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Terminal transmit power control with link adaptation

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Terminal transmit power control with link adaptation


Methods for coordinating power usage and link adaptation in wireless communications are described. Terminals and/or access points (APs) may attempt to modify terminals' transmit power in relation to a desired communication data transfer rate. Link adoption may also be used in conjunction with the described methods.
Related Terms: Access Point Communications Data Transfer Data Transfer Rate Wireless Transfer Rate

Browse recent Toshiba America Research, Inc. patents - Piscataway, NJ, US
USPTO Applicaton #: #20140010174 - Class: 370329 (USPTO) -
Multiplex Communications > Communication Over Free Space >Having A Plurality Of Contiguous Regions Served By Respective Fixed Stations >Channel Assignment

Inventors: Ryoko Matsuo, Shuichi Obayashi, Toshikazu Kodama, David Famolari

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The Patent Description & Claims data below is from USPTO Patent Application 20140010174, Terminal transmit power control with link adaptation.

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CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a divisional of U.S. application Ser. No. 10/968,244, filed Oct. 20, 2004, whose contents are expressly incorporated by reference.

TECHNICAL FIELD

Aspects of the present invention relate to wireless communications. More particularly, aspects of the present invention relate to controlling power used to transmit wireless signals.

RELATED ART

The growth of wireless communications and integration with the internet continues to influence the growth of local area networks. Since the expansion of IEEE 802.11-based communication protocols and related devices, wireless local area networks (WLANs) are appearing with regular frequency. WLANs provide high speed wireless connectivity between PCs, PDAs and other equipment in corporate, public and home environments. WLAN users have come to expect access to WLANs and wanting larger coverage areas and higher throughputs. For portable users power consumption concerns are also an issue.

Currently, IEEE 802.11-series protocols are the leading WLAN standards. Some standards (ex: IEEE 802.11a/b/g) have finished standardization. Some of these standards include the ability to modify power on a link to a unit.

At the same time, wireless providers are experimenting with adaptive antenna arrays (also referred to as smart array antennas). Current approaches to adaptive antenna arrays do not address power control issues. Rather, adaptive arrays concentrate on beam steering techniques.

SUMMARY

Aspects of the present invention address one or more of the issues identified above, thereby providing an improved power control system for use with wireless communications.

BRIEF DESCRIPTION OF DRAWINGS

Aspects of the present invention are described in relation to the following drawings.

FIG. 1 shows transmit power control in accordance with aspects of the present invention.

FIGS. 2A and 2B show changing array patterns based on load equalization in accordance with aspects of the present invention.

FIGS. 3A and 3B show changing array patterns based on packet steering in accordance with aspects of the present invention.

FIG. 4 shows a process for reducing power in accordance with aspects of the present invention.

FIG. 5 shows a conventional link adaptation method.

FIGS. 6 and 7 show link adaptation in accordance with aspects of the present invention.

FIGS. 8A and 8B show modifications of antenna parameters in accordance with aspects of the present invention.

FIGS. 9-18 show link adaptation in accordance with aspects of the present invention.

FIG. 19 shows an illustrative example of a base station in accordance with aspects of the present invention.

FIGS. 20-21 show additional illustrative examples of access points in accordance with aspects of the present invention.

FIG. 22 shows a process for determining premium gain in accordance with aspects of the present invention.

DETAILED DESCRIPTION

Aspects of the present invention relate to controlling power in access points for us with wireless local area networks. The following has been divided into sections to assist the reader: power control; transmit power control in IEEE 802.11h; transmit power control in IEEE 802.11b, 802.11e, and other standards; link adaptation methods; and transmit power control with link adaptation.

It is noted that various connections are set forth between elements in the following description. It is noted that these connections in general and, unless specified otherwise, may be direct or indirect and that this specification is not intended to be limiting in this respect.

Power Control

Aspects of the present invention may be used with non-reciprocal uplink and downlink systems in terms of link gain. For instance, aspects of the present invention may be used with WLAN systems using access points (APs) with smart antennas. Here, aspects of the present invention address at least one of the stations transmit rate but also the stations power consumption. Transmit power control (TPC) capabilities and link adaptation may be used with various environments or expectations. For example, aspects of the present invention may be used in systems where stations transmit with their highest data rate or where stations transmit with their lowest power.

To realize the reduction in power consumption while maintaining usefulness of the system, methods and systems that function with TPC and compliant wireless LAN APs and stations may be used.

Power reduction does not mean that all devices will always be connected to an access point. Rather, hidden terminals exist where every station\'s transmit power isn\'t enough to reach every other station or back to an access point. In the 802.11b or 802.11e specification, stations transmit with a constant power and have no TPC functionality. The following describes various approaches to allow TPC in 802.11 protocols.

Transmit Power Control in IEEE 802.11h

IEEE 802.11h is a specification for Europe in 5-GHz band. This specification mainly deals with TPC and Dynamic Frequency Selection (DFS). The primary reason for TPC in 802.11h is that TPC (which means maximum regulatory transmit power setting in 802.11h) is required for operation on a 5 GHz band in Europe. Concerning TPC, 802.11h defines only the frame structure. It describes no method to achieve TPC.

Aspects of the present invention relate to using IEEE 802.11h specification\'s Probe Request/Response or Action commands to send some TPC information. These features may help other IEEE 802.11 specifications use TPC. These commands may or may not be used to transmit control signals to help avoid any hidden terminals. If control signals are used, they may be set to transmit with normal power to avoid the hidden terminal problem. This may include some modification of both AP and stations. However, aspects of the present invention may use any slot or frame that is reserved in 802.11b/e specification to allow for TPC based on a technique similar to that used with 802.11h.

While both 802.11h and 802.11b have frame structures, they are not identical. The following describes various observations in 802.111h and how to achieve TPC in non-802.11h protocols. a. For a TPC report, 802.11h changes the Probe response for this operation. While the response is changed, no change is made with the Probe Request to initiate TPC. Rather, 802.11h uses an Action frame for a TPC request. i. The same changes in Probe response in 802.11b/e are possible, because an order number that is used for TPC in 802.11h is currently reserved in 802.11b/e. ii. In 802.11b, there is no regulation for an Action frame. Thus, it is easier to modify Probe request in this protocol. iii. In 802.11e, both an Action frame and a Probe request are defined. b. In 802.11h, a station knows that an AP does TPC if a Spectrum Management slot (inside Beacon or Probe response) is set by 1. i. The same slot of a Spectrum Management slot is reserved in 802.11b/11e. Aspects of the present invention may use this slot to achieve TPC.

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stats Patent Info
Application #
US 20140010174 A1
Publish Date
01/09/2014
Document #
13900096
File Date
05/22/2013
USPTO Class
370329
Other USPTO Classes
International Class
04W52/24
Drawings
21


Access Point
Communications
Data Transfer
Data Transfer Rate
Wireless
Transfer Rate


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