WO2010038094A1 - Communication sans fil au moyen d'une politique de performance - Google Patents

Communication sans fil au moyen d'une politique de performance Download PDF

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Publication number
WO2010038094A1
WO2010038094A1 PCT/IB2008/002580 IB2008002580W WO2010038094A1 WO 2010038094 A1 WO2010038094 A1 WO 2010038094A1 IB 2008002580 W IB2008002580 W IB 2008002580W WO 2010038094 A1 WO2010038094 A1 WO 2010038094A1
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WO
WIPO (PCT)
Prior art keywords
module
performance profile
response
receiver
transmission power
Prior art date
Application number
PCT/IB2008/002580
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English (en)
Inventor
Mikko Olavi VÄÄRÄKANGAS
Original Assignee
Nokia Corporation
Nokia Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Corporation, Nokia Inc. filed Critical Nokia Corporation
Priority to PCT/IB2008/002580 priority Critical patent/WO2010038094A1/fr
Publication of WO2010038094A1 publication Critical patent/WO2010038094A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0245—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal according to signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • Example embodiments relate to wireless communication, and for example, to performance reduction in wireless communication devices.
  • GSM Global System for Mobile Communications
  • SMS allows a wireless communication device (WCD) to transmit and receive text messages.
  • MMS Multimedia Messaging Service
  • MMS an enhanced messaging system allowing for the transmission of sound, graphics and video files in addition to simple text, has also become available in certain devices.
  • Short-range wireless networks provide communication solutions that avoid some of the problems seen in larger cellular networks.
  • BluetoothTM is an example of a short- range wireless technology quickly gaining acceptance in the marketplace.
  • a 1 Mbps BluetoothTM radio may transmit and receive data at a rate of 720 Kbps within a range of 10 meters, and may transmit up to 100 meters with additional power boosting.
  • EDR Enhanced Data Rate
  • WLAN Wireless Universal Serial Bus
  • UWB Ultra Wideband
  • ZigBee IEEE 802.15.4
  • the IEEE 802.11 Wireless LAN Standards describe two major components, a wireless device, called a station (STA), and a fixed device, called an access point (AP).
  • the AP may perform the wireless-to-wired bridging from STAs to a wired network.
  • the basic network is the basic service set (BSS), which is a group of wireless devices that communicate with each other.
  • BSS basic service set
  • An infrastructure BSS is a network that has an AP as an essential node.
  • IBSS independent basic service set
  • the basic approach is similar to the infrastructure BSS case whereas one STA is operating as an access point.
  • Wireless LAN (WLAN) devices use only a standard doze state based power saving, wherein the device goes into a sleep state if the device knows that there will be no data available from the AP or host. In an active mode, the device consumes power at a constant rate regardless of any required link budget and signal to noise ratio. In many cases radio specifications have a significant amount of performance overhead, which leads to higher energy consumption.
  • Example embodiments may decrease performance in wireless LAN devices by utilizing a reconfigurable radio modem, which is reconfigured in response to information in both the modem and a host of the subsystem.
  • the modem may include performance reduction logic.
  • An interface connects the modem to the host's control logic. The interface enables the host to control several different implementations of adjustable modem structures.
  • the host sets a performance profile / policy based approach for the modem's control logic.
  • the performance profile /policy describes how sensitive the local control should be in cases of lost packets, detected changes in environment, or other parameters that may affect performance.
  • the performance profile / policy may describe the threshold at which a lower energy state should transition back to a normal operating state where the receiver resumes listening with full sensitivity.
  • the performance profile may be an index number.
  • the performance profile may have one ore more other parameters, e.g., how many missed packets may occur or by how much radio channel quality metrics may change before state change.
  • Example embodiments are disclosed to adjust performance in a transmitter by adjusting transmission power.
  • Example embodiments are based on a performance profile / policy based approach, which may be a power save abstraction layer.
  • transmission power levels are adjusted, depending on the current performance profile and the related parameters, e.g. a transmit-policy signal-to-noise ratio limit and/or a transmit-policy error limit.
  • the performance profile / policy based approach may define the allowable packet error rate and/or an allowable signal-to-noise (SNR) value.
  • SNR allowable signal-to-noise
  • Example embodiments are disclosed to adjust performance in a receiver by changing sensitivity in the receiver, for example, by adjusting the analog to digital converter (ADC) portion of the receiver.
  • a bit-width of the ADC may be reduced to change sensitivity.
  • the sensitivity change may be based on the performance profile / policy based approach, different settings / reconfigurations are performed depending on the current performance profile and the related parameters.
  • the parameters may define an allowable packet error rate and/or an allowable signal-to-noise ratio (SNR) value or other receiver parameters.
  • SNR signal-to-noise ratio
  • the performance profile is controlled by the host and the execution of the performance adjustment mechanism is performed autonomously in the modem based on the performance profile.
  • Example embodiments may include three parts: the modem, the interface, and/or the host.
