This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. Please help improve this article by introducing more precise citations.(February 2012) (Learn how and when to remove this message)
For more information about wireless LAN protocols (such as Wi-Fi), see IEEE 802.11.
Block acknowledgement (BA) was initially defined in IEEE 802.11e as an optional scheme to improve the MAC efficiency. 802.11n amendment ratified in 2009 enhances this BA mechanism then made it as mandatory to support by all 802.11n-capable devices (formally known as HT - High Throughput devices).
Instead of transmitting an individual ACK for every MPDU (i.e., frame), multiple MPDUs can be acknowledged together using a single BA frame. Block Ack (BA) contains bitmap size of 64*16 bits. These 16 bits accounts the fragment number of the MPDUs to be acknowledged. Each bit of this bitmap represent the status (success/failure) of a MPDU.
Block acknowledgement consist of a setup and tear-down of the session phases. In the setup phase, capability information such as buffer size and BA policy are negotiated with the receiver. Once the setup phase completed, the transmitter can send frames without waiting for ACK frame. Finally the BA session is torn down with a so-called DELBA frame.[1]
^Computer Society, IEEE (2016). Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications(PDF). New York: IEEE. p. 1415. ISBN 978-1-5044-3645-8.
and 20 Related for: Block acknowledgement information
Blockacknowledgement (BA) was initially defined in IEEE 802.11e as an optional scheme to improve the MAC efficiency. 802.11n amendment ratified in 2009...
Lower Transport Layer This layer defines a reliable (through a BlockAcknowledgement) Segmented transmission upper layer packets, when a complete upper...
bells to box A. (Acknowledgement, if in the position to accept the train giving permission for box A to signal the train into the block controlled by B...
packet 99 again on the receipt of another data packet. This duplicate acknowledgement is used as a signal for packet loss. That is, if the sender receives...
framing formats.[citation needed] ACK0 and ACK1 (even/odd affirmative acknowledgement) are encoded as two characters—DLE '70'x, and DLE / for EBCDIC, DLE...
packet (either a block of data, or an 'acknowledgement') alternatively in flight on the network at any time. Due to this single data block strategy instead...
novelist Upstairs in the Crazy House Cliff Cardinal playwright The Land Acknowledgement Opal Carew 1956 romantic novelist His To Possess Dave Carley 1953 playwright...
contains the sender-specific heartbeat info Chunk type For heartbeat acknowledgement (HEARTBEAT ACK), this value is always 5. Chunk flags There are currently...
Spaghetti code – Software source code with poor structure "Chapel spec (Acknowledgements)" (PDF). Cray Inc. October 1, 2015. Archived (PDF) from the original...
Kingdom to describe a group – or generation – of universities (in an acknowledgement of the term red brick universities, used for an older generation of...
request, and IP lease acknowledgement. These stages are often abbreviated as DORA for discovery, offer, request, and acknowledgement. The DHCP operation...
corresponding acknowledgement message. 1 : Non-confirmable : This message does not expect a confirmation message. Response 2 : Acknowledgement : This message...
Japan. HarperCollins. p. 195. ISBN 978-8172236502. Indeed, Beijing's acknowledgement of Indian control over Sikkim seems limited to the purpose of facilitating...
stored in a MySQL database using Gizzard, and the user receives an acknowledgement that the tweets were sent. Tweets are then sent to search engines via...
Spielberg, who sent Mooney, Bennett, Rutherford, and McCary a personal acknowledgement after being impressed with the Hook parody, Unbelievable Dinner. He...
Black Lives Matter movement. It is a conservative rejection of the acknowledgement of police brutality and ethnic violence that is the purpose of the...
which tries to forward it to the addressee, and repeatedly requests acknowledgement of receipt. When the message is acknowledged, the server deletes it;...
Global Information