Abstract: A method for synchronizing in a TDMA frequency-hopping ad-hoc telecommunications network wherein slots includes at least one dwell of set duration and a guard time at least equal to the maximum propagation time in the network are respectively reserved for the emissions of one particular piece of equipment of the network, comprising: a first step of periodically allocating at least one slot per piece of equipment of the network for the transmission of a beacon, a second step wherein the beacon is emitted, a third step wherein each first piece of equipment of the network estimates a time difference ?t from a start time of the slot and from an actual reception time of the beacon, and a fourth step wherein the first piece of equipment of the network uses the time difference ?t for the reception of data slots sent by the second piece of equipment of the network.

Abstract: A method for synchronizing in a TDMA frequency-hopping ad-hoc telecommunications network wherein slots includes at least one dwell of set duration and a guard time at least equal to the maximum propagation time in the network are respectively reserved for the emissions of one particular piece of equipment of the network, comprising: a first step of periodically allocating at least one slot per piece of equipment of the network for the transmission of a beacon, a second step wherein the beacon is emitted, a third step wherein each first piece of equipment of the network estimates a time difference ?t from a start time of the slot and from an actual reception time of the beacon, and a fourth step wherein the first piece of equipment of the network uses the time difference ?t for the reception of data slots sent by the second piece of equipment of the network.

Abstract: A communication network comprising a Network Address Translator (NAT) arranged to translate between a public NAT address and a plurality of private NAT addresses. A network element has a plurality of network interfaces each of which corresponds to a private NAT address. A connection processor sets up a connection for data communication which is capable of supporting a plurality of network interfaces of the network element. An identifier processor initializes a network interface identifier for identifying individual network interfaces for the connection. The network interface identifier is distributed to the NAT and the network elements of the connection. Incoming data packets for the network elements are then adapted to include the network interface identifier and the NAT uses this to address the data packets in response to the first network interface identifier.

Abstract: A communication network comprising a Network Address Translator (NAT) arranged to translate between a public NAT address and a plurality of private NAT addresses. A network element has a plurality of network interfaces each of which corresponds to a private NAT address. A connection processor sets up a connection for data communication which is capable of supporting a plurality of network interfaces of the network element. An identifier processor initializes a network interface identifier for identifying individual network interfaces for the connection. The network interface identifier is distributed to the NAT and the network elements of the connection. Incoming data packets for the network elements are then adapted to include the network interface identifier and the NAT uses this to address the data packets in response to the first network interface identifier.

Abstract: The method for transmitting a video sequence from a transmitting terminal (1) including at least one short-range radio interface and one long-range radio interface towards at least one receiving terminal (5) comprises the steps of segmenting the video sequence into a base layer, making it possible to obtain a low-quality video sequence, and at least one improvement layer, complementary to the base layer, and making it possible, in combination with the base layer, to obtain a better quality video sequence, transmission by the long-range radio interface of the transmitting terminal (1) of at least the entire base layer towards the receiving terminal (5), transmission by the short-range radio interface (1) of at least the entire improvement layer towards at least one cooperation terminal (2) comprising at least one short-range radio interface and one long-range interface (13), and transmission, by the long-range radio interface, of said cooperation terminal (2), of at least the entire improvement layer towards t

Abstract: A wireless communication unit (101) for a radio communication system comprises a device token controller (403) which receives at least a first geographical radio resource token allocated to the wireless communication unit (101) by a radio resource token controller (117) of a network of the radio communication system. The first geographical radio resource token provides a first radio resource right allocation to the wireless communication unit (101) for a first geographical area. A radio resource manager (407) then determines a radio resource usage parameter in response to the first radio resource right allocation. Specifically, the radio resource manager (407) may only determine the radio resource usage parameter in response to the first radio resource right allocation if the location estimate is within the first geographical area. The radio communication system may be a heterogeneous communication system.

Abstract: A wireless local area network comprising an access point and a plurality of remote stations arranged to communicate using Orthogonal Frequency Division Multiplex (OFDM). The system can operate in a first access mode wherein access to the access point is in accordance with a Carrier Sense Multiple Access (CSMA) scheme and in a temporary second access mode wherein access to the access point is in accordance with a Time Division Multiple Access (TDMA) scheme. A resource allocation of resource blocks when in the TDMA mode is furthermore such that resource blocks may be allocated to a plurality of remote stations which have overlapping time intervals and disjoint sets of OFDM subcarriers thereby allowing simultaneous communication for the plurality of remote stations within the overlapping time interval. The access operation is controlled by a single message transmitted from the access point. The invention may in particular be suitable for IEEE 802.11 systems.

Abstract: The method for transmitting a video sequence from a transmitting terminal (1) including at least one short-range radio interface and one long-range radio interface towards at least one receiving terminal (5) comprises the steps of segmenting the video sequence into a base layer, making it possible to obtain a low-quality video sequence, and at least one improvement layer, complementary to the base layer, and making it possible, in combination with the base layer, to obtain a better quality video sequence, transmission by the long-range radio interface of the transmitting terminal (1) of at least the entire base layer towards the receiving terminal (5), transmission by the short-range radio interface (1) of at least the entire improvement layer towards at least one cooperation terminal (2) comprising at least one short-range radio interface and one long-range interface (13), and transmission, by the long-range radio interface, of said cooperation terminal (2), of at least the entire improvement layer towards t

Abstract: A wireless communication unit (101) for a radio communication system comprises a device token controller (403) which receives at least a first geographical radio resource token allocated to the wireless communication unit (101) by a radio resource token controller (117) of a network of the radio communication system. The first geographical radio resource token provides a first radio resource right allocation to the wireless communication unit (101) for a first geographical area. A radio resource manager (407) then determines a radio resource usage parameter in response to the first radio resource right allocation. Specifically, the radio resource manager (407) may only determine the radio resource usage parameter in response to the first radio resource right allocation if the location estimate is within the first geographical area. The radio communication system may be a heterogeneous communication system.

Abstract: A wireless local area network comprising an access point and a plurality of remote stations arranged to communicate using Orthogonal Frequency Division Multiplex (OFDM). The system can operate in a first access mode wherein access to the access point is in accordance with a Carrier Sense Multiple Access (CSMA) scheme and in a temporary second access mode wherein access to the access point is in accordance with a Time Division Multiple Access (TDMA) scheme. A resource allocation of resource blocks when in the TDMA mode is furthermore such that resource blocks may be allocated to a plurality of remote stations which have overlapping time intervals and disjoint sets of OFDM subcarriers thereby allowing simultaneous communication for the plurality of remote stations within the overlapping time interval. The access operation is controlled by a single message transmitted from the access point. The invention may in particular be suitable for IEEE 802.11 systems.

Abstract: A communication network comprising a Network Address Translator (NAT) arranged to translate between a public NAT address and a plurality of private NAT addresses. A network element has a plurality of network interfaces each of which corresponds to a private NAT address. A connection processor sets up a connection for data communication which is capable of supporting a plurality of network interfaces of the network element. An identifier processor initialises a network interface identifier for identifying individual network interfaces for the connection. The network interface identifier is distributed to the NAT and the network elements of the connection. Incoming data packets for the network elements are then adapted to include the network interface identifier and the NAT uses this to address the data packets in response to the first network interface identifier.