WO2007086124A1

WO2007086124A1 - Qos control system

Info

Publication number: WO2007086124A1
Application number: PCT/JP2006/301236
Authority: WO
Inventors: Masahiko Nanri
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 2006-01-26
Filing date: 2006-01-26
Publication date: 2007-08-02

Abstract

A QoS control system for providing high quality of communication services. In this QoS control system, user QoS information outputted from an application layer interface (11) is inputted to a protocol decider (16) and to a QoS calculator (17). The protocol decider (16) decides protocols and parameters required for providing services, and notifies those protocols and parameters to the application layer interface (11) and to the interfaces of other layers via a control circuit (19). In this way, a QoS controller (7) can perform QoS controls of the respective layers. The layers periodically report their respective statuses to the QoS controller (7). When the status of a layer becomes deteriorated and the quality of communication service degrades, the QoS controller (7) adaptively updates the parameters of that layer or other layers so as to recover the quality of the communication service.

Description

Specification

QoS control system technology

TECHNICAL FIELD [0001] The present invention relates to a QoS (Quality of Service) control system that guarantees the quality of communication services, and in particular, to guarantee the quality of communication services including all layers from the physical layer to the application layer. It is related to the QoS control system.

Background art

Conventionally, in the communication field, QoS control technology has been widely used to guarantee the quality of communication services. In particular, in order to provide high-quality communication services, speeding up the data rate is an important factor. Quality assurance technology for the various communication services provided, that is, QoS control technology is an even more important factor. Become. As such a QoS control technique, for example, a technique for assuring the quality of various communication services by appropriately performing retransmission control of a wireless line is disclosed (for example, refer to Patent Document 1). According to this technology, real-time communication is performed by retransmitting the information of ATM (Asynchronous Transfer Mode) cells contained in abnormal wireless packets, excluding those with low priority for discarding, with wireless packets. Guarantee quality.

Patent Document 1: Japanese Patent Laid-Open No. 9-214507

Disclosure of the invention

Problems to be solved by the invention

However, the scope of conventional QoS control is mainly limited to the transport layer power and the data link layer. The lower physical layer and the upper application layer are not subject to QoS control. It has become. For example, taking voice calls as an example, if the temporal average value of the line quality is relatively good even if fading has occurred in the wireless transmission path during the call, 16QAM ( Higher level MCS (Modulation and Coding Scheme) such as 16 Quadrature Amplitude Modulation is selected. In this case, in the fading valley, that is, in an environment where the channel quality is momentarily poor, retransmission of the voice packet occurs, which causes delay and jitter. But the application layer Since higher layers such as the presentation layer and the presentation layer know the state of the physical layer, it is impossible to detect the state of these wireless links, and as a result, a large number of packets continue to be transmitted. . As a result, there are frequent interruptions and delays in calls due to congestion, and the quality of communication services felt by users is ultimately poor.

[0004] Also, QoS information varies depending on the type of service provided. For example, although in the case of a voice call required transmission rate is sufficient about several tens of kbps, also the required packet error one rate (PER) is also relatively mild conditions of about 10 ^2, against the delay and jitter The requirements are very strict. In other words, communication in voice calls must be guaranteed (Guarantee Type) communication that guarantees a certain delay and jitter! /,. In the case of data transmission such as FTP (File Transfer Protocol), the transmission rate is the best effort type, and the requirements for delay and jitter are moderate, but the packet error rate is low. However, error-free and strict conditions are required. These QoS conditions also have an impact on wired lines, but the impact on wireless lines is very large.

[0005] An object of the present invention is to provide a QoS control system that can provide a communication service with high quality by performing QoS control including the physical layer power including multiple layers up to the application layer. is there.

Means for solving the problem

[0006] The QoS control system of the present invention is a QoS control system that guarantees the quality of a communication service including all layers of the OSI layer, and includes a transmission device that provides the communication service and a reception that enjoys the communication service. Installed in at least one of the devices and the intermediate device that connects the transmitter and receiver, equipped with a QoS controller that realizes the quality assurance of the communication service. Accordingly, it adopts a configuration that defines user QoS for providing the communication service corresponding to the user.

