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index.html
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<!DOCTYPE html>
<html lang="zh-CN,en,default">
<head hexo-theme='https://github.com/volantis-x/hexo-theme-volantis/#6.0.0-alpha.0'>
<meta name="generator" content="Hexo 7.3.0">
<meta name="Volantis" content="6.0.0-alpha.0">
<meta charset="utf-8">
<!-- SEO相关 -->
<link rel="canonical" href="https://imqinhao.cn/gsm/"/>
<!-- 渲染优化 -->
<meta http-equiv='x-dns-prefetch-control' content='on' />
<link rel='dns-prefetch' href='https://unpkg.com'>
<link rel="preconnect" href="https://unpkg.com" crossorigin>
<link rel='dns-prefetch' href='https://cdn.bootcdn.net'>
<link rel="preconnect" href="https://cdn.bootcdn.net" crossorigin>
<meta name="renderer" content="webkit">
<meta name="force-rendering" content="webkit">
<meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1">
<meta http-equiv="Content-Security-Policy" content=" default-src 'self' https:; block-all-mixed-content; base-uri 'self' https:; form-action 'self' https:; worker-src 'self' https:; connect-src 'self' https: *; img-src 'self' data: https: *; media-src 'self' https: *; font-src 'self' data: https: *; frame-src 'self' https: *; manifest-src 'self' https: *; child-src https:; script-src 'self' https: 'unsafe-inline' *; style-src 'self' https: 'unsafe-inline' *; ">
<meta name="HandheldFriendly" content="True" >
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=5">
<meta content="black-translucent" name="apple-mobile-web-app-status-bar-style">
<meta content="telephone=no" name="format-detection">
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<link rel="preload" href="/css/style.css" as="style">
<link rel="preload" href="https://unpkg.com/volantis-static@0.0.1660614606622/media/fonts/VarelaRound/VarelaRound-Regular.ttf" as="font" type="font/ttf" crossorigin="anonymous">
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<title>GSM系统概述 - 覃浩的博客</title>
<meta name="keywords" content="通信技术,无线技术,通信原理,null">
<meta desc name="description" content="2G系统概述学习笔记 - 覃浩 - 覃浩的博客">
<meta property="og:type" content="article">
<meta property="og:title" content="GSM系统概述">
<meta property="og:url" content="https://imqinhao.cn/GSM/index.html">
<meta property="og:site_name" content="覃浩的博客">
<meta property="og:description" content="2G系统概述学习笔记">
<meta property="og:locale" content="zh_CN">
<meta property="og:image" content="https://unpkg.com/volantis-static@0.0.1660614606622/media/org.volantis/blog/favicon/android-chrome-192x192.png">
<meta property="article:published_time" content="2020-03-07T02:00:00.000Z">
<meta property="article:modified_time" content="2021-03-08T07:34:21.000Z">
<meta property="article:author" content="覃浩">
<meta property="article:tag" content="通信技术">
<meta property="article:tag" content="无线技术">
<meta property="article:tag" content="通信原理">
<meta name="twitter:card" content="summary">
<meta name="twitter:image" content="https://unpkg.com/volantis-static@0.0.1660614606622/media/org.volantis/blog/favicon/android-chrome-192x192.png">
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font-size: 3rem;
}
.cover-wrapper .cover-body .subtitle {
font-size: 1.05rem;
}
.cover-wrapper .cover-body .logo {
max-height: 150px;
}
}
.cover-wrapper .cover-body .m_search {
position: relative;
max-width: calc(100% - 16px);
