly. If, however, insufficient gains are anticipated the packets are processed in a flow-unaware manner. The FCBM determines the manner in which to process packets based on a set of criteria.

Abstract: Disclosed is a method for handling inter-RAT cell measurement in a dual-mode UE in a connected mode, which supports both GSM/GPRS (Global System for Mobile communication/General Packet Radio Service) RAT (Radio Access Technology) and UMTS (Universal Mobile Telecommunications System) RAT. A UTRAN (UMTS Terrestrial Radio Access Network) of the UMTS RAT transmits a measurement control message to a URRC (UMTS Radio Resource Control) of a UMTS network layer in the UE. Upon receiving the measurement control message, the URRC sends a measurement request for GSM cells to an RR/GRR (Radio Resource/GPRS Radio Resource) of a GSM/GPRS network layer. The RR/GRR activates a GSM physical layer and sends a measurement request for the GSM cells to the GSM physical layer. The GSM physical layer performs measurement on the GSM cells and reports a measurement value to the RR/GRR. The RR/GRR reports the measurement value for GSM cells, received from the GSM physical layer, to the URRC.

Abstract: A method of operating a service provider network comprising selecting a first access network from a plurality of access networks, transmitting first traffic for a first service from a testing system in the service provider network to the first access network over a first virtual connection between the testing system and the first access network wherein the first traffic indicates a first subscriber of the first access network as the origin of the first traffic and the testing system as the destination of the first traffic, receiving second traffic for the first service into the testing system from the first access network over a first service connection wherein the second traffic indicates the first subscriber as the origin of the second traffic and the testing system as the destination of the second traffic, and processing the second traffic to test the first service.

Abstract: A system and method for subscriber tracking and creating subscriber records in a GPRS or UMTS network is disclosed. A local mapping record is created on a probe monitoring a Gi interface upon the detection of Access Start messages. Additional information is sent from a probe monitoring a Gn/Gp interface, and this information is added to the local mapping record. The processing of captured messages and the creation of local mapping record is prioritized to ensure that records for different subscribers who used the same IP address are not improperly combined. Finally, Gi traffic is tagged with unique subscriber information, such as the International Mobile Subscriber Identity (IMSI), not previously present on the Gi network.

Abstract: The present invention relates to a method for communication network parameter setting comprising the steps of a) acquiring and storing information related to a1) service requests issued by terminals attached to the network, a2) positions of the terminals, and a3) establishment of the requested service for the terminals, b) matching, based on the position information, the information to a grid of unit areas, the grid of unit areas representing a geographical region in which the network is operated, c) processing the information per unit area, d) outputting the processed information and e) modifying communication network operating parameters based on the outputted processed information.

Abstract: A method and apparatus for voice path assurance (VPA) testing in a packet network such as an Internet Protocol (IP) network is provided. More specifically, the invention relates to a voice path assurance (VPA) testing technique that is initiated by the terminating side of a logical connection through an IP network. The technique of the present invention is used to verify connectivity and performance—during a call set-up procedure—between the terminating endpoint and the originating endpoint of the logical connection through the IP network.

Abstract: The present invention provides for discovering diagnostic port functionality in a distributed system. A computer system requests network addresses for one or more chassis. A chassis receives the request for a network address and returns a corresponding network address at least for the chassis. The computer system receives one or more network addresses corresponding to the one or more chassis. The computer system requests resource data from each of the one or more corresponding network addresses. The chassis receives the request for resource data and returns resource data representing at least the current configuration of the chassis to the requesting computer system. The computer system receives resource data representing the configuration of the one or more chassis. The computer system presents the received resource data at the requesting computer system.

Abstract: An information-processing device for communicating with a communication device includes a RTT measurement unit configured to measure a round trip time between the information-processing device and the communication device, a RTT judgment unit configured to determine whether the round trip time exceeds a predetermined upper limit value, a unit-type information acquiring unit configured to acquire an identification of the communication device when the round trip time is not greater than the upper limit value, a limit value judgment unit configured to measure amount of cumulative information accumulated during content is transmitted to the communication device, a cumulative information storage unit configured to store the measured amount of cumulative information, and a cumulative information management unit configured to control to store the cumulative information in the cumulative information storage unit when the amount of cumulative information exceeds a given limit value.