The invention's effect

[0007] According to the QoS control system of the present invention, a QoS controller for performing QoS control is installed in at least one of the reception device, the transmission device, and the intermediate node that constitutes the communication system, and the communication system is classified according to the type of communication service. User QoS is defined in the QoS controller. This As a result, the QoS controller sets the required transmission rate, allowable delay, allowable packet error rate, allowable jitter, etc., which are the quality assurance conditions for the communication service to be provided, depending on the user QoS and hardware performance, type, and form. be able to.

[0008] Further, according to the QoS control system of the present invention, depending on the performance, type, and form of the QoS controller power user QoS, the protocol stack and parameters required for providing the communication service can be changed for each OSI layer. Is defined. Therefore, the transmission device, reception device, and intermediate node equipped with the QoS controller can perform QoS control for each layer, so that the operation status of each layer can be periodically reported to the QoS controller. it can. As a result, when the QoS controller detects a deterioration in the quality of the communication service due to a bad state of a certain layer, the QoS controller updates the parameters of the corresponding layer or other layers as appropriate to improve the quality of the communication service. Recovery can be achieved. That is, according to the QoS control system of the present invention, a QoS controller for performing quality assurance of communication services is installed in each hardware, and user QoS for performing communication services for each layer is defined. The communication quality can be guaranteed by including all layers.

Brief Description of Drawings

FIG. 1 is a network configuration diagram for realizing the QoS control system of the present invention.

[FIG. 2] A diagram showing the layer structure of each element in the network shown in FIG.

FIG. 3 is a diagram showing the relationship between the QoS controller applied to the present invention and each layer.

[Fig. 4] Diagram showing monitoring items and control items for each layer performed by the QoS controller shown in FIG. 3. [Fig. 5] Diagram showing QoS control items for each layer performed by the QoS controller shown in FIG.

[Fig. 6] Configuration of QoS controller applied to the present invention

[Fig.7] Diagram showing the relationship between the user QoS executed by the QoS controller shown in Fig. 6 and the contents of the communication service

FIG. 8 is a conceptual diagram showing how VoIP is initially set for a mobile phone (user B) in the QoS control system according to the second embodiment of the present invention.

FIG. 9 is a diagram showing control items for each layer performed in the QoS control system according to the second embodiment of the present invention.

[FIG. 10] Each layer force performed in the QoS control system of the second embodiment of the present invention A diagram showing the state of VoIP status reporting

FIG. 11 is a diagram showing a flow of physical layer QoS control performed in the QoS control system according to the second embodiment of the present invention.

FIG. 12 is a diagram showing a flow of QoS control in the data link layer performed in the QoS control system according to the second embodiment of the present invention.

FIG. 13 is a diagram showing a flow of QoS control in the presentation layer (application layer) performed in the QoS control system according to the second embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

[0010] <Summary of Invention>

The QoS control system of the present invention provides communication quality assurance to all or any one of a transmission device that provides communication services, a reception device that enjoys communication services, and intermediate nodes such as routers and access points. Install a QoS controller to do this. For each QoS controller, user QoS is defined for each service type for providing communication services to users. As a result, the QoS controller determines various conditions (for example, required transmission rate, permissible delay, permissible packet error rate, permissible jitter, etc.) that guarantee the quality of the communication service according to the performance, type, and form of user QoS and nodeware. Etc.) can be defined.

[0011] Furthermore, the QoS controller has a physical layer power in each of the hardware (that is, a transmission device, a reception device, and an intermediate node) for the OSI (Open System Interconnection: International Standardization Organization) layer up to the application layer. Separately, specify the protocols and parameters necessary for providing communication services. As a result, the QoS controller can perform QoS control individually for each layer. Therefore, each layer can periodically report its own status to the QoS controller. Therefore, when the quality of the communication service deteriorates due to the state of a certain layer being degraded, the QoS controller Alternatively, the quality of communication services can be restored by adaptively updating the parameters of other layers. For example, if the line condition deteriorates due to fading in the physical layer, the parameters of the presentation layer (application layer) can be updated to restore the quality of the communication service. [0012] Hereinafter, some of the embodiments of the QoS control system in the present invention will be described in detail with reference to the drawings. In the drawings used in the embodiments, the same components are denoted by the same reference numerals, and duplicate descriptions are omitted.