  • the modem which may be a separate chipset, has an inbuilt, sensitivity adjustment based, performance reduction scheme, which is controlled by the host via the common interface.
  • Performance adjustment may be implemented in various ways.
  • An example embodiment may include an analog-to-digital converter (ADC) resolution-based approach wherein fewer converted bits results in less consumed power.
  • Another example embodiment may include reducing the noise figure of the radio frequency (RF) front-end.
  • Still another example embodiment may place the more primary ADCs into a sleep state while the channel state is monitored before packet transmission.
  • the above performance adjustment implementations may be used in combination.
  • the modem may include one or more modules including the control for the control for receiver sensitivity, the control for transmission power, the receiver, and/or the transmitter.
  • Example embodiments separate the control into real-time control (or run-time control) of the modem and overall performance policy control by the host.
  • the host will set guidelines via the interface as to how the real-time logic in the modem is to operate.
  • the local control at the modem requires usage dependent knowledge.
  • An example is two devices connected via an ad hoc connection.
  • Channel state estimation in a conventional WLAN system may be relatively inaccurate and there may be a lag in communication between the modem and the host.
  • example embodiments may improve accuracy and decrease lag through local control at the modem, which adapts independently and more rapidly to faster changes in the radio environment.
  • a method may include receiving a performance profile in a module.
  • Receiver sensitivity levels for a wireless receiver in the module may be determined in response to the performance profile.
  • Sensitivity levels for the wireless receiver in the module may be controlled in response to the determined receiver sensitivity levels.
  • a method may include receiving a performance profile in a module.
  • a transmission power for a wireless transmitter in the module may be determined in response to the performance profile. Transmission power for the wireless transmitter in the module may be controlled in response to the determined transmission power.
  • An apparatus may include a module and/or a processor.
  • the module may include a wireless receiver and/or be configured to receive a performance profile.
  • the processor may be configured to determine receiver sensitivity levels for the wireless receiver in response to the performance profile and to control sensitivity levels for the wireless receiver in response to the determined receiver sensitivity levels.
  • An apparatus may include a module and/or a processor.
  • the module may include a wireless transmitter and/or be configured to receive a performance profile.
  • the processor may be configured to determine a transmission power for the wireless transmitter in response to the performance profile and to control transmission power for the wireless transmitter in response to the determined transmission power.
  • FIG. 1 illustrates an external view and a functional block diagram of an example embodiment of a wireless device
  • FIG. 2 illustrates a block diagram of control logic of a device according to an example embodiment
  • Fig. 3 shows an example state diagram of receiver control in response to a receive policy
  • Fig. 4 shows an example state diagram of transmitter control in response to a transmit policy
  • Fig. 5 illustrates an external view and a functional block diagram of an example embodiment of a modem
  • Fig. 6 illustrates a block diagram of an example interface between a host and a modem according to an example embodiment
  • Fig. 7 shows an example state diagram for setting parameters of receiver control
  • FIG. 8 shows an example state diagram for setting parameters of transmitter control.
  • Fig. 1 illustrates an external view and a functional block diagram of an example embodiment of a wireless device 10OA.
  • the wireless device IOOA may be a communications device, PDA 5 cell phone, mobile terminal, laptop or palmtop computer, or any other apparatus.
  • the wireless device IOOA may include a control module 220, which includes a central processing unit (CPU) 260, a random access memory (RAM) 262, a read only memory (ROM) 264, and/or interface circuits 266 to interface with a radio transmitter 212, receiver 214, battery and other power sources, key pad, touch screen, display, microphone, speakers, ear pieces, camera or other imaging devices, etc. in the device IOOA.
  • CPU central processing unit
  • RAM random access memory
  • ROM read only memory
  • the central processing unit 260 may be a complex logic module, an ASIC, or an instruction processor.
  • the RAM 262 and ROM 264 may be removable memory devices, e.g., smart cards, subscriber identification modules (SIMs), wireless identity modules (WIMs), semiconductor memories, (e.g., RAM, ROM, programmable read only memory (PROM), flash memory devices), etc.
  • the wireless device IOOA includes, for example, an internet protocol stack that includes a user's application program 203 at the top, and from the application program 203 to the bottom of the stack a Transmission Control Protocol (TCP) transport layer 204, an Internet Protocol (IP) layer 205, an upper Media Access Control (MAC) layer 206, an interface 208, a lower Media Access Control (MAC) layer 210, and/or the radio physical layer comprising the transmitter (TX) 212 and the receiver (RX) 214 at the bottom of the protocol stack.
  • the Media Access Control (MAC) layers 206 and 210 may be an IEEE 802.11 MAC layer, for example, which provides functionality to allow reliable data delivery for the upper layers over the wireless medium.
  • the device may support other upper layer protocols, e.g., User Datagram Protocol (UDP).
  • the wireless device might operate as station (STA) or as access point in a WLAN network.
  • Fig. 2 illustrates a block diagram of control logic of a device according to an example embodiment.
