Handover properties estimation system, methods thereof, and storage medium

• US 8,725,154 B2
• Filed: 12/27/2011
• Issued: 05/13/2014
• Est. Priority Date: 12/28/2010
• Status: Expired due to Fees

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Sugahara, Hiroto, Kobayashi, Kosei
• Primary Examiner(s): SHAHEED, KHALID W
• Application Number:
  US13/337,780
• Publication Number:
  US 20120165024A1
• Time in Patent Office: 868 Days
• Field of Search: 455/436, 455/437, 455/438, 455/439, 455/440, 455/441, 455/442, 455/443
• US Class Current: 455/440
• CPC Class Codes: H04W 36/008375 based on historical data

Abstract

A handover properties estimation system includes a moving-route extraction unit which extracts moving routes which pass through a handover area or a neighboring area by using map information of the handover area and the neighboring area. The handover area is an area in which a handover process occurs between cells in a mobile communication system. The system further includes a moving-route handover properties calculation unit for calculating handover properties of the moving routes extracted by the moving-route extraction unit, by using radio-wave environment information of the moving routes.

Claims

1. A handover properties estimation system for estimating handover properties in a mobile communication system, the system comprising:

a moving-route extraction unit which extracts moving routes that pass through a handover area or an area neighboring the handover area, wherein the handover area is defined as an area in which a handover process occurs between cells in the mobile communication system, and wherein the moving routes are extracted from map information of the handover area or the neighboring area; and

a moving-route handover properties calculation unit which calculates handover properties for moving routes extracted by the moving-route extraction unit, by use of radio-wave environment information of the moving routes,

wherein the moving-route handover properties calculation unit calculates the handover properties on the moving routes based on a received-signal quality obtained when a mobile terminal of the mobile communication system travels along the moving routes, and

wherein the moving-route handover properties calculation unit calculates the received-signal quality and adds an effect of a radio-wave fluctuation in the mobile terminal to the calculated received-signal quality.

2. The handover properties estimation system according to claim 1 further comprising:

a cell-to-cell handover properties calculation unit which calculates handover properties between cells by combining two or more handover properties calculated by the moving-route handover properties calculation unit.

3. The handover properties estimation system according to claim 1, wherein:

the moving-route handover properties calculation unit calculates, a probability that a handover process starts, based on the received-signal quality thus calculated, and when the handover process starts, the moving-route handover properties calculation unit calculates a probability that the handover process is finished normally, thereby calculating the handover properties on the moving route by use of the handover-process starting probability thus calculated and the handover-process normal-end probability thus calculated.

4. The handover properties estimation system according to claim 1, wherein the moving-route handover properties calculation unit calculates a received-signal quality and adds a random number to the calculated received-signal quality, performs a process of simulating a system operation based on the received-signal quality to which the random number has been added, and repeats the process of adding a new random number to the calculated received-signal quality and simulating the system operation based on the received signal-quality to which the new random number is added.

5. The handover properties estimation system according to claim 1, wherein the handover area comprises a set of locations that will be trigger a handover between cells in the mobile communication system.

6. The handover properties estimation system according to claim 1, wherein the moving route comprises a plurality of road segments.

7. The handover properties estimation system according to claim 6, wherein the moving route comprises one of a line segment which connects a first location within a building to a second location in a building or a line segment which connects a location within a building to an outdoor road segment.

10. The handover properties estimation system according to claim 1, further comprising:

a cell-to-cell handover properties calculating unit which calculates handover properties between cells by combining the handover properties on the moving routes calculated by the moving-route handover properties calculation unit; and

a handover-parameter deriving unit which derives a handover parameter which achieves a best handover property based on the calculated handover properties between the cells.

8. A handover properties estimation method for estimating handover properties in a mobile communication system, the method comprising:

extracting moving routes which pass through a handover area or an area neighboring the handover area, wherein the handover area is defined as an area in which a handover process occurs between cells in the mobile communication system, and wherein the moving routes are extracted from map information of the handover area or the neighboring area; and

calculating handover properties of the moving routes thus extracted, by using radio-wave environment information for the moving routes,

wherein the handover properties on the moving routes are calculated based on a received-signal quality obtained when a mobile terminal of the mobile communication system travels along the moving routes; and

wherein an effect of a radio-wave fluctuation in the mobile terminal is added to the calculated received-signal quality.

11. The handover properties estimation method according to claim 8, further comprising:

calculating handover properties between the cells by combining a plurality of the calculated handover properties; and

deriving a handover parameter which achieves a best handover property, based on the calculated handover properties between the cells.

9. A non-transitory computer readable information recording medium storing a program which, when executed by a processor, performs a method comprising:

extracting moving routes which pass through a handover area or an area neighboring the handover area, wherein the handover area is defined as an area in which a handover process occurs between cells in the mobile communication system, and wherein the moving routes are extracted from map information of the handover area or the neighboring area; and

calculating handover properties of the moving routes thus extracted, by using radio-wave environment information for the moving routes,

wherein the handover properties on the moving routes are calculated based on a received-signal quality obtained when a mobile terminal of the mobile communication system travels along the moving routes; and

wherein an effect of a radio-wave fluctuation in the mobile terminal is added to the calculated received-signal quality.

12. The non-transitory computer readable information recording medium according to claim 9, wherein the method further comprises:

calculating handover properties between the cells by combining a plurality of the calculated handover properties; and

deriving a handover parameter which achieves a best handover property, based on the calculated handover properties between the cells.