{"id":1919,"date":"2026-04-14T19:58:58","date_gmt":"2026-04-14T11:58:58","guid":{"rendered":"http:\/\/www.preluna.xyz\/?p=1919"},"modified":"2026-04-14T20:30:35","modified_gmt":"2026-04-14T12:30:35","slug":"%e6%95%b0%e6%8d%ae%e9%93%be%e8%b7%af%e5%b1%82%e4%b8%ad%ef%bc%8c%e6%b5%81%e9%87%8f%e6%8e%a7%e5%88%b6%e4%b8%8e%e5%8f%af%e9%9d%a0%e4%bc%a0%e8%be%93%e5%85%b6%e5%ae%9e%e6%98%af%e4%b8%80%e6%9d%a1%e7%ba%bf","status":"publish","type":"post","link":"http:\/\/www.preluna.xyz\/index.php\/2026\/04\/14\/%e6%95%b0%e6%8d%ae%e9%93%be%e8%b7%af%e5%b1%82%e4%b8%ad%ef%bc%8c%e6%b5%81%e9%87%8f%e6%8e%a7%e5%88%b6%e4%b8%8e%e5%8f%af%e9%9d%a0%e4%bc%a0%e8%be%93%e5%85%b6%e5%ae%9e%e6%98%af%e4%b8%80%e6%9d%a1%e7%ba%bf\/preluna\/text\/","title":{"rendered":"\u6570\u636e\u94fe\u8def\u5c42\u4e2d\uff0c\u6d41\u91cf\u63a7\u5236\u4e0e\u53ef\u9760\u4f20\u8f93\u5176\u5b9e\u662f\u4e00\u6761\u7ebf\u4e0a\u7684\u4e24\u4ef6\u4e8b"},"content":{"rendered":"\n<p>\u8fd9\u4e00\u5757\u5728 408 \u91cc\u975e\u5e38\u5bb9\u6613\u201c\u8d8a\u5b66\u8d8a\u4e71\u201d\uff0c\u56e0\u4e3a\u9898\u76ee\u4f1a\u628a\u505c\u6b62-\u7b49\u5f85\u3001\u6ed1\u52a8\u7a97\u53e3\u3001ARQ\u3001\u53d1\u9001\u7a97\u53e3\u3001\u63a5\u6536\u7a97\u53e3\u3001\u5e8f\u53f7\u4f4d\u6570\u3001\u4fe1\u9053\u5229\u7528\u7387\u8fd9\u4e9b\u5185\u5bb9\u6df7\u5728\u4e00\u8d77\u8003\u3002\u771f\u6b63\u628a\u4e3b\u7ebf\u7406\u987a\u4e4b\u540e\uff0c\u4f1a\u53d1\u73b0\u5b83\u4eec\u5e76\u4e0d\u662f\u96f6\u6563\u77e5\u8bc6\u70b9\uff0c\u800c\u662f\u540c\u4e00\u4e2a\u95ee\u9898\u7684\u4e0d\u540c\u4fa7\u9762\u3002<\/p>\n\n\n\n<p>\u5148\u628a\u6700\u6838\u5fc3\u7684\u4e00\u53e5\u8bdd\u653e\u5728\u524d\u9762\uff1a<\/p>\n\n\n\n<p>\u6570\u636e\u94fe\u8def\u5c42\u4e00\u65b9\u9762\u8981\u89e3\u51b3\u201c\u522b\u628a\u63a5\u6536\u65b9\u538b\u57ae\u201d\uff0c\u8fd9\u53eb\u6d41\u91cf\u63a7\u5236\uff1b\u53e6\u4e00\u65b9\u9762\u8981\u89e3\u51b3\u201c\u5e27\u4e22\u4e86\u3001\u9519\u4e86\u8981\u80fd\u6062\u590d\u201d\uff0c\u8fd9\u53eb\u53ef\u9760\u4f20\u8f93\u3002<br>\u800c\u505c\u6b62-\u7b49\u5f85\u3001GBN\u3001SR\uff0c\u672c\u8d28\u4e0a\u90fd\u662f\u201c\u6d41\u91cf\u63a7\u5236 + \u5dee\u9519\u63a7\u5236 + \u5e8f\u53f7\u673a\u5236\u201d\u7ed3\u5408\u540e\u7684\u5177\u4f53\u534f\u8bae\u5f62\u5f0f\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\u8fd9\u90e8\u5206\u6700\u597d\u7684\u590d\u4e60\u65b9\u5f0f\uff0c\u4e0d\u662f\u4e00\u4e2a\u4e2a\u80cc\u534f\u8bae\uff0c\u800c\u662f\u6cbf\u7740\u4e0b\u9762\u8fd9\u6761\u94fe\u53bb\u7406\u89e3\uff1a<\/p>\n\n\n\n<p>\u53d1\u9001\u5f97\u591a\u5feb \u2192 \u63a5\u6536\u65b9\u80fd\u4e0d\u80fd\u8ddf\u4e0a \u2192 \u51fa\u9519\u540e\u600e\u4e48\u8865\u6551 \u2192 \u9700\u8981\u591a\u5927\u7684\u7a97\u53e3 \u2192 \u9700\u8981\u591a\u5c11\u4f4d\u7f16\u53f7 \u2192 \u6700\u7ec8\u4fe1\u9053\u5229\u7528\u7387\u662f\u591a\u5c11\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u5148\u628a\u51e0\u4e2a\u6700\u5bb9\u6613\u6df7\u6dc6\u7684\u6982\u5ff5\u62c6\u5f00<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u505c\u6b62-\u7b49\u5f85\u201c\u6d41\u91cf\u63a7\u5236\u201d\u4e0e\u505c\u6b62-\u7b49\u5f85\u201c\u534f\u8bae\u201d\u4e0d\u662f\u5b8c\u5168\u4e00\u56de\u4e8b<\/h3>\n\n\n\n<p>\u5f88\u591a\u9898\u4f1a\u9ed8\u8ba4\u628a\u8fd9\u4e24\u4e2a\u6df7\u7740\u8bf4\uff0c\u4f46\u4e25\u683c\u4e00\u70b9\u770b\uff0c\u5b83\u4eec\u6709\u5c42\u6b21\u5dee\u522b\u3002<\/p>\n\n\n\n<p>\u505c\u6b62-\u7b49\u5f85\u6d41\u91cf\u63a7\u5236\uff0c\u5f3a\u8c03\u7684\u662f\u53d1\u9001\u65b9\u6bcf\u53d1 1 \u5e27\uff0c\u5c31\u5148\u505c\u4e0b\u6765\uff0c\u7b49\u5bf9\u65b9\u201c\u5141\u8bb8\u201d\u518d\u53d1\u4e0b\u4e00\u5e27\u3002\u5b83\u89e3\u51b3\u7684\u662f\u201c\u522b\u53d1\u592a\u5feb\u201d\u3002<\/p>\n\n\n\n<p>\u505c\u6b62-\u7b49\u5f85\u534f\u8bae\u5982\u679c\u518d\u52a0\u4e0a\u786e\u8ba4\u3001\u8d85\u65f6\u91cd\u4f20\u3001\u5e27\u7f16\u53f7\uff0c\u90a3\u4e48\u5b83\u5c31\u53d8\u6210\u4e86\u505c\u6b62-\u7b49\u5f85 ARQ\u3002\u5b83\u4e0d\u4ec5\u80fd\u63a7\u6d41\uff0c\u8fd8\u80fd\u4fdd\u8bc1\u53ef\u9760\u4f20\u8f93\u3002<\/p>\n\n\n\n<p>\u4e5f\u5c31\u662f\u8bf4\uff1a<\/p>\n\n\n\n<p>\u505c\u6b62-\u7b49\u5f85\u6d41\u91cf\u63a7\u5236 = \u6700\u6734\u7d20\u7684\u201c\u53d1\u4e00\u5e27\u7b49\u4e00\u5e27\u201d<br>\u505c\u6b62-\u7b49\u5f85 ARQ = \u5728\u201c\u53d1\u4e00\u5e27\u7b49\u4e00\u5e27\u201d\u7684\u57fa\u7840\u4e0a\uff0c\u52a0\u4e0a\u786e\u8ba4\u3001\u7f16\u53f7\u3001\u8d85\u65f6\u91cd\u4f20<\/p>\n\n\n\n<p>\u5728\u8003\u9898\u91cc\uff0c\u9ed8\u8ba4\u8bf4\u201c\u505c\u6b62-\u7b49\u5f85\u534f\u8bae\u201d\uff0c\u901a\u5e38\u5c31\u662f\u540e\u8005\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">ARQ \u7684\u4e09\u79cd\u5178\u578b\u534f\u8bae\uff0c\u5176\u5b9e\u5c31\u662f\u4e09\u79cd\u7a97\u53e3\u6a21\u578b<\/h2>\n\n\n\n<p>ARQ \u5c31\u662f\u81ea\u52a8\u91cd\u4f20\u8bf7\u6c42\u3002\u6570\u636e\u94fe\u8def\u5c42\u5e38\u8003\u7684 ARQ \u6709\u4e09\u7c7b\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u505c\u6b62-\u7b49\u5f85\u534f\u8bae<\/li>\n\n\n\n<li>\u540e\u9000 N \u5e27\u534f\u8bae GBN<\/li>\n\n\n\n<li>\u9009\u62e9\u91cd\u4f20\u534f\u8bae SR<\/li>\n<\/ol>\n\n\n\n<p>\u5982\u679c\u4ece\u201c\u6ed1\u52a8\u7a97\u53e3\u201d\u7684\u89c6\u89d2\u770b\uff0c\u5b83\u4eec\u53ef\u4ee5\u7edf\u4e00\u7406\u89e3\u6210\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u505c\u6b62-\u7b49\u5f85\uff1a\u5355\u5e27\u6ed1\u52a8\u7a97\u53e3<\/li>\n\n\n\n<li>GBN\uff1a\u591a\u5e27\u6ed1\u52a8\u7a97\u53e3\uff0c\u4f46\u63a5\u6536\u65b9\u5f88\u4fdd\u5b88<\/li>\n\n\n\n<li>SR\uff1a\u591a\u5e27\u6ed1\u52a8\u7a97\u53e3\uff0c\u63a5\u6536\u65b9\u4e5f\u6709\u7f13\u5b58\u80fd\u529b<\/li>\n<\/ul>\n\n\n\n<p>\u8fd9\u4e09\u8005\u6700\u8be5\u6bd4\u8f83\u7684\uff0c\u4e0d\u662f\u540d\u5b57\uff0c\u800c\u662f\u4e0b\u9762\u8fd9\u51e0\u9879\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u534f\u8bae<\/th><th>\u53d1\u9001\u7a97\u53e3 