  • Example embodiments of the device IOOA may include: modem 202, interface 208, and/or host 200.
  • the host 200 of the wireless device IOOA may include communication layers from the upper media access control (MAC) layer 206 upwards to the application layer 203 as shown by Fig 1.
  • MAC media access control
  • Fig. 5 illustrates an external view and block diagram of an example embodiment of the modem 202.
  • the modem 202 which may be a separate chipset, may have a vendor specific implementation of the lower MAC layer 210, and/or the radio physical layer comprising at least one transmitter 212 and/or at least one receiver 214 at the bottom of the protocol stack.
  • the modem 202 may include a CPU 560, a RAM 562, and/or a ROM 564.
  • the CPU 560 may be a complex logic module, an ASIC, or an instruction processor.
  • the ROM may be a removable ROM, flash memory or EPROM.
  • the interface 208 connects the modem 202 part to the host's 200 control logic.
  • the interface 208 enables the host 200 to control various different implementations of adjustable modem 202 structures or may be used for any other data communication.
  • the modem 202 may have inbuilt transmission power adjustment and receiver sensitivity adjustment, which are controlled by the host 200 of Fig 1 via the interface 208.
  • the modem 202 may include a transmission module including the transmission power adjustment control and/or the transmitter 212, a receiver module including the receiver sensitivity adjustment control and/or the receiver 214, or a transmitter/receiver module including the transmission power adjustment control, the receiver sensitivity adjustment control, and/or the transmitter 212 and receiver 214.
  • Fig. 5 illustrates an example embodiment of the modem 202; however, example embodiments are not limited thereto and the modem 202 may have various other configurations.
  • the control logic of host 200 may include an input- to-output mapping algorithm.
  • the host 200 may assign parameters or parameter ranges to independent local control entities at the modem 202, e.g., in the module or modules of the modem 202.
  • parameter groups may include transmission rate, transmission power, scheduler control, scanning/handover control, and/or receiver dynamic range.
  • the host 200 may set the parameter groups based on information that is available to the host 200 from a terminal energy manager, applications, location information, sensors, (e.g., acceleration sensor), and/or information from the modem 202.
  • the host 200 and the modem 202 may exchange information via the interface 208, which may be a WLAN HAL application program interface (API).
  • API application program interface
  • the modem 202 may include various local functions, for example, a rate algorithm (RA_Modem), scan/handover control (S/HC_Modem), transmission power control (TPC Modem), receiver dynamic range control (RDR_Modem), and/or a scheduler (SCH_Modem).
  • RA_Modem rate algorithm
  • S/HC_Modem scan/handover control
  • TPC Modem transmission power control
  • RDR_Modem receiver dynamic range control
  • SCH_Modem scheduler
  • the local functions/control entities in the modem 202 which may be flexibly controlled and optimized depending on an operating context and environment, may be implemented with separate and/or different run-time controls.
  • the various local functions in the modem 202 may make independent decisions, and parameter changes by one of the local functions in the control logic of the modem 202 need not affect other local functions in the modem 202. However, the control logic may make parameter changes to some, all, or none of the local functions.
  • the local control logic in the modem 202 may have input parameters, which may be common, and the input parameters may be used to make operating decisions at run-time. Cross optimization of parameters may be performed by the host 200, and the host 200 may set a separate policy that is a guideline for local control in the modem 202. After the local control in the modem 202 receives a policy from the host 200, the local control changes internal decision limits or similar parameters according to the policy. Alternatively, cross-optimized operating modes in the modem 202 may be selected using a performance profile / policy based approach (PerformID) as a group selection parameter. Accordingly, the modem 202 sets each control parameter of the local functions as specified in the PerformID.
  • Fig. 2 illustrates example embodiments of control logic for the device 10OA; however, example embodiments are not limited thereto and the device IOOA may include various other types of control logic / functions and/or interfaces between host 200, interface 208, and modem 202.
  • Fig. 6 illustrates a block diagram of an example interface between a host and a modem according to an example embodiment.
  • An interface 608 between a modem 602, which may have a hardware platform specific access interface, and the host 600, which may be a WLAN host driver, may be based on adaptation layer software, which may be specific to the modem 602.
  • the adaptation layer software for example a WLAN HAL API (WHA) layer, may run on the host 600, and the host 600 may implement the WHA layer as the interface 608.
  • the host 600 may receive the device specific adaptation layer software from the modem 602.
  • the interface 608 may convert the logical operations defined by the host 600 to device specific operations of the modem 602 and transport the converted logical operations to the modem 602.
  • WHA WLAN HAL API
  • the interface 608 may convert the device specific operations of the modem 202 to the logical operations defined by the host 600 and transport the converted device specific operations to the host 600.
  • the interface 608 may hide the device specific messaging, e.g., the real-time control, of the modem 602 from the host 600, which may allow the host 600 to handle only the logical operations, (e.g., host 600 needs only to set guidelines via the interface 608 as to how the real-time logic is to operate).
