KR20140036901A - Integrated control method and system for quality of service in wimax and lte network - Google Patents

Abstract

Provided are an integrated control system and method for integrally controlling QoS in WiMAX and LTE networks. Thereby, the QoS of two networks is controlled by converting a WiMAX QoS parameter based on an LTE QoS parameter in an integrated base station without affecting a system of an LTE network. The maximum jitter parameter of the WiMAX QoS parameter is used for controlling the QoS in the integrated base station without the influence of the system of the LTE network. [Reference numerals] (111) LTE QoS parameter receiving unit; (112) IP flow receiving unit; (113) WiMAX QoS parameter selection unit; (114) Parameter conversion unit; (115) Jitter control unit; (116) QoS control unit; (117) LTE QoS parameter correction unit

Description

Integrated control method and system for quality of service in WiMAX and LTE network}

The present invention relates to an apparatus and method for providing a quality of service (QoS) of a worldwide interoperability for microwave access (WiMAX) and long term evolution (LTE) network.

Operators providing wireless mobile communication services or wireless network services control the QoS to provide subscribers with different classes of services requiring different QoS. QoS control includes static QoS control performed when a terminal accesses a network and dynamic QoS control performed when a new service is provided after connection.

Representative QoS mechanisms of LTE include service data flow (SDF) QoS and evolved packet system bearer (EPS bearer) QoS.

When the service provider recognizes the service class and service type of the LTE subscriber and controls the Internet protocol (IP) flow for each user, the transmission path of the user traffic in the EPS becomes an EPS bearer, and according to QoS, different EPS bearers Is generated. On the other hand, IP flows having the same quality of service are mapped to the SDF, and this SDF becomes a unit for applying QoS rules reflecting the policy of the operator.

LTE controls QoS in both the wireless section and the core network.However, unlike LTE, WiMAX only defines the QoS in the wireless section and the QoS parameters of LTE and WiMAX are defined differently. Had. In this case, there is a problem in that network equipment investment is overlapped to control QoS of different systems, network efficiency is reduced, and the control system is complicated.

Accordingly, an embodiment of the present invention provides an integrated control system and method for integrally performing QoS control of WiMAX and LTE networks.

According to an embodiment of the present invention, a method for integrating and controlling QoS of a WiMAX network and an LTE network is provided. QoS control method of the WiMAX network and LTE network, analyzing the service flow to be transmitted to the WiMAX terminal, converting the QoS parameters of the LTE network to the QoS parameters of the WiMAX network based on the analysis result, the converted QoS parameters When the maximum jitter parameter is included, determining whether the preset jitter value can be used for WiMAX QoS control, and controlling the QoS for the WiMAX terminal according to the converted QoS parameter.

According to another embodiment of the present invention, there is provided a wireless access unit for integrating and controlling QoS of a WiMAX network and an LTE network. The wireless access unit that collectively controls the QoS of the WiMAX network and the LTE network includes an IP flow receiver for receiving a service flow to be transmitted to a WiMAX terminal, and based on a result of analyzing the service flow, QoS parameters of the LTE network are determined. A QoS parameter converting unit for converting to a QoS parameter of a WiMAX network, a jitter control unit for determining whether a preset jitter value can be used for WiMAX QoS control when the converted QoS parameter includes a maximum jitter parameter, and the converted The QoS control unit for controlling the QoS for the WiMAX terminal according to the QoS parameters.

According to an embodiment of the present invention, the QoS of two networks can be controlled by converting the QoS parameters of the WiMAX network based on the QoS parameters of the LTE network in an integrated base station (wireless access unit) without affecting the system of the LTE network. have. In addition, the maximum jitter parameter of the WiMAX QoS parameters can be used for QoS control in the integrated base station without being influenced by the LTE system.

