Method and apparatus for scanning sectors in order of distance from mobile station

• US 9,572,074 B2
• Filed: 04/16/2012
• Issued: 02/14/2017
• Est. Priority Date: 07/25/2007
• Status: Active Grant

• Current Assignee: Sprint Spectrum LP (Deutsche Telekom AG)
• Original Assignee: Sprint Spectrum LP (Deutsche Telekom AG)
• Inventors: Shetty, Manoj, Vargantwar, Sachin R., Oroskar, Siddharth S., Canjeevaram, Ashvini G., Rai, DeveshKumar
• Primary Examiner(s): CASCA, FRED A
• Application Number:
  US13/447,926
• Publication Number:
  US 20120214484A1
• Time in Patent Office: 1,765 Days
• Field of Search: 455/456.1, 455/101, 455/63.2, 455/434, 455/442, 455/441, 455/67.1, 455/443, 455/456.3, 455/456.2, 370/500, 370/338, 370/328, 375/145, 375/227
• US Class Current: 1/1
• CPC Class Codes: H04W 36/00835 Determination of neighbour cell lists
• CPC Class Codes: H04W 4/02 Services making use of location information
• CPC Class Codes: H04W 4/029 Location-based management or tracking services
• CPC Class Codes: H04W 64/006 with additional information processing, e.g. for direction or speed determination

Abstract

A mobile station will sort wireless coverage sectors in order of distance of the sectors from the mobile station, and the mobile station will then scan for pilot signals from the sectors in the sorted order. The invention can be applied advantageously to provide an order of scanning remaining set sectors in a mobile station operating according to a code division multiple access protocol.

Claims

1. A method comprising:

storing in data storage of a mobile station at least one list of wireless coverage sectors;

storing in data storage of the mobile station a further list of wireless coverage sectors and their locations;

determining a geographic location of the mobile station, and sorting wireless coverage sectors of the further list in order of distance between their locations and the determined mobile station location, so as to produce a sorted list of wireless coverage sectors;

the mobile station scanning for incoming pilot signals from the wireless coverage sectors of the at least one list; and

the mobile station scanning for incoming pilot signals from the wireless coverage sectors of the sorted list in the sorted order,

wherein the at least one list of wireless coverage sectors comprises (i) an active set of one or more sectors, (ii) a candidate set of one or more sectors, and (iii) a neighbor set of one or more sectors,

wherein scanning for incoming pilot signals from the wireless coverage sectors of the at least one list comprises scanning for incoming pilot signals from the wireless coverage sectors of the active set, of the candidate set, and of the neighbor set, and

wherein sorting wireless coverage sectors of the further list in order of distance between their locations and the determined mobile station location, so as to produce a sorted list of wireless coverage sectors comprises;

filtering the further list to exclude wireless coverage sectors that are in any of the active set, the candidate set, and the neighbor set, for each remaining wireless coverage sector in the further list, determining a distance between the wireless coverage sector'"'"'s location and the determined location of the mobile station and sorting the wireless coverage sectors of the further list in order from closest to the mobile station to farthest from the mobile station, to produce the sorted list.

2. A method comprising:

storing in data storage of a mobile station at least one list of wireless coverage sectors;

storing in data storage of the mobile station a further list of wireless coverage sectors and their locations;

determining a geographic location of the mobile station, and sorting wireless coverage sectors of the further list in order of distance between their locations and the determined mobile station location, so as to produce a sorted list of wireless coverage sectors;

the mobile station scanning for incoming pilot signals from the wireless coverage sectors of the at least one list; and

the mobile station scanning for incoming pilot signals from the wireless coverage sectors of the sorted list in the sorted order,

wherein the at least one list of wireless coverage sectors comprises (i) an active set of one or more sectors, (ii) a candidate set of one or more sectors, and (iii) a neighbor set of one or more sectors,

wherein scanning for incoming pilot signals from the wireless coverage sectors of the at least one list comprises scanning for incoming pilot signals from the wireless coverage sectors of the active set, of the candidate set, and of the neighbor set, and

wherein scanning for incoming pilot signals from the wireless coverage sectors of the active set, of the candidate set, and of the neighbor set comprises;

(a) scanning for pilot signals from all wireless coverage sectors of the active set, (b) scanning for pilot signals from all wireless coverage sectors of the candidate set, (c) scanning for a pilot signal from a wireless coverage sector of the neighbor set, (d) scanning for pilot signals from all wireless coverage sectors of the active set, (e) scanning for pilot signals from all wireless coverage sectors of the candidate set, (f) scanning for a pilot signal from another wireless coverage sector of the neighbor set, (g) repeating steps (d)-(f) until the mobile station has scanned for a pilot signal from each wireless coverage sector of the neighbor set.