  • Fig. 6 illustrates example embodiments for a WLAN system; however, example embodiments are not limited thereto and may be employed in other networks or systems.
  • control module 220, internet protocol stack layers 204 to 210, and/or application program 203 and transmitter 212 and/or receiver 214 may be embodied as program logic stored in the RAM 262 and/or ROM 264 in the form of sequences of programmed instructions which, when executed in the CPU 260, carry out the functions of example embodiments.
  • the program logic may be delivered to the writeable RAM, programmable read-only memory (PROM), flash memory devices, etc. 262 of the wireless device IOOA from a computer program product or article of manufacture in the form of computer-usable media, e.g., resident memory devices, smart cards or other removable memory devices, or in the form of program logic transmitted over any transmitting medium which transmits programs.
  • control module 220 internet protocol stack layers 204 to 210, application program 203, and/or transmitter 212 and/or receiver 214 may be embodied as integrated circuit logic in the form of programmed logic arrays or custom designed application specific integrated circuits (ASIC). Each part may be combined in one or several integrated circuits or using CPUs.
  • the radio transmitter 212 and receiver 214 in wireless device IOOA may be configured to handle one or multiple channels in a relatively high speed, time and frequency multiplexed manner in response to the control module 220.
  • the control in device IOOA may be divided into two parts.
  • Real-time control may be located at the modem 202, and the host 200 may set guidelines via the interface 208 as to how the real-time logic is to operate, to avoid performance drawbacks.
  • the local control at the modem may be included in the one or more modules of the modem, which may also include the transmitter 212 and/or the receiver 214.
  • the local control at the modem 202 may require usage dependent information.
  • An example is two devices connected via an ad hoc connection.
  • Channel state estimation in a WLAN system may not be very accurate and a lag in communication between the modem 202 and the host 200 may exist. Therefore, local control at the modem 202 is able to adapt independently and faster to rapid changes in the radio environment.
  • the host 200 sets a performance profile / policy based approach (PerformID) in a policy register 215 for the modem 202 's control logic.
  • Combined or dedicated policy registers may be available for the transmitter 212 and/or receiver 214.
  • Combined or dedicated registers per each receiver and/or transmitter may be available if more than one receiver 214 and/or transmitter 212 are available.
  • PerformID describes how sensitive the local control at the modem 202 should be in cases of lost packets, detected changes in environment, and/or other parameters that may affect to performance, before the local control abandons a lower performance state and starts to listen with full sensitivity.
  • PerformID may be an index number or PerformID may have additional parameters, e.g., how many missed packets may occur or by how much radio channel quality metrics may change before state change.
  • PerformID may include parameters related to transmission rate, transmission power, scheduler control, scanning/handover control, and/or receiver dynamic range.
  • the host 200 may set the PerformID, which defines transmission power and/or receiver parameter ranges which should be used in run-time control of the modem 202. Accordingly, the PerformID allows application usage, and environment dependent running of the modem 202.
  • the PerformID set by the host 200 may indicate an amount of packet retransmissions required before a state change, a WLAN mode (e.g., infrastructure, ad-hoc) and/or the connectivity of the device (e.g., active data sources in different access categories (AC). Any other or further indications might be used.
  • the modem 202 may have a control entity, e.g., in the one or more modules of the modem 202, separate from the host 200 and the control logic of the host 200 which configures transmitter 212 and/or receiver 214 parameters according to different PerformIDs.
  • the modem 202 may determine the signal and noise strength (e.g., RSSI) and/or packet error ratio (e.g., errors in received packets), etc. for received packets, (e.g., on a packet-by-packet basis).
  • the modem 202 may detect parameters, (e.g., movement, external radio transmissions (e.g., Bluetooth or some other radio), etc.), and/or control real-time operations of transmission power, transmission rate, receiver sensitivity, etc.
  • the host 200 may set any number of various PerformIDs.
  • the PerformIDs may have parameters including traffic load (e.g., type and amount allowed), transmission/receive mode optimization curve (e.g., for power, throughput, errors) and/or movement of the device, etc.
  • the device 200 may be in communication using a safe mode PerformID.
  • the safe mode may maximize link margin at a first phase.
  • Channel and application analysis may begin, and after connection is established the host 200 may set a usage specific PerformID for the modem 202 to continue operation in a throughput or power optimized manner. Throughput optimization may target maximum capacity and reduce delays during connection. If there are enough link margins, lower transmission power may be used; however, the modem 202 may generally use maximum transmission power and a highest supported rate.
  • the host 200 may set a PerformID to improve power operation at modem 202.
  • the modem 202 e.g., the transmission module, may use a lower transmission rate and/or power depending on channel statistics.
  • the modem 202 may operate in the safe mode, (e.g., after notification to the host 200), if errors are detected or the link margin drops below a desired, or alternatively, a predetermined level. Accordingly, the host 200 may set a safe mode and/or one or more various other PerformIDs to control the state of the modem 202.
