Method and apparatus for mitigating oscillation between repeaters

• US 8,559,379 B2
• Filed: 09/21/2007
• Issued: 10/15/2013
• Est. Priority Date: 09/21/2006
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Gainey, Kenneth M., Proctor, James A. Jr., LaMont, Lawrence Wayne Jr., Otto, James C., Puig, Carlos M., Lintelman, Ross L.
• Primary Examiner(s): Lai, Andrew
• Assistant Examiner(s): Ganguly, Sumitra
• Application Number:
  US12/307,904
• Publication Number:
  US 20090290526A1
• Time in Patent Office: 2,216 Days
• Field of Search: 370/279, 370/280, 370/315, 370/328, 370/329, 370/428, 370/466, 370/401, 370/438, 455/9, 455/10, 455/11.1, 455/47, 455/445, 375/260, 375/356
• US Class Current: 370/329
• CPC Class Codes: H04B 7/155 Ground-based stations H04B7/204 takes precedence
• CPC Class Codes: H04W 16/26 Cell enhancers or enhancement, e.g. for tunnels, building shadow

Abstract

A first repeater operating within a wireless network including a second repeater capable of communicating with the first repeater, and first and second wireless station devices capable of communicating with at least one of the first repeater and the second repeater, includes a reception device for receiving a wireless signal at a reception frequency; a detector for detecting if a predetermined portion of the received wireless signal includes a modified portion to thereby determine that the received signal is from the second repeater; and a transmission device for transmitting the wireless signal to one of the first and second wireless station devices at a transmission frequency to thereby repeat the wireless signal.

Claims

1. A first repeater operating within a wireless network, the wireless network including a second repeater capable of communicating with the first repeater, and first and second wireless station devices capable of communicating with at least one of the first repeater and the second repeater, the first repeater comprising:

a reception device for receiving a wireless signal at a reception frequency;

a detector for detecting if a predetermined portion of the received wireless signal includes a modified portion to thereby determine that the received signal is from the second repeater; and

a transmission device for transmitting the wireless signal to one of the first and second wireless station devices at a transmission frequency to thereby repeat the wireless signal, wherein the repeater further comprises;

a processor; and

a memory coupled to the processor, the memory for storing a power adjustment routine for configuring the processor;

wherein the processor is configured to;

generate probe packets to be transmitted to the second repeater at the transmission frequency;

measure a received signal strength indication (RSSI) of a packet received in response to the probe packets;

determine if a path loss defined by a difference between a power level at which the probe packets were transmitted and the measured RSSI is less than a predetermined value; and

mark the transmission frequency as unavailable for use if the path loss is less than the predetermined value.

2. The first repeater of claim 1, wherein the processor is further configured to:

generate a group of packets to be transmitted to the second repeater at the transmission frequency if the path loss is not less than approximately the predetermined value;

determine an average RSSI for the group of packets;

if the average RSSI is less than a predetermined level, mark a current transmission power as acceptable.

3. The first repeater of claim 2, wherein the processor is further configured to:

adjust the current transmission power downward by a predetermined decibel level if the average RSSI is less not than the predetermined level;

regenerate the group of packets to be transmitted to the second repeater at the transmission frequency;

determine an average RSSI for the group of packets; and

if the average RSSI is less than a predetermined level, mark a current transmission power as acceptable.

4. A first repeater operating within a wireless network, the wireless network including a second repeater capable of communicating with the first repeater, and first and second wireless stations capable of communicating with at least one of the first repeater and the second repeater, the first repeater comprising:

a reception device receiving a wireless signal from one of the second repeater, first wireless station, and second wireless station;

a detection device coupled to the reception device, the detection device detecting if a received signal strength indication (RSSI) of the wireless signal is greater than a predetermined RSSI threshold;

a digital demodulator coupled to the reception device, the digital demodulator configured to demodulate the wireless signal if the detected RSSI is greater than the predetermined RSSI threshold;

a signal modification device coupled to the reception device, the signal modification device configured to modify a predetermined portion of the wireless signal; and

a transmission device coupled to the signal modification device for transmitting the modified wireless signal to one of the second repeater, first wireless station, and second wireless station;

wherein the signal modification device includes a bi-phase modulation device configured to modulate a phase of the predetermined portion of the wireless signal, and

wherein the bi-phase modulator includes a transfer switch coupled to a linear oscillator (LO), the transfer switch switching positive and negative terminals of the LO at a predetermined frequency to modulate the phase of the predetermined portion of the wireless signal.

5. A first repeater operating within a wireless network, the wireless network including a second repeater capable of communicating with the first repeater, and first and second wireless stations capable of communicating with at least one of the first repeater and the second repeater, the first repeater comprising:

a reception device receiving a wireless signal including one or more packets at a reception frequency;

a signal modification and detection device coupled to the reception device, the signal modification and detection device configured to modify a predetermined portion of the packet to thereby generate a modified wireless signal and to detect if a predetermined portion of the packet includes a modified signal pattern;

a transmission device coupled to the signal modification and detection device for transmitting the modified wireless signal to one of the second repeater, first wireless station, and second wireless station at a predetermined power level and a transmission frequency;

a processor controlling the reception device and the transmission device; and

a memory coupled to the processor, the memory for storing a power adjustment routine for configuring the processor to;

generate probe packets to be transmitted to the second repeater at the transmission frequency;

measure a received signal strength indication (RSSI) of a packet received in response to the probe packets; and

adjust one of the power level or the transmission frequency in accordance with the measured RSSI.

6. The first repeater of claim 5, wherein the signal modification and detection device coupled to the reception device comprises a notch processor configured to insert a notch pattern on the wireless signal to be transmitted and detect a notch pattern inserted on a wireless signal received from the second repeater.

7. The first repeater of claim 5, wherein the signal modification and detection device coupled to the reception device comprises:

a bi-phase modulation device configured to modulate a phase of the predetermined portion of the wireless signal; and

a digital demodulator coupled to the reception device, the digital demodulator configured to determine if the wireless signal includes a modulated phase pattern as the modified portion.