FIG. 1 is a configuration diagram of a network for realizing the QoS control system of the present invention. In the network configuration shown in Fig. 1, a mobile node (MN) 1 such as a mobile phone and a correspondent node (CN) 2 such as a fixed phone communicate with each other via the Internet 3 The situation is taken as an example. MN1 is connected to an access point (AP) 4 through a wireless line, and AP4 is connected to the Internet network 3 through a router 5. CN 2 is also connected to the Internet network 3 through a router 6. In this embodiment, the network configuration is not limited to a wireless transmission line, and can be applied to, for example, power line conveyance by a power line transmission line.

FIG. 2 is a diagram showing a layer configuration of each element in the network shown in FIG. In other words, FIG. 2 shows the layer configuration of MN1, CN2, AP4, and routers 5 and 6 shown in FIG. Figure 2 [As shown here, MN1, CN2, AP4, and Norator 5, 6ί, all based on the OSI reference model (i.e., application layer, transport layer, network layer, Data link layer and physical layer). However, since ΑΡ4 and routers 5 and 6 only serve as relay nodes, they actually have functions below the network layer.

As shown in Figure 3, the QoS controller 7 is connected to the application layer, transport layer, network layer, data link layer, and physical layer, and the status in each layer is regularly monitored. QoS controller 7 is notified. The QoS controller 7 integrates the information provided by each layer, and the required QoS (that is, required rate, allowable delay) defined by this information and the communication service provided to the user (hereinafter referred to as user QoS). , Allowable packet error rate, and allowable jitter). If the conditions of user QoS are met and there are any items, appropriate instructions are given to each layer to establish a communication service. Adaptively guarantee the quality of the screw.

FIG. 4 is a diagram showing monitoring items and control items of each layer performed by the QoS controller 7 shown in FIG. As shown in Figure 4, the application layer monitors and controls delay and jitter, and the transport layer monitors and controls TCP (Transmission Control Protocol) retransmission, packet arrival interval, packet loss rate, delay, and jitter. Do. The network layer monitors and controls the queue state (Queue state) of the data structure in which the previously input data is output first. The data link layer monitors and controls the number of data retransmissions. The physical layer monitors and controls SIR (Signal to Interference Ratio), Delay Spread, Doppler Frequency (fd), and BER (Bit Error Rate) / PER (Packet Error Rate).

FIG. 5 is a diagram showing QoS control items for each layer performed by the QoS controller 7 shown in FIG. That is, in this figure, the contents of “required rate”, “delay”, “packet error”, and “jitter” are shown for each layer of each layer. For example, the “required rate” is the QoS control of the audio Z video codec rate in the application layer, the TCP window size QoS control in the transport layer, and the queue priority (Queuing) in the network layer. Priority) and bandwidth allocation QoS control. The data link layer performs scheduler QoS control, and the physical layer performs MCS and SF QoS control. For “delay”, “packet error”, and “jitter”, QoS control as shown in the corresponding items in Fig. 5 is performed for each layer.

FIG. 6 is a configuration diagram of a QoS controller applied to the present invention. As shown in Figure 6, QoS controller 7 consists of application layer interface 11, transport layer interface 12, network layer interface 13, data link layer interface 14, physical layer interface 15, protocol determinator 16, QoS calculator 17 The information determining unit 18, the control circuit 19, the communication quality holding circuit 20, and the hardware information holding circuit 21 are provided.

Next, functions of each component of the QoS controller 7 shown in FIG. 6 will be described. Each layer interface 11, 12, 13, 14, and 15 exchanges information with the control circuit 19 regarding the monitoring items and control items for each layer as shown in FIG. Has a function. The application layer interface 11 uses user QoS information as a protocol. It also has a function of delivering to the determiner 16 and the QoS calculator 17. The protocol determiner 16 has a function of determining a protocol and parameters necessary for service provision. Based on the user QoS information, the QoS calculator 17 calculates the required transmission rate R, allowable delay T, allowable

It has a function to calculate required QoS such as th dl packet error rate P and allowable jitter T.

