WO2012171178A1 - Procédé, dispositif et système de garantie de qos - Google Patents

Procédé, dispositif et système de garantie de qos Download PDF

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Publication number
WO2012171178A1
WO2012171178A1 PCT/CN2011/075740 CN2011075740W WO2012171178A1 WO 2012171178 A1 WO2012171178 A1 WO 2012171178A1 CN 2011075740 W CN2011075740 W CN 2011075740W WO 2012171178 A1 WO2012171178 A1 WO 2012171178A1
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WO
WIPO (PCT)
Prior art keywords
user
fach
gbr
base station
gbr information
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Application number
PCT/CN2011/075740
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English (en)
Chinese (zh)
Inventor
徐卫中
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201180000757.5A priority Critical patent/CN102972065B/zh
Priority to PCT/CN2011/075740 priority patent/WO2012171178A1/fr
Publication of WO2012171178A1 publication Critical patent/WO2012171178A1/fr

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W28/00Network traffic management; Network resource management
    • H04W28/16Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/24Negotiating SLA [Service Level Agreement]; Negotiating QoS [Quality of Service]

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to an E-FACH (E-Forward Access) Channel, enhanced forward access channel) A method, apparatus, and system for performing QoS (Quality of Service) control.
  • E-FACH E-Forward Access
  • QoS Quality of Service
  • E-FACH E-Forward Access Channel
  • E-FACH UE User Equipment, user equipment
  • HS-DSCH High Speed-Downlink Shared Channel, high-speed physical downlink shared channel
  • E-FACH supports CELL_FACH (CELL-Forward Access Channel, cell forward access channel) CCCH (Common Control Channel), DCCH (Dedicated Control) Channel, dedicated control channel), DTCH (Dedicated Traffic Channel), BCCH (Broadcast Control) Channel, broadcast control channel) mapping on the HS-DSCH.
  • CCCH Common Control Channel
  • DCCH Dedicated Control
  • DTCH Dedicated Traffic Channel
  • BCCH Broadcast Control
  • Embodiments of the present invention provide a method, apparatus, and system for assuring quality of service to enable efficient QoS control for E-FACH users.
  • a method of ensuring quality of service including:
  • the base station control device sets an enhanced bit rate GBR information related to the enhanced forward access channel E-FACH user;
  • the base station control device sends a data frame carrying the guaranteed bit rate GBR information related to the E-FACH user to the base station.
  • a method of ensuring quality of service including:
  • the base station acquires the GBR information carried in the data frame, and performs quality of service QoS control on the E-FACH user according to the GBR information.
  • a base station control device includes:
  • a guaranteed bit rate GBR information setting module configured to set GBR information related to an enhanced forward access channel E-FACH user
  • a data frame processing module configured to send, to the base station, a data frame that carries the GBR information related to the E-FACH user.
  • a base station comprising:
  • a data frame receiving module configured to receive a data frame that is sent by the base station control device and carries the guaranteed bit rate GBR information related to the enhanced forward access channel E-FACH user;
  • a quality of service QoS control module configured to acquire GBR information related to the E-FACH user carried in a data frame received by the data frame receiving module, and perform QoS control on the E-FACH user according to the GBR information .
  • a system for guaranteeing quality of service includes the base station control device and the base station.
  • the embodiment of the present invention sends a GBR (Guaranteed Bit) related to an E-FACH user by using a base station control device.
  • GBR Guard Bit
  • Rate guaranteed bit rate
  • the data frame of the information is given to the base station, and the base station can perform effective QoS control on the E-FACH user according to the GBR information, thereby improving the satisfaction of the E-FACH user.
  • Embodiment 1 is a process flowchart of a method for guaranteeing quality of service according to Embodiment 1 of the present invention
  • FIG. 2 is a flowchart of a specific process of a method for performing QoS control on an E-FACH user according to Embodiment 2 of the present invention
  • FIG. 3 is a schematic diagram of an HS-DSCH Frame protocol with a GBR field added according to Embodiment 2 of the present invention; Schematic diagram of a type 2 frame;
  • FIG. 5 is a structural diagram of a base station control device according to Embodiment 4 of the present invention.
  • FIG. 6 is a structural diagram of a NodeB according to Embodiment 4 of the present invention.
  • FIG. 7 is a structural diagram of a system for guaranteeing quality of service according to Embodiment 4 of the present invention.
  • This embodiment provides a method for guaranteeing the quality of service.
  • the specific processing flow is as shown in FIG. 1 and includes the following processing steps:
  • Step 11 The base station receives a data frame that is sent by the base station control device and carries the GBR information related to the E-FACH user.
