MXPA06007406A - Method and apparatus for providing individual power control information in a wireless local area network/wireless wide area network (wlan/wwan) - Google Patents

Abstract

Method and apparatus employed by wireless network components such as access points (APs) for controlling transmitting power level of individual wireless transmitter/receiver units (WTRUs) by establishing a power transmit level based on prior transmit and receiving transmission and reception statistics such as signal to noise ratio (SNR), bit error rate (BER), frame error rate (FER) and/or the like. Power transmit level information is preferably communicated through any one of a clear to send (CTS), request to send (RTS), data and acknowledge (ACK) frame. Alternatively the power control information may be inserted into a beacon frame or an individual control frame specifically designated for power control. The WTRUs preferably have battery level sensors and adjust power control level responsive to a sensed battery level. Alternatively, the APs and WTRUs may reverse roles and the WTRUs may provide power transmit level information to an AP to facilitate transmissions by the AP.

Description

Published: For two-letter codes and other abbreviations, refer to the "Guid- - without intemational search repon and to be republished an e Notes on Codes and Abbreviations" appearing at the begin- ning receipt ofthat repon ning no ofeach regular issue of the PCT Gazette.

METHOD AND APPARATUS FOR PROVIDING CONTROL INFORMATION INDIVIDUAL POWER IN A WIRELESS NETWORK OF LOCAL AREA / WIRELESS NETWORK OF EXTENSIVE AREA (LAN / W AN) FIELD OF THE INVENTION The present invention relates to wireless local area networks / wireless wide area networks (WLANs / WWANs) and, more particularly, to a method and apparatus for use in WLAN / WWAN to provide individualized power information.

BACKGROUND Wireless communication systems are well known in the art. Generally, such systems comprise communication stations, which transmit and receive wireless communication signals between one and the other. Depending on the type of system, the communication stations are typically one of two types of wireless transmit / receive units (WTRUs): base stations or subscriber units, which include mobile units. The term "base station" as used herein includes, but is not limited to, a base station, a Node B, a site controller, an access point or other interface device in a wireless environment that provides the WTRUs. with wireless access to a network with which the base station is associated.

The term WTRU, as used herein, includes, but is not limited to, a user equipment, a mobile station, a fixed or mobile subscriber unit, a pager, or any other type of device capable of operating in a wireless environment. WTRUs include personal communication devices, such as telephones, video telephones, and Internet ready telephones that have network connections. In addition, WTRUs include portable personal computing devices, such as PDAs and pocketbooks with wireless modems that have similar network capabilities. Reference is made to WTRUs that are portable or may, in some other way, change their location as mobile units. Generically, the base stations are also the WTRU. Typically, a network of base stations is provided when each base station is capable of establishing wireless communications concurrent with the WTRUs. properly configured. Some WTRUs are configured to establish wireless communications directly with each other, that is, without being retransmitted over a network via a base station. This is commonly called wireless peer-to-peer communications. When a WTRU is configured to communicate with other WTRUs, it can configure itself and function as a base station. WTRUs can be configured for use in multiple networks with both capabilities communication between peers and network. A type of wireless system, called a wireless local area network (WLAN), can be configured to establish wireless communications with WTRUs equipped with WLAN modems that are also capable of establishing peer-to-peer communications with similarly equipped WTRUs. Currently, WLAN modems are integrated into a large number of computing and communication devices by manufacturers. For example, cell phones, personal digital assistants, and laptop computers are built with one or more WLAN modems. Popular WLAN environments with one or more WLAN base stations, typically called access points (APs), are built in accordance with IEEE 802.11 standards. Access to these networks usually requires user authentication procedures. The protocols for such systems are currently standardized in the area of WLAN technology. Such a protocol structure is the IEEE 802 family of standards. A basic service set (BSS) is the basic building block of an IEEE 802.11 WLAN and this consists of the WTRUs that are also referred to as stations. (STAs) Basically, the set of WTRUs that can talk to each other can form a BSS. Multiple BSS are interconnected through a component architectural, called distribution system (DS), to form an extended service set (ESS). An access point (AP) is a WTRU that provides access to DS, providing DS services and generally allowing concurrent access to DS through multiple WTRUs. A WTRU network that operates with peer-to-peer communications in an IEEE 802.11 environment, which is typically referred to as an "ad hoc" mode, is referred to as an "independent BSS." In a "stand-alone BSS", two or more WTRU establish a communication between them without the need for a coordination network element. No AP to network infrastructure is required. However, an AP can be configured with ad hoc protocols to act like the other WTRUs in peer-to-peer communications. In such a case, an AP can act as a bridge or router to another network or to the Internet. The WTRU that initiates an ad hoc network selects the operational parameters of the ad hoc network, such as the service set identifier (SSID), channel and timing of beacon and channel, and then transmits this information, for example, into beacon. When the stations join the ad hoc network, they assimilate the operational parameters. When using network infrastructure and