CN103024754A - Multi-carrier-based method for interference coordination among micro base stations - Google Patents
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Abstract
Description
技术领域 technical field
本发明涉及干扰协调技术,特别涉及一种基于多载波的微基站间干扰协调方法。The present invention relates to interference coordination technology, in particular to a multi-carrier-based interference coordination method between micro base stations.
背景技术 Background technique
现有研究表明,在长期演进先进(LTE-advanced)系统中引入异构网。异构网指宏小区下层还部署了微小区。如远程射频单元(RRH)、微微基站(Pico eNB)、家庭基站(Home eNB)和中继基站(relay eNB)。微小区的引入导致了更多的小区边界区域,从而造成额外的干扰。宏小区与微小区之间的功率不平衡对处于小区边界区域的UE造成尤为严重的干扰。异构网下典型的一种部署是宏小区(macro cell)+家庭基站小区(femto cell)(homeeNB),即宏基站与家庭基站并存。家庭基站通常采用CSG模式,只有具有CSG权限的用户可以接入。当没有CSG权限的UE处于CSG覆盖范围之内时,只能和宏基站进行数据通信,当宏基站和家庭基站使用同一频率时,会对这部分宏UE造成严重干扰,这部分UE我们称之为victim UE。Existing research shows that a heterogeneous network is introduced into a long-term evolution-advanced (LTE-advanced) system. A heterogeneous network refers to the deployment of micro cells under the macro cell. Such as remote radio unit (RRH), pico base station (Pico eNB), home base station (Home eNB) and relay base station (relay eNB). The introduction of microcells results in more cell border areas, which cause additional interference. The power imbalance between the macro cell and the micro cell causes particularly serious interference to UEs located in the cell boundary area. A typical deployment under a heterogeneous network is a macro cell (macro cell) + a femto cell (homeeNB), that is, a macro base station and a femto base station coexist. The home base station usually adopts CSG mode, and only users with CSG authority can access it. When a UE without CSG authority is within the CSG coverage, it can only communicate with the macro base station. When the macro base station and the home base station use the same frequency, it will cause serious interference to this part of the macro UE. We call this part of the UE For victim UE.
3gpp论坛探讨了很多缓解victim UE干扰的解决方案,其中一种解决方案为基于多载波实现macro eNB与home eNB间的干扰协调。如图1所示,假设有两个载波f1和f2,macro eNB对远离home eNB的macro UE可以在任意一个载波上传输控制信令及数据信息;对靠近home eNB的macro UE(即victim UE)和home UE,控制信息需要在不同的载波上传输,数据信息则可在任意载波上传输。The 3gpp forum has discussed many solutions for mitigating victim UE interference, one of which is to implement interference coordination between macro eNB and home eNB based on multi-carrier. As shown in Figure 1, assuming that there are two carriers f1 and f2, the macro eNB can transmit control signaling and data information on any carrier for the macro UE far away from the home eNB; for the macro UE close to the home eNB (ie victim UE) And home UE, control information needs to be transmitted on different carriers, and data information can be transmitted on any carrier.
现存方案中的家庭基站多载波模式是由OAM决定并通知家庭基站进行配置的,即预先设置好的,OAM很少会重新配置家庭基站所使用的多载波,这容易导致如下问题:The multi-carrier mode of the home base station in the existing solution is determined by the OAM and notified to the home base station for configuration, that is, it is pre-set, and the OAM rarely reconfigures the multi-carrier mode used by the home base station, which easily leads to the following problems:
因为家庭基站可随时随处开启,当home eNB分布密集时,可能同一个载波上的干扰较大;需要协调相互间的载波配置,现有算法不够灵活。Because home base stations can be turned on at any time and anywhere, when home eNBs are densely distributed, there may be greater interference on the same carrier; it is necessary to coordinate the carrier configuration between each other, and the existing algorithm is not flexible enough.
例如,OAM为某家庭基站配置了多载波,但并没有femto UE处在家庭基站的覆盖范围内,或者处在家庭基站范围内的femto UE数目极少,或占用资源较少,并不需要这些数量的载波,而同时相邻家庭基站的接入用户又不能使用这些载波的资源,因而导致了资源的浪费。For example, OAM configures multi-carriers for a home base station, but there are no femto UEs within the coverage of the home base station, or the number of femto UEs within the coverage of the home base station is very small, or the resource occupation is small, and these are not needed There are a large number of carriers, and at the same time, the access users of the adjacent home base stations cannot use the resources of these carriers, thus resulting in a waste of resources.
OAM为某家庭基站配置的载波资源较少,但有较多的femto UE处在家庭基站的覆盖范围内需要同时通信且数据量较大,而同时相邻家庭基站的接入用户数目很少,或当前使用数很少,及使用的资源量极少等状况,此时,本小区femto UE不能使用相邻家庭基站的资源,因而导致了资源的浪费。OAM configures fewer carrier resources for a home base station, but there are many femto UEs within the coverage of the home base station that need to communicate at the same time and have a large amount of data, while the number of access users of adjacent home base stations is small. Or the number of current uses is very small, and the amount of resources used is extremely small. At this time, the femto UE in this cell cannot use the resources of the adjacent home base station, thus resulting in a waste of resources.
