WO2011079479A1 - Procédé et système de programmation de ressources - Google Patents

Procédé et système de programmation de ressources Download PDF

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Publication number
WO2011079479A1
WO2011079479A1 PCT/CN2010/000011 CN2010000011W WO2011079479A1 WO 2011079479 A1 WO2011079479 A1 WO 2011079479A1 CN 2010000011 W CN2010000011 W CN 2010000011W WO 2011079479 A1 WO2011079479 A1 WO 2011079479A1
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WO
WIPO (PCT)
Prior art keywords
macrocell
femtocell
current
resource
flexible
Prior art date
Application number
PCT/CN2010/000011
Other languages
English (en)
Chinese (zh)
Inventor
邱吉刚
杨峰
Original Assignee
上海贝尔股份有限公司
阿尔卡特朗讯
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.)
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Publication date
Application filed by 上海贝尔股份有限公司, 阿尔卡特朗讯 filed Critical 上海贝尔股份有限公司
Priority to CN201080046805XA priority Critical patent/CN102598771B/zh
Priority to PCT/CN2010/000011 priority patent/WO2011079479A1/fr
Publication of WO2011079479A1 publication Critical patent/WO2011079479A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/26—Resource reservation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
    • H04W8/24—Transfer of terminal data

Definitions

  • the embodiments of the present invention relate to the field of communications technologies, and in particular, to a resource scheduling method and system, which can avoid mutual interference between a Macrocell and a Femtocell by performing resource scheduling in a Macrocell embedded with one or more Femtocells. Background technique
  • Femtocell has some technical problems to be solved before it is put into commercial use, including network architecture considerations, self-configuration and interference management, especially how to effectively avoid interference in the process of using Femtocell technology.
  • network architecture considerations including network architecture considerations, self-configuration and interference management, especially how to effectively avoid interference in the process of using Femtocell technology.
  • interference management especially how to effectively avoid interference in the process of using Femtocell technology.
  • FIG. 1 shows the interference between Femtocell and Macrocell.
  • the Femtocell is embedded in the coverage area of the Macrocell, the UE101 is served by the Femtocell, and the UE102 is served by the Macrocell.
  • the Femtocell is connected to the user equipment UE101 and is connected to the mobile communication carrier's network using a broadband IP backhaul link.
  • the UE 102 served by the Macrocell is located near the Femtocell Access Point AP, which may be subject to downlink interference from the transmitter of the Femtocell AP, and which may form uplink interference to the receiver of the Femtocell AP.
  • the 3GPP and Femto Forum propose two solutions, dynamic power control (DPC) and switching mechanisms.
  • DPC dynamic power control
  • the system can adjust its transmit power to suit the radio environment. This method can only reduce the mutual interference between Femtocell and Macrocell to a certain extent, and cannot be completely avoided or eliminated.
  • a DPC used to handle one type of interference may cause another type of interference.
  • the Femtocell UE is being interfered by the Macrocell BS (base station)
  • the Femtocell AP can adaptively increase its transmit power to improve the quality of the radio link; however, due to the increased transmit power, the radio link may Interference is caused by nearby Macrocell UEs.
  • the Macrocell UE when the Macrocell UE enters the coverage area of the Femtocell and is thus interfered by the Femtocell AP, the Macrocell UE can switch to the Femtocell and transmit/receive the service packet through the air interface with the Femtocell AP. In this way, the UE becomes a UE served by the Femtocell, and its transmission/reception is controlled by the Femtocell AP, so that no interference is generated between the UE and the Femtocell AP.
  • the Femtocell AP when the UE moves outside the coverage area of the Femtocell, the Femtocell AP can switch back to the Macrocell and be served by the Macrocell.
  • the mutual interference between the Femtocell and the Macrocell cannot be completely avoided or eliminated.
  • the UE can avoid interference from the Femtocell AP by switching to the Femtocell, since the UE is no longer served by the Macrocell, it may be interfered by the Macrocell and vice versa.
  • the Femtocell access mode is usually non-open, considering the user's wishes and security.
