WO2013174672A1 - Procédé et système pour optimiser une liaison sans fil et l'utiliser pour transmettre de la puissance et réduire des interférences - Google Patents

Procédé et système pour optimiser une liaison sans fil et l'utiliser pour transmettre de la puissance et réduire des interférences Download PDF

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Publication number
WO2013174672A1
WO2013174672A1 PCT/EP2013/059837 EP2013059837W WO2013174672A1 WO 2013174672 A1 WO2013174672 A1 WO 2013174672A1 EP 2013059837 W EP2013059837 W EP 2013059837W WO 2013174672 A1 WO2013174672 A1 WO 2013174672A1
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Prior art keywords
wireless
wireless link
client devices
client
link
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PCT/EP2013/059837
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English (en)
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Primitivo MATAS SANZ
Carlos Gandarillas Diego
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Telefonica, S.A.
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Publication of WO2013174672A1 publication Critical patent/WO2013174672A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality

Definitions

  • the present invention generally relates, in a first aspect, to a method for a wireless link optimization, and more particularly to a method for distributing high rates of data effectively within said link.
  • a second aspect of the invention relates to a wireless link optimization deployment system for allowing the distribution of high rates of data and adapted for implementing the method of the first aspect.
  • a third aspect of the invention refers to a use of the method of the first aspect for transmission power and interference reduction.
  • Wireless links can introduce a bottleneck in the process of distributing High Data Rate services within the home; new access services based on fiber to the home (FTTH) connectivity provide average throughputs above 50Mbps on user's CPE, a speed which is difficult to maintain using wireless connectivity throughout the home.
  • the communication over a wireless channel is simply not able to achieve the same quality (throughput, error rate, etc.) as a wired channel, which reduces the quality of the multimedia services delivered.
  • Some of the factors that make wireless communications particularly problematic for transmitting real time services like VoIP or video-streaming, as well as High Data Rate (HDR) services are the continuous variable channel link conditions and the limited radio frequency spectrum which must be shared by in house clients.
  • the continuous change on the wireless channel conditions causes signal fading, throughput variations and loss of packets, in addition to this, wireless communication causes the multiple users attempting to access on the same channel at the same time to generate interference in the medium and degrade the link performance.
  • Wireless Link One of the most important issues that must be addressed regarding improvement on Wireless Link is how to avoid the harmful interference between network neighbor devices and also how adapt the radio emitter to environmental conditions at any time.
  • IEEE 802.1 1 WLAN uses a media access control protocol called Carrier Sense Multiple Access with Collision Avoidance (CSMA CA). While the name is similar to Ethernet Carrier Sense Multiple Access with Collision Detection (CSMA/CD), the operating concept is totally different.
  • WiFi systems are half duplex shared media configurations where all stations transmit and receive on the same radio channel. The main problem in a shared radio system is that a station cannot hear while it is sending, and hence it is impossible to detect a collision. Because of this, the developers of the 802.1 1 specifications developed a collision avoidance mechanism called the Distributed Control Function (DCF). According to DCF, a WiFi station will transmit only if it thinks the channel is clear.
  • DCF Distributed Control Function
  • HCF hybrid coordination function
  • WME WiFi Multimedia Extensions
  • WSM WiFi Scheduled Multimedia
  • WiFi Multimedia Extensions uses a protocol called Enhanced Multimedia Distributed Control Access (EDCA or EDFC), which is an enhanced version of the Distributed Control Function (DCF) defined in the original 802.1 1 MAC.
  • EDCA is based on QoS prioritization specified on IEEE 802.1 D; the enhanced part is that EDCA will define eight levels of access priority to the shared wireless channel.
  • the EDCA access is a contention-based protocol that employs a set of waiting intervals and back-off timers designed to avoid collisions.
  • DCF the same values and hence have the same priority for transmitting on the channel.
  • each of the different access priorities is assigned a different range of waiting intervals and back-off counters.
  • the standard also includes a packet- bursting mode that allows an AP or a mobile station to reserve the channel and send 3- to 5-packets in sequence.