err j

[0020] The information determiner 18 calculates the calculation result of the QoS calculator 17 (that is, the required transmission rate R, the allowable delay,

th extension T, permissible packet error rate P, and permissible jitter T) to protocol determiner 16 dl err j

It has a function to notify. In addition, the communication quality maintaining circuit 20 includes transmission lines reported from the interfaces of each layer (that is, the application layer interface 11, the transport layer interface 12, the network layer interface 13, the data link layer interface 14, and the physical layer interface 15). It has a function to hold quality information. Further, the hardware information holding circuit 21 has a function of holding information such as a hardware buffer amount in the QoS controller 7. The control circuit 19 has a function of controlling each component of the QoS controller 7 based on user QoS information and performing QoS control.

Next, the operation flow of the QoS controller 7 shown in FIG. 6 will be described. The user QoS information output from the application layer interface 11 is input to the protocol determiner 16 and the QoS calculator 17. In addition, the protocol determiner 16 determines initial protocols and initial parameters necessary for service provision, and the interface of each layer (that is, the application layer interface 11, the transport layer interface 12, the network layer interface) through the control circuit 19. 13, The data link layer interface 14 and the physical layer interface 15) are notified of the protocols and parameters required to provide communication services.

[0022] Also, the required transmission rate R, the allowable delay T, the allowable packet, etc., depending on the QoS of the QoS calculator 17 user QoS and the hardware performance (for example, the amount of notch) previously stored in the QoS calculator 17 in advance. Calculate required QoS such as error rate P and allowable jitter T h dl err j

To do. These calculation results (that is, required transmission rate R, allowable delay T, allowable packet

th dl

The error rate P and the allowable jitter T) are input to the information determiner 18, respectively.

err j

[0023] Further, the communication quality maintaining circuit 20 includes interfaces of each layer (that is, an application layer interface 11, a transport layer interface 12, a network layer interface). 1), data link layer interface 14, and physical layer interface 15) report transmission path quality information (for example, SIR, delay spread, Doppler frequency, etc.). Holds information such as hardware noise amount in controller 7. Information held in the communication quality holding circuit 20 and the nodeware information holding circuit 21 is used in the protocol determiner 16 as necessary.

FIG. 7 is a diagram showing the relationship between the user QoS executed by the QoS controller 7 shown in FIG. 6 and the contents of the communication service. As shown in Fig. 7, user QoS is classified into five types, and the contents of various communication services are determined for each item. That is, the service type of the user QoS “l” is a voice call, and a specific service example is VoIP (Voice over Internet Protocol). The service type of user QoS “2” is interactive streaming, and a specific service example is a videophone. Furthermore, the service type of user QoS “3” is unidirectional streaming, and a specific service example is Internet TV. The service type of user QoS “4” is data communication, and a specific service example is file transfer. Furthermore, the service type of the user QoS “5” is real-time data communication, and a specific service example is a communication battle game.

[0025] The service contents of "required transmission rate", "allowable delay", "packet loss Z error", and "jitter" for each item of user QoS are numerical values as shown in the corresponding items. ing. However, each QoS value shown in FIG. 7 is an example, and the actual value is appropriately determined depending on the hardware performance of the QoS controller and the service provided.

Next, a specific example of the QoS control system in the present invention will be described as a second embodiment. That is, in the second embodiment, an operation at the time of providing a VoIP service by a voice call using VoIP will be described. The second embodiment described below is based on the following four items. 1. The network configuration is as shown in Figure 1 above. 2. A call between a landline (user A) and a mobile phone (user B). 3. Assume that only mobile phones have a QoS controller, and fixed phones and intermediate nodes (for example, access point HAP) and routers do not have a QoS controller. 4. Q Only the physical layer, data link layer, and presentation layer are subject to oS control.

FIG. 8 is a conceptual diagram showing how VoIP is initially set for a mobile phone (user B) in the QoS control system according to the second embodiment of the present invention. The configuration of the QoS control system in the second embodiment shown in FIG. 8 is the same as the configuration in FIG. 3 and FIG. 6 described above, and therefore the same reference numerals are given. In FIG. It is. Therefore, for example, the application layer interface 11 in FIG. 6 is read as being synonymous with the application layer 11 in FIG. The same applies to the transport layer 12, the network layer 13, the data link layer 14, and the physical layer 15 in FIG.