wireless communications are controlled through APs, parameters such as SSID are normally specified by a network controller connected to APs, which periodically broadcast a beacon frame to allow the WTRUs to identify the AP and attempt to establish communications. The SSID in an IEEE 802-based system can be a unique 32-character identifier attached to a packet header sent over a WLAN. The SSID then acts as a password when a WTRU tries to connect to a BSS or a separate BSS. The SSID differentiates one WLAN from another, thus, all the base stations and all the devices that try to connect to a specific WLAN normally use the same SSID. Normally, a device will not be allowed to join a BSS unless it can provide the unique SSID. On a larger scale, a wide area wireless network (WWAN) can be provided to support communications between APs or other types of network base stations and user WTRUs. Cellular networks that operate at great distances are a type of WWAN. Typically, the APs provided in the WLAN / WWAN broadcast power restriction information that is used by all WTRUs that communicate with an AP to reduce the transmit power. The inventors have recognized that it would be desirable to provide decreasing / increasing transmission power of each WTRU and / or other connection or device, individually.

THE INVENTION The present invention is characterized by comprising a method and apparatus for use in wireless local area networks / wireless wide area networks (WLANs / WWANs) capable of providing transmission power information to wireless transmission / reception units (WTRUs). individual A transmission power level is preferably established based on previous transmission and reception statistics, such as signal-to-noise ratio (SNR), bit error rate (BER), frame error rate (FER) and / or Similar. The suitable power transmission information is preferably communicated to a particular WTRU in a header of either an acknowledgment (ACK), data, ready to send (CTS) or request to send (RTS) frame, designated for that WTRU. The computation of the power level can be made in an AP to control the transmission power of frames from an AP that are directed to the WTRU. The individual transmission power information may optionally be transported by an AP through a beacon frame that is adapted to include both WTRU identities and power control data of the target WTRUs, preferably in addition to an initial power control configuration for use, by the WTRU when they initiate communications for the first time. Alternatively, it provides one specifically designed for power control plot. However, it is preferable to communicate the power control information in a frame that is also used for other purposes, so as not to adversely affect the network performance. In one aspect of the invention, a wireless transmission unit (WTRU) has a transmitter configured to broadcast general power restriction messages to other WTRUs and an associated processor. The processor is preferably configured to determine a suitable power transmission level for a given WTRU and to insert data reflecting the convenient power transmission level together with identity data of said given WTRU in a communication frame. The transmitter is preferably configured to transmit communication frames including convenient power transmission level and identity data to allow said given WTRU to adjust the transmit power of wireless signals directed to the WTRU independently of the general power restriction message. Preferably, said WTRU is configured as an access point (AP) of a wireless local area network (WLAN) with its transmitter configured to broadcast the general power restriction messages in beacon frames. The processor of said AP can be configured to insert data that reflects the level of convenient power transmission, by inserting the appropriate power transmission-level data into beacon frames. Alternatively, the processor may be configured to insert data that reflects the convenient power transmission level, by inserting the appropriate power transmission level data into confirmation (ACK), data, ready to send (CTS) or requested frames for send (RTS) standards or in an individual control frame specifically designated for power control. Additionally, the AP processor may be configured to insert data into given bits in a physical layer convergence procedure (PLCP) header - to identify the convenient power transmission level data that is sent in the frame. Other alternatives include, the AP processor configured to insert data reflecting the convenient power transmission level, by inserting the appropriate power transmission level data into a Media Access Control (MAC) header. The AP processor may also be configured to insert data that reflects the level of AP transmission power in the communication frame, together with the convenient power transmission level and the identity data of said given WTRU. Preferably, the AP processor is configured to determine the convenient transmission power level using prior transmission and reception statistics by determining and storing data including at least one of noise ratio signal (SNR), bit error rate (BER) and frame error rate ( FER), power of transmission of signals received in the given WTRU, in addition to previous messages related to power levels of transmission and reception. In another aspect of the invention, a WTRU is configured for use in a wireless network with a receiver, a transmitter and an associated processor. The receiver is preferably configured to receive a broadcast of a general power restriction message from an access point (AP) of the wireless network. The receiver is preferably further configured to receive a communication frame from the AP with data reflecting a convenient power transmission level, together with identity data of the WTRU. The processor is preferably configured to receive broadcasting of general power restriction messages in beacon frames in a wireless local area network (WLAN). The transmitter of the WTRU may be configured to transmit a non-conforming adjustment message to the AP when the power processor setting of transmitting wireless signals to the AP based on the data received from it.