  • DCF DCF
  • WiFi Scheduled Multimedia is an improvement for communicating real time transmission based services over IEEE 802.1 1. It uses a protocol called HCCA [4] (HCF coordinated channel access). WSM operates like the little used Point Control Function (PCF) defined with the original 802.1 1 MAC. In WSM, the AP periodically broadcasts a control message that forces all stations to treat the channel as busy and not attempt to transmit. During that period, the AP polls each station that is defined for time sensitive service. To use the HCCA option, devices must first send a traffic profile describing bandwidth, latency, and jitter requirements. If the AP does not have sufficient resources to meet the traffic profile, it will return a busy signal. As well as the PCF performances, this improved implementation has not been considered by any 802.1 1 ⁇ device manufacturers.
  • PCF Point Control Function
  • HCCA [5] is generally considered the most advanced and complex coordination function.
  • QoS can be configured with precision, QoS enabled stations can request specific transmission parameters (data rate, jitter%) which should allow advanced applications like VoIP or video-streaming to work more effectively on WLAN.
  • data rate data rate
  • jitter delay
  • the SNR is directly related to the throughput and the bit error rate (BER) on the wireless link. Consequently, the SNR is linked to the packet delay and jitter, and throughput, and has the potential to provide rich feedback for automatic rate control. Knowing the current SNR and the throughputs would solve the modulation rate selection problem instantly.
  • BER bit error rate
  • Patent US 2005/0060319 it is described a set of client parameters control on the Wireless AP in order to manage the roaming and communication change for associated Clients between different APs.
  • This patent is not focused on offering a reliable wireless channel link for the different Stations connected to the same AP.
  • the parameter managing is in order to achieve a reliable wireless roaming between different APs.
  • US2007/0238417 are related to channel change and its performance selection mechanisms, which sometimes include automatic transmitted power adjustments.
  • Smart Wi-Fi • Smart Wi-Fi. Under this name are collected four different solutions associated with Ruckus manufacturer devices, like BeamFlex (control resistant and adaptable of RF) Qos proprietary solution (SmartCast), security mechanisms (SmartSec) and RF routing mechanisms ("Smart-Mesh” networks).
  • BeamFlex control resistant and adaptable of RF
  • SmartCast Qos proprietary solution
  • SmartSec security mechanisms
  • Smart-Mesh RF routing mechanisms
  • SST Signal-Sustain Technology
  • LDPC Low Density Parity Check
  • MLD Maximum Likelihood Demodulation
  • beamforming transmit signals techniques
  • Maximal Ratio Combining to optimally combine the MIMO signal path.
  • VOW Qualcom-Atheros based
  • Channel state information a channel monitoring and optimization proprietary based techniques associated with Quantenna devices.
  • OptimizAIR based on the concept of "Spatial Channel Awareness” closed-loop transmission. This method is a Celeno manufacturer patent pending technology.
  • MAC Medium Access Control
  • HCCA Advanced method for assuring QoS
  • Wi-Fi Scheduled Multimedia which developed HCCA functionality, has not been considered by any 802.1 1 ⁇ device manufacturers.
  • EDCA DCF
  • the rate and SNR could be variable, this is because of the radio channel fluctuations and it is not easy to obtain or estimate a reliable value of the SNR on a wireless link.
  • 802.1 1 ⁇ On 802.1 1 ⁇ , many radio interfaces only provide a signal strength indication (SSI) without any reference value and for an optimum calculation of the rate controller, which is on the sending side, in fact the SNR observed at the receiving side is needed. For instance, a high SSI does not mean high SNR.
  • 802.1 1 ⁇ devices do not calculate the SNR on the client side from AP, and neither the transmitted data rate per wireless client, which makes it difficult to estimate the channel quality on real time communications.
  • the present invention relates, in a first aspect, to a method for a wireless link optimization, comprising an access point for establishing wireless communication with a plurality of wireless client devices, any of said wireless client devices connected to said access point through a dedicated wireless link.
  • the method of the first aspect comprises collecting information related to transmission features of any of said wireless client devices of operative communication status and adapting and prioritizing said dedicated wireless link, in order to perform said wireless link optimization, based on the performance of said transmission features collected from any of said wireless client devices.
  • the method performs said adapting and prioritizing dynamically in a real time continuous process by considering the continuous quality changes of said dedicated wireless link.
  • the method is preferably used for delivering real-time based services and/or high data rate services, such as a VoIP, a HD video, a video streaming or a combination thereof.
  • the transmission features are set at the start of the wireless link and are analyzed and compared with existing wireless link parameters.
