WO2011079479A1

WO2011079479A1 - Method and system for resource scheduling

Info

Publication number: WO2011079479A1
Application number: PCT/CN2010/000011
Authority: WO
Inventors: 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: 2010-01-04
Filing date: 2010-01-04
Publication date: 2011-07-07
Also published as: CN102598771B; CN102598771A

Abstract

A method and a system for resource scheduling are provided in the present invention. The method includes: a User Equipment (UE) serviced by a macrocell sends an interference indication message to the macrocell; the macrocell receives the interference indication message and determines the group of the current femtocell and the size and the distribution of the corresponding flexible reservation zone, wherein the interference exists between the UE and the current femtocell; the macrocell sends a resource reservation request message to the current femtocell, the request message includes the information of the size and the distribution of the flexible reservation zone; the current femtocell receives the resource reservation request message, adjusts the flexible reservation zone according to the request message, and sends a resource reservation response message to the macrocell; and the macrocell receives the resource reservation response message and schedules the resources of the fexible reservation zone to the UE during the following resource scheduling. With the method and the system of the present invention, the Flexible Reservation Zone (FRZ) is able to be reserved dynamically by the limited coordination between the femtocell and the macrocell. In this way, even if a UE has no right to access a femtocell, the interference between the UE and the femtocell is able to be avoided, therefore the system performance is enhanced, and the quality of service is ensured.

Description

Resource scheduling method and system

Technical field

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

In current and future communication systems, such as LTE/LTE-A, coverage areas and "3dB attenuation" issues are always challenges for communication equipment vendors, communication service providers and users. In response to these problems, various solutions have been proposed, including relays, directional beams, repeaters, Femtocells, and other technologies. Femtocell technology can improve the coverage area by adopting cell splitting or embedded cell technology. And system capacity, which has attracted more and more attention from operators, service providers and research and development personnel of communication systems.

As an emerging technology, 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. One of the technical issues to be solved.

The interference problem that occurs when using Femtocell technology is described below with reference to Figure 1. Figure 1 shows the interference between Femtocell and Macrocell. As shown in Figure 1, 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. Through the same air interface, 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. These disturbances can reduce system capacity and affect the normal use of user equipment.

In response to the aforementioned interference problems, many research institutions and standardization organizations, including 802.16 and 3GPP, are working on research and development of corresponding resolution mechanisms.

The 3GPP and Femto Forum propose two solutions, dynamic power control (DPC) and switching mechanisms. According to the DPC mechanism, 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. In addition, it should be noted that when using the DPC mechanism, a DPC used to handle one type of interference may cause another type of interference. For example, when 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.

According to the handover mechanism, 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. Correspondingly, 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.

In the above switching mechanism, the mutual interference between the Femtocell and the Macrocell cannot be completely avoided or eliminated. Although 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.

In addition, the Femtocell access mode is usually non-open, considering the user's wishes and security. For example, according to the Closed Subscriber Group (CSG) mode proposed by the 3GPP, 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. In this case, when an unauthorized user is in the vicinity of the Femtocell AP or in the Femtocell coverage area, 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.

Therefore, there is a need for a method for femtocell deployment that avoids mutual interference between Femtocell and Macrocell. Summary of the invention

In view of the above problems, 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 When the UE enters the coverage area of the Femtocell and detects mutual interference but cannot switch to the Femtocell, the UE may send an interference indication message to the Marocell, and the Marocell may request the corresponding Femtocell to adjust its flexible reserved area according to the message, so as to be able to In 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.

According to an aspect of the present invention, a resource scheduling method is provided 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 resources of the UE served by the Macrocell;

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.

According to the embodiment of the present invention, when the UE served by the macrocell enters the coverage area of the current Femtocell, if it detects that there is interference with the current Femtocell and determines that the current Femtocell cannot be switched, the interference indication message is sent.

According to an embodiment of the present invention, 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.

If the CSG ID of the current Femtocell is not in the allowed CSG list, it is judged that the current Femtocell cannot be switched.

According to the embodiment of the present invention, 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.