综上所述,现有技术解决CSG家庭基站之间造成强干扰问题时,为家庭基站固定预留设置某些载波,将导致部分小区资源不足或资源浪费,不能提高对多载波资源的利用率。To sum up, when the existing technology solves the problem of strong interference between CSG home base stations, some carriers are fixedly reserved for the home base stations, which will lead to insufficient resources or waste of resources in some cells, and cannot improve the utilization rate of multi-carrier resources. .
此外,对于一些企业等应用家庭基站的场合,由于其家庭基站可以采用相同的CSG ID,因此家庭基站间存在X2接口。Pico eNB间亦存在X2接口。In addition, for some enterprises and other occasions where femtocells are used, because the femtocells can use the same CSG ID, there is an X2 interface between femtocells. There is also an X2 interface between Pico eNBs.
鉴于异构网下严重的干扰问题,当利用多载波技术来缓解微基站对宏基站一侧的victim UE的干扰时,宏基站及home eNB所作出的对victim UE发送PDCCH的载波配置应该不冲突,从而最小化victim UE控制信道上遭受的干扰。In view of the serious interference problem under the heterogeneous network, when the multi-carrier technology is used to alleviate the interference of the micro base station to the victim UE on the side of the macro base station, the carrier configuration of the macro base station and the home eNB to send the PDCCH to the victim UE should not conflict , so as to minimize the interference suffered by the victim UE on the control channel.
此外,3gpp论坛也在探讨当微基站密集调度时相互间遭受的强干扰。如图2所示,home eNB分布密集时,期望在载波分配时,不仅victim UE使用的载波要与家庭基站所用的不同,而且家庭基站间也应该尽量采用不同的载波以减少相互间的干扰。同样,pico cell分布密集时,也存在类似的问题,互相间应尽量采用不同的载波以减少相互间的干扰。In addition, the 3GPP forum is also discussing the strong interference between micro base stations when they are intensively scheduled. As shown in Figure 2, when the home eNBs are densely distributed, it is expected that not only the carrier used by the victim UE should be different from that used by the home base station, but also that the home base stations should use different carriers as much as possible to reduce mutual interference. Similarly, similar problems exist when pico cells are densely distributed, and different carriers should be used as much as possible to reduce mutual interference.
发明内容 Contents of the invention
本发明提供了一种基于多载波的干扰协调方法,能够有效缓解微基站间的相互干扰,改善小区边缘用户的性能。The invention provides an interference coordination method based on multi-carriers, which can effectively alleviate the mutual interference between small base stations and improve the performance of cell edge users.
为实现上述目的,本发明采用如下的技术方案:To achieve the above object, the present invention adopts the following technical solutions:
一种基于多载波的干扰协调方法,包括:A multi-carrier-based interference coordination method, comprising:
微基站接收相邻微基站发送的载波配置状况;The micro base station receives the carrier configuration status sent by the adjacent micro base station;
所述微基站根据接收的所述载波配置状况,按照与所述相邻微基站的载波配置相异的原则,进行本小区的载波配置。The micro base station configures the carrier of the cell according to the received carrier configuration status and according to the principle of being different from the carrier configuration of the adjacent micro base station.
较佳地,当所述相邻微基站支持单载波配置时,所述发送的载波配置状况为:所述相邻微基站当前采用的单载波。Preferably, when the adjacent micro base station supports single carrier configuration, the transmitted carrier configuration status is: the single carrier currently used by the adjacent micro base station.
较佳地,相邻微基站发送载波配置状况的方式为:Preferably, the manner in which the adjacent micro base station sends the carrier configuration status is as follows:
采用多载波比特位图的方式携带所述当前采用的单载波;其中,所述多载波比特位图的每一比特代表一个载波,比特被置位表示相应载波为所述当前采用的单载波;Using a multi-carrier bitmap to carry the currently used single carrier; wherein, each bit of the multi-carrier bitmap represents a carrier, and a bit is set to indicate that the corresponding carrier is the currently used single carrier;
或者,or,
将所述当前采用的单载波的小区标识号发送给所述微基站。Sending the cell identification number of the currently used single carrier to the micro base station.
较佳地,当所述相邻微基站支持多载波配置时,所述发送的载波配置状况为:所述相邻微基站当前采用的基本覆盖载波及辅助容量载波配置状况;其中,所述辅助容量载波为不传输控制信息或以降低的功率传输控制信息的载波。Preferably, when the adjacent micro base station supports multi-carrier configuration, the transmitted carrier configuration status is: the configuration status of the basic coverage carrier and auxiliary capacity carrier currently used by the adjacent micro base station; wherein, the auxiliary A capacity carrier is a carrier that transmits no control information or transmits control information at reduced power.
较佳地,相邻微基站发送所述载波配置状况的方式为:Preferably, the manner in which the adjacent micro base station sends the carrier configuration status is:
采用多载波比特位图的方式携带所述载波配置状况;其中,所述多载波比特位图的每一比特代表一个载波,比特被置位表示相应载波为所述基本覆盖载波,比特未被置位表示相应载波为所述辅助容量载波;The carrier configuration status is carried in the form of a multi-carrier bitmap; wherein, each bit of the multi-carrier bitmap represents a carrier, and a bit is set to indicate that the corresponding carrier is the basic coverage carrier, and a bit is not set bit indicates that the corresponding carrier is the auxiliary capacity carrier;
或者,or,
将所述当前采用的基本覆盖载波的小区标识号发送给所述微基站。Sending the cell identification number of the currently used basic coverage carrier to the micro base station.
