Method for performing diversity and handoff in all internet protocol network

• US 20010026541A1
• Filed: 02/20/2001
• Published: 10/04/2001
• Est. Priority Date: 02/19/2000
• Status: Abandoned Application

• Current Assignee: Utstarcom Korea Limited
• Original Assignee: Utstarcom Korea Limited
• Inventors: You, In-Ho, Park, Jae-Hong, Koo, Yeon-Sang
• Application Number:
  US09/788,757
• Publication Number:
  US 20010026541A1
• Time in Patent Office: Days
• US Class Current: 370/331
• CPC Class Codes: H04B 7/022 Site diversity; Macro-diversity using two or more spaced independent antennas H04B7/04
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04W 36/30 by measured or perceived connection quality data
• CPC Class Codes: H04W 36/302 due to low signal strength

Abstract

A method for performing a diversity and a handoff in All IP network is disclosed. The method for performing a handoff in All IP network includes the steps of: a) at a mobile station communicating with a first base transceiver station (BTS), determining whether a strength of a pilot signal from a second BTS is lager than a threshold value; b) if the strength of the pilot signal from the second BTS is lager than the threshold value, adding a handoff from the first BTS to the second BTS; c) communicating with the all IP network through the first BTS and the second BTS based on a diversity function; d) determining whether a strength of a pilot signal from the first BTS is smaller than the threshold value; e) if the strength of the pilot signal from the first BTS is smaller than the threshold value, requesting a handoff remove; and f) releasing a traffic channel between the MS and the first BTS.

Claims

1. A method for performing a diversity in an all Internet protocol (All IP) network, comprising the steps of:

a) at a first BTS, receiving a first data frame from a MS and a second data frame through a second BTS from the MS;

b) at the first BTS, checking an error (or errors) in each of the first and the second data frames; and

c) at the first BTS, selecting one data frame having less error(s).

2. A method for performing a diversity in an all Internet protocol (All IP) network, comprising the steps of:

a) at a first BTS, receiving a data frame from an IP network;

b) at the first BTS, duplicating the data frame;

c) at the first BTS, transmitting one of the duplicated data frames to a mobile station (MS) directly and the other to the MS through the second BTS;

d) at the MS, checking an error (or errors) in each of the data frames from the first and the second BTS; and

e) at the MS, selecting one data frame having less error(s).

3. A method for performing a diversity in an all Internet protocol (All IP) network, comprising the steps of:

a) at a frame selection/distribution means, receiving a first data frame through a first BTS and a second frame through a second BTS from a MS;

b) at the frame selection/distribution means, checking an error (or errors) in each of the first and the second data frames; and

c) at the frame selection/distribution means, selecting one data frame having less error(s).

4. The method as recited in

claim 3

, wherein the frame selection/distribution means is located in a radio access network (RAN) gateway.

5. A method for performing a diversity in an all Internet protocol (All IP) network, comprising the steps of:

a) at a frame selection/distribution means, receiving a data frame from an IP network;

b) at the frame selection/distribution means, duplicating the data frame;

c) at the frame selection/distribution means, transmitting one of the duplicated data frames to a mobile station (MS) directly and the other to the MS through the second BTS;

d) at the MS, checking an error (or errors) in each of the data frames from the first and the second BTS; and

e) at the MS, selecting one data frame having less error(s).

6. The method as recited in

claim 5

, wherein the frame selection/distribution means is located in a radio access network (RAN) gateway.

14. The method as recited in

claim 5

, wherein the frame selection/distribution means is located in a radio access network (RAN) gateway.

7. A method for performing a handoff in an all Internet protocol (All IP) network, comprising the steps of:

a) at a mobile station (MS) communicating with a first base transceiver station (BTS), determining whether a strength of a pilot signal from a second BTS is lager than a threshold value;

b) if the strength of the pilot signal from the second BTS is lager than the threshold value, at the MS, requesting a handoff add from the first BTS to the second BTS;

c) communicating with an Internet protocol (IP) network through the first BTS and the second BTS based on a diversity function;

d) determining whether a strength of a pilot signal from the first BTS is smaller than the threshold value;

e) if the strength of the pilot signal from the first BTS is smaller than the threshold value, requesting a handoff remove; and

f) releasing a traffic channel between the MS and the first BTS.

8. The method as recited in

claim 7

, wherein the step b) includes the steps of:

b1) establishing a traffic channel between the first BTS and the second BTS;

b2) establishing a traffic channel between the first BTS and a radio access network (RAN) gateway; and

b3) at the MS, receiving handoff direction information from the first BTS and the second BTS and establishing a traffic channel between the MS and the BTS B.

9. The method as recited in

claim 7

, wherein the step c) includes the steps of:

c1) at the first BTS, receiving a first data frame from a MS and a second data frame through a second BTS from the MS;

c2) at the first BTS, checking an error (or errors) in each of the first and the second data frames; and

c3) at the first BTS, selecting one data frame having less error(s).

10. The method as recited in

claim 7

, wherein the step c) includes the steps of:

c1) at the first BTS, receiving a data frame from an IP network;

c2) at the first BTS, duplicating the data frame;

c3) at the first BTS, transmitting one of the duplicated data frames to a mobile station (MS) directly and the other to the MS through the second BTS;

c4) at the MS, checking an error (or errors) in each of the data frames from the first and the second BTS; and

c5) at the MS, selecting one data frame having less error(s).

11. The method as recited in

claim 7

, wherein the step c) includes the steps of:

c1) at a frame selection/distribution means, receiving a first data frame through a first BTS and a second frame through a second BTS from a MS;

c2) at the frame selection/distribution means, checking an error (or errors) in each of the first and the second data frames; and

c3) at the frame selection/distribution means, selecting one data frame having less error(s).

12. The method as recited in

claim 11

, wherein the frame selection/distribution means is located in a radio access network (RAN) gateway.

13. The method as recited in

claim 7

, wherein the step c) includes the steps of:

c1) at a frame selection/distribution means, receiving a data frame from the IP network;

c2) at the frame selection/distribution means, duplicating the data frame;

c3) at the frame selection/distribution means, transmitting one of the duplicated data frames to the mobile station (MS) directly and the other to the MS through the second BTS;

c4) at the MS, checking an error (or errors) in each of the data frames from the first and the second BTS; and

c5) at the MS, selecting one data frame having less error(s).

15. A computer readable recording medium storing instructions for executing a method for performing a handoff in an all Internet protocol (All IP) network, comprising the steps of:

a) at a mobile station communicating with a first base transceiver station (BTS), determining whether a strength of a pilot signal from a second BTS is lager than a threshold value;

b) if the strength of the pilot signal from the second BTS is lager than the threshold value, adding a handoff from the first BTS to the second BTS;

c) communicating with the all IP network through the first BTS and the second BTS based on a diversity function;

d) determining whether a strength of a pilot signal from the first BTS is smaller than the threshold value;

e) if the strength of the pilot signal from the first BTS is smaller than the threshold value, requesting a handoff remove; and

f) releasing a traffic channel between the MS and the first BTS.