According to an embodiment of the present invention, the Macrocell determines the current according to one or more of the following factors: Size of the elastic reserved area of the Femtocell: current radio environment; the number of UEs located in the coverage area of the current Femtocell but served by the Macrocell; the average data traffic of the UEs served by the Macrocell; the previous flexible reservation of the current Femtocell Area size.

According to an embodiment of the invention, the flexible reserved area is composed of resource blocks.

According to the embodiment of the present invention, if multiple Femtocells are embedded in the Macrocell, the multiple Femtocells are grouped in advance, and the Femtocells of the same group share the same flexible reserved area.

Before the macrocell determines the size and distribution of the elastic reservation 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.

According to the embodiment of the present invention, if 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,

Among them, the same group of Femtocells share the same flexible reserved area.

According to an embodiment of the invention, a plurality of Femtocells are grouped based on geographic location.

According to the embodiment of the present invention, in the subsequent resource scheduling, the current Femtocell only allocates the resources of the inelastic reserved area to the UE served by the current Femtocell.

According to an embodiment of the invention, 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.

According to an embodiment of the invention, the Macrocell communicates with the current Femtocell via an IP backhaul link.

According to another aspect of the present invention, a resource scheduling system is provided, including:

Macrocell,

One or more Femtocells embedded in the Macrocell, and

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. First, interference between Femtocell systems can reduce system capacity and compromise service quality. The resource reservation mechanism can solve the mutual interference problem between Femtocell systems, especially the dead zone problem. Second, a new flexible reserved area is defined, which may include resource blocks such as subframes. The size of the flexible reserved area is determined by Macrocdl based on a number of factors and is semi-static, which is suitable for a variety of factors such as the pre-radio environment. Third, 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. If a fixed private elastic reserved area is specified for each Femtocell, a large number of resource blocks may be fixed to the Macrocell UE that enters the Femtocell coverage area. In this case, it is difficult to perform UE resource scheduling, and the multi-user diversity gain obtained by scheduling is also seriously reduced. With the grouping mechanism, multiple Femtocells in the same group can share the same flexible reserved area, so that the flexible reserved area can be shared among all UEs entering the coverage area of the group of Femtocells, so that the flexible reserved area can be More scheduling between Macrocell UEs can minimize transmission adaptation problems due to dynamic changes in data traffic load. Fourth, the interference avoidance mechanism of the present invention requires only limited coordination between the Macrocell and the Femtocell. On the one hand, it only needs to send/receive information about the size and distribution of the flexible reserved area through the IP backhaul link. On the other hand, 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. DRAWINGS

The above and other objects, features and advantages of the present invention will become more apparent from

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 Marocell 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. In this way, the Femtocell can only schedule resources of the inelastic reserved area to the UE it serves, and the Marocell 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 Marocell and the Femtocell.

In order to clearly illustrate the present invention, the elastic reserved area will first be described. As described above, the present invention adopts a resource reservation mechanism, and defines a flexible reservation zone (hereinafter referred to as FRZ) for Femtocell. When 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. Hereinafter, such a UE is referred to as an unauthorized Macrocell UE. According to the present invention, since the FRZ is defined for the Femtocell, 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. It can be seen that 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. The size of the FRZ may be determined by the Macrocell based on the current radio environment, the number of currently unlicensed Macrocell UEs, the average data traffic per unlicensed Macrocell UE, the previous FRZ size, or/and various other factors. As an example, the FRZ size can be determined according to the following formula:

S _FRZ i^ew = f _FRZ (X _MUE , X _Tra]rw , X ₀ ) + S _FRZ (Old)

Among them, 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, and X _Traf _ic indicates the average of each unauthorized Macrocell UE. Data traffic, X ₀ indicates other factors, and S _FRZ (01d) indicates the previous FRZ size. In general, the greater the number of unauthorized Macrocell UEs located in the Femtocell coverage area, the larger the FRZ size. As shown in Figure 2, at time 1, there is no unauthorized Macrocell UE in the Femtocell coverage area, so the FRZ does not include any resource blocks. At time 2, there is an unauthorized Macrocell UE in the Femtocell coverage area, and UE10, FRZ may include, for example, 2 resource blocks. Similarly, at time 3, two 'unauthorized Macrocell UEs, UE10 and UE20, located in the Femtocell coverage area, 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.