较佳地,所述发送的载波配置状况为:所述相邻微基站的邻基站可用的载波资源信息。Preferably, the transmitted carrier configuration status is: carrier resource information available to neighboring base stations of the neighboring micro base station.
较佳地,相邻微基站发送所述载波配置状况的方式为:Preferably, the manner in which the adjacent micro base station sends the carrier configuration status is:
采用多载波比特位图的方式携带所述相邻微基站的邻基站可用的载波资源信息;其中,所述多载波比特位图的每一比特代表一个载波,比特被置位表示相应载波为所述相邻微基站的邻基站可用的载波;A multi-carrier bitmap is used to carry carrier resource information available to neighboring base stations of the adjacent micro base station; wherein, each bit of the multi-carrier bitmap represents a carrier, and a bit is set to indicate that the corresponding carrier is all Carriers available to adjacent base stations of the adjacent micro base station;
或者,将所述相邻微基站的邻基站可用的载波在小区中的标识号发送给所述微基站。Or, sending the identification number of the carrier in the cell available to the adjacent base station of the adjacent micro base station to the micro base station.
较佳地,所述微基站接收所述相邻微基站发送的载波配置状况时,进一步接收所述相邻微基站发送的多载波干扰协调功能被激活的信息。Preferably, when the micro base station receives the carrier configuration status sent by the neighboring micro base station, it further receives information that the multi-carrier interference coordination function is activated sent by the neighboring micro base station.
较佳地,通过微基站间的X2接口接收所述载波配置状况和所述多载波干扰协调功能被激活的信息。Preferably, the information about the carrier configuration status and the activation of the multi-carrier interference coordination function is received through the X2 interface between the micro base stations.
较佳地,在所述微基站进行本小区的载波配置后,该方法进一步包括:Preferably, after the micro base station configures the carrier of the cell, the method further includes:
当所述微基站支持单载波配置时,所述微基站将自身配置的载波上进行小区间干扰协调的UE占用的PRB比例发送给所述相邻微基站,作为所述相邻微基站在载波资源数有限情况下的载波调整依据;其中,所述PRB比例为,所述自身配置的载波上进行小区间干扰协调的UE所使用的PRB个数除以所述载波上最大可获得的PRB个数;When the micro base station supports single carrier configuration, the micro base station sends the proportion of PRBs occupied by UEs performing inter-cell interference coordination on the carrier configured by the micro base station to the neighboring micro base station as the Carrier adjustment basis when the number of resources is limited; wherein, the PRB ratio is the number of PRBs used by UEs performing inter-cell interference coordination on the self-configured carrier divided by the maximum available PRB on the carrier number;
当所述微基站支持多载波配置时,所述微基站将自身配置的载波上进行小区间干扰协调的UE占用CCE的比例发送给所述相邻微基站,作为所述相邻微基站在载波资源数有限情况下的载波调整依据;所述CCE比例为,当前所有基本覆盖载波上进行小区间干扰协调的UE所使用的CCE个数除以所述当前所有基本覆盖载波上最大可获得的CCE个数。When the micro base station supports multi-carrier configuration, the micro base station sends the proportion of CCEs occupied by UEs performing inter-cell interference coordination on the carrier configured by the micro base station to the neighboring micro base station, as the carrier of the neighboring micro base station Carrier adjustment basis when the number of resources is limited; the CCE ratio is the number of CCEs used by UEs performing inter-cell interference coordination on all current basic coverage carriers divided by the maximum available CCE on all current basic coverage carriers number.
较佳地,所述进行小区间干扰协调的UE为小区边缘受到强干扰的UE。Preferably, the UE performing inter-cell interference coordination is a UE that suffers from strong interference at the edge of a cell.
较佳地,在所述微基站进行本小区的载波配置后,该方法进一步包括:所述微基站将本小区配置的载波信息反馈给所述相邻微基站。Preferably, after the micro base station configures the carrier of the local cell, the method further includes: the micro base station feeds back the information of the carrier configured in the local cell to the adjacent micro base station.
较佳地,当所述微基站支持单载波配置时,所述微基站将本小区配置的载波信息反馈给所述相邻微基站为:Preferably, when the micro base station supports single carrier configuration, the micro base station feeds back the carrier information configured in its own cell to the adjacent micro base station as follows:
采用多载波比特位图的方式携带所述本小区配置的载波信息;其中,所述多载波比特位图的每一比特代表一个载波,比特被置位表示相应载波为本小区配置的单载波;Using a multi-carrier bitmap to carry the carrier information configured in the cell; wherein, each bit of the multi-carrier bitmap represents a carrier, and a bit is set to indicate that the corresponding carrier is a single carrier configured in the cell;
或者,将所述本小区配置的单载波的小区标识号发送给所述相邻微基站。Or, sending the cell identification number of the single carrier configured in the current cell to the adjacent micro base station.