  • CSG Closed Subscriber Group
  • a CSG Femtocell AP can only serve member users of the CSG. Therefore, an unauthorized non-member user or UE cannot switch to the CSG Femtocell and cannot obtain the service of the CSG Femtocell.
  • the mutual interference between the Femtocell and the Macrocell is still very serious.
  • This problem is the CSG Femtocell "Dead Zone" problem that needs to be resolved in 3GPP, as shown by the dotted line in Figure 1.
  • the present invention proposes a resource scheduling method and system capable of resource scheduling in a Macrocell in which one or more Femtocells are embedded.
  • the method and system adopt a resource reservation mechanism, and define a flexible reserved area for the Femtocell or Femtocell group, when served by Macrocell
  • the UE may send an interference indication message to the Cuell, and the Cuell may request the corresponding Femtocell to adjust its flexible reserved area according to the message, so as to be able to
  • the resource scheduling only the resources of the flexible reserved area are scheduled to the UE, and the UE can use the resources of the flexible reserved area to perform data transmission/reception operations, thereby avoiding interference with the Femtocell.
  • a resource scheduling method for resource scheduling in a Macrocell embedded with one or more Femtocells, the method comprising:
  • the user equipment served by the macrocell sends an interference indication message to the macrocell, where the interference indication message indicates that there is interference between the UE and one of the one or more Femtocells;
  • the macrocell receives the interference indication message, and determines, according to the interference indication message, the size and distribution of the flexible reservation area of the current Femtocell with interference between the UE, and the flexible reserved area indicates that the Femtocell embedded in the Macrocell is reserved for the coverage of entering the Femtocell.
  • the macrocell sends a resource reservation request message to the current Femtocell, where the request message includes information about the size and distribution of the elastic reserved area;
  • the current Femtocell receives the resource reservation request message, adjusts the flexible reservation area according to the request message, and sends a resource reservation response message to the Macrocell;
  • the macrocell receives the resource reservation response message, and schedules the resource of the flexible reserved area to the UE in the subsequent resource scheduling, so that the UE can use the resource of the flexible reserved area for data transmission.
  • the interference indication message is sent.
  • the one or more Femtocells are Femtocells of a closed user group CSG type
  • the UE served by the macrocell compares the CSG ID of the current Femtocell with the permission saved on the UE.
  • the UE served by the macrocell obtains the CSG ID of the current Femtocell by receiving the system broadcast information of the current Femtocell encapsulating the CSD ID of the current Femtocell.
  • the flexible reserved area is composed of resource blocks.
  • the multiple Femtocells are grouped in advance, and the Femtocells of the same group share the same flexible reserved area.
  • the Macrocell determines which group the current Femtocell belongs to to determine the size and distribution of the elastic reservation area for the group.
  • the multiple Femtocells are embedded in the Macrocell, before the Macrocell determines the size and distribution of the flexible reserved area, the multiple Femtocells are grouped, and the current Femtocell belongs to which group, to which the group belongs. Determine the size and distribution of the elastic reserved area,
  • the same group of Femtocells share the same flexible reserved area.
  • a plurality of Femtocells are grouped based on geographic location.
  • the current Femtocell in the subsequent resource scheduling, only allocates the resources of the inelastic reserved area to the UE served by the current Femtocell.
  • the size and distribution of the elastic reserved area is semi-static.
  • the elastic reserved area of the Femtocell remains unchanged for a predetermined period of time after being adjusted, but is periodically updated.
  • the Macrocell communicates with the current Femtocell via an IP backhaul link.
  • a resource scheduling system including:
  • One or more Femtocells embedded in the Macrocell are One or more Femtocells embedded in the Macrocell.
