Mobile station localization apparatus, systems, and methods

• US 7,787,891 B2
• Filed: 12/20/2006
• Issued: 08/31/2010
• Est. Priority Date: 12/20/2006
• Status: Expired due to Fees

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Taaghol, Pouya, Venkatachalam, Muthaiah
• Primary Examiner(s): Edouard; Patrick N
• Assistant Examiner(s): THIER, MICHAEL
• Application Number:
  US11/613,905
• Publication Number:
  US 20080153507A1
• Time in Patent Office: 1,350 Days
• Field of Search: 455/404.2, 4554561-457, 370/332
• US Class Current: 455/456.6
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management

Abstract

Embodiments herein may use first and second path loss values L1 and L2 to calculate first and second distances R1 and R2 between the MS and first and second base stations BS1 and BS2, respectively, in a a reduction in signal strength of signals as transmitted by the BS1 and the BS2 wireless packet-carrying network. L1 and L2 may comprise values of and as received by the MS. The MS may triangulate its position relative to a grid using R1 and R2. Other embodiments may be described and claimed.

Claims

1. A method, including:

at a mobile station (MS) in a wireless packet-carrying network, calculating a first distance (R1) between the MS and a first base station (BS1) using a first path loss value (L1), wherein L1 comprises a value of a reduction in signal strength of a signal as transmitted by the BS1 and as received by the MS;

calculating a second distance (R2) between the MS and a second base station (BS2) using a second path loss value (L2), wherein L2 comprises a value of a reduction in signal strength of a signal as transmitted by the BS2 and as received by the MS; and

triangulating a position of the MS relative to a grid using R1 and R2, wherein triangulating the position of the MS relative to the grid comprises;

solving R1²=(X-X₁)²+(Y-Y₁)² and R2²=(X-X₂)²+(Y-Y₂)² for X and Y, wherein X and Y comprise coordinates of the MS on the grid, X₁ and Y₁ comprise coordinates of the BS1 on the grid, and X₂ and Y₂ comprise coordinates of the BS2 on the grid;

receiving first path loss parameter values at the MS from the BS1, wherein the first path loss parameter values comprise at least one of a value of transmit power (P1) at the BS1, an antenna height (H1) associated with the BS1, or a position (X1,Y1) of the BS1 relative to a grid;

receiving second path loss parameter values at the MS from the BS2, wherein the second path loss parameter values comprise at least one of a value of transmit power (P2) at the BS2, an antenna height (H2) associated with the BS2, and a position (X2, Y2) of the BS2 relative to the grid;

calculating R1 as ten to the power of (L1−

(46.3+33.9 log(f_c1)−

13.82 log(h_b1))−

E1+G1)/(44.9−

6.55 log(h_b1)); and

calculating R2 as ten to the power of (L2−

(46.3+33.9 log(f_c2)−

13.82 log(h_b2))−

E2+G2)/(44.9−

6.55 log(h_b2)), wherein E1 and E2 are approximately equal to 3.2(log(11.75h_m))²−

4.97, G1 and G2 are approximately equal to zero dBm for medium cities and suburban areas and three dBm for large cities, f_c1 is approximately equal to a carrier frequency associated with the BS1, f_c2 is approximately equal to a carrier frequency associated with the BS2, h_b1 is an approximate height of an antenna associated with the BS1 above a ground level, h_b2 is an approximate height of an antenna associated with the BS2 above the ground level, and h_m is an approximate height of an antenna associated with the MS above the ground level.

2. The method of claim 1, wherein h_m is configured statically in the MS.

3. The method of claim 1, further including:

performing at least one of displaying (X,Y) on a display at the MS, using (X,Y) in an operation at the MS, or transmitting (X,Y) to another network entity for at least one of display at the other network entity, use in an operation at the other network entity, or forwarding to a third network entity.