333 results about "Channel access method" patented technology

A novel and useful media access control (MAC) protocol that is intended for use over noisy shared media channels. The MAC protocol provides layer 2 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.

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 channel access method for a very high throughput (VHT) system using a bonding channel having a plurality of subchannels is provided. The method includes receiving training information comprising a training offset value through a subchannel, performing channel estimation on a full channel bandwidth comprising all subchannels when a time corresponding to the training offset value is elapsed after the training information is received, transmitting a request to send (RTS) frame to a destination station through some subchannels selected from the plurality of subchannels by one or a plurality of source stations according to a result of the channel estimation, and transmitting a clear to send (CTS) frame to one source station selected from the plurality of source stations by the destination station in response to the received RTS frame. Accordingly, an effective channel access mechanism is provided for the VHT system, and collision among stations can be avoided.

Provided are space division multiple access for wireless local area network (WLAN), and channel estimation for the same. A frequency division multiple access technique and a space division multiple access technique based on competition are used together for channel access. The channel access method includes: a competition period for estimating channel characteristics for a plurality of stations and transmitting, to the plurality of stations, downlink schedule information or uplink schedule information based on the estimated channel characteristics; and a data transmission period for performing downlink transmission or uplink transmission with all or some of the plurality of stations in accordance with the downlink schedule information or the uplink schedule information.

The present invention discloses a multi-antenna device channel access method and apparatus. The method comprises the steps of acquiring a sending request of sending data by using a multi-antenna device; and performing independent channel access in each beam direction corresponding to the sending request. Through adoption of the multi-antenna device channel access method and apparatus, a technical problem of low spectrum efficiency of channel access of the multi-antenna device is solved.

An object of the present invention is to provide an efficient channel access method on the base of propagation delay times in a random access system. The access control method of the present invention for CDMA system wherein a base station is connected with a plurality of mobile stations by the random access is characterized in that the base station stores the propagation delay time of the preamble signal into a memory unit, when the base station transmits a rejection signal for rejecting a communication toward the mobile station which transmits the preamble signal. Further, the base station transmits a allowance signal for allowing a communication toward the mobile station of which propagation delay time is substantially equal to that stored in the memory in the base station.

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.

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.

A unified access method for all service channels of electric power marketing relates to a channel access method. The traditional extensive customer service management mode cannot support personalized and precise novel customer service demands. The structures of all kinds of channels are complicated, which poses high security risks. The method comprises the following steps: conducting unified channel service access based on a distributed service application framework; and introducing a permission mechanism of registration, binding, real-name authentication and service password authentication to realize unified management of channel registration accounts and account permissions, including unified account management and unified permission management. Through the technical scheme, standardized access to all service channels of electric power marketing is completed. An electric power service card is built to realize unified account management and connectivity of service channels. Through registration, binding, service password authentication and real-name authentication, a unified permission authentication system for accounts is built. Therefore, the data consistency and operating precision of electric power marketing service channels are ensured.

The invention discloses a channel access method and a node. The method comprises the following steps of: randomly selecting a backoff period XB according to a backoff exponent (BE), wherein the XB is equal to X*a UnitBackoffPeriod, and the X is a randomly selected integer in a range of 0 to (2BE-1); when the X is more than or equal to a preset value, determining a middle backoff period which is smaller than the backoff period, performing backoff until the middle backoff period is over, and performing a clear channel assessment (CCA), transmitting data if a channel is clear, continuing the backoff until the backoff period is over if the channel is not clear, performing the CCA again, and executing channel access operation according to a CCA result when the backoff period is over; and otherwise, when the X is less than the preset value, performing the backoff until the backoff period is over, performing the CCA, and executing the channel access operation according to the CCA result. According to the method and the node, when the backoff period is long, the CCA can be performed after performing backoff until the middle backoff period is over, and the data are transmitted when the channel is clear, so that data transmission time delay can be reduced.

The invention provides a direct-broadcasting-room channel access method and system. The method includes the steps that requests for having access to channels of first clients are obtained, and first clients are connected with corresponding channels; whether the number of the clients currently having access to the corresponding channels in an online mode reaches the preset access threshold value or not is judged; if not, the service information of the corresponding channels is sent to the first clients; if yes, the first clients are added to a queue list to be cached. According to the technical scheme, the number of the clients watching direct broadcasts at the same time is limited for the channels of a direct broadcasting room technically, the problem that excessively large pressure is generated to direct broadcast service processing of the channels due to the fact that too many clients watch the direct broadcasts at the same time is solved, the stability of a direct broadcasting system is improved, and client access to the channels of the direct broadcasting room can be effectively managed.

The invention discloses a self-adaptive media access control (MAC) protocol for a vehicle-mounted wireless self-organized network, comprising a DR-ALOHA protocol which is used by a control channel and a strategy for accessing a business channel through a node dynamic selection competition method or a pre-reservation method, wherein the DR-ALOHA protocol dynamically adjusts the number of fixed-length time slot in a time division multiplexing principle so that the secure information of all nodes in a network can be transmitted reliably in real time, and is applicable to networks with the node density and the topological structure being dynamically changed; in the strategy of accessing the business channel through the node dynamic selection competition method or the pre-reservation method, firstly the switching threshold of a business channel access method is determined by theoretical analysis and mathematical deduction and then the business channel is accessed through the node dynamic selection competition method or the pre-reservation method by integrating the real-time channel utilization rate of the business channel, so that the channel utilization rate of the business channel can be the highest in any node density.

