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Block acknowledgement request apparatus, systems, and methodsRelated Patent Categories: Error Detection/correction And Fault Detection/recovery, Pulse Or Data Error Handling, Digital Data Error Correction, Request For Retransmission, Retransmission If No Ack ReturnedBlock acknowledgement request apparatus, systems, and methods description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070011554, Block acknowledgement request apparatus, systems, and methods. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND [0001] The inventive subject matter pertains to communication systems and, more particularly, to wireless transmission and reception of data in a communication system. [0002] In modern communication systems, data typically is sent in packet form from one communication node through a network to another communication node. These packets typically include one or more headers and a payload, which is the useful data to be sent, received and used by the communication nodes. Such data transmissions in a Media Access Control (MAC) protocol may take place at a relatively low transmission rate. [0003] During transmit and receive operations, handshaking occurs to acknowledge the proper receipt of transmitted data. An acknowledgement is typically requested by a transmitting node after sending a block of data. If errors occur, an error acknowledgement is returned to the transmitting node, and the data is transmitted. [0004] Often the acknowledgement request must be repeated. The acknowledgement request may be repeated in subsequent physical layer protocols, thereby further lowering the overall transmission rate. DESCRIPTION OF THE DRAWINGS [0005] FIG. 1 is a block diagram of a communication system in accordance with various embodiments of the present invention. [0006] FIG. 2 is a layout of a media access control protocol header depicting various embodiments for implementing a block acknowledgement request. [0007] FIG. 3 is a table layout of an indicator of the media access control protocol header depicting various embodiments of the present invention. [0008] FIG. 4 is a layout of a multiple-frame data block in accordance with various embodiments of the present invention. [0009] FIG. 5 is a flowchart of various transmission methods for block acknowledgement control in accordance with various embodiments of the present invention. [0010] FIG. 6 is a flowchart of various reception methods for block acknowledgement control in accordance with various embodiments of the present invention. DETAILED DESCRIPTION [0011] FIG. 1 is a block diagram of a communication system 100 in accordance with various embodiments of the present invention. The communication system 100 has a wireless transmitter 10. The wireless transmitter 10 is coupled to an analog-to-digital/digital-to-analog converter (ADC) and a transmitter/receiver (Tx/Rx) 11. The ADC &Tx/Rx 11 converts signals from digital to analog in the transmit direction and from analog to digital in the receive direction of wireless transmitter 10. Wireless transmitters is also coupled to a processor 13. Processor 13 control operation of transmitter 10. [0012] ADC &Tx/Rx 11 is coupled to an antenna 12. Antenna 12 may be a directional or omni-directional antenna, including, for example and not by way of limitation, a dipole antenna, a monopole antenna, a patch antenna, a loop antenna, a microstrip antenna, or various other types of antennas suitable for transmission and/or reception of data signals. In some embodiments, the wireless transmitter may have multiple antennas. [0013] The communication system 100 also has a wireless receiver 20. Wireless receiver 20 is coupled to an analog-to-digital/digital-to-analog converter (ADC) and transmitter/receiver (Tx/Rx) 21. ADC &Tx/Rx 21 converts signals from digital to analog in the transmit direction and from analog to digital in the receive direction of wireless receiver 20. Wireless receiver 20 is also coupled to processor 23. Processor 23 controls operation of receiver 20. [0014] ADC &Tx/Rx 21 is coupled to an antenna 22. Antenna 22 may be a directional or omni-directional antenna, including, for example and not by way of limitation, a dipole antenna, a monopole antenna, a patch antenna, a loop antenna, a microstrip antenna, or various other types of antennas suitable for transmission and/or reception of data signals. In some embodiments, the wireless receiver 20 may have multiple antennas. [0015] Wireless network 30 couples the transmitter 10 to the receiver 20 for the transfer of data. The roles of the transmitter 10 and the receiver 20 may be reversed, in that the transmitter 10 may receive and the receiver 20 may transmit data. Wireless network 30 may be a single wireless network in one embodiment, or in other embodiments wireless network 30 may be any combination of wireless and wireline networks. Wireless network 30 may in other embodiments comprise a wireless local area network (WLAN), wireless personal area network (WPAN) and/or wireless metropolitan area network (WMAN). [0016] Communication system 100 of FIG. 1 may be one in which the Standards of the Institute of Electrical and Electronic Engineering (IEEE), Standards 802.11, published in 1998 together with subsequent amendments apply. The IEEE 802.11 Standard currently provides a definition for media access control (MAC) headers and services. In 2003, an IEEE 802.11 Task Group n (TGn) was created. TGn's objective is to define modifications to the Physical Layer (PHY) and MAC layer to deliver a throughput of at least 100 megabits per second. The IEEE 802.11n Standards are currently at the proposal stage. Several proposals exist. A further objective of the 802.11n Standards is to be downward-compatible with Standards 802.11 a/b/g. [0017] Previous standards, such as the draft IEEE 802.11e standard, call for a handshaking arrangement between transmitter and receiver. In this arrangement, a block of data frames is sent, but each individual data frame is sent as a separate transmission. Each data frame has it's acknowledge (ack) policy set to "1, 1," indicating block acknowledgement (BA). Next, the originator sends a separate block acknowledgement request (BAR) frame to solicit a BA response. The recipient then, in turn, responds with a (BA) frame. [0018] The transmitter may also choose to solicit a normal acknowledgement for an individual data frame. This is achieved by setting the ack policy on an individual data frame to "0, 0" which will cause the recipient to respond with a normal ack (acknowledge) frame. [0019] With the high data rate desired for IEEE Standard 802.11n, scope exists for improving the efficiency of this exchange. One key enhancement is the aggregation of multiple data frames into a single transmission. When doing this, the conventional acknowledgement mechanism described may be modified to improve efficiency further. [0020] In an embodiment of the invention, wireless transmitter may perform non-aggregate or aggregate transmissions. In an aggregate transmission, wireless transmitter 10 aggregates one or more data frames into a block that is then sent as a single transmission. An aggregate transmission is signaled either implicitly by the nature of the transmission or explicitly with a signaling field at the head of the transmission. [0021] If a block acknowledgement is required for the aggregated data, then the wireless transmitter 10 will set the ack policy in each data frame in the aggregate transmission to "0, 0" (normal ack policy). Continue reading about Block acknowledgement request apparatus, systems, and methods... Full patent description for Block acknowledgement request apparatus, systems, and methods Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Block acknowledgement request apparatus, systems, and methods patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. 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