1 is a diagram illustrating a downlink QoS structure of an LTE network.
2 is a diagram illustrating an uplink QoS structure of an LTE network.
3 is a diagram illustrating an integrated QoS control system according to an exemplary embodiment of the present invention.
4 is a block diagram of an integrated base station according to an embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, a terminal is referred to as a mobile terminal (MT), a mobile station (MS), a subscriber station (SS), a portable subscriber station (PSS) an access terminal (AT), a user equipment (UE), and the like, and may include all or some of functions of MT, MS, SS, PSS,

In addition, the base station (BS) is a Node B (Node B), an advanced Node B (evolved Node B, eNB), access point (access point, AP), radio access station (radio access station, RAS), transmission and reception base station may refer to a base transceiver station (BTS), a mobile multihop relay (MMR) -BS, or the like, and may include all or a part of functions of a NodeB, eNB, AP, RAS, BTS, MMR-BS, and the like.

1 and 2 are diagrams illustrating a QoS structure of an LTE network.

1 and 2, the QoS of LTE is SDF defined as IP 5-tuple (Source IP, Destination IP, protocol IP, Source Port, Destination Port), and one or more SDFs in the form of tunneling mobile core network It is provided in EPS bearer units for delivery through.

Referring to FIG. 1, in the case of downlink traffic, QoS control of an SDF unit is performed in a packet data network gateway (P-GW), and traffic is transmitted to the terminal along the EPS bearer after the P-GW.

Referring to FIG. 2, in the case of uplink traffic, QoS control in units of SDF is performed at the UE, and the traffic is then transmitted to the P-GW through tunneling of the EPS bearer.

That is, QoS control of the SDF level is performed at the UE and the P-GW, and QoS control at the EPS bearer level is performed at the eNB and the serving gateway (S-GW).

Looking at the functions of the S-GW and P-GW through the structure of the LTE network, the LTE network includes an LTE entity and an evolved packet core (EPC) entity.

The LTE entity has a UE and an eNB, where the UE connects with the eNB via an air interface and the eNB provides a user with an air interface. That is, the LTE entity is a device that handles an evolved-universal terrestrial radio access network (E-UTRAN) related technology in the LTE network.

When the UE accesses the LTE network, an EPS bearer is generated from the UE to the P-GW (UE-eNB-S-GW-P-GW). The EPS bearer is a general packet radio service (GPRS) tunneling protocol (GTP) type tunnel and several EPS bearers may be generated for each UE.

EPS bearers have a default bearer and a dedicated bearer. The default bearer is an EPS bearer generated when the UE is newly connected with the PDN, and may be maintained until the PDN connection is terminated. A dedicated bearer is an EPS bearer that is generated on-demand when the service is additionally executed after the UE is connected to the PDN, and may be destroyed when the service is terminated.

Various kinds of traffic, namely IP flows, are transmitted through the EPS bearer. At this time, IP flow is divided into 5-tuples of a packet. When a UE uses an application service (webpage access, game, VoIP, etc.), traffic is generated and various IP flows exist according to the application service used.

EPC entities include P-GW and S-GW. The S-GW, which is an end point of the E-UTRAN and the EPC, becomes an anchoring point for handover between eNBs and handover between 3GPP systems, and the P-GW is connected to the S-GW to connect the UE to an external packet data network ( It connects to a packet data network (PDN) network and provides packet filtering. That is, the EPC entity is a part that deals with core network (wired) related technologies from the eNB to the P-GW in the LTE network.

The services provided in the LTE network are largely divided into a guaranteed bit rate (GBR) type and a non-guaranteed bit rate (non-GBR). The GBR type, together with the maximum bit rate (MBR), defines a minimum guaranteed bandwidth that must be provided in any case. The non-GBR type is not guaranteed for performance, only the allowable MBR is determined.

LTE services of GBR type and non-GBR type are defined in units of SDF and EPS bearer, respectively, and are summarized in [Table 1]. Referring to [Table 1], the non-GBR type LTE service sets the aggregated maximum bit rate (aggregated MBR, AMBR) in order to prevent multiple bearers from excessively using network resources.

