CN101043640A - Method and system for obtaining wireless resource management information in evolvement network - Google Patents
Method and system for obtaining wireless resource management information in evolvement network Download PDFInfo
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Abstract
本发明提供一种演进网络中无线资源管理信息获取方法及系统,其中,由用户设备获取相邻小区无线资源管理信息,并将获取的相邻小区无线资源管理信息发送给本小区基站进行处理。用于解决在基站之间获取RRM信息的问题。本发明的优势在于,不需要在基站之间进行信令交互实现负载资源的传输,以很小的代价完成了邻小区负载信息的传送。
The present invention provides a method and system for acquiring radio resource management information in an evolved network, wherein user equipment acquires radio resource management information of neighboring cells, and sends the acquired radio resource management information of neighboring cells to the base station of the local cell for processing. It is used to solve the problem of obtaining RRM information between base stations. The advantage of the present invention is that it does not need to carry out signaling interaction between base stations to realize the transmission of load resources, and completes the transmission of load information of adjacent cells at a small cost.
Description
技术领域technical field
本发明涉及移动通信技术领域,其特别涉及无线演进网络中基站间的无线资源管理,具体的讲是一种演进网络中无线资源管理信息获取方法及系统。The present invention relates to the technical field of mobile communication, in particular to wireless resource management between base stations in a wireless evolution network, and specifically to a method and system for acquiring wireless resource management information in an evolution network.
背景技术Background technique
通用移动通信系统(UMTS)是采用WCDMA空中接口技术的第三代移动通信系统,通常也把UMTS系统称为WCDMA通信系统。UMTS系统采用了与第二代移动通信系统类似的结构,包括无线接入网络(RAN)和核心网络(CN)。其中RAN用于处理所有与无线有关的功能,而CN处理UMTS系统内所有的话音呼叫和数据连接,并实现与外部网络的交换和路由功能。CN从逻辑上分为电路交换域(CS)和分组交换域(PS)。UMTS陆地无线接入网(UTRAN)、CN与用户设备(UE)一起构成了整个UMTS系统。其系统结构如图1所示。The Universal Mobile Telecommunications System (UMTS) is a third-generation mobile communication system using WCDMA air interface technology, and the UMTS system is usually called a WCDMA communication system. The UMTS system adopts a structure similar to that of the second generation mobile communication system, including a radio access network (RAN) and a core network (CN). Among them, RAN is used to handle all wireless-related functions, while CN handles all voice calls and data connections in the UMTS system, and realizes switching and routing functions with external networks. CN is logically divided into circuit switched domain (CS) and packet switched domain (PS). UMTS Terrestrial Radio Access Network (UTRAN), CN and User Equipment (UE) together constitute the entire UMTS system. Its system structure is shown in Fig. 1.
在图1中,UTRAN包含一个或几个无线网络子系统(RNS),每个RNS由一个无线网络控制器(RNC)和一个或多个基站(NodeB)组成。RNC与CN之间的接口是Iu接口,NodeB和RNC通过Iub接口连接。在UTRAN内部,RNC之间通过Iur接口互联,Iur接口可以通过RNC之间的直接物理连接或通过传输网连接。RNC用来分配和控制与之相连或相关的NodeB的无线资源。NodeB则完成Iub接口和Uu接口之间的数据流的转换,同时也参与一部分无线资源管理(RRM)。UTRAN的结构如图2所示。In Fig. 1, UTRAN includes one or several radio network subsystems (RNS), and each RNS is composed of a radio network controller (RNC) and one or more base stations (NodeB). The interface between the RNC and the CN is the Iu interface, and the NodeB and the RNC are connected through the Iub interface. In the UTRAN, RNCs are interconnected through the Iur interface, and the Iur interface can be connected through a direct physical connection between RNCs or through a transmission network. The RNC is used to allocate and control the wireless resources of the NodeB connected or related to it. The NodeB completes the conversion of the data flow between the Iub interface and the Uu interface, and also participates in a part of radio resource management (RRM). The structure of UTRAN is shown in Figure 2.
在图2中,NodeB是WCDMA系统的基站(即无线收发信机),包括无线收发信机和基带处理部件。通过标准的Iub接口和RNC互连,主要完成Uu接口物理层协议的处理。它的主要功能是扩频、调制、信道编码及解扩、解调、信道解码,还包括基带信号和射频信号的相互转换等功能。In Fig. 2, NodeB is a base station (that is, a wireless transceiver) of a WCDMA system, including a wireless transceiver and baseband processing components. Through the standard Iub interface and RNC interconnection, it mainly completes the processing of the Uu interface physical layer protocol. Its main functions are spread spectrum, modulation, channel coding and despreading, demodulation, channel decoding, and also include functions such as mutual conversion of baseband signals and radio frequency signals.
RNC用于控制UTRAN的无线资源,主要完成连接建立和断开、切换、宏分集合并、无线资源管理控制等功能。The RNC is used to control the radio resources of the UTRAN, and mainly completes functions such as connection establishment and disconnection, handover, macro-diversity combination, and radio resource management and control.
