5G优化案例SA接入成功率优化思路总结及案例分析Word格式.docx
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1.UE向gNB-DU发送RRC连接请求消息:
2.若UE接纳成功,则gNB-DU将RRC消息封装在初始ULRRC消息中发送
给gNB-CU。
初始ULRRC消息中包含gNB-DU分配的C-RNTI:
3.gNB-CU为UE分配gNB-CUUEF1APID,并生成RRC连接建立消息,
以上消息封装在DLRRC消息中发送给gNB-DU;
4.gNB-DU解析DLRRC消息,并生成RRC连接建立消息发送给UE:
5.UE向gNB-DU发送RRC连接建立完成消息:
6.gNB-DU将RRC连接建立完成消息封装在ULRRC消息中发送给gNB-CU;
7.gNB-CU向AMF发送初始UE消息消息;
8.AMF向gNB-CU发送初始的UE上下文建立请求消息:
9.gNB-CU发送UE上下文建立请求消息,用以在gNB-DU中建立UE上下文。
在此消息中,还可以封装RRC安全模式命令消息:
10.gNB-DU向UE发送安全模式命令消息;
11.gNB-DU将UE上下文建立响应消息发送给gNB-CU:
12.UE完成安全模式过程回复安全模式完成消息;
13.gNB-DU将安全模式完成消息封装在ULRRC消息传输消息中发送给gNB-CU;
14.gNB-CU生成RRC连接重配置消息,并将其封装在DLRRC消息中发送给gNB-DU:
15.gNB-DU向UE发送RRC连接重配置消息:
16.UE向gNB-DU发送RRC连接重配置完成消息:
17.gNB-DU将RRC连接重配完成消息封装在ULRRC消息传输消息中,并将其发送给gNB-CU;
18.gNB-CU向AMF发送初始UE上下文建立响应消息。
2SA接入信令解读
2.1SA接入前台信令
从UE侧看初始随机接入过程包含以下流程(以下信令及流程为终端飞行后注册流程):
1)读取系统消息;
2)RRC建立过程(包含随机接入过程):
3)上下行NAS直传、UE能力信息、鉴权、加密和注册过程;
4)PDU会话建立:
5)RRC重配(SRB/DRB建立):
6)SIP消息注册(若存在VOLTE/VONR,则有该流程)。
图2-1前台初始随机接入流程(注册流程)
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2.1.1SIB1消息解析
从SIB1消息中可获取初始随机接入相关参数,如下图所示:
包括了逻辑根序列索引,前导功率攀升步长及最大重传次数等参数。
图2-2SIB1消息接入相关参数
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从SIB1中可以获取UE相关左时骼,涉及到接入相关的如t300e
图2-3SIB1接入相关定时器
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2.1.2RRC连接建立过程信令解析
1)RRC连接建立消息中携带了SRB1信息及RLC.逻辑信道配宜。
图2-4RRC连接建立消息解读
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图2-5RRC连接建工完成消息解读
2.1.3UE能力查询信令解析
1)UE能力信息中包括支持的NR频段及该频段支持的功能,如上行256QAM
是否支持等信息。
图2-6UE能力信息解读
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每个频段SRS支持能力,见下图。
图2・7UE能力信息解读・SRS
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