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class="hm"> <span class="xg1">查看:</span> <span class="xi1">1992</span><span class="pipe">|</span><span class="xg1">回复:</span> <span class="xi1">0</span> </div> </td> <td class="plc ptm pbn"> <div class="y"> <a href="forum.php?mod=viewthread&action=printable&tid=1305091" title="打印" target="_blank"><img src="static/image/common/print.png" alt="打印" class="vm" /></a> </div> <h1 class="ts"> <a href="thread-1305091-1-1.html" id="thread_subject">LTE RLC介绍</a> <span class="xw0 xs1 xg1"> <a href="thread-1305091-1-1.html" onclick="return copyThreadUrl(this)" title="您的朋友访问此链接后，您将获得相应的积分奖励">[复制链接]</a> </span> </h1> </td> </tr> </table> </div>  <style>.c_table{border:1px solid #C2D5E3;margin-bottom:10px;}.c_table_t{border:1px solid #C2D5E3; border-bottom:0px solid #C2D5E3;}</style><div id="post_13601560" class="c_table"><style type="text/css"> .rev{margin-top:-4px;margin-left:10px;margin-right:2px;} .revp{padding:10px 0 10px 0;} .revp .avatar{margin-top:-5px; margin-left:3px; width:24px; 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</div> <div id="g_up13601560_menu" class="tip tip_4" style="display: none;"> <div class="tip_horn"></div> <div class="tip_c">列兵, 积分 34, 距离下一级还需 16 积分</div> </div> <dl class="pil cl xg2">注册：2015-10-29</dl> <ul class="xl xl2 o cl"> <li class="callon"><a href="home.php?mod=space&uid=1165543" target="_blank" title="串个门" class="xi2">串个门</a></li> <li class="buddy"><a href="home.php?mod=spacecp&ac=friend&op=add&uid=1165543&handlekey=addfriendhk_1165543" id="a_friend_li_13601560" onclick="showWindow(this.id, this.href, 'get', 1, {'ctrlid':this.id,'pos':'00'});" title="加好友" class="xi2">加好友</a></li> <li class="poke2"><a href="home.php?mod=spacecp&ac=poke&op=send&uid=1165543" id="a_poke_li_13601560" onclick="showWindow(this.id, this.href, 'get', 0);" title="打招呼" class="xi2">打招呼</a></li> <li class="pm2"><a href="home.php?mod=spacecp&ac=pm&op=showmsg&handlekey=showmsg_1165543&touid=1165543&pmid=0&daterange=2&pid=13601560&tid=1305091" onclick="showWindow('sendpm', this.href);" title="发消息" class="xi2">发消息</a></li> </ul> </td> <td class="plc"> <div class="pi"> <div id="fj" class="y"> <label class="z">电梯直达</label> <input type="text" class="px p_fre z" size="2" onkeyup="$('fj_btn').href='forum.php?mod=redirect&ptid=1305091&authorid=0&postno='+this.value" onkeydown="if(event.keyCode==13) {window.location=$('fj_btn').href;return false;}" title="跳转到指定楼层" /> <a href="javascript:;" id="fj_btn" class="z" title="跳转到指定楼层"><img src="static/image/common/fj_btn.png" alt="跳转到指定楼层" class="vm" /></a> </div> <strong> <a href="thread-1305091-1-1.html" title="您的朋友访问此链接后，您将获得相应的积分奖励" id="postnum13601560" onclick="setCopy(this.href, '帖子地址复制成功');return false;"><em>1</em><sup>#</sup></a> </strong> <span> <em onclick="$('postmessage_13601560').className='t_bigfont'">大</em> <em onclick="$('postmessage_13601560').className='t_msgfont'">中</em> <em onclick="$('postmessage_13601560').className='t_smallfont'">小</em> <em onclick="$('pid13601560').style.background='#CCE8CF'" class="col col_1"></em> <em onclick="$('pid13601560').style.background='#FFFFFF'" class="col"></em> </span> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon13601560" src="static/image/common/online_member.gif" /> <em id="authorposton13601560">发表于 