较佳地,当所述微基站支持单载波配置时,所述微基站将本小区配置的载波信息通过载波信息信元反馈给所述相邻微基站。Preferably, when the micro base station supports single carrier configuration, the micro base station feeds back the carrier information configured in the local cell to the adjacent micro base station through a carrier information information element.
较佳地,当所述微基站支持多载波配置时,所述述微基站将本小区配置的载波信息反馈给所述相邻微基站为:Preferably, when the micro base station supports multi-carrier configuration, the micro base station feeds back the carrier information configured in this cell to the adjacent micro base station as follows:
采用多载波比特位图的方式携带所述本小区配置的载波信息;其中,所述多载波比特位图的每一比特代表一个载波,比特被置位表示相应载波为本小区配置的基本覆盖载波,比特未被置位表示相应载波为本小区配置的辅助容量载波;其中,所述辅助容量载波为不传输控制信息或以降低的功率传输控制信息的载波;The carrier information configured by the cell is carried in the form of a multi-carrier bitmap; wherein, each bit of the multi-carrier bitmap represents a carrier, and a bit is set to indicate that the corresponding carrier is the basic coverage carrier configured by the cell , the bit is not set to indicate that the corresponding carrier is an auxiliary capacity carrier configured by the cell; wherein, the auxiliary capacity carrier is a carrier that does not transmit control information or transmits control information with reduced power;
或者,将所述本小区配置的基本覆盖载波的小区标识号发送给所述相邻微基站。Or, sending the cell identification number of the basic coverage carrier configured in the current cell to the adjacent micro base station.
较佳地,当所述微基站支持多载波配置时,所述微基站将本小区配置的载波信息通过基本覆盖载波信息信元反馈给所述相邻微基站。Preferably, when the micro base station supports multi-carrier configuration, the micro base station feeds back the carrier information configured in the local cell to the adjacent micro base station through a basic coverage carrier information information element.
较佳地,运维系统(OAM)在微基站端配置一致的载波映射,映射的载波为系统中的所有载波或预先定义的载波子集中的载波;所述载波子集中的载波数目根据实际需要设定。Preferably, the operation and maintenance system (OAM) configures consistent carrier mapping at the micro base station, and the mapped carriers are all carriers in the system or carriers in a predefined carrier subset; the number of carriers in the carrier subset is based on actual needs set up.
较佳地,所述载波的小区标识号为载波的载频标识。Preferably, the cell identification number of the carrier is the carrier frequency identification of the carrier.
由上述技术方案可见,本发明中,微基站接收相邻微基站发送的载波配置状况;微基站根据接收的载波配置状况,按照与相邻微基站的载波配置相异的原则,进行本小区的载波配置。通过上述微基站的载波配置,保证相邻微基站间载波配置不同,从而降低微基站间的相互干扰,改善小区边缘用户的性能。It can be seen from the above technical solution that in the present invention, the micro base station receives the carrier configuration status sent by the adjacent micro base station; the micro base station performs the configuration of the cell according to the received carrier configuration status and the principle that the carrier configuration of the adjacent micro base station is different from that of the adjacent micro base station. carrier configuration. Through the carrier configuration of the above micro base stations, it is ensured that the carrier configurations between adjacent micro base stations are different, thereby reducing mutual interference between micro base stations and improving the performance of cell edge users.
附图说明 Description of drawings
图1为现有干扰协调示意图一;FIG. 1 is a schematic diagram 1 of existing interference coordination;
图2为现有干扰协调示意图二;FIG. 2 is a second schematic diagram of existing interference coordination;
图3为本发明中基于多载波的干扰协调方法的流程示意图。FIG. 3 is a schematic flow chart of a multi-carrier-based interference coordination method in the present invention.
具体实施方式 Detailed ways
为使本发明的目的、技术手段和优点更加清楚明白,以下结合附图对本发明做进一步详细说明。In order to make the purpose, technical means and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.
本发明的基本思想是:在干扰协调机制启动时,要求微基站在与相邻微基站间的控制接口上传递多个载波的配置状况,从而辅助相邻微基站决定其自身载波配置时避免相互间的冲突,减少干扰,实现基于多载波的微基站间的干扰协调。The basic idea of the present invention is: when the interference coordination mechanism is started, the micro base station is required to transmit the configuration status of multiple carriers on the control interface with the adjacent micro base station, so as to assist the adjacent micro base station to avoid mutual interference when deciding its own carrier configuration. Interference between small base stations can be reduced, and interference coordination between micro base stations based on multi-carriers can be realized.
图3为本发明中基于多载波的干扰协调方法的流程示意图。图3所示的方法以对微基站A进行干扰协调为例进行说明,如图3所示,该方法包括:FIG. 3 is a schematic flow chart of a multi-carrier-based interference coordination method in the present invention. The method shown in FIG. 3 is described by taking the interference coordination of the micro base station A as an example. As shown in FIG. 3, the method includes:
步骤301,微基站A接收相邻微基站发送的载波配置状况。
本步骤中,微基站A接收的载波配置状况为相邻微基站通过X2接口发送的。In this step, the carrier configuration status received by the micro base station A is sent by the neighboring micro base station through the X2 interface.