Provided are a method of performing contention based channel access by classifying a contention period into a beamformable contention period in which a beamforming is allowed and a non-beamformable contention period in which the beamforming is interrupted so as to resolve an issue regarding channel access occurring due to an introduction of a directional antenna for handling a path loss in a wideband wireless communication system according to an embodiment of the present invention, and a method for maximizing a spatial reuse gain by managing, for each direction, information about a transmission time of a message received from a dispersion device.

A channel access method in a wireless local area network (WLAN) system using a multi-channel configured by aggregation of a plurality of subchannels is provided. The method includes receiving from an access point (AP) a multi-channel switching request frame for requesting a first station operating in a first subchannel constituting the multi-channel to switch to a second subchannel constituting the multi-channel and transmitting a multi-channel switching response frame for reporting whether to switch to the second subchannel in response to the multi-channel switching request frame.

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.

The present invention provides a method, device, and system for adjusting a contention window size for performing channel access. The method includes: receiving uplink scheduling information on the uplink transmission including a new data indicator (NDI) associated with a specific subframe in a first uplink transmission burst; determining a contention window size based on the NDI; generating a random number N (N≥0) in the determined contention window size based on the NDI associated with the specific subframe; and performing the uplink transmission on the specific cell after sensing a channel on the specific cell at least for N slots while the channel on the specific cell is idle. If the NDI is toggled, the contention window size is reset to a minimum value, and if the NDI is not toggled, the contention window size is increased to a next higher allowed value.

The invention provides a wireless information channel access method and a system. The method includes that an access station sends a radio frame comprising access parameters of at least one group of stations; and a station receives the radio frame, the station is contained in the at least one group of stations, when the stations contain to-be-sent data, and according to the access parameters of the stations of the group, data sending is conducted by utilizing a competitive mode during uplink transmission time of the access parameters. The access station of the method sends the radio frame comprises the access parameters of the at least one group of stations, the stations are accessed into the information channels through a competitive mode during uplink transmission time of scheduling time for the stations, data transmission is conducted, lower energy consumption of the stations can be guaranteed, system overhead of the sending of the uplink transmission time parameters by each station is reduced, and the purposes of electricity saving and battery using time prolonging are achieved.

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 present invention, a method for transmitting a coexistent data stream, the method including: transmitting coexistent data stream transmission information including transmission power information of a first data stream targeted for a first station and transmission power information of a second data stream targeted for a second station in an environment in which the first station, a legacy station, coexists with a second station, a station supporting a wireless local area network (WLAN) system evolved further than the first station; and transmitting, by an access point (AP), the first and second data streams to the second station and the first station, wherein the AP transmits the first data stream with a higher transmission power level than that of the second data stream according to the coexistent data stream transmission information.

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.

Network node for a distributed cooperative multi-antenna communication, including at least two sending and receiving units, wherein the network node is adapted to receive an indication of a protocol descriptor from a mobile communication device and wherein the network node is communicatively couplable with at least one further network node. Furthermore, the network node may be adapted to provide and / or receive an indication of a protocol descriptor and / or a channel access method to / from the at least one further network node.

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 present invention relates to a method by which a station (STA) which operates in power save mode in a wireless LAN system transmits and receives frames. The method includes the steps of: obtaining a channel access authority on the basis of at least one slot time, wherein each slot time is the unit time when a channel is maintained in an idle state for a channel access by the STA; transmitting a power save (PS) poll frame requesting the transmission of a buffered frame to an access point (AP); and receiving a response frame from the AP in response to the PS poll frame. The length of each slot time is set to be longer than the transmission time of the PS poll frame.

The present invention relates to a channel access method for data transmission, and a wireless communication method and a wireless communication terminal using the same, and more particularly, to a wireless communication method and a wireless communication terminal for efficiently scheduling data transmissions of a plurality of terminals. To this end, provided are a wireless communication terminal comprising a processor and a transceiver, wherein the processor receives a trigger frame indicating an uplink multi-user transmission, and transmits an uplink multi-user PLCP protocol data unit (PPDU) in response to the received trigger frame, wherein the trigger frame and a non-legacy preamble of the uplink multi-user PPDU contains remaining transmission opportunity (TXOP) time information of a current TXOP and a wireless communication method using the same.

Disclosed are a base station and a channel access method performing a channel access in a unlicensed band. The channel access method includes: performing channel sensing at least once on a channel of the unlicensed band in a channel sensing period of a frame; and broadcasting a reservation signal for the channel when the channel is empty.

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.

A method for accessing a channel under spatial multiplexing and a station, the method including: a monitoring station detects a first radio signal of a third party station and updates local network allocation vector and / or response frame indication deferral access time; if a second radio signal of the third party station is determined to meet the spatial orthogonal condition, a channel competition accessing process is triggered, and subsequent data transmission is completed within the updated time. Under the condition that the network allocation vector or the response frame indication deferral access time is not zero, when the third party station determines that sector transmission in the transmission initiated by the station is orthogonal with own transmission space to be conducted, the third party station ignores or resets the network allocation vector or the response frame indication deferral access time, initiates competition and starts spatial orthogonal transmission within the updated network allocation vector or response frame indication deferral access time. While spatial multiplexing is realized, fairness of channel accessing between stations is ensured; thus, effectiveness of data transmission of stations is ensured.