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Trigger frames adapted to packet-based policies in an 802.11 network

專(zhuān)利號(hào)
US10980060B2
公開(kāi)日期
2021-04-13
申請(qǐng)人
CANON KABUSHIKI KAISHA（JP Tokyo）
發(fā)明人
Stéphane Baron; Romain Guignard; Pascal Viger; Patrice Nezou
IPC分類(lèi)
H04W74/08; H04W72/12; H04W84/12; H04W74/06; H04W28/26
技術(shù)領(lǐng)域
rus,ru,txop,nodes,traffic,tf,ap,node,in,channel
地域： Tokyo

摘要

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.

說(shuō)明書(shū)

OFDMA to provide multi-user transmission in 802.11ax requires accurate inter-user symbol synchronization to keep the orthogonality among the different OFDMA sub-channels or RUs.

In addition, the various nodes transmitting PPDUs on the RUs have to synchronize the end of their PPDUs transmission, Otherwise, if a node ends its transmission earlier, the unused RU could be acquired by an OBSS (Overlapping Base Station Subsystem) node, which may then initiate a new transmission.

This may cause interference with the following Block Acknowledgements (BAs) sent by the AP to the nodes.

This may also disturb the AP when receiving of the other on-going PPDUs.

To synchronize the end of their PPDUs transmission, the nodes must send data on their RUs until the end of the TXOP time duration indicated in the trigger frame. In practice, the nodes starts sending padding data (as defined in the document IEEE 802.11-15/617) if they end transmitting payload data before the end of the TXOP.

The bandwidth or width of the targeted composite channel is also signalled in the TF frame, meaning that the 20, 40, 80 or 160 MHz value is added. The TF frame is sent over the primary 20 MHz channel and duplicated (replicated) on each other 20 MHz channels forming the targeted composite channel. As described above for the duplication of control frames, it is expected that every nearby legacy node (non-HT or 802.11ac nodes) receiving the TF on its primary channel, then sets its NAV to the TXOP duration value specified in the TF frame. This prevents these legacy nodes from accessing the channels of the targeted composite channel during the TXOP.

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