  • WCDMA Wideband Code Division Multiple
  • RNC Radio Network Controller, radio network controller
  • NodeB Radio Network Controller
  • the above-mentioned E-FACH user-related GBR information may include: GBR information for a single E-FACH user, or GBR information for a single service queue, one of which corresponds to a service type of the E-FACH user.
  • the above data frame may include: HS-DSCH DATA FRAME TYPE 2 (High-speed physical downlink shared channel data frame type 2), the HS-DSCH DATA FRAME TYPE A GBR field is added to the data frame, and the GBR information related to the E-FACH user is configured in the GBR field.
  • Step 12 The base station acquires the GBR information carried in the data frame, and performs QoS control on the E-FACH user according to the GBR information.
  • the NodeB guarantees the resource corresponding to the GBR information corresponding to the single E-FACH user when the resource is allocated according to the GBR information.
  • the NodeB guarantees resources corresponding to the GBR information corresponding to the single service queue when the resources are allocated according to the GBR information.
  • the base station control device sends a data frame carrying the GBR information related to the E-FACH user to the base station, so that the base station can perform effective QoS control on the E-FACH user according to the GBR information.
  • this embodiment provides a method for performing QoS control on an E-FACH user.
  • the specific processing flow is as shown in FIG. 2, and includes the following processing steps:
  • Step 21 UE of the E-FACH user (User In the process of establishing a link connection with the network side, the equipment, the user equipment sends signaling of the user information carrying the E-FACH user to the network side.
  • the user information may include a user identifier, and may further include at least one of a user level, a service type, and a service attribute.
  • the foregoing user level may be: a VIP user, a normal user, a high-capacity user, a low-capacity user, and the like;
  • the foregoing service type may include: a payment service, a browsing web service, or a download service; for the download service, the foregoing service attribute may be Including: download rate, upload rate, transmission delay, and so on.
  • Step 22 The RNC on the network side acquires user information of the E-FACH user, and sets GBR information for a single E-FACH user.
  • the RNC may set GBR information for a single E-FACH user according to at least one of a user level, a service type, a service attribute, and the like included in the user information of the E-FACH user.
  • the RNC After acquiring the user information of multiple E-FACH users, the RNC can separately set the GBR information for each E-FACH user. In addition, the RNC may not set GBR information for unimportant E-FACH users.
  • Step 23 The RNC sends a data frame carrying the GBR information for the single E-FACH user to the NodeB.
  • the RNC sends the GBR information for the single E-FACH user to the NodeB through the data frame.
  • the foregoing data frame may be an RNC through an IUB (Interface between the NodeB and The RNC, the interface between the NodeB and the RNC) transmits the HS-DSCH Frame protocol type 2 frame to the NodeB.
  • IUB Interface between the NodeB and The RNC, the interface between the NodeB and the RNC
  • the GBR field is added to the Frame protocol type2 frame.
  • an HS-DSCH Frame protocol with an added GBR field The schematic diagram of the type2 frame is shown in Figure 3, in the HS-DSCH Frame protocol in Figure 3.
  • the type2 frame is composed of a header (header) and a load (payload), wherein the spare field in the Payload represents an idle field, and the added GBR field in the Payload can be regarded as an extension of the spare field and carried in the above GBR field.
  • the user identifier of the E-FACH user is also carried in the foregoing data frame.
  • Step 24 The NodeB acquires the foregoing user identifier and GBR information for a single E-FACH user carried in the data frame, and performs QoS control on the E-FACH user according to the GBR information.
  • the NodeB guarantees resources corresponding to the GBR information corresponding to the single E-FACH user when the resource is allocated according to the GBR information.
  • the NodeB can allocate a bandwidth rate resource of 100M, and the NodeB accesses the E-FACH user 1, the E-FACH user 2, and some other E-FACH users.
  • the GBR information for the E-FACH user 1 is 50M, and the GBR information for the E-FACH user 2 is 30M.
  • Other E-FACH users do not have corresponding GBR information.
  • the NodeB when allocating the bandwidth rate resource, the NodeB first guarantees the bandwidth rate resource corresponding to the GBR information of the E-FACH user 1 and the E-FACH user 2, that is, allocates 50M to the E-FACH user 1, and allocates the E-FACH user 2 to the E-FACH user 2. 30M, the remaining 20M is reassigned to other E-FACH users.
  • the embodiment sends a data frame carrying the GBR information for a single E-FACH user to the NodeB through the RNC, and the NodeB can refer to the GBR information to different E-FACH users.