其中,相邻微基站B发送的载波配置状况可以根据需要定义为不同的形式,发送载波配置状况的具体方式也可以采用多种形式,以下分别进行描述。Wherein, the carrier configuration status sent by the adjacent micro base station B can be defined in different forms according to needs, and the specific manner of sending the carrier configuration status can also adopt various forms, which will be described respectively below.
载波配置状况的定义可以有如下两种:The definition of carrier configuration status can be as follows:
一、当微基站B支持单载波配置时,载波的配置状况定义为:微基站B当前采用的单载波;当微基站B支持多载波配置时,载波的配置状况定义为:微基站B当前采用的基本覆盖载波和辅助容量载波。其中,基本覆盖载波即通常意义上的载波,辅助容量载波即不传输PDCCH等控制信息或以降低的功率传输PDCCH等控制信息的载波。在上述载波配置状况的定义下,微基站A接收相邻微基站B发送的载波配置状况后,即能够直接明确微基站B自身占用的载波情况。1. When the micro base station B supports single carrier configuration, the carrier configuration status is defined as: the single carrier currently used by the micro base station B; when the micro base station B supports multi-carrier configuration, the carrier configuration status is defined as: the micro base station B currently uses basic coverage carrier and auxiliary capacity carrier. Wherein, the basic coverage carrier is a carrier in a general sense, and the auxiliary capacity carrier is a carrier that does not transmit control information such as PDCCH or transmits control information such as PDCCH with reduced power. Under the definition of the carrier configuration status above, after receiving the carrier configuration status sent by the neighboring micro base station B, the micro base station A can directly determine the carrier status occupied by the micro base station B itself.
二、无论微基站B支持的是单载波配置还是多载波配置(即支持载波聚合),载波的配置状况均定义为:微基站B的相邻基站可用的载波资源信息。在这种载波配置状况的定义下,微基站A接收相邻微基站B发送的载波配置状况后,能够直接确定自身可用的载波资源。2. Regardless of whether the micro base station B supports single-carrier configuration or multi-carrier configuration (that is, supports carrier aggregation), the carrier configuration status is defined as: carrier resource information available to neighboring base stations of the micro base station B. Under the definition of the carrier configuration status, after the micro base station A receives the carrier configuration status sent by the neighboring micro base station B, it can directly determine its available carrier resources.
对于上述两种载波配置状况,进行载波配置状况发送时,均可以通过X2接口的现有消息(例如,load information消息或eNB configuration update消息或X2 Setup Request/X2 Setup Response message等)或自定义消息发送。具体在携带载波配置状况时,可以通过多载波比特位图的方式或直接携带载波的小区标识号的方式。具体地,For the above two carrier configuration statuses, when sending the carrier configuration status, the existing messages of the X2 interface (for example, load information messages or eNB configuration update messages or X2 Setup Request/X2 Setup Response messages, etc.) or custom messages can be used. send. Specifically, when carrying the configuration status of the carrier, it may be carried in the manner of a multi-carrier bitmap or directly in the manner of carrying the cell identification number of the carrier. specifically,
对于第一种载波配置状况定义,采用多载波比特位图方式携带载波配置状况的具体方式可以为:For the definition of the first carrier configuration status, the specific method of carrying the carrier configuration status in the way of multi-carrier bitmap can be as follows:
当微基站B支持单载波配置时,多载波比特位图的每一比特代表一个载波,比特被置位(例如该比特置为1)表示相应载波为微基站B当前采用的单载波,比特未被置位(例如该比特为0)表示相应载波为微基站当前未采用的载波;When the micro base station B supports single-carrier configuration, each bit of the multi-carrier bitmap represents a carrier, and the bit is set (for example, the bit is set to 1) to indicate that the corresponding carrier is the single carrier currently used by the micro base station B. Being set (for example, the bit is 0) indicates that the corresponding carrier is a carrier not currently used by the micro base station;
当微基站B支持多载波配置时,多载波比特位图的每一比特代表一个载波,比特被置位(例如该比特置为1)表示相应载波为微基站B采用的基本覆盖载波,比特未被置位(例如该比特为0)表示相应载波PDCCH传输功率减少或为0,即相应载波为微基站B采用的辅助容量载波。When the micro base station B supports multi-carrier configuration, each bit of the multi-carrier bitmap represents a carrier, and the bit is set (for example, the bit is set to 1) to indicate that the corresponding carrier is the basic coverage carrier adopted by the micro base station B. Being set (for example, the bit is 0) indicates that the PDCCH transmission power of the corresponding carrier is reduced or is 0, that is, the corresponding carrier is an auxiliary capacity carrier adopted by the micro base station B.
对于第一种载波配置状况定义,采用直接携带载波的小区标识号的方式的具体方式可以为:For the definition of the first carrier configuration status, the specific method of directly carrying the cell identification number of the carrier may be as follows:
当微基站B支持单载波配置时,直接将微基站B当前采用的单载波的小区标识号(具体可以为载频标识即LTE系统中的EARFCN)发送给微基站A。When the micro base station B supports single-carrier configuration, it directly sends the cell identification number of the single carrier currently used by the micro base station B (specifically, it can be the carrier frequency identification, that is, the EARFCN in the LTE system) to the micro base station A.