以上的网络架构是基于3GPP Rel6以前版本的架构,考虑到未来网络的竞争能力,3GPP正在研究一种全新的演进网络架构以满足未来十年甚至更长时间内移动网络的应用需求,包括系统架构演进(SAE)和接入网的长期演进(LTE),其中演进的接入网称为E-UTRAN。网络演进的目标是希望提供一种低时延、高数据速率、高系统容量和覆盖、低成本、完全基于IP的网络。由于是一种全新的网络架构,因此现有架构的所有节点、功能和流程都将发生实质性的变化。The above network architecture is based on the architecture of previous versions of 3GPP Rel6. Considering the competitiveness of future networks, 3GPP is studying a new evolved network architecture to meet the application requirements of mobile networks in the next ten years or even longer, including system architecture. Evolution (SAE) and Long Term Evolution (LTE) of the access network, where the evolved access network is called E-UTRAN. The goal of network evolution is to provide a low-latency, high data rate, high system capacity and coverage, low-cost, completely IP-based network. Since it is a brand new network architecture, all nodes, functions and processes of the existing architecture will undergo substantial changes.
在演进网络中,接入网络部分的架构由3G网络的NodeB和RNC的两节点结构演进为只有一个节点eNodeB的单节点架构。在演进网络的研究中,RAN的RRM功能的设计是一个重要的课题,尤其是考虑到不同eNodeB之间的RRM功能,如移动切换管理、负载均衡等。目前针对这一课题所达成RRM的架构如图3所示。In the evolved network, the architecture of the access network part evolves from the two-node structure of NodeB and RNC in the 3G network to a single-node architecture with only one node eNodeB. In the research of evolving network, the design of RRM function of RAN is an important topic, especially considering the RRM function between different eNodeBs, such as mobile handover management, load balancing, etc. Figure 3 shows the architecture of RRM currently achieved for this topic.
在图3中,E1为UE与网络侧的空中接口;E2为逻辑接口,实际上E2由E1与E3组成;E3为eNodeB与具有不同eNodeB之间RRM功能的中心节点(eCRNC)之间的接口;E4是eNodeB与核心网节点的用户面接口;E5类似现有的Iu接口,是接入网络和核心网络之间的接口;E6是移动管理实体/用户面实体(MME/UPE)与移动锚点之间的控制面和用户面接口;E7提供eNodeB和网管模块之间的接口。In Figure 3, E1 is the air interface between the UE and the network side; E2 is the logical interface, actually E2 is composed of E1 and E3; E3 is the interface between the eNodeB and the central node (eCRNC) with the RRM function between different eNodeBs ; E4 is the user plane interface between eNodeB and core network nodes; E5 is similar to the existing Iu interface, and is the interface between the access network and the core network; E6 is the mobility management entity/user plane entity (MME/UPE) and mobility anchor The interface between the control plane and the user plane between nodes; E7 provides the interface between the eNodeB and the network management module.
在这种架构下,RRM功能主要在eNodeB完成,而其他如不同eNodeB间的RRM功能则主要由eCRNC完成。Under this architecture, the RRM function is mainly completed by the eNodeB, while other functions such as RRM between different eNodeBs are mainly completed by the eCRNC.
在进行不同eNodeB间的RRM功能时,需要获取相邻eNodeB的RRM信息,该架构中的RRM信息的获取是通过E3接口完成,即由各个eNodeB向eCRNC提供本地的RRM信息,eCRNC负责收集这些RRM信息,并基于这些信息完成相应的eNodeB间的RRM功能。When performing the RRM function between different eNodeBs, it is necessary to obtain the RRM information of adjacent eNodeBs. The acquisition of RRM information in this architecture is completed through the E3 interface, that is, each eNodeB provides local RRM information to eCRNC, and eCRNC is responsible for collecting these RRMs. information, and complete the corresponding RRM function between eNodeBs based on the information.
上述现有技术的缺陷在于:没有给出有效的获取相邻小区负载资源状况的方案,相邻小区的负载资源状况以及其他信息的获取是通过eCRNC和eNodeB之间的接口完成。该过程会带来网元间信令的负荷,并且很难确定获取信息的频繁程度。The defect of the above-mentioned prior art is that no effective solution for obtaining the load resource status of adjacent cells is provided, and the load resource status and other information of adjacent cells are acquired through the interface between eCRNC and eNodeB. This process will bring signaling load between network elements, and it is difficult to determine the frequency of information acquisition.
发明内容Contents of the invention
本发明的目的在于,提供一种演进网络中无线资源管理信息获取方法及系统,用以解决在eNodeB之间获取RRM信息的问题。The object of the present invention is to provide a method and system for acquiring radio resource management information in an evolved network, so as to solve the problem of acquiring RRM information between eNodeBs.
本发明的技术方案为:一种演进网络中无线资源管理信息获取方法,其中,由用户设备获取相邻小区无线资源管理信息,并将获取的相邻小区无线资源管理信息发送给本小区基站进行处理。The technical solution of the present invention is: a method for acquiring radio resource management information in an evolved network, wherein the user equipment acquires the radio resource management information of the adjacent cell, and sends the acquired radio resource management information of the adjacent cell to the base station of the local cell for further processing. deal with.
本发明所述的方法包括以下步骤:相邻小区在下行信道中包含该小区的无线资源管理信息;用户设备对本小区下行信道状况信息和相邻小区下行信道状况信息进行测量,并获取相邻小区无线资源管理信息;所述的用户设备将获取的相邻小区无线资源管理信息,连同自身所测量的本小区下行信道状况信息和相邻小区下行信道状况信息一起发送到本小区基站进行处理。The method of the present invention includes the following steps: the downlink channel of the adjacent cell includes the radio resource management information of the cell; the user equipment measures the downlink channel status information of the current cell and the downlink channel status information of the adjacent cell, and obtains the adjacent cell Radio resource management information: the user equipment sends the acquired radio resource management information of the adjacent cell, together with the downlink channel status information of the own cell measured by itself and the downlink channel status information of the adjacent cell, to the base station of the current cell for processing.