width: 320px;
vertical-align: middle;
}
.cover-wrapper .cover-body .m_search .form {
position: relative;
display: -webkit-box /* OLD - iOS 6-, Safari 3.1-6 */;
display: -moz-box /* OLD - Firefox 19- (buggy but mostly works) */;
display: block;
width: 100%;
}
.cover-wrapper .cover-body .m_search .icon,
.cover-wrapper .cover-body .m_search .input {
transition: all 0.28s ease;
-webkit-transition: all 0.28s ease;
-khtml-transition: all 0.28s ease;
-moz-transition: all 0.28s ease;
-o-transition: all 0.28s ease;
-ms-transition: all 0.28s ease;
}
.cover-wrapper .cover-body .m_search .icon {
position: absolute;
display: -webkit-box /* OLD - iOS 6-, Safari 3.1-6 */;
display: -moz-box /* OLD - Firefox 19- (buggy but mostly works) */;
display: block;
line-height: 2.5rem;
width: 32px;
top: 0;
left: 5px;
color: rgba(68,68,68,0.75);
}
.cover-wrapper .cover-body .m_search .input {
display: -webkit-box /* OLD - iOS 6-, Safari 3.1-6 */;
display: -moz-box /* OLD - Firefox 19- (buggy but mostly works) */;
display: block;
height: 2.5rem;
width: 100%;
box-shadow: none;
-webkit-box-shadow: none;
box-sizing: border-box;
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
font-size: 0.875rem;
-webkit-appearance: none;
padding-left: 36px;
border-radius: 1.4rem;
-webkit-border-radius: 1.4rem;
background: rgba(255,255,255,0.6);
backdrop-filter: blur(10px);
border: none;
color: var(--color-text);
}
@media screen and (max-width: 500px) {
.cover-wrapper .cover-body .m_search .input {
padding-left: 36px;
}
}
.cover-wrapper .cover-body .m_search .input:hover {
background: rgba(255,255,255,0.8);
}
.cover-wrapper .cover-body .m_search .input:focus {
background: #fff;
}
.cover-wrapper .list-h {
display: -webkit-box /* OLD - iOS 6-, Safari 3.1-6 */;
display: -moz-box /* OLD - Firefox 19- (buggy but mostly works) */;
display: -ms-flexbox /* TWEENER - IE 10 */;
display: -webkit-flex /* NEW - Chrome */;
display: flex /* NEW, Spec - Opera 12.1, Firefox 20+ */;
display: flex;
-webkit-box-direction: normal;
-moz-box-direction: normal;
-webkit-box-orient: horizontal;
-moz-box-orient: horizontal;
-webkit-flex-direction: row;
-ms-flex-direction: row;
flex-direction: row;
flex-wrap: wrap;
-webkit-flex-wrap: wrap;
-khtml-flex-wrap: wrap;
-moz-flex-wrap: wrap;
-o-flex-wrap: wrap;
-ms-flex-wrap: wrap;
align-items: stretch;
border-radius: 4px;
-webkit-border-radius: 4px;
user-select: none;
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
}
.cover-wrapper .list-h a {
-webkit-box-flex: 1;
-moz-box-flex: 1;
-webkit-flex: 1 0;
-ms-flex: 1 0;
flex: 1 0;
display: -webkit-box /* OLD - iOS 6-, Safari 3.1-6 */;
display: -moz-box /* OLD - Firefox 19- (buggy but mostly works) */;
display: -ms-flexbox /* TWEENER - IE 10 */;
display: -webkit-flex /* NEW - Chrome */;
display: flex /* NEW, Spec - Opera 12.1, Firefox 20+ */;
display: flex;
font-weight: 600;
}
.cover-wrapper .list-h a img {
display: -webkit-box /* OLD - iOS 6-, Safari 3.1-6 */;
display: -moz-box /* OLD - Firefox 19- (buggy but mostly works) */;
display: block;
border-radius: 2px;
-webkit-border-radius: 2px;
margin: 4px;
min-width: 40px;
max-width: 44px;
}
@media screen and (max-width: 768px) {
.cover-wrapper .list-h a img {
min-width: 36px;
max-width: 40px;
}
}
@media screen and (max-width: 500px) {
.cover-wrapper .list-h a img {
margin: 2px 4px;
min-width: 32px;
max-width: 36px;
}