当微基站B支持多载波配置时,直接将微基站B当前采用的基本覆盖载波的小区标识号(具体可以为载频标识即LTE系统中的EARFCN)发送给微基站A。When the micro base station B supports multi-carrier configuration, it directly sends the cell identification number (specifically, the carrier frequency identification, EARFCN in the LTE system) of the basic coverage carrier currently used by the micro base station B to the micro base station A.
对于第二种载波配置状况定义,采用多载波比特位图方式携带载波配置状况的具体方式可以为:多载波比特位图的每一比特代表一个载波,比特被置位(例如该比特置为1)表示相应载波PDCCH传输功率不减少,即相应载波为微基站B的邻基站可用的载波资源;比特未被置位(例如该比特为0)表示相应载波PDCCH传输功率减少或为0,即相应载波为微基站B的邻基站不可用的载波资源。For the definition of the second carrier configuration status, the specific way to carry the carrier configuration status in the multi-carrier bitmap mode can be: each bit of the multi-carrier bitmap represents a carrier, and the bit is set (for example, the bit is set to 1 ) indicates that the PDCCH transmission power of the corresponding carrier does not decrease, that is, the corresponding carrier is the carrier resource available to the neighboring base stations of the micro base station B; the bit is not set (for example, the bit is 0) indicates that the PDCCH transmission power of the corresponding carrier is reduced or is 0, that is, the corresponding The carrier is a carrier resource unavailable to neighboring base stations of the micro base station B.
对于第二种载波配置状况定义,采用直接携带载波的小区标识号的方式的具体方式可以为:将微基站B的邻基站可用的载波在小区中的标识号(具体可以为载频标识即LTE系统中的EARFCN)发送给微基站AFor the definition of the second carrier configuration status, the specific method of directly carrying the cell identification number of the carrier can be: the identification number of the carrier in the cell that is available to the adjacent base station of the micro base station B (specifically, it can be the carrier frequency identification, that is, the LTE EARFCN in the system) to the micro base station A
上述方法中以多载波比特位图的方式携带所述相邻微基站可用的载波资源信息及不可用的载波资源信息,其中所指的载波可以是系统中全部的载波,也可以是为某一目的特定定义的某一载波子集,诸如一些微小区(如企业网中的home eNB)小范围内所使用到的载波集合。这里需要说明的是,在具体实施时,需要运维系统(OAM)在macro eNB与Home eNB端配置一致的载波映射,从而使得双方能获知PCC/SCC configuration pattern information中每个比特位对应的载波。载波映射具体为不同的载波的小区标识对应的PCC/SCC configuration pattern information中的比特位。OAM配置时,可以依据现有带宽中的载波频点升序或降序对应PCC/SCC configuration patterninformation的bit string从第1比特到第N比特。In the above method, the available carrier resource information and the unavailable carrier resource information of the adjacent micro base station are carried in the form of a multi-carrier bitmap, where the referred carrier can be all carriers in the system, or can be a certain A subset of carriers defined specifically for the purpose, such as a set of carriers used in a small area of some micro cells (such as home eNB in an enterprise network). What needs to be explained here is that in the specific implementation, the operation and maintenance system (OAM) needs to configure consistent carrier mapping on the macro eNB and Home eNB, so that both parties can know the carrier corresponding to each bit in the PCC/SCC configuration pattern information . The carrier mapping is specifically the bits in the PCC/SCC configuration pattern information corresponding to the cell identities of different carriers. During OAM configuration, the bit string corresponding to the PCC/SCC configuration pattern information can be from the 1st bit to the Nth bit in ascending or descending order according to the carrier frequency points in the existing bandwidth.
同时,在上述微基站B发送载波配置状况时,还可以进一步在相同的消息中携带用于指示多载波干扰协调功能被激活的信息。At the same time, when the micro base station B sends the carrier configuration status, it may further carry information for indicating that the multi-carrier interference coordination function is activated in the same message.
一个具体发送相应信息的例子如下:可以在接口消息(例如loadinformation消息)中增加两个IE,即基本覆盖载波/辅助容量载波配置模式信息(PCC/SCC configuration pattern info)和基本覆盖载波/辅助容量载波配置信息不激活(PCC/SCC configuration information Inactive)两个IE。其中,基本覆盖载波/辅助容量载波配置模式信息信元携带基本覆盖载波和辅助容量载波的配置信息;基本覆盖载波/辅助容量载波配置信息不激活信元携带用于指示多载波干扰协调功能被激活的信息。A specific example of sending the corresponding information is as follows: two IEs can be added to the interface message (such as the loadinformation message), namely the basic coverage carrier/secondary capacity carrier configuration pattern information (PCC/SCC configuration pattern info) and the basic coverage carrier/secondary capacity Carrier configuration information inactive (PCC/SCC configuration information Inactive) two IEs. Among them, the basic coverage carrier/auxiliary capacity carrier configuration mode information element carries the configuration information of the basic coverage carrier and the auxiliary capacity carrier; the basic coverage carrier/auxiliary capacity carrier configuration information element carries the activation information for indicating that the multi-carrier interference coordination function is activated Information.