所述的将获取的相邻小区无线资源管理信息发送给本小区基站进行处理包括:所述的用户设备对获取的相邻小区无线资源管理信息进行解析,得到相邻小区资源信息,并将相邻小区资源变化指示发送给本小区基站;所述的本小区基站判断是否发送相邻小区资源信息请求指示,如果是,则向所述的用户设备发送所述的相邻小区资源信息请求指示;所述的用户设备接收到所述的相邻小区资源信息请求指示后,向所述的本小区基站发送所述的相邻小区资源信息。The sending the acquired radio resource management information of the neighboring cell to the base station of the local cell for processing includes: the user equipment analyzes the acquired radio resource management information of the neighboring cell to obtain the resource information of the neighboring cell, and sends the corresponding The neighbor cell resource change indication is sent to the base station of the local cell; the base station of the local cell judges whether to send the neighbor cell resource information request indication, and if so, sends the neighbor cell resource information request indication to the user equipment; The user equipment sends the adjacent cell resource information to the local cell base station after receiving the adjacent cell resource information request indication.
所述的本小区基站判断是否发送相邻小区资源信息请求指示包括:所述的用户设备将相邻小区资源变化指示发送给本小区基站;所述的本小区基站根据接收到的相邻小区资源变化指示判断是否发送相邻小区资源信息请求指示。The base station of the local cell judging whether to send the resource information request indication of the adjacent cell includes: the user equipment sends the resource change indication of the adjacent cell to the base station of the local cell; The change indication judges whether to send the resource information request indication of the adjacent cell.
本小区基站根据接收到的相邻小区资源变化指示,得到上报相邻小区资源变化指示的用户设备与相邻小区资源变化指示所对应相邻小区之间的映射关系;本小区基站根据所述的映射关系,向选择的用户设备发送所述的相邻小区资源信息请求指示。The base station of this cell obtains the mapping relationship between the user equipment reporting the resource change indication of the adjacent cell and the adjacent cell corresponding to the resource change indication of the adjacent cell according to the received neighbor cell resource change indication; the base station of the current cell according to the The mapping relationship, sending the neighbor cell resource information request indication to the selected user equipment.
本小区基站在所述的映射关系中选择上报相邻小区负载变化指示最多的用户设备,并向该用户设备发送相邻小区资源信息请求消息,同时删除该用户设备在映射关系中的映射;之后本小区基站在所述的映射关系中选择剩下的上报相邻小区资源变化指示最多的用户设备,并向该用户设备发送相邻小区资源信息请求消息,同时删除该用户设备在映射关系中的映射,直到所述的映射关系中所有的映射被删除完毕。The base station of this cell selects the user equipment that reports the most load change indications of adjacent cells in the mapping relationship, and sends a resource information request message of the adjacent cell to the user equipment, and deletes the mapping of the user equipment in the mapping relationship at the same time; The base station of this cell selects the remaining user equipment that reports the most adjacent cell resource change indications in the mapping relationship, and sends a neighboring cell resource information request message to the user equipment, and deletes the user equipment in the mapping relationship mapping until all the mappings in the mapping relationship are deleted.
所述的本小区基站判断是否发送相邻小区资源信息请求指示包括:当本小区基站发现本小区资源达到一定域值需要做负载均衡的时候,主动发送所述的相邻小区资源负载信息请求指示。The base station of the local cell judging whether to send the resource information request indication of the adjacent cell includes: when the base station of the local cell finds that the resources of the local cell reach a certain threshold and needs to be load balanced, actively sending the resource load information request indication of the adjacent cell .
当用户设备通过测量发现相邻小区的信号好于本小区的信号时,主动向本小区基站发送信号好的相邻小区的负载信息,而不用等待所述本小区基站发出的相邻小区资源负载信息请求指示。When the user equipment finds that the signal of the neighboring cell is better than the signal of the local cell through measurement, it actively sends the load information of the neighboring cell with good signal to the base station of the local cell, without waiting for the resource load of the neighboring cell sent by the base station of the local cell Information Request Instructions.
所述的资源信息包括:资源负载信息、无线资源分配信息、无线资源的可用状态。The resource information includes: resource load information, wireless resource allocation information, and available status of wireless resources.
本发明还提供了一种演进网络中无线资源管理信息获取方法,其中包括以下步骤:相邻小区基站连续的发送下行帧,所述下行帧中包含量化后的相邻小区负载信息;用户设备解析所述的相邻小区负载信息,得出量化后的相邻小区负载信息;所述的用户设备向本小区基站发送相邻小区负载信息。The present invention also provides a method for acquiring radio resource management information in an evolved network, which includes the following steps: the base station of an adjacent cell continuously sends downlink frames, and the downlink frame contains quantized load information of adjacent cells; the user equipment parses The load information of the adjacent cell is obtained by obtaining the quantized load information of the adjacent cell; the user equipment sends the load information of the adjacent cell to the base station of the local cell.
所述的下行帧通过相互正交的伪随机序列来区分不同小区的信号,并通过初始相位偏移来携带相邻小区负载信息。The downlink frame distinguishes signals of different cells through mutually orthogonal pseudo-random sequences, and carries load information of adjacent cells through an initial phase offset.
所述下行帧的头部包括:主前导码,是调制在子载波上的伪随机序列,用于小区的同步;辅前导码,是调制在子载波上的一组互相正交的伪随机序列,用于帧定时、区分小区ID、初始信道估计和测量,并且不同小区所使用的辅前导码序列相互正交;广播信息,用于提供小区广播以及每帧的资源分配映射表。The header of the downlink frame includes: a primary preamble, which is a pseudo-random sequence modulated on subcarriers, and is used for cell synchronization; a secondary preamble, which is a group of mutually orthogonal pseudorandom sequences modulated on subcarriers , used for frame timing, cell ID distinction, initial channel estimation and measurement, and secondary preamble sequences used by different cells are orthogonal to each other; broadcast information, used to provide cell broadcast and resource allocation mapping table for each frame.