Abstract: In a communications network, which may be a federated network such as the Internet, a tariff is distributed via the network to customer terminals. At each terminal a charge for use of the network is calculated by using the tariff. Different tariffs may be communicated for different services and a respective tariff may be varied depending upon the operational condition of the service. Different tariffs may be calculated for different customers and the tariffs may be varied in dependence upon the loading of network resources and different tariffs may have different volatilities. Part of the traffic from a user to the network may be sampled and the status of the user may be amended when a discrepancy is detected between the sampled parameters and the contracted parameters in the users contract.

Abstract: A method of device management relating to communication technology, wherein the method comprises the following steps of: the device initiatively sending a IP packet for management registration request to a management system according to address information of the management system, the request packet at least comprising the unique device identifier and IP address of the device; after the management system receiving registration request of the device, judging whether this device is legal or not according the unique device identifier, if it is, accepting the registration, otherwise rejecting.

Abstract: A method assigns addresses to nodes in a wireless network. An address space is defined as an n-dimensional grid. Each grid intersection has coordinates of a corresponding possible node of a wireless network. A number of components of each coordinate is equal to a dimensionality of the grid, and the coordinates form a logical address of the corresponding node. A parent node assigns an unallocated logical address as a child node address to a child node joining the wireless network such that one component of the child node address is one larger than a corresponding component of the parent node.

Abstract: A method and apparatus for configuring a network interface to support a virtual private network includes storing configuration data at a server on a host computer on the provider network. It is determined whether conditions are satisfied for sending the configuration data to a particular node at an edge of the provider network. If it is determined that conditions are satisfied, then the configuration data is sent to the particular node to cause the particular node to configure a particular interface for supporting a virtual private network over the provider network based on the configuration data without human intervention. The provider network is a packet-switched network and the particular virtual private network is a link layer virtual private network. The particular node is different from the host. The particular interface is for a direct communication link to a customer network node outside the provider network.

Abstract: A method for transmitting data from a participant device in a session in an Internet Protocol (IP) system (100) is provided. The method comprises sending (405) one or more a first Real-time Transport Protocol (RTP) packet of the session to a first address. The method further comprises sending (410) one or more a first Real-time Transport Control Protocol (RTCP) packet of the session to a second address. The participant device sends the one or more a first RTP packet and the one or more a first RTCP packet.

Abstract: An apparatus and method for block acknowledgements with reduced recipient state information are described. In one embodiment, the method comprises the storing of a receive state for a block of frames received during a transmission opportunity (TXOP) with an on-chip state memory. Once stored, an immediate block acknowledgement, including the receive state information, may be transmitted to an originator according to a block acknowledgement request (BAR) received during the TXOP. In the embodiments described, the BAR is received during the TXOP in which the block of data frames were transmitted to a recipient. In one embodiment, the recipient is free to discard the receive state information to free space within the on-chip system memory by requiring the originator to maintain the receive state information of blocks of data frames transmitted during TXOPs. Other embodiments are described and claimed.

Abstract: The present invention relates to a method and apparatus for detecting voice activity in a communication signal, wherein filter means are provided for estimating or suppressing an offset component of the level of the communication signal. A filter parameter is controlled based on the output of the filter means. Furthermore, the estimation or suppression of the offset component is limited in response to the output of the filter means. The filter means may be based on a non-linear adaptive notch level filter or a noise floor tracking filter. Thereby, the tracking behavior of noise floor estimation to sudden rises in noise floor can be improved and the voice activity detection can work efficiently over a wide dynamic range.

Abstract: Disclosed is a method for transmitting a pilot symbol from base stations (BSs) to a subscriber station (SS) in a communication system which includes the base stations located adjacent to each other, the method includes the steps of transmitting BS-identifying sub-carriers which represent sequences for identifying the base stations in a frequency domain of the pilot symbol; and transmitting PAPR (Peak to Average Power Ratio) sub-carriers which represent sequences for reducing a PAPR of the pilot symbol together with the transmission of the BS-identifying sub-carriers in the frequency domain.

