WO2009037624A2 - Agencement d'interface sans fil à connexion multiple et démarche associée - Google Patents

Agencement d'interface sans fil à connexion multiple et démarche associée Download PDF

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Publication number
WO2009037624A2
WO2009037624A2 PCT/IB2008/053715 IB2008053715W WO2009037624A2 WO 2009037624 A2 WO2009037624 A2 WO 2009037624A2 IB 2008053715 W IB2008053715 W IB 2008053715W WO 2009037624 A2 WO2009037624 A2 WO 2009037624A2
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WO
WIPO (PCT)
Prior art keywords
wireless
network
wireless device
networks
wireless network
Prior art date
Application number
PCT/IB2008/053715
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English (en)
Other versions
WO2009037624A3 (fr
Inventor
Parag Garg
Olaf Hirsch
Steve Shearer
Original Assignee
Nxp B.V.
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 Nxp B.V. filed Critical Nxp B.V.
Priority to CN200880107273A priority Critical patent/CN101803449A/zh
Publication of WO2009037624A2 publication Critical patent/WO2009037624A2/fr
Publication of WO2009037624A3 publication Critical patent/WO2009037624A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/25—Maintenance of established connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
    • 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

  • the present invention relates generally to communications and, more particularly, to communication methods and arrangements involving wireless interfaces for connection to multiple networks.
  • One type of electronic communications system involves those communications associated with wireless communications between two devices.
  • An example of a wireless approach involves the use of IEEE 802.11 wireless protocols to transmit Ethernet packets between wireless devices.
  • a system that includes connections between multiple wireless devices is often referred to as a network.
  • the wireless devices can include a central processing unit (CPU) that communicates with other devices using a wireless transceiver.
  • Software applications running on the CPU communicate with the wireless transceiver using a communications BUS or other link.
  • the interface between the applications and the wireless communications is often discussed in terms of protocol layers.
  • the low- level transmission level, such as analog transmission circuitry, is sometimes referred to as the physical layer (PHY).
  • PHY physical layer
  • the PHY includes, or is connected to, an antenna for receiving wireless signals.
  • Driver and receiver circuitry transmits and receives signals carried on the antenna.
  • a level above the PHY is sometimes referred to as the Machine Access Controller (MAC).
  • the MAC can implement a data-link layer between software applications and the PHY.
  • a MAC provides addressing and channel access control between multiple terminals or network nodes by providing channel and timing information to the PHY.
  • a MAC-PHY combination is active on only a single network at a time.
  • the device In some instances, it is desirable for the device to connect to multiple networks. Due to cost, complexity of design, physical size considerations and other factors, it can be disexcellentous to implement multiple instances of a PHY and/or baseband processing paths thereof. Moreover, disconnecting and reconnecting to wireless networks can increase the overhead involved in transactions and also result in the loss of data transmitted to the wireless device. These and other limitations present challenges to the implementation of wireless devices and methods for connecting to multiple wireless networks.
  • Various aspects of the present invention involve a method for use with a physical layer (PHY) in a wireless device.
  • PHY physical layer
  • One embodiment of the present invention provides a mechanism for connection and communication on multiple wireless networks by alternating the receiving and transmission functions of the PHY between the wireless networks.
  • the status of the connections on the networks is set to a reduced- activity mode to reduce the amount of time that the PHY must be communicating on each of the wireless networks.
  • Each network status/connection is tracked to allow for efficient transitions of the PHY between the networks. This allows for the PHY to switch between the networks regardless of their respective (frequency) channels.
  • a method is used for use in a wireless device having a wireless transceiver that is used to communicate on one channel at time and with first and second wireless networks having different channels, respectively.
  • the method uses the transceiver to communicate with and maintain active connection status on each of the wireless networks.
  • a reduced- activity mode indication is provided to the first wireless network.
  • a reduced- activity mode indication is provided to the second wireless network.
  • data transmissions from the first wireless network and the second wireless network to the wireless device are each responded to and an active connection status is maintained on both wireless networks simultaneously.
  • a method for maintaining active connection status on multiple wireless networks using a transceiver and includes establishing a connection between the wireless device and a first wireless network using the transceiver and a first instantiation of a channel control layer for providing channel state information to the transceiver. An indication of a reduced-activity mode is provided to the first wireless network. A connection between the wireless device and a second wireless network is established using the transceiver and a second instantiation of a channel control layer. An indication of a power-save mode is provided to the second wireless network. The first wireless network and the second wireless network are monitored for data transmissions to the wireless device.
  • a wireless device For each wireless network, a response to the data transmissions to the wireless device is generated thereby maintaining an active connection status on both wireless networks simultaneously.
  • a wireless device is implemented that communicates data between multiple wireless networks and a central processing unit (CPU).