所述的下行帧通过选取一组相互正交的码,分为若干个不相交的子集,为每个相邻小区分配不同的子集,每个子集内的一个码表示一种负载信息状态,所述的用户设备通过收到的码获得相邻小区负载信息。The downlink frame is divided into several disjoint subsets by selecting a group of mutually orthogonal codes, and a different subset is allocated to each adjacent cell, and a code in each subset represents a load information state , the user equipment obtains the neighbor cell load information through the received code.
所述的用户设备根据相关峰值确定能够使用的多个相邻小区的下行信息,然后根据相关峰值的相位得出所述多个相邻小区的量化后的相邻小区负载信息。The user equipment determines the available downlink information of multiple adjacent cells according to the correlation peak value, and then obtains the quantized adjacent cell load information of the multiple adjacent cells according to the phase of the correlation peak value.
当采用长度为2N的伪随机序列时,相位量化的值为N;用户设备在检测到相位偏移后,量化值的前N/2作为判断是否发生负载变化的依据。When a pseudo-random sequence with a length of 2 N is used, the phase quantization value is N; after the user equipment detects the phase offset, the first N/2 of the quantization value is used as a basis for judging whether a load change occurs.
所述的用户设备做如下判断:如果解析出的每个相邻小区的N比特量化值的前N/2比特都不变,则认为该相邻小区的负载没有变化,否则认为该相邻小区的负载发生变化;所述的用户设备周期性的向本小区基站发送测量报告,测量报告中包含相邻小区负载变化指示信息;本小区基站收到各个用户设备发送来的测量报告,分析其中的相邻小区负载变化指示,并根据分析结果向相应的用户设备发送相邻小区资源负载信息请求指示信息;用户设备收到所述的相邻小区资源负载信息请求指示信息后,在下一个上报的测量报告中包含相邻小区负载信息。The user equipment makes the following judgment: if the first N/2 bits of the N-bit quantized value of each neighboring cell analyzed are unchanged, it is considered that the load of the neighboring cell has not changed; otherwise, the load of the neighboring cell is considered to be The load of the user equipment changes; the user equipment periodically sends a measurement report to the base station of the cell, and the measurement report includes load change indication information of the adjacent cell; the base station of the cell receives the measurement report sent by each user equipment, and analyzes the Neighboring cell load change indication, and according to the analysis result, send the adjacent cell resource load information request indication information to the corresponding user equipment; after the user equipment receives the adjacent cell resource load information request indication information, the next reported measurement The report contains neighbor cell load information.
本发明还提供了一种演进网络中无线资源管理信息获取系统,包括:用户设备、本小区基站、相邻小区基站;所述的用户设备具有无线资源管理信息收发装置;所述的无线资源管理信息收发装置,用于从所述的相邻小区基站获取相邻小区无线资源管理信息,并将获取的相邻小区无线资源管理信息发送给所述的本小区基站。The present invention also provides a radio resource management information acquisition system in an evolved network, including: user equipment, a base station in a local cell, and a base station in an adjacent cell; the user equipment has a radio resource management information sending and receiving device; the radio resource management The information transceiving device is used to obtain the radio resource management information of the neighboring cell from the base station of the neighboring cell, and send the obtained radio resource management information of the neighboring cell to the base station of the local cell.
所述的用户设备还包括:资源信息解析装置;所述的资源信息解析装置,用于对获取的相邻小区无线资源管理信息进行解析,得到相邻小区资源信息和相邻小区资源变化指示信息,并将所述的相邻小区资源变化指示信息通过所述的无线资源管理信息收发装置发送给所述的本小区基站;所述的本小区基站具有资源信息请求指示发送装置;所述的资源信息请求指示发送装置,用于判断是否发送相邻小区资源信息请求指示,如果是,则向所述的用户设备发送所述的相邻小区资源信息请求指示;所述的用户设备接收到所述的相邻小区资源信息请求指示后,将所述的资源信息解析装置得到的相邻小区资源信息通过所述的无线资源管理信息收发装置向所述的本小区基站发送。The user equipment further includes: a resource information parsing device; the resource information parsing device is configured to parse the obtained adjacent cell radio resource management information to obtain adjacent cell resource information and adjacent cell resource change indication information , and send the adjacent cell resource change instruction information to the base station of the local cell through the radio resource management information sending and receiving device; the base station of the local cell has a resource information request instruction sending device; the resource An information request indication sending device, configured to determine whether to send an adjacent cell resource information request indication, and if so, send the adjacent cell resource information request indication to the user equipment; the user equipment receives the After the neighbor cell resource information request instruction, the neighbor cell resource information obtained by the resource information analyzing device is sent to the base station of the local cell through the radio resource management information sending and receiving device.
所述的相邻小区资源信息包括:相邻小区资源负载信息、相邻小区无线资源分配信息、相邻小区无线资源的可用状态。The adjacent cell resource information includes: adjacent cell resource load information, adjacent cell radio resource allocation information, and availability status of adjacent cell radio resources.
本发明的有益效果在于,给出了一种通过UE参与来获取邻小区资源信息的方案。该方案不需要在基站之间进行信令交互实现资源负载信息的传输,以很小的代价完成了相邻小区资源信息的传送。The beneficial effect of the present invention is that it provides a scheme for acquiring resource information of neighboring cells through UE participation. This solution does not need to perform signaling interaction between base stations to realize the transmission of resource load information, and completes the transmission of resource information of adjacent cells at a small cost.
