When you study the 5G user plane protocol stack, you must observe that the SDAP is added. Why does the NR system need SDAP?
- Jan 03 Fri 2020 18:04
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Why does 5G NR need Service Data Adaptation Protocol (SDAP)
When you study the 5G user plane protocol stack, you must observe that the SDAP is added. Why does the NR system need SDAP?
- Jul 25 Wed 2018 16:17
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RFC 4566 - Session Description Protocol (SDP) Introduction and example
In my previous article “
RFC 3261 – Session Initiation Protocol (SIP) Parameters
”, I introduced the purpose of each header in SIP_REGISTER message. So today, I think we can go a step further to talk about Session Description Protocol (SDP). When initiating a VoLTE/VoWiFi call or streaming video, phones and networks need to decide some media-related parameters like transport protocol or address... In order to determine these configurations, we need SDP to help us!
RFC 3261 – Session Initiation Protocol (SIP) Parameters
”, I introduced the purpose of each header in SIP_REGISTER message. So today, I think we can go a step further to talk about Session Description Protocol (SDP). When initiating a VoLTE/VoWiFi call or streaming video, phones and networks need to decide some media-related parameters like transport protocol or address... In order to determine these configurations, we need SDP to help us!
- Jun 22 Fri 2018 16:36
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RFC 3261 – Session Initiation Protocol (SIP) Parameters
A valid SIP request must contain the following header fields: To, From, CSeq, Call-ID, Max-Forwards, and Via. So today, I will use SIP_REGISTER message to be an example to introduce these headers.
- May 03 Thu 2018 16:29
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SIP Header 介紹 (1)
- Apr 23 Mon 2018 18:19
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25.331_8.1.1.6.1_System Information Block type 1
從上面的截圖可以知道System Information Block type 1 (SIB1)所帶的內容，都是UE在Idle/Connected mode用到的一些Timer值，如T302, T309…。這些Timer都很直觀，我這邊就不贅述。但Message中的cn-CommonGSM-MAP-NAS-SysInfo和cn-DomainSysInfoList我覺得可以介紹一下!
- Apr 23 Mon 2018 16:08
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24.081_2_Calling Line Identification Restriction (隱藏號碼)
- Sep 12 Tue 2017 10:11
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23.003_4.1_Location Area Identification
Location Area Identification (LAI)用來定義一個Location Area (for circuit switch)，由三個部分所組成: Mobile Country Code (MCC)、Mobile Network Code (MNC)、Location Area Code (LAC)
- Sep 08 Fri 2017 17:51
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25.331_8.1.8_Initial Direct Transfer
- Jun 28 Wed 2017 14:34
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Cell re-selection, Handover and Redirection
Before starting this topic, we should know what is IDLE and CONNECTED mode first. (#LTE RRC States)
1. Cell re-selection: IDLE mode -> IDLE mode
1. Cell re-selection: IDLE mode -> IDLE mode
1