  • the wireless device is used for simultaneously maintaining active connection status on the multiple wireless networks and includes a physical layer (PHY) circuit for receiving and transmitting wireless signals and a control arrangement for passing data between the PHY and the CPU and that is arranged to establish a connection between the wireless device and a first wireless network using the PHY and a first instantiation of a media access control layer (MAC); provide an indication of a power-save mode to the first wireless network; establish a connection between the wireless device and a second wireless network using the PHY and a second instantiation of a MAC; provide an indication of a power-save mode to the second wireless network; monitor the first wireless network and the second wireless network for data transmissions to the wireless device; and for each wireless network, respond to the data transmission to the wireless device thereby maintaining active connections to both wireless networks simultaneously.
  • PHY physical layer
  • MAC media access control layer
  • a wireless arrangement for maintaining active connection status on multiple wireless networks.
  • the wireless arrangement includes means for establishing a connection between the wireless device and a first wireless network using a PHY and a first instantiation of a media access control layer (MAC); means for providing an indication of a power-save mode to the first wireless network; means for establishing a connection between the wireless device and a second wireless network using the PHY and a second instantiation of a MAC; means for providing an indication of a power-save mode to the second wireless network; means for monitoring the first wireless network and the second wireless network for data transmissions to the wireless device; and means for responding to the data transmissions to the wireless device by alternatively using the wireless networks thereby maintaining an active connection status on both wireless networks simultaneously.
  • MAC media access control layer
  • FIG. 1 shows a wireless device/arrangement 100 for communicating with multiple wireless networks, according to an example embodiment of the present invention
  • FIG. 2 shows one example of communication protocols implemented between a wireless arrangement and two networks, according to an embodiment of the present invention
  • FIG. 3 shows a block diagram of an arrangement for maintaining simultaneously active connections to more than one wireless network, according to an example embodiment of the present invention
  • FIG. 4 shows a flowchart for implementing various aspects of the present invention. While the invention is amenable to various modifications and alternative forms, specifics thereof have been shown by way of example in the drawings and will be described in detail. It should be understood, however, that the intention is not to limit the invention to the particular embodiments described. On the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the scope of the invention as defined by the appended claims.
  • the present invention is believed to be applicable to a variety of circuits and approaches involving electronic communications, and in particular to those involving a MAC interface for connection to multiple networks through a single wireless receiver. While the present invention is not necessarily limited to such applications, an appreciation of various aspects of the invention is best gained through a discussion of examples in such an environment.
  • a wireless arrangement maintains active connections with two wireless networks simultaneously.
  • the wireless arrangement connects to each network and sends a reduced-activity (power-save) indication to the networks.
  • the wireless arrangement then periodically monitors the networks to determine if data is waiting to be transmitted to the wireless arrangement. This monitoring is performed for each network using the same receiver (PHY). Due to the reduced- activity indication, the wireless arrangement does not need to continuously monitor each of the networks to remain in an active status on that network. For instance, devices on the network that have data for transmitting to the wireless arrangement limit the transmission of the data (or the indication that there is data ready for transmission) to predetermined periods of time. During the time between the predetermined periods of time, the wireless arrangement can monitor the other network, or perform any other task, such as transmitting data to other devices using the wireless networks.
  • a method for use with a single physical layer (PHY) in a wireless device.
  • the method maintains active connections to multiple wireless networks using the single PHY.
  • the method comprises establishing a connection between the wireless device and a first wireless network using the PHY and a first instantiation of a media access control layer (MAC).
  • An indication of a power-save mode is provided to the first wireless network.
  • a connection is established between the wireless device and a second wireless network using the PHY and a second instantiation of a MAC.
  • An indication of a power-save mode is then provided to the second wireless network.
  • Monitoring for data transmissions to the wireless device is performed for both the first wireless network and the second wireless network.
  • the wireless device responds to the data transmission to the wireless device thereby maintaining an active connection status to both networks simultaneously.
  • FIG. 1 shows a wireless device/arrangement 100.
  • Device 100 includes a PHY 106, channel control layers (e.g., MACs) 102-104 and networks 108-110.
  • the PHY 106 includes signal components for receiving and transmitting wireless (e.g., radio frequency) data. These components can perform various functions, such as filters, amplifiers, conversion of digital data into a wireless signal and conversion of a wireless signal into digital data.
  • MAC-I (102) provides control for interfacing with network-1 (108), while MAC-N (104) provides control for interfacing with network-N (110).
  • Arrangement 100 connects to one of the networks 108 using PHY 106.
  • One of the MACs 102 is instantiated to control access to this connected network.
  • Normal operation between the arrangement 100 and the connected network 108 involves communication accomplished during a set of active time periods.
  • the arrangement is expected to monitor the network channel of the connected network 108 during the set of active time periods.
  • the arrangement 100 sends a reduced- activity (power-save) indication to the connected network 108.
  • This indication alerts the connected network 108 that the arrangement 100 is only expected to respond during a subset of active time periods.
