System and method for packet data servicing node (PDSN)initial assignment and reselection
First Claim
1. In a wireless communication system including at least one Packet Control Function (PCF) and at least two Packet Data Servicing Nodes (PDSNs), a method for selecting a PDSN for packet data communications with a first mobile station (MS), the method comprising:
- generating a record of unique PDSN Id numbers at the at least one PCF communicatively coupled between the first mobile station and the at least two PDSNs; and
assigning a unique MS identification number (Id) to the first mobile station; and
selecting a PDSN in response to the number of PDSN Id numbers in the record and to the first MS Id.
1 Assignment
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Accused Products
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.
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Citations
26 Claims
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1. In a wireless communication system including at least one Packet Control Function (PCF) and at least two Packet Data Servicing Nodes (PDSNs), a method for selecting a PDSN for packet data communications with a first mobile station (MS), the method comprising:
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generating a record of unique PDSN Id numbers at the at least one PCF communicatively coupled between the first mobile station and the at least two PDSNs; and assigning a unique MS identification number (Id) to the first mobile station; and selecting a PDSN in response to the number of PDSN Id numbers in the record and to the first MS Id. - View Dependent Claims (2, 3, 4, 5)
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6. In a wireless communication system including a plurality of m Packet Control Functions (PCFs) and a plurality of n Packet Data Servicing Nodes (PDSNs) with unique Internet protocol (IP) addresses, a method for selecting a PDSN for packet data communications with a first mobile station (MS), the method comprising:
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at each PCF, generating a record of PDSN Id numbers, wherein said each PCF is communicatively coupled between the first mobile station and one of the PDSNs; assigning a unique MS identification number (Id) to the first MS; and selecting a first PDSN Id number in response to the first MS Id. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A wireless communication system for communicating packet data, the system comprising:
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a first mobile station (MS) having a unique identification number (Id), the first MS having a transceiver for wireless packet data communications; a plurality of m Packet Control Functions (PCFs), each PCF having a port for packet data communications with MSs and a port for packet data communications with an Internet protocol (IP) address; a plurality of n Packet Data Servicing Nodes (PDSNs), each PDSN having a port for packet data communications with PCFs, a unique IP address and a unique identification (Id) number, wherein each PCF is communicatively coupled between the first mobile station and one of the PDSNs; in which each PCF includes a table with an ordered sequence of the n PDSN Id numbers cross-referenced with the IP addresses; and in which each PCF selects a first PDSN Id number for packet data communications with the first MS in response to the first MS Id. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26)
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Specification