W_T<\/th><th>\u63a5\u6536\u7a97\u53e3 W_R<\/th><th>\u786e\u8ba4\u65b9\u5f0f<\/th><th>\u51fa\u9519\u540e\u7684\u5904\u7406<\/th><\/tr><\/thead><tbody><tr><td>\u505c\u6b62-\u7b49\u5f85<\/td><td>1<\/td><td>1<\/td><td>\u9010\u5e27\u786e\u8ba4<\/td><td>\u91cd\u4f20\u5f53\u524d\u5e27<\/td><\/tr><tr><td>GBN<\/td><td>&gt;1<\/td><td>1<\/td><td>\u7d2f\u8ba1\u786e\u8ba4<\/td><td>\u4ece\u51fa\u9519\u5e27\u5f00\u59cb\uff0c\u628a\u540e\u9762\u7684\u5df2\u53d1\u5e27\u4e00\u8d77\u91cd\u4f20<\/td><\/tr><tr><td>SR<\/td><td>&gt;1<\/td><td>&gt;1<\/td><td>\u5355\u72ec\u786e\u8ba4<\/td><td>\u53ea\u91cd\u4f20\u51fa\u9519\u6216\u4e22\u5931\u7684\u90a3\u51e0\u5e27<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u8fd9\u5f20\u8868\u51e0\u4e4e\u662f\u8fd9\u4e00\u7ae0\u6700\u91cd\u8981\u7684\u533a\u5206\u8868\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u79cd\u534f\u8bae\u5230\u5e95\u5dee\u5728\u54ea<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u505c\u6b62-\u7b49\u5f85\uff1a\u6700\u7b80\u5355\uff0c\u4f46\u6548\u7387\u6700\u4f4e<\/h3>\n\n\n\n<p>\u53d1\u9001\u65b9\u6bcf\u6b21\u53ea\u80fd\u6709 1 \u5e27\u5904\u4e8e\u201c\u5df2\u53d1\u9001\u4f46\u672a\u786e\u8ba4\u201d\u72b6\u6001\u3002<br>\u6240\u4ee5\u5b83\u7684\u53d1\u9001\u7a97\u53e3\u548c\u63a5\u6536\u7a97\u53e3\u90fd\u7b49\u4e8e 1\u3002<\/p>\n\n\n\n<p>\u4f18\u70b9\u662f\u7ed3\u6784\u7b80\u5355\u3002<br>\u7f3a\u70b9\u662f\u4f20\u64ad\u65f6\u5ef6\u7a0d\u5fae\u4e00\u5927\uff0c\u53d1\u9001\u65b9\u5927\u90e8\u5206\u65f6\u95f4\u90fd\u5728\u201c\u7b49\u201d\uff0c\u4fe1\u9053\u5229\u7528\u7387\u5f88\u4f4e\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\u505c\u6b62-\u7b49\u5f85\u7684\u672c\u8d28\u7f3a\u9677\uff0c\u4e0d\u662f\u201c\u4e0d\u53ef\u9760\u201d\uff0c\u800c\u662f\u201c\u592a\u6162\u201d\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">GBN\uff1a\u53d1\u9001\u65b9\u80fd\u8fde\u7eed\u53d1\uff0c\u4f46\u63a5\u6536\u65b9\u53ea\u8ba4\u6309\u5e8f\u5230\u8fbe<\/h3>\n\n\n\n<p>GBN \u7684\u6838\u5fc3\u7279\u70b9\u662f\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u53d1\u9001\u65b9\u7a97\u53e3\u53ef\u4ee5\u5927\u4e8e 1\uff0c\u53ef\u4ee5\u8fde\u7eed\u53d1\u9001\u591a\u4e2a\u5e27<\/li>\n\n\n\n<li>\u63a5\u6536\u65b9\u7a97\u53e3\u56fa\u5b9a\u4e3a 1<\/li>\n\n\n\n<li>\u63a5\u6536\u65b9\u53ea\u63a5\u6536\u6309\u5e8f\u5230\u8fbe\u7684\u5e27<\/li>\n\n\n\n<li>\u5982\u679c\u67d0\u4e00\u5e27\u4e22\u5931\u6216\u51fa\u9519\uff0c\u90a3\u4e48\u540e\u9762\u5373\u4f7f\u5230\u8fbe\u4e86\uff0c\u63a5\u6536\u65b9\u4e5f\u76f4\u63a5\u4e22\u5f03<\/li>\n\n\n\n<li>\u786e\u8ba4\u91c7\u7528\u7d2f\u8ba1\u786e\u8ba4<\/li>\n<\/ul>\n\n\n\n<p>\u6240\u8c13\u7d2f\u8ba1\u786e\u8ba4\uff0c\u53ef\u4ee5\u8fd9\u6837\u7406\u89e3\uff1a<\/p>\n\n\n\n<p>\u5982\u679c\u5df2\u7ecf\u786e\u8ba4\u5230 4 \u53f7\u5e27\uff0c\u90a3\u4e48\u901a\u5e38\u610f\u5473\u7740 0\u30011\u30012\u30013\u30014 \u90fd\u5df2\u7ecf\u6309\u5e8f\u6b63\u786e\u6536\u5230\u3002<\/p>\n\n\n\n<p>GBN \u7684\u6700\u5927\u95ee\u9898\u662f\uff1a<br>\u4e00\u65e6\u4e2d\u95f4\u67d0\u5e27\u51fa\u9519\uff0c\u540e\u9762\u5f88\u591a\u672c\u6765\u5df2\u7ecf\u53d1\u9001\u51fa\u53bb\u7684\u5e27\u4e5f\u8981\u8ddf\u7740\u91cd\u4f20\uff0c\u6240\u4ee5\u51fa\u9519\u65f6\u4ee3\u4ef7\u5927\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">SR\uff1a\u53d1\u9001\u65b9\u8fde\u7eed\u53d1\uff0c\u63a5\u6536\u65b9\u4e5f\u80fd\u7f13\u5b58\u4e71\u5e8f\u5e27<\/h3>\n\n\n\n<p>SR \u662f\u5728 GBN \u57fa\u7840\u4e0a\u201c\u66f4\u806a\u660e\u201d\u7684\u7248\u672c\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u63a5\u6536\u65b9\u7a97\u53e3\u4e0d\u518d\u662f 1\uff0c\u800c\u662f\u5927\u4e8e 1<\/li>\n\n\n\n<li>\u4e71\u5e8f\u5230\u8fbe\u7684\u5e27\u53ef\u4ee5\u5148\u6536\u4e0b\u3001\u7f13\u5b58\u8d77\u6765<\/li>\n\n\n\n<li>\u6bcf\u4e00\u5e27\u5355\u72ec\u786e\u8ba4<\/li>\n\n\n\n<li>\u771f\u6b63\u4e22\u54ea\u4e00\u5e27\uff0c\u5c31\u53ea\u91cd\u4f20\u54ea\u4e00\u5e27<\/li>\n<\/ul>\n\n\n\n<p>\u6240\u4ee5 SR \u5728\u8bef\u7801\u7387\u8f83\u9ad8\u65f6\u6548\u7387\u660e\u663e\u6bd4 GBN \u9ad8\u3002<br>\u4f46\u4ee3\u4ef7\u662f\u534f\u8bae\u5b9e\u73b0\u66f4\u590d\u6742\uff0c\u56e0\u4e3a\u63a5\u6536\u65b9\u8981\u7f13\u5b58\u4e71\u5e8f\u5e27\uff0c\u53d1\u9001\u65b9\u4e5f\u901a\u5e38\u8981\u7ed9\u6bcf\u4e00\u5e27\u5355\u72ec\u5b9a\u65f6\u3002<\/p>\n\n\n\n<p>\u8fd9\u91cc\u6709\u4e2a\u975e\u5e38\u91cd\u8981\u7684\u8003\u8bd5\u9677\u9631\uff1a<\/p>\n\n\n\n<p><strong>SR \u7684\u4f18\u52bf\u4e3b\u8981\u4f53\u73b0\u5728\u201c\u51fa\u9519\u540e\u66f4\u7701\u91cd\u4f20\u201d\uff0c\u4e0d\u662f\u201c\u65e0\u5dee\u9519\u65f6\u4fe1\u9053\u5229\u7528\u7387\u4e00\u5b9a\u6bd4 GBN \u9ad8\u201d\u3002<\/strong><\/p>\n\n\n\n<p>\u5728\u540c\u6837\u7684\u5e8f\u53f7\u4f4d\u6570\u9650\u5236\u4e0b\uff0cGBN \u7684\u53d1\u9001\u7a97\u53e3\u4e0a\u9650\u5f80\u5f80\u6bd4 SR \u66f4\u5927\uff0c\u6240\u4ee5\u5728\u201c\u65e0\u5dee\u9519\u3001\u53ea\u770b\u6700\u5927\u6d41\u6c34\u7ebf\u80fd\u529b\u201d\u65f6\uff0cGBN \u7684\u6700\u5927\u53d1\u9001\u65b9\u5229\u7528\u7387\u53cd\u800c\u53ef\u80fd\u9ad8\u4e8e