附图说明Description of drawings
图1为UMTS系统结构框图;Figure 1 is a block diagram of the UMTS system structure;
图2为UTRAN的结构框图;Fig. 2 is a structural block diagram of UTRAN;
图3为现有技术的RRM功能架构分布图;FIG. 3 is a distribution diagram of an RRM functional architecture in the prior art;
图4为本发明方案的过程框图;Fig. 4 is the process block diagram of scheme of the present invention;
图5为本发明的下行OFDMA数据帧格式图;Fig. 5 is a downlink OFDMA data frame format diagram of the present invention;
图6为本发明中本小区接收相邻小区资源负载信息的消息流程图;Fig. 6 is the message flow diagram of this cell receiving adjacent cell resource load information in the present invention;
图7为本发明的上报相邻小区负载变化指示的用户设备与相邻小区负载变化指示所对应相邻小区之间的映射关系图;FIG. 7 is a map of the mapping relationship between the user equipment reporting the load change indication of the adjacent cell and the adjacent cell corresponding to the load change indication of the adjacent cell according to the present invention;
图8为本发明系统的结构框图。Fig. 8 is a structural block diagram of the system of the present invention.
具体实施方式Detailed ways
以下结合附图说明本发明的具体实施方式。本发明给出一种在演进网络中由终端UE获取相邻小区的相应RRM信息,并提供给本小区基站(eNodeB)的方案,解决在eNodeB之间获取RRM信息的问题。为了实现小区之间的无线资源管理功能,基站需要了解相邻小区的无线资源状况。本发明方法过程如图4所示,其中,RRM信息的基本获取过程为:相邻基站将邻小区的资源信息(包括:资源负载信息、无线资源分配信息、无线资源的可用状态)包含在下行帧中;终端解析该资源信息,并连同自身所测量的本小区下行信道状况和邻小区下行信道状况一起发送到本小区基站;本小区基站根据这些信息以及自身所获得本小区负载信息、本小区资源分配情况以及UE的上行信道状况从事相应的RRM功能。The specific embodiments of the present invention will be described below in conjunction with the accompanying drawings. The present invention provides a scheme in which a terminal UE obtains corresponding RRM information of adjacent cells in an evolved network and provides it to a base station (eNodeB) of the cell, so as to solve the problem of obtaining RRM information between eNodeBs. In order to implement the radio resource management function between cells, the base station needs to know the radio resource status of adjacent cells. The method process of the present invention is shown in Figure 4, wherein the basic acquisition process of RRM information is: the adjacent base station includes the resource information (including: resource load information, wireless resource allocation information, and available status of wireless resources) of the adjacent cell in the downlink frame; the terminal analyzes the resource information, and sends it to the base station of the cell together with the downlink channel conditions of the own cell and the downlink channel conditions of the neighboring cells measured by itself; The resource allocation situation and the uplink channel status of the UE are engaged in the corresponding RRM function.
实施例1Example 1
在演进网络中,eNodeB的下行传输采用OFDM调制,数据的传输以帧为单位进行,其多址方式采用的是OFDMA/TDMA。为了能够进行有效的小区间干扰管理,演进网络中不同小区间在时间上严格同步。本发明给出的携带小区负载信息的下行OFDMA数据帧格式如图5所示。In the evolved network, the downlink transmission of the eNodeB adopts OFDM modulation, the data transmission is carried out in units of frames, and the multiple access method adopts OFDMA/TDMA. In order to perform effective inter-cell interference management, different cells in the evolved network are strictly synchronized in time. The format of the downlink OFDMA data frame carrying cell load information provided by the present invention is shown in FIG. 5 .
本发明的下行数据帧格式在每一帧的开头有三个部分:主前导码、辅前导码、广播信息。对这三个部分分别描述如下:The downlink data frame format of the present invention has three parts at the beginning of each frame: main preamble, secondary preamble and broadcast information. The three parts are described as follows:
主前导码:是调制在子载波上的伪随机序列,主要用于小区的同步。为了保证快速的小区同步,所有小区都采用相同的序列。主前导码一般只占用1个OFDM符号。Primary preamble: It is a pseudo-random sequence modulated on subcarriers, mainly used for cell synchronization. In order to ensure fast cell synchronization, all cells use the same sequence. The main preamble generally only occupies one OFDM symbol.
辅前导码:是调制在子载波上的一组互相正交的伪随机序列,主要用于帧定时、区分小区ID、初始信道估计和测量等功能,不同小区所使用的辅前导码序列相互正交,从而可以让终端区分不同的小区。每个小区的辅前导码的初始相位与该小区的当前负载相关,终端在通过主前导码同步的基础上,可以通过检测接收到的各个小区辅前导码序列的初始相位来获取各小区的负载信息。长度为256的辅前导码序列可以表示8比特量化的小区负载信息。辅前导码一般只占用1个OFDM符号。Secondary preamble: It is a group of mutually orthogonal pseudo-random sequences modulated on subcarriers, mainly used for frame timing, distinguishing cell ID, initial channel estimation and measurement, etc. The secondary preamble sequences used by different cells are mutually positive Intersection, so that the terminal can distinguish different cells. The initial phase of the secondary preamble of each cell is related to the current load of the cell. On the basis of synchronization through the primary preamble, the terminal can obtain the load of each cell by detecting the initial phase of the received secondary preamble sequence of each cell information. The secondary preamble sequence with a length of 256 can represent 8-bit quantized cell load information. The secondary preamble generally only occupies one OFDM symbol.