  • Fig. 7 shows example state diagram for setting parameters of receiver control of the modem.
  • the host 200 may alter receiver performance policy RxPerformPolicy of receiver by setting a RxPerformPolicy command with an index parameter, e.g., in the PerformID.
  • the index parameter may describe a set.of parameters that are used for performance management in receiver control. If the receiver 214 receives a RxPerformPolicy command, the receiver 214 determines if the index parameter differs from the parameter set for the safe mode (or normal operation mode or any other mode), e.g., 1 in Fig. 7.
  • the receiver 214 may change run-time operation parameters based on the altered RxPerformPolicy. For example, as illustrated in Fig.
  • a receive policy limit RxPolicyLimit for link quality may be set to a minimum signal-to-noise ratio (SNR) rate plus a desired, or alternatively, a predetermined margin, and a receive policy limit RxPolicyLimit for packet errors may be set in accordance with a value corresponding to the altered receive performance policy RxPerformPolicy.
  • Fig. 7 illustrates examples embodiments having a PerformID including an index number; however, example embodiments are not limited thereto and the PerformID may include other or additional parameters.
  • Fig. 8 shows example state diagram for setting parameters of transmitter control of the modem.
  • the host 200 may alter transmission performance policy TxPerformPolicy of the transmitter 212 by setting a TxPerformPolicy command with an index parameter, e.g., in the PerformID. If the transmitter 212 receives a TxPerformPolicy command, the transmitter 212 determines if the index parameter differs from the safe mode (or normal operation mode), e.g., 1 in Fig. 8. The transmitter 212 may change run-time operation parameters based on the altered TxPerformPolicy. For example, as illustrated in Fig.
  • a transmit policy limit TxPolicyLimit for link quality may be set to a minimum signal- to-noise ratio (SNR) rate plus a desired, or alternatively, a predetermined margin, and/or a transmit policy limit TxPolicyLimit for missed acknowledgements (ACKs) may be set in accordance with a value corresponding to the altered receive power policy TxPerformPolicy.
  • Fig. 8 illustrates examples embodiments having a PerformID including an index number; however, example embodiments are not limited thereto and the PerformID may include other or additional parameters. [0038] Example embodiments are disclosed to save power in a WLAN transmitter by adjusting transmission power.
  • Example embodiments are based on a performance profile / policy based approach (PerformlD), which may be a performance abstraction layer.
  • PerformlD a performance profile / policy based approach
  • the power levels are adjusted, depending on the current performance profile and the related parameters, e.g. a transmit-policy signal-to-noise ratio limit and/or a transmit-policy error limit stored in a transmit policy partition 218 of the at least one policy register 215.
  • the performance profile / policy based approach defines the allowable packet error rate and an allowable signal-to-noise (SNR) value.
  • SNR signal-to-noise
  • the performance profile is controlled by the host 200 and the execution of the performance mechanism is performed autonomously in the modem 202 based on the allowable packet error rate and the allowable SNR value defined by the PerformlD.
  • Example embodiments are disclosed to reduce performance in a WLAN receiver by adjusting the sensitivity in the receiver, for example, the analog to digital converter (ADC) portion of the receiver.
  • An example embodiment may reduce bit- width of the ADC.
  • the bit- width reduction method may be based on the performance profile / policy based approach (PerformlD).
  • Example embodiments may include analog and/or digital modules or elements for processing of the received signal. If the PerformlD is used, different settings / reconfigurations are performed depending on the current profile and the related parameters stored in a receive policy partition 216 of the policy register 215.
  • the parameters may define the allowable packet error rate and/or allowable SNR value or other receiver parameters.
  • the performance profile PerformlD is controlled by the host 200 and the execution of the performance adaption mechanism is performed autonomously in the modem 202.
  • Example embodiments may also employ movement tracking to create more accurate channel estimations. If movement of the device IOOA is detected, a less aggressive scheme may be used at the modem 202 depending on the PerformlD. If no movement is detected, the modem 202 's control logic may assume that channel estimation is valid for a longer period of time, (e.g., a RX and TX Policy Timeout parameter may be extended in response to information received at the modem 202 from the host 200 via the interrupt signal).
  • a RX and TX Policy Timeout parameter may be extended in response to information received at the modem 202 from the host 200 via the interrupt signal.
  • Fig. 3 shows example real-time operation state diagram of the modem 202 control of the receiver 214 in response to a receive policy stored in the receive policy partition 216.
  • presented parameters are receive policy signal- to-noise ratio limit (RxPolicySNRLimit) and receive policy error limit (RxPolicyErrorLimit).
  • the presented parameters are described by the PerformID and stored in the receive policy partition 216 of the at least one policy register 215. Alternately, the parameters may be modified using a separate overrun parameter.
  • Channel quality and/or missed packets metrics are one example of parameters which modem 202 may utilize if modem 202 is determining an improved way to utilize a selected energy saving method.
  • the PerformID command indicates how the local control in the modem 202 may be adapted to the different usage.
