Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2000-02-09
2004-07-20
Vu, Huy D. (Department: 2665)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C360S328000, C360S327300, C360S327300, C360S327300, C360S327300, C360S327300, C455S422100, C455S432100, C455S433000, C455S436000, C455S437000, C455S442000
Reexamination Certificate
active
06766168
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a packet data service network in a mobile radio communication network. In particular, the present invention relates to a packet data service network for a mobile station and a method of operating a packet data service using the packet data service network.
2. Background of the Related Art
In order to provide a packet data service in a mobile radio communication network based on IS-95 series a protocol function should be first provided to each network element which constitutes the mobile radio communication network as shown in FIG.
1
. Specifically, a radio link protocol (RLP) of a radio section, a packet transmission link of an infrastructure section, and a frame relay link of a section between an interworking function device (IWF) and a base station controller/mobile switching center are respectively provided as a lower layer relay for transferring point-to-point protocol (PPP) link data between a mobile station (MS) and the IWF, while an Internet protocol (IP) network layer is provided as an upper layer of the PPP link.
A packet service procedure as shown in
FIG. 2
should be performed to provide an Internet packet service to a certain mobile station (MS) using the above-described protocols.
Referring to
FIG. 2
, at step al, a mobile station (MS) is identified by and connected to a radio access network (RAN). At this time, dedicated resources between the MS and the RAN and between RAN and the IWF are adjusted.
At step b
1
, a PPP link between the MS and the IWF is determined using PPP LCP.
At step c
1
, the MS instructs the IWF to determine a permanent home address using PPP IPCP.
At step d
1
, the IWF/FA transmits an agent advertisement message and a care of address (COA) of an external agent to the MS using a mobile IP (MIP). At this time, the MS transmits an agent solicitation message to a foreign agent (FA), or responds to the FA with its agent advertisement reply.
At step e
1
, the MS determines whether the COA of the external agent is new or not. If the COA is new, the MS sends a registration request message to the FA to initialize a mobile IP registration. At this time, such a registration request message includes the home address of the MS, the home agent (HA) address, the address of the FA, and information on an identification extension between the MS and the HA.
At step f
1
, the FA sends an identification request message to the HA.
At step g
1
, the HA confirms the identification extension between MS and HA when FA receives the registration request message. At this time, if the identification of the MS is completed, the HA includes the home address of the MS in the COA of the FA and sends an identification reply to the FA. If the identification of the MS fails, or the HA rejects the registration request for a certain reason, the HA transfers the registration reply message to the FA, which indicates the reason of rejection.
At step h
1
, if the registration reply indicates that the HA accepts the registration request, the FA adds the home address of the MS and the registration lifetime to an FA visitor list, and then sends the registration reply to the MS.
At step i
1
, if the mobile IP registration is successfully performed, the MS may send the packets to the Internet to transmit the packets to a destination. The packets of the originating MS are sent to the IWF through the PPP link.
At step j
1
, the FA may route the packets of the terminating MS to the Internet, or send the packets directly to the HA.
At step k
1
, the packets of the terminal MS are routed to the HA.
At step l
1
, the HA sends the packets of the terminating MS directly to FA.
At step m
1
, the FA removes a tunnel overhead, and sends the packets of the terminating MS to the MS through the PPP link.
Specifically, as shown in
FIG. 2
, the mobile station is allocated with the Internet IP address to have the Internet packet service. This IP address is allocated as a temporary address or care of address (COA) during the set-up of the PPP link by the IWF, which matches the communication protocol so that the MS is connected to the existing wired network.
The IP address used by the MS is always related to IWF, and thus if the connection between the MS and the IWF, which is connected to the PPP link is cut off, the software of the upper layer should be directed to use a new IP address.
Accordingly, in order for the MS to perform a seamless Internet packet data communication, the mobile IP function of supporting the mobility of the IP address should allow for the continuous use of the IP address even though the MS deviates from the service area of the IWF. For the effective support of the mobility of the IP address, the area of the radio base station is divided into packet zones, and each specified IWF provides the service for each specified packet zone. At this time, the base station provides a lower function that the base station broadcasts a packet zone identifier as a system message so that the MS can identify its packet zone.
For instance, the MS, which is served with the mobile IP service by the mobile client software, receives the packet zone related information broadcasted from the system, and compares the information with a packet zone identifier stored therein.
If the two packet zone identifiers are different from each other as a result of comparison, the MS deviates from the IWF area to which the MS has connected, connects with a new IWF, and then sends the solicitation message to the IWF connected to the FA. The MS receives the FA advertisement information provided by the IWF as a reply message, and performs the mobile IP registration if the message indicates a new FA.
As a result, the mobile IP terminal can perform the Internet packet service continuously with its own IP address.
However, whenever the MS moves from a first packet zone to another packet zone to effect the mobile IP registration, it takes a lot of time to set up a new PPP link.
Also, since the MS should pass the FA solicitation procedure, the FA advertisement procedure, and the mobile IP registration procedure, a seamless handoff of the MS cannot be actually achieved. Accordingly, the MS may lose many packets that it has from the time when the MS moves to another packet zone to the time when the MS completes a new mobile IP registration.
Also, if a simple IP terminal having no mobile client software changes its packet zone, the currently used IP can no longer be used, and the upper application service layer should be completely restarted.
The above references are incorporated by reference herein where appropriate for appropriate teachings of additional or alternative details, features and/or technical background.
SUMMARY OF THE INVENTION
An object of the invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages described hereinafter.
An object of the present invention is to provide a packet data service network in a mobile radio communication network and a method of operating a packet data service that substantially obviates one or more of the problems caused by the disadvantages of the related art.
Another object of the present invention is to provide a packet data service network in a mobile radio communication network and a method of operating a packet data service using the packet data service network which can maintain the PPP link of a mobile station and an interworking function device (SIWF) based on the relationship between an interworking function device (AIWF) for performing a relay link connection for connecting the mobile station and the interworking function device in a new area and the interworking function device (SIWF) which maintains the PPP link before the movement of MS in case that the mobile station deviates from a determined area while the mobile station is being served with the packet data service in the environment of a mobile radio communication network of cellular/PCS/IMT-2000.
Another object of the present invention is to provide a protocol operating
Fleshner & Kim LLP
LG Information & Communications Ltd.
Volper Thomas E.
Vu Huy D.
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