  • the method is performed, automatically or manually, in order to ensure a high quality of service to any of the wireless client devices.
  • the performance of the wireless link optimization is based on the wireless client devices requirements, on a transmission performance and/or a physical medium.
  • the performance is done through a configuration interface running in a device with computing capacity.
  • the wireless link optimization can be performed in the access point and in the wireless client devices.
  • a second aspect of the present invention relates to a wireless link optimization deployment system, comprising:
  • the system of the second aspect performs an adaptation of said dedicated wireless link in order to perform said wireless link optimization based on information related to transmission features of any of said wireless client devices.
  • the system of the second aspect is adapted to implement the method of the first aspect.
  • a third aspect of the present invention relates to a use of the method of the first aspect for transmission power and interference reduction.
  • Figure 1 shows an example of the coordination protocol mechanism used in the present invention.
  • Figure 2 shows an example of the high level system diagram of the present invention.
  • FIG. 3 shows a control bridge functions GUI, according to an embodiment of the present invention.
  • Figure 4 shows an example of the link control updating process diagram.
  • Figure 5 shows an example of the 'Steering Bridge' control unit functionality.
  • Figure 6 shows a block specification diagram used in the present invention.
  • Figure 7 shows a video streaming delivery, according to an embodiment of the present invention.
  • Figure 8 shows an example of a dynamic link changing embodiment, according to an embodiment of the present invention.
  • FIG. 9 shows an example of several end customer services attached to the same WIFI client, according to an embodiment of the present invention.
  • Figure 10 shows an example of an internal wireless distribution embodiment, according to an embodiment of the present invention. Detailed Description of Several Embodiments
  • the present invention proposes a method being an adaptation of the transmission features and prioritization rules by means of a parameters list updated in real time, on a dynamic process over the IEEE 802.1 1 wireless link.
  • Wireless AP would identify their streams quality and requirements needed in order to apply the correct parameter for managing the wireless link. For this reason, it's important that the Wi-Fi infrastructure offer some alternative ways for identifying streams that carry especial services like HD Video streaming or VoIP.
  • the adaptation related to a special service deliver, depends on the client needs or requirements, on the transmission performance and on physical medium conditions.
  • the method consists on a request from the Clients to the AP in which are included the parameters needed for making the wireless link to work properly.
  • the AP takes those and other measured parameters and adapts the transmission features in order to provide the required QoS on the specific associated Client.
  • the network should know at any moment what kind of wireless link is being used and its prioritization parameters.
  • the main objective of applying this new method is to deliver reliable Data Transfer services over wireless links in a multi-room scenario.
  • the main goal can be achieved by providing the QoS needed on each wireless link and by optimizing the use of the radio spectrum and managing the data frames, prioritizing them, searching for the best radio channel or minimizing transmission power and interference.
  • the new defined method is located in the AP module that manages the interconnections of STAs (from now on the wireless associated clients on a BSSID), or in the bridge module if is work; the module that includes the features added by the invention is called 'Steering Bridge'.
  • the invention is based on the establishment of an owner link between an AP, that assume the role of Master in the wireless link communication, and the other associated wireless Client devices, from now on they are also called Stations (STAs), with a Slave role.
  • STAs Stations
  • a Client device is associated to an AP device, a communications socket link between the Master (AP) and the new Client is opened.
  • the mechanism defined on the invention for optimizing the wireless link is based on the interchange of messages between the master (AP) and slave (Client) WiFi devices.
  • the AP is the coordinator, the device in charge of managing the interchange of information between the AP and the STAs.
  • the AP has a managing function which collects the initial parameters and the individual parameters measured from Clients. After receiving the information from each one of its associated Clients, the AP adapts the different wireless links properties according to the received and the required parameters for each associated Client link. Those parameters are used in order to optimize the wireless link per Client.
  • the overall optimization process is focused on the wireless link per Client, generally based on each Client communication services requirements and their associated parameters.
  • the Client keeps the best parameters for initially working. If the parameters affected need to change because a new communication service is open, the STAs know how to change them.
  • the STAs also sends Prioritizations data values to the AP which it is associated. They send these initial data into the initial link packets, taking advantage of any free wireless data transmission time.
  • the Client periodically sends, under a Master request, a report of QoS status in the current channel.