According to the embodiment of the present invention, 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. Thus, during subsequent frames, 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.

Since the size and distribution of the FRZ are semi-static, BP, which remains unchanged for a certain length of time, only needs to be updated periodically, so the signaling transmission overhead for resource reservation can be relatively small.

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. In addition, because the data traffic load is very dynamic, the resource blocks required by a Macrocell UE may vary over time. On the one hand, if the Macrocell UE does not need to transmit any data service for a certain period of time, the resource blocks are left unused, resulting in waste of resource blocks; on the other hand, if the Macrocell UE is in other time periods Data traffic is high, and these resource blocks are not enough to transmit data services, which may increase data transmission delay and impair user service quality. In response to the above problems, the present invention proposes a packet-based resource reservation mechanism. According to an embodiment of the present invention, 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. Those skilled in the art can understand that scheduling more Macrocell UEs during FRZ, the above-mentioned transmission problems caused by dynamic changes in data traffic load will be more easily solved.

Therefore, 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.

Those skilled in the art will appreciate that the number of Femtocells in each Femtocell group can be arbitrary and can be adjusted according to actual needs.

The FRZ according to an embodiment of the present invention has been described in detail above, and a resource scheduling method and system according to an embodiment of the present invention will be described in detail below with reference to FIGS. 1 and 4. In the following description, 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. In addition, 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. A suitable device to implement. In the present specification and its claims, "Macrocell" is equivalent to "Macrocell base station or enhanced base station", and "Femtocell" is equivalent to "Femtocell AP".

Referring again to FIG. 1, 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, 艮 P, enters the Femtocell coverage area, and interferes with the Femtocell AP. According to an embodiment of the present invention, 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.

The resource scheduling process performed by the resource scheduling system in the embodiment of the present invention is described below.

First, in 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.

According to an embodiment of the present invention, the UE 102 may send interference indication information in the following cases.

When the UE 102 enters the coverage area of the Femtocell, 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. Preferably, 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. In contrast, if the CSG ID is not in the "Allow CSG List", the UE 102 is an unauthorized Macrocell UE that cannot be switched to the Eemtocell. At this time, according to an embodiment of the present invention, the UE 102 sends an interference indication message to its serving Macrocell to initiate the present invention. The resource scheduling process using the resource reservation mechanism (FRZ) is adopted.

In addition, the resource scheduling process according to the embodiment of the present invention may also be initiated by the UE under certain conditions set according to actual application requirements. The present invention is not limited to the case of the above example, but may include any other application situation that can be conceived.

In step S402, the Macrocell receives the interference indication message, and according to the interference indication message, determines the FRZ size and distribution of the Femtocell with interference between the UE 102. The Macrocell can determine the size of the FRZ by considering various factors, such as the current radio environment, the number of unauthorized Macrocell UEs, the average data traffic of each Unauthorized Macrocell UE, the size of the original FRZ, and other relevant factors.

In addition, in the grouping mechanism as described above, if a plurality of Femtocells are embedded in the Macrocell, preferably, 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. Before the Macrocell determines the size and distribution of the flexible reserved area, 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. Alternatively, 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.

In 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. According to an embodiment of the present invention, the Macrocell can pass The IP backhaul link sends a resource reservation request message to the Femtocell.

In step S406, 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. According to the embodiment of the present invention, the current Femtocell may send a resource reservation response message to the Macrocell through the IP backhaul link.

In step S408, the Macrocell receives the resource reservation response message and will be in the subsequent resource scheduling.

The FRZ resource block is scheduled to the UE 102 to enable the UE 102 to use the FRZ resource block for data transmission.

According to an embodiment of the invention, since the FRZ is semi-static, 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. At the same time, 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.