}
@media screen and (max-width: 375px) {
.cover-wrapper .list-h a img {
min-width: 28px;
max-width: 32px;
}
}
.cover-wrapper {
max-width: 100%;
}
.cover-wrapper.search .bottom .menu {
margin-top: 16px;
}
.cover-wrapper.search .bottom .menu .list-h a {
white-space: nowrap;
-webkit-box-direction: normal;
-moz-box-direction: normal;
-webkit-box-orient: horizontal;
-moz-box-orient: horizontal;
-webkit-flex-direction: row;
-ms-flex-direction: row;
flex-direction: row;
align-items: baseline;
padding: 2px;
margin: 4px;
color: var(--color-site-inner);
opacity: 0.75;
-webkit-opacity: 0.75;
-moz-opacity: 0.75;
text-shadow: 0 1px 2px rgba(0,0,0,0.05);
border-bottom: 2px solid transparent;
}
.cover-wrapper.search .bottom .menu .list-h a i {
margin-right: 4px;
}
.cover-wrapper.search .bottom .menu .list-h a p {
font-size: 0.9375rem;
}
.cover-wrapper.search .bottom .menu .list-h a:hover,
.cover-wrapper.search .bottom .menu .list-h a.active,
.cover-wrapper.search .bottom .menu .list-h a:active {
opacity: 1;
-webkit-opacity: 1;
-moz-opacity: 1;
border-bottom: 2px solid var(--color-site-inner);
}
.cover-wrapper.dock .menu,
.cover-wrapper.featured .menu,
.cover-wrapper.focus .menu {
border-radius: 6px;
-webkit-border-radius: 6px;
}
.cover-wrapper.dock .menu .list-h a,
.cover-wrapper.featured .menu .list-h a,
.cover-wrapper.focus .menu .list-h a {
-webkit-box-direction: normal;
-moz-box-direction: normal;
-webkit-box-orient: vertical;
-moz-box-orient: vertical;
-webkit-flex-direction: column;
-ms-flex-direction: column;
flex-direction: column;
align-items: center;
padding: 12px;
line-height: 24px;
border-radius: 4px;
-webkit-border-radius: 4px;
border-bottom: none;
text-align: center;
align-content: flex-end;
color: rgba(68,68,68,0.7);
font-size: 1.5rem;
}
@media screen and (max-width: 500px) {
.cover-wrapper.dock .menu .list-h a,
.cover-wrapper.featured .menu .list-h a,
.cover-wrapper.focus .menu .list-h a {
padding: 12px 8px;
}
}
.cover-wrapper.dock .menu .list-h a i,
.cover-wrapper.featured .menu .list-h a i,
.cover-wrapper.focus .menu .list-h a i {
margin: 8px;
}
.cover-wrapper.dock .menu .list-h a p,
.cover-wrapper.featured .menu .list-h a p,
.cover-wrapper.focus .menu .list-h a p {
font-size: 0.875rem;
}
.cover-wrapper.dock .menu .list-h a.active,
.cover-wrapper.featured .menu .list-h a.active,
.cover-wrapper.focus .menu .list-h a.active {
background: var(--color-card);
backdrop-filter: none;
}
.cover-wrapper.dock .menu .list-h a.active i,
.cover-wrapper.featured .menu .list-h a.active i,
.cover-wrapper.focus .menu .list-h a.active i,
.cover-wrapper.dock .menu .list-h a.active i+p,
.cover-wrapper.featured .menu .list-h a.active i+p,
.cover-wrapper.focus .menu .list-h a.active i+p {
color: #3dd9b6;
}
.cover-wrapper.dock .menu .list-h a.active img+p,
.cover-wrapper.featured .menu .list-h a.active img+p,
.cover-wrapper.focus .menu .list-h a.active img+p {
color: var(--color-text);
}
.cover-wrapper.dock .menu .list-h a:hover,
.cover-wrapper.featured .menu .list-h a:hover,
.cover-wrapper.focus .menu .list-h a:hover {
background: var(--color-card);
}
.cover-wrapper.dock .top {
margin-bottom: 48px;
}
.cover-wrapper.dock .menu {
background: rgba(255,255,255,0.5);
position: absolute;
bottom: 0;
max-width: 100%;
}
.cover-wrapper.dock .menu .list-h {
flex-wrap: nowrap;
-webkit-flex-wrap: nowrap;