  • the PerformID scheme may be modified according to modem 202 implementation.
  • Example estimated average energy saving for an example embodiment as compared to a conventional implementation may be substantial for both receiver functions and transmission functions if WLAN standard doze state based power saving is utilized for the conventional implementation. However, if the doze state is not used for the conventional implementation, estimated gains of an example embodiment as compared to the conventional implementation are much larger.
  • the example state diagram of receiver control of Fig. 3 includes state 302, which is a safe mode with normal performance of the receiver 214.
  • the safe mode may allow for any type of data/traffic load, any movement of the device 10OA, and/or a maximum link margin (e.g., maximum RX sensitivity).
  • the safe mode is not limited thereto and may include any number of desired parameters and parameter values.
  • a decision 304 is made by the modem 202 to determine whether the link quality is greater than the receive policy limit RxPolicyLimit in partition 216 of policy register 215. If decision 304 is NO, the state remains in state 302. If decision 304 is YES, the state changes from state 302 to state 306 for an adjusted, e.g., reduced, performance of the receiver 214. An amount of RX performance adjustment in state 306 may be proportional to a difference between measured link quality and receive policy limit RxPolicyLimit depending on an implementation of receiver 214.
  • SNR signal-to-noise
  • a decision 308 is made by the modem 202 to determine whether the detected number of packet errors N_packet_errors is less than the receive policy limit RxPolicyLimit in partition 216 of policy register 215. If decision 308 is YES, the state remains in state 306 and the link quality is periodically rechecked at 304 to decide if the state should return to state 302. If decision 308 is NO, the state changes from state 306 to state 302 for the safe mode with normal performance of the receiver 214.
  • a state transition from state 306 to 302, e.g., to safe mode may occur if a time period from a last link quality measurement is violated, (e.g., a received packet exceeds RxPolicyTimeout parameter value set by host 200).
  • the adjusted RX performance mode may be used for connection maintenance like beacon reception in a WLAN infrastructure, ad-hoc and/or mesh networks.
  • Example embodiments are described with regard to a single adjusted performance state / mode of the receiver 214, example embodiments are not limited thereto.
  • Example embodiments may include a plurality of adjusted performance states / modes having different performance aspects, (e.g., parameters), for the receiver 214.
  • example embodiments may include a plurality of modes having receiver performance levels different than a safe mode with normal performance of the receiver 214. Accordingly, example embodiments may switch between the plurality of adjusted performance states / modes to increase or decrease receiver performance, (e.g., receiver sensitivity), without needing to return to the safe mode.
  • receiver performance reduction methods may include a less bits approach, less performance approach, a reduction in noise figure of RF front end approach, and/or an approach putting main ADC's into a sleep state.
  • example embodiments are not limited thereto, and various methods of reducing receiver performance and/or sensitivity may be implemented by example embodiments.
  • ADC operation in the receiver 214 may use fewer bits, e.g., 6 bits instead of 8 bits.
  • the modem 202 may set reconf ⁇ gurable ADCs in a lower performance mode. For example, in a case of a sigma-delta ADC, an iteration loop is run by a slower clock.
  • a switch may be used to drop part of a resistor tree out of operation with some modifications to used voltages.
  • example embodiments are not limited thereto, and a reduction in a number of bits for ADC operation in the receiver 214 may be implemented in various ways.
  • receiver performance may be reduced by a reduction in the noise figure of the RF front end of the receiver 214.
  • the modem 202 may use a reconfigurable design block to control channel adaptive front-end. Noise figure reduction may be performed by shutting off a low noise amplifier (LNA) of the receiver chain of the receiver 214.
  • LNA low noise amplifier
  • RF front-end circuitry of the receiver 214 may include separate operating points which may be selected using switches such that performance parameters, (e.g., gain, noise figure, linearity or the like), may be lowered.
  • Active RF components may be adjusted by controlling the bias current which determines an operating point, e.g., an applicable input power region (dynamic range) and sensitivity of the receiver 214.
  • analog baseband circuits in the receiver 214 may be modified to trade-off dynamic range for power.
  • a reduction in the noise figure of the RF front end of the receiver 214 may be implemented in various other ways.
  • receiver performance may be reduced by putting main ADC's into a sleep state.
  • received signal strength indication (RSSI) measurement may be implemented in an analog front end of the receiver 214.
  • ADCs of a mixed signal receiver RX chain in the receiver 214 may be kept in a sleep state until a received frame start is detected.
  • a reduced performance mode may be implemented solely in a digital domain of a transmitter and/or receiver chain, or in both the analog and digital domains.
  • the reduced performance mode may be implemented by reducing the bit width of functional modules used in the transmitter and/or receiver chains or by using special lower performance modules in the transmitter 212 and/or receiver 214.
  • signal-to-noise ratio may be estimated before receiving a frame, and frames having higher error probability, (e.g., error probably above a threshold level), may be discarded.
