Handoff in radio telecommunications networks
First Claim
1. A method in a Packet Control Function (PCF) for participating in the set-up of a traffic path during mobile station (MS) handoff in a cdma2000 network, wherein the network further comprises a first Base Station Controller (BSC) that is a target BSC for the MS and a second Base Station Controller (BSC) that is a source BSC initiating a handoff for the MS, and a Packet Data Serving Node (PDSN), the method comprising the steps of:
- upon reception of an “
A9—
Set-up—
A8”
message from the target BSC, sending an A10 Connection Request to the PDSN; and
upon reception of a response from the PDSN, sending an “
A9 —
Connect—
A8”
message to the BSC,wherein the steps are performed in order to establish a connection for the MS between the target BSC and the PDSN while the MS has still a connection with the source BSC.
1 Assignment
0 Petitions
Accused Products
Abstract
The invention relates to an improved handoff method for mobile IP in a cdma2000 network. During handoff, the A10 connection between the Target PCF and the PDSN is pre-set-up, while the MS is still connected to a MSC, when the Target PCF receives the message from the Target BSC to set up the A8 connection. Furthermore, in the case of inter-PDSN handoff, a tunnel is established between the PDSNs, over which the PPP context eventually is transferred to the Target PDSN. The Target PDSN then sends a message to the MS triggering a re-registration with the HA. The Target PDSN takes over full responsibility for the MS when it receives the Mobile IP Result from the HA, and sends a message to the Serving PDSN to let the latter know that it can release all resources related to the MS.
50 Citations
23 Claims
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1. A method in a Packet Control Function (PCF) for participating in the set-up of a traffic path during mobile station (MS) handoff in a cdma2000 network, wherein the network further comprises a first Base Station Controller (BSC) that is a target BSC for the MS and a second Base Station Controller (BSC) that is a source BSC initiating a handoff for the MS, and a Packet Data Serving Node (PDSN), the method comprising the steps of:
-
upon reception of an “
A9—
Set-up—
A8”
message from the target BSC, sending an A10 Connection Request to the PDSN; andupon reception of a response from the PDSN, sending an “
A9 —
Connect—
A8”
message to the BSC,wherein the steps are performed in order to establish a connection for the MS between the target BSC and the PDSN while the MS has still a connection with the source BSC.
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2. A Packet Control Function (PCF) for participating in the set-up of a traffic path during mobile station (MS) handoff in a cdma2000 network, wherein the network further comprises a first Base Station Controller (BSC) that is a target BSC for the MS and a second Base Station Controller (BSC) that is a source BSC initiating a handoff for the MS, and a Packet Data Serving Node (PDSN), the PCF comprising:
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a reception unit for receiving; an “
A9—
Set-up—
A8”
message from the target BSC; andan A10 Connection Result message from the PDSN; a transmission unit for sending; an A10 Connection Request message to the PDSN; and an “
A9—
Connect—
A8”
message to the target BSC; anda computing unit, connected to the reception unit and the transmission unit, for; analysing received messages; and ordering the transmission of; the message to the PDSN in response to reception of the message from the target BSC; and the message to the target BSC in response to reception of the message from the PDSN, wherein the units are employed in order to establish for the MS a connection between the target BSC and the PDSN while the MS has still a connection with the source BSC.