Next, the initial setting operation of VoIP will be described based on FIG. 8 with reference to FIG. First, at the start of the communication service, the application layer 11 notifies the QoS controller 7 of “user QoS designation” that the VoIP service is started. Then, the QoS controller 7 determines the required QoS (that is, the required transmission rate R, the allowable delay T, the allowable packet error rate P, based on the contents of the communication service included in the notified “user QoS specification”.

th dl err, and allowable jitter T). In the example of Embodiment 2, the QoS controller 7 includes the required transmission rate R ≥ 83 kbps, the allowable delay T ≤ 300 msec, and the allowable packet error rate.

th dl

P ≤ 0.05 and allowable jitter T ≤ 100msec are determined as required QoS.

err j

[0029] Further, at the same time when the required QoS is determined, the protocol determiner 16 determines the protocol and parameters necessary for providing the service, and passes through the control circuit 19 to each layer (that is, the application layer 11, the transport). “Protocol designation” and “parameter designation” are instructed to the layer 12, the network layer 13, the data link layer 14, and the physical layer 15).

[0030] Here, as an example, G.711 (codec rate = 64kbps ゝ required transmission rate R = 83kbps) is applied to the audio codec of the presentation layer (that is, application layer 11).

th

Apply SIP (Session Initiation Protocol), RTP (Real-time Transport Protocol), and RTCP (RTP Control Protocol) to the session protocol of application layer 11.

[0031] Further, UDP (User Datagram Protocol) is applied to the transport layer 12, and IPv6 (IP version 6) is applied to the network layer 13, respectively. Furthermore, since it is important for VoIP to have a lower latency than a low error rate, the parameters in the data link layer 14 are For both uplink and downlink, the maximum number of retransmissions of HARQ (High Availability Resolution Queue) is set to a low number (for example, 2 times) and the number of channels used is "1". In addition, the code division multiple access (CDMA) method is applied to the modulation method of the physical layer 15, and low rate MCS (for example, QPSK R = 1/2) with low QPSK (Quadrature Phase Shift Keying). ) And high SF (for example, SF = 128). Note that these protocols and parameters are merely examples, and are not necessarily limited to these parameter values.

FIG. 9 is a diagram showing control items for each layer performed in the QoS control system according to the second embodiment of the present invention. For example, in the application layer 11, the voice codec is controlled by G.711 or G.729 parameters. In the data link layer 14, the maximum number of radio frame retransmissions is controlled with a parameter 1 to L0, and the number of channels is controlled with parameters 1 to 3. Furthermore, in the physical layer 15, the MCS is controlled by parameters of QPSK R = l / 2, QPSK R = 3/4, 16QAM R = l / 2, 16QAM R = 3/4, and 4, 8, 1 6, 32 , SF force control with 64, 128 bit parameter.

Next, a VoIP status report performed from each layer to the QoS controller 7 will be described. FIG. 10 is a diagram showing a state of VoIP status reporting from each layer performed in the QoS control system according to the second embodiment of the present invention. In the session layer (that is, the application layer 11), it is reported to the QoS controller 7 as the average delay time and jitter information delay of the downlink voice packet observed by RTCP. In addition, the network layer 13 reports a “Queuing Buffer status report” of the voice packet to the QoS controller 7.

Further, the data link layer 14 reports the average throughput of the wireless channel and the average number of retransmissions based on HARQ to the QoS controller 7 as “retransmission number 'throughput report”. Further, the state of the radio transmission path (that is, PER, CQK Channel Quality Indicator) is reported from the physical layer 15 to the QoS controller 7 as “PER, CQI report”. CQI refers to a parameter that indicates the line status in a radio link, such as SIR, delay spread, or Doppler frequency.