2023-11-3 17:00:48</em> <span class="pipe">|</span><a href="forum.php?mod=viewthread&tid=1305091&page=1&authorid=1165543" rel="nofollow">只看该作者</a> <span class="pipe">|</span><a href="forum.php?mod=viewthread&tid=1305091&extra=page%3D1&ordertype=1">倒序浏览</a> </div> </div> </div><div class="pct"><style type="text/css">.pcb{margin-right:0}</style><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_13601560"> <div style="text-align:left">RLC<font face="楷体">层位于</font><font face="Times New Roman">PDCP</font><font face="楷体">层和</font><font face="Times New Roman">MAC</font><font face="楷体">层之间。它通过</font>SAP<font face="楷体">（</font><font face="Times New Roman">Service</font> Access Point<font face="楷体">）与</font><font face="Times New Roman">PDCP</font><font face="楷体">层进行通信，并通过逻辑信道与</font><font face="Times New Roman">MAC</font><font face="楷体">层进行通信。每个</font><font face="Times New Roman">U</font>E<font face="楷体">的每个逻辑信道都有一个</font><font face="Times New Roman">R</font>LC<font face="楷体">实体</font><font face="楷体">（</font><font face="Times New Roman">R</font>LC entity<font face="楷体">）。</font><font face="Times New Roman">RLC</font><font face="楷体">实体从</font><font face="Times New Roman">PDCP</font><font face="楷体">层接收到的数据，或发往</font><font face="Times New Roman">PDCP</font><font face="楷体">层的数据被称作</font><font face="Times New Roman">RLC SDU</font><font face="楷体">（或</font><font face="Times New Roman">PD</font>CP PDU<font face="楷体">）。</font><font face="Times New Roman">RLC</font><font face="楷体">实体从</font><font face="Times New Roman">MAC</font><font face="楷体">层接收到的数据，或发往</font>MAC<font face="楷体">层的数据被称作</font><font face="Times New Roman">RLC </font>P<font face="Times New Roman">DU</font><font face="楷体">（或</font>MAC SDU）。</div><br /> <div style="text-align:left">RLC<font face="楷体">层主要负责（见</font><font face="Times New Roman">36.322</font><font face="楷体">）：</font></div><div style="text-align:left"><font face="楷体"><br /> </font></div><div style="text-align:left">· <strong><font face="楷体">分段</font>/<font face="楷体">串联和重组</font><font face="Times New Roman">RLC SDU</font></strong><font face="楷体">（</font>concatenation/segmentation/reassembly<font face="楷体">，只适用于</font><font face="Times New Roman">UM</font><font face="楷体">和</font><font face="Times New Roman">AM</font><font face="楷体">模式）：</font><font face="Times New Roman">RLC PDU</font><font face="楷体">的大小是由</font><font face="Times New Roman">MAC</font><font face="楷体">层指定的，其大小通常并不等于</font><font face="Times New Roman">RLC SDU</font><font face="楷体">的大小，所以在发送端需要分段</font><font face="Times New Roman">/</font><font face="楷体">串联</font><font face="Times New Roman">RLC SDU</font><font face="楷体">以便其匹配</font><font face="Times New Roman">MAC</font><font face="楷体">层指定的大小。相应地，在接收端需要对之前分段的</font><font face="Times New Roman">RLC SDU</font><font face="楷体">进行重组，以便恢复出原来的</font><font face="Times New Roman">RLC SDU</font><font face="楷体">并按序递送（</font><font face="Times New Roman">in-sequence delivery</font><font face="楷体">）</font>给<font face="楷体">上层。</font></div><div style="text-align:left"><font face="楷体"><br /> </font></div><div style="text-align:left">· <font face="楷体">通过</font><strong>ARQ</strong><font face="楷体">来进行纠错（只适用于</font>AM<font face="楷体">模式）：</font><font face="Times New Roman">MAC</font><font face="楷体">层的</font><font face="Times New Roman">HARQ</font><font face="楷体">机制的目标在于实现非常快速的重传，其反馈出错率大概在</font><font face="Times New Roman">1%</font><font face="楷体">左右。