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3. A method for setting up a traffic path during mobile station (MS) handoff in a cdma2000 network, wherein the network further comprises a target Base Station Controller (BSC), a Packet Control Function (PCF), and a Packet Data Serving Node (PDSN), wherein the MS is to hand off to the target BSC from a source Base Station Controller (BSC), the method comprising the steps of:
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sending an “
A9—
Set-up—
A8”
message from the target BSC to the PCF;upon reception of the “
A9—
Set-up—
A8”
message, sending an A10 Connection Request from the PCF to the PDSN;sending an A10 Connection Result from the PDSN to the PCF; and upon reception of the A10 Connection Result, sending an “
A9—
Connect—
A8”
message from the PCF to the target BSC,in order to establish for the MS a connection between the target BSC and the PDSN while the MS has still a connection with the source BSC. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10)
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11. A system for setting up a traffic path during mobile station (MS) handoff in a cdma2000 network, the network further comprising a target Base Station Controller (BSC), a Packet Control Function (PCF), and a Packet Data Serving Node (PDSN), wherein the MS is hand off to the target BSC from a source BSC and, wherein the system comprises:
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the target BSC for sending “
A9—
Set-up—
A8”
messages to the PCF and receiving “
A9—
Connect—
A8”
messages from the PCF;the PDSN for receiving A10 Connection Requests from the PCF and sending A10 Connection Results to the PCF; and the PCF for sending an A10 Connection Request to the PDSN upon reception of an “
A9—
Set-up—
A8”
message from the target BSC, and sending an “
A9—
Connect—
A8”
message to the target BSC upon reception of an A10 Connection Result from the PDSN,in order to establish for the MS a connection between the target BSC and the PDSN while the MS has still a connection with the source BSC. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A method for changing the routing of traffic to a mobile station (MS) in a cdma2000 network, the network further comprising a first and a second Packet Data Serving Node (PDSN) and a Home Agent (HA), wherein the HA has registered that data traffic for the MS is to be sent to the first PDSN for further routing to the MS, the MS is in the domain of the second PDSN, the MS and the first PDSN store Point-to-Point Protocol (PPP) context information and have a PPP connection, and there is a tunnel between the first and second PDSN through which data traffic received by the first PDSN for the MS is sent, the method comprising the steps of:
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transferring PPP context information relating to the MS from the first PDSN to the second PDSN; upon reception of all the necessary PPP context information, sending an Agent Advertisement from the second PDSN to the MS; sending a Mobile IP (MIP) Re-registration message from the MS to the HA; changing, upon reception of the MIP Re-registration message, by the HA the registration for the MS so that it indicates that data traffic for the MS should be sent to the second PDSN; sending a MIP Result message from the HA to the second PDSN to acknowledge the re-registration message; and establishing by the second PDSN a PPP connection to the MS using the stored PPP context information. - View Dependent Claims (19)
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20. A system for changing the routing of traffic to a mobile station (MS) in a cdma2000 network, the system comprising a first and a second Packet Data Serving Node (PDSN) and a Home Agent (HA), wherein the MS has handed off to the domain of the second PDSN, and the MS stores Point-to-Point Protocol (PPP) context information and has a PPP connection with the first PDSN, wherein:
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the HA is for; registering to which PDSN data traffic for the MS is to be sent for further routing to the MS; changing the registration for the MS upon reception of a Mobile IP (MIP) Re-registration message from the MS; and sending a MIP Result message to the second PDSN to acknowledge the Re-registration message; and the first PDSN is for; storing PPP context information; sending data traffic for the MS through a tunnel to the second PDSN; and transferring PPP context information relating to the MS to the second PDSN; and the second PDSN is for; receiving the PPP context information from the first PDSN; storing the PPP context information; sending an Agent Advertisement to the MS; forwarding a MIP Re-registration message from the MS to the HA; and establishing a PPP connection to the MS using the stored PPP context information. - View Dependent Claims (21)
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22. A Packet Data Serving Node (PDSN) in a cdma2000 network, wherein the network comprises a second PDSN storing Point-to-Point Protocol (PPP) context information relating to a Mobile Station (MS) that has handed off to the first PDSN, and a Home Agent (HA) that has registered that the MS is served by the second PDSN, the PDSN comprising:
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a reception unit for receiving; the PPP context information from the second PDSN; and a Mobile IP (MIP) Re-registration message from the MS; a memory for storing the PPP context information; a transmission unit for; sending an Agent Advertisement to the MS; and forwarding the MIP Re-registration message to the HA; and a connection establishment unit for establishing a PPP connection to the MS using the stored PPP context information. - View Dependent Claims (23)
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Specification