Convenient power transmission level is affected by certain WTRU criteria. In such a case, the WTRU processor is preferably configured to adjust the transmission power of wireless signals directed to the AP based on the data received from the transmission level of suitable power and based on at least one determined WTRU criterion between capacity of remaining battery, maximum power level, minimum power level and unsupported features. When the WTRU includes a battery to provide electrical power, the processor can be configured to adjust the transmission power of wireless signals to the AP, measuring the remaining battery power capacity and modifying the transmission power based on the received level data. of convenient power transmission and the remaining power capacity measured. In such a case, the processor is preferably configured to adjust the transmission power of wireless signals directed to the AP using the received data of convenient power transmission level with base for adjustment when the measured remaining power capacity of the battery is above a given threshold and using the data received from the appropriate power transmission level as a basis for adjustment and reducing the adjustment as a function of a difference in the remaining energy capacity measured and the given threshold when the Remaining power capacity of the battery is below the given threshold. The transmitter of the WTRU may then be configured to transmit a low battery message to the AP when the power setting is reduced. The WTRU processor may also be configured to determine a suitable AP power transmission level for AP transmissions to the WTRU and to insert data reflecting the appropriate AP power transmission level together with WTRU identity data in a communication frame. In such a case, the transmitter is configured to transmit the communication frame, whereby the AP is allowed to adjust the transmit power of wireless signals directed to the WTRU. Preferably, the WTRU processor is configured to insert data reflecting the appropriate AP power transmission level by inserting the appropriate AP power transmission level data into a data confirmation (ACK), ready to send ( CTS), order to send (RTS) or an individual control frame specifically designed for power control. Similarly, said WTRU processor may be configured to insert data, as discussed above for the example of an AP processor. Although the features and elements of the present invention are described in the preferred embodiment forms in particular combinations, each characteristic or The element can be used alone (without the other features and elements of the preferred embodiments) or in various combinations, with or without other features and elements of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be understood from the analysis of the drawings where similar elements are referenced through similar reference numbers, and where: Figure 1 is a simplified block diagram of a WLAN network. Figure 2 is a schematic diagram showing an example of the manner in which an AP generates and sends power transmission information. Figure 3 is a schematic diagram showing the manner in which a WTRU adjusts its power transmission output in response to power transmission information from an AP and the battery consumption of the WTRU. Figure 4 is a schematic diagram showing an example of the manner in which a WTRU generates and sends power transmission information.

DETAILED DESCRIPTION OF THE PREFERRED MODALITIES Figure 1 shows a wireless local area network / wireless wide area network (WLAN / WWAN) 10 that it comprises at least one AP and a plurality of wireless transmit / receive units (WTRUs), WTRU-1 to WTRU-N, which communicate therewith. Each AP is capable of transmitting power information to the WTRU within its communication range and each WTRU is likewise capable of transmitting power information to APs within its communication range. In existing standards, such as the IEEE 802. llh standard (Section 7.3.2.1.3), in local power restriction element is sent in a beacon frame by all APs. This local power restriction currently in use configures the transmit power of all WTRUs at the same value. The present invention distinguishes from this and is unique in providing an individual transmit power value for each WTRU, particularly in the context of WLANs / WWANs configured to operate in accordance with IEEE 802.11 standards. Figure 2 illustrates a method and apparatus of the present invention employed by an access point (AP) of a WLAN or WWAN. In step SI, the AP determines a power level for a given remote WTRU, where the power level is based on previous transmission and reception statistics, using information, such as signal-to-noise ratio (SNR), bit error rate (BER), frame error rate (FER) and / or the like. In step S2, the AP preferably inserts a power level data power restriction message for the given WTRU in a frame header of a frame, such as a confirmation (ACK), data, ready to send (CTS), or request to send ( RTS) that is directed to the specific WTRU. The AP, in step S3, transmits the frame including the power level data. The transmit power level data may take the form of a power restriction message and / or may be the actual transmit power, a transmit power amount less than a maximum power or greater than a minimum power or an increase / decrease in the last transmission power transmitted. As an example, in a physical layer convergence procedure (PLCP) header, eight (8) bits are reserved for service. These bits are used to indicate that power control information is sent in the frame. At first few bits of the data part of the frame are used to send the power control information. The AP is preferably configured to transmit such frames with power control information, and the WTRUs are preferably configured to receive such frames and detect the power control information in said frame. The individual transmission power data can optionally be inserted by an AP in a beacon frame that is adapted to include both identities .WTRU as power control data of