SR\u3002<\/p>\n\n\n\n<p>\u8fd9\u662f\u7279\u522b\u7231\u51fa\u9009\u62e9\u9898\u7684\u70b9\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u5e8f\u53f7\u4f4d\u6570\u548c\u7a97\u53e3\u5927\u5c0f\uff0c\u624d\u662f\u8fd9\u90e8\u5206\u6700\u6838\u5fc3\u7684\u786c\u7ea6\u675f<\/h2>\n\n\n\n<p>\u8fd9\u90e8\u5206\u6700\u5bb9\u6613\u8003\u516c\u5f0f\uff0c\u4e5f\u6700\u5bb9\u6613\u9519\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. \u505c\u6b62-\u7b49\u5f85\u534f\u8bae<\/h3>\n\n\n\n<p>\u53d1\u9001\u7a97\u53e3\u548c\u63a5\u6536\u7a97\u53e3\u90fd\u4e3a 1\u3002<br>\u901a\u5e38\u53ea\u9700\u8981 1 \u4f4d\u5e8f\u53f7\u5c31\u591f\u4e86\uff0c0 \u548c 1 \u4ea4\u66ff\u4f7f\u7528\u3002<\/p>\n\n\n\n<p>\u4e3a\u4ec0\u4e48\u8981\u7f16\u53f7\uff1f<br>\u56e0\u4e3a\u5982\u679c\u786e\u8ba4\u4e22\u5931\uff0c\u53d1\u9001\u65b9\u4f1a\u91cd\u53d1\u4e0a\u4e00\u5e27\uff1b\u63a5\u6536\u65b9\u5fc5\u987b\u80fd\u5206\u8fa8\u201c\u8fd9\u662f\u91cd\u4f20\u7684\u65e7\u5e27\u201d\u8fd8\u662f\u201c\u65b0\u5e27\u201d\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2. GBN \u534f\u8bae<\/h3>\n\n\n\n<p>\u8bbe\u5e27\u5e8f\u53f7\u5b57\u6bb5\u4e3a n \u4f4d\uff0c\u5219\u5e8f\u53f7\u7a7a\u95f4\u5927\u5c0f\u4e3a <code>2^n<\/code>\u3002<\/p>\n\n\n\n<p>GBN \u4e2d\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u63a5\u6536\u7a97\u53e3 <code>W_R = 1<\/code><\/li>\n\n\n\n<li>\u53d1\u9001\u7a97\u53e3\u5fc5\u987b\u6ee1\u8db3 <code>W_T &lt;= 2^n - 1<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u8fd9\u4e2a\u5f0f\u5b50\u5fc5\u987b\u4f1a\u80cc\uff0c\u4e5f\u5fc5\u987b\u7406\u89e3\u3002<\/p>\n\n\n\n<p>\u4e3a\u4ec0\u4e48\u4e0d\u662f <code>2^n<\/code>\uff1f<br>\u56e0\u4e3a\u5fc5\u987b\u81f3\u5c11\u7559\u51fa 1 \u4e2a\u7f16\u53f7\u7a7a\u4f4d\uff0c\u5426\u5219\u4e00\u65e6\u5e8f\u53f7\u56de\u7ed5\uff0c\u63a5\u6536\u65b9\u5c31\u53ef\u80fd\u5206\u4e0d\u6e05\u67d0\u4e2a\u5230\u6765\u7684\u5e27\u5230\u5e95\u662f\u201c\u65b0\u4e00\u8f6e\u7684\u5e27\u201d\u8fd8\u662f\u201c\u8001\u5e27\u7684\u91cd\u4f20\u201d\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5 GBN \u7684\u8bb0\u5fc6\u6cd5\u5f88\u7b80\u5355\uff1a<\/p>\n\n\n\n<p><code>W_R = 1<\/code>\uff0c<code>W_T<\/code> \u6700\u5927\u53ea\u80fd\u5230 <code>2^n - 1<\/code><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3. SR \u534f\u8bae<\/h3>\n\n\n\n<p>SR \u7684\u9650\u5236\u66f4\u4e25\u683c\u3002<\/p>\n\n\n\n<p>\u4e00\u822c\u6761\u4ef6\u662f\uff1a<\/p>\n\n\n\n<p><code>W_T + W_R &lt;= 2^n<\/code><\/p>\n\n\n\n<p>\u5982\u679c\u9898\u76ee\u9ed8\u8ba4\u53d1\u9001\u7a97\u53e3\u548c\u63a5\u6536\u7a97\u53e3\u76f8\u7b49\uff0c\u4e5f\u5c31\u662f <code>W_T = W_R<\/code>\uff0c\u90a3\u4e48\u5c31\u5f97\u5230\uff1a<\/p>\n\n\n\n<p><code>W_T &lt;= 2^(n-1)<\/code>\uff0c<code>W_R &lt;= 2^(n-1)<\/code><\/p>\n\n\n\n<p>\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u5927\u5bb6\u5e38\u80cc\uff1a<\/p>\n\n\n\n<p>SR \u4e2d\u53d1\u9001\u7a97\u53e3\u3001\u63a5\u6536\u7a97\u53e3\u6700\u5927\u90fd\u4e0d\u80fd\u8d85\u8fc7\u5e8f\u53f7\u7a7a\u95f4\u7684\u4e00\u534a\u3002<\/p>\n\n\n\n<p>\u539f\u56e0\u4e5f\u4e00\u6837\uff0c\u90fd\u662f\u4e3a\u4e86\u9632\u6b62\u5e8f\u53f7\u56de\u7ed5\u540e\uff0c\u65b0\u65e7\u5e27\u6df7\u6dc6\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4fe1\u9053\u5229\u7528\u7387\u600e\u4e48\u7edf\u4e00\u770b<\/h2>\n\n\n\n<p>\u8fd9\u4e00\u90e8\u5206\u5efa\u8bae\u76f4\u63a5\u7edf\u4e00\u6210\u4e00\u4e2a\u6a21\u578b\uff0c\u4e0d\u8981\u4e09\u5957\u4e09\u5957\u80cc\u3002<\/p>\n\n\n\n<p>\u8bbe\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6570\u636e\u5e27\u53d1\u9001\u65f6\u5ef6\u4e3a <code>T_d<\/code><\/li>\n\n\n\n<li>\u786e\u8ba4\u5e27\u53d1\u9001\u65f6\u5ef6\u4e3a <code>T_ack<\/code><\/li>\n\n\n\n<li>\u5355\u5411\u4f20\u64ad\u65f6\u5ef6\u4e3a <code>T_p<\/code><\/li>\n\n\n\n<li>\u53d1\u9001\u7a97\u53e3\u5927\u5c0f\u4e3a <code>W<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u90a3\u4e48\uff1a<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u505c\u6b62-\u7b49\u5f85\u534f\u8bae<\/h3>\n\n\n\n<p><code>U = T_d \/ (T_d + 2T_p + T_ack)<\/code><\/p>\n\n\n\n<p>\u5982\u679c\u786e\u8ba4\u5e27\u5f88\u77ed\uff0c\u53ef\u4ee5\u5ffd\u7565\u4e0d\u8ba1\uff0c\u90a3\u4e48\uff1a<\/p>\n\n\n\n<p><code>U = T_d \/ (T_d + 2T_p)<\/code><\/p>\n\n\n\n<p>\u5982\u679c\u518d\u8bbe <code>a = T_p \/ T_d<\/code>\uff0c\u5219\uff1a<\/p>\n\n\n\n<p><code>U = 1 \/ (1 + 2a)<\/code><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u6ed1\u52a8\u7a97\u53e3\u534f\u8bae\uff08GBN\u3001SR\uff09\u5728\u65e0\u5dee\u9519\u65f6<\/h3>\n\n\n\n<p><code>U = min { 1, W \u00d7 T_d \/ (T_d + 2T_p + T_ack) }<\/code><\/p>\n\n\n\n<p>\u5982\u679c\u786e\u8ba4\u5e27\u53d1\u9001\u65f6\u5ef6\u5ffd\u7565\u4e0d\u8ba1\uff0c\u5219\u53d8\u6210\uff1a<\/p>\n\n\n\n<p><code>U = min { 1, W \/ (1 + 2a) }<\/code><\/p>\n\n\n\n<p>\u8fd9\u4e2a\u5f0f\u5b50\u975e\u5e38\u91cd\u8981\uff0c\u56e0\u4e3a\u5b83\u8bf4\u660e\u4e86\u4e00\u4e2a\u672c\u8d28\uff1a<\/p>\n\n\n\n<p><strong>\u5728\u65e0\u5dee\u9519\u60c5\u51b5\u4e0b\uff0cGBN \u548c SR \u7684\u5229\u7528\u7387\u8868\u8fbe\u5f0f\u5f62\u5f0f\u662f\u4e00\u6837\u7684\u3002<\/strong><br>\u5dee\u522b\u4e0d\u5728\u516c\u5f0f\u5f62\u5f0f\uff0c\u800c\u5728\u4e8e\u4e24\u8005\u5141\u8bb8\u7684\u6700\u5927\u7a97\u53e3\u4e0d\u540c\u3001\u51fa\u9519\u540e\u7684\u91cd\u4f20\u4ee3\u4ef7\u4e0d\u540c\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u54ea\u4e9b\u534f\u8bae\u7406\u8bba\u4e0a\u53ef\u4ee5\u8fbe\u5230 100% \u5229\u7528\u7387<\/h2>\n\n\n\n<p>\u6807\u51c6\u8003\u6cd5\u4e0b\uff0c\u7b54\u6848\u662f\uff1a<\/p>\n\n\n\n<p><strong>\u6ed1\u52a8\u7a97\u53e3\u534f\u8bae\u53ef\u4ee5\u7406\u8bba\u4e0a\u8fbe\u5230 