  • error probability e.g., error probably above a threshold level
  • Each of the digital blocks in the receiver 214 may operate symbol by symbol, and if errors are detected in any phase, the following blocks are not turned on and the remainder of the packet is discarded.
  • ADCs may be put into a sleep state in the digital domain through asynchronous logic. Any of the presented examples for receiver performance adjustments may be used alone or may be combined with any other of the above presented adjustments methods.
  • the WLAN channel access scheme requires that all stations in the network detect each other. If transmission power is reduced, there is a likelihood of a hidden terminal that will cause collisions. More effective utilization of transmission power adjustment requires more efficient channel estimation.
  • the WLAN standard may not support two-directional link margin measurements or link state knowledge exchange. Therefore, additional information may be needed if transmission power adjustment-based performance features are to be utilized in a WLAN chipset.
  • a station may make a reasonable assumption that there are no additional stations operating and, thus, the station's transmission power may be changed according to an estimated path loss.
  • a host in the station may have delayed information concerning the path loss.
  • a modem may not utilize transmission power-based energy save efficiently because the modem does not have a usage or service requirement-based information as to when to use transmission power adjustments.
  • Example embodiments may reduce power consumption of the WLAN equipped terminal by utilizing a modular system architecture.
  • the modem 202 e.g., the one or more modules in the modem 202, may have real-time channel monitoring information that may be combined to control transmission power.
  • the modem 202 may have internal control logic that adjusts the transmission power according to a detected path loss and/or link quality.
  • the host 200 may set different policies as to how the modem 202 should use transmission power control to reduce energy consumption via the interface 208 and commands.
  • the interface 208 and a division of the functions performed by the host 200 and the modem 202 are aspects of example embodiments.
  • Fig. 4 shows example state diagram of the transmitter control.
  • transmit policy signal-to-noise ratio limit (TxPolicySNRLimit) and transmit policy error limit (TxPolicyErrorLimit) are stored in the transmit policy partition 218 of the PerformID policy register 215.
  • the parameters may be modified using separate overrun parameters.
  • Channel quality and number of missed ACKs are one example of parameters, which modem 202 may utilize if modem 202 is determining an improved way to utilize selected energy saving methods.
  • the PerformID command to the modem 202 indicates to the modem 202 how the local control in the modem 202 may be adapted to the different usage situations, instead of setting a full range of different parameters using different commands.
  • PerformID scheme may be modified according to modem 202 implementation. For example, if there is a transmission buffer of several packets or some packet aggregation scheme is used, the host 200 may sleep to save power; however, the modem 202 may still independently adjust link SNR of each packet if the host 200 sleeps. There may also be a separate fast signal (interrupt) between host 200 and modem 202 which, in case of a sudden change in operating environment, is used to reset performance adjustment features of the modem 202, for example, the modem 202 goes to "safe mode" as in Fig. 4.
  • interrupt separate fast signal
  • the example state diagram of Fig. 4 includes state 402, which is the safe mode with normal performance of the transmitter 212. If a signal-to-noise (SNR) change is detected by the modem 202, a decision 404 is made by the modem 202 whether the link quality is greater than the transmit policy limit TxPolicyLimit in partition 218 of policy register 215. If decision 404 is NO, the state remains in state 402. If decision 404 is YES, the state changes from state 402 to state 406 for adjusting, (e.g., dropping), the transmit power of transmitter 212. The size of the adjustment may be proportional to a difference between link quality metrics and TxPolicyLimit.
  • SNR signal-to-noise
  • a decision 408 is made by the modem 202 whether the detected number of missed ACKs (N_missed_ACKs) is less than the transmit policy limit TxPolicyLimit in partition 218 of policy register 215. If decision 408 is YES, the state remains in state 406, but TX power may be increased by one step and the link quality is periodically rechecked at 404 to decide if the state should return to state 402. If decision 408 is NO, the state changes from state 406 to state 402 for the safe mode with normal performance of the transmitter 212. State transition from state 406 to 402 safe mode may happen when a time limit expires from last link quality measurement for example received packet exceeds TxPolicyLimit parameter value.
  • Example embodiments are described with regard to a single adjusted performance state / mode of the transmitter 212, example embodiments are not limited thereto.
  • Example embodiments may include a plurality of adjusted performance states / modes having different performance aspects, (e.g., parameters), for the transmitter 212.
  • example embodiments may include a plurality of modes having transmitter performance levels different than a safe mode with normal performance of the transmitter 212. Accordingly, example embodiments may switch between the plurality of adjusted performance states / modes to increase or decrease transmitter performance, (e.g., transmission power), without needing to return to the safe mode.
  • the one more transmitter modules in the modem are examples of the transmitter 212.
  • Transmission power may be scaled according to channel attenuation, and may be adjusted step by step using an amplifier with variable gain and compression point. Adjustments may be performed at run-time with digital control, and digital back-off may be changed according to changed amplifier properties.