  • the resources are allocated to ensure the resources of the EFACH user service corresponding to the GBR information. Therefore, the NodeB provides differentiated guarantee for different EFACH users, implements effective QoS control for E-FACH users, and improves the satisfaction of E-FACH users.
  • this embodiment provides a method for performing QoS control on an E-FACH user.
  • the specific processing flow is as shown in FIG. 4, and includes the following processing steps:
  • Step 41 The UE of the E-FACH user sends signaling of the user information of the E-FACH user to the network side in the process of establishing a link connection with the network side, where the user information may include a user identifier, optionally
  • the method may further include: at least one of a user level, a service type, a service attribute, and the like.
  • the foregoing user level may be: a VIP user, a normal user, or the like;
  • the foregoing service type may include: a payment service, a browsing web service, or a download service, etc.;
  • the foregoing service attributes may include: a download rate, a server address , the address of the client, and so on.
  • Step 42 The RNC on the network side acquires user information of the E-FACH user, and sets GBR information corresponding to a single service queue.
  • the RNC can also obtain information about various service queues maintained by the network side.
  • the foregoing service queue can be in the MAC (Media Access). Control, Media Access Control)
  • One of the above service queues corresponds to a service type.
  • the download service corresponds to one download queue
  • the payment service corresponds to one payment queue.
  • a service queue can include the same service of multiple E-FACH users.
  • the RNC can obtain the service queue information to which the various services corresponding to the E-FACH user belong according to the service type information included in the user information of the E-FACH user.
  • the RNC sets GBR information corresponding to a single service queue according to at least one of the user information of the E-FACH user and the service type and service attribute corresponding to the various service queues.
  • the RNC may not set GBR information for unimportant traffic queues.
  • Step 43 The RNC sends, to the NodeB, a data frame that carries the GBR information for the single service queue.
  • the NodeB Since the E-FACH user does not have a dedicated dedicated channel establishment process, the NodeB cannot obtain the GBR information of the E-FACH user-related service queue through signaling. Therefore, in the embodiment of the present invention, the RNC sends the GBR information for a single service queue to the NodeB through the data frame.
  • the foregoing data frame may be an HS-DSCH Frame protocol sent by the RNC to the NodeB through the IUB interface.
  • Type2 frame in HS-DSCH Frame protocol The header field in the Header and Payload of the type2 frame represents the idle field.
  • the GBR field added in the Payload can be regarded as an extension of the spare field, and the GBR information for the single service queue is configured in the GBR field.
  • the indication, the scheduling priority indication field may also carry the identification information of the service queue.
  • Step 44 The NodeB guarantees resources corresponding to the GBR information of the single service queue when the resources are allocated according to the GBR information.
  • the NodeB after receiving the data frame, the NodeB obtains the GBR information of the single service queue and the identification information of the service queue carried in the SPI field, which is carried in the GBR field of the data frame, and obtains the identifier information corresponding to the service queue. GBR information for a certain business queue.
  • the NodeB can obtain the GBR information corresponding to each of the multiple service queues by receiving the multiple data frames sent by the RNC.
  • the RNC performs QoS control on the corresponding service queue according to the GBR information corresponding to the single service queue, and guarantees the resource corresponding to the GBR information corresponding to the single service queue when the resource is allocated.
  • the bandwidth rate resource allocated by the NodeB is 100M
  • the service queue 1, the service queue 2, and some other service queues are maintained on the network side.
  • the GBR information for service queue 1 is 50M
  • the GBR information for service queue 2 is 30M.
  • Other service queues do not have corresponding GBR information.
  • the NodeB first guarantees the bandwidth rate resource corresponding to the GBR information of the service queue 1 and the service queue 2, that is, allocates 50M to the service queue 1, allocates 30M to the service queue 2, and allocates the remaining 20M. Assigned to other business queues.
  • the RNC sends a data frame carrying GBR information for a single service queue to the NodeB
  • the NodeB can refer to the GBR information to different types of E-FACH users.
  • the service allocates resources to guarantee the resources of the service queue corresponding to the GBR information. Therefore, the NodeB provides differentiated guarantees for different types of services of the E-FACH users, implements effective QoS control for the E-FACH users, and improves the satisfaction of the E-FACH users.