100%\uff0c\u4e5f\u5c31\u662f GBN \u548c SR \u53ef\u4ee5\u3002<\/strong><\/p>\n\n\n\n<p>\u505c\u6b62-\u7b49\u5f85\u901a\u5e38\u505a\u4e0d\u5230\uff0c\u56e0\u4e3a\u5b83\u6bcf\u53d1\u4e00\u5e27\u5c31\u8981\u7b49\u786e\u8ba4\u3002<\/p>\n\n\n\n<p>\u66f4\u51c6\u786e\u4e00\u70b9\u8bf4\uff0c\u53ea\u8981\u7a97\u53e3\u8db3\u591f\u5927\uff0c\u6ee1\u8db3\uff1a<\/p>\n\n\n\n<p><code>W \u00d7 T_d &gt;= T_d + 2T_p + T_ack<\/code><\/p>\n\n\n\n<p>\u53d1\u9001\u65b9\u5c31\u53ef\u4ee5\u4e00\u76f4\u8fde\u7eed\u53d1\u9001\uff0c\u4e0d\u5fc5\u505c\u4e0b\u6765\u7b49\uff0c\u5229\u7528\u7387\u5c31\u80fd\u8fbe\u5230 100%\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e0b\u9762\u628a\u4f60\u5217\u7684\u9898\u9010\u9898\u5403\u900f<\/h2>\n\n\n\n<p>\u4f60\u7ed9\u7684\u9898\u91cc\u6709\u51e0\u5904\u662f\u8bed\u97f3\u8f6c\u5199\u540e\u6709\u70b9\u6a21\u7cca\uff0c\u6211\u6309 408 \u91cc\u6700\u5e38\u89c1\u7684\u539f\u9898\u8bed\u5883\u6765\u7406\u89e3\u5e76\u4f5c\u7b54\u3002\u5bf9\u660e\u663e\u6709\u5355\u4f4d\u7591\u70b9\u7684\u9898\uff0c\u6211\u4f1a\u987a\u4fbf\u6307\u51fa\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f8b\u9898 1\uff1a\u505c\u6b62-\u7b49\u5f85\u534f\u8bae\u4e0b\uff0c\u6700\u5927\u5229\u7528\u7387 80%\uff0c\u6570\u636e\u5e27\u957f\u5ea6\u81f3\u5c11\u591a\u5c11<\/h2>\n\n\n\n<p>\u9898\u610f\u7406\u89e3\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6570\u636e\u4f20\u8f93\u901f\u7387\uff1a4 KB\/s<\/li>\n\n\n\n<li>\u5355\u5411\u4f20\u64ad\u65f6\u5ef6\uff1a30 ms<\/li>\n\n\n\n<li>\u505c\u6b62-\u7b49\u5f85\u534f\u8bae<\/li>\n\n\n\n<li>\u6700\u5927\u4fe1\u9053\u5229\u7528\u7387 80%<\/li>\n\n\n\n<li>\u6c42\u6570\u636e\u5e27\u957f\u81f3\u5c11\u591a\u5c11<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u89e3\u9898\u601d\u8def<\/h3>\n\n\n\n<p>\u505c\u6b62-\u7b49\u5f85\u534f\u8bae\uff0c\u901a\u5e38\u5ffd\u7565\u786e\u8ba4\u5e27\u53d1\u9001\u65f6\u5ef6\u65f6\uff1a<\/p>\n\n\n\n<p><code>U = T_d \/ (T_d + 2T_p)<\/code><\/p>\n\n\n\n<p>\u4ee3\u5165\uff1a<\/p>\n\n\n\n<p><code>0.8 = T_d \/ (T_d + 60 ms)<\/code><\/p>\n\n\n\n<p>\u89e3\u5f97\uff1a<\/p>\n\n\n\n<p><code>0.8T_d + 48 = T_d<\/code><\/p>\n\n\n\n<p><code>0.2T_d = 48<\/code><\/p>\n\n\n\n<p><code>T_d = 240 ms<\/code><\/p>\n\n\n\n<p>\u518d\u7531<\/p>\n\n\n\n<p><code>\u5e27\u957f = \u901f\u7387 \u00d7 \u53d1\u9001\u65f6\u5ef6<\/code><\/p>\n\n\n\n<p>\u5f97\u5230\uff1a<\/p>\n\n\n\n<p><code>L = 4 KB\/s \u00d7 0.24 s = 0.96 KB<\/code><\/p>\n\n\n\n<p>\u6240\u4ee5\u6700\u5c11\u9700\u8981\uff1a<\/p>\n\n\n\n<p><strong>960 B<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u672c\u9898\u7ed3\u8bba<\/h3>\n\n\n\n<p>\u6570\u636e\u5e27\u957f\u5ea6\u81f3\u5c11\u4e3a <strong>960 B<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u6613\u9519\u70b9<\/h3>\n\n\n\n<p>\u6700\u5bb9\u6613\u9519\u5728\u4e24\u5904\uff1a<\/p>\n\n\n\n<p>\u7b2c\u4e00\uff0c\u4f20\u64ad\u65f6\u5ef6\u662f\u5355\u5411 30 ms\uff0c\u6240\u4ee5\u5f80\u8fd4\u8981\u4e58 2\u3002<br>\u7b2c\u4e8c\uff0c\u505c\u6b62-\u7b49\u5f85\u91cc\u6c42\u5229\u7528\u7387\uff0c\u6838\u5fc3\u4e0d\u662f\u201c\u53d1\u5f97\u591a\u5feb\u201d\uff0c\u800c\u662f\u201c\u53d1\u4e00\u5e27\u4e4b\u540e\u7b49\u591a\u4e45\u201d\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f8b\u9898 2\uff1aGBN \u5df2\u53d1 0 \u5230 6\uff0c\u8d85\u65f6\u540e\u53ea\u6536\u5230\u5bf9 1\u30012\u30014 \u53f7\u5e27\u7684\u786e\u8ba4\uff0c\u8981\u91cd\u4f20\u591a\u5c11\u5e27<\/h2>\n\n\n\n<p>\u8fd9\u9053\u9898\u7684\u5173\u952e\u5728\u4e8e\uff1a<strong>GBN \u91c7\u7528\u7d2f\u8ba1\u786e\u8ba4\u3002<\/strong><\/p>\n\n\n\n<p>\u5982\u679c\u5df2\u7ecf\u6536\u5230\u4e86\u5bf9 4 \u53f7\u5e27\u7684\u786e\u8ba4\uff0c\u90a3\u4e48\u901a\u5e38\u8868\u793a 0 \u5230 4 \u53f7\u5e27\u90fd\u5df2\u88ab\u786e\u8ba4\u3002<br>\u56e0\u6b64\u5f53\u524d\u672a\u786e\u8ba4\u7684\u5c31\u662f 5\u30016 \u4e24\u5e27\u3002<\/p>\n\n\n\n<p>\u4e00\u65e6\u8d85\u65f6\uff0cGBN \u8981\u4ece\u6700\u65e9\u672a\u786e\u8ba4\u5e27\u5f00\u59cb\uff0c\u628a\u540e\u9762\u5df2\u53d1\u672a\u786e\u8ba4\u7684\u5e27\u5168\u90e8\u91cd\u4f20\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\u8981\u91cd\u4f20\uff1a<\/p>\n\n\n\n<p><strong>5\u30016 \u4e24\u5e27\uff0c\u5171 2 \u5e27<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u672c\u9898\u7ed3\u8bba<\/h3>\n\n\n\n<p><strong>\u9700\u8981\u91cd\u4f20 2 \u5e27<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u6613\u9519\u70b9<\/h3>\n\n\n\n<p>\u5f88\u591a\u4eba\u4f1a\u628a\u201c\u6536\u5230 1\u30012\u30014 \u7684\u786e\u8ba4\u201d\u7406\u89e3\u6210\u53ea\u6709 1\u30012\u30014 \u88ab\u5206\u522b\u786e\u8ba4\u3002<br>\u4f46 GBN \u4e0d\u662f SR\uff0cGBN \u7684\u6838\u5fc3\u662f\u7d2f\u8ba1\u786e\u8ba4\uff0c\u770b\u5230\u8f83\u5927\u7684\u786e\u8ba4\u53f7\u65f6\uff0c\u8981\u60f3\u5230\u5b83\u628a\u524d\u9762\u6309\u5e8f\u7684\u4e00\u4e32\u90fd\u786e\u8ba4\u6389\u4e86\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f8b\u9898 3\uff1aGBN \u4e2d\u53d1\u9001\u7a97\u53e3\u4e3a 32\uff0c\u81f3\u5c11\u9700\u8981\u591a\u5c11\u4f4d\u5e8f\u5217\u53f7<\/h2>\n\n\n\n<p>GBN \u7684\u7ea6\u675f\u662f\uff1a<\/p>\n\n\n\n<p><code>W_T &lt;= 2^n - 1<\/code><\/p>\n\n\n\n<p>\u5df2\u77e5 <code>W_T = 32<\/code>\uff0c\u6c42\u6700\u5c0f n\u3002<\/p>\n\n\n\n<p>\u6709\uff1a<\/p>\n\n\n\n<p><code>2^n - 1 &gt;= 32<\/code><\/p>\n\n\n\n<p>\u5373\uff1a<\/p>\n\n\n\n<p><code>2^n &gt;= 33<\/code><\/p>\n\n\n\n<p>\u6240\u4ee5\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>2^5 = 32<\/code> \u4e0d\u591f<\/li>\n\n\n\n<li><code>2^6 = 