Abstract: Physical layer structures and access schemes for use in such networks are described and in particular initial access channel (IACH) structures are proposed. A spectrum efficient downlink (DL) IACH design supports different types of User Equipment (UE) capabilities and different system bandwidths. An IACH includes the synchronization channel (SCH) and broadcast-control channel (BCH). A non-uniform SCH for all system bandwidths is provided, as well as scalable bandwidth BCH depending on system bandwidth. An initial access procedure is provided, as well as an access procedure.

Abstract: The present invention provides methods and devices for mitigating inter-cell interference in communication environments having a plurality of cells. In some embodiments, a time-frequency transmission resource that includes multiple sub-carriers over multiple OFDM symbol intervals is partitioned into a first zone and a second zone. In the first zone, transmissions are transmitted on at least one frequency sub-band which is common to all of the plurality of cells. In the second zone, transmissions are transmitted on at least one frequency sub-band which is used by less than all of the plurality of cells, so as to mitigate inter-cell interference. In some embodiments, in the first zone transmissions are transmitted using a transmission power which is common to all of the plurality of cells and in the second zone transmissions are transmitted using a transmission power which is used by less than all of the plurality of cells so as to mitigate inter-cell interference.

Abstract: A method and system for wireless frequency division multiple access communications in the uplink and/or downlink directions, having an improved pilot insertion scheme for single carrier based communications is provided. A first time duration for transmission of a data payload block (7) is established, and the transmission is processed using a first frequency domain or a time domain. A second time duration for transmission of at least one pilot block (70) is established, and the transmission is processed using a second frequency domain or the time domain, the second time duration (70) is not greater than the first time duration (7).

Abstract: The digital symbols of a sequence are assigned to respective positions in successive timeslots, according to a predetermined slot format. In a plurality of timeslots, a symbol of the sequence is replaced by a substitution symbol carrying additional information. A signal representing the sequence of symbols, which is divided into the timeslots, is transmitted on a communication channel. The production of the sequence includes an interleaving having an interleaving period longer than a timeslot, generally performed after a channel coding. The position of the substitution symbols in the timeslots which include them is varied, in order to optimize the performances of the transmission chain.

Abstract: The invention concerns a method which consists in allocating to a base station, at a control member of the base station, a list of channels shared by several terminals containing several sets of shared channels. For a communication session between the base station and a specific terminal, it consists in indicating to the terminal the list of shared channels allocated to the base station. At the base station, it consists in selecting for the terminal one of the sets of shared channels, and independently of the control member, indicating the selected set to the terminal via a dedicated channel.

Abstract: A scheme for multiplexing transport channels on one or several communication channels is used to operate in a normal mode and in a compressed mode which requires a lower symbol rate to provide in active periods in the communication channels. To match the symbol rate on each of the transport channels, a symbol puncturing is performed in two passes: marked symbols are introduced and are subjected, along with the other information symbols, to different operations including an interleaving, before being deleted from the transmitted sequence. Accordingly, those operations can be performed in the same manner in the normal and compressed modes, which limits the complexity of the communicating entities.

Abstract: A scheme for multiplexing transport channels on one or several communication channels is used to operate in a normal mode and in a compressed mode which requires a lower symbol rate to provide in active periods in the communication channels. To match the symbol rate on each of the transport channels, a symbol puncturing is performed in two passes: marked symbols are introduced and are subjected, along with the other information symbols, to different operations including an interleaving, before being deleted from the transmitted sequence. Accordingly, those operations can be performed in the same manner in the normal and compressed modes, which limits the complexity of the communicating entities.

Abstract: A preamble for a reverse access channel (RACH) of a CDMA (code division multiple access) communications system comprises a pair of constituent Golay sequences A and B concatenated with at least one pair, and preferably a plurality of different pairs, of transformed sequences which are also constituent Golay sequences, each pair of transformed sequences comprising a permutation of elements of the pair of sequences A and B. The permutations can include a reversed order of elements in the sequences, a reversed order of some or all of a set of address bits identifying locations of elements in the sequences, a concatenation of subsets of elements in odd and even locations of the sequences A and B, and combinations of these permutations. A method for providing the preamble, and related apparatus using a bidirectional counter and an address permutation unit, are described.

Abstract: Transcoder apparatus is designed to transcode a receive signal (UR) into a transmit signal (UE). For this purpose, it includes a signaling transmitting member (14) for producing a signaling message and for introducing it into the transmit signal by stealing bits from said signal. According to the invention, the signaling transmitter member (14) also comprises a tone generator (15) to add a tone signal (UTS) to the transmit signal (UE) prior to applying the signaling message to said transmit signal.

Abstract: The digital symbols of a sequence are assigned to respective positions in successive timeslots, according to a predetermined slot format. In a plurality of timeslots, a symbol of the sequence is replaced by a substitution symbol carrying additional information. A signal representing the sequence of symbols, which is divided into the timeslots, is transmitted on a communication channel. The production of the sequence includes an interleaving having an interleaving period longer than a timeslot, generally performed after a channel coding. The position of the substitution symbols in the timeslots which include them is varied, in order to optimize the performances of the transmission chain.