the target WTRUs with which the AP communicates. Regardless of whether this option is used or not, the AP is preferably configured to broadcast beacon frames that include an initial power control configuration for use by the WTRUs when initiating communications for the first time. Accordingly, the WTRUs are preferably configured to use only the initial power control configuration of received beacon frames, if the WTRU has not received individual transmit power data from the AP. Alternatively, a specific signal is provided for a power control frame where the power control information is inserted. However, it is preferable to communicate the power control information in a frame that is also used for other purposes, so as not to adversely affect the network performance. APs with an adaptive or intelligent antenna capability can very advantageously utilize the present invention, which allows for the use of lower power control information due to the improved capacity of the AP antenna, which, when present, is factored into the transmission characteristics (TX). In addition, WTRUs are provided with a power control algorithm to adjust the power level, taking into account the battery consumption, as well as the power consumption.

Power control information from the AP. A preferred operational configuration for a WTRU employing the teachings of the invention is illustrated in Figure 3. The WTRU, after receiving a designated frame including the power transmission information, in step SI, extracts the level-level message. power, in S2, and, in step S3, it measures the consumption of the battery. The WTRU, in step S4, is preferably configured to adjust its transmission power level taking into account both the received power transmission information and the data related to the battery that it measures. Preferably, in step S4, the WTRU uses the transmission power level derived from the AP, but reduces that power level when the measured level of the battery is below a given threshold. The amount of reduction of the transmission power level is preferably calculated as a function of lower battery level rise below the threshold. The results of the adjustments made, in step S4, are stored, in step S5, for use in future power level adjustments. As noted above, a WTRU can provide power level data to an AP to control the power of AP transmissions directed to that WTRU. A preferred operational configuration for said WTRU measures the consumption of the battery. In step S7, the WTRU determines a power level based on data of previous reception that they include one or more between BER, FER, SNR, etc., but modify this information to increase the power level determined when the measured level of the battery is below a given threshold. The corresponding power level data is then sent to the AP, in step S8. The AP uses this information to determine the power level for communications with the WTRU. The AP may also use this information to determine its transmission power for communications with other WTRUs and / or calculate the power level data to be sent to the WTRUs to control their respective transmission powers. To carry out the descriptive functions above, the WTRU is configured with an apparatus that incorporates a receiver with an antenna configured to receive the defined frames transmitted by the AP. When modulated signals are transmitted, the receiver is preferably configured with a demodulator to reduce the received signals to the baseband. In addition, the WTRU is preferably configured with an apparatus for extracting the targeted power restriction signal. For battery-operated WTRUs, a sensor that is configured to measure energy capacity of the WTRU battery source is preferably provided. In addition, the WTRU preferably includes a transmitter with a power level based on either a message of Modified power restriction in accordance with the power capacity of a portable power source, when such information is available. The controller may further be configured to modify the power level setting of one of a plurality of levels based on the magnitude of the difference between the maximum remaining power capacity in a battery source and the measured power capacity or the difference between a preset threshold and the measured energy capacity. The WTRU controller is preferably configured to store a measured energy capacity reading and generate a power level message that is forwarded to an AP as part of an ACK or RTS frame. The WTRU receiver may also be configured to measure the power level of a beacon frame, the reading of which is then stored. The WTRU controller is then preferably configured to provide the transmitter with the power level measured as part of or in addition to the power level in the WTRU identification message transmitted to the AP. The AP is preferably configured with a receiver to receive the WTRU message and convert the message to baseband. An AP controller is preferably configured to generate a power level restriction message based on information in messages received from a WTRU and previously stored source data and provide data of power level in the form of a power restriction message to an AP transmitter. In addition, the AP is preferably configured to insert the power restriction message into a data frame, CTS, RTS or ACK and to insert data into a PLCP header to identify the power restriction message that is sent in the frame , together with an identity code to identify the WTRU destined to receive the frame and the associated power restriction message. WRTUs and APs can reverse their roles and WTRUs can use the techniques set forth above to provide information equivalent to a power restriction message to assist the AP in its transmissions. Although the features and elements of the present invention are described in the preferred embodiment forms in particular combinations, each feature or element can be used alone (without the other features and elements of the preferred embodiments) or in various combinations, with or without other features. and elements of the present invention.