64<\/code> \u53ef\u4ee5<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u672c\u9898\u7ed3\u8bba<\/h3>\n\n\n\n<p><strong>\u81f3\u5c11\u9700\u8981 6 \u4f4d\u5e8f\u5217\u53f7<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f8b\u9898 4\uff1aGBN \u534f\u8bae\u4e2d\uff0c\u5e27\u7f16\u53f7\u5b57\u6bb5\u4e3a 7 \u4f4d\uff0c\u53d1\u9001\u7a97\u53e3\u6700\u5927\u957f\u5ea6\u662f\u591a\u5c11<\/h2>\n\n\n\n<p>GBN \u6700\u5927\u53d1\u9001\u7a97\u53e3\uff1a<\/p>\n\n\n\n<p><code>W_T(max) = 2^n - 1<\/code><\/p>\n\n\n\n<p>\u4ee3\u5165 <code>n = 7<\/code>\uff1a<\/p>\n\n\n\n<p><code>W_T(max) = 2^7 - 1 = 127<\/code><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u672c\u9898\u7ed3\u8bba<\/h3>\n\n\n\n<p><strong>\u6700\u5927\u53d1\u9001\u7a97\u53e3\u4e3a 127<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f8b\u9898 5\uff1aSR \u534f\u8bae\u4e2d\uff0c\u82e5\u91c7\u7528 5 \u4f4d\u5e27\u5e8f\u53f7\uff0c\u6700\u5927\u63a5\u6536\u7a97\u53e3\u662f\u591a\u5c11<\/h2>\n\n\n\n<p>SR \u7684\u5e38\u89c1\u7ed3\u8bba\u662f\uff1a<\/p>\n\n\n\n<p><code>W_R(max) = 2^(n-1)<\/code><\/p>\n\n\n\n<p>\u4ee3\u5165 <code>n = 5<\/code>\uff1a<\/p>\n\n\n\n<p><code>W_R(max) = 2^4 = 16<\/code><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u672c\u9898\u7ed3\u8bba<\/h3>\n\n\n\n<p><strong>\u6700\u5927\u63a5\u6536\u7a97\u53e3\u4e3a 16<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f8b\u9898 6\uff1a\u7a97\u53e3\u5927\u5c0f\u4e3a n \u7684\u6ed1\u52a8\u7a97\u53e3\uff0c\u6700\u591a\u53ef\u4ee5\u6709\u591a\u5c11\u5e27\u5df2\u53d1\u9001\u4f46\u672a\u786e\u8ba4<\/h2>\n\n\n\n<p>\u8fd9\u4e2a\u9898\u672c\u8d28\u4e0a\u662f\u5728\u95ee\u53d1\u9001\u7a97\u53e3\u7684\u5b9a\u4e49\u3002<\/p>\n\n\n\n<p>\u53d1\u9001\u7a97\u53e3\u5927\u5c0f\u662f\u591a\u5c11\uff0c\u5c31\u6700\u591a\u5141\u8bb8\u591a\u5c11\u5e27\u5904\u4e8e\u201c\u5df2\u53d1\u9001\u4f46\u8fd8\u6ca1\u6536\u5230\u786e\u8ba4\u201d\u7684\u72b6\u6001\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u672c\u9898\u7ed3\u8bba<\/h3>\n\n\n\n<p><strong>\u6700\u591a\u6709 n \u5e27\u5df2\u53d1\u9001\u4f46\u672a\u786e\u8ba4<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u6613\u9519\u70b9<\/h3>\n\n\n\n<p>\u4e0d\u8981\u628a\u201c\u7a97\u53e3\u91cc\u53ef\u53d1\u9001\u7684\u5e27\u201d\u548c\u201c\u5e8f\u53f7\u603b\u7a7a\u95f4\u201d\u6df7\u5728\u4e00\u8d77\u3002<br>\u8fd9\u4e2a\u9898\u95ee\u7684\u662f\u53d1\u9001\u65b9\u6d41\u6c34\u7ebf\u91cc\u6700\u591a\u80fd\u538b\u591a\u5c11\u4e2a\u672a\u786e\u8ba4\u5e27\uff0c\u7b54\u6848\u5c31\u662f\u53d1\u9001\u7a97\u53e3\u5927\u5c0f\u672c\u8eab\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f8b\u9898 7\uff1aSR \u534f\u8bae\u4e2d\uff0c4 \u6bd4\u7279\u7f16\u53f7\uff0c\u63a5\u6536\u7a97\u53e3\u4e3a 7\uff0c\u53d1\u9001\u7a97\u53e3\u6700\u5927\u662f\u591a\u5c11<\/h2>\n\n\n\n<p>SR \u7684\u4e00\u822c\u7ea6\u675f\u6761\u4ef6\u662f\uff1a<\/p>\n\n\n\n<p><code>W_T + W_R &lt;= 2^n<\/code><\/p>\n\n\n\n<p>\u9898\u4e2d\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>n = 4<\/code>\uff0c\u6240\u4ee5\u5e8f\u53f7\u7a7a\u95f4\u4e3a <code>16<\/code><\/li>\n\n\n\n<li><code>W_R = 7<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u6240\u4ee5\uff1a<\/p>\n\n\n\n<p><code>W_T &lt;= 16 - 7 = 9<\/code><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u672c\u9898\u7ed3\u8bba<\/h3>\n\n\n\n<p><strong>\u53d1\u9001\u7a97\u53e3\u6700\u5927\u4e3a 9<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u8865\u5145\u8bf4\u660e<\/h3>\n\n\n\n<p>\u5982\u679c\u9898\u76ee\u989d\u5916\u8bf4\u660e\u201c\u53d1\u9001\u7a97\u53e3\u548c\u63a5\u6536\u7a97\u53e3\u76f8\u7b49\u201d\uff0c\u90a3\u5c31\u4e0d\u80fd\u8fd9\u4e48\u7b97\u4e86\uff0c\u90a3\u65f6\u5e94\u53d6\u4e8c\u8005\u90fd\u4e0d\u8d85\u8fc7 8\uff0c\u5e76\u4e14\u82e5\u5df2\u77e5 <code>W_R = 7<\/code>\uff0c\u5219 <code>W_T = 7<\/code>\u3002<\/p>\n\n\n\n<p>\u4f46\u6309\u4f60\u7ed9\u51fa\u7684\u8868\u8ff0\uff0c\u6700\u6807\u51c6\u7684\u89e3\u6cd5\u5c31\u662f\uff1a<\/p>\n\n\n\n<p><strong><code>W_T + W_R &lt;= 2^n<\/code>\uff0c\u6240\u4ee5\u6700\u5927\u53d1\u9001\u7a97\u53e3\u662f 9<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f8b\u9898 8\uff1a3 \u6bd4\u7279\u7f16\u53f7\uff0c\u5229\u7528\u7387\u5927\u4e8e 80%\uff0cAB \u4e4b\u95f4\u91c7\u7528\u4ec0\u4e48\u534f\u8bae<\/h2>\n\n\n\n<p>\u4f60\u8fd9\u9053\u9898\u7684\u53e3\u8ff0\u91cc\u6709\u660e\u663e\u7684\u8f6c\u5199\/\u5355\u4f4d\u7591\u70b9\uff0c\u6211\u5148\u6309\u4f60\u7ed9\u51fa\u7684\u6570\u503c\u76f4\u63a5\u9a8c\u7b97\u4e00\u4e0b\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u901f\u7387\uff1a20 KB\/s<\/li>\n\n\n\n<li>\u6570\u636e\u5e27\u548c\u786e\u8ba4\u5e27\u90fd\u4e3a 2000 B<\/li>\n\n\n\n<li>\u5f80\u8fd4\u4f20\u64ad\u65f6\u5ef6 1400 ms<\/li>\n\n\n\n<li>3 \u6bd4\u7279\u7f16\u53f7<\/li>\n<\/ul>\n\n\n\n<p>\u5219\uff1a<\/p>\n\n\n\n<p><code>T_d = 2000 \/ 20000 = 0.1 s = 100 ms<\/code><\/p>\n\n\n\n<p><code>T_ack = 100 ms<\/code><\/p>\n\n\n\n<p>\u7b49\u5f85\u4e00\u4e2a\u786e\u8ba4\u56de\u6765\u9700\u8981\uff1a<\/p>\n\n\n\n<p><code>T_d + RTT\u4f20\u64ad + T_ack = 100 + 1400 + 100 = 1600 ms<\/code><\/p>\n\n\n\n<p>\u82e5\u8981\u5229\u7528\u7387\u5927\u4e8e 80%\uff0c\u9700\u8981\uff1a<\/p>\n\n\n\n<p><code>W \u00d7 100 \/ 1600 &gt; 0.8<\/code><\/p>\n\n\n\n<p>\u5f97\u5230\uff1a<\/p>\n\n\n\n<p><code>W &gt; 12.8<\/code><\/p>\n\n\n\n<p>\u4e5f\u5c31\u662f\u81f3\u5c11\u8981 <code>W = 13<\/code><\/p>\n\n\n\n<p>\u4f46 3 \u6bd4\u7279\u7f16\u53f7\u4e0b\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>GBN \u6700\u5927\u7a97\u53e3 <code>7<\/code><\/li>\n\n\n\n<li>SR \u82e5\u53d1\u6536\u7a97\u53e3\u76f8\u7b49\uff0c\u6700\u5927\u53ea\u80fd <code>4<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u6240\u4ee5\u6309\u4f60\u73b0\u5728\u7ed9\u51fa\u7684\u6570\u503c\uff0c<strong>\u6ca1\u6709\u4efb\u4f55\u6807\u51c6\u534f\u8bae\u80fd\u505a\u5230\u5927\u4e8e 80%<\/strong>\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u672c\u9898\u7ed3\u8bba<\/h3>\n\n\n\n<p><strong>\u6309\u4f60\u5f53\u524d\u7ed9\u51fa\u7684\u6570\u636e\uff0c\u8fd9\u9053\u9898\u65e0\u89e3\uff0c\u8bf4\u660e\u539f\u9898\u5927\u6982\u7387\u6709\u5355\u4f4d\u6216\u6570\u5b57\u8f6c\u5199\u9519\u8bef\u3002<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u8fd9\u9898\u771f\u6b63\u7684\u4ef7\u503c<\/h3>\n\n\n\n<p>\u8fd9\u7c7b\u9898\u4e0d\u8981\u6025\u7740\u731c\u534f\u8bae\uff0c\u800c\u8981\u5148\u7b97\u201c\u8fbe\u5230\u76ee\u6807\u5229\u7528\u7387\u81f3\u5c11\u9700\u8981\u591a\u5927\u7a97\u53e3\u201d\uff0c\u518d\u770b\u5e8f\u53f7\u4f4d\u6570\u662f\u5426\u5141\u8bb8\u3002<br>\u8fd9\u4e00\u6b65\u4e00\u65e6\u4e0d\u6ee1\u8db3\uff0c\u5c31\u5e94\u8be5\u7acb\u523b\u610f\u8bc6\u5230\u9898\u76ee\u6570\u636e\u6709\u95ee\u9898\uff0c\u800c\u4e0d\u662f\u5f3a\u884c\u9009 GBN \u6216 SR\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f8b\u9898 9\uff1a\u7406\u8bba\u4e0a\u53ef\u4ee5\u8fbe\u5230 100% \u901a\u4fe1\u5229\u7528\u7387\u7684\u662f\u54ea\u4e9b\u534f\u8bae<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u672c\u9898\u7ed3\u8bba<\/h3>\n\n\n\n<p><strong>\u6ed1\u52a8\u7a97\u53e3\u534f\u8bae\u53ef\u4ee5\u7406\u8bba\u4e0a\u8fbe\u5230 100%\uff0c\u5373 GBN \u548c SR\u3002<\/strong><\/p>\n\n\n\n<p>\u505c\u6b62-\u7b49\u5f85\u4e00\u822c\u4e0d\u884c\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u6613\u9519\u70b9<\/h3>\n\n\n\n<p>\u4e0d\u8981\u673a\u68b0\u5730\u8ba4\u4e3a\u201cSR \u4e00\u5b9a\u6bd4 GBN \u5229\u7528\u7387\u9ad8\u201d\u3002<br>\u5728\u65e0\u5dee\u9519\u60c5\u51b5\u4e0b\uff0c\u4e24\u8005\u7684\u516c\u5f0f\u5f62\u5f0f\u4e00\u6837\uff0c\u53ea\u662f\u5141\u8bb8\u7684\u7a97\u53e3\u4e0a\u9650\u4e0d\u540c\u3002<br>SR \u7684\u771f\u6b63\u4f18\u52bf\u662f\u51fa\u9519\u540e\u53ea\u91cd\u4f20\u5c11\u91cf\u5e27\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f8b\u9898 10\uff1aGBN \u4e2d\uff0c\u901f\u7387 16 KB\/s\uff0c\u5355\u5411\u4f20\u64ad 270 ms\uff0c\u5e27\u957f 128\uff5e512 B\uff0c\u786e\u8ba4\u5e27\u4e0e\u6570\u636e\u5e27\u7b49\u957f\uff0c\u6700\u9ad8\u5229\u7528\u7387\u4e0b\u81f3\u5c11\u9700\u8981\u51e0\u4f4d\u5e8f\u53f7<\/h2>\n\n\n\n<p>\u9898\u76ee\u8bf4\u201c\u4e3a\u4f7f\u4fe1\u9053\u5229\u7528\u7387\u8fbe\u5230\u6700\u9ad8\u201d\uff0c\u90a3\u663e\u7136\u5e94\u8be5\u53d6<strong>\u6700\u5927\u5e27\u957f 512 B<\/strong>\uff0c\u56e0\u4e3a\u5e27\u8d8a\u957f\uff0c\u53d1\u9001\u65f6\u5ef6\u8d8a\u5927\uff0c\u8d8a\u5bb9\u6613\u586b\u6ee1\u4f20\u64ad\u7b49\u5f85\u65f6\u95f4\u3002<\/p>\n\n\n\n<p>\u53d6 <code>L = 512 B<\/code><\/p>\n\n\n\n<p>\u82e5\u6309\u5e38\u89c4\u8003\u8bd5\u8fd1\u4f3c\uff1a<\/p>\n\n\n\n<p><code>T_d = 512 \/ 16000 = 0.032 s = 32 ms<\/code><\/p>\n\n\n\n<p>\u786e\u8ba4\u5e27\u7b49\u957f\uff0c\u6240\u4ee5\uff1a<\/p>\n\n\n\n<p><code>T_ack = 32 ms<\/code><\/p>\n\n\n\n<p>\u5355\u5411\u4f20\u64ad 270 ms\uff0c\u6240\u4ee5\u5f80\u8fd4\u4f20\u64ad\uff1a<\/p>\n\n\n\n<p><code>2T_p = 540 ms<\/code><\/p>\n\n\n\n<p>\u8981\u8fbe\u5230\u6700\u9ad8\u5229\u7528\u7387\uff0c\u4e5f\u5c31\u662f\u8fbe\u5230 100%\uff0c\u9700\u8981\u6ee1\u8db3\uff1a<\/p>\n\n\n\n<p><code>W \u00d7 T_d &gt;= T_d + 2T_p + T_ack<\/code><\/p>\n\n\n\n<p>\u5373\uff1a<\/p>\n\n\n\n<p><code>W \u00d7 32 &gt;= 32 + 540 + 32 = 604<\/code><\/p>\n\n\n\n<p>\u6240\u4ee5\uff1a<\/p>\n\n\n\n<p><code>W &gt;= 18.875<\/code><\/p>\n\n\n\n<p>\u6545\u81f3\u5c11\u9700\u8981\uff1a<\/p>\n\n\n\n<p><strong><code>W = 19<\/code><\/strong><\/p>\n\n\n\n<p>GBN \u4e2d\u8981\u6c42\uff1a<\/p>\n\n\n\n<p><code>W_T &lt;= 2^n - 1<\/code><\/p>\n\n\n\n<p>\u6240\u4ee5\uff1a<\/p>\n\n\n\n<p><code>2^n - 1 &gt;= 19<\/code><\/p>\n\n\n\n<p>\u6709\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>2^4 - 1 = 15<\/code> \u4e0d\u591f<\/li>\n\n\n\n<li><code>2^5 - 1 = 31<\/code> \u53ef\u4ee5<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u672c\u9898\u7ed3\u8bba<\/h3>\n\n\n\n<p><strong>\u81f3\u5c11\u9700\u8981 5 \u4f4d\u5e8f\u53f7<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u6613\u9519\u70b9<\/h3>\n\n\n\n<p>\u8fd9\u9053\u9898\u7279\u522b\u5bb9\u6613\u9519\u5728\u201c\u5e27\u957f\u8303\u56f4 128\uff5e512 B \u8be5\u53d6\u54ea\u4e2a\u201d\u3002<br>\u65e2\u7136\u9898\u76ee\u8bf4\u201c\u4f7f\u5229\u7528\u7387\u8fbe\u5230\u6700\u9ad8\u201d\uff0c\u5c31\u4e00\u5b9a\u53d6\u6700\u5927\u5e27\u957f 512 B\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f8b\u9898 11\uff1a3 \u6bd4\u7279\u7f16\u53f7\uff0c\u53d1\u9001\u7a97\u53e3\u5927\u5c0f\u4e3a 5\uff0c\u63a5\u6536\u7a97\u53e3\u6700\u5927\u662f\u591a\u5c11<\/h2>\n\n\n\n<p>\u8fd9\u9898\u672c\u8d28\u8fd8\u662f\u7528\uff1a<\/p>\n\n\n\n<p><code>W_T + W_R &lt;= 2^n<\/code><\/p>\n\n\n\n<p>\u5df2\u77e5\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>n = 3<\/code>\uff0c\u6240\u4ee5\u5e8f\u53f7\u7a7a\u95f4\u4e3a <code>8<\/code><\/li>\n\n\n\n<li><code>W_T = 5<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u6240\u4ee5\uff1a<\/p>\n\n\n\n<p><code>W_R &lt;= 8 - 5 = 3<\/code><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u672c\u9898\u7ed3\u8bba<\/h3>\n\n\n\n<p><strong>\u63a5\u6536\u7a97\u53e3\u6700\u5927\u4e3a 3<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f8b\u9898 