  • a report of QoS status in the current channel Including a measurement of the radio medium conditions, parameters such as SNR, RSSI, received power, transmitted power, modulation scheme, packets retries, percentage of maximum channel occupancy or any other parameter related to the wireless link quality.
  • the Client performs a continuous scanning process in order to have an updated list of available RF channels conditions from the Client location point of view.
  • the results of the scanning are saved on table files.
  • the STAs will communicate the information about the wireless channels to the AP in order to make a smart channel switch.
  • the server parses the report received including the information parameters from Clients and performs the expected change in each one of the wireless links configuration parameters. For instance, between the actions that can be taken it can be included a switch to a new radio channel if it is needed because of the interference link status or an adjustment on the radio transmission power send to the Client.
  • the process performance include the analysis and comparison with existing wireless link parameters, the comparison with the threshold parameters values defined for guarantying a specific communication service over the wireless link, and per client packet analysis and radio channel features managing.
  • the wireless link establishment between the AP and STAs and the information management process in the AP requires the installation of specific dedicated modules in the AP and STAs.
  • the AP control module has the core algorithm of the described invention.
  • the Client module allows an effective and optimal parameters communication procedure in the wireless link.
  • the described modules can be on both, associated Clients and AP, in another embodiment the modules can be only on the AP, managing the related parameters by the provided GUI.
  • the AP according to the measurements of the wireless link state per STA, takes the decisions about the wireless link parameters configuration.
  • the method described on the invention could work in networks without the Client module installed.
  • the process performances include functionalities like analysis of the information and requirements received from STAs. If the invention module is not on the STAs the AP collects and manages the wireless link information.
  • the wireless link parameters communicated between the AP and STAs and vice versa are set at the start of the link. There is a process of prioritization and maximum bandwidth. Afterwards, some parameters can change dynamically according to the measurements of the wireless link QoS. These parameters are obtained on both, the AP and the STAs, if the STAs have being provided with the invention control module.
  • Wireless parameters values and information requires the interaction with the WiFi standards in order to obtain data and to manage the parameters o from the associated interface modules. All the associated operations are performed on the called 'Steering Bridge' module. There are two cases described:
  • Tupdate' A scheduled time called Tupdate' is defined. Every prefix time (TUPDATE) the
  • Client or Clients in case that there were more than one associated Station, send the updated information and afterwards the AP updates and adapts the wireless link according to the parameters received from each Client.
  • the method described on the invention defines an automatic mechanism on which the AP can set the wireless links options and parameters by default. It can be set also on manual configuration. In case of doing it manually it is done through a configuration interface described on the invention that is described below on Figure 3.
  • the manual performance mechanism is established in order to not reject STAs devices without the automatic described invention mechanism or STAs devices which have the described invention functionality disabled.
  • Each STA should send its own configuration with all the parameters, including the action that must be done on the wireless link optimization process.
  • the first line includes STA identification (clientjd), that could be its ip-addres o mac-address, and the following lines include different parameter related to the wireless link performance.
  • Latency 0 maxium latency
  • Bandwidth Include the maximum and minimum Bandwidth need to optimize the wireless link.
  • SNR Signal to Noise thresholds maximum and minimum to modify the associated AP parameter.
  • the parameters to change can be the transmitted Power, Packet Size, modulation codification and the frequency channel change when this threshold is exceeded.
  • RSSI Received Signal Strength Indication. Maximum and minimum to modify the associated AP parameter, in this case Signal Power and the channel change jump when this threshold is exceeded.
  • Channel jump Enables the possibility of making changes in frequency or channel when it exceeds the limits set.
  • Frame burst Enable the possibility of send several frames in burst mode according to the standard.
  • Priority Kernel process priority interface related. Maximum 1 , Minimum 5 Latency: Related to previous parameter.
  • Link-symmetry Indicates whether or not that link is going to be mainly in one direction AP->CL (downlink) or CL->AP (uplink). Valid value: Downlink, Uplink, Downlink/Uplink.
  • Favorite Channel Indicates best channel in the client's environment.
  • This parameter set can be easily adapted to include as much parameters as can be related to the wireless link performances. There are parameters that must be differentiated, such as prioritization, for different devices linked through the LAN interface to the associated WIFI STAs. The parameters will be something like that:
  • the format parameters are shown as an approximation description.
  • the communication mechanisms of these parameters must be adapted according to the chosen communication protocol and does not affect the method developed in the invention.