Service Type QoS provision unit parameter GBR SDF or EPS Bearer QCI
DL maximum bit rate
UL maximum bit rate
DL guaranteed bit rate
UL guaranteed bit rate Non-GBR SDF or EPS bearer QCI SDF only DL maximum bit rate
UL maximum bit rate Aggregate EPS Bearer UE-AMBR
APN-AMBR

In the LTE network, AMBR can ensure that the sum of bandwidths of several EPS bearers does not exceed a certain level. The AMBR may be set in units of UEs or in units of access point names (APNs).

For example, UE-AMBR represents the total bandwidth of non-GBR LTE services available in the same UE, and APN-AMBR is the maximum bandwidth that can be shared by non-GBR bearers in the same PDN. In this case, when the UE has several PDN connections, the sum of APN-AMBR of each PDN may not exceed the UE-AMBR.

In LTE service, a QoS class identifier (QCI) parameter is used to indicate a service class. QCI can be used for priority based traffic scheduling in transit intervals as well as gateways. QCI has a value from 1 to 9, and the characteristics of traffic according to each QCI value are summarized in [Table 2].

QCI ResourceType Priority Packet Delay Budget Packet error
Loss rate Example Services One 2 100 ms 10 ^-2 Conversational Voice 2 GBR 4 150 ms 10 ^-3 Conversational Video (Live Streaming) 3 3 50 ms 10 ^-3 Real Time Gaming 4 5 300 ms 10 ^-6 Non-Conversational Video (Buffered Streaming) 5 One 100 ms 10 ^-6 IMS Signaling 6 6 300 ms 10 ^-6 Video (Buffered Streaming)
TCP-based (eg, www, e-mail, chat, ftp, p2p file sharing, progressive video, etc.) 7 Non-GBR 7 100 ms 10 ^-3 Voice,
Video (Live Streaming)
Interactive Gaming 8 8 300 ms 10 ^-6 Video (Buffered Streaming) 9 9 TCP-based (e.g., www, e-mail, chat, ftp, p2p file sharing, progressive video, etc.)

Unlike LTE, WiMAX controls QoS only in the radio section from the terminal to the base station. In the WiMAX network, QoS in the core network is not defined, but it is assumed that the IP differentiated service (DiffServ) is used.

QoS parameters for WiMAX include minimum reserved traffic rate (MRTR), maximum sustained traffic rate (MSTR), maximum latency, maximum jitter, and traffic. There is a traffic priority, and the service flow type is defined using these WiMAX QoS parameters.

WiMAX service flow types defined by the WiMAX QoS parameters include unsolicited grant service (UGS), extended real-time polling service (ertPS), real-time polling service (rtPS), and non-real-time polling service (nrtPS). BE is the best effort, and each of these services is for resource allocation. They are used for different kinds of application services.

UGS is a service that guarantees resources by using fixed bandwidth allocation, such as periodically providing a fixed size allocated slot without any contention or request. rtPS, ertPS and nrtPS are related to the resource allocation method by polling, rtPS is the resource allocation method for real-time traffic, ertPS is the resource allocation method to support a fixed variable bit rate, and nrtPS is used for non real-time traffic. It is a service of resource allocation method. BE is for general traffic such as e-mail. It is a resource allocation service that provides the best service, although not guaranteed.

WiMAX service flow types defined by WiMAX QoS parameters are shown in Table 3 below.

Service flow type mrtr mstr Max latency Max jitter Traffic priority Targeted traffic Ugs X X X Constant bit rate (CBR) services,
TDM services ertPS X X X x X VoIP with silence suppression or activity detection rtPS X x x X Streaming audio and video nrtPS X X X File transfers be x X Web browsing, email

Referring to Table 3, the UGS service flow, defined as MSTR, maximum latency, and maximum jitter, is used for services that provide a constant bit rate (CBR) or time division multiplexing services (TDM services). Can be applied. The ertPS service flow, which is defined as MRTR, MSTR, maximum latency, maximum jitter, and traffic priority, can be applied to voice over internet protocol (VoIP) to which silence suppression or activity detection is applied. The rtPS service flow, defined by MRTR, MSTR, maximum latency and traffic priority, can be applied to streaming audio and video. NrtPS service flows defined by MRTR, MSTR and traffic priority can be applied to file transfer, and BE service flows defined by MSTR and traffic priority can be applied to web browsing or email. Can be.