  • the UE served by Macrocell The UE served by Macrocell,
  • the user equipment UE served by the macrocell is configured to: send an interference indication message to the macrocell, where the interference indication message indicates that there is interference between the UE and one of the one or more Femtocells;
  • the macrocell is configured to: receive an interference indication message from the UE, and determine, according to the interference indication message, a size and a distribution of a flexible reservation area of the current Femtocell with interference between the UE, and the flexible reserved area indicates a Femtocell embedded in the Macrocell Reserving the resources of the UE served by the Macrocell; sending a resource reservation request message to the current Femtocell, the request message including the large flexible reservation area Small and distributed information; and, receiving a resource reservation response message from the current Femtocell, and scheduling the resource of the flexible reservation area to the UE in the subsequent resource scheduling, so that the UE can use the resource of the flexible reserved area to perform data transmission;
  • One or more FemtocellFemtocells are configured to: receive a resource reservation request message from the Macroell, adjust the flexible reservation area according to the request message, and send a resource reservation response message to the Macrocdl.
  • the present invention has the following advantages.
  • the resource reservation mechanism can solve the mutual interference problem between Femtocell systems, especially the dead zone problem.
  • the Femtocell packet mechanism is used to enhance the flexibility of resource scheduling for the UE and the adaptation to the dynamics of the data traffic load.
  • the interference avoidance mechanism of the present invention requires only limited coordination between the Macrocell and the Femtocell.
  • the size and distribution of the elastic reserved area is semi-static, that is, it remains unchanged for a certain length of time, and only needs to be updated periodically.
  • the signaling transmission for resource reservation is also relatively small.
  • Fig. 1 shows an environment in which the present invention can be applied, in which interference between Femtocell and Macrocell is schematically shown.
  • FIG. 2 shows an example of the relationship between the size of the FRZ and the number of unauthorized Macrocell UEs in the Femtocell coverage area.
  • Figure 3 shows a schematic diagram of a packet based resource reservation mechanism in the present invention.
  • FIG. 4 shows a resource scheduling process performed by a resource scheduling system according to an embodiment of the present invention in the application environment shown in FIG. 1. detailed description
  • the present invention adopts a resource reservation mechanism and defines a flexible reserved area.
  • the Verell can request the corresponding Femtocell to adjust its flexible reserved area according to the interference indication message sent by the UE it serves, so that it can only be used in subsequent resource scheduling.
  • the resources of the flexible reserved area are scheduled to the UE.
  • the Femtocell can only schedule resources of the inelastic reserved area to the UE it serves, and the Paintell also only schedules other resources to other UEs it serves.
  • the UE can use the resources of the flexible reserved area for data transmission/reception, etc., thereby avoiding mutual interference between the Pavell and the Femtocell.
  • the present invention adopts a resource reservation mechanism, and defines a flexible reservation zone (hereinafter referred to as FRZ) for Femtocell.
  • FRZ flexible reservation zone
  • the UE served by the Macrocell enters the coverage area of the Femtocell, especially when entering the "dead zone" of the CSG Femtocell, it cannot switch to the Femtocell, thereby causing mutual interference with the Femtocell.
  • such a UE is referred to as an unauthorized Macrocell UE.
  • the corresponding Femtocell can adjust its own FRZ, so that the Macrocell can only schedule the resources of the FRZ to the UE in the subsequent resource scheduling, and the UE can use the resources of the flexible reserved area to perform data. Operations such as sending/receiving, thereby avoiding interference with Femtocell.
  • the FRZ substantially indicates that the Femtocell embedded in the Macrocell is reserved for the resources of the UE served by the Macrocell into the coverage area of the Femtocell.
  • the FRZ may be composed of resource blocks such as subframes.
  • S FRZ (New) indicates the current FRZ size to be determined
  • f FRZ () indicates the function of adjusting the FRZ size
  • X MUE indicates the number of currently not authorized Macrocell UEs
  • X Traf ic indicates the average of each unauthorized Macrocell UE.
  • Data traffic X 0 indicates other factors
  • S FRZ (01d) indicates the previous FRZ size.
  • the greater the number of unauthorized Macrocell UEs located in the Femtocell coverage area the larger the FRZ size.
  • the FRZ does not include any resource blocks.
  • FRZ may include, for example, 2 resource blocks.
  • the FRZ includes 4 resource blocks, and at time 4, three unlicensed Macrocell UEs, UE10, UE20, UE30, Located in the Femtocell coverage area, the FRZ includes 6 resource blocks.
