The question asks about the types of end-to-end packet-switched data transfer services provided by GPRS. Let's look at the options: Point to point (I) and Point to multipoint (II).

Understanding GPRS Packet Data Services

GPRS stands for General Packet Radio Service. It's a mobile data service that allows users to send and receive data over a mobile network (typically GSM). Unlike older circuit-switched services where a dedicated line is established for the duration of a call or data session, GPRS uses packet switching. This means data is broken down into small packets, each routed independently over the network, sharing network resources with other users. This makes GPRS more efficient for bursty data traffic like internet browsing or email.

GPRS Point-to-Point (PTP) Services

Point-to-Point data transfer involves communication between two specific points: a mobile device and another entity on a network (like a server on the internet or a private network). This is the most common type of data service used with GPRS. Examples include:

• Accessing the internet
• Sending and receiving emails
• Transferring files
• Using mobile applications that require data exchange

GPRS provides a mechanism for setting up a packet data connection between the mobile device and a Packet Data Network (PDN), often via a Gateway GPRS Support Node (GGSN).

GPRS Point-to-Multipoint (PTM) Services

Point-to-Multipoint data transfer involves sending data from a single source to multiple destinations simultaneously. In the context of GPRS, this capability is associated with broadcasting information to a group of users. While Point-to-Point services are fundamental and widely implemented in GPRS, Point-to-Multipoint services were part of the GPRS specifications, although their implementation and widespread use were less common compared to PTP.

Point-to-Multipoint services in GPRS can be categorized into:

• Point-to-Multipoint Multicast: Data is sent to a defined group of subscribers who have registered to receive the broadcast.
• Point-to-Multipoint Broadcast: Data is sent to all subscribers within a specific geographic area, regardless of whether they have registered for the service.

These services are useful for applications like transmitting news headlines, traffic updates, or weather information to multiple users at once.

Conclusion on GPRS Services

GPRS is designed to provide packet-switched data services. Based on its technical specifications and capabilities, GPRS supports both Point-to-Point and Point-to-Multipoint modes of data transfer. Therefore, GPRS provides end-to-end packet switched data transfer service for both Point-to-Point and Point-to-Multipoint communication.

Considering the functionalities defined for GPRS, it supports both types of packet-switched data transfer.

Revision Table: GPRS Fundamentals

Additional Information: Packet Switching vs. Circuit Switching

It's helpful to understand the difference between packet switching and circuit switching, as GPRS is a key example of packet switching in mobile networks.

• Circuit Switching: A dedicated communication path (circuit) is established between the sender and receiver for the entire duration of the call or session. Resources are reserved even when no data is being sent. This is used for traditional voice calls (in GSM).
• Packet Switching: Data is broken into packets. Each packet may take a different route. Network resources are shared among many users. This is efficient for data that comes in bursts, like web browsing. GPRS uses packet switching, which is why you are typically charged based on the amount of data transferred, not the connection time.

GPRS introduced packet switching to GSM networks, paving the way for more efficient and 'always-on' mobile data connectivity compared to older Circuit Switched Data (CSD) services.