广播信息:用来提供小区广播以及每帧的资源分配映射表,以便终端可以正确的解出属于自己的数据。为了保证小区边缘的终端对本小区广播的接收,这部分数据将采用较高增益的编码,并采用与特定小区相关的PN序列加扰。Broadcast information: used to provide cell broadcast and resource allocation mapping table for each frame, so that the terminal can correctly decode its own data. In order to ensure that the terminals at the edge of the cell can receive the broadcast of the cell, this part of the data will be coded with a higher gain and scrambled with the PN sequence related to the specific cell.
上述数据帧格式的主要目的是要让终端进行小区测量工作的同时可以获得小区的负载信息,不需要增加额外的复杂度。终端利用本地已经固化的一组相互正交的伪随机序列去和接收到的辅前导码做相关运算,通过每一个序列计算出的相关峰的峰值进行对应的信道测量,通过相关峰的相位获取对应小区的负载信息。The main purpose of the above data frame format is to enable the terminal to obtain the load information of the cell while performing the cell measurement work, without adding additional complexity. The terminal uses a set of mutually orthogonal pseudo-random sequences that have been solidified locally to perform correlation calculations with the received secondary preamble, and performs corresponding channel measurement through the peak value of the correlation peak calculated by each sequence, and obtains the corresponding channel through the phase of the correlation peak Corresponding to the load information of the cell.
终端在解析出基站发出的小区负载信息后,在向基站发送的测量报告里附上负载是否改变的指示,该指示只占用1比特,该比特可以和CQI联合发送,在基站的物理层收到该信息后,通过物理层和上层之间的原语将该信息发送到上层;上层根据收到的多个终端的指示,决定向哪些终端请求邻小区负载信息,终端在收到基站发来的请求信息后,再将负载信息发送给基站。After analyzing the cell load information sent by the base station, the terminal attaches an indication of whether the load has changed in the measurement report sent to the base station. The indication only occupies 1 bit, which can be sent jointly with the CQI and received at the physical layer of the base station. After receiving the information, the information is sent to the upper layer through the primitives between the physical layer and the upper layer; the upper layer decides which terminals to request the load information of adjacent cells according to the instructions received from multiple terminals, and the terminal receives the information sent by the base station After requesting the information, the load information is sent to the base station.
上述过程中,1比特的负载变化指示在每一个上报的测量报告里都存在,而真正的邻小区负载信息则只有在收到基站的请求时才发送。In the above process, a 1-bit load change indication exists in every reported measurement report, and the real load information of adjacent cells is sent only when a request from the base station is received.
具体的消息流程如图6所示。在图6中:The specific message flow is shown in FIG. 6 . In Figure 6:
(1)本小区和邻小区的基站连续的发送下行帧,下行帧中包含量化后的该小区的负载信息;(1) The base stations of the current cell and the neighboring cell continuously transmit downlink frames, and the downlink frames contain the quantized load information of the cell;
(2)终端解析各个小区的负载信息,首先根据相关峰值确定可以使用的几个小区的下行信息,然后根据相关峰的相位得出这几个小区的量化负载信息,并做下如下判断:如果解析出的每个小区的N比特量化值的前N/2比特都不变,则认为负载没有变化,负载变化指示为0,否则认为负载发生变化,负载变化指示为1;(2) The terminal analyzes the load information of each cell, first determines the downlink information of several cells that can be used according to the correlation peak, and then obtains the quantized load information of these cells according to the phase of the correlation peak, and makes the following judgment: if If the first N/2 bits of the N-bit quantized value of each cell analyzed are unchanged, it is considered that the load has not changed, and the load change indicator is 0; otherwise, the load is considered to have changed, and the load change indicator is 1;
(3)终端周期性的向本小区的基站发送测量报告,测量报告中包含当前的负载变化指示;(3) The terminal periodically sends a measurement report to the base station of the cell, and the measurement report includes the current load change indication;
(4)本小区基站收到各个终端发送过来的测量报告,分析其中的负载变化指示,并根据分析结果向相应的终端发送邻小区负载信息请求消息;(4) The base station of the local cell receives the measurement report sent by each terminal, analyzes the load change indication therein, and sends a neighbor cell load information request message to the corresponding terminal according to the analysis result;
(5)终端收到负载信息请求消息后,在下一个上报的测量报告中包含邻小区负载信息。(5) After receiving the load information request message, the terminal includes the neighbor cell load information in the next measurement report to be reported.
上述过程的(2)和小区负载的量化过程相关。小区负载的量化希望尽量精确,但也受到两个因素制约,即:(2) of the above process is related to the quantification process of cell load. The quantification of cell load is expected to be as accurate as possible, but it is also restricted by two factors, namely:
相位偏移分辨能力:由于不同基站的信号存在路径延时和多径效应,对于长度为2N的序列,其相位分辨能力低于1/2N,因此其实际有效的量化位数会小于N;Phase offset resolution ability: due to the path delay and multipath effect of signals from different base stations, for a sequence with a length of 2N, its phase resolution ability is lower than 1/2N, so its actual effective quantization bits will be less than N;
终端上报小区负载信息的频度:量化的位数越高,终端上报负载变化指示为1的情况就越频繁,负载上报的流程的频度也越大,因此量化位数不能过大。Frequency of reporting cell load information by the terminal: The higher the number of quantization bits, the more frequently the terminal will report the load change indicator as 1, and the frequency of the load reporting process will be greater, so the number of quantization bits should not be too large.