  • Figure 2 only shows an example of the relationship between the size of the FRZ and the number of unauthorized Macrocell UEs in the Femtocell coverage area, which may be linear or non-linear in practice; and, when considering various other factors When the FRZ size changes, it can be of any suitable type.
  • the size and distribution of the FRZ may be semi-static.
  • SP after the Femtocell adjusts its FRZ according to the resource reservation request message of the Macrocell, keeps the size and distribution of the FRZ unchanged for a predetermined period of time, but Update periodically. For example, it can be set to remain unchanged during subsequent frames, that is, to update in frames. Can be any natural number.
  • the Macrocell can schedule the FRZ resource block to the corresponding unauthorised Macrocell UE. ?
  • the value can be specific to the service provider and/or can be predetermined based on actual application needs.
  • the FRZ defined for a separate Femtocell is described above.
  • the inventor of the present application has noted that if a separate FRZ is assigned to each individual Femtocell, that is, the FRZ can only be scheduled to an unauthorized Macrocell UE that enters the coverage area of the Femtocell, it may cause a large number of resource blocks to be fixed to certain Macrocell UE. In this case, it is difficult for the Macrocell to perform resource scheduling for each UE it serves, which will seriously reduce the flexibility of resource scheduling, thereby seriously reducing the multi-user diversity gain obtained through resource scheduling.
  • the data traffic load is very dynamic, the resource blocks required by a Macrocell UE may vary over time.
  • the present invention proposes a packet-based resource reservation mechanism.
  • a plurality of Femtocells embedded in a Macrocell are grouped. They can be grouped according to the geographic location of the Femtocell, whether there are unauthorized Macrocell UEs in the Femtocell coverage area, or other metric information.
  • the packet may be pre-specified or may be dynamically performed by Macrocell during the execution of resource scheduling.
  • Figure 3 shows a schematic diagram of a packet based resource reservation mechanism. As shown in FIG. 3, there is no Macrocell UE in the vicinity of Femtocell 2, and Bay ij Femtocell 2 may not be classified into any group, that is, has no FRZ.
  • the other Femtocells are divided into three groups: Group 1 includes Femtocell 1 and Femtocell 3, which share FRZ1, and thus unauthorized Macrocell UE1 - UE4 entering the coverage area of Femtocell 1 or Femtocell 3 can share FRZ1; Group 2 only includes Femtocell 4, Thus, unauthorized Macrocell UE5 and UE6 entering the coverage area of Femtocell 4 share FRZ2; Group 3 includes Femtocell 5 and Femtocell 6, which share FRZ3, so unauthorized Macrocell UE7-UE9 entering the coverage area of Femtocell 5 or Femtocell 6 shares FRZ3.
  • Group 1 includes Femtocell 1 and Femtocell 3, which share FRZ1, and thus unauthorized Macrocell UE1 - UE4 entering the coverage area of Femtocell 1 or Femtocell 3 can share FRZ1; Group 2 only includes Femtocell 4, Thus, unauthorized Macrocell UE5 and UE6 entering the coverage area of Femto
  • the macrocell can determine the FRZ of each Femtocell group according to the condition of each Femtocell group, and can perform scheduling of the FRZ resource block among all the unauthorized Macrocell UEs entering a Femtocell group. For example, referring to FIG. 3, for group 1 composed of Femtocell 1 and Femtocell 3, when a new unauthorized Macrocell UE enters Femtocell 1 and issues interference indication information, Macrocell may first determine which group Femtocell 1 belongs to, and according to the current radio environment.
  • the number of Macrocell UEs currently in the coverage area of Femtocell 1 and Femtocell 3, the average data traffic of each unauthorized Macrocell UE, the previous FRZ size of Group 1, or/and other factors determine the current size of FRZ1. Then, after the FRZ1 is adjusted by the Femtocell 1, the FRZ 1 resource block is scheduled between the new unlicensed Macrocell UE and the existing unauthorized Macrocell UE 1 - UE4, so that the flexibility and the resource scheduling for the UE can be enhanced. Adaptation of the dynamics of data traffic load.
