Method and apparatus for idle handoff in a cellular system

Inactive Publication Date: 2001-08-23
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As described above, the prior art idle handoff method has some complexities owing to executing two step handoff process including (1) an inter-cell handoff and (2) an inter-frequency handoff within the new ce

Method used

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  • Method and apparatus for idle handoff in a cellular system
  • Method and apparatus for idle handoff in a cellular system
  • Method and apparatus for idle handoff in a cellular system

Examples

Experimental program
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Embodiment Construction

PILOT_PN 9 472 NGHBR_CONFIG 3 2 FREQ_INCL 1 1 NGHBR_BAND 0 OR 5 1 NGHBR_FREQ 0 OR 11 300

[0089] The PILOT_PN is an index of pilot pseudo-random noise offset used in a cellular system and the NGHBR_CONFIG, frequency configuration, indicates a state of a frequency assignment of the neighboring base station.

[0090] For example, if the value of the NGHBR_CONFIG is 000, the mobile telephone recognizes the number of the frequency assignments between the current base station and the neighboring base station and if the value is 010, the mobile telephone recognizes the number is different.

[0091] The FREQ_INCL, frequency indicator, indicates a frequency connected to the mobile telephone with the current base station is a dummy pilot signal in the neighboring base station.

[0092] The NGHBR_BAND and the NGHBR_FREQ indicate information on the frequency to be synchronized by the mobile telephone.

[0093] As illustrated in the above table, the current invention is capable to provide a method and an app...

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Abstract

Method and apparatus for an idle state handoff in a cellular system includes the steps of transmitting by a current base station to a mobile telephone information regarding a frequency assignment of the neighboring base stations and a list of the neighboring base stations. A pilot signal is detected from the neighboring base stations by the mobile telephone, and it is then determined whether the detected neighboring base station is included in the list of the neighboring base stations. If the detected neighboring base station is not included in the list, it recognized as a handoff failure. If the detected neighboring base station is included in the list of the neighboring base stations, a determination as to whether the detected pilot signal is a dummy pilot signal by referring to the frequency assignment information. A frequency corresponding to the neighboring base station must be determined if the pilot signal is a dummy signal in order to perform the idle state handoff. Detection of the paging channel from the decided handoff frequency is performed. An apparatus of the present invention includes a mobile telephone for detecting pilot signals of the neighboring base stations and for deciding the frequency for handoff by referencing a list of the neighboring base stations and the frequency assignment information supplied by the current base station. The mobile telephone is switched in an idle state from the current base station to a neighboring base station having a decided handoff frequency.

Description

CLAIM OF PRIORITY[0001] This application makes reference to, incorporates the same herein, and claims all benefits accruing under 35 U.S.C. .sctn. 119 arising from an application entitled, METHOD AND APPARATUS FOR IDLE HANDOFF IN A CELLULAR YSTEM, earlier filed in the Korean Industrial Property Office on Sep. 9, 1998, and there duly assigned Ser. No. 1998-36976.[0002] The current invention relates to a method for executing an idle handoff in a cellular system and an apparatus thereof. More particularly, a method for executing a hard handoff when a mobile telephone in an idle state moves between base stations having other frequency assignments (FA) in a conventional code division multiple access (CDMA) system and an apparatus thereof.DESCRIPTION OF THE RELATED ART[0003] In a cellular system, there are a plurality of cells within a service area, a plurality of base stations for controlling the cells, and a mobile switching center for controlling the base stations. When a mobile teleph...

Claims

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Application Information

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IPC IPC(8): H04B7/26H04W36/30
CPCH04W48/20H04W36/0061H04W36/0072H04W36/08H04W68/02
Inventor KIM, SANG-TAELIM, YOUNG-SIK
Owner SAMSUNG ELECTRONICS CO LTD
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