为此,本发明选择在采用长度为2N的序列的情况下,相位量化的值就定为N,终端在检测到相位偏移后,量化值的前N/2作为判断是否发生负载变化的依据,而量化值的后N/2只是作为参考值,在基站接收后进行相应处理时以较低的权值参与运算。For this reason, the present invention chooses that in the case of using a sequence with a length of 2N, the phase quantization value is set to N, and after the terminal detects the phase offset, the first N/2 of the quantization value is used as the basis for judging whether a load change occurs , and the last N/2 of the quantized value is only used as a reference value, and participates in the calculation with a lower weight when the base station performs corresponding processing after receiving it.
上述过程的(4)中,负载变化指示的分析过程如下:In (4) of the above process, the analysis process of the load change indication is as follows:
本小区基站根据接收到的负载变化指示得出如图7所示的映射关系。其中,左边一列为上报的负载变化指示值等于1的终端701,按照其所接收到信号的邻小区的个数进行排序;右边一列为这些指示所对应的小区702,中间的连接线703表示终端上报的负载变化指示和相应小区之间的对应关系。本小区基站根据该映射关系,首先选择连接线最多的UE,向其发送邻小区负载信息请求消息,同时删除对应的连接线;之后再在剩下的映射关系中选择连接线最多的UE,向其发送邻小区负载信息请求消息,同时删除对应的连接线,直到所有的连接线被删除完毕。The base station of the cell obtains the mapping relationship shown in FIG. 7 according to the received load change indication. Among them, the left column is the terminal 701 whose reported load change indicator value is equal to 1, sorted according to the number of neighboring cells that it receives the signal; the right column is the
当本小区基站发现本小区负载过重,达到一定域值需要做负载均衡的时候,即使没有收到负载变化指示值为1的消息,也会主动发送邻小区负载信息请求信令,请求UE上报邻小区负载信息。此时基站选择发送信令的目标UE的方式和前面描述的过程相同,只是假定所有UE的负载变化指示值都为1。When the base station of this cell finds that the load of the cell is too heavy and needs to be load balanced when it reaches a certain threshold, even if it does not receive the message that the load change indicator value is 1, it will actively send the neighbor cell load information request signaling to request the UE to report Neighboring cell load information. At this time, the manner in which the base station selects the target UE for signaling is the same as the process described above, except that the load change indication values of all UEs are assumed to be 1.
当UE通过测量发现本小区的信号较差、邻小区的信号较好,可能会发生切换时,也会主动向基站发送信号较好的邻小区的负载信息,而不用等到收到基站发出的邻小区负载信息请求信令。UE主动发送的负载信息有两种格式:一种是前面所述的具体量化值,一种是根据所测的负载量化值先做一个是否准入的判断,然后将是否准入的判断值(1比特)作为负载信息上报给基站。其中,第二种方法可以减少空口数据量,但要求UE有一定的准入判断能力,并要和基站的准入算法相一致。When the UE finds that the signal of the local cell is poor and the signal of the neighboring cell is good through measurement, and handover may occur, it will also actively send the load information of the neighboring cell with better signal to the base station without waiting for the neighbor cell from the base station. Cell load information request signaling. The load information actively sent by the UE has two formats: one is the specific quantitative value mentioned above, and the other is to make a judgment on whether to admit or not based on the measured load quantized value, and then use the judgment value ( 1 bit) is reported to the base station as load information. Among them, the second method can reduce the amount of air interface data, but requires the UE to have a certain admission judgment ability, and must be consistent with the admission algorithm of the base station.
实施例2Example 2
本小区和邻小区的基站连续的发送下行帧,下行帧中包含量化后的该小区的负载信息;为了避免路径的传输延时导致的PN序列相位不准确的问题,可以考虑不用初始相位来表示负载信息,而是选取一组相互正交的码,分为若干个不相交的子集,为每个小区分配不同的子集,每个子集内的一个码表示一种负载信息状态,这样终端只需要知道收到的码就能够获得负载信息。The base stations of the local cell and neighboring cells continuously send downlink frames, which contain the quantized load information of the cell; in order to avoid the problem of inaccurate PN sequence phases caused by path transmission delays, it may be considered not to represent the initial phase Instead, select a group of mutually orthogonal codes, divide them into several disjoint subsets, assign different subsets to each cell, and a code in each subset represents a state of load information, so that the terminal The load information can be obtained only by knowing the received code.
终端解析各个小区的负载信息,首先根据相关峰值确定可以使用的几个小区的下行信息,然后根据相关峰的相位得出这几个小区的量化负载信息,并做下如下判断:如果解析出的每个小区的N比特量化值的前N/2比特都不变,则认为负载没有变化,负载变化指示为0,否则认为负载发生变化,负载变化指示为1;The terminal analyzes the load information of each cell, first determines the downlink information of several cells that can be used according to the correlation peak, and then obtains the quantized load information of these cells according to the phase of the correlation peak, and makes the following judgment: If the analyzed If the first N/2 bits of the N-bit quantization value of each cell are unchanged, it is considered that the load has not changed, and the load change indicator is 0, otherwise it is considered that the load has changed, and the load change indicator is 1;
终端周期性的向本小区的基站发送测量报告,测量报告中包含当前的负载变化指示;The terminal periodically sends a measurement report to the base station of the cell, and the measurement report contains the current load change indication;
本小区基站收到各个终端发送过来的测量报告,分析其中的负载变化指示,并根据分析结果向相应的终端发送邻小区负载信息请求消息;The base station of this cell receives the measurement report sent by each terminal, analyzes the load change indication in it, and sends a neighbor cell load information request message to the corresponding terminal according to the analysis result;
终端收到负载信息请求消息后,在下一个上报的测量报告中包含邻小区负载信息。After receiving the load information request message, the terminal includes the neighbor cell load information in the next measurement report to be reported.
