Access point and terminal wireless transmission power control based on point to point parameter exchanges

• US 20070225026A1
• Filed: 03/22/2006
• Published: 09/27/2007
• Est. Priority Date: 03/22/2006
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Bennett, James
• Granted Patent: US 7,676,241 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04W 52/04 TPC
• CPC Class Codes: H04W 52/265 taking into account the quality of service QoS
• CPC Class Codes: H04W 52/282 taking into account the speed of the mobile
• CPC Class Codes: H04W 52/287 when the channel is in stand-by
• CPC Class Codes: H04W 74/0808 using carrier sensing, e.g. carrier sense multiple access [CSMA]

Abstract

A wireless access point and multiple wireless terminals exchange point-to-point transmission power control parameters. The wireless access point gathers parameters based on transmissions received from each of the wireless terminals. Each wireless terminal gathers parameters based on transmissions received from each of the other wireless terminals and from the wireless access point. In one operating mode, the parameters gathered by the wireless devices are forwarded to the wireless access point, and, based on all received and local parameters, the wireless access point adjusts its own transmission power and sends control signals to the wireless terminals directing transmission power adjustment. In another mode, all parameters are exchanged between every wireless terminal and the access point so that each can independently or cooperatively make transmission power control decisions. Transmission power control parameters include received signal strength, error rates, estimated battery life, availability of unlimited power, active versus sleep mode ratios, anticipated bandwidth utilization, coding schemes available, deterministic/non-deterministic requirements, encryption and security requirements, quality of service requirements, mobility, etc. Gathering of parameters involves both retrieval of preset parameters from memory and generating parameters based on received transmissions (including test packets).

Claims

1. A wireless network having a wireless link, the wireless network comprising:

a plurality of client devices, each of the plurality of client devices having client transceiver circuitry that receives data over the wireless link and that transmits data over the wireless link at a selected power level, at least a first of the plurality of client devices including client device processing circuitry that assesses signals received from other of the plurality of client devices over the wireless link, generates reception characteristics, and transmits the reception characteristics over the wireless link;

an access point having a network interface, communicatively coupled to at least one wide area network, and access point transceiver circuitry that transmits data to and receives data from the plurality of client devices; and

the access point receives and assesses the reception characteristics, and, based on the assessment, the access point generates the selected power level for at least a second of the plurality of client devices, and transmit the selected power level to the at least a second of the plurality of client devices.

2. The wireless network of claim 1, wherein the signals received from other of the plurality of client devices over the wireless link that are assessed by the client device processing circuitry comprise at least a portion of an ongoing data exchange.

3. The wireless network of claim 1, wherein the signals received from other of the plurality of client devices over the wireless link that are assessed by the client device processing circuitry comprise at least one test signal exchange.

4. The wireless network of claim 1, wherein the plurality of client devices transmit status characteristics to the access point, and the access point assesses at least a portion of the status characteristics along with at least a portion of the reception characteristics to generate the selected power level.

5. The wireless network of claim 1, wherein the plurality of client devices transmit mobility characteristics to the access point, and the access point assesses at least a portion of the mobility characteristics along with at least a portion of the reception characteristics to generate the selected power level.

6. The wireless network of claim 1, wherein the plurality of client devices transmit utilization characteristics to the access point, and the access point assesses at least a portion of the utilization characteristics along with at least a portion of the reception characteristics to generate the selected power level.

7. An access point comprising:

a network interface for communicating with at least one wide area network;

access point transceiver circuitry, operatively coupled to the network interface, that transmits data to and receiving data from a plurality of client devices over a wireless link; and

processing circuitry, operatively coupled to the access point transceiver circuitry, that includes a power management application having operational instructions that cause the processing circuitry and access point transceiver circuitry to;

receive reception characteristics generated by at least one of the plurality of client devices, the reception characteristics including strength of signals received by the at least one of the plurality of client devices from others of the plurality of client devices over the wireless link;

determine at least one selected power level based at least in part on the reception characteristics; and

transmit the at least one selected power level to the plurality of client devices.