[0035] Next, based on an example in which the average throughput of the wireless line dropped to 40 kbps, The flow of layer QoS control will be described. In the following description, the flow of QoS control operations in the physical layer 15, data link layer 14, and presentation layer (application layer 11) is described. FIG. 11 is a diagram showing the flow of physical layer QoS control performed in the QoS control system of the second embodiment of the present invention. FIG. 12 is a diagram showing a flow of QoS control in the data link layer performed in the QoS control system according to the second embodiment of the present invention. Further, FIG. 13 is a diagram showing a QoS control flow of the presentation layer (application layer) performed in the QoS control system of the second embodiment of the present invention. The flow of QoS control in each layer will be described below with reference to the drawings of FIGS. 11, 12, and 13 with reference to the drawings of the QoS controller of FIG.

First, the flow of QoS control in the physical layer 15 will be described based on FIG. First, the information determiner 18 in the QoS controller 7 that has received notification from the data link layer 14 that the throughput of the wireless line has fallen below the required transmission rate (for example, R = 40 kbps)

The data change request is notified to the protocol determiner 16 (also called parameter determiner). Then, the protocol determinator (parameter determinator) 16 examines whether or not a change to a higher MCS (for example, 16QAM R = lZ2) is possible based on the CQI information from the communication quality maintenance circuit 20, and If it is determined that the change can be made, “MCS change request” is transmitted to the physical layer 15 via the control circuit 19. Then, the physical layer 15 that has received the “MCS change request” establishes communication with the new MCS through negotiation with the access point (AP).

[0037] If the protocol determinator (parameter determinator) 16 determines that the change to the higher MCS is impossible, the protocol determinator (parameter determinator) 16 determines the SF based on the CQI information. When a change (for example, SF = 64) is examined and it is determined that the change is possible, the “SF change request” is transmitted from the QoS controller 7 to the physical layer 15. In response to the “SF change request”, the physical layer 15 establishes communication with the new SF by negotiation with the access point (AP). If it is determined that the SF cannot be changed, the QoS control of the physical layer 15 is stopped and the QoS control of the data link layer 14 is attempted.

Next, the flow of QoS control in the data link layer 14 will be described based on FIG.

In QoS control of data link layer 14, first, Qo receives a notification from data link layer 14 that the throughput of the radio line has fallen below the required transmission rate (for example, R = 40kbps). The information determiner 18 in the S controller 7 notifies the protocol determiner 16 of a parameter change request. Then, the protocol judgment unit 16 confirms the usage state of the radio resource held in the communication quality holding circuit 20. Here, if there is a surplus channel in the radio resource, the QoS controller 7 sends a scheduling change to the data link layer 14 via the control circuit 19 so that a surplus channel is newly allocated in addition to the channel currently in use. "Request" is issued. This improves the throughput for the additional channels. Here, the data link layer 14 that has received the instruction to change the channel assignment newly establishes communication by channel assignment by negotiation with the access point (AP).

On the other hand, when the protocol decision unit 16 determines that the channel assignment cannot be changed, the QoS controller 7 tries the upper layer QoS control. However, the network layer 13 and transport layer 12 protocols do not have QoS control means to reduce the transmission rate, so we try QoS control in the presentation layer (ie, application layer 11).

Next, the flow of QoS control in the application layer 11 will be described based on FIG. In the application layer 11 QoS control, first, the data link layer 14 also notifies that the wireless channel throughput has fallen below the required transmission rate (for example, R = 40 kbps).

th

In response, the information determination unit 18 in the QoS controller 7 notifies the protocol determination unit 16 of a parameter change request. Then, the control circuit 19 of the QoS controller 7 transmits an instruction of “voice codec change request” to the effect that the low-bit-rate voice codec is used to the application layer 11. At the same time, QoS controller 7 changes the definition of the required transmission rate R

th

To do. Here, as an example, a request to use G. 729 (codec rate 8 kbps, required transmission rate 27 kbps) is sent to the application layer 11.

Then, the application layer 11 that has received the instruction to change the voice codec notifies the session to that effect. Sessions in the application layer 11 use the SIP reinvite (Invite) function to negotiate media with the partner node and establish communication using the new voice codec. As a result of such control, the transmission rate of the wireless line remains at 40 kbps previously notified to the QoS controller 7 by the data link layer 14, but a stable voice call service can be provided by changing the voice codec itself. Fruit Appear.

