Nec Corporation

Lenovo Innovations Limited

Thanh Ngoc Bui

Dobrica Vasic

Kevin Lin

Satha Sathananthan

Holly He

Allen Yuan

Jiun Siew

Xinhua Wang

Tao Lin

The invention provides for a method of identifying a cyclic prefix to UEs in an OFDM communication system. The cyclic prefix has a dynamically variable length. The method includes, within an OFDM cell, transmitting MCCH scheduling information in a system information block in an OFDM broadcast channel, and using the MCCH scheduling information to receive the MCCH, wherein the MCCH contains MTCH scheduling information to indicate to the UE which sub-frame carries MTCH.

Transmission of MBMS in an OFDM communication system

In a method of transmitting a logical channel by using a downlink transport channel, a plurality of transmission configurations are limited into a limited set of the transmission configurations. Control information relating to the limited set of the transmission configurations of the downlink transport channel is transmitted and at least a part of data of the logical channel is transmitted over the downlink transport channel. Thus, an amount of the control information is reduced.

Method of transmitting control information

The present invention relates to methods that can be used in a wireless communication system, and systems adapted to use such methods. In a preferred form the methods are useful in channel estimation in a wireless communication system using orthogonal frequency division multiplexing (OFDM). The system is provided with a control block to optimize channel estimation.

Methods relating to channel estimation

In a method of transmitting control channel symbols in an OFDM communication system downlink in each sub-frame, the OFDM communication system including one or more transmit antennae, for each transmit antenna, each of the OFDM symbols of a control channel which are to be transmitted over the air is mapped to each of the corresponding non-punctured logical resource elements of one virtual control resource block VCRB. For each transmit antenna, the logical resource elements in each virtual control resource block VCRBare mapped to physical resource elements in each of the first L OFDM symbols so that the physical resource elements are uniformly spaced over the entire transmission bandwidth. For each transmit antenna, the physical resource elements are transmitted to user equipment.

Method of transmitting control channel information in an OFDM communication system downlink

Method and apparatus for channel estimation in OFDM

In a wideband communication system including a transmitter and a plurality of mobile terminals (MT) that have maximum reception bandwidths, respectively, a Shared Control Channel (SCCH) for each MT is mapped so that physical channel symbols from the corresponding Physical Shared Control Channels (PSCCH) are confined to a block of consecutive sub-carriers defined by a smallest one of the maximum reception bandwidths.

Method of physical resource management in a wideband communication system

A method of conducting soft combining of at least two received MBMS signals in a user equipment () of a radio telecommunications network (), the method including: demodulating () at least a subset of the received MBMS signals; converting (---) a floating point slot data vector to a fixed point slot data vector for each demodulated received MBMS signal; and soft combining () the fixed-point slot data vectors derived from at least two of said received MBMS signals.

MBMS soft combining

A method of calculating at least one soft bit corresponding to a data symbol received by a radio receiver is described. In one form the method () includes, calculating an average amplitude at least one received data symbol. The method also includes calculating () at least one threshold amplitude in respect of the data symbol on the basis of the calculated average amplitude. Next a subset of constellation symbols is determined () at least partly on the basis of the at least one threshold, and for which a distance determination will be made. The distance between the position of the data symbol and each of the symbols in the subset of constellation symbols is determined () and then a soft bit corresponding to the received symbol is calculated () on the basis of said determined distances.

Demodulation method

A receiver in which computation is simplified can be obtained by using a common factor for filter coefficients of FIR filters corresponding to a plurality of transmitting antennas and by using only the middle column of an inverse matrix of a gain matrix when the common factor is computed.

Receiver

A method of operating a radio telecommunications network including, a plurality of base transceiver stations (BTSs) each transmitting on a respective transmission bandwidth, and one or more mobile terminals (MTs) each having a respective maximum reception bandwidth, defining a common multicast frequency band within the transmission bandwidth of at least a first group of BTSs of the network on which the multicast service is to be transmitted; transmitting a multicast service in the common multicast frequency band from each BTS within the first group of BTSs; and enabling each base station having a bandwidth greater than the width of the common multicast frequency band to transmit a uni-cast service in portion of its transmission bandwidth falling outside the multicast frequency band.

Delivery of multicast and uni-cast services in an OFDMA system

A method of performing data equalization in a communication receiver with transmit and receive diversity includes (a) for each i-th receiver antenna and j-th transmitter antenna, calculating a channel response matrix Hfrom multi-path channel estimates, (b) each i-th receiver antenna, calculating a channel gain matrix Gfrom the channel response matrices Hand a scalar noise factor &#x3b2;, (c) calculating the middle column cof G, (d) calculating a filter coefficient vector wfrom the middle column cof Gof and the Hermitian transpose Hof the corresponding channel response matrices H, (e) filtering input data rreceived at each i-th receiver antenna with the corresponding filter coefficient vectors w, (f) despreading the filtered input data from each i-th receiver antenna, (g) applying phase compensation to the despread data, and (h) combining the despread data from all antennas to obtain received equalized data.

Data equalisation in a communication receiver wth transmit and receive diversity

A method for calculating filter coefficients for an equalizer in a communication receiver, the method including the steps of calculating () channel response matrices G and H from channel estimation inputs; performing () a Cholesky decomposition of the channel response matrix G into a lower triangular matrix L and an upper triangular matrix U; performing () forward substitution on the lower triangular matrix L to calculate a column vector d; performing () backward substitution on the column vector d and the Hermitian transpose Lof the lower triangular matrix L to calculate a middle column cof the inverse Gof the channel response matrix G; and calculating () the filter coefficients from the middle column cof the inverse channel response matrix Gand the Hermitian transpose Hof the response matrix H.

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Thanh Ngoc Bui