  • the arrangement 100 can then connect to another network 110 during time periods between the subset of active time periods.
  • Another MAC 104 is instantiated to control access to this second network 110.
  • the arrangement 100 sends another reduced- activity (power- save) indication to the connected network 110. Thereafter, the arrangement 100 sends and receives data to the desired network using the corresponding MAC to control the PHY.
  • a software application can access either network by identifying the desired network. This can be particularly useful for allowing relatively simple access to either of the networks.
  • the identification of the network can be accomplished by a number of mechanisms including but not limited to, matching (IP) addresses to the appropriate network, specifying a connection/network as the destination or a software driver that determines the appropriate network.
  • IP matching
  • each access can be sent on more than one (or each) active network. This is particularly useful for applications in which the identifying (IP) addresses are exclusive between networks or for broadcast communications.
  • each instantiation of a MAC is set up with a unique MAC identification (ID).
  • ID MAC identification
  • the wireless arrangement 100 appears as two distinct wireless nodes, each with a distinct MAC ID. This can be particularly useful for avoiding data routing problems should any of the networks be connected. For instance, if network- 1 and network-N were connected to the same WAN or LAN, then a packet sent on the connected WAN or LAN could encounter a routing problem, such as a routing loop, due to different MACs having the same MAC ID.
  • the maximum number of networks possible could be a predetermined number (e.g. , corresponding to the number of valid MAC IDs available) or it could be a number that is determined by other factors, such as the bandwidth required to maintain connections to each of the networks. This bandwidth can vary depending upon the network settings, such as the periodicity of the subset of active time periods for each of the networks.
  • portions of the arrangement 100 and/or the wireless networks correspond to various ISO/IEC standards for wireless communications, including but not limited to, various ISO/IEEE 802.11 specifications and Wireless LAN Media Access Control (MAC) and Physical Layer (PHY) specifications (e.g. , ISO/IEC 8802-11).
  • each of network- 1 to network-N can be implemented as either a basic-service-set (BSS) or an independent-basic-service-set (IBSS) network.
  • BSS basic-service-set
  • IBSS independent-basic-service-set
  • a specific example of the active time periods includes Target Beacon Transmit Time (TBTT), as set forth in the IEEE 802.11 specification.
  • FIG. 2 shows one example of communication protocols implemented between a wireless arrangement and two networks, according to an embodiment of the present invention.
  • Virtual station 202 represents a wireless arrangement for maintaining active connection status with networks 204 and 206.
  • an active connection status does not require that the wireless arrangement be continuously active (i.e., receiving or transmitting) on the networks. Instead, the wireless arrangement functions within the parameters of the connected networks. The wireless arrangement maintains this functionality so as to keep the respective network controllers/providers from determining that the wireless arrangement is non-responsive or otherwise problematic. In many wireless networks, such non- responsive or problematic clients can be dropped from the network (e.g., no longer serviced by the network).
  • Virtual station 202 is considered "virtual" because it can represent more than one network connection using the same PHY.
  • Network 204 is shown as a BSS network operating on channel 1 and network 206 is shown as an IBSS network operating on channel 6.
  • This is but one possible combination of networks and channels, and the invention is not necessarily limited.
  • the networks could each be IBSS or BSS and any acceptable channel could be implemented for each network.
  • various implementations of the present invention could function with two or more of the networks operating on the same channel.
  • the virtual station 202 establishes a connection with network 204.
  • virtual station 202 sends a reduced-activity indication to the network 204.
  • the particular indication shown in FIG. 2 is a power-save indication. This indicates, to network 204, that data destined for virtual station 202 should be buffered for transmission only during predetermined times. This feature exists in various network protocols, such as IEEE 802.11, to allow a device to reduce power by only activating the PHY/transceiver during the predetermined times.
  • the virtual station 202 can then establish a connection to network 206 at time 212. To avoid missing data transmissions on network 204, this connection can be established between the predetermined transmission times of network 204.
  • virtual station 202 sends a reduced-activity indication to the network 206.
  • the virtual station 202 monitors the active network connections during time periods (windows) corresponding to when beacons are transmitted.
  • the beacons indicate whether there is buffered data for virtual station 202 (e.g. , using a traffic indication map/message (TIM) or an ad hoc traffic indication map/message (ATIM)). If the beacon indicates that data is buffered for virtual station 202, the virtual station can respond to the beacon (e.g., using a power-save-(PS)-poll handshake). The network 204 then sends the buffered data to virtual station 202 at time 218.
  • TIM traffic indication map/message
  • ATIM ad hoc traffic indication map/message
  • a similar procedure for indicating buffered data is ready for transmission can be followed with respect to network 206, as shown by beacon and acknowledgement at time 220 and by the corresponding data reception shown at time 222.
  • the specific sequence of events can be accomplished in a number of different combinations.
  • the connection to the second (and subsequent) networks need not occur immediately following the connection to the first network.
  • the virtual station need not send the reduced activity indication until there is a request to connect to a second network. This can be particularly useful for a virtual station that maintains a connection to a first network, such as an ISP, and that occasionally connects to a second network, such as a personal PDA.