[0042] If the media negotiation fails because the fixed phone (User A) does not implement a low-rate codec of 40kbps or less such as G.729, the fixed phone (User A) and the mobile phone Media negotiation can be achieved with the lowest rate audio codec that both (User B) can implement. In addition, if the codec rate is already lower than the lowest codec and the codec rate cannot be lowered, the QoS controller 7 does nothing.

[0043] Summary of the Present Invention>

As described in Embodiment 1 and Embodiment 2 above, the QoS control system of the present invention connects a transmission device that provides a communication service, a reception device that enjoys the communication service, and a connection between the transmission device and the reception device. QoS controllers are installed for all or some of the intermediate node devices, and user QoS corresponding to the type of communication service to be provided is defined in each QoS controller. As a result, the QoS controller enables required QoS (for example, required transmission rate, allowable delay, allowable packet error rate, and allowable jitter, which are the quality assurance conditions of the communication service to be provided, depending on the performance, type, and form of user QoS and nodeware. Etc.) can be defined.

[0044] Further, the QoS controller can define protocol stacks and parameters necessary for providing communication services according to the performance, type, and form of user QoS and nodeware. Therefore, a transmission device, a reception device, and an intermediate node equipped with a QoS controller can define a protocol stack corresponding to the OSI 7 layer model and perform QoS control for each layer. As a result, the transmission device, the reception device, and the intermediate node can periodically report the operation state of each layer to the QoS controller.

[0045] Therefore, when the QoS controller detects a deterioration in the quality of a communication service due to a state of a certain layer, the QoS controller restores the parameter of the corresponding layer or another layer appropriately to restore the quality of the communication service. Can be achieved. For example, if the line condition deteriorates due to fading in the physical layer, the parameters of the application layer can be updated to restore the quality of the communication service. Note that the QoS controller is When updating a parameter, the parameter power of the physical layer is also prioritized, and if it is difficult to update the parameter of that layer, the parameter update of the higher layer is attempted.

[0046] This specification is based on Japanese Patent Application No. 2004-339654 filed on Nov. 24, 2004. All this content is included here.

Industrial applicability

[0047] As described above, the QoS control system according to the present invention has a QoS controller that performs quality assurance of communication services in each hardware, and user QoS that provides communication services is assigned to each layer. Because it is set, it is possible to guarantee the quality of communication services by including all layers. Therefore, it can be effectively used in the communication field with a high communication quality level.

Claims

The scope of the claims

[1] A QoS control system that guarantees the quality of communication services by including each layer of the OSI layer,

It is installed in at least one of a transmission device that provides the communication service, a reception device that enjoys the communication service, and an intermediate device that connects the transmission device and the reception device, thereby realizing quality assurance of the communication service. A QoS control system that defines a user QoS for providing a communication service corresponding to a user according to a type of the communication service.

[2] The QoS controller is configured to realize quality assurance of the communication service provided by at least one of the user QoS and the hardware performance, type, and form of the device including the QoS controller. The QoS control system according to claim 1, wherein the QoS is defined.

[3] The QoS control system according to claim 2, wherein the required QoS is at least one of a required transmission rate, an allowable delay, an allowable packet error rate, and an allowable jitter.

[4] The QoS controller is configured to realize quality assurance of the communication service provided by at least one of the user QoS and the hardware performance, type, and form of the device including the QoS controller. The QoS control system according to claim 1, wherein the necessary protocol stack and parameters are defined.

5. The QoS control system according to claim 4, wherein the protocol stack is defined to perform QoS control for each layer of an OSI hierarchical model of a device including the QoS controller.

6. The QoS control system according to claim 5, wherein each layer of the OSI hierarchical model periodically notifies the QoS controller of its own state.

[7] When the QoS controller detects a deterioration in the quality of the communication service due to a bad state of an arbitrary layer, the QoS controller updates the parameter of the layer or another layer to restore the quality of the communication service. The QoS control system according to claim 5.

[8] When updating the parameter, the QoS controller preferentially updates the parameter tag of the physical layer at the lowest level, and when it is difficult to update the parameter in the hierarchy, the QoS controller 8. The QoS control system according to claim 7, wherein the QoS control system tries to update the parameters of the hierarchy.