  • a wireless communication application environment of 3GPP LTE is employed. It should be noted that embodiments of the present invention are not limited to these applications, but may be Suitable for more related communication application environments.
  • those skilled in the art may think that the operation of the Macrocell and the Femtocell in the resource scheduling process according to the embodiment of the present invention may be implemented by a Macrocell base station or an enhanced base station, a Femtocell AP, respectively, or may be any according to the principles of the present invention.
  • “Macrocell” is equivalent to "Macrocell base station or enhanced base station”
  • “Femtocell” is equivalent to "Femtocell AP”.
  • the Femtocell is embedded in the coverage area of the Macrocell, the UE101 is served by the Femtocell, and the UE102 is served by the Macrocell.
  • the UE 102 is located near the Femtocell AP, ⁇ P, enters the Femtocell coverage area, and interferes with the Femtocell AP.
  • the Femtocell may be of the CSG type, and the UE 102 is an unauthorized Macrocell UE that cannot be handed over to the Femtocell. It will be understood that although only a single Femtocell and a single unlicensed Macrocell UE are shown in Figure 1, this is for illustrative purposes. According to the embodiment of the present invention, multiple Femtocells may be embedded in the coverage area of the Macrocell, and multiple unlicensed Macrocell UEs may exist in the coverage area of each Femtocell, as shown in FIG.
  • FIG. 4 shows a resource scheduling process performed by a resource scheduling system according to an embodiment of the present invention in the above-described application environment as an example.
  • the details and functions that are not necessary for the present invention are omitted in the description to avoid confusion of the understanding of the present invention.
  • the resource scheduling system in the embodiment of the present invention may include a Macrocell, one or more Femtocells embedded in the Macrocell, and UEs served by the Macrocell. 1 and 4, as an example, the resource scheduling system may include a Macrocell, a Femtocell, and a UE 102. It should be noted that the UE may also include UEs served by the Femtocell, and the number of Femtocells and UEs is not limited to the example number shown in the figure.
  • step S400 the UE 102 sends an interference indication message to the serving macrocell, the interference indication message indicating that there is interference between the UE and the Femtocell.
  • the UE 102 may send interference indication information in the following cases.
  • the UE 102 can detect whether there is interference between the Femtocell through the common pilot channel CPICH measurement or other commonly used measurements. If there is interference, the UE 102 can determine whether the cell reselection/handover can be performed. , to switch to Femtocell, so that the Femtocell service, to avoid causing / suffering interference. For example, if the Femtocell is a CSG type Femtocell, the UE 102 may receive from the Femtocell's broadcast channel after receiving it. The broadcast system information of the Femtocell AP, in which the CSG ID of the Femtocell is encapsulated.
  • the UE 102 can determine whether it is authorized to switch to the Femtocell by comparing the received CSG ID with its own "Allow CSG List" stored.
  • the "Allow CSG List” may be stored in the Subscriber Identity Module SIM or Global Subscriber Identity Module USIM of the UE 102. If the CSG ID is in the "Allow CSG List", it indicates that the UE 102 is authorized to switch to the Femtocell, so that the UE can perform a normal cell reselection/handover process to switch to the Femtocell, thereby serving by the Femtocell, avoiding causing / Suffering from interference.
  • the plurality of Femtocells may be grouped according to factors such as a geographical location, and the same group of Femtocells share the same FRZ.
  • the Macrocell determines which group the current Femtocell belongs to to determine the size and distribution of the flexible reserved area for the group, ie, considering, for example, the current radio environment, the group is not authorized.
  • the number of Macrocell UEs, the average data traffic of each unauthorized Macrocell UE, the size of the original FRZ of the group, and other related factors determine the size of the FRZ.
  • the Femtocell may not be pre-grouped, but the Macrocell groups the Femtocells in real time before the Macrocell determines the size and distribution of the flexible reserved area, and determines which group the current Femtocell belongs to. This group determines the size and distribution of the elastic reserved area.
  • step S404 the Macrocell sends a resource reservation request message to the current Femtocell, the request message including information about the size and distribution of the FRZ.
