330 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.

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 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 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.

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.

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 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.

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.