Method and apparatus for assigning IP address in mobile communication network

Patent metadata

Field	Value
Publication number	US-9338702-B2
Application number	US-201414268897-A
Country	US
Kind code	B2
Filing date	May 2, 2014
Priority date	May 3, 2013
Publication date	May 10, 2016
Grant date	May 10, 2016

Abstract

When a Mobile Node (MN) is assigned IP addresses, the number of which is greater than or equal to the preset number of IP addresses that the MN is capable of being assigned with, the MN identifies information on the pre-emption vulnerability of each session associated with an IP address, and releases an IP address which enables a disconnection of a session. When there are multiple IP addresses associated with the pre-emptable sessions, a consideration is given to multiple conditions related to which IP address is to be selected, one IP address is selected, and the relevant IP address is released. When any IP address cannot be released, a new session is associated with an IP address which can give the smallest overhead to the MN and the network among the existing IP addresses, so that an IP address can be efficiently assigned.

First claim

What is claimed is:

1. A method for associating an internet protocol (IP) address with a session by a terminal in a mobile communication network, the method comprising:
determining whether a new session with a corresponding terminal is a first session associated with an IP address assigned by a base station (BS), if the terminal attempts to connect the new session with the corresponding terminal;
comparing a total number of IP addresses that the terminal has been assigned with a preset number of IP addresses that the terminal is capable of being assigned with, if the new session is the first session;
associating the new session with one of the IP addresses assigned by the BS, if the total number of IP addresses is less than the preset number of IP addresses; and
associating the new session with a IP address selected by the BS, if the total number of IP addresses exceeds the preset number of IP addresses.

2. The method as claimed in claim 1 , further comprising:
updating a table including information on the preset number of IP addresses and information on the total number of IP addresses based on a result of the associating.

3. A method for assigning an internet protocol (IP) address to a terminal by a base station in a mobile communication network, the method comprising:
receiving an IP resolution request for a new session from the terminal;
identifying IP addresses associated with pre-emptable sessions among IP addresses assigning to the terminal, by scanning information of the terminal based on the IP resolution request;
releasing the identified IP addresses and associating the new session with a new IP address by assigning the new IP address to the terminal, if it is identified that there exists the IP address associated with the pre-emptable sessions; and
associating the new session with one of the IP addresses assigning to the terminal if it is identified that there exists no IP address associated with the pre-emptable sessions.

4. The method as claimed in claim 3 , wherein the IP resolution request is received from the terminal, based on a result of comparing a total number of IP addresses assigning to the terminal, with a preset number of IP addresses that the terminal is capable of being assigned with.

5. The method as claimed in claim 4 , wherein the IP resolution request is received from the terminal if the total number of IP addresses exceeds the preset number of IP addresses.

6. The method as claimed in claim 3 , wherein the identifying of the IP addresses associated with the pre-emptable sessions comprises identifying an IP address having a lowest priority among multiple IP addresses if there exist the multiple IP addresses associated with the pre-emptable sessions.

7. The method as claimed in claim 6 , wherein the IP address having the lowest priority (IP priority) is calculated based on an IP priority resolution function,
wherein the IP priority resolution function is defined by

IP
⁢

⁢
Priority

=

α
⁢

⁢

N
session

+

β
⁢

⁢

Time

IP
assigned

+

∑

N
session

⁢

(

γ
⁢

⁢

Activity
session

+

δ
⁡

(

1

Priority
ARP

)

+

ɛ
⁢

⁢
QCI

)

,

wherein α, β, γ, δ and ε represent weights, N session represents the number of sessions established by using a relevant IP address, Time IP _ assigned represents a time point of assigning the relevant IP address, Activity session represents traffic of packets transmitted per second during a relevant session, QCI represents a quality of service class indication, and Priority ARP represents allocation and retention priority (ARP) of the relevant session.

8. The method as claimed in claim 3 , wherein the one of the IP addresses assigning to the terminal is selected based on an IP associating function, if it is identified that there exists no IP address associated with the pre-emptable sessions,
wherein the IP associating function is defined by

Associating
⁢

⁢
IP

=

α
⁡

(

1

N
session

)

+

β
⁢

⁢

TIME

IP
assigned

+

∑

⁢

Assignees

• Samsung Electronics Co Ltd
• Samsung Electronics Co Ltd

Inventors

• Kweon Ki-Suk
• Park Jung-Shin
• Son Yeong-Moon
• Franklin Antony

Classifications

• H04L61/5076

  Update or notification mechanisms, e.g. DynDNS · CPC title

• H04L61/5007

  Internet protocol [IP] addresses · CPC title

• H04W36/00222

  between different packet switched [PS] network technologies, e.g. transferring data sessions between LTE and WLAN or LTE and 5G · CPC title

• H04W36/1443

  between licensed networks · CPC title

• H04L61/2007

  Electricity · mapped topic