  • the Macrocell can pass The IP backhaul link sends a resource reservation request message to the Femtocell.
  • the current Femtocdl receives the resource reservation request message, adjusts its FRZ according to the request message, and sends a resource reservation response message to the macrocell.
  • the current Femtocell may send a resource reservation response message to the Macrocell through the IP backhaul link.
  • the FRZ resource block is scheduled to the UE 102 to enable the UE 102 to use the FRZ resource block for data transmission.
  • the FRZ resource block can be scheduled only to the UE 102 during subsequent frames.
  • Femtocell allocates only non-FRZ resource blocks to UE101 it serves, and does not occupy FRZ resource blocks.
  • Macrocell only allocates other resource blocks to other UEs it serves. In this way, the UE 102' performs data transmission and reception according to the resource scheduling result during the FRZ, thereby avoiding interference with the Femtocell.
  • FRZ can be dynamically reserved through limited coordination between Femtocell-Macro.
  • unsolicited UE transmission and reception operations will not cause interference to Femtocell and will not be interfered by Femtocell. In this way, even if the UE does not have access to the Femtocell, mutual interference with the Femtocell can be avoided, thereby enhancing system performance and ensuring quality of service.
  • some embodiments also include a machine readable or computer readable program storage device (eg, a digital data storage medium) and encoding machine executable or computer executable program instructions, wherein the instructions perform some of the above methods or All steps.
  • the program storage device can be a digital memory, a magnetic storage medium (such as a magnetic disk and magnetic tape), a hardware or an optically readable digital data storage medium.
  • Embodiments also include a programming computer that performs the steps of the above method.

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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

L'invention concerne un procédé et un système de programmation de ressources. Le procédé consiste en les étapes suivantes : un équipement utilisateur (UE) desservi par une macrocellule envoie un message d'indication d'interférences à la macrocellule ; la macrocellule reçoit le message d'indication d'interférences et détermine le groupe de la femtocellule courante ainsi que la taille et la distribution de la zone de réservation flexible correspondante, les interférences se produisant entre l'UE et la femtocellule courante ; la macrocellule envoie un message de demande de réservation de ressources à la femtocellule courante, le message de demande comprenant les informations sur la taille et la distribution de la zone de réservation flexible ; la femtocellule courante reçoit le message de demande de réservation de ressources, ajuste la zone de réservation flexible en fonction du message de demande et envoie un message de réponse de réservation de ressources à la macrocellule ; et la macrocellule reçoit le message de réponse de réservation de ressources et programme les ressources de la zone de réservation flexible pour l'UE pendant la programmation de ressources suivante. Grâce au procédé et au système de la présente invention, la zone de réservation flexible (FRZ) peut être réservée dynamiquement par la coordination limitée entre la femtocellule et la macrocellule. De cette manière, même lorsqu'un UE n'est pas autorisé à accéder à une femtocellule, les interférences entre l'UE et la femtocellule peuvent être évitées, ce qui permet d'améliorer les performances du système et de garantir la qualité du service.
PCT/CN2010/000011 2010-01-04 2010-01-04 Procédé et système de programmation de ressources WO2011079479A1 (fr)

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CN201080046805XA CN102598771B (zh) 2010-01-04 2010-01-04 资源调度方法及系统
PCT/CN2010/000011 WO2011079479A1 (fr) 2010-01-04 2010-01-04 Procédé et système de programmation de ressources

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CN101494871A (zh) * 2008-01-24 2009-07-29 中兴通讯股份有限公司 微小区建设的规划方法
CN101574000A (zh) * 2006-12-15 2009-11-04 朗讯科技公司 在宏小区内的微小区通信的上行链路功率控制

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CN101574000A (zh) * 2006-12-15 2009-11-04 朗讯科技公司 在宏小区内的微小区通信的上行链路功率控制
US20090040972A1 (en) * 2007-08-10 2009-02-12 Julius Robson Radio Resource Allocation for Cellular Wireless Networks
CN101494871A (zh) * 2008-01-24 2009-07-29 中兴通讯股份有限公司 微小区建设的规划方法

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