-khtml-flex-wrap: nowrap;
-moz-flex-wrap: nowrap;
-o-flex-wrap: nowrap;
-ms-flex-wrap: nowrap;
margin: 4px;
}
.cover-wrapper.dock .menu .list-h a+a {
margin-left: 4px;
}
@media screen and (max-width: 500px) {
.cover-wrapper.dock .menu .list-h {
overflow-x: scroll;
}
.cover-wrapper.dock .menu .list-h::-webkit-scrollbar {
height: 0;
width: 0;
}
.cover-wrapper.dock .menu .list-h::-webkit-scrollbar-track-piece {
background: transparent;
}
.cover-wrapper.dock .menu .list-h::-webkit-scrollbar-thumb {
background: #3dd9b6;
cursor: pointer;
border-radius: 0;
-webkit-border-radius: 0;
}
.cover-wrapper.dock .menu .list-h::-webkit-scrollbar-thumb:hover {
background: #ff5722;
}
}
@supports (backdrop-filter: blur(20px)) {
.cover-wrapper.dock .menu {
background: rgba(255,255,255,0.5);
backdrop-filter: saturate(200%) blur(20px);
}
}
.cover-wrapper #parallax-window {
position: absolute;
width: 100%;
height: 100%;
background: transparent;
}
.parallax-mirror {
animation-delay: 0s;
animation-duration: 0.5s;
animation-fill-mode: forwards;
animation-timing-function: ease-out;
animation-name: fadeIn;
}
@-moz-keyframes fadeIn {
0% {
opacity: 0;
-webkit-opacity: 0;
-moz-opacity: 0;
filter: blur(12px);
}
100% {
opacity: 1;
-webkit-opacity: 1;
-moz-opacity: 1;
}
}
@-webkit-keyframes fadeIn {
0% {
opacity: 0;
-webkit-opacity: 0;
-moz-opacity: 0;
filter: blur(12px);
}
100% {
opacity: 1;
-webkit-opacity: 1;
-moz-opacity: 1;
}
}
@-o-keyframes fadeIn {
0% {
opacity: 0;
-webkit-opacity: 0;
-moz-opacity: 0;
filter: blur(12px);
}
100% {
opacity: 1;
-webkit-opacity: 1;
-moz-opacity: 1;
}
}
@keyframes fadeIn {
0% {
opacity: 0;
-webkit-opacity: 0;
-moz-opacity: 0;
filter: blur(12px);
}
100% {
opacity: 1;
-webkit-opacity: 1;
-moz-opacity: 1;
}
}
@font-face {
font-family: 'UbuntuMono';
src: url("https://unpkg.com/volantis-static@0.0.1660614606622/media/fonts/UbuntuMono/UbuntuMono-Regular.ttf");
font-weight: 'normal';
font-style: 'normal';
font-display: swap;
}
@font-face {
font-family: 'Varela Round';
src: url("https://unpkg.com/volantis-static@0.0.1660614606622/media/fonts/VarelaRound/VarelaRound-Regular.ttf");
font-weight: 'normal';
font-style: 'normal';
font-display: swap;
}
.l_header {
position: fixed;
z-index: 1000;
top: 0;
width: 100%;
height: 64px;
background: var(--color-card);
box-shadow: 0 1px 2px 0px rgba(0,0,0,0.1);
-webkit-box-shadow: 0 1px 2px 0px rgba(0,0,0,0.1);
}
.l_header.auto {
transition: opacity 0.4s ease;
-webkit-transition: opacity 0.4s ease;
-khtml-transition: opacity 0.4s ease;
-moz-transition: opacity 0.4s ease;
-o-transition: opacity 0.4s ease;
-ms-transition: opacity 0.4s ease;
visibility: hidden;
}
.l_header.auto.show {
opacity: 1 !important;
-webkit-opacity: 1 !important;
-moz-opacity: 1 !important;
visibility: visible;
}
.l_header .container {
margin-left: 16px;
margin-right: 16px;
}
.l_header #wrapper {
height: 100%;
user-select: none;
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
}
.l_header #wrapper .nav-main,
.l_header #wrapper .nav-sub {
display: -webkit-box /* OLD - iOS 6-, Safari 3.1-6 */;
display: -moz-box /* OLD - Firefox 19- (buggy but mostly works) */;
display: -ms-flexbox /* TWEENER - IE 10 */;
display: -webkit-flex /* NEW - Chrome */;
display: flex /* NEW, Spec - Opera 12.1, Firefox 20+ */;
display: flex;
flex-wrap: nowrap;
-webkit-flex-wrap: nowrap;
-khtml-flex-wrap: nowrap;