8. The access point of claim 7, wherein the power management application further includes operational instructions that cause the processing circuitry to receive battery life data generated by the at least one of the plurality of client devices, and determine the selected power level for the at least one of the plurality of client devices based at least in part on the battery life data.

9. The access point of claim 7, wherein the power management application further includes operational instructions that cause the processing circuitry to receive a mobility characteristic generated by the at least one of the plurality of client devices, and determine the selected power level for the at least one of the plurality of client devices based at least in part on the mobility characteristic.

10. A client device comprising:

client transceiver circuitry that receives data over a wireless link, the data including a first selected transmission power level, and that transmits data over the wireless link at the first selected transmission power level; and

processing circuitry, communicatively coupled to the client transceiver circuitry, that;

assesses wireless transmissions at a second selected power level from a first device to a second device over the wireless link;

generates a reception characteristic based on the assessment; and

transmits the reception characteristic over the wireless link to the second device for use in adjusting the second selected power level.

11. The client device of claim 10, wherein the wireless transmissions assessed by the processing comprise at least a portion of an ongoing data exchange between the first device and the second device.

12. The client device of claim 10, wherein the wireless transmissions assessed by the processing comprise at least one test transmission.

13. The client device of claim 10, wherein the processing circuitry delivers a status characteristic to the second device for use in adjusting the first selected transmission power level.

14. The client device of claim 10, wherein the processing circuitry delivers a mobility characteristic to the second device for use in adjusting the first selected transmission power level.

15. The client device of claim 10, wherein the processing circuitry delivers a utilization characteristic to the second device for use in adjusting the first selected transmission power level.

16. In a communication infrastructure supporting a client device and other devices, a method used by processing circuitry of an access point, the method comprising:

receiving a reception characteristic from at least one of the other devices over a wireless link, the reception characteristic relating to at least one wireless transmission from the client device to the access point over the wireless link;

determining, based at least in part on the reception characteristic received from the at least one of the other devices, that a transmission power adjustment is needed; and

transmitting to the client device a request to carry out the transmission power adjustment.

17. The method of claim 16, further comprising receiving a power supply characteristic from the client device over the wireless link;

and the determining that a transmission power adjustment is needed is also based at least in part on the power supply characteristic received.

18. The method of claim 16, further comprising receiving a status characteristic from the client device over the wireless link;

and the determining that a transmission power adjustment is needed is also based at least in part on the status characteristic received.

19. The method of claim 16, further comprising receiving a mobility characteristic from the client device over the wireless link;

and the determining that a transmission power adjustment is needed is also based at least in part on the mobility characteristic received.

20. The method of claim 16, further comprising receiving a utilization characteristic from the client device over the wireless link;

and the determining that a transmission power adjustment is needed is also based at least in part on the utilization characteristic received.

21. A communication infrastructure comprising:

a communication network;

a first client device comprising first processing circuitry, a first wireless receiver, and a first wireless transmitter that has an adjustable transmission power level;

a second client device comprising second processing circuitry, a second wireless receiver, and a second wireless transmitter;

an access point comprising third processing circuitry, a third wireless transmitter, a third wireless receiver, and interface circuitry that communicatively couples with the communication network;

the access point manages communication exchanges with the communication network for the first client device and the second client device via the third wireless transmitter and the third wireless receiver;

the second client device generates a first reception characteristic based on at least a first wireless transmission from the first wireless transmitter of the first client device to the third wireless receiver of the access point, and the second client device delivers the first reception characteristic to the access point;

the first client device generates a second reception characteristic based on at least a second wireless transmission from the second wireless transmitter of the second client device to the third wireless receiver of the access point, and the second client device delivers the first reception characteristic to the access point; and

the access point generates a first request after assessing the first reception characteristic, and the access point delivers the first request to the first client device requesting an adjustment to the transmission power of the first wireless transmitter.

22. The communication infrastructure of claim 21, wherein the first wireless transmission comprising at least a portion of an ongoing data exchange.

23. The communication infrastructure of claim 21, wherein the first wireless transmission comprising at least one test transmission.