Claims (69)

1. CLAIMS 1. Method used by an access point (AP) of a wireless network to control the transmission power of wireless transmission / reception units (WTRUs) selected as a target, a method characterized in that it comprises: determining a suitable power transmission level for a given WTRU; insert data that reflects the determined power transmission level determined, together with identity data of said given WTRU in a communication frame? and transmitting said communication frame, whereby said given WTRU is allowed to adjust the transmission power of wireless signals directed to the AP.
2. 2. Method according to claim 1, characterized in that the determination of the level of transmit power and previous reception, determining and storing data including at least one of relationship between signal and noise (SNR), bit error rate (BER), frame error rate (FER), power of transmission of signals received from the WTRU given, in addition to previous messages related to power levels of transmission and reception.
3. Method according to claim 2, characterized in that the AP has an adjustable antenna and the determination of the convenient transmission power level includes modifying the level of convenient transmission power in response to an adjustment of said adjustable antenna.
4. 4. Method according to claim 1, further characterized in that it comprises: Inserting data in given bits of a physical layer convergence procedure (PLCP) header to identify the power control information that is sent to the frame.
5. 5. Method according to claim 1, characterized in that the insertion of data reflecting the determined convenient power transmission level includes inserting data of convenient power transmission level into a given number of initial bytes of a data part of the plot.
6. Method used by a wireless transmission / reception unit (WTRU) in a wireless network, characterized in that it comprises: broadcasting a general power restriction message to other WTRUs; determining a suitable power transmission level for a given WTRU; inserting data that reflects the level of convenient power transmission, together with identity data of said given WTRU in a communication frame; and transmitting said communication frame, whereby said given WTRU is allowed to adjust the transmission power of wireless signals directed to the WTRU, independently of the general power restriction message.
7. Method according to claim 6, characterized in that the WTRU is an access point (AP) of a wireless local area network (WLAN) and broadcasting of a general power restriction message by the AP in beacon frames is carried out.
8. Method according to claim 7, characterized in that the insertion of data that 'reflects the level of convenient power transmission includes inserting data of convenient power transmission level into the beacon frames.
9. 9. Method according to claim 7, characterized in that the insertion of data reflecting the level of power transmission convenient in a confirmation frame (ACK), data, ready to send (CTS) or requested to send (RTS) .
10. Method according to claim 9, further characterized in that it comprises inserting data into given bits in a physical layer convergence procedure (PLCP) header to identify the convenient power transmission level data that is sent in the frame.
11. Method according to claim 9, characterized in that the insertion of data reflecting the convenient power transmission level includes inserting data of convenient power transmission level into a given number of initial bytes of a data part of the frame .
12. 12. Method according to claim 9, characterized in that the insertion of data reflecting the convenient power transmission level includes inserting the appropriate power transmission level data into a Media Access Control (MAC) header.
13. 13. Method according to claim 9, characterized in that it further comprises the insertion of data that reflects the level of AP transmission power in the communication frame, together with the level of convenient power transmission and identity data of said WTRU Dadaist.
14. Method according to claim 7, characterized in that the convenient transmission power level includes using previous transmission and reception statistics, determining and storing data including at least one of signal-to-noise ratio (SNR), error rate of bits (BER), frame error rate (FER), transmission power of signals received from the given WTRU, in addition to previous messages related to transmission and reception power levels.
15. Method according to claim 7, characterized in that the insertion of data reflecting the convenient power transmission level includes inserting the appropriate power transmission level data into an individual control frame specifically designated for power control.
16. 16. Method of wireless communication for a wireless transmission / reception unit (WTRU) in a wireless network, characterized in that it comprises: receiving a broadcast of a general power restriction message from an access point (AP) of the wireless network; establish a wireless communication partnership with the AP; receiving a communication frame from the AP with data reflecting a convenient power transmission level, together with identity data of the WTRU; and adjusting the transmission power of wireless signals directed to the AP based on the received data of convenient power transmission level, independently of the general power restriction message.