  • an adjustable amplification chain of a transmission chain in transmitter 212 may include a variable gain amplifier (VGA), current buffer, power amplifier driver, and/or external power amplifier. Each amplifier may be digitally adjustable. The amplifiers may be adjusted through tunable degeneration resistance to impact gain and linearity, tunable load resistance to impact amplification gain, tunable bias current or voltage to affect direct current (DC) power consumption and overall performance, and/or tunable supply voltage to impact the DC power and performance.
  • VGA variable gain amplifier
  • the amplifiers may be adjusted through tunable degeneration resistance to impact gain and linearity, tunable load resistance to impact amplification gain, tunable bias current or voltage to affect direct current (DC) power consumption and overall performance, and/or tunable supply voltage to impact the DC power and performance.
  • DC direct current
  • example embodiments are not limited thereto, and transmission power may be adjusted in various other ways.
  • example embodiments may be implemented as a machine, process, or article of manufacture by using standard programming and/or engineering techniques to produce programming software, firmware, hardware or any combination thereof.
  • Any resulting program(s), having computer-readable program code, may be embodied on one or more computer-usable media such as resident memory devices, smart cards or other removable memory devices, or transmitting devices, thereby making a computer program product or article of manufacture according to the embodiments.
  • the terms "article of manufacture” and “computer program product” as used herein are intended to encompass a computer program that exists permanently or temporarily on any computer-usable medium or in any transmitting medium which transmits such a program.
  • memory/storage devices include, but are not limited to, disks, optical disks, removable memory devices such as smart cards, SIMs, WIMs, semiconductor memories such as RAM, ROM, PROMS, etc.
  • Transmitting mediums include, but are not limited to, transmissions via wireless communication networks, internet, intranets, telephone/modem-based network communication, hard-wired/cabled communication network, satellite communication, and other stationary or mobile network systems/communication links.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Des modes de réalisation donnés à titre d'exemple de la présente invention concernent un procédé, un appareil et un produit-programme informatique permettant des modes de fonctionnement à performances réduites entre des dispositifs sans fil. Des modes de réalisation donnés à titre d'exemple réduisent les performances dans des dispositifs sans fil en réglant les niveaux de sensibilité d'un récepteur sans fil dans un module du dispositif en réponse à un profil de performance et/ou en réglant la puissance d'émission d'un émetteur sans fil dans le module du dispositif en réponse au profil de performance.
PCT/IB2008/002580 2008-10-01 2008-10-01 Communication sans fil au moyen d'une politique de performance WO2010038094A1 (fr)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101917345A (zh) * 2010-09-01 2010-12-15 杭州华三通信技术有限公司 无线局域网中的流量控制方法及设备
US9113427B2 (en) 2012-12-07 2015-08-18 Qualcomm Incorporated Systems, apparatus, and methods for mitigating transmitter induced desense
EP2833692A4 (fr) * 2012-04-23 2015-09-30 Huawei Tech Co Ltd Procédé, station de base et système de transmission de données

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Publication number Priority date Publication date Assignee Title
US20040041538A1 (en) * 2002-08-27 2004-03-04 Vladimir Sklovsky Power resource management in a portable communication device
EP1473885A1 (fr) * 2003-04-30 2004-11-03 Motorola, Inc. Unité de communication sans fil et procédé d'économie d'énergie avec une fonction d'adaptation de liaison tenant compte des aspects énergétiques
US20050048960A1 (en) * 2003-09-03 2005-03-03 Sharp Kabushiki Kaisha Information processing device, control device, communication device, communication equipment, electronic device, information processing system, power management method, power management program, and recording medium
US20060019723A1 (en) * 2004-06-29 2006-01-26 Pieter Vorenkamp Automatic control of power save operation in a portable communication device utilizing historical usage information

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Publication number Priority date Publication date Assignee Title
US20040041538A1 (en) * 2002-08-27 2004-03-04 Vladimir Sklovsky Power resource management in a portable communication device
EP1473885A1 (fr) * 2003-04-30 2004-11-03 Motorola, Inc. Unité de communication sans fil et procédé d'économie d'énergie avec une fonction d'adaptation de liaison tenant compte des aspects énergétiques
US20050048960A1 (en) * 2003-09-03 2005-03-03 Sharp Kabushiki Kaisha Information processing device, control device, communication device, communication equipment, electronic device, information processing system, power management method, power management program, and recording medium
US20060019723A1 (en) * 2004-06-29 2006-01-26 Pieter Vorenkamp Automatic control of power save operation in a portable communication device utilizing historical usage information

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101917345A (zh) * 2010-09-01 2010-12-15 杭州华三通信技术有限公司 无线局域网中的流量控制方法及设备
EP2833692A4 (fr) * 2012-04-23 2015-09-30 Huawei Tech Co Ltd Procédé, station de base et système de transmission de données
US9113427B2 (en) 2012-12-07 2015-08-18 Qualcomm Incorporated Systems, apparatus, and methods for mitigating transmitter induced desense

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