Method for locating mobile station based on power-related message of base transceiver station

• US 20010027114A1
• Filed: 03/29/2001
• Published: 10/04/2001
• Est. Priority Date: 03/30/2000
• Status: Active Grant

• Current Assignee: UTStarcom Incorporated (UTStarcom Holdings Corp.)
• Original Assignee: Hyundai Electronics Industries Co. Ltd. (SK Hynix Inc.)
• Inventors: Kim, Sang-Seong
• Granted Patent: US 6,731,941 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management

Abstract

A method for locating a mobile station (MS) based on a power-related message of base transceiver stations (BTS) in a mobile communication system includes the steps of: by a call control processor (CCP) of a base station controller (BSC), checking an active set that the mobile station currently holds; by the call control processor, determining if the active set is covered over three base transceiver stations; if the active set is not covered over the three base transceiver stations, by frequency allocation of the active set, reading out status information of neighboring base transceiver stations; by the call control processor, determining if the frequency allocation of the active set is usable; if the frequency allocation is usable, transmitting to the mobile station a PSMRO (pilot strength message request order) that is a message for requesting to measure pilot strength of the frequency allocation; arranging a plurality of base transceiver stations in order of pilot strength based on the pilot strength measurement result and selecting 3 base transceiver stations having higher pilot strength; and directing the selected 3 base transceiver stations to be prepared to receive a PUF (PUF=power up function) pulse.

Claims

1. A method for locating a mobile station (MS) based on a power-related message of base transceiver stations (BTS) in a mobile communication system, comprising the steps of:

a) by a call control processor (CCP) of a base station controller (BSC), checking an active set that the mobile station currently holds;

b) by the call control processor, determining if the active set is covered over three base transceiver stations;

c) if the active set is not covered over the three base transceiver stations, by frequency allocation of the active set, reading out status information of neighboring base transceiver stations;

d) by the call control processor, determining if the frequency allocation of the active set is usable;

e) if the frequency allocation is usable, transmitting to the mobile station a PSMRO (pilot strength message request order) that is a message for requesting to measure pilot strength of the frequency allocation;

f) arranging a plurality of base transceiver stations in order of pilot strength based on a pilot strength measurement result and selecting 3 base transceiver stations having higher pilot strength; and

g) directing the selected 3 base transceiver stations to be prepared to receive a PUF (PUF=power up function) pulse.

2. The method as recited in

claim 1

, wherein the step c) further includes the step of:

h) if the active set is covered over the three base transceiver stations, directing the 3 base transceiver stations to be prepared to receive the PUF pulse and transmitting to the mobile station a PUF message for requesting to transmit the PUF pulse.

3. The method as recited in

claim 1

, wherein the step g) further includes the step of:

i) allocating a new PUF channel to 2 inactive base transceiver stations and directing the 2 inactive base transceiver stations to be prepared to receive the PUF pulse.

4. The method as recited in

claim 1

, wherein at the step e), the call control processor further transmits to the mobile station frequency allocation of the current active set and a pseudo noise.

5. The method as recited in

claim 1

, wherein the step e) further includes the step of:

j) if the frequency allocation is not usable, transmitting to the mobile station a search request message that the mobile station needs to search candidate frequency allocation usable in all neighboring base transceiver stations.

6. The method as recited in

claim 5

, wherein the step j) includes the step of:

j1) arranging a plurality of base transceiver stations in order of pilot strength based on the candidate frequency search result and selecting 3 base transceiver stations having higher pilot strength;

j2) reading out status information of the 3 base transceiver stations selected at the step j1);

j3) determining if the current frequency allocation is active and usable in all of the selected 3 base transceiver stations;

j4) if the current frequency allocation is usable, directing an active base transceiver station to be prepared to receive the PUF pulse, allocating a first new PUF channel to 2 inactive base transceiver stations and transmitting to the mobile station a PUF message for requesting the PUF pulse.

7. The method as recited in

claim 6

, wherein the step j4) further includes the step of:

j5) if the current frequency allocation is not usable, allocating a second new PUF channel usable in all the selected 3 base transceiver stations to the selected 3 base transceiver stations and directing the 3 base transceiver stations to be prepared to receive the PUF pulse.