17. Method according to claim 16, characterized in that the broadcasting of a general power restriction message is received in beacon frames in a wireless local area network (WLAN).
18. 18. Method according to claim 16, characterized in that the WTRU is energized by a battery and the transmission power setting of wireless signals directed to the AP further comprises: measuring the remaining battery power capacity; and modifying the transmission power based on the received data of convenient power transmission level and the remaining power capacity measured.
19. 19. Method according to claim 18, characterized in that the adjustment of the transmit power of wireless signals to the AP includes using the received data of a suitable power transmission level as a basis for adjustment when the measured remaining power capacity of the battery is above a given threshold.
20. 20. Method according to claim 19, characterized in that the adjustment of transmit power of wireless signals to the AP includes using the received data of convenient power transmission level as a basis for adjustment and reducing the adjustment as a function of a difference. of the remaining energy capacity measured and the given threshold when the remaining energy capacity measured from the battery is below the given threshold.
21. 21. Method according to claim 20, characterized in that it further comprises transmitting a low battery message to the AP when the power setting is reduced.
22. 22. Method according to claim 16, characterized in that it further comprises transmitting an adjustment message of non-conformed to the AP when the transmission power setting of wireless signals directed to the AP based on the received data of convenient power transmission level. it is effected by certain criteria of WTRU.
23. 23. Method according to claim 22, characterized in that the adjustment of transmission power of wireless signals directed to the AP based on the data received from a suitable power transmission level is also based on at least one determined WTRU criterion between remaining battery capacity, maximum power level, minimum power level and unsupported characteristics.
24. 24. Method according to claim 16, characterized in that it further comprises: determining a suitable AP power transmission level for AP transmissions to the WTRU; insert data reflecting the appropriate AP power transmission level, together with identity data of the WTRU in a communication frame; and transmitting said communication frame, whereby the AP is allowed to adjust transmit power of wireless signals directed to the WTRU.
25. Method according to claim 24, characterized in that the insertion of data reflecting the level of power transmission of suitable APs includes inserting the data of power transmission level of suitable AP in a confirmation frame (ACK), of data, ready to send (CTS). or order to send (RTS).
26. 26. Method according to claim 25, characterized in that it further comprises inserting data in given bits of a physical layer convergence procedure header. (PLCP) to identify the appropriate AP power transmission level data that is sent in the frame.
27. 27. Method according to claim 25, characterized in that the insertion of data reflecting the power transmission level of convenient AP includes inserting the data of convenient power transmission level into a given number of initial bytes of a data part of the plot.
28. Method according to claim 25, characterized in that the insertion of data reflecting the suitable power transmission level of AP includes inserting the data of power transmission level of suitable AP in a header of Access Control to the Media (MAC).
29. 29. Method according to claim 24, characterized in that the determination of the suitable AP transmission power level includes using prior transmission and reception statistics, determining and storing data including at least one signal-to-noise ratio (SNR). , bit error rate (BER), frame error rate (FER), transmission power of signals received from the AP, in addition to previous messages related to transmission and reception power levels.
30. 30. Method according to claim 24, characterized in that the insertion of data reflecting the power transmission level of suitable AP includes inserting the power transmission level data. convenient in an individual control frame specifically designed for power control.
31. 31. Method of wireless communication for a wireless transmission / reception unit (WTRU) in a wireless network, characterized in that it comprises: receiving a broadcast of a general power restriction message from an access point (AP) of a wireless network of local area (WLAN); establish a wireless communication partnership with the AP; determine a suitable AP power transmission level for AP transmissions to the WTRU; inserting data reflecting the appropriate AP power transmission level, together with identity data of the WTRU in a communication frame, and transmitting said communication frame, whereby the AP is allowed to adjust the signal transmission power wireless to the WTRU.
32. 32. Method according to claim 31, characterized in that the insertion of data reflecting the power transmission level of the suitable AP includes inserting the appropriate power transmission level data of AP in a confirmation frame (ACK), of data, ready to send (CTS) or order to send (RTS).
33. 33. Method according to claim 32, characterized in that it further comprises inserting data in given bits of a layer convergence procedure header Physical (PLCP) to identify the data of convenient AP power transmission level that are sent in the frame.
34. 34. Method according to claim 32, characterized in that the insertion of data reflecting the power transmission level of convenient AP includes inserting the data of convenient power transmission level into a given number of initial bytes of a data part. Of the plot.