Abstract: Systems and methods for establishing IT services in edge environments are described. The system comprises a transportable housing capable of being carried by personnel, a plurality of commercial off-the-shelf components contained in the housing and coupled together and configured to provide the broadband communications network, a software management system operatively coupled to the plurality of components, a network connection subsystem defined by at least a first portion of the plurality of components and configured to establish access to the broadband communications network, and a connection subsystem defined by at least a second portion of the plurality of components and that provides a user with a connection to the broadband communications network via the network connection subsystem.

Abstract: This invention describes a novel digital broadcast modulation scheme to provide wide area coverage at a high bit rate from a single transmitter. The scheme creates an additional dimension within which to create transmission channels besides those of time, code, direction and frequency. Advantages of scheme include lower power to deliver the same total bit rate to an area, wider coverage using the same power, and closer spacing of transmitters sharing the same frequencies. It is particularly well suited to supporting broadcast of data to a large population of users.

Abstract: Provided is a method and system for transmitting MPEG frames between a DOCSIS based satellite modem termination system (SMTS) and a corresponding satellite modem (SM) system. The method includes identifying at least one data stream requiring transmission between the SMTS and the SM, the data stream including one or more MPEG frames. Next, the MPEG frames are organized within SMTS data queues based upon predetermined parameters and then transmitted based upon their organization within the data queues.

Abstract: A CDMA radio receiving apparatus which receives a slot which has a long code group identification short code at a point where a long code is masked. The apparatus includes a detector that detects a phase of the long code in association with a pattern that appears over successive slots and comprises the long code group identification short code. The apparatus also includes a correlator that performs correlation processing in association with the phase detected by the detector to identify the long code.

Abstract: A system and method for remotely controlling an increased number of subsystems having an onboard locomotive control unit (LCU) and two associated operator control units (OCUs) on a single wireless channel. A time slot is assigned to each subsystem for making two-way transmissions to control the locomotive. A signal from an external timing source synchronizes each subsystem to minimize interference between transmissions from different subsystems. Time slots are assigned manually or automatically over a wireless network or by the LCU after monitoring the channel. The LCU automatically selects the direct or repeater transmission path depending upon whether or not it receives polling message responses from its associated OCUs. A GPS receiver in each subsystem receives the synchronization signal and provides geographic positioning data so the LCU can determine when to execute predefined, position-based commands. The secondary OCU may be turned off and rejoined to the subsystem without ceasing operation.

Abstract: A method and apparatus for deploying new technology such as MIMO transmission technology in a geographically distributed network such as a telecommunications network is provided. In one embodiment, the invention is a method of installing new technology in an existing geographically distributed network. The method includes dedicating network resources of the geographically distributed network for the new technology to produce dedicated network resources of the geographically distributed network. The method also includes installing a component for the new technology at a centralized network facility of the geographically distributed network. Moreover, the method includes coupling the dedicated network resources of the geographically distributed network to the component. The method may further include installing subscriber equipment at subscriber sites. The new technology may be MIMO transmission technology.

Abstract: The present invention relates to a system and method for extending the coverage area and communication capacity of a spread-spectrum based wireless network. The system comprises a unique dual-scale, asymmetrical cellular architecture for a wireless network, wherein the communication uplink is based on a macro-cellular system, and the communication downlink is based on a micro-cellular system. Through the user of remote downlink transmitters in the micro-cellular system, the present invention provides a cost effective solution for increasing communication capacity, extending coverage area, and providing high-speed communication downlink.

Abstract: An assembly, and an associated method, for an ad hoc network, such as an independent basic service set defined in an IEEE 802.11 protocol specification. A channel map is created and maintained at each mobile station of the ad hoc network. The channel map is populated with channel characteristic indicia of channel frequencies that might be available upon which to be used in the ad hoc network to effectuate communications between the mobile stations. Information related to the channel map created and maintained at each of the mobile stations is exchanged, and any of the mobile stations is selectable to form a DFS owner that defines the channel frequency to be used upon which to define a communication channel for communications in the network.

Abstract: A mobile communication system and method utilizing Orthogonal Frequency Division Multiplexing (OFDM) receives channel quality information (CQIs) for subcarriers through which reference signals are transmitted and subcarriers through which data signals are transmitted, in subbands, each including a predetermined number of subcarriers among a plurality of the subcarriers. The CQIs are received from respective receivers. Resources are dynamically assigned to the respective receivers according to the feedback CQIs, thereby enabling dynamic resource assignment with minimized signaling overhead.