(12) Ullltfild States P2116111 (10) Patent No.: US 7,978,672 B2 Draves, Jr. et al. (45) Date of Patent: Jul. 12, 2011 (54) SYSTEM AND METHOD FOR LINK QUALITY 2002/0039357 Al * 4/2002 Li_pasti ct al. ............... .. 370/338 SOURCE ROUTING 2°03/0202476 A1* 1°/2°03 Billhm eH11~ ~~~~~~~~~~~~ ~~ 37°/236 2003/0212821 A1 11/2003 Gillies et al. . 2004/0022223 A1 2/2004 Bllhart (75) Inventors? R1cha1'd_P9Well ]_)1'aVess Jr-= Sean1e= WA 2004/0025013 A1* 2/2004 Hlaas e[Za1_ ,,,,,,,,,,,,,,,,,, H 713/163 (US); Brlall D- Z111, Redmond, WA 2004/0032847 Al 2/2004 Cain (US); Jitendra D. Padhye, Kirkland, 2004/0156345 A1* 8/2004 Steer et al. 370/338 WA (US) 2004/0190468 A1* 9/2004 Saijonmaa ...... .. 370/312 2004/0213198 A1* 10/2004 Mahmood et al. .......... .. 370/349 . . . 2004/0264503 A1 12/2004 D (73) Asslgnea Mlcrosoft Corlwratlons Redmond: WA 2005/0036436 A1* 2/2005 Sgfijfggju et 31, jjjjjjjjjj N 370/339 (US) 2005/0036616 Al 2/2005 Huang et al. _ _ _ _ _ 2005/0041591 A1* 2/2005 Duggi et al. ................ .. 370/238 ( * ) Notice: Subject to any disclaimer, the term of tlns (Continued) patent is extended or adjusted under 35 U~S~C~ 1540’) '-“Y 0 d*‘YS~ OTHER PUBLICATIONS (21) Appl. No.: 12/689,626 Adya et al., “A Multi-Radio Unification Protocol for IEEE 802.11 _ Wireless Networks,” Technical Repoit MSR-TR-2003-44. Microsoft (22) Bled? Jam 191 2010 Research, Redmond, WA, Jul. 2003. (65) Prior Publication Data (COnIinL16d) Us 2010/0118727 A1 May 13’ 2010 Primary Examiner — Brian D Nguyen Related U_s_ Application Data gé) Attorney, Agent, or Firm — Wolf, Greenfield & Sacks, (60) Continuation of application No. 11/906,497, filed on i i '2, 2007, now_ Pat. No. 7,680,091, which is a (57) ABSTRACT dlvlslon of apphcanon N0 10/784587’ filed on Feb S stems and methods for routin ackets b nodes in an ad Y g P Y 23, 2004, now Pat. No. 7,376,122. . . . . . hoc network in accordance with a link quality source routing (51) Int CL proitocol are disclosed. Routg discovgry, route II12l1I1I€(I112E1C€, H04W 4/00 (200901) an metric maintenance are esigne to propagatean eep <52) U.S. Cl. ...................................... .. 370/338; 370/352 ijgjgésglfgacqfiujglgy jggjillgfjffilz~th1§j§§dg:1§§§$§e (58) Field of Classification Search ................ .. 370/252, using to route packgfs and a proactive mechanism for J 370/328’ 338’ 352’ 351’ 469’ 471’ 389’ 392’ links Nodes are confi i red to include a send buffer a main370/229, 230, 235 ' b ff gu bl 1.nk 1. . ’ d 1 See application file for complete search history tenance u er’ a re-quest ta e’ 1 qua Hy meme mo. u es’ ' and preferably a neighbor cache and a link cache. The inven(56) References Cited tion allows for asymmetric links in the network. The inven
7,065,376 B2 6/2006 Wolman et al.
7,092,391 B2* 8/2006 Umeda ....................... .. 370/392
7,184,421 B1 2/2007 Liu et al.
7,310,335 B1* 12/2007 Garcia-Luna-Aceves
et al. ........................... .. 370/390
tion may be implemented within a virtual protocol interlayer between the link and network layers. The invention may employ any particular link quality metrics, including metrics based on probing techniques as well as metrics based on knowledge gained in other ways.
18 Claims, 9 Drawing Sheets
U.S. PATENT DOCUMENTS 2005/0147114 A1* 7/2005 Stewart et al. .............. .. 370/432
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LAYER 3 IP IPX NetBEUI --201 LQSR —203
LAYER 2 802.11 802.16 802.3 -—-205
\2\1 3 215 >17
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