35. 35. Method according to claim 32, characterized in that the insertion of data reflecting the power transmission level of convenient AP includes inserting the data of convenient power transmission level in a Media Access Control header (MAC ).
36. 36. Method according to claim 31, characterized in that the determination of the suitable AP transmission power level includes using previous transmission and reception statistics, determining and storing data including at least one of signal-to-noise ratio. (SNR), bit error rate (BER), frame error rate (FER), power of transmission of signals received from the AP, in addition to previous messages related to power levels of transmission and reception.
37. 37. Method according to claim 31, characterized in that the insertion of data reflecting the suitable AP power transmission level includes inserting the appropriate power transmission level data into an individual control frame specifically designated for power control.
38. 38. Wireless transmission / reception unit (WTRU) configured for use in a wireless network, characterized in that it comprises: a transmitter configured to broadcast general power restriction messages to other WTRUs, a processor configured to determine a suitable power transmission level for a given WTRU and for inserting data that reflects the convenient power transmission level, together with identity data of said WTRU in a communication frame; and said transmitter configured to transmit communication frames including convenient power transmission level and identity data to allow said WTRU to adjust the transmit power of wireless signals directed to -the WTRU, independent of the general power restriction message.
39. 39. WTRU according to claim 38, configured as an access point (AP) of a wireless local area network (WLAN), characterized in that said transmitter is configured to broadcast the general power restriction messages in beacon frames.
40. 40. AP according to claim 39, characterized in that said processor is configured to insert data reflecting the convenient power transmission level by inserting the appropriate power transmission level data into beacon frames.
41. 41. AP according to claim 39, characterized in that said processor is configured to insert data that reflects the level of convenient power transmission in a confirmation (ACK), data, ready to send (CTS) or requested to send frame. (RTS).
42. 42. AP according to claim 41, characterized in that said processor is configured to insert data into given bits of a physical layer convergence procedure (PLCP) header to identify the convenient power transmission level data that is sent in the plot.
43. 43. AP according to claim 41, characterized in that said processor is configured to insert data that reflects the level of convenient power transmission by inserting the data of convenient power transmission level into a given number of the initial bytes of a part of data of the plot.
44. 44. AP according to claim 41, characterized in that said processor is configured to insert data that reflects the level of convenient power transmission by inserting the transmission level data of Convenient power in a Media Access Control (MAC) header.
45. 45. AP according to claim 41, characterized in that said processor is configured to insert data reflecting the level of AP transmission power in the communication frame, together with the convenient power transmission level and identity data of said WTRU given.
46. 46. AP according to claim 39, characterized in that said processor is configured to determine the level of convenient transmission power using prior transmission and reception statistics, determining and storing data including at least one of signal-to-noise ratio (SNR). ), bit error rate (BER), frame error rate (FER), transmission power of signals received from the given WTRU, in addition to previous messages related to transmission and reception power levels.
47. 47. AP according to claim 39, characterized in that said processor is configured to insert data reflecting the convenient power transmission level by inserting the data of convenient power transmission level into an individual control frame specifically designated for power control. .
48. 48. Wireless transmission / reception unit (WTRU) for use in a wireless network, characterized in that it comprises: a receiver configured to receive a broadcast of a general power restriction message from an access point (AP) of the wireless network; said receiver configured to receive a communication frame from the AP with data reflecting a convenient power transmission level, together with identity data of the WTRU; and a transmitter with an associated processor configured to adjust the transmit power of wireless signals directed to the AP based on the received data of convenient power transmission level, independently of the general power restriction message.
49. 49. WTRU according to claim 48, characterized in that the receiver is configured to receive broadcasting of general power restriction messages in beacon frames in a wireless local area network (WLAN).
50. 50. WTRU according to claim 49, characterized in that it also comprises a battery for providing electrical power and characterized in that said processor is configured to adjust the transmission power of wireless signals directed to the AP, measuring the remaining battery power capacity and modifying the transmission power based on the received data of convenient power transmission level and the remaining power capacity measured.
51. 51. WTRU according to claim 50, characterized in that said processor is configured to adjust the transmission power of wireless signals directed to the AP using the received data of convenient power transmission level as a basis for adjustment when the remaining power capacity measured from the battery is above a given threshold.
52. 52. WTRU according to claim 51, characterized in that said processor is configured to adjust the transmission power of wireless signals directed to the AP, using the received data of convenient power transmission level as a basis for adjustment and reducing the adjustment as a function of a difference of the remaining energy capacity measured and the given threshold when the remaining energy capacity measured from the battery is below the given threshold.
