折腾：
【整理】搞清楚RCS和IMS的架构逻辑关系
期间，多处
The application server providing the functionality is called Service layer IP-SM-GW.
The application server in IMS network responsible for SMSoIP is a Transport layer IP-SM-GW. According the specification 3GPP TS24.341 IP-SM-GW can translate SIP protocol in Sigtran and vice versa. In real life also other protocols as SMPP or Diameter can be used instead of Sigtran.
IWF performs protocol conversion between RCS messages and legacy messages like SMS and MMS, and forwards converted messages to non-RCS users and vice versa. The IWF consists of SMS-IWF and MMS-IWF functional components, and it may include Interworking Selection Function (ISF). The ISF determines which legacy messaging service is to be used in order to relay the RCS messages to non-RCS users. The ISF may determine the specific IWF functional component based on contents type and contents length and/or the operator may define their own criteria to select the interworking function. The SMS-IWF can interwork either with the Short Message Service Center (SM-SC) or IP-SM-GW for SMS interworking. In case of SM-SC interworking, the SMPP interface is used and the SMS-IWF shall act as an end point of SIP realm. In case of IP-SM-GW interworking, the IP-SM-GW takes the role of SIP end point. Therefore, the SMS-IWF provides the SIP interface towards the IMS core to access the IP-SM-GW. The SMS-IWF shall also have an MSRP interface with the IP-SM-GW to deliver RCS messages. When it comes to MMS interworking, the MMS-IWF has an MM4 interface with the Multimedia Service Center (MMSC).
都看到有提到：
IP-SM-GW
IP SM GW
需要去搞清楚含义
搜：
IP-SM-GW
The IP-SM-GW architecture as suggested by the 3GPP TS 23.204 [7]. | Download Scientific Diagram
【总结】
- IP-SM-GW=IP SM GW=IP-SM Gateway=IP Short-Messaging Gateway
- 一句话描述：一个用来实现SMS over IP的AS=Application Server
- 背景
- 希望通过IP发送SMS短信
- SMS over IP
- IP-SM-GW网络架构
- 2 IPSMGW sites
- IPSMGW – CS Fallback
- 作用：
- 概述
- The IP-SM-GW shall provide the protocol interworking for delivery of the short message between the IP-based UE and the SMS-SC
- The message is routed to the SMS-SC for delivery to the SMS-based user or the message is received from the SMS-SC of an SMS-based UE for delivery to an IP-based UE
- 包括
- to determine the domain (CS/PS or IMS) for delivery of a Short Message
- to connect to the SMS-GMSC using established MAP protocols, appearing to the SMS-GMSC as an MSC or SGSN using the E or Gd interfaces
- to respond to Send Routeing Information for Short Message requests made by the SMS-GMSC, and forwarded from the HSS, with its own address
- to connect to the SMS-IWMSC using established MAP protocols, appearing to the SMS-IWMSC as an MSC or SGSN using the E or Gd interfaces
- to connect to the HSS using established MAP protocols , to obtain the address of MSC/SGSN address(es) for SM termination in CS/PS
- to acquire and maintain knowledge of the association between the MSISDN, IMSI and the address of the S-CSCF serving of the user;
- to check that it has a valid address in SMS for the sender as well as the recipient when receiving an IMS message for an SMS user. The IP-SM-GW shall obtain a valid address for both from the SIP headers of the IMS message (e.g. the sender would be identified in the asserted id in form of TEL URI);
- for terminating procedures, to map the recipient’s address from an MSISDN/IMSI to TEL URI format when receiving an SMS for an IP-based UE, and then it is the responsibility of the IMS core to perform any further mapping towards a SIP URI as required;
- to act as an Application Server towards the IMS core;
- to perform domain selection to choose the appropriate domain to deliver a message to a recipient and to obtain the MSC and/or SGSN addresses from the HSS; and
- to manage flags indicating user availability for SMS termination in the HSS
- 架构
- Architecture for providing SMS over a generic IP-CAN
- 子模块
- IP-SM-GW stack
- IP-SM-GW Transport layer
- 相关
- Short Message delivery with Transport-Level interworking
- Sh Reference Point
- Sh for Failover
- 具体实现
- Sentinel
- SentinelIP-SM-GW in an LTE network
- GL
- Simulation of IP-SM-GW for SMS over IMS Network
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