Abstract: A mobile radio system enables exchange of bidirectional digital signals between at least one mobile station and at least one base transceiver station and provides at least two coding modes, each mode corresponding to a predetermined source code and a predetermined channel code for the transmission of a wanted signal for each transmission direction. Each source code corresponds to a given user bit rate and each channel code corresponds to a given coding efficiency and therefore to a given total bit rate for a given source code. For adaptation of the air interface of this system, at the time of a call between a mobile station and a base transceiver station, two separate analyses of transmission quality are carried out for each transmission direction, respectively, and, for each transmission direction, one of the coding modes is selected in accordance with the corresponding transmission quality analysis.

Abstract: The present invention provides an automated retransmission request-based system wherein packets are continuously transmitted from a transmitter to a receiver. During reception, the receiver will send either an acknowledgement (ACK) or a negative-acknowledgement (NAK) to the transmitter, depending on whether or not the corresponding packet was properly received. In response to the NAKs, the transmitter will identify the packet that was not properly received, which is referred to as the packet for retransmission. The transmitter will divide the packet for retransmission into multiple subpackets, and puncture each subpacket into a packet in the sequence of packets being transmitted to the receiver. The receiver will recover the subpackets from the punctured packets and will recreate the packet for retransmission from the recovered subpackets.

Abstract: A channel selector device for a multiple access system of direct transmission between mobile stations carries out measurements on various channels during calls in order to determine if there is a better channel than the traffic channel used for the call. This better channel constitutes the new traffic channel to be-used.

Abstract: A mobile radio system enables exchange of bidirectional digital signals between at least one mobile station and at least one base transceiver station and provides at least two coding modes, each mode corresponding to a predetermined source code and a predetermined channel code for the transmission of a wanted signal for each transmission direction. Each source code corresponds to a given user bit rate and each channel code corresponds to a given coding efficiency and therefore to a given total bit rate for a given source code. For adaptation of the air interface of this system, at the time of a call between a mobile station and a base transceiver station, two separate analyses of transmission quality are carried out for each transmission direction, respectively, and, for each transmission direction, one of the coding modes is selected in accordance with the corresponding transmission quality analysis.

Abstract: A scheme for multiplexing transport channels on one or several communication channels is used to operate in a normal mode and in a compressed mode which requires a lower symbol rate to provide in active periods in the communication channels. To match the symbol rate on each of the transport channels, a symbol puncturing is performed in two passes: marked symbols are introduced and are subjected, along with the other information symbols, to different operations including an interleaving, before being deleted from the transmitted sequence. Accordingly, those operations can be performed in the same manner in the normal and compressed modes, which limits the complexity of the communicating entities.

Abstract: The invention concerns a BCCH carrier transmitted by a base station of a digital cellular mobile radio system. The BCCH carrier is segmented temporally into frames each divided into a particular number NIT of time slots. The BCCH carrier supports a physical BCCH itself carrying at least one logical BCCH transmitting BCCH information. Each mobile station, for which the base station transmitting said BCCH carrier is an adjoining base station, has at least one monitoring window in each of at least NT successive frames, where NT≧1, i.e. at least NF successive monitoring windows each enabling the mobile station concerned to receive at least NE time slots of the BCCH carrier, where NE≧1. The BCCH carrier supports at least NR physical BCCH transmitted at constant power and consisting in the recurrence in each frame of NR BCCH time slots. The or each of the NR physical BCCH carries at least the logical BCCH, each BCCH time slot containing the BCCH information at least once in NT successive frames.

Abstract: A mobile radio system enables exchange of bidirectional digital signals between at least one mobile station and at least one base transceiver station and provides at least two coding modes, each mode corresponding to a predetermined source code and a predetermined channel code for the transmission of a wanted signal for each transmission direction. Each source code corresponds to a given user bit rate and each channel code corresponds to a given coding efficiency and therefore to a given total bit rate for a given source code. For adaptation of the air interface of this system, at the time of a call between a mobile station and a base transceiver station, two separate analyses of transmission quality are carried out for each transmission direction, respectively, and, for each transmission direction, one of the coding modes is selected in accordance with the corresponding transmission quality analysis.

Abstract: The present invention relates to wireless communication systems and in particular to wireless communication systems which employ coder-decoder means in the transmission of information between two parts of the system. One aspect of the present invention provides method of setting up a wireless communications link between two radio stations which each communicate with a respective base station by the use of a selected one of several codecs; the method comprising: the signalling by each party to the other party of the codecs supported between each radio station and base station by said each party; and selecting an appropriate codec based upon the signalling information, whereby the quality of the link is maximised.

Abstract: A method of constructing a spreading code associated with one user of a direct sequence code division multiple access digital transmission system includes at least one stage of concatenating a plurality of different sub-codes. Specifically, the spreading code is constructed by concatenating at least two different, in particular, cyclically different, basic sub-codes belonging to the same family of basic sub-codes, and at least one secondary sub-code obtained by circular permutation of one of the basic sub-codes. The constructed spreading code is then designated as being associated with the one user.

Abstract: A threshold detector for digital signal transmission systems using a transmission channel, in particular for transmission to mobiles, calculates a set of coefficients f.sub.n belonging to the group comprising a set of coefficients c.sub.n of the correlation between a first series of digital samples x.sub.n received by the receiver and a second series of reference digital samples p.sub.n known to the receiver, in order to acquire synchronization of the system, and a set of coefficients h.sub.n of an estimate of the impulse response of the transmission channel, when the system is already synchronized. It also calculates a decision variable A such that: ##EQU1## where L and N are predetermined integers. The device has many applications in mobile radio systems, for example for acquisition of synchronization in DS-CDMA systems or for optimizing the transmission channel estimate.