12\uff1a3 \u6bd4\u7279\u7f16\u53f7\u4e0b\uff0c\u505c\u6b62-\u7b49\u5f85\u3001GBN\u3001SR \u7684\u6700\u5927\u4fe1\u9053\u5229\u7528\u7387\u5173\u7cfb<\/h2>\n\n\n\n<p>\u8bbe\u4e09\u8005\u6700\u5927\u4fe1\u9053\u5229\u7528\u7387\u5206\u522b\u4e3a <code>U_SW<\/code>\u3001<code>U_GBN<\/code>\u3001<code>U_SR<\/code>\u3002<\/p>\n\n\n\n<p>\u5f53\u5e27\u5e8f\u53f7\u4f4d\u6570\u4e3a 3 \u65f6\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u505c\u6b62-\u7b49\u5f85\uff1a\u53d1\u9001\u7a97\u53e3 <code>1<\/code><\/li>\n\n\n\n<li>GBN\uff1a\u53d1\u9001\u7a97\u53e3\u6700\u5927 <code>7<\/code><\/li>\n\n\n\n<li>SR\uff1a\u82e5\u53d1\u9001\u7a97\u53e3\u548c\u63a5\u6536\u7a97\u53e3\u76f8\u7b49\uff0c\u5219\u53d1\u9001\u7a97\u53e3\u6700\u5927 <code>4<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u5728\u65e0\u5dee\u9519\u3001\u5ffd\u7565\u786e\u8ba4\u5e27\u957f\u65f6\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>U_SW = min{1, 1 \/ (1 + 2a)}<\/code><\/li>\n\n\n\n<li><code>U_GBN = min{1, 7 \/ (1 + 2a)}<\/code><\/li>\n\n\n\n<li><code>U_SR = min{1, 4 \/ (1 + 2a)}<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u56e0\u6b64\u4e00\u822c\u5173\u7cfb\u4e3a\uff1a<\/p>\n\n\n\n<p><strong><code>U_GBN &gt;= U_SR &gt;= U_SW<\/code><\/strong><\/p>\n\n\n\n<p>\u5982\u679c\u4f20\u64ad\u65f6\u5ef6\u8db3\u591f\u5927\uff0c\u901a\u5e38\u4f1a\u4e25\u683c\u8868\u73b0\u4e3a\uff1a<\/p>\n\n\n\n<p><strong><code>U_GBN &gt; U_SR &gt; U_SW<\/code><\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u672c\u9898\u7ed3\u8bba<\/h3>\n\n\n\n<p><strong>\u4e00\u822c\u5e94\u9009 <code>U_GBN &gt;= U_SR &gt;= U_SW<\/code><\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u6613\u9519\u70b9<\/h3>\n\n\n\n<p>\u5f88\u591a\u4eba\u51ed\u76f4\u89c9\u4f1a\u9009\u201cSR \u6700\u5927\u201d\u3002<br>\u8fd9\u662f\u9519\u8bef\u7684\u3002<br>SR \u7684\u5f3a\u9879\u662f\u51fa\u9519\u65f6\u4ee3\u4ef7\u5c0f\uff0c\u4e0d\u662f\u56fa\u5b9a\u5e8f\u53f7\u4f4d\u6570\u4e0b\u6700\u5927\u6d41\u6c34\u7ebf\u4e00\u5b9a\u6700\u957f\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f8b\u9898 13\uff1a50 kb\/s\uff0c\u5e27\u957f 1 kbit\uff0c\u634e\u5e26\u786e\u8ba4\uff0c3 bit \u5e8f\u53f7\uff0c\u5355\u5411\u4f20\u64ad 270 ms\uff0c\u6c42\u4e09\u79cd\u534f\u8bae\u7684\u6700\u5927\u5229\u7528\u7387<\/h2>\n\n\n\n<p>\u5df2\u77e5\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f20\u8f93\u901f\u7387 <code>R = 50 kb\/s<\/code><\/li>\n\n\n\n<li>\u6570\u636e\u5e27\u957f <code>L = 1 kbit<\/code><\/li>\n\n\n\n<li>\u6240\u4ee5\u53d1\u9001\u65f6\u5ef6<\/li>\n<\/ul>\n\n\n\n<p><code>T_d = 1000 \/ 50000 = 0.02 s = 20 ms<\/code><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5355\u5411\u4f20\u64ad\u65f6\u5ef6 <code>T_p = 270 ms<\/code><\/li>\n\n\n\n<li>\u5f80\u8fd4\u4f20\u64ad\u65f6\u5ef6 <code>2T_p = 540 ms<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u56e0\u4e3a\u9898\u76ee\u8bf4\u91c7\u7528\u634e\u5e26\u786e\u8ba4\uff0c\u6240\u4ee5\u786e\u8ba4\u5e27\u53d1\u9001\u65f6\u95f4\u4e0d\u5355\u72ec\u8ba1\u5165\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">1\uff09\u505c\u6b62-\u7b49\u5f85\u534f\u8bae<\/h3>\n\n\n\n<p><code>U = T_d \/ (T_d + 2T_p)<\/code><\/p>\n\n\n\n<p>\u4ee3\u5165\uff1a<\/p>\n\n\n\n<p><code>U = 20 \/ (20 + 540) = 20 \/ 560 = 1 \/ 28<\/code><\/p>\n\n\n\n<p>\u6240\u4ee5\uff1a<\/p>\n\n\n\n<p><strong><code>U = 3.57%<\/code><\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2\uff09GBN \u534f\u8bae<\/h3>\n\n\n\n<p>3 bit \u5e8f\u53f7\uff0cGBN \u6700\u5927\u53d1\u9001\u7a97\u53e3\uff1a<\/p>\n\n\n\n<p><code>W = 2^3 - 1 = 7<\/code><\/p>\n\n\n\n<p>\u56e0\u6b64\uff1a<\/p>\n\n\n\n<p><code>U = min{1, 7 \u00d7 20 \/ 560} = 140 \/ 560 = 0.25<\/code><\/p>\n\n\n\n<p>\u6240\u4ee5\uff1a<\/p>\n\n\n\n<p><strong><code>U = 25%<\/code><\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3\uff09SR \u534f\u8bae\uff08\u53d1\u9001\u7a97\u53e3\u548c\u63a5\u6536\u7a97\u53e3\u76f8\u7b49\uff09<\/h3>\n\n\n\n<p>3 bit \u5e8f\u53f7\u65f6\uff0cSR \u6700\u5927\u7a97\u53e3\uff1a<\/p>\n\n\n\n<p><code>W = 2^(3-1) = 4<\/code><\/p>\n\n\n\n<p>\u56e0\u6b64\uff1a<\/p>\n\n\n\n<p><code>U = min{1, 4 \u00d7 20 \/ 560} = 80 \/ 560 = 1 \/ 7<\/code><\/p>\n\n\n\n<p>\u6240\u4ee5\uff1a<\/p>\n\n\n\n<p><strong><code>U = 14.29%<\/code><\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u672c\u9898\u7ed3\u8bba<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u505c\u6b62-\u7b49\u5f85\uff1a<strong>3.57%<\/strong><\/li>\n\n\n\n<li>GBN\uff1a<strong>25%<\/strong><\/li>\n\n\n\n<li>SR\uff1a<strong>14.29%<\/strong><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u8fd9\u9898\u771f\u6b63\u8003\u4ec0\u4e48<\/h3>\n\n\n\n<p>\u8fd9\u9898\u6700\u60f3\u8003\u7684\u4e0d\u662f\u8ba1\u7b97\uff0c\u800c\u662f\u8ba9\u4eba\u771f\u6b63\u660e\u767d\uff1a<\/p>\n\n\n\n<p>\u5728\u7ed9\u5b9a\u5e8f\u53f7\u4f4d\u6570\u3001\u4e14\u53d1\u9001\u7a97\u53e3\u548c\u63a5\u6536\u7a97\u53e3\u76f8\u7b49\u7684\u6761\u4ef6\u4e0b\uff0c<br><strong>GBN \u7684\u6700\u5927\u65e0\u5dee\u9519\u5229\u7528\u7387\u786e\u5b9e\u53ef\u80fd\u9ad8\u4e8e SR\u3002<\/strong><\/p>\n\n\n\n<p>\u8fd9\u662f\u5f88\u591a\u4eba\u7b2c\u4e00\u6b21\u505a\u4f1a\u9519\u7684\u5730\u65b9\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u8fd9\u90e8\u5206\u6700\u5bb9\u6613\u51fa\u9519\u7684\u51e0\u4e2a\u9677\u9631\uff0c\u5efa\u8bae\u5355\u72ec\u8bb0\u4f4f<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u7b2c\u4e00\u7c7b\u9519\u8bef\uff1a\u628a\u201cGBN \u66f4\u9ad8\u6548\u201d\u548c\u201cSR \u66f4\u9ad8\u6548\u201d\u673a\u68b0\u5316<\/h3>\n\n\n\n<p>\u5e94\u8be5\u8fd9\u6837\u8bb0\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u65e0\u5dee\u9519\u65f6\uff1a\u4e24\u8005\u516c\u5f0f\u5f62\u5f0f\u76f8\u540c\uff0c\u8c01\u7a97\u53e3\u66f4\u5927\u8c01\u6d41\u6c34\u7ebf\u66f4\u957f<\/li>\n\n\n\n<li>\u6709\u5dee\u9519\u65f6\uff1aSR \u53ea\u91cd\u4f20\u9519\u5e27\uff0c\u56e0\u6b64\u6548\u7387\u901a\u5e38\u4f18\u4e8e GBN<\/li>\n<\/ul>\n\n\n\n<p>\u6240\u4ee5\u201c\u8c01\u66f4\u9ad8\u6548\u201d\u5fc5\u987b\u770b\u9898\u76ee\u5230\u5e95\u5728\u6bd4\u4ec0\u4e48\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u7b2c\u4e8c\u7c7b\u9519\u8bef\uff1a\u628a\u53d1\u9001\u7a97\u53e3\u9650\u5236\u516c\u5f0f\u8bb0\u6df7<\/h3>\n\n\n\n<p>\u76f4\u63a5\u5f3a\u8bb0\u6210\u4e09\u6761\u6700\u7a33\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u505c\u6b62-\u7b49\u5f85\uff1a<code>W_T = 1\uff0cW_R = 1<\/code><\/li>\n\n\n\n<li>GBN\uff1a<code>W_R = 1\uff0cW_T &lt;= 2^n - 1<\/code><\/li>\n\n\n\n<li>SR\uff1a<code>W_T + W_R &lt;= 2^n<\/code>\n<ul class=\"wp-block-list\">\n<li>\u82e5\u53d1\u6536\u7a97\u53e3\u76f8\u7b49\uff0c\u5219\u90fd\u4e0d\u8d85\u8fc7 <code>2^(n-1)<\/code><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u7b2c\u4e09\u7c7b\u9519\u8bef\uff1a\u5229\u7528\u7387\u516c\u5f0f\u91cc\u5fd8\u8bb0\u4f20\u64ad\u65f6\u5ef6\u8981\u5f80\u8fd4<\/h3>\n\n\n\n<p>\u53ea\u8981\u534f\u8bae\u91cc\u201c\u53d1\u51fa\u53bb\u540e\u8981\u7b49\u786e\u8ba4\u56de\u6765\u201d\uff0c\u90a3\u7b49\u5f85\u91cc\u5c31\u4e00\u5b9a\u4f1a\u51fa\u73b0\u5f80\u8fd4\u4f20\u64ad\u65f6\u5ef6\u3002<br>\u6240\u4ee5\u7ecf\u5e38\u662f <code>2T_p<\/code>\uff0c\u8fd9\u4e00\u70b9\u5f88\u5bb9\u6613\u6f0f\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u7b2c\u56db\u7c7b\u9519\u8bef\uff1a\u770b\u5230\u201c\u63a5\u6536\u7a97\u53e3\u201d\u8fd8\u5728\u6309 GBN \u601d\u7ef4\u505a<\/h3>\n\n\n\n<p>GBN \u7684\u63a5\u6536\u7a97\u53e3\u56fa\u5b9a\u5c31\u662f 1\u3002<br>\u53ea\u8981\u9898\u91cc\u63a5\u6536\u65b9\u80fd\u7f13\u5b58\u5931\u5e8f\u5e27\u3001\u80fd\u6709\u5927\u4e8e 1 \u7684\u63a5\u6536\u7a97\u53e3\uff0c\u57fa\u672c\u5c31\u662f SR \u7684\u601d\u8def\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u6700\u540e\u628a\u8fd9\u90e8\u5206\u538b\u7f29\u6210\u4e00\u4e2a\u771f\u6b63\u505a\u9898\u65f6\u53ef\u76f4\u63a5\u8c03\u7528\u7684\u5224\u65ad\u6846\u67b6<\/h2>\n\n\n\n<p>\u9047\u5230\u8fd9\u7c7b\u9898\uff0c\u5efa\u8bae\u56fa\u5b9a\u6309\u8fd9 4 \u6b65\u8d70\uff1a<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u7b2c\u4e00\u6b65\uff1a\u5148\u8fa8\u534f\u8bae\u7c7b\u578b<\/h3>\n\n\n\n<p>\u5148\u770b\u662f\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u505c\u6b62-\u7b49\u5f85<\/li>\n\n\n\n<li>GBN<\/li>\n\n\n\n<li>SR<\/li>\n<\/ul>\n\n\n\n<p>\u4e0d\u8981\u4e00\u4e0a\u6765\u5c31\u7b97\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u7b2c\u4e8c\u6b65\uff1a\u7acb\u523b\u5199\u51fa\u7a97\u53e3\u7ea6\u675f<\/h3>\n\n\n\n<p>\u770b\u5230\u5e8f\u53f7\u4f4d\u6570\u5c31\u7acb\u523b\u60f3\u5230\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>GBN\uff1a<code>W_T &lt;= 2^n - 1<\/code><\/li>\n\n\n\n<li>SR\uff1a<code>W_T + W_R &lt;= 2^n<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u8fd9\u662f\u89e3\u5927\u591a\u6570\u9898\u7684\u8d77\u70b9\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u7b2c\u4e09\u6b65\uff1a\u518d\u770b\u5229\u7528\u7387\u516c\u5f0f<\/h3>\n\n\n\n<p>\u82e5\u8003\u5229\u7528\u7387\uff0c\u5148\u6c42\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>T_d<\/code><\/li>\n\n\n\n<li><code>T_ack<\/code><\/li>\n\n\n\n<li><code>T_p<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u518d\u4ee3\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u505c\u6b62-\u7b49\u5f85\uff1a<code>U = T_d \/ (T_d + 2T_p + T_ack)<\/code><\/li>\n\n\n\n<li>\u6ed1\u52a8\u7a97\u53e3\uff1a<code>U = min{1, W \u00d7 T_d \/ (T_d + 2T_p + T_ack)}<\/code><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u7b2c\u56db\u6b65\uff1a\u6700\u540e\u7ed3\u5408\u534f\u8bae\u7279\u6027\u5224\u65ad<\/h3>\n\n\n\n<p>\u4f8b\u5982\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>GBN \u8d85\u65f6\u540e\u91cd\u4f20\u4e00\u4e32<\/li>\n\n\n\n<li>SR \u53ea\u91cd\u4f20\u4e2a\u522b\u5e27<\/li>\n\n\n\n<li>GBN \u7d2f\u8ba1\u786e\u8ba4<\/li>\n\n\n\n<li>SR \u5355\u72ec\u786e\u8ba4<\/li>\n\n\n\n<li>GBN \u63a5\u6536\u7a97\u53e3\u56fa\u5b9a\u4e3a 1<\/li>\n<\/ul>\n\n\n\n<p>\u8fd9\u4e00\u6b65\u901a\u5e38\u51b3\u5b9a\u9009\u62e9\u9898\u80fd\u4e0d\u80fd\u9009\u5bf9\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u4e00\u5757\u5728 408 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[&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[54],"tags":[],"class_list":["post-1919","post","type-post","status-publish","format-standard","hentry","category-text"],"_links":{"self":[{"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/posts\/1919","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/comments?post=1919"}],"version-history":[{"count":2,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/posts\/1919\/revisions"}],"predecessor-version":[{"id":1922,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/posts\/1919\/revisions\/1922"}],"wp:attachment":[{"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/media?parent=1919"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/categories?post=1919"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/tags?post=1919"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}