  • This embodiment provides a base station control device, and its specific structure is as shown in FIG. 5, and includes the following modules:
  • the GBR information setting module 51 is configured to set GBR information related to the E-FACH user
  • the data frame processing module 52 is configured to send, to the base station NodeB, a data frame carrying GBR information related to the E-FACH user.
  • the GBR information setting module 51 may include:
  • the user information acquiring unit 511 is configured to acquire user information of the E-FACH user sent by the user equipment of the E-FACH user to the network side in the process of establishing a link connection with the network side;
  • the setting processing unit 512 is configured to set the GBR information related to the E-FACH user according to the user information of the E-FACH user acquired by the user information acquiring module, where the GBR information related to the E-FACH user includes : GBR information for a single E-FACH user and/or GBR information for a single service queue, one of the service queues corresponding to a type of service of the E-FACH user.
  • GBR information may not be set for an unimportant E-FACH user or service queue.
  • the data frame processing module 52 may include:
  • the GBR information configuration unit 521 is configured to share the channel data frame type HS-DSCH DATA FRAME in the high speed physical downlink Configuring the GBR information related to the E-FACH user in the newly added GBR field in the TYPE 2 frame;
  • the sending processing unit 522 is configured to send, to the NodeB, the HS-DSCH DATA that carries the GBR information related to the E-FACH user set by the GBR information setting module. FRAME TYPE 2 frames.
  • the above base station control device is an RNC. It can be understood that in other systems, the base station control device may have different names.
  • This embodiment also provides a base station, and its specific structure is as shown in FIG. 6, and includes the following modules:
  • the data frame receiving module 61 is configured to receive, by the base station control device, a data frame that carries the guaranteed bit rate GBR information related to the enhanced forward access channel E-FACH user;
  • the QoS control module 62 is configured to acquire the GBR information related to the E-FACH user carried in the data frame received by the data frame receiving module, and perform QoS control on the E-FACH user according to the GBR information.
  • the QoS control module 62 may include at least one of the first control processing unit 621 and the second control processing unit 622:
  • the first control processing unit 621 is configured to: when the GBR information related to the E-FACH user is GBR information for a single E-FACH user, according to the GBR information for a single E-FACH user, when the resource is allocated a resource corresponding to the GBR information corresponding to the single E-FACH user;
  • the second control processing unit 622 is configured to: when the GBR information related to the E-FACH user is GBR information for a single service queue, guarantee the single service when allocating resources according to the GBR information for a single service queue.
  • the above base station is a NodeB. It can be understood that in other systems, the base stations may have different titles.
  • This embodiment also provides a system for guaranteeing the quality of service.
  • the specific structure is as shown in FIG. 7, and includes:
  • the base station control device 71 is configured to send a data frame carrying the GBR information related to the E-FACH user to the NodeB;
  • the base station 72 is configured to acquire the GBR information carried in the data frame sent by the RNC 51, and perform QoS control on the E-FACH user according to the GBR information.
  • the specific structure of the foregoing base station control device is as shown in FIG. 5, and the specific structure of the foregoing NodeB is as shown in FIG. 6.
  • the specific processing procedure of the foregoing base station control device and the NodeB may refer to the foregoing descriptions for FIG. 5 and FIG. Let me repeat.
  • the base station control device is an RNC, and the base station is a NodeB. It can be understood that in other systems, the base station control device and the base station may have different names.
  • the storage medium may be a magnetic disk, an optical disk, or a read-only storage memory (Read-Only) Memory, ROM) or Random Access Memory (RAM).
  • the method, the device, and the system provided by the embodiment of the present invention send a data frame carrying the GBR information related to the E-FACH user to the base station, and the base station can refer to the GBR information to the single E-FACH user.
  • the service queue corresponding to the different types of services of the E-FACH user allocates resources, and the resources of the single EFACH user or the single service queue corresponding to the GBR information are guaranteed. Therefore, the base station provides differentiated guarantees for different types of services of different EFACH users or EFACH users, implements QoS control for E-FACH users, and improves the satisfaction of E-FACH users.

