摘要:
A wireless network (1) comprises mesh devices and non-mesh devices. A medium access control architecture incorporates at least a point coordination function as an access method, wherein the point coordination function starts a contention-free period (30) with a beacon (32) so that a non-polled transmission by the non-mesh devices is prevented. Further, the mesh devices are enable to communicate during the contention-free period (30). Hence, communication between the mesh devices is priorisized so that a high reliability is achieved and utilization of the wireless network (1) is optimized.
摘要:
A wireless network (1) comprises mesh devices and non-mesh devices. A medium access control architecture incorporates at least a point coordination function as an access method, wherein the point coordination function starts a contention-free period (30) with a beacon (32) so that a non-polled transmission by the non-mesh devices is prevented. Further, the mesh devices are enable to communicate during the contention-free period (30). Hence, communication between the mesh devices is priorisized so that a high reliability is achieved and utilization of the wireless network (1) is optimized.
摘要:
A wireless network (1) comprises basic service sets (6, 7) and a distribution system (8). Each of the basic service sets (6, 7) comprises stations (2, 3) and stations (4, 5), respectively. Thereby, data is moved between their basic service sets (6, 7) and said distribution system (8) via access points (10, 11), which are also stations (3, 4). A medium access control architecture incorporating a distributed coordination function as an access method is provided. Thereby, a normal mode and a mesh mode are provided. Thereby, normal mode is used to transmit data between stations (2, 3; 4, 5) within each of the basic service sets (6; 7). In mesh mode, data is transmitted between the access points (10, 11). To priorize transmission within the distribution system (8) the stations (2, 5), which are not mesh devices, are silence during mesh mode. Therefor, one of the access points (10, 11) sends a request to send in which the address of the access point (10, 11) is used as both the transmitter address and the receiver address of this request to send.
摘要:
A method of allocating frequency channels in a wireless communication system comprising common channel framework enabled stations, said method comprising: —using by said common channel framework enabled stations a common frequency channel at common time intervals in order to determine a communication frequency channel on which a pair of common channel framework enabled stations will be allowed to exchange data frames, —periodically changing the common frequency channel at the beginning of each common time interval.
摘要:
A method of congestion management in a wireless mesh network in which the CSMA/CA algorithm is used to access wireless medium, said network comprising a first station and at least one neighboring station able to communicate directly with the first station, comprises: —broadcasting (22) an announcement message by the first station to the at least one neighboring station when the first station experiences a congestion in its environment, said announcement message comprising a congestion level parameter, —activating (26) by the neighboring station, at reception of the announcement message, a congestion state in which the minimum size of the time window, called contention window, to access the medium before transmission of a message is strictly greater than the minimum size (CWmin) defined in absence of congestion, said minimum size in congestion state being defined as a function of the congestion level parameter.
摘要:
A method of allocating frequency channels in a wireless communication system comprising commo n channel framework enabled stations, said method comprising: —using by said common channel framework enabled stations a common frequency channel at common time intervals in order to determine a communication frequency channel on which a pair of common channel framework enabled stations will be allowed to exchange data frames, —periodically changing the common frequency channel at the beginning of each common time interval.
摘要:
The present invention relates to a method of generating a message by a station in a network in which stations 5 transmit by intervals (A) for reporting to other stations (B) of reservations of a medium in an interval, wherein the station: —generates a set (10) of reservation information elements (A.1-A.n) wherein each reservation information element (A.1-A.n) identifies one of said reservations in the interval; and —creates at least one message (21-24) containing reservation information elements (A.1-A.n); —transmits the message to other stations (B).
摘要:
The present invention relates to a method of generating a message by a station in a network in which stations 5 transmit by intervals (A) for reporting to other stations (B) of reservations of a medium in an interval, wherein the station: —generates a set (10) of reservation information elements (A.1-A.n) wherein each reservation information element (A.1-A.n) identifies one of said reservations in the interval; and —creates at least one message (21-24) containing reservation information elements (A.1-A.n); —transmits the message to other stations (B).
摘要:
A method of congestion management in a wireless mesh network in which the CSMA/CA algorithm is used to access wireless medium, said network comprising a first station and at least one neighbouring station able to communicate directly with the first station, comprises:—broadcasting (22) an announcement message by the first station to the at least one neighbouring station when the first station experiences a congestion in its environment, said announcement message comprising a congestion level parameter,—activating (26) by the neighbouring station, at reception of the announcement message, a congestion state in which the minimum size of the time window, called contention window, to access the medium before transmission of a message is strictly greater than the minimum size (CWmin) defined in absence of congestion, said minimum size in congestion state being defined as a function of the congestion level parameter
摘要:
The present invention relates to a method for transmitting frames from a transmitting mesh device to a receiving mesh device in a mesh network, comprising: storing frames received in the transmitting mesh device from a source mesh device and intended for a destination mesh device in a relay queue, the source mesh device and the destination mesh device being different from the transmitting device, storing frames generated by the transmitting mesh device in a local queue, different from the relay queue, selecting a frame from the relay queue or local queue based on a predetermined scheduling strategy, -transmitting the selected frame to the receiving mesh device.