对于某些业务，如</font><font face="Times New Roman">TCP</font><font face="楷体">传输（要求丢包率小于</font><img width="29" height="21" file="file:///C:/Users/Qiang/AppData/Local/Temp/ksohtml4832/wps1.png" border="0" alt="" /><font face="楷体">），</font>HARQ<font face="楷体">反馈的出错率就显得过高了。对于这类业务， </font><font face="Times New Roman">RLC</font><font face="楷体">层的重传处理能够进一步降低反馈出错率。</font></div><div style="text-align:left"><font face="楷体"><br /> </font></div><div style="text-align:left">· <font face="楷体">对</font>RLC data PDU<font face="楷体">进行</font><strong><font face="楷体">重排序</font></strong><font face="楷体">（</font>reordering<font face="楷体">，只适用于</font><font face="Times New Roman">UM</font><font face="楷体">和</font><font face="Times New Roman">AM</font><font face="楷体">模式）：</font><font face="Times New Roman">MAC</font><font face="楷体">层的</font><font face="Times New Roman">HARQ</font><font face="楷体">操作可能导致到达</font><font face="Times New Roman">RLC</font><font face="楷体">层的报文是乱序的，所以需要</font><font face="Times New Roman">RLC</font><font face="楷体">层对数据进行重排序。重排序是根据序列号</font>（Sequence Number<font face="楷体">，</font><font face="Times New Roman">S</font>N<font face="楷体">）的先后顺序对</font><font face="Times New Roman">R</font>LC data PDU<font face="楷体">进行排序的</font>。</div><br /> <div style="text-align:left">· <strong><font face="楷体">复包检重测</font></strong><font face="楷体">（</font>duplicate detection<font face="楷体">，只适用于</font><font face="Times New Roman">UM</font><font face="楷体">和</font><font face="Times New Roman">AM</font><font face="楷体">模式）：出现重复包的最大可能性为发送端反馈了</font><font face="Times New Roman">HARQ ACK</font><font face="楷体">，但接收端错误地将其解释为</font><font face="Times New Roman">NACK</font><font face="楷体">，从而导致了不必要的</font><font face="Times New Roman">MAC PDU</font><font face="楷体">重传。</font></div><div style="text-align:left"><font face="楷体"><br /> </font></div><div style="text-align:left"><font face="楷体">对</font>RLC data PDU<font face="楷体">进行</font><strong><font face="楷体">重分段</font></strong><font face="楷体">（</font>resegmentation<font face="楷体">，只适用于</font><font face="Calibri">AM</font><font face="楷体">模式）：当</font><font face="Calibri">RLC data PDU</font><font face="楷体">（注意：这里不是</font><font face="Calibri">SDU</font><font face="楷体">）需要重传时，可能需要进行重分段。例如</font>，<font face="楷体">当</font>MAC<font face="楷体">层指定的大小</font>小于需要重传的<font face="楷体">原始</font>RLC data PDU的<font face="楷体">大小时，就需要对原始</font><font face="Calibri">RLC data</font> PDU<font face="楷体">进行重分段。</font></div> </td></tr></table> </div> <div id="comment_13601560" class="cm"> </div> <link type="text/css" rel="stylesheet" href="source/plugin/cr180_viewthread_module/template/images/style.css"><div id="cr180_digestbox"></div><script type="text/javascript">var auc_list_tmp = $('auc_list_tmp');if(auc_list_tmp !== null){document.write(auc_list_tmp.innerHTML);auc_list_tmp.innerHTML='';} function lalala(){ ajaxget('plugin.php?id=auction:involve&operation=view&tid=1305091&page=1', 'list_ajax'); $('list_ajax').style.display = 'block'; } if($('list_ajax')){setTimeout('lalala()', 1000);} </script><div id="post_rate_div_13601560"></div> </div></div> </td></tr> <tr><td class="plc plm"> <div id="usertopic"></div> <script 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