The service QoS type defined in LTE is defined by the QCI value. According to an embodiment of the present invention, a WiMAX service flow type may be defined according to an LTE QCI value, and WiMAX service flow types corresponding to the LTE QCI value are summarized in [Table 4].

LTE service Description QCI WiMAX
Service flow type
GBR Conversational Voice One UGS, ertPS Conversational Video (live streaming) 2 rtPS Real-time gaming 3 rtPS Non-conversational video (buffered streaming) 4 nrtPS
Non-GBR IMS signaling 5 rtPS Video (buffered streaming) TCP based 6 nrtPS Voice, video (live streaming), interactive game 7 rtPS Premium bearer for video (buffered streaming) TCP based 8 nrtPS Default Bearer for video TCP based 9 BE

The following describes an integrated QoS control system that can control the WiMAX QoS in the LTE QoS control system by implementing the WiMAX QoS using the QoS parameters of the LTE.

3 is a diagram illustrating an integrated QoS control system according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the integrated QoS control system 100 includes an unified base station (UBS) 110, a policy based gateway (PBGW) 120, a subscriber server, and a mobility management entity (home). subscriber server-mobility management entity (HSS-MME) 130, and a policy and charging rules function (PCRF) 140.

The integrated base station 110 performs a wireless access function of a user equipment (UE) as a wireless transmit receive unit (WTRU). UEs such as mobile phones, smartphones, tablet personal computers, dongles, or laptops using wireless Internet may receive LTE or WiMAX services through the integrated base station 110. . In addition, since the integrated base station 110 may perform both the role of the eNB of LTE and the role of BS of WiMAX, the integrated base station 110 is a network element to which QoS parameters of the LTE network and QoS parameters of the WiMAX network may be respectively applied. to be.

The policy-based gateway 120 performs the functions of P-GW and S-GW of LTE. In addition, unlike the integrated base station 110, since the WiMAX network controls the QoS only in the wireless section, only the QoS parameters of the LTE can be applied.

The HSS-MME 130 is an entity that controls the wireless access of the UE. The HSS-MME 130 stores user profiles and user subscription information for user authentication, and stores QoS parameters generated based on the user profile and user subscription information from the service provider. Are provided. Thereafter, when the UE initially connects and a default bearer is created, static QoS control may be performed by passing default bearer QoS parameters to the unified base station 110 and the policy-based gateway 120.

The PCRF 140 is a policy and billing control entity, and provides a function of controlling and determining policies and billing. In this case, the PCRF 140 reflects the policy and charging control (hereinafter, referred to as 'PCC') rule as a QoS parameter to the dedicated bearer, and delivers it to the integrated base station 110 and the policy-based gateway 120. Dynamic QoS control can be performed.

In addition, the integrated QoS control system 100 may include an application function (hereinafter referred to as 'AF') 150 or a subscription profile repository (hereinafter referred to as 'SPR') 160. have.

Hereinafter, the function of each component included in the integrated QoS control system 100 will be described in detail.

4 is a block diagram of an integrated base station according to an embodiment of the present invention.

Referring to FIG. 4, the integrated base station 110 includes an LTE QoS parameter receiver 111, an IP flow receiver 112, a QoS parameter converter 113, a jitter controller 114, and a QoS controller 115. And the LTE QoS parameter correction unit 116.

The unified base station 110 may convert the LTE QoS parameters received from the HSS-MME 130 or the PCRF 140 into WiMAX-based QoS parameters. This is for the UE of the WiMAX network since the integrated QoS control system 100 is performed based on LTE. The integrated base station 110 maps QoS parameters of the LTE network and QoS parameters of the WiMAX network as shown in Table 1.