  • FIG. 3 shows a block diagram of an arrangement for maintaining simultaneously active connections to more than one wireless network, according to an example embodiment of the present invention.
  • Arrangement 300 includes a PHY 302 and a MAC portion 301.
  • the MAC portion 301 includes two instantiations of a MAC (304 and 318).
  • the combination of the MAC portion 301 and PHY 302 allow for data to be communicated between CPU 322 and one or more wireless networks.
  • the basic functionality of each MAC includes, but is not limited to, the establishment of a connection to a respective network (306, 314), the indication of a reduced- activity (power-save) state (310, 316) and communication on the respective network (308, 312).
  • the communication (308, 312) can include transmitting data and or monitoring during active transmission periods associated with the reduced activity state for the respective network.
  • the active transmission periods correspond to beacons.
  • the arbitration 320 selects the appropriate MAC portion during the beacon period.
  • the arrangement 300 handles the beacon (e.g., performs a handshake with the network) in response to the beacon indicating that there is buffered data to be transmitted to the arrangement 300.
  • the indication from the beacon can take the form of a TIM or ATIM frame.
  • Arbitration 320 can also be used to select the MAC that is used to send out going data via PHY 302.
  • the correct MAC is indicated by the application sending the data.
  • the correct MAC is selected by analyzing the target address of the data to determine the appropriate network. This can be accomplished using a routing table or similar methods.
  • FIG. 4 shows a flowchart for implementing various aspects of the present invention.
  • a connection is established with the first network.
  • Establishing a connection can include, but is not limited to, identification of the network, authentication with the network and association with the network.
  • identification of the network can be accomplished through predetermined knowledge of the network (i.e. , passive).
  • identification of the network can be accomplished by scanning for available networks (i. e. , active) and selecting between those found.
  • Some networks require authentication, such as wired-equivalency-privacy (WEP) or Wi-Fi protected access (WPA). Once the device has been authenticated, it can then be associated with the network.
  • WEP wired-equivalency-privacy
  • WPA Wi-Fi protected access
  • the association can include providing the MAC ID to the network and receiving and Internet Protocol (IP) address.
  • IP Internet Protocol
  • the wireless device indicates, to the first network, that it is functioning in a limited availability (power save) mode.
  • the network does not require/expect the wireless device to maintain constant monitoring of the network traffic. This allows the wireless device to use the PHY for other purposes during times at which the network does not require active monitoring.
  • the wireless device can connect to a second network, as shown at step 406.
  • the wireless device indicates, to the second network, that it is functioning in a limited availability (power save) mode.
  • the wireless device can repeat steps 406 and 408 for additional networks as desired.
  • the wireless device switches between monitoring of beacons transmitted by each of the active networks. If one of the beacons indicates that there is buffered data for transmission to the wireless device, the wireless device handles the transmission by requesting the data from the respective network and receiving the data thereafter, as shown by steps 412 and 414. The wireless device can then return to the beacon monitoring shown at step 410.
  • one or more of the networks is a BSS network.
  • the periodicity of the beacon monitoring can be determined by the rate at which TIM frames are transmitted.
  • This data beacon rate is sometimes referred to as the delivery traffic indication message (DTIM) interval/rate. If the DTIM interval is not set to a 1, then the TIM frames are only transmitted at multiples of the DTIM interval. For example, if the DTIM interval is 3, then a TIM frame is only transmitted every third beacon.
  • the MAC(s) can also implement a high-layer (e.g., address-resolution-protocol (ARP) or dynamic-host- configuration-protocol (DHCP)) awareness to help keep the device from being aged out in the network. This can help the wireless device to stay off the serving channel while still maintaining association with the network.
  • ARP address-resolution-protocol
  • DHCP dynamic-host- configuration-protocol
  • the wireless device can be configured to monitor/receive those frames every listen interval.
  • the wireless device can also elicit any stored data by intermittently sending the PS-Poll frames to the network.
  • one or more of the networks is an IBSS network.
  • the wireless device presents itself as available for receiving (i. e. , by an ATIM-ACK exchange) its buffered packets during the ATIM-beacon window.
  • the monitoring can be done on a routine basis (in multiples of beacon interval).
  • the wireless device can set the beacon interval. Setting the beacon interval to a large value allows for more time for servicing other networks.
  • the various components of the invention can be implemented using a number of discrete circuits, processors configured with software, programmable logic and digital circuits.
  • the multiple instantiations of MACs can be implemented by creating multiple instances of a MAC state machine.
  • the state machine can be implemented using various arrangements including, but not limited to, programmable logic, software (firmware) running on a processor, discrete circuit components, digital logic and combinations thereof.
  • the interface between the MAC and the PHY can be implemented, for instance, using digital logic and discrete circuit components.
  • U.S. Patent No. 6,999,443 to Kuskin et al. and to U.S. Patent No. 5,909,564 to Alexander et al. each of which is fully incorporated herein by reference.
  • the PHY can be implemented using various components, including, but not limited to, programmable logic, software (firmware) running on a processor, discrete circuit components, digital logic and combinations thereof.
  • the PHY has only one baseband processing path, and only processes one (frequency) channel at any given time.

