Abstract: In 802.11ax networks with access points, a trigger frame offers scheduled and random resource units to nodes for data uplink communication to the access points. To make more effective the usage of the network, the access point may design the trigger frame to force the nodes to send some categories of data. Resource units may be defined in trigger frames to be dedicated to small packets or to some access category data. Adjusting the time length of the resource units helps restricting the type of data that can be conveyed by the resource units. Also, using various frequency widths for resource units in the same trigger frame helps reducing padding in the resource units when various traffic types coexist.

Abstract: A communication method in a communication network comprising a plurality of nodes, at least one node comprising a plurality of traffic queues for serving data traffic at different priorities, each traffic queue being associated with a respective queue backoff value computed from respective queue contention parameters having first and second values in, respectively, a first and a second contention modes, obtaining quality of service requirements of data stored in a traffic queue of the node; checking whether the quality of service requirements can be fulfilled when accessing the communication channel using the second contention mode; if the requirements cannot be fulfilled as the result of the checking, disabling access to resource units provided by the other node within one or more transmission opportunities granted to the other node on the communication channel; and transmitting data stored in the traffic queue using the first contention mode.

Abstract: In an 802.11ax network with an access point, a trigger frame offers random resource units to nodes for data uplink communication to the access point. To dynamically adapt the contention mechanism used by the nodes to access the random resource units, the AP updates a correcting TBD parameter at each new TXOP and includes the updated adjusting parameter in the trigger frame for the next TXOP. The nodes use the TBD parameter to generate a local random RU backoff value from a contention window range, for contending for access to the random resource units. The TBD parameter may directly impact the contention window size CWO or boundaries values of a selection range from which CWO is selected.

Abstract: A physical Access Point (AP) manages a plurality of BSS groups through Virtual APs. The AP periodically sends beacon frames informing of the profile of each BSS of the plurality of BSSs. To improve channel utilization, the trigger frame identifies a plurality of BSS groups, stations of which are allowed to access the resources units to transmit data during the reserved TXOP. The AP receives, during the reserved TXOP, data from one station of a first group identified in the trigger frame and data from one station (separate from the first one) of a second and separate group identified in the trigger frame. First group and second group use the same joint set of random access parameters for the random access procedure, thus ensuring equivalent fairness in accessing the offered the resources units to transmit data during the reserved TXOP to several BSSs.

Abstract: The invention relates to a method and device for sending data over a channel of a communication medium comprising a plurality of channels and which can be accessed by a plurality of nodes. Each node using a medium access mechanism with collision avoidance based on a computation of backoff values corresponding to a number of time-slots a node waits before accessing the communication medium. The method comprising the following steps performed by a first node of the plurality of nodes upon the reception of a trigger frame: obtaining a backoff counter value computed by the first node; selecting a channel among the plurality of channels based on the obtained backoff counter; and sending data on the selected channel by the first node.

Abstract: In an 802.11ax network with an access point, a trigger frame offers scheduled and random resource units to nodes for data uplink communication to the access point. To avoid the overall energy level seen by legacy nodes for a communication channel to drop below a detection threshold, the invention provides two tools. First, the scheduled and random resource units may be interleaved over communication channels. Second, unused resource units may be detected, and a node or the access point may send a padding signal on them to increase the overall energy level. The latter may be evaluated during a monitoring period before deciding to emit the signal. As the overall energy level seen by legacy nodes is increased, the risk that such legacy nodes do not detect activity on a 20 MHz channel having only a subpart of its RUs used is reduced. And risks of collisions are consequently reduced.

Abstract: The invention is directed to the optimization of an access to a medium in wireless networks which can be accessed by a plurality of nodes, each node of the plurality of nodes using a medium access mechanism of the Carrier Sense Multiple Access with Collision Avoidance type based on a computation of a backoff value. A specific value is associated with each node of a set of nodes of the plurality of nodes, the specific value of a node being known by the other nodes of the set of nodes. According to the invention, a backoff value is determined for each node of the set of nodes, in each node of the set of nodes, the backoff value associated with a node being determined as a function of the specific value associated with that node.

Abstract: 802.11ac networks define an operating band made of an ordered series of 20 MHz channels and authorize a restricted number of possible composite channel configurations to be used for data transmission. A method of transmitting data between a source and a receiver in such a wireless network may comprise, at the source: sending, to the receiver, RTS fames to request reservation of a composite channel, the RTS frames including a flag signalling the source supports transmission over un-authorized composite channels, for instance over sub-channels not contiguous within the operating band; receiving, from the receiver in response to the RTS frames, CTS frames acknowledging reservation of un-authorized composite channel configuration, for instance of non-contiguous sub-channels; and then transmitting, to the receiver, data frames on the reserved sub-channels of the un-authorized configuration, for instance on the reserved non-contiguous sub-channels within the operating band.

Abstract: A wireless communication method in a wireless network comprising an access point and a plurality of stations. The method includes selecting a transmission mode among a first and a second transmission modes, wherein access to a communication channel in the first transmission mode uses a contention mechanism with stations of the network, while access to the communication channel in the second transmission mode uses a preemption mechanism; sending a trigger frame to the stations using the selected transmission mode, the trigger frame reserving a transmission opportunity on at least one communication channel of the wireless network and defining resource units forming the communication channel and including a plurality of resource units that the stations can access for sending data; and receiving data from stations over the defined resource units.

Abstract: A method of communication in a wireless network comprising a plurality of wirelessly communicating stations, the method comprising by at least one emitting station having data to be directly transmitted to at least two different destination stations, generating a buffer status report to be transmitted to one of the destination stations, the buffer status report indicating an amount of data stored in at least an emission buffer of the emitting station, the emission buffers comprising all data to be transmitted to all the destination stations; transmitting the buffer status report to the destination station; wherein the amount of data is limited to the amount of data stored in at least an emission buffer of the emitting station to be transmitted to the destination station that will receive the buffer status report. Accordingly, scheduled traffic by a station is made with an accurate amount of data.