First, the LTE QoS parameter receiver 111 receives the QoS parameters of LTE from the HSS-MME 130 or the PCRF 140. The QoS parameters of the LTE downloaded from the PCRF 140 or the HSS-MME 130 may be used for QoS control of the LTE through the QoS control unit 115.

On the other hand, if there is a UE of the WiMAX network, in order to control the QoS of the WiMAX, the QoS parameters of the LTE may be mapped to the QoS parameters of the corresponding WiMAX according to [Table 1]. That is, the IP flow receiver 112 receives the service flow to be transmitted to the UE of the WiMAX, analyzes the service flow received from the QoS parameter converter 113, and then, based on the analysis result, determines the QoS parameters of the LTE network from the WiMAX network. The QoS parameter can be converted by mapping to the QoS parameter of.

At this time, the MRTR of WiMAX corresponds to the GBR of LTE, and the MSTR of WiMAX corresponds to the MBR of LTE. In addition, the traffic priority of WiMAX may be determined by the QCI priority value of QCI of LTE. The maximum delay time of WiMAX may be determined by a delay budget value defined in LTE's QCI.

Referring to [Table 4], the mapping parameter for converting the QoS parameter of the LTE into the QoS parameter of the WiMAX according to the service flow type of the WiMAX in the QoS parameter conversion unit 113 will be described.

UGS, which was defined as MSTR, maximum latency, maximum jitter and traffic priority, is defined as LTE QoS parameters MBR, QCI and QCI priority 2 based on delay budget, and maximum jitter is defined separately. ErtPS, defined as MRTR, MSTR, maximum latency, maximum jitter, and traffic priority, is defined as QCI and QCI priority based on LTE QoS parameters, GBR, MBR, and delay specification, and maximum jitter is defined separately. RtPS, defined as MRTR, MSTR, maximum latency and traffic priority, is defined as QCI and QCI priority based on LTE QoS parameters GBR, MBR, and delay specifications. NrtPS, which was defined as MRTR, MSTR, and traffic priority, is defined as GBR, MBR, and QCI priority, which are LTE QoS parameters. BE, which was defined as MSTR and traffic priority, is defined as LTE QoS parameters MBR and QCI priority 9.

 Referring to [Table 4], the maximum jitter parameter is required to provide UGS or ertPS type WiMAX service, but no mapping rule is explicitly defined. In this case, since maximum jitter is not defined in the QoS parameter of LTE, a method other than the mapping rule defined in [Table 4] is required to support this.

To this end, first, the jitter controller 114 determines whether the integrated base station 110 can use the maximum jitter parameter for WiMAX QoS control. That is, it is determined whether the maximum jitter parameter is included in the QoS parameter converted by the QoS parameter conversion unit 113. Then, if the maximum jitter parameter is included in the converted QoS parameter, it is determined whether the jitter value preset in the jitter controller 114 is applicable to the service flow received from the UE.

For example, if the maximum jitter is a service type corresponding to voice communication (QCI 1), and the preset jitter value can be used for each operator, the QoS control unit 115 may use the preset jitter value for WiMAX QoS control. ).

However, when the operator receives a service flow with a QCI value different from the preset jitter value, the jitter value needs to be set for each service. In this case, (1) a method of defining QoS using a service class name, and inputting a plurality of jitter values for each service class to a jitter input unit (not shown) included in the jitter control unit 114, ( 2) A method of receiving an individual jitter value suitable for each service flow type from the HSS-MME 130 or the PCRF 140 through a jitter receiver (not shown) included in the jitter controller 114 is possible.

In the case of (2), the jitter control unit 114 transmits the reception result of the individual jitter value suitable for each service flow type to the LTE QoS parameter correction unit 116. The LTE QoS parameter reviser 116 then determines if there is an LTE QoS parameter with the same QCI value as the individual jitter value and can modify the QoS parameter of that LTE network, if any.

Thereafter, the WiMAX QoS parameters determined by the QoS parameter converter 113 and the jitter controller 114 are used by the QoS controller 115 to control the QoS for the UE of WiMAX.