  • This module extends the concept of standard Media Access Control Bridge which allows the interconnection of Stations (Clients) as if they were attached to a single LAN, even if they are attached to separate LANs each of them having its own independent MAC.
  • every data-packet that passes through the AP to associated Client can be managed into the wireless link, configuring the different parameters associated to each one of Clients wireless links.
  • the procedure implementation requires the introduction of algorithm modules inside the stack architecture and packet managed unit in the AP core.
  • This module can be a part of the stack implemented in the WiFi devices core system.
  • Such implementation does not require any modification into the wireless chip-set devices currently available.
  • the Figure 2 shows a high level system block diagram.
  • the Commands Control It has the default parameters values defined for an associated AP-STAs link and the parameters values received from the associated Clients in case that the link would have been able to be established. It also allows different actions for configuring the parameters values through a web user interface environment.
  • the main block It is the master block. It is responsible for filtering packets sent by the associated STAs and for associating the appropriate parameters depending on the settings defined for each AP-Client Association requirements.
  • the Link Control Update In this block are performed functions related to the exchange of information from each one of the STAs to the AP. It opens the communication channel and initially asks for knowing the configuration and required link parameters of each associated client. It processes this initial values sent by the Clients and makes the request for new values of measures in each defined period in order to have a dynamic control of the wireless performance.
  • This Command control bridge sub-module is responsible for managing the configuration information of the actions on each one of the links related to the system and focused on each of the clients associated.
  • Figure 3 shows a possible configuration interface in a web-page example description. Describing a particular case of 3 Clients associated in order to show the different parameters and values managed in this block.
  • the initial group ('Create Sbridge') includes the definitions of standard configuration for a normal Bridge and it doesn't need more extended details.
  • the second group ('Assign Interface Group') includes particular references needed for the defined procedure. It defines the interface to which the described optimization procedure is going to be applied.
  • the 'Wifi Interface Control' group contains the main parameters values related to the procedure.
  • the first column appears the MAC of the associated client (Slaves Identification link)
  • the second column the data received in the last report submitted by the STAs when the procedure is supported by the associated wireless client device.
  • the third and fourth contains the proceedings or related functions which are changed in a particular associated customer's link, and finally, the last column presents the initial values of these parameters.
  • some data in this group can be defined manually by the WLAN customer. Those data are associated with the parameters obtained in the AP directly from the wireless link, which usually are related to each one of the STAs wireless link. For example, parameters like data-rate and number of retries per STA link.
  • This Link Control sub-module executes the coordination protocol between AP and associated Clients.
  • a scheduled time called 'Tupdate' is defined. Every prefix time (Tupdate) the AP requests to STAs an updating of their parameters measurements.
  • the Client or Clients in case that there were more than one associated Station, send the updated information and afterwards the AP updates and adapts the link parameters received from each Client. According to these new parameters values, actions on wireless link will be taken or not.
  • This block also collects information accessible from the AP on the different links to different clients, so when the Clients have no mechanism enabled, the control can be executed based on these defined QoS parameters.
  • the AP can set the wireless links options and parameters by default or by manually configuration. In case of doing it manually it is done through a configuration interface that is described below.
  • the manual mechanism is established in order to not reject STAs devices without the described invention automatic procedure or STA devices which have the described invention functionality disabled.
  • This module has several functions into the AP:
  • the figure 4 shows a schematics diagram of its functionality in both sides, one for the procedure into the Client unit and other for the link control module for the AP.
  • the main component of this method procedure is the Control Unit functionality.
  • the Control Unit sub-module scans packets coming for other interface link identifying those traveling to the same Clients, assigning priorities and parameters associated with all the different wireless links corresponding to the different associated Clients.
  • First process runs a MAC bridge according to the standard described in [6], packages received in the wired LAN interface (LAN Frame reception), are analyzed, separating those that go to each of the clients associated with the AP (WFI Link control) and easily each plot according to the destination indicated in the same, that is the MAC Bridge oriented sub block in figure 5.
  • the second process verifies the state of the transmission WiFi channel. Every time a package is sent, this process, in accordance with the priority, latency and bandwidth assigned to the client (client transmission parameter), selects the appropriate channel configuration according to the calculated parameters in the control process of the wireless link status. Described in Figure 4 is shown the flowchart where each one of the processes are clearly marked up. The flow started with the LAN frame reception, following with the WIFI packet identification and destination queuing frame manage, and finally the specific Client transmission parameters are added.
