Abstract: An apparatus and method for determining a beamforming vector in a codebook-based transmission beamforming system are provided. In a feedback method for a receiver in a codebook-based transmission beamforming system, forthcoming channel values for a forthcoming period are generated using M present and previous channel estimates. Effective channel gains for all transmission beamforming vectors included in a codebook are calculated using the forthcoming channel values. A codebook index corresponding to the maximum effective channel gains is fed back to a transmitter.

Abstract: In a cell of a cellular wireless communication system, the SIR of at least one user in a sector of the cell is increased by temporarily reducing transmissions on a forward link in at least one other sector of the cell or a sector in another cell in accordance with a pattern.

Abstract: In a radio access network, the reverse link rate of an access terminal is controlled and stabilized by determining a number of connections in one or more sectors in which the access terminal has a connection and setting a rate limit based on at least one of the determined number of connections. The number of connections can be determined for each sector in which the access terminal has a connection or for some subset of these sectors. If the number of connections is determined for more than one sector, the radio access network may limit the reverse link rate based on the sector having the greatest number of connections.

Abstract: In a radio access network, the reverse link rate of an access terminal is controlled and stabilized by determining a number of connections in one or more sectors in which the access terminal has a connection and setting a rate limit based on at least one of the determined number of connections. The number of connections can be determined for each sector in which the access terminal has a connection or for some subset of these sectors. If the number of connections is determined for more than one sector, the radio access network may limit the reverse link rate based on the sector having the greatest number of connections.

Abstract: A method of cooperative multi-antenna communication between a base station and node existing in a wireless network is provided. A cooperative multi-antenna communication method includes receiving data from at least one node of a node group that receives data from a base station, performing multiple input multiple output (MIMO) signal processing with respect to the received data, the MIMO signal processing indicating signal processing performed in a receiving end of a MIMO system, and transmitting the signal processed data to at least one target node.

Abstract: In a cell of a cellular wireless communication system, the SIR of at least one user in a sector of the cell is altered by temporarily reducing transmissions on a forward link in at least one other sector of the cell or a sector in another cell in accordance with a pattern.

Abstract: In a radio access network (e.g., a cellular network), a radio node is configured to monitor one or more characteristics of a stream of data packets destined for an access terminal (e.g., a cellular telephone, laptop computer, etc.) to determine whether there is congestion in a network supplying the stream of data packets. If the radio node detects congestion, the radio node transmits a congestion alert to another device to cause the rate at which data enters the network to be slowed. The rate may be slowed either directly (e.g., by an upstream device which slows the rate at which the upstream device supplies the data to the network) or indirectly (e.g., by a downstream device which requests a slower delivery of data from the radio node).

Abstract: In a cell of a cellular wireless communication system, the SIR of at least one user in a sector of the cell is altered by temporarily reducing transmissions on a forward link in at least one other sector of the cell or a sector in another cell in accordance with a pattern.

Abstract: A method and apparatus for transmitting signals in a multi-hop wireless communication system are provided. A first BS transmits a signal including a first common information codeword and a first private information codeword. A second BS transmits a signal including a second common information codeword and a second private information codeword. A first RS joint-decodes the first common information codeword and the second common information codeword and decodes the first private information codeword. A second RS joint-decodes the first common information codeword and the second common information codeword and decodes the second private information codeword.

Abstract: A method of setting a packet transmission path in a wireless communication network and a network apparatus using the same are provided. A method of setting a packet transmission path includes setting N?1 routing regions including at least one node between a source node and a destination node based on a predetermined N number of hops, N denoting an integer greater than or equal to two, and determining a node in each of the routing regions as a relay node based on a channel gain.

Abstract: In a cellular network, randomness is introduced into a transmitted signal at each transmitter, and the resulting received signal, which is the sum of all received signals, fluctuates more in time than a signal transmitted without the introduced randomness. While the introduction of randomness can diminish reception of some parts of the signal at the receiver, the transmitted signal can be encoded using forward error correction coding techniques, which allows the receiver to recover all of the signal information despite some diminished reception. Such randomization provides time diversity so that receivers can have more consistent performance. For broadcasted data, where users with the worst channel condition dictates the overall performance, having consistent performance across users can improve the overall network performance.