实施例3Example 3
如图8所示,本发明还提供了一种演进网络中无线资源管理信息获取系统,包括:用户设备(UE)、本小区基站、相邻小区基站;所述的用户设备具有无线资源管理信息收发装置;其中:所述的无线资源管理信息包括相邻小区资源信息,该相邻小区资源信息包括:相邻小区资源负载信息、相邻小区无线资源分配信息、相邻小区无线资源的可用状态,下面以相邻小区资源负载信息为例进行说明:As shown in FIG. 8 , the present invention also provides a system for acquiring radio resource management information in an evolved network, including: user equipment (UE), a base station in a local cell, and a base station in a neighboring cell; the user equipment has radio resource management information A transceiver device; wherein: the wireless resource management information includes adjacent cell resource information, and the adjacent cell resource information includes: adjacent cell resource load information, adjacent cell wireless resource allocation information, and availability status of adjacent cell wireless resources , the following takes the resource load information of adjacent cells as an example to illustrate:
(1′)本小区和相邻小区的基站连续的发送下行帧,下行帧中包含量化后的该小区的资源负载信息;(1') The base stations of the current cell and the neighboring cell continuously transmit downlink frames, and the downlink frames include quantized resource load information of the cell;
(2′)终端的资源负载信息解析装置解析各个小区的资源负载信息,首先根据相关峰值确定可以使用的几个小区的下行信息,然后根据相关峰的相位得出这几个小区的量化资源负载信息,并做下如下判断:如果解析出的每个小区的N比特量化值的前N/2比特都不变,则认为负载没有变化,负载变化指示为0,否则认为负载发生变化,负载变化指示为1;(2') The resource load information analysis device of the terminal analyzes the resource load information of each cell, first determines the downlink information of several cells that can be used according to the correlation peak, and then obtains the quantized resource load of these cells according to the phase of the correlation peak information, and make the following judgment: if the first N/2 bits of the N-bit quantization value of each cell analyzed are unchanged, it is considered that the load has not changed, and the load change indicator is 0; otherwise, it is considered that the load has changed, and the load has changed indicates 1;
(3′)终端的无线资源管理信息收发装置周期性的向本小区的基站发送测量报告,测量报告中包含当前的负载变化指示;(3') The radio resource management information transceiver device of the terminal periodically sends a measurement report to the base station of the cell, and the measurement report includes the current load change indication;
(4′)本小区基站收到各个终端发送过来的测量报告后,由资源负载信息请求指示发送装置分析其中的负载变化指示,并根据分析结果向相应的终端发送邻小区资源负载信息请求消息;(4') After the base station of the local cell receives the measurement report sent by each terminal, the resource load information request instruction sending device analyzes the load change indication therein, and sends a resource load information request message of the adjacent cell to the corresponding terminal according to the analysis result;
(5′)终端收到资源负载信息请求消息后,在下一个上报的测量报告中包含邻小区资源负载信息。(5') After receiving the resource load information request message, the terminal includes the adjacent cell resource load information in the next measurement report to be reported.
上述过程的(2′)和小区负载的量化过程相关。小区负载的量化希望尽量精确,为此,本发明选择在采用长度为2N的序列的情况下,相位量化的值就定为N,终端在检测到相位偏移后,量化值的前N/2作为判断是否发生负载变化的依据,而量化值的后N/2只是作为参考值,在基站接收后进行相应处理时以较低的权值参与运算。(2') of the above process is related to the quantification process of the cell load. The quantization of the cell load is expected to be as accurate as possible. For this reason, the present invention chooses that in the case of using a sequence with a length of 2N, the value of the phase quantization is set as N. After the terminal detects the phase offset, the first N/2 of the quantization value As the basis for judging whether a load change occurs, the last N/2 of the quantized value is only used as a reference value, and it participates in the calculation with a lower weight when the base station performs corresponding processing after receiving it.
上述过程的(4′)中,负载变化指示的分析过程如下:In (4') of the above process, the analysis process of the load change indication is as follows:
本小区基站根据接收到的负载变化指示得出如图7所示的映射关系。其中,左边一列为上报的负载变化指示值等于1的终端701,按照其所接收到信号的邻小区的个数进行排序;右边一列为这些指示所对应的小区702,中间的连接线703表示终端上报的负载变化指示和相应小区之间的对应关系。本小区基站根据该映射关系,首先选择连接线最多的UE,向其发送邻小区资源负载信息请求消息,同时删除对应的连接线;之后再在剩下的映射关系中选择连接线最多的UE,向其发送邻小区资源负载信息请求消息,同时删除对应的连接线,直到所有的连接线被删除完毕。The base station of the cell obtains the mapping relationship shown in FIG. 7 according to the received load change indication. Among them, the left column is the terminal 701 whose reported load change indicator value is equal to 1, sorted according to the number of neighboring cells that it receives the signal; the right column is the
本发明给出了一种通过UE参与来获取邻小区资源负载信息的方案。该方案不需要在eNodeB之间进行信令交互实现资源负载信息的传输,以很小的代价完成了邻小区资源信息的传送。The present invention provides a scheme for obtaining resource load information of adjacent cells through UE participation. This solution does not require signaling interaction between eNodeBs to realize the transmission of resource load information, and completes the transmission of adjacent cell resource information at a small cost.
以上具体实施方式仅用于说明本发明,而非用于限定本发明。The above specific embodiments are only used to illustrate the present invention, but not to limit the present invention.
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