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

Abstract

Les modes de réalisation de la présente invention concernent un procédé, un dispositif et un système pour garantir une qualité de service (QoS). Dans le procédé, principalement: un équipement de commande de station de base détermine des informations de débit binaire garanti (GBR) associées à un utilisateur de canal E-FACH (E-Forward Access Channel) ; ledit équipement de commande de station de base envoie une trame de données transportant lesdites informations de GBR associées à l'utilisateur de l'E-FACH à une station de base. En utilisant les modes de réalisation de la présente invention, la station de base peut mettre en oeuvre un contrôle de QoS efficace pour l'utilisateur de l'E-FACH conformément auxdites informations de GBR, et la satisfaction de l'utilisateur de l'E-FACH est améliorée.
PCT/CN2011/075740 2011-06-14 2011-06-14 Procédé, dispositif et système de garantie de qos WO2012171178A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201180000757.5A CN102972065B (zh) 2011-06-14 2011-06-14 保证服务质量的方法、装置和系统
PCT/CN2011/075740 WO2012171178A1 (fr) 2011-06-14 2011-06-14 Procédé, dispositif et système de garantie de qos

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Application Number Priority Date Filing Date Title
PCT/CN2011/075740 WO2012171178A1 (fr) 2011-06-14 2011-06-14 Procédé, dispositif et système de garantie de qos

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104244422A (zh) * 2014-09-23 2014-12-24 中国联合网络通信集团有限公司 资源分配方法与装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101001454A (zh) * 2006-06-22 2007-07-18 华为技术有限公司 一种上行增强链路中用户调度方法及系统
CN101094166A (zh) * 2006-06-21 2007-12-26 中兴通讯股份有限公司 一种为多载波高速下行分组接入分配无线资源的方法
CN101615931A (zh) * 2008-06-24 2009-12-30 华为技术有限公司 一种无线通信系统中的功率控制方法、装置及系统

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101094166A (zh) * 2006-06-21 2007-12-26 中兴通讯股份有限公司 一种为多载波高速下行分组接入分配无线资源的方法
CN101001454A (zh) * 2006-06-22 2007-07-18 华为技术有限公司 一种上行增强链路中用户调度方法及系统
CN101615931A (zh) * 2008-06-24 2009-12-30 华为技术有限公司 一种无线通信系统中的功率控制方法、装置及系统

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104244422A (zh) * 2014-09-23 2014-12-24 中国联合网络通信集团有限公司 资源分配方法与装置

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