-moz-flex-wrap: nowrap;
-o-flex-wrap: nowrap;
-ms-flex-wrap: nowrap;
justify-content: space-between;
-webkit-justify-content: space-between;
-khtml-justify-content: space-between;
-moz-justify-content: space-between;
-o-justify-content: space-between;
-ms-justify-content: space-between;
align-items: center;
}
.l_header #wrapper .nav-main {
transition: all 0.28s ease;
-webkit-transition: all 0.28s ease;
-khtml-transition: all 0.28s ease;
-moz-transition: all 0.28s ease;
-o-transition: all 0.28s ease;
-ms-transition: all 0.28s ease;
}
.l_header #wrapper.sub .nav-main {
transform: translateY(-64px);
-webkit-transform: translateY(-64px);
-khtml-transform: translateY(-64px);
-moz-transform: translateY(-64px);
-o-transform: translateY(-64px);
-ms-transform: translateY(-64px);
}
.l_header #wrapper .nav-sub {
transition: all 0.28s ease;
-webkit-transition: all 0.28s ease;
-khtml-transition: all 0.28s ease;
-moz-transition: all 0.28s ease;
-o-transition: all 0.28s ease;
-ms-transition: all 0.28s ease;
opacity: 0;
-webkit-opacity: 0;
-moz-opacity: 0;
height: 64px;
width: calc(100% - 2 * 16px);
position: absolute;
}
.l_header #wrapper .nav-sub ::-webkit-scrollbar {
display: -webkit-box /* OLD - iOS 6-, Safari 3.1-6 */;
display: -moz-box /* OLD - Firefox 19- (buggy but mostly works) */;
display: none;
}
@media screen and (min-width: 2048px) {
.l_header #wrapper .nav-sub {
max-width: 55vw;
margin: auto;
}
}
.l_header #wrapper.sub .nav-sub {
opacity: 1;
-webkit-opacity: 1;
-moz-opacity: 1;
}
.l_header #wrapper .title {
position: relative;
color: var(--color-text);
padding-left: 24px;
max-height: 64px;
}
.l_header #wrapper .nav-main .title {
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
flex-shrink: 0;
line-height: 64px;
padding: 0 24px;
font-size: 1.25rem;
font-family: "Varela Round", "PingFang SC", "Microsoft YaHei", Helvetica, Arial, Helvetica, monospace;
}
.l_header #wrapper .nav-main .title img {
height: 64px;
}
.l_header .nav-sub {
max-width: 1080px;
margin: auto;
}
.l_header .nav-sub .title {
font-weight: bold;
font-family: UbuntuMono, "Varela Round", "PingFang SC", "Microsoft YaHei", Helvetica, Arial, Menlo, Monaco, monospace, sans-serif;
line-height: 1.2;
max-height: 64px;
white-space: normal;
flex-shrink: 1;
}
.l_header .switcher {
display: -webkit-box /* OLD - iOS 6-, Safari 3.1-6 */;
display: -moz-box /* OLD - Firefox 19- (buggy but mostly works) */;
display: none;
line-height: 64px;
align-items: center;
}
.l_header .switcher .s-toc {
display: -webkit-box /* OLD - iOS 6-, Safari 3.1-6 */;
display: -moz-box /* OLD - Firefox 19- (buggy but mostly works) */;
display: none;
}
@media screen and (max-width: 768px) {
.l_header .switcher .s-toc {
display: -webkit-box /* OLD - iOS 6-, Safari 3.1-6 */;
display: -moz-box /* OLD - Firefox 19- (buggy but mostly works) */;
display: -ms-flexbox /* TWEENER - IE 10 */;
display: -webkit-flex /* NEW - Chrome */;
display: flex /* NEW, Spec - Opera 12.1, Firefox 20+ */;
display: flex;
}
}
.l_header .switcher >li {
height: 48px;
transition: all 0.28s ease;
-webkit-transition: all 0.28s ease;
-khtml-transition: all 0.28s ease;
-moz-transition: all 0.28s ease;
-o-transition: all 0.28s ease;
-ms-transition: all 0.28s ease;
margin: 2px;
}
@media screen and (max-width: 500px) {
.l_header .switcher >li {
margin: 0 1px;
height: 48px;
}
}
.l_header .switcher >li >a {