Method for extending the cell radius between a mobile station and a base station

• US 6,192,247 B1
• Filed: 06/28/1999
• Issued: 02/20/2001
• Est. Priority Date: 06/28/1999
• Status: Expired due to Term

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Nedelcu, Bogdan Romulus, Dillon, Matthew James
• Primary Examiner(s): Trost, William G.
• Assistant Examiner(s): Craver, Charles
• Application Number:
  US09/344,770
• Time in Patent Office: 603 Days
• Field of Search: 455/423, 455/403, 455/424, 455/425, 455/446, 455/449, 455/453, 455/456, 455/501-503, 455/507, 455/561, 455/67.4, 455/524, 455/436, 370/252, 370/337, 370/347, 370/350
• US Class Current: 455/446
• CPC Class Codes: H04W 16/26 Cell enhancers or enhancement, e.g. for tunnels, building shadow
• CPC Class Codes: H04W 56/0005 synchronizing of arrival of multiple uplinks
• CPC Class Codes: H04W 56/0045 compensating for timing error by altering transmission time
• CPC Class Codes: H04W 92/10 between terminal device and access point, i.e. wireless air interface

Abstract

The present invention provides a method for extending the cell radius between a mobile station (101) and a base station (103). A propagation delay is determined between the mobile station (101) and the base station (103). A transmit time offset is determined for the mobile station (101). The transmit time offset is based at least in part upon the propagation delay. Information is then transmitted between the mobile station (101) and the base station (103) at the transmit time offset.

Claims

1. A method for extending he cell radius between a mobile station and a base station, the method comprising the steps of:

determining a propagation delay between the mobile station and the base station;

determining a transmit time offset for the mobile station, the transmit time offset based at least in part upon the propagation delay, wherein the step of determining a transmit time offset for the mobile station comprises the steps of transmitting a probe from the mobile station to the base station and continuing to transmit the probe from the mobile station to the base station until the mobile station receives an acknowledgement message from the base station; and

transmitting information between the mobile station and the base station at the transmit time offset.

2. A method for extending the cell radius between a mobile station and a base station in accordance with claim 1, wherein the step of determining a transmit time offset for the mobile station comprises determining a transmit time offset for the mobile station at the mobile station.

3. A method for extending the cell radius between a mobile station and a base station in accordance with claim 1, wherein the step of transmitting a probe comprises the step of transmitting an origination message from the mobile station to the base station.

4. A method for extending the cell radius between a mobile station and a base station in accordance with claim 1, wherein the step of transmitting a probe comprises the step of transmitting a paging response message from the mobile station to the base station.

5. A method for extending the cell radius between a mobile station and a base station in accordance with claim 1, wherein the step of continuing to transmit the probe comprises the steps of:

setting a timer at the mobile station; and

if the timer expires;

applying a predetermined offset at the mobile station; and

retransmitting the probe at the predetermined offset.

6. A method for extending the cell radius between a mobile station and a base station in accordance with claim 5, further comprising the step of storing the last successful response from the base station.