Abstract: A method of communication in a wireless network comprising a plurality of wirelessly communicating stations, one station playing the role of access point, the other stations being connected to the access point station, the method comprising by the access point station receiving at least one buffer status report from a station indicating a size of a quantity of data the station has to transmit to the access point station; storing received buffer status reports; generating a channel resource allocation for a multi-user transmission from the stations to the access point station based on stored buffer status reports; wherein the generation of a channel resource allocation further takes into account the size of any quantity of data received from the stations after the buffer status reports.

Abstract: The method improves data exchange on a wireless communication medium accessible by a plurality of nodes via a contention mechanism, the plurality of nodes comprising legacy nodes and a collaborative group of nodes, each node of the collaborative group being provided with a first and a second MAC address. The method comprises, upon successful contention at a first node of the group, at the first node: determining if a communication from a source node of the group to a legacy node is required, and in such a case, selecting the second MAC address of the source node as source address for issuing a request to access the medium (RTS), and, upon reception of a medium access authorization (CTS): transmitting first data to the legacy node using said second MAC address, and transmitting second data inside the group using said first MAC address.

Abstract: The invention comprises adjustment of back-off timers to provide consistency of timing in a group of collaborating nodes. The invention facilitates optimizing access to a wireless medium in a communication network accessible by a plurality of nodes, each node implementing a back-off counting based on carrier sense multiple access with collision avoidance, the plurality of nodes comprising a collaborative group of nodes further implementing a back-off allocation scheme based on each node maintaining a list of expected back-off values of the other nodes of the collaborative group, the group further comprising a receiving node and an emitting node, reception of information from the emitting node being utilized by the receiving node to maintain consistency of timing through adjustment of back-off values.

Abstract: The present invention relates to communication between collaborative nodes configured to collaboratively communicate in a radio network. A corresponding method comprises: sending, by each active node of the set of collaborative nodes, an RTS message for the same transmission slot; sending, by one of the active nodes, referred to as coordinator node, a CTS message to acknowledge reservation of said transmission slot on behalf of all the active nodes, upon receiving the RTSs; wherein the transmission slot is divided, based on the sent RTSs, into sub-slots for respective active nodes to transmit data packets. The invention provides an improved use of the reserved transmission slot, and a reduced waste of reserved time.

Abstract: A method of controlling data transmission from a transmitting unit to a receiving unit through an asynchronous serial link is provided. The method is performed by a controlling unit and includes the steps of sequentially receiving data and synchronization messages are sequentially received from the transmitting unit; sequentially parsing the messages received; and when a message parsed is a synchronization message, blocking relaying to the receiving unit, of the data messages following said synchronization message, until an event associated with the synchronization message occurs.

Abstract: The present invention concerns a method and a device for transmitting sensor data in a wireless network. The network is based on a shared transmission channel. Access to the shared transmission channel is scheduled by the master node. The slave node comprises an acquisition device producing said data. The method comprises on the slave node: obtaining a request for acquiring data from the master node; estimating the value of a time information representative of a delay for the acquisition device to acquire a block of data ready for transmission; sending a message to the master node comprising the estimated time information; receiving an authorization of transmission from the master node, said authorization of transmission being scheduled at a time depending on the estimated time information; and transmitting a block of data to the master node after said reception according to the received authorization.

Abstract: A method is proposed for managing a distribution of bandwidth in a communications network by means of a slave node of the network, said network comprising a set of nodes. The slave node is such that it performs steps for: determining a coarse representation and a detailed representation of the distribution of the bandwidth in said network, as a function of a piece or pieces of information relative to conditions of transmission in said network and/or relative to applications needs of transmission; receiving a coarse reference representation of the distribution of bandwidth in said network, coming from a master node of said network; comparing said determined coarse representation and said reference coarse representation; should said coarse representations be identical, applying said determined detailed representation; if not, applying said coarse reference representation.

Abstract: A method of accessing a communication medium used by a plurality of communication terminals, comprising the following steps, performed by a first communication terminal belonging to a group of communication terminals from the plurality of communication terminals: detecting 410 an upcoming reservation, by a second communication terminal of the group, of an occupancy time interval of the communication medium, determining 420 a timeslot in the occupancy time interval, and transmitting 460 data over the communication medium during the determined timeslot. The method provides improvements in the communications of communication terminals sharing a communication medium.

Abstract: The invention is directed to the optimization of an access to a medium in wireless networks which can be accessed by a plurality of nodes, each node of the plurality of nodes using a medium access mechanism of the Carrier Sense Multiple Access with Collision Avoidance type based on a computation of a backoff value. A specific value is associated with each node of a set of nodes of the plurality of nodes, the specific value of a node being known by the other nodes of the set of nodes. According to the invention, a backoff value is determined (505, 510) for each node of the set of nodes, in each node of the set of nodes, the backoff value associated with a node being determined as a function of the specific value associated with that node.

Abstract: The method improves data exchange on a wireless communication medium accessible by a plurality of nodes via a contention mechanism, the plurality of nodes comprising legacy nodes and a collaborative group of nodes, each node of the collaborative group being provided with a first and a second MAC address. The method comprises, upon successful contention at a first node of the group, at the first node: determining if a communication from a source node of the group to a legacy node is required, and in such a case, selecting the second MAC address of the source node as source address for issuing a request to access the medium (RTS), and, upon reception of a medium access authorization (CTS): transmitting first data to the legacy node using said second MAC address, and transmitting second data inside the group using said first MAC address.