  • Figure 5 shows the process carried out on the main control unit of the 'Steering
  • FIG. 6 depicts a block specification, in order to clarify the process included in the invention.
  • the environment on which the method and procedure may offer an improvement in the optimization of the link radio is one on which an AP is attached to a services provider access line carrying high-capacity data transmission and it is responsible of distributing this service into a group of STAs located in an indoor environment, as for example a home network.
  • an AP distributes different services and user contents to several STAs located within the home through a Wireless Link.
  • One of the more important things about the procedure described on this invention is that the optimization is client focused and it is not transport protocol dependent. Data streams can use a lower loaded protocol like UDP without being affected by the prioritization process defined on WiFi Specifications. UDP throughput would be 15-20 percent higher than TCP because there is less protocol overhead associated with UDP compared to the associated overhead on TCP.
  • the first one is described as an indoor WiFi environment for delivering a Web-TV service or video on demand, on which the quality of the service should be optimized on each one of the associated Clients.
  • the third one is when there are several end customer services attached to same WiFi STA in order to show end customer level of prioritization.
  • Video-streaming indoor WiFi embodiment In this embodiment, there is an On
  • the TV signal is distributed through a wireless link to different associated Clients.
  • the Client configuration will allow the WiFi AP to have the information for managing the wireless link with the associated Client. This will provide a good overview of the service.
  • Client client 1 As an example and without precluding any other variables or parameters, the associated Clients parameters and requirements list are shown: Client client 1
  • Latency 0 //minimin latency
  • TV web server does not need to use a high loaded protocol like RTP for transmitting Video signals (RTP is a protocol that is defined on WiFi and can be easily prioritized) and in addition to that, TV transmissions can be received in different network elements using a very easy configuration and without cumbersome settings.
  • RTP is a protocol that is defined on WiFi and can be easily prioritized
  • Dynamically changing connection type embodiment In this embodiment one VoIP Client node is connected to the AP running 802.1 1 protocols. Due to VoIP, both uplink and downlink flows are performed through the AP. In this scenario there are bidirectional flows constantly present in the system which consume a portion of the wireless link capacity.
  • VoIP link services
  • the traffic prioritization should be changed.
  • the client is a web conference attendant, during the time of delivery of the talk it is needed to prioritize traffic in the direction of STA-> AP and at the time of a question, it could be switched to a full prioritization wireless channel.
  • a traffic prioritization process should be developed on both links in order to maintain the wireless traffic quality.
  • VoI P Several end customer services attached to same WIFI Client:
  • one WIFI Client node is connected to the AP running 802.1 1 protocols and the WiFi Client has several end customer services linked by a LAN connection. This is a good example of application of the procedure on which a single transmission channel based on the 802.1 1 standard must differ according to an external connection, and must be prioritized and optimized on the communication of each of the end customers.
  • FIG. 10 shows, of a schematic form, the embodiment described.
  • the initial set of parameters sent by the WIFI client to AP has to change to differentiate between the needs of the end connected devices partners, each of them identified by their ip-address or MAC.
  • Latency MAC1 0 minimum latency
  • MAC 1 and MAC 2 are the MAC address of the 2 devices (end - clients) connected to the STA.
  • AP must differentiate the services to the end points knowing their MAC address. From AP point of view, need to establish the level of prioritization, latency and symmetry based on the final destination address of the packets (MAC1 or MAC2). This feature clearly differentiates the procedure current optimization process and allows for flexible adaptation to heterogeneous environments.
  • the AP is connected to the fixed line service provider, which has more than 1 wireless devices connected.
  • the AP is the common node of an internal data communication process that has been established internally between two or more of their wireless associated Clients.
  • Figure 1 1 shows the architecture of this embodiment.
  • the AP is the common node, connected to the LAN and which has several wireless clients associated.
  • One of the associated Clients will act as, for instance, media HDTV server and the other ones will be the internal receivers of the HDTV media services.
  • AP connectivity such as web browsing.
  • the LAN co-existing services are sharing the wireless link system with the internal wireless Media TV distribution services and the prioritization scenario and parameters should be taken into account.
  • the prioritization is made on the AP steering bridge, it depends on the LAN external connection service whether the internal TV distribution has lower or higher priority.