步骤302,微基站A根据步骤301中接收的载波配置状况,按照与相邻微基站的载波配置相异的原则,进行本小区的载波配置。
在本步骤中,根据相邻微基站发送的载波配置状况,进行本小区的载波配置,且进行载波配置时,保证与相邻微基站的载波配置相异,从而降低微基站间的相互干扰,改善小区边缘用户的性能。In this step, according to the carrier configuration status sent by the adjacent micro base stations, the carrier configuration of the cell is performed, and when the carrier configuration is performed, it is ensured that it is different from the carrier configuration of the adjacent micro base stations, thereby reducing the mutual interference between the micro base stations, Improve performance for cell edge users.
上述即为本发明中干扰协调方法的基本流程。进一步地,在上述流程基础上,优选地,还可以通过如下步骤303和/或步骤304,进一步向相邻微基站反馈信息,用于相邻微基站进一步载波配置和调整的依据,进一步降低微基站间的干扰。具体操作可以如下进行:The above is the basic flow of the interference coordination method in the present invention. Further, on the basis of the above process, preferably, the following
步骤303,微基站A将自身配置的载波上需要小区间干扰协调UE占用的物理资源比例发送给相邻微基站B。In
本步骤中,微基站将自身配置的载波上需要小区间干扰协调UE的资源占用状况通知给相邻微基站B,从而为相邻微基站B的进一步载波调整提供依据。In this step, the Femtocell notifies the adjacent Femtocell B of the resource occupancy status of the UE that requires inter-cell interference coordination on the carrier configured by itself, so as to provide a basis for further carrier adjustment of the neighboring Femtocell B.
具体地,当微基站A支持单载波配置时,微基站A将自身配置的载波上进行小区间干扰协调的UE占用的PRB比例发送给相邻微基站B;Specifically, when the micro base station A supports single-carrier configuration, the micro base station A sends the PRB ratio occupied by the UE performing inter-cell interference coordination on the carrier configured by itself to the neighboring micro base station B;
当微基站A支持多载波配置时,微基站A将自身配置的载波上进行小区间干扰协调的UE占用CCE的比例发送给相邻微基站B。When the micro base station A supports multi-carrier configuration, the micro base station A sends to the adjacent micro base station B the proportion of CCEs occupied by UEs performing inter-cell interference coordination on the configured carrier.
通过上述发送的UE资源占用状况,相邻微基站B可以据此,在载波资源数有限情况决定是否能使用微基站A所配置的载波,以实现相邻微基站B及微基站A对承载的自适应调整。Based on the UE resource occupancy status sent above, the adjacent micro base station B can decide whether to use the carrier configured by the micro base station A when the number of carrier resources is limited, so as to realize the load sharing between the adjacent micro base station B and the micro base station A. Adaptive adjustment.
具体PRB的比例可以利用现有协议中的IE,也可以重新定义为高干扰UE所占用的PRB个数/总的PRB个数;The specific ratio of PRB can use the IE in the existing protocol, and can also be redefined as the number of PRBs occupied by high-interference UEs/total number of PRBs;
下面解释其应用场景如下:The following explains its application scenarios as follows:
Case1:home eNB1支持单载波,home eNB2支持载波聚合:Case1: home eNB1 supports single carrier, and home eNB2 supports carrier aggregation:
鉴于home eNB1支持的是单载波,本发明根据PRB反馈当前载波的负载状况;Since home eNB1 supports a single carrier, the present invention feeds back the load status of the current carrier according to the PRB;
具体处理如下:如果home eNB1负载高,home eNB2可以不考虑作任何处理;如果home eNB1负载低,home eNB2可以借用home eNB1的整个单载波使用;当然,即使PRB低,控制信道负载不见得低,无论如何,只要home eNB2对控制信道的负载控制在适当范围内,对home eNB1的干扰都是可以接受的,因为对控制信道负载的减少等效于PDCCH功率的降低,或者可以理解为保证有一定数量的CCE功率为0,利用分集(diversity)保证home eNB1的控制信道的接收;另外一种方案是home eNB2只借用homeeNB1的单载波数据信道使用,这样的话,对控制信道无影响。The specific processing is as follows: if the load of home eNB1 is high, home eNB2 may not consider any processing; if the load of home eNB1 is low, home eNB2 can borrow the entire single carrier of home eNB1; of course, even if the PRB is low, the load of the control channel may not be low, In any case, as long as the control channel load of home eNB2 is controlled within an appropriate range, the interference to home eNB1 is acceptable, because the reduction of control channel load is equivalent to the reduction of PDCCH power, or it can be understood as ensuring a certain The power of the number of CCEs is 0, and diversity is used to ensure the reception of the control channel of home eNB1; another solution is that home eNB2 only uses the single-carrier data channel of homeeNB1, in this case, there is no impact on the control channel.
