Techniques to process data for transmission over a set of transmission channels selected from among all available transmission channels. In an aspect, the data processing includes coding data based on a common coding and modulation scheme to provide modulation symbols and pre-weighting the modulation symbols for each selected channel based on the channel's characteristics. The pre-weighting may be achieved by “inverting” the selected channels so that the received SNRs are approximately similar for all selected channels. With selective channel inversion, only channels having SNRs at or above a particular threshold are selected, “bad” channels are not used, and the total available transmit power is distributed across only “good” channels. Improved performance is achieved due to the combined benefits of using only the NS best channels and matching the received SNR of each selected channel to the SNR required by the selected coding and modulation scheme.

Method and apparatus for processing data for transmission in a multi-channel communication system using selective channel inversion

The object is achieved by providing a base station apparatus for performing time and frequency scheduling in uplink packet access with: an interference amount measurement part configured to measure an uplink interference amount for each interference amount measurement unit which comprises a predetermined period and a predetermined number of frequency blocks; an interference amount determination part configured to determine whether the uplink interference amount satisfies a predetermined condition; and an overload indicator reporting part configured to report an overload indicator to a neighboring cell when the predetermined condition is satisfied.

Base station apparatus and communication control method

Provided are a radio transmission device and a radio transmission method capable of improving downlink and uplink throughput even when performing dynamic symbol allocation. In the device and the method, BS and MS share a table correlating a basic TF as a combination of parameters such as TB size used for transmitting only user data, an allocation RB quantity, a modulation method, and an encoding ratio, with a derived TF having user data of different TB size by combining L1/L2 control information. Even when multiplexing L1/L2 control information, Index corresponding to the basic TF is reported from BS to MS.

Radio transmission device and radio transmission method

A method and apparatus for subcarrier selection for systems is described. In one embodiment, a method for subcarrier for a system employing orthogonal frequency division multiple access (OFDMA) comprises partitioning subcarriers (101) into groups of at least one cluster of subcarriers (102), receiving an indication of a selection by the subscriber of one or more groups (103) in the groups, and allocating at least one cluster in the one or more groups of clusters selected by the subcarrier for use in communication with the subscriber (104, 105).

Multi-carrier communications with group-based subcarrier allocation

Coding techniques for a (e.g., OFDM) communication system capable of transmitting data on a number of “transmission channels” at different information bit rates based on the channels' achieved SNR. A base code is used in combination with common or variable puncturing to achieve different coding rates required by the transmission channels. The data (i.e., information bits) for a data transmission is encoded with the base code, and the coded bits for each channel (or group of channels with the similar transmission capabilities) are punctured to achieve the required coding rate. The coded bits may be interleaved (e.g., to combat fading and remove correlation between coded bits in each modulation symbol) prior to puncturing. The unpunctured coded bits are grouped into non-binary symbols and mapped to modulation symbols (e.g., using Gray mapping). The modulation symbol may be “pre-conditioned” and prior to transmission.

Coding scheme for a wireless communication system

A method and apparatus for allocating subcarriers in an orthogonal frequency division multiple access (OFDMA) system is described. In one embodiment, the method comprises allocating at least one diversity cluster of subcarriers to a first subscriber and allocating at least one coherence cluster to a second subscriber.

Ofdma with adaptive subcarrier-cluster configuration and selective loading

PROBLEM TO BE SOLVED: To provide a method and a device for allocating a subcarrier in an orthogonal frequency division multiple access (OFDMA) system.SOLUTION: In an embodiment, this method comprises: a step for allocating at least one diversity cluster of a subcarrier to a first subscriber; and a step for allocating at least one coherence cluster to a second subscriber.

Adaptive cluster configuration and multiple carrier communication by switching

A method and apparatus for subcarrier selection for systems is described. In one embodiment, the system employs orthogonal frequency division multiple access (OFDMA). In one embodiment, a method for subcarrier selection compreses each of multiple subscribes measuring channel and interference information for subcarriers based on pilot symbols received from a base station, at least one of subscribers selecting a set of candidate subcarriers, providing feedback information on the set of candidate subcarriers to the base station, andthe one subscriber receiving an indicaiton of subcarriers to the base station, and the one subscriber receiving an indication of subcarriers of the set of subcarriers selected bz the base station for use by the one subscriber.

Method and apparatus for subcarrier selection, method for reducing interval interference and OFDMA system

The invention discloses a method and a device for selecting subcarriers in a system using OFDMA. The method comprises that user equipment measures channel and interference information of subcarrier clusters according to pilot symbols that are received from a base station, wherein the subcarrier clusters comprise more than one subcarrier; the user equipment selects any set of candidate clusters according to the signal-to-noise + interference ratio (SNIR); the user equipment provides feedback information to the base station, wherein the feedback information comprises any sequence of the set of candidate clusters and comprises the index indication of each candidate cluster with an SINR value; the user equipment receives, from the base station, the allocation of one or more clusters that the base station selects from the set of candidate clusters for the user equipment to use; the user equipment provides new feedback information after the one or more clusters are allocated by the base station; and the user equipment receives, from the base station, the new allocation of one or more clusters.

Method and device for selecting subcarriers in a system using OFDMA

The invention disclsoes a method and a base station. The method comprises the following steps: transmitting, at a first time by a base station, at least a first pilot symbol to a subscriber unit for measuring the at least a first pilot symbol and obtaining first channel and interference information for a plurality of orthogonal frequency division multiple access (OFDMA) subcarriers; receiving, by the base station from the subscriber unit, after the transmitting of the at least first pilot symbol to the subscriber unit, first feedback of channel and interference information relating to a plurality of clusters, each cluster of the plurality of clusters having at least two OFDMA subcarriers of the plurality of OFDMA subcarriers, the receiving of the first feedback of channel and interference information includes receiving first indications of modulation and coding rates associated with each cluster of the plurality of clusters; transmitting, by the base station to the subscriber unit, a first allocation of OFDMA subcarriers of the plurality of OFDMA subcarriers selected by the base station for use by the subscriber unit; transmitting, at a second time after the first time, by the base station, at least a second pilot symbol to the subscriber unit for measuring the at least second pilot symbol and obtaining second channel and interference information for the plurality of OFDMA subcarriers;receiving, by the base station from the subscriber unit; transmitting, by the base station to the subscriber unit, a second based on at least the receiving of the second feedback.

Liu Hui

Papers

Ofdma with adaptive subcarrier-cluster configuration and selective loading

Adaptive cluster configuration and multiple carrier communication by switching

Method and apparatus for subcarrier selection, method for reducing interval interference and OFDMA system

Method and device for selecting subcarriers in a system using OFDMA

Method and base station