System and method for packet data servicing node (PDSN) initial assignment and reselection

a packet data and initial assignment technology, applied in data switching networks, multiplex communication, assess restrictions, etc., can solve the problem that the packet data link between the ms and the pdsn, once initially selected, may become dorman

Inactive Publication Date: 2005-02-03
CHEN NING NICHOLAS +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, the packet data link between the MS and PDSN, once initially selected, may become dormant as the MS ceases to communicate packet data.

Method used

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  • System and method for packet data servicing node (PDSN) initial assignment and reselection
  • System and method for packet data servicing node (PDSN) initial assignment and reselection
  • System and method for packet data servicing node (PDSN) initial assignment and reselection

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Embodiment Construction

In short, the heart of the invention is a methodology embodied in a set of machine executable instructions. Typically, the instructions are written in a medium which can be accessed as memory by a computer, or which can be read by a computer. The set of instructions are typically embodied as a computer application which orders the computer microprocessor to perform the series of steps needed to cause a PCF to select a PDSN in accordance with the algorithm described in detail below.

A PDSN table must be configured at PCF. Each PCF maintains a table that includes all PDSNs it is connected to. Each table entry must contain (but is not limited to) a PDSN identification (Id) number, and an IP Address associated with the PDSN. It is important that the PDSN Id numbers are assigned consistently, stored in a predetermined ordered sequence (ascending or descending) in all PCFs. An example of such a table, such as might be configured in a PCF is shown below (Table 1).

TABLE 1PDSN NumberIP A...

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Abstract

An method for PDSN (Packet Data Serving Node) initial assignment and re-selection in a wireless communication system is provided. The method is implemented in PCF (Packet Control Function) within a third-generation (3G) CDMA Radio Access Network (RAN). The methodology reduces the number of point-to-point (PPP) re-establishments, when a Mobile Station (MS) roams to a different packet zone/PCF. The method generates a table of PDSN identification numbers cross-referenced to the PDSN Internet protocol (IP) addresses, residing with each PCF. A PDSN Id number is selected from the table using the MS IMSI (International Mobile Station Identifier) as a key to perform the selection. The present invention methodology addresses the issue of forward and backward compatibility, scalability, reliability, and load sharing in the PDSN selection.

Description

BACKGROUND OF THE INVENTION This invention generally concerns wireless communications and, more particularly, a system and method for assigning a Packet Data Serving Node (PDSN) to a wireless mobile station (MS), to provide packet data services in a third-generation (3G) code division multiple access (CDMA) communication system. In the second generation CDMA systems specified by the IS-95B standard, uplink data bursts from a MS to base station are limited to a small number of frames, typically 8 or less. The data rate is limited to 4.8 kbps, i.e., inferior to the one used by the users active on the dedicated (voice) channels, which is 9.6 or 14.4 kilobits per second (kbps). The 3G CDMA, as described in IS-2000 body of standards, is being designed to accommodate both longer messages (more frames per message) and higher data rates to support the communication packetized data. Data rates of 384 kbps are envisioned. The ability of the 3G CDMA to communicate packet data will permit use...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04L12/56H04L29/06H04L29/08H04L29/12H04W8/26H04W36/00H04W48/16H04W84/04
CPCH04L29/06H04L29/12018H04L29/12311H04L29/1232H04L61/10H04L61/2015H04L67/1019H04L61/2092H04W8/26H04W48/16H04W84/04H04L67/1006H04L61/2084H04L61/5092H04L61/5084H04L61/5014H04L9/40
Inventor CHEN, NING NICHOLASBASILIER, HENRIKJULKA, VIBHORGUSTAVSSON, ROGER
Owner CHEN NING NICHOLAS
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