Abstract: An apparatus and method for cooperative relay in a multiple-antenna wireless communication system based on relay stations (RSs) are provided. The apparatus includes a serial/parallel converter for dividing data into N number of streams, a channel estimator for calculating a first transmission rate at which a RS performing the cooperative relay can perform decoding and a second transmission rate at which all relay stations performing the cooperative relay can commonly perform decoding, and determining transmission rates for each of the N-number streams, and an adaptive modulation and coding (AMC) unit for encoding and modulating the N-number streams according to their respective transmission rates.

Abstract: Disclosed is a data transmission/reception method and system for minimizing intercarrier interference (ICI) in a communication system using a multicarrier. The data transmission method by a transmitter includes grouping transmission signals in units of a predetermined number of transmission signals when the transmitter has received the transmission signals, multiplying each group of the transmission signals by a transmission coding matrix, and transmitting the transmission signals multiplied by the transmission coding matrix to a receiver.

Abstract: An apparatus and method for downlink scheduling in a multi antenna wireless communication system are provided. The apparatus includes a receiver for receiving channel information of at least one mobile station that is selected as an active user by a base station, a judgment unit for judging whether it feeds back its own channel information using the channel information of the selected at least one mobile station, and a transmitter for transmitting the its own channel information to the base station according to judgment of the judgment unit.

Abstract: An apparatus and method for determining a beamforming vector in a codebook-based transmission beamforming system are provided. In a feedback method for a receiver in a codebook-based transmission beamforming system, forthcoming channel values for a forthcoming period are generated using M present and previous channel estimates. Effective channel gains for all transmission beamforming vectors included in a codebook are calculated using the forthcoming channel values. A codebook index corresponding to the maximum effective channel gains is fed back to a transmitter.

Abstract: Techniques for transmitting encoded data packets to one or more mobile stations in a communication system including a cell that has sectors serving at least partially different geographic areas. The techniques include transmitting in a first sector an encoded data packet in one or more time slots to a mobile station; reducing transmission power in a second sector during one or more of the time slots in which the first sector transmits the data packet to the mobile station; decoding at the mobile station the encoded data packet after each time slot; transmitting by the mobile station a signal indicating acknowledgment of the packet reception when the decoding of the packet is successful; and in response to receiving the acknowledgement signal, ceasing transmission of the data packet in the first sector in subsequent time slots.

Abstract: Capacity enhancement schemes are described for forward and reverse links of distributed cellular base stations consisting of a central unit and one or more remote units. In general, in one aspect, reverse link capacity is shared among remote units. The capacity sharing can be determined dynamically. The forward link capacity can also be enhanced by estimating the location of the mobile stations.

Abstract: Techniques for multilevel coding of a stream of information bits in a communication system. The stream of information bits is separated into portions, and each of the portions is associated with a different level of the multilevel coding. At least one code is applied to the portion of the information bits of each level in a designated subset of the full set of levels, such that the portions of the information bits for levels in the designated subset are coded while the portions of the information bits for levels not in the designated subset are uncoded. Both the coded portions of the information bits and the uncoded portions of the information bits are used to select modulation symbols for transmission in the system. Advantageously, the invention provides improved coding gain relative to conventional techniques, and can be configured to provide unequal error protection as well as time diversity for transmissions in the system.

Abstract: In a radio access network, the reverse link rate of an access terminal is controlled and stabilized by determining a number of connections in one or more sectors in which the access terminal has a connection and setting a rate limit based on at least one of the determined number of connections. The number of connections can be determined for each sector in which the access terminal has a connection or for some subset of these sectors. If the number of connections is determined for more than one sector, the radio access network may limit the reverse link rate based on the sector having the greatest number of connections.

Abstract: In a radio access network (e.g., a cellular network), a radio node is configured to monitor one or more characteristics of a stream of data packets destined for an access terminal (e.g., a cellular telephone, laptop computer, etc.) to determine whether there is congestion in a network supplying the stream of data packets. If the radio node detects congestion, the radio node transmits a congestion alert to another device to cause the rate at which data enters the network to be slowed. The rate may be slowed either directly (e.g., by an upstream device which slows the rate at which the upstream device supplies the data to the network) or indirectly (e.g., by a downstream device which requests a slower delivery of data from the radio node).