The types of LTE QoS and WiMAX QoS control performed in the integrated base station 110 and the policy-based gateway 120 are summarized in [Table 6].

The functions of the HSS-MME 130 and the PCRF 140 are summarized in [Table 7].

In addition, the AF 150 may interwork with the PCRF 140 to provide QoS information required by an application and state information of a service session, and receive control results and event information. The SPR 160 may manage subscriber policy information so that the PCRF 140 may determine a subscriber-specific or service-specific policy.

As described above, according to an embodiment of the present invention, QoS of two different networks can be controlled by converting WiMAX QoS parameters based on LTE QoS parameters in the integrated base station without affecting the system of the LTE network. In addition, the maximum jitter parameter of the WiMAX QoS parameters can be used for QoS control in the integrated base station without being influenced by the LTE system.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (10)

In a method of integrating and controlling the quality of service (QoS) of a WiMAX network and a long term evolution (LTE) network,
Analyzing a service flow to be transmitted to a WiMAX terminal;
Converting QoS parameters of the LTE network into QoS parameters of the WiMAX network based on the analysis result;
Determining whether a preset jitter value can be used for WiMAX QoS control when the converted QoS parameter includes a maximum jitter parameter, and
Controlling QoS for the WiMAX terminal according to the converted QoS parameter
QoS integrated control method comprising a. In claim 1,
If the preset jitter value is available for the WiMAX QoS control, applying the preset jitter value as the maximum jitter parameter
QoS integrated control method further comprising. In claim 1,
If the preset jitter value is not available for the WiMAX QoS control,
Receiving a plurality of jitter values respectively set according to the type of the service flow from a network provider, and
Selecting a jitter value suitable for the type of the service flow among the plurality of jitter values and applying the jitter value as the maximum jitter parameter
QoS integrated control method further comprising. In claim 1,
If the preset jitter value is not available for the WiMAX QoS control,
Receiving individual jitter values suitable for the type of service flow from a subscriber server and a mobility management entity; and
Applying the individual jitter value as the maximum jitter parameter
QoS integrated control method further comprising. 5. The method of claim 4,
Modifying the QoS parameter of the LTE network when the individual jitter value and the QoS class identifier (QCI) value of the QoS parameter of the LTE network are the same.
QoS integrated control method further comprising. In a wireless access unit that integrates and controls the quality of service (QoS) of WiMAX networks and long term evolution (LTE) networks,
IP flow receiver for receiving a service flow to be transmitted to the WiMAX terminal,
A QoS parameter converting unit converting QoS parameters of the LTE network into QoS parameters of the WiMAX network based on a result of analyzing the service flow;
A jitter controller for determining whether a preset jitter value can be used for WiMAX QoS control when the converted QoS parameter includes a max jitter parameter, and
QoS control unit for controlling the QoS for the WiMAX terminal according to the converted QoS parameter
Wireless access unit comprising a. The method of claim 6,
The QoS control unit,
And when the preset jitter value is available for the WiMAX QoS control, applying the preset jitter value as the maximum jitter parameter. The method of claim 6,
The jitter control unit,
Jitter input unit for receiving a plurality of jitter values set according to the type of the service flow from the network provider
Lt; / RTI >
And when the preset jitter value cannot be used for the WiMAX QoS control, the QoS control unit selects a jitter value suitable for the type of the service flow among the plurality of jitter values and applies the maximum jitter parameter as the maximum jitter parameter. The method of claim 6,
The jitter control unit,
Jitter receiver for receiving the individual jitter value suitable for the type of the service flow from the subscriber server and the mobility management entity
Lt; / RTI >
And the QoS control unit applies the individual jitter value as the maximum jitter parameter when the preset jitter value cannot be used for the WiMAX QoS control. The method of claim 9,
LTE QoS parameter correction for modifying the QoS parameter of the LTE network when the individual jitter value and the QoS class identifier (QCI) value of the QoS parameter of the LTE network are the same.
Wireless connection unit further comprising.

Images