53. 53. WTRU according to claim 52, characterized in that said transmitter is configured to transmit a low battery message to the AP when the power setting is reduced.
54. 54. WTRU according to claim 48, characterized in that said transmitter is configured to transmit a non-conforming adjustment message to the AP when said transmit power setting of wireless signals directed to the AP based on the data received from a convenient power transmission level is affected by certain WTRU criteria.
55. 55. WTRU according to claim 54, characterized in that said processor is configured to adjust the transmission power of wireless signals directed to the AP based on the received data of convenient power transmission level and based on at least one determined criterion. of WTRU between remaining battery capacity, maximum power level, minimum power level and unsupported features.
56. 56. WTRU according to claim 48, characterized in that said processor is configured to determine a suitable AP power transmission level for AP transmissions to the WTRU and to insert data reflecting the appropriate AP power transmission level, together with identity data of the WTRU in a communication frame and because said transmitter is configured to transmit said communication frame, whereby the AP is allowed to adjust the transmission power of wireless signals directed to the WTRU.
57. 57. WTRU according to claim 56, characterized in that said processor is configured to insert data reflecting the power transmission level of suitable AP, by inserting the data of power transmission level of suitable AP into a confirmation frame. (ACK), data, ready to send (CTS) or order to send (RTS).
58. 58. WTRU according to claim 57, characterized in that said processor is configured to insert data into given bits of a physical layer convergence procedure (PLCP) header to identify the convenient power transmission level data that is sent in the plot.
59. 59. WTRU according to claim 57, characterized in that said processor is configured to insert data reflecting the power transmission level of suitable AP, inserting the data of convenient power transmission level into a given number of the initial bytes of a part of the plot data.
60. 60. WTRU according to claim 57, characterized in that said processor is configured to insert data reflecting the appropriate AP power transmission level, inserting the appropriate AP power transmission level data into an Access Control header. to the Media (MAC).
61. 61. WTRU according to claim 56, characterized in that said processor is configured to determine the appropriate AP transmission power level, using prior transmission and reception statistics, determining and storing data including at least one of a signal-to-noise ratio (SNR), bit error rate (BER), frame error rate (FER), transmit power of signals received from the AP, in addition to previous messages related to power levels of transmission and reception.
62. 62. WTRU according to claim 56, characterized in that said processor is configured to insert data reflecting the power transmission level of suitable AP, inserting the data of convenient power transmission level into an individual control frame specifically designated for power control.
63. 63. Wireless transmission / reception unit (WTRU) for use in a wireless network, characterized in that it comprises: a receiver configured to receive a broadcast of a general power restriction message from an access point (AP) of the wireless network; a processor configured to determine a suitable AP power transmission level for the given WTRU and to insert data reflecting the appropriate AP power transmission level, together with identity data of the WTRU in a communication frame; and a transmitter configured to transmit said communication frame, whereby the AP is allowed to adjust the transmit power of wireless signals directed to the WTRU.
64. 64. WTRU according to claim 63, characterized in that said processor is configured to insert data reflecting the appropriate AP power transmission level, by inserting the appropriate AP power transmission level data into a data ready, confirmation (ACK) frame (CTS). ) or order to send (RTS).
65. 65. WTRU according to claim 64, characterized in that said processor is configured to insert data into given bits of a physical layer convergence procedure (PLCP) header to identify the appropriate AP power transmission level data that are sent in the plot.
66. 66. WTRU according to claim 64, characterized in that said processor is configured to insert data reflecting the power transmission level of suitable AP, inserting the data of convenient power transmission level into a given number of the initial bytes of a part of the plot data.
67. 67. WTRU according to claim 64, characterized in that said processor is configured to insert data that reflects the power transmission level of convenient AP, by inserting the data of power transmission level of suitable AP in an Access Control header. to the Media (MAC).
68. 68. WTRU according to claim 63, characterized in that said processor is configured to determine the appropriate AP transmission power level, using prior transmission and reception statistics, determining and storing data including at least one signal to noise ratio (SNR), bit error rate (BER), frame error rate (FER), transmission power of signals received from the AP, in addition to previous messages related to power levels of transmission and reception.
69. 69. WTRU according to claim 63, characterized in that said processor is configured to insert data reflecting the power transmission level of suitable AP, inserting the data of convenient power transmission level into an individual control frame specifically designated for power control.