Arrangement method of the distributed repeater and system thereof

• US 8,380,123 B2
• Filed: 12/29/2008
• Issued: 02/19/2013
• Est. Priority Date: 01/09/2008
• Status: Active Grant

• Current Assignee: KT Corporation
• Original Assignee: KT Corporation
• Inventors: Jang, Jae Seon
• Primary Examiner(s): Pan, Yuwen
• Assistant Examiner(s): Wang, Fanghwa
• Application Number:
  US12/812,445
• Publication Number:
  US 20100317285A1
• Time in Patent Office: 1,513 Days
• Field of Search: None
• US Class Current: 455/7
• CPC Class Codes: H04B 7/155 Ground-based stations H04B7/204 takes precedence
• CPC Class Codes: H04B 7/2606 Arrangements for base station coverage control, e.g. by using relays in tunnels
• CPC Class Codes: H04W 16/26 Cell enhancers or enhancement, e.g. for tunnels, building shadow

Abstract

The present invention relates to a method of arranging distributed repeaters and distributed repeater system in a mobile communication system. In a method of arranging at least one base station and repeaters in a mobile communication system, a base station cell is formed and N repeater service areas are formed at boundaries of the base station cell. A base station is arranged at the center of the base station cell and N repeaters are arranged at boundaries between the base station service area and the repeater service areas. The number of repeaters is determined and output powers of the base station and the repeaters are determined according to a ratio of a base station service radius (R) to each repeater service radius (r). Accordingly, UARI or DARI is decreased, and coverage holes and excessive coverage overlaps can be remarkably reduced, so that network average capacity can be improved.

Claims

1. A method of arranging distributed repeaters in a base station cell composed of a plurality of sectors in a mobile communication system, comprising the steps of:

dividing the base station cell into a base station service area and one or more repeater service areas, formed outside the base station service area, in each sector; and

arranging one or more repeaters at boundaries between the base station service area and the repeater service areas,

wherein a number of the one or more repeaters (N) is determined according to a ratio of a radius (R) of the base station service area to a radius (r) of each repeater service area, and

wherein the number of the one or more repeaters (N) arranged in each sector of the base station cell is determined by the following equation;

N=2*(R/r)+1.

2. The method according to claim 1, wherein output powers of the base station and the one or more repeaters are determined according to the ratio of the base station service radius (R) to the repeater service radius (r).

3. The method according to claim 2, Wherein the output powers of the base station and the one or more repeaters satisfy the following equation:

4. The method according to claim 1, wherein the one or more repeaters are arranged such that a ratio of another cell interference to another user interrenee in a serving cell is minimized.

5. The method according to claim 1 , wherein the one or more repeaters arranged in each sector include three repeaters arranged at one location of boundaries between the base station service area and three repeater service areas outside the base station service area.

6. The method according to claim 5, wherein the ratio of the base station service radius (R) to the repeater service radius (r), that is, R/r, is 1.

7. A distributed repeater system, comprising:

a base station composed of a plurality of sectors and configured such that a base station service area is formed in each sector; and

one or more repeaters configured to form repeater service area and arranged at boundaries between the base station service area and the repeater service areas in each sector,

wherein a number of the one or more repeaters (N) is determined according to a ratio of a radius (R) of the base station service area to a radius (r) of each repeater service area, and thus the one or more repeaters are arranged, and

wherein the number of the one or more repeaters (N) arranged in each sector of the base station cell is determined by the following equation;

N=2*(R/r)+1.

8. The distributed repeater system according to claim 7, wherein output powers of the base station and the one or more repeaters are determined according to the ratio of the base station service radius (R) to the repeater service radius (r).

9. The distributed repeater system according to claim 8, wherein the output powers of the base station and the one or more repeaters satisfy the following equation:

10. The distributed repeater system according to claim 7, wherein the one or more repeater is arranged such that a ratio of another cell interference to another user interference in a serving cell is minimized.

11. The distributed repeater system according to claim 7, wherein the one or more repeaters arranged in each sector include three repeaters arranged at one location of boundaries between the base station service area and three repeater service areas outside the base station service area.

12. The distributed repeater system to claim 11, wherein the ratio of the base station service radius (R) to the repeater service radius (r), that is, R/r, is 1.