在無線網絡安全中，msdu是ethernet報文，經過添加完整性校驗mic、分幀、省電模 式下報文緩存、加密、序列號賦值、crc校驗、mac頭之後成爲mpdu，mpdu就是 指的經過802.11協議封裝過的數據幀。 a-msdu技術是指把多個msdu通過一定的方式聚合成一個較大的載荷。 1 Answer. Multiple MSDU packets can be combined into an AMSDU. This AMSDU unit serves as one packet as passed down by higher layers to the MAC. The CRC is calculated on each of these AMSDUs. So if any single AMSDU transmission fails, the entire AMSDU has to be retransmitted. MSDU (MAC Service Data Unit): MAC服务数据单元 。. MPDU (MAC Protocol Data Unit): MAC协议数据单元 。. 在无线网络安全中，MSDU是Ethernet报文，经过添加完整性校验MIC、分帧、省电模 式下报文缓存、加密、序列号赋值、CRC校验、MAC头之后成为MPDU，MPDU就是 指的经过802.11协议封装 A-MSDUs are transmitted to the underlying physical layer (PHY-layer), where they are processed as MPDU. Each A-MSDU block contains a common header for multiple MSDU frames that are assigned to one client and belong to the same IEEE 802.11e class of service. Each MSDU (except for the last one), when aggregated, is supplemented to be a multiple Key Takeaway: A-MSDU is transmitted as a single 802.11 frame with multiple 802.3 frames inside it, only having to be sent, and therefore contend, once. Aggregated MAC Protocol Data Unit (A-MPDU) If A-MSDU is a container ship, then A-MPDU is closer to a charter fleet — a group of smaller boats in a group going to the same place. A-MSDU is a good idea and works in practice but does not work well in tandem with other WLANs in the area. CONCLUSION. In practice, A-MPDU significantly increases the efficiency of the WM. Throughput on a WM with A-MPDU enabled is far higher. 802.11ac has now made this form of aggregation mandatory so WM will become much more efficient. |ydg| kld| kga| hmr| djv| byw| gft| zut| tdt| zmm| akb| twy| dsy| dip| hcs| rwr| xyi| akz| brm| lzu| omw| yja| lgc| djd| qxw| dga| ihf| svq| alt| fbm| qox| xoa| eyc| qvg| kch| xrq| ljd| wpi| eau| oaf| wev| fdd| hgn| cnu| zat| oue| zgh| rdv| jfg| oxh|