Case2:当home eNB1支持载波聚合,home eNB2也支持载波聚合时:Case2: When home eNB1 supports carrier aggregation and home eNB2 also supports carrier aggregation:
这种情况下,要求反馈CCE占用比例,定义为高干扰UE所占用CCE的个数/可获得的所有CCE的个数;这里通常控制信道占用3个OFDM符号,所以以3个OFDM符号所可获得的CCE个数作为所有CCE个数的基准。这样某home eNB过载时可以借用相邻的home eNB的某载波使用;详见之前提过的算法专利;In this case, it is required to feedback the CCE occupancy ratio, which is defined as the number of CCEs occupied by high-interference UEs/the number of all available CCEs; here, the control channel usually occupies 3 OFDM symbols, so 3 OFDM symbols can The number of CCEs obtained serves as the benchmark for all CCEs. In this way, when a home eNB is overloaded, it can use a carrier of an adjacent home eNB; see the algorithm patent mentioned earlier for details;
对于case1,如果反馈CCE,没有办法了解PRB状态,如果CCE占用比例低,不见得数据信道空闲,这样对于home eNB2仍然起不到缓解过载的作用。所以建议单载波与多载波不同的情况,反馈不同的PRB或CCE占用比例。For case1, if the CCE is fed back, there is no way to know the PRB status. If the CCE occupancy ratio is low, the data channel may not be idle, so it still cannot relieve the overload of the home eNB2. Therefore, it is recommended that different PRB or CCE occupancy ratios be fed back when single carrier and multi-carrier are different.
步骤304,微基站A将本小区配置的载波信息反馈给相邻微基站B。In step 304, the micro base station A feeds back the carrier information configured in this cell to the neighboring micro base station B.
具体在微基站A反馈本小区配置的载波信息时,可以采用多载波比特位图的方式,或者也可以直接携带载波的小区标识。具体实现可以如下:Specifically, when the micro base station A feeds back the carrier information configured in the cell, it may adopt a multi-carrier bitmap manner, or may directly carry the cell identifier of the carrier. The specific implementation can be as follows:
采用多载波比特位图的方式携带本小区配置的载波信息时,当微基站A支持单载波配置时,多载波比特位图的每一比特代表一个载波,比特被置位(例如该比特置为1)表示相应载波为本小区配置的单载波,比特未被置位(例如该比特为0)表示相应载波为本小区未采用的载波;当微基站A支持多载波配置时,多载波比特位图的每一比特代表一个载波,比特被置位(例如该比特置为1)表示相应载波为本小区配置的基本覆盖载波,比特未被置位(例如该比特为0)表示相应载波为本小区配置的辅助容量载波。When the multi-carrier bitmap is used to carry the carrier information configured in the cell, when the micro base station A supports single-carrier configuration, each bit of the multi-carrier bitmap represents a carrier, and the bit is set (for example, the bit is set to 1) Indicates that the corresponding carrier is a single carrier configured in the cell, and the bit is not set (for example, the bit is 0) to indicate that the corresponding carrier is a carrier not used in the cell; when the micro base station A supports multi-carrier configuration, the multi-carrier bit Each bit in the figure represents a carrier. When a bit is set (for example, the bit is set to 1), it means that the corresponding carrier is the basic coverage carrier configured by the cell. If the bit is not set (for example, the bit is 0), it means that the corresponding carrier is The auxiliary capacity carrier configured by the cell.
采用直接携带载波的小区标识号的方式时,当微基站A支持单载波配置时,将本小区配置的单载波的小区标识号(具体可以为载频标识即LTE系统中的EARFCN)发送给相邻微基站B,具体可以通过资源状态响应消息中的载波信息信元反馈;当微基站A支持多载波配置时,将本小区配置的基本覆盖载波的小区标识号(具体可以为载频标识即LTE系统中的EARFCN)发送给相邻微基站B,具体可以通过资源状态响应消息中的基本覆盖载波信息信元反馈。When the method of directly carrying the cell identification number of the carrier is adopted, when the micro base station A supports single carrier configuration, the cell identification number of the single carrier configured in this cell (specifically, it can be the carrier frequency identification, that is, the EARFCN in the LTE system) is sent to the corresponding The adjacent micro base station B can specifically feed back through the carrier information information element in the resource status response message; when the micro base station A supports multi-carrier configuration, the cell identification number of the basic coverage carrier configured in this cell (specifically, it can be the carrier frequency identification is EARFCN) in the LTE system is sent to the adjacent micro base station B, specifically, it can be fed back through the basic coverage carrier information information element in the resource status response message.
上述本小区配置的载波信息反馈,可以用于相邻微基站B根据其信道状况和负载状况进行载波配置的调整。The above-mentioned carrier information feedback configured in the local cell can be used for the adjacent micro base station B to adjust the carrier configuration according to its channel condition and load condition.
至此,本发明中的完整方法流程结束。其中,步骤303和304可以任意顺序执行。通过上述方式,能够在微基站间传输载波配置情况,微基站根据接收的载波配置情况进行自身的载波配置或负载调整,从而能够降低微基站间的相互干扰,改善小区边缘用户的性能。So far, the entire method flow in the present invention ends. Wherein, steps 303 and 304 may be performed in any order. Through the above method, the carrier configuration can be transmitted between the micro base stations, and the micro base station can perform its own carrier configuration or load adjustment according to the received carrier configuration, so as to reduce the mutual interference between the micro base stations and improve the performance of the cell edge users.
以上所述仅为本发明的较佳实施例而已,并不用以限制本发明,凡在本发明的精神和原则之内,所做的任何修改、等同替换、改进等,均应包含在本发明保护的范围之内。The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection.
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