The resource scheduling system and the resource scheduling method performed thereby according to an embodiment of the present invention are described above. With the method and system of the present invention, the problem of mutual interference of Femtocell-Macrocells occurring in the Femtocell deployment can be effectively solved. FRZ can be dynamically reserved through limited coordination between Femtocell-Macro. During FRZ, 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. ―

In the above description, a plurality of embodiments have been enumerated for the respective steps, and although the inventors have as far as possible to indicate the instances associated with each other, this does not mean that the examples necessarily have a corresponding relationship according to the corresponding reference numerals. As long as there is no contradiction between the conditions given by the selected instance, the corresponding technical solutions may be formed in different steps by selecting examples in which the labels do not correspond, and such technical solutions are also considered to be included in the present invention. Within the scope.

Those skilled in the art will readily recognize that the different steps of the above methods can be implemented by a programmed computer. Herein, 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. For example, 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.

It should be noted that in the above description, the technology of the present invention has been shown by way of example only. The solution, but does not mean that the invention is limited to the above steps and unit structure. Where possible, the steps and unit structure can be adjusted and traded as needed. Therefore, certain steps and elements are not essential elements for carrying out the general inventive concept of the invention. Therefore, the technical features necessary for the present invention are limited only by the minimum requirements that can realize the general inventive concept of the present invention, and are not limited by the above specific examples.

The invention has thus far been described in connection with the preferred embodiments. It will be appreciated that various other changes, substitutions and additions may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention is not limited to the specific embodiments described above, but is defined by the appended claims.

Claims

Claim

A resource scheduling method, configured to perform 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 a interference between the UE and one of the one or more Femtocells;

The current Femtocell receives the resource reservation request message, adjusts the flexible reserved area according to the request message, and sends a resource reservation response message to the Macrocell;

2. The method according to claim 1, wherein, when the UE served by the macrocell enters the coverage area of the current Femtocell, if it detects that there is interference with the current Femtocell, and determines that the current Femtocell cannot be switched, the interference indication is sent. Message.

3. The method according to claim 2, wherein 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 allowed CSG list saved on the UE. If the CSG ID of the current Femtocell is not in the allowed CSG list, it determines that the current Femtocell cannot be switched.

The method according to claim 3, wherein 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.

5. The method according to claim 1, wherein the Macrocell determines the size of the elastic reservation area of the current Femtocell according to one or more of the following factors:

Current radio environment; The number of UEs located in the coverage area of the current Femtocell but served by the Macrocell; the average data traffic of these UEs served by the Macrocell;

The size of the previous elastic reserve area of the current Femtocell.

6. The method of claim 1, wherein the flexible reserved area is composed of resource blocks.

7. The method according to claim 1, wherein if a plurality of macrocells are embedded

Femtocell, the multiple Femtocells are grouped in advance, and the same group of Femtocells share the same flexible reserved area.

8. The method according to claim 1, wherein if a plurality of macrocells are embedded

Femtocell, before the macrocell determines the size and distribution of the elastic reserved area, grouping the plurality of Femtocells, and determining which group the current Femtocell belongs to, to determine the size and distribution of the elastic reserved area for the group.

Among them, the same group of Femtocells share the same flexible reserved area.

9. The method of claim 7 or 8, wherein the plurality of Femtocells are grouped based on geographic location.

10. The method according to claim 1, further comprising: in a subsequent resource scheduling, the current Femtocell only allocates resources of the inelastic reserved area to the UE served by the current Femtocell.

The method according to claim 1, wherein the size and distribution of the elastic reserved area are semi-static.

12. The method according to claim 11, wherein the elastic reserved area of the Femtocell remains unchanged for a predetermined period of time after being adjusted, but is periodically updated.

13. The method of claim 1, wherein the Macrocell communicates with the current Femtocell via an IP backhaul link.

14. A resource scheduling system, comprising:

Macrocell,

One or more Femtocells embedded in the Macrocell, and

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 the UE exists between the UE and one of the one or more Femtocells. Interference

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 resources of the UE served by the Macrocell; sending a resource reservation request message to the current Femtocell, the request message includes information about the size and distribution of the flexible reservation area; and receiving a resource reservation response message from the current Femtocell, And scheduling the resources of the flexible reserved area to the UE in the subsequent resource scheduling, so that the UE can use the resources of the flexible reserved area for 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 Macrocell.