332 results about "Channel access method" patented technology

Quality of Service (QoS) support is provided by means of a Tiered Contention Multiple Access (TCMA) distributed medium access protocol that schedules transmission of different types of traffic based on their service quality specifications. In one embodiment, a wireless station is supplied with data from a source having a lower QoS priority QoS(A), such as file transfer data. Another wireless station is supplied with data from a source having a higher QoS priority QoS(B), such as voice and video data. Each wireless station can determine the urgency class of its pending packets according to a scheduling algorithm. For example file transfer data is assigned lower urgency class and voice and video data is assigned higher urgency class. There are several urgency classes which indicate the desired ordering. Pending packets in a given urgency class are transmitted before transmitting packets of a lower urgency class by relying on class-differentiated urgency arbitration times (UATs), which are the idle time intervals required before the random backoff counter is decreased. In another embodiment packets are reclassified in real time with a scheduling algorithm that adjusts the class assigned to packets based on observed performance parameters and according to negotiated QoS-based requirements. Further, for packets assigned the same arbitration time, additional differentiation into more urgency classes is achieved in terms of the contention resolution mechanism employed, thus yielding hybrid packet prioritization methods. An Enhanced DCF Parameter Set is contained in a control packet sent by the AP to the associated stations, which contains class differentiated parameter values necessary to support the TCMA. These parameters can be changed based on different algorithms to support call admission and flow control functions and to meet the requirements of service level agreements.

A method signals data in a channel of a network including multiple stations and an access point connected by a wireless channel. A station first requests access to the channel using a sequential coordinated channel access method of an access point. After the station receives permission to access the channel during a contention free period at a time corresponding to a sequence index value received by the station from the access point, the station transmits a resource request message to the access point to obtain a bandwidth allocation. In response, the station receives the bandwidth allocation, and the station can then transmit data during the contention free period according to the bandwidth allocation.

A system and method for implementing a peer-to-peer wireless local area network (WLAN) that does not require a conventional wireless access point, yet facilitates many of the features provided by an access point, such as channel access management and Quality of Service functions. A method for dynamically selecting a Channel Access Manager (CAM) that (preferably) has the ability to communicate with the greatest number of wireless stations in a given WLAN is provided. The CAM is then used to manage channel access for the WLAN. A method for selecting one or more proxy CAMs that establish communication paths between the CAM and wireless stations with which the CAM traditionally would not be able to communicate is also provided. The invention also provides a method for resolving the issues that occur when a new station is added to the WLAN, and provides optimize routing of messages to maximize transmission bandwidths.

The invention provides an energy-saving method for the medium access control layer in a wireless mesh network, in which all nodes in the network, on the premise of time synchronization, implementing a periodic synchronized awakening handshake operation; for a node requesting for data sending, a brief awakening tone is sent firstly to inform the destination node of the intention of data sending at the moment of awakening handshake, and then a channel access method based on a competition mechanism is used for sending data frames; for a node without data sending request, a brief channel monitoring is performed firstly in order to detect channel activities at the moment of awakening handshake, and if having sensed intention to send data from the node nearby, a receiving state is then kept in order to receive the upcoming data frames, otherwise, turning into sleep mode immediately; and the dynamically changing of load and the bursting flow are adapted by an adaptive awakening handshake mechanism, and the sensitivity of network performance to the setting of 'Awakening Handshake' cycle is reduced thereby. The invention enables all nodes in the network to carry out the on-demand awakening operation in a large extent with little cost, and therefore has a good energy-saving effect.

A method and device for performing channel access in a wireless LAN are disclosed. An initial channel access method of a station STA in a wireless LAN may include: receiving, from an access point (AP) by the station STA, a frame including information on a channel state, information on a channel access protection section and information on a station STA capable of performing channel access in the channel access protection section; determining a channel access priority by a station STA when the information on the channel state indicates that a wireless link is in a congestion state; and performing initial channel access in the channel access protection section based on the channel access priority determined by the station STA and the information on the station STA capable of performing channel access in the channel access protection section.

The embodiment of the invention provides a LoRa network channel access method and system, a terminal, a gateway and a server. The method comprises the steps of: prior to message sending to a LoRa gateway, monitoring whether a channel to be selected in a channel list to be selected is idle or not; if a first channel to be selected is idle, monitoring whether the first channel to be selected is occupied by LoRa leading signals after the first duration is delay at will; if the first channel to be selected is not occupied, sending an LoRa message to the LoRa gateway through the first channel to beselected. The LoRa network channel access method and system, the terminal, the gateway and the server solve the problems that the LoRa channel is high in collision, the utilization is low, the LoRa terminal is multiple in retransmission and the power consumption is high, and the air interface utilization is improved.

A novel and useful media access control (MAC) protocol that is intended for use over noisy shared media channels. The MAC protocol provides layer functionality over a network using a shared medium including a backoff mechanism for CSMA.CA channel access, link addressing that reduces the overhead of long MAC addresses, a flooding scheme having controlled exposure for broadcast transmissions, multicast transmissions using selective ACKs, implementation of traffic prioritization using an adaptive backoff scheme, a second layer repeater establishment process and multi-packet transport for short packets and fragmentation for long packet transport.

According to an embodiment of the present invention, a channel access method in a very high throughput (VHT) system using a bonding channel consisting of a plurality of subchannels is provided. Wherein the Method comprises: transmitting a request to send (RTS) frame by one source station or each of a plurality of source stations to a destination station through any subchannel selected from the plurality of subchannels; and in response to the received RTS frame, transmitting a clear to send (CTS) frame by the destination station to one source station selected from the plurality of source stations through the bonding channel.

The invention relates to a channel access method for a ship-mounted wireless mobile Ad-hoc network based on self-organization time division multiple access, which is characterized in that a unicast channel is compatible with a broadcast channel, and channel is accessed in by means of the mode of a self-organization synchronous time division multiple access; two movement parameters of distance and speed are considered according to actual conditions of a ship, and an emergency signal is ensured to be preferentially accessed into the channel by means of risk factor levels; strategies of solving a constraint set of a minimum node and a three-level node withdraw scheme are adopted. Furthermore, if a broadcast signal is not obtained, a protocol degrades to an ordinary IEEE802.11 DCF to guarantee robustness of a system. Geographic information is fully utilized to solve the problem of exposure and concealing of a terminal and the scheme of selecting the constraint set of the minimum node (SMC) is solved. The channel access method is one of key technologies for constructing the ship-mounted mobile Ad-hoc network (MANET), and provides strong reference value for other mobile device organization networks.

The invention provides a payment server which comprises a resolving unit, an obtaining unit and a finding unit. The resolving unit is used for resolving payment mode data provided by a plurality of proxy servers and generating a plurality of payment channel data, the obtaining unit is used for obtaining payment inlet types selected by client side, and the finding unit is used for finding out a plurality of related payment channels belonging to the selected payment inlet types based on a data base. The invention further provides a terminal which comprises an access unit, a switch unit and a display unit, the access unit is connected with the plurality of related payment channels simultaneously, the switch unit is used for opening any one of the plurality of related payment channels, closing other payment channels, closing current payment channels and opening any one of other payment channels when the current payment channels are unusual in access, and the display unit displays the opened payment channels. The invention further provides a payment channel access method. By means of the technical scheme, rapid switching of the payment channels can be achieved, and stability of payment operation can be guaranteed.