  • the LAN services will have always higher priority than the internal wireless Media distribution services.
  • the internal TV distribution services can be higher prioritized on the 'Steering bridge' by the user, the user can configure its AP in order to have a reliable internal Media-TV wireless distribution network.
  • the HDTV associated Client when the HDTV associated Client starts a communication with its external web on demand service it sends to the AP a configuration set of parameters taking into account the kind of link services (HDTV) and the normal requirements of its wireless link. If, at that moment, an internal wireless Distribution service is switched on by the user, on which one internal client acts as server and another as internal Client, both, the uplink from the internal server to the AP traffic and downlink from the AP to the internal Client traffic should be prioritized.
  • HDTV link services
  • Latency 0 maxium latency
  • the AP is allowed to know dynamically what are the best environment and parameters in order to optimize the wireless link; everything is done and based on the associated Client requirements knowledge, independently of the transmission protocol used.
  • the proposed method takes into account the specific wireless client device requirements or the physical medium conditions and the initial client configuration for special services. For instance, in a wireless communication, it is not the same a client for receiving HDTV images than a smart phone for accessing to the internet.
  • One of the proposed solutions in the present invention is a method for estimating dynamically the SNR from the STAs point of view; the invention includes a procedure for transmitting the SNR measured on associated Client to the AP in order to improve the channel characteristics. It also includes procedure for calculating directly in AP the transmission rate per client in order to know exactly the wireless link situation. The maintenance of QoS parameters per client is achieved. Knowing the client characteristics and requirements for guaranteeing its QoS it is possible to adapt the wireless link in order to be more efficient and to achieve the most reliable possible wireless link, taking into account the dynamic channel quality changes. When a wireless link is interfered or a low QoS is detected, tools for taking the appropriate actions must be implemented. The invention copes with this issue taking into account the requirements of the associated clients.
  • the method copes with the WiFi transmitting problems for high data rate and real-time based services through the utilization of a managing entity on the wireless AP with different sets of channel access parameters in order to differentiate the services on the wireless clients connectAPed to the AP and sharing the wireless media.
  • Services such as premium content, real-time services, stored media services or low priority content services should be transported over the dynamic wireless channel but offering a reliable wireless link based on the clients prioritization parameters.
  • a good service should offer tiered QoS for gradual degradation, because of the dynamic wireless channel adaptation.
  • the invention solves the above issues and is made in order to guarantee QoS on 802.1 1 links when there are several clients connected on the same network (BSS).
  • the reception of channel status periodically is a proactive action to help improve the link quality quickly.
  • Transmission parameters adjusted to the traffic by final client signalling The optimization is client focused and not protocol dependent.
  • UDP User Data stream can use a lower loaded protocol like UDP without affected prioritization process.
  • UDP throughput will be 15-20 percent higher than TCP because there is less protocol overhead associated with UDP.
  • Wi-Fi CERTIFIEDTM for WMMTM - Support for Multimedia Applications with Quality of Service in Wi-Fi® Networks. Wi-Fi Alliance, September 1 , 2004

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  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention se rapporte à un procédé adapté pour optimiser une liaison sans fil et l'utiliser pour transmettre de la puissance et réduire des interférences. Le procédé selon l'invention comprend : un point d'accès qui est utilisé pour établir une communication sans fil avec une pluralité de dispositifs clients sans fil, l'un quelconque desdits dispositifs clients sans fil étant connecté au dit point d'accès par le biais d'une liaison sans fil. Le procédé selon l'invention comprend les étapes suivantes, consistant : à collecter des informations relatives à des caractéristiques de transmission de l'un quelconque desdits dispositifs clients sans fil, à propos du statut opérationnel d'une communication; et à adapter et à définir la priorité de ladite liaison sans fil dédiée, dans le but d'exécuter ladite optimisation de la liaison sans fil, sur la base desdites caractéristiques de transmission qui ont été collectées à partir de l'un quelconque des dispositifs clients sans fil. Le système selon l'invention est adapté pour mettre en œuvre le procédé selon l'invention. Le procédé selon l'invention est utilisé pour transmettre de la puissance et réduire des interférences.
PCT/EP2013/059837 2012-05-25 2013-05-13 Procédé et système pour optimiser une liaison sans fil et l'utiliser pour transmettre de la puissance et réduire des interférences WO2013174672A1 (fr)

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