A GSN is a arrangement bulge which supports the use of GPRS in the GSM amount network. All GSNs should accept a Gn interface and abutment the GPRS tunneling protocol. There are two key variants of the GSN, namely Aperture and Confined GPRS Abutment Node.
edit Aperture GPRS Abutment Bulge (GGSN)
The Aperture GPRS Abutment Bulge (GGSN) is a capital basic of the GPRS network. The GGSN is amenable for the interworking amid the GPRS arrangement and alien packet switched networks, like the Internet and X.25 networks.
From an alien network's point of view, the GGSN is a router to a sub-network, because the GGSN ‘hides’ the GPRS basement from the alien network. When the GGSN receives abstracts addressed to a specific user, it checks if the user is active. If it is, the GGSN assiduously the abstracts to the SGSN confined the adaptable user, but if the adaptable user is inactive, the abstracts is discarded. On the added hand, mobile-originated packets are baffled to the adapted arrangement by the GGSN.
The GGSN is the ballast point that enables the advancement of the user terminal in the GPRS/UMTS networks. In essence, it carries out the role in GPRS agnate to the Home Agent in Adaptable IP. It maintains acquisition all-important to adit the Agreement Abstracts Units (PDUs) to the SGSN that casework a accurate MS (Mobile Station).
The GGSN converts the GPRS packets advancing from the SGSN into the adapted packet abstracts agreement (PDP) architecture (e.g., IP or X.25) and sends them out on the agnate packet abstracts network. In the added direction, PDP addresses of admission abstracts packets are adapted to the GSM abode of the destination user. The readdressed packets are beatific to the amenable SGSN. For this purpose, the GGSN food the accepted SGSN abode of the user and his or her contour in its breadth register. The GGSN is amenable for IP abode appointment and is the absence router for the affiliated user accessories (UE). The GGSN aswell performs affidavit and charging functions.
Other functions cover subscriber screening, IP Pool administration and abode mapping, QoS and PDP ambience enforcement.
With LTE book the GGSN functionality moves to SAE aperture (with SGSN functionality alive in MME).
edit Confined GPRS Abutment Bulge (SGSN)
A Confined GPRS Abutment Bulge (SGSN) is amenable for the supply of abstracts packets from and to the adaptable stations aural its bounded account area. Its tasks cover packet acquisition and transfer, advancement administration (attach/detach and breadth management), analytic hotlink management, and affidavit and charging functions. The breadth annals of the SGSN food breadth advice (e.g., accepted cell, accepted VLR) and user profiles (e.g., IMSI, address(es) acclimated in the packet abstracts network) of all GPRS users registered with this SGSN....
edit Common SGSN Functions
Detunnel GTP packets from the GGSN (downlink)
Adit IP packets against the GGSN (uplink)
Carry out advancement administration as Standby approach adaptable moves from one Acquisition Breadth to addition Acquisition Area
Billing user data
edit GSM/EDGE specific SGSN functions
Enhanced Abstracts Rates for GSM Evolution (EDGE) specific SGSN functions and characteristics are:
Maximum abstracts amount of approx. 60 kbit/s (150 kbit/s for EDGE) per subscriber
Connect via anatomy broadcast or IP to the Packet Control Unit application the Gb agreement stack
Accept uplink abstracts to anatomy IP packets
Encrypt down-link data, break up-link data
Carry out advancement administration to the akin of a corpuscle for affiliated approach mobiles
edit WCDMA specific SGSN functions
Carry up to about 42 Mbit/s cartage downlink and 5.8 Mbit/s cartage uplink (HSPA+)
Tunnel/detunnel downlink/uplink packets against the radio arrangement ambassador (RNC)
Carry out advancement administration to the akin of an RNC for affiliated approach mobiles
These differences in functionality accept led some manufacturers to actualize specialist SGSNs for anniversary of WCDMA and GSM which do not abutment the added networks, whilst added manufacturers accept succeeded in creating both together, but with a achievement amount due to the compromises required.
edit Aperture GPRS Abutment Bulge (GGSN)
The Aperture GPRS Abutment Bulge (GGSN) is a capital basic of the GPRS network. The GGSN is amenable for the interworking amid the GPRS arrangement and alien packet switched networks, like the Internet and X.25 networks.
From an alien network's point of view, the GGSN is a router to a sub-network, because the GGSN ‘hides’ the GPRS basement from the alien network. When the GGSN receives abstracts addressed to a specific user, it checks if the user is active. If it is, the GGSN assiduously the abstracts to the SGSN confined the adaptable user, but if the adaptable user is inactive, the abstracts is discarded. On the added hand, mobile-originated packets are baffled to the adapted arrangement by the GGSN.
The GGSN is the ballast point that enables the advancement of the user terminal in the GPRS/UMTS networks. In essence, it carries out the role in GPRS agnate to the Home Agent in Adaptable IP. It maintains acquisition all-important to adit the Agreement Abstracts Units (PDUs) to the SGSN that casework a accurate MS (Mobile Station).
The GGSN converts the GPRS packets advancing from the SGSN into the adapted packet abstracts agreement (PDP) architecture (e.g., IP or X.25) and sends them out on the agnate packet abstracts network. In the added direction, PDP addresses of admission abstracts packets are adapted to the GSM abode of the destination user. The readdressed packets are beatific to the amenable SGSN. For this purpose, the GGSN food the accepted SGSN abode of the user and his or her contour in its breadth register. The GGSN is amenable for IP abode appointment and is the absence router for the affiliated user accessories (UE). The GGSN aswell performs affidavit and charging functions.
Other functions cover subscriber screening, IP Pool administration and abode mapping, QoS and PDP ambience enforcement.
With LTE book the GGSN functionality moves to SAE aperture (with SGSN functionality alive in MME).
edit Confined GPRS Abutment Bulge (SGSN)
A Confined GPRS Abutment Bulge (SGSN) is amenable for the supply of abstracts packets from and to the adaptable stations aural its bounded account area. Its tasks cover packet acquisition and transfer, advancement administration (attach/detach and breadth management), analytic hotlink management, and affidavit and charging functions. The breadth annals of the SGSN food breadth advice (e.g., accepted cell, accepted VLR) and user profiles (e.g., IMSI, address(es) acclimated in the packet abstracts network) of all GPRS users registered with this SGSN....
edit Common SGSN Functions
Detunnel GTP packets from the GGSN (downlink)
Adit IP packets against the GGSN (uplink)
Carry out advancement administration as Standby approach adaptable moves from one Acquisition Breadth to addition Acquisition Area
Billing user data
edit GSM/EDGE specific SGSN functions
Enhanced Abstracts Rates for GSM Evolution (EDGE) specific SGSN functions and characteristics are:
Maximum abstracts amount of approx. 60 kbit/s (150 kbit/s for EDGE) per subscriber
Connect via anatomy broadcast or IP to the Packet Control Unit application the Gb agreement stack
Accept uplink abstracts to anatomy IP packets
Encrypt down-link data, break up-link data
Carry out advancement administration to the akin of a corpuscle for affiliated approach mobiles
edit WCDMA specific SGSN functions
Carry up to about 42 Mbit/s cartage downlink and 5.8 Mbit/s cartage uplink (HSPA+)
Tunnel/detunnel downlink/uplink packets against the radio arrangement ambassador (RNC)
Carry out advancement administration to the akin of an RNC for affiliated approach mobiles
These differences in functionality accept led some manufacturers to actualize specialist SGSNs for anniversary of WCDMA and GSM which do not abutment the added networks, whilst added manufacturers accept succeeded in creating both together, but with a achievement amount due to the compromises required.
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