Trigger frames adapted to packet-based policies in an 802.11 network
摘要
說明書
A result of the learning phase is that the width of each RU and the allocation of each RU to a dedicated node can be defined precisely according to current network usage. Preferably, the RU frequency width is chosen based on traffic types, but also based on the modulation scheme because the latter can greatly modify the transmission duration required for a fixed data quantity (for instance modulation MCS 0 provides a bitrate of 6.5 Mbps, while modulation MCS 1 provides a bitrate of 13 Mbps).
Next, the Scheduled RU mode is used where the AP explicitly allocates the designed RUs to specific nodes based on node's needs (for instance transmitted during a previous TXOP; or the AP may use traffic specification, e.g. TSPEC in HCCA, supplied by some nodes to define their need).
The ‘RU Information Element’ (1510) is used by the AP to embed additional information inside the trigger frame related to the OFDMA TXOP. It format preferably follows the ‘Vendor Specific information element’ format as defined in the IEEE 802.11-2007 standard.
The ‘RU Information Element’ (1510) is a container of one or several RU attributes (1520), having each a dedicated attribute ID for identification. The header of RU IE can be standardized (and thus easily identified by the nodes) through the Element ID, OUI, OUI Type values.
The RU attributes 1520 are defined to have a common general format consisting of a one-byte RU Attribute ID field, a two-byte Length field and variable length attribute specific information fields.
