patch the index.md under blog with 20230913 article

free5gc · Sep 13, 2023 · 072d927 · 072d927
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diff --git a/docs/blog/20230913.md b/docs/blog/20230913.md
@@ -1,5 +1,5 @@
 
-# CHarging Function(CHF) overview
+# CHarging Function(CHF) Overview
 
 The `charging function` is a crucial component of the 5G core network responsible for tasks such as `traffic calculation and quota management`. For network providers and administrators, it is one of the most critical network elements. This article will explain the fundamental concepts and mechanisms of charging, as well as highlight the differences between 4G and 5G charging. Finally, we will include information about the CHF implementation developed by the free5GC team.
 ![](20230913/CHF_preview.png)
@@ -36,7 +36,7 @@ Typical triggers for charging related to **network resource usage include**:
 
 ## High Level Common Architecture
 
-The diagram below is from [3GPP TS32.240-V15.5.0](https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=1896), which illustrates the architectural differences among the three charging systems and indicates through which reference points data is transmitted for each Network Element (NE).
+The diagram below is from [3GPP TS32.240-V15.5.0](https://www.tech-invite.com/3m32/toc/tinv-3gpp-32-240_c.html#e-4-2), which illustrates the architectural differences among the three charging systems and indicates through which reference points data is transmitted for each Network Element (NE).
 ![](20230913/High_Level_Common_Architecture.png)
 
 ---
@@ -146,6 +146,7 @@ Overall, **the key difference between 4G and 5G charging lies in the level of in
 * Ref: https://github.com/free5gc/chf
 
 ## Reference
-* [3GPP TS32.240 v15 spec](https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=1896)
+* [3GPP TS32.240 v15 spec(offline)](https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=1896)
+* [3GPP TS32.240 v15 spec(online)](https://www.tech-invite.com/3m32/tinv-3gpp-32-240.html#etoc)
 * https://devopedia.org/5g-service-based-architecture
 * https://free5gc.org/
diff --git a/docs/blog/index.md b/docs/blog/index.md
@@ -3,6 +3,7 @@
 # Blogs
 
 ## Official
+- [2023/9/13: CHarging Function(CHF) Overview](./20230913.md)
 - [2023/9/6: The role of VNFD and NSD in 5G Network Slicing](./0905-2023blog.md)
 - [2023/8/30: Article Sharing: eBPF: A New Approach to Cloud-Native Observability, Networking and Security for Current (5G) and Future Mobile Networks (6G and Beyond)](./20230830.md)
 - [2023/8/23: Web security: CSRF vulnerability in webconsole](./CSRF/20230823.md)