Handover method in next generation mobile communication system

• US 7,174,166 B2
• Filed: 09/25/2003
• Issued: 02/06/2007
• Est. Priority Date: 12/24/2002
• Status: Expired due to Fees

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Song, Jae-Su, Chang, Sung-Cheol, Kim, Ju-Hee
• Primary Examiner(s): Mehrpour; Naghmeh
• Application Number:
  US10/672,694
• Publication Number:
  US 20040121771A1
• Time in Patent Office: 1,230 Days
• Field of Search: 455/436, 455/435, 455/432.1, 455/406, 455/407, 455/408, 455/437, 455/438, 455/439, 455/456.5, 455/456.6, 455/405, 370/331
• US Class Current: 455/436
• CPC Class Codes: H04W 36/0011 for data sessions of end-to-end connection
• CPC Class Codes: H04W 8/02 Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
• CPC Class Codes: H04W 8/087 for preserving data network PoA address despite hand-offs
• CPC Class Codes: H04W 80/04 Network layer protocols, e.g. mobile IP [Internet Protocol]

Abstract

Disclosed is a handover method in a next-generation mobile communication system. When a terminal is in the idle state, an IP is reallocated according to a process of mobile IPs to perform a location registration process, and when the terminal is in the active state, it operates according to a procedure of a mobile communication network. Therefore, the terminal operates in two modes to support mobility on the IP-based networks, and it performs a handover procedure by configuring a layer below the MAC to a new AS without allocating the IP at the handover state when it is in the active state to thus minimize handover delay time.

Claims

1. A handover method for mobility of a terminal in a mobile communication system, comprising:

(a) performing IP (Internet protocol) acquisition through an IP registration process according to a mobile IP when a terminal in an idle state moves to a new cell; and

(b) transmitting traffic to a new moving AS (access station) from a previous AS without performing an IP modification and registration process when the mobile terminal in an active state moves to a new cell,

the step (b) comprising;

receiving a channel state measurement report message from the mobile terminal;

a control AS determining a handover to set a radio link at a drift AS, and reconfigure an RLC (radio link control) layer at a serving AS;

transmitting an active set update message to the mobile terminal; and

starting traffic access to the drift AS.

2. The method of claim 1, wherein when the terminal is in the active state in (b), data traffic transmitted through a radio link following an IP/RLC/MAC/physical layer preset in a serving AS is switched to a MAC/physical layer of a drift AS through the drift AS.

3. The method of claim 2, wherein when the terminal is in the active state, data lost while generating the link moving to the terminal from the serving AS through the drift AS at a time of generation of handover are retransmitted using a retransmission function in the RIG layer when the handover is finished.

4. The method of claim 1, wherein the terminal operates according to a procedure of the mobile IP when the terminal is in the idle state, and it operates according to a mobile communication network procedure when it is in the active state.