Source: http://www.google.com/patents/US8027366?dq=6,240,376
Timestamp: 2016-12-03 10:43:01
Document Index: 14918995

Matched Legal Cases: ['art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 16']

Patent US8027366 - Technique for reducing physical layer (PHY) overhead in wireless LAN systems - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA physical layer (PHY) packet aggregation technique may be used to reduce the percentage of PHY overhead in data transmission in order to achieve better PHY efficiency and higher throughput. Higher layer packets in an upper layer data queue may be fragmented into appropriate small-size sub-packets, which...http://www.google.com/patents/US8027366?utm_source=gb-gplus-sharePatent US8027366 - Technique for reducing physical layer (PHY) overhead in wireless LAN systemsAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS8027366 B1Publication typeGrantApplication numberUS 12/703,288Publication dateSep 27, 2011Filing dateFeb 10, 2010Priority dateNov 19, 2003Fee statusPaidAlso published asUS7701975Publication number12703288, 703288, US 8027366 B1, US 8027366B1, US-B1-8027366, US8027366 B1, US8027366B1InventorsHsiao-Cheng Tang, Ravi Narasimhan, Hemanth SampathOriginal AssigneeMarvell International Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (5), Non-Patent Citations (14), Referenced by (9), Classifications (10), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetTechnique for reducing physical layer (PHY) overhead in wireless LAN systems
FIG. 1 illustrates a wireless multiple-in-multiple-out (MIMO) communication system 100, which includes a first transceiver 102 with MT transmit (TX) antennas 104 and a second transceiver 106 with MR receive (RX) antennas 108, forming an MR×MT MIMO system. For the description below, the first transceiver 102 is designated as a “transmitter” because the transceiver 102 predominantly transmits signals to the transceiver 106, which predominantly receives signals and is designated as a “receiver”. Despite the designations, both “transmitter” 102 and “receiver” 106 may include a transmit section 110 and a receive section 112 and may transmit and receive data. The antennas in the transmitter 102 and receiver 106 communicate over channels in a wireless medium. In FIG. 1, H 120 represents the reflections and multi-paths in the wireless medium
The length of the aggregated PHY packet may be selected based on several parameters. These parameters may include channel coherence time, channel availability (TXOP (Transmission Opportunity)), and quality of service (QoS) requirements such as delay and latency constraints. In an embodiment, the aggregated PHY packet may be less than 1/X of the channel coherence (which is inversely proportional to the Doppler spread of the channel), where X is a programmable number. For example, for X=20, a 10 Hz Doppler dictates that the packet length should be less than 1/20×0.1 sec=5 msec. The length of the aggregated PHY packet may dictate the number (M) of sub-packets 402 in the aggregated PHY packet.
FIG. 6 shows the results of a simulation comparing the percentage of PHY overhead obtained with the packet aggregation scheme 602 and without the packet aggregation scheme 604 (as a function of packet size). The simulation was of a 3×3 MIMO 802.11n system using an EDCF (Enhanced Distributed Coordination Function) MAC protocol (802.11e MAC). The following assumptions were made: PHY data rate=54*3=162 Mbps; Doppler=10 Hz, leading to a channel coherence time of 100 msec and a maximum aggregated PHY packet spanning a maximum of 5 msec; sub-packet 402 body size (data unit 404)=MPDU body size; EDCF protocol is implemented with the block ACK feature enabled; and transmission assumes a queue with 64 MPDUs. As the plot shows, the packet aggregation scheme resulted in significant overhead improvement for the entire range of packet size.
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2013Samsung Electronics Co., LtdApparatus and method for indicating a packet error in an audio and video communication systemUS8804611 *Aug 4, 2009Aug 12, 2014Qualcomm IncorporatedMethod and apparatus for acknowledging successful reception of a data transmission for multi-access compatibility in a wireless communication systemUS9118426 *May 24, 2013Aug 25, 2015Electronics And Telecommunications Research InstitutePacket transmission/reception method and apparatus in wireless communication systemUS20100202347 *Aug 4, 2009Aug 12, 2010Qualcomm IncorporatedMethod and apparatus for acknowledging successful reception of a data transmission for multi-access compatibility in a wireless communication systemUS20110280182 *Mar 11, 2011Nov 17, 2011Electronics And Telecommunications Research InstitutePacket transmission/reception method and apparatus in wireless communication systemUS20120144265 *Dec 6, 2011Jun 7, 2012Samsung Electronics Co., Ltd.Apparatus and method for indicating a packet error in an audio and video communication systemUS20130258937 *May 24, 2013Oct 3, 2013Electronics And Telecommunications Research InstitutePacket transmission/reception method and apparatus in wireless communication systemWO2014182344A1 *Dec 28, 2013Nov 13, 2014Intel IP CorporationMethods and arrangements to signal an acknowledgement policy in a short frame* Cited by examinerClassifications U.S. Classification370/474, 370/339, 370/252, 370/338International ClassificationH04L12/56, H04J1/16Cooperative ClassificationH04L1/0079, H04L1/1628European ClassificationH04L1/00F1, H04L1/16F5Legal EventsDateCodeEventDescriptionMar 27, 2015FPAYFee paymentYear of fee payment: 4RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services