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

Abstract

Des dispositifs sans fil qui sont implémentés en faisant appel à un grand nombre d'agencements et de procédés. Un tel procédé inclut le maintien de l'état de connexion active sur de multiples réseaux sans fil en utilisant un PHY. Le procédé comprend l'établissement d'une connexion entre un dispositif sans fil et un premier réseau sans fil en utilisant le PHY et une première instanciation d'une couche de contrôle d'accès au support (MAC); la fourniture d'une indication d'un mode d'économie d'énergie au premier réseau sans fil; l'établissement d'une connexion entre le dispositif sans fil et un deuxième réseau sans fil en utilisant le PHY et une deuxième instanciation d'une couche MAC; la fourniture d'une indication d'un mode d'économie d'énergie au deuxième réseau sans fil; la surveillance du premier réseau sans fil et du deuxième réseau sans fil pour des transmissions de données au dispositif sans fil; et une réponse à la transmission de données au dispositif sans fil de façon à maintenir ainsi un état de connexion active sur les deux réseaux sans fil simultanément.
PCT/IB2008/053715 2007-09-17 2008-09-12 Agencement d'interface sans fil à connexion multiple et démarche associée WO2009037624A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN200880107273A CN101803449A (zh) 2007-09-17 2008-09-12 多连接无线接口

Applications Claiming Priority (2)

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US97316907P 2007-09-17 2007-09-17
US60/973,169 2007-09-17

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WO2009037624A3 WO2009037624A3 (fr) 2009-07-23

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CN102075346A (zh) * 2009-11-25 2011-05-25 株式会社日立制作所 网络系统的省电控制方法
US10938582B2 (en) 2016-08-02 2021-03-02 Samsung Electronics Co., Ltd. Electronic device and power control method of electronic device

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WO2012103718A1 (fr) * 2011-06-28 2012-08-09 华为技术有限公司 Procédé et dispositif de réseau pour économiser l'énergie d'un réseau
CN104581854B (zh) 2013-10-16 2019-07-12 中兴通讯股份有限公司 一种无线连接方法和装置

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US6999443B1 (en) 2000-09-15 2006-02-14 Atheros Communications, Inc. Hardware MAC

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Publication number Priority date Publication date Assignee Title
CN102075346A (zh) * 2009-11-25 2011-05-25 株式会社日立制作所 网络系统的省电控制方法
US10938582B2 (en) 2016-08-02 2021-03-02 Samsung Electronics Co., Ltd. Electronic device and power control method of electronic device
US11743060B2 (en) 2016-08-02 2023-08-29 Samsung Electronics Co., Ltd. Electronic device and power control method of electronic device

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WO2009037624A3 (fr) 2009-07-23

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