CN101631346B - Region switching method based on signal intensity and load estimation - Google Patents

Region switching method based on signal intensity and load estimation Download PDF

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CN101631346B
CN101631346B CN 200910022870 CN200910022870A CN101631346B CN 101631346 B CN101631346 B CN 101631346B CN 200910022870 CN200910022870 CN 200910022870 CN 200910022870 A CN200910022870 A CN 200910022870A CN 101631346 B CN101631346 B CN 101631346B
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cell
base station
load
handover
switching
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CN 200910022870
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CN101631346A (en
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刘勤
张文柱
李建东
李红艳
李维英
王力
盛敏
赵林靖
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西安电子科技大学
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Abstract

The invention discloses a region switching method based on signal intensity and load estimation, mainly solving problem of switch failure caused by excessive load intensity in a candidate cell. The switching method comprises the following steps: (1) a base station sends measuring control information to a mobile terminal periodically, meanwhile measures load information and resource information in the cell; (2) the base station decides whether a switching process is triggered according to the signal intensity in a measuring report of the mobile terminal, if the signal intensity in the cell is smaller than the signal intensity in other cells, connections are established between the base stations to exchange measured information; if not, step (1) goes on; and (3) the base station normalizes by unit and weighs the signal intensity and the load in each candidate target cell, and selects an optimal cell as a target switching cell. The invention has the advantages of high success rate of switching and low total time lag of switching, and mobile nodes can be switched from a service cell to another service cell in wireless network.

Description

基于信号强度和负载估计的区间切换方法 Section switching signal strength and load estimation method based on

技术领域 FIELD

[0001] 本发明涉及无线通信技术领域,特别是涉及到了第三代移动通信长期演进系统, 具体的说是一种负载估计的切换方法。 [0001] The present invention relates to wireless communication technologies, and in particular relates to a third generation mobile communication long term evolution system, specifically to the method of switching the load estimation. 用于在无线网络中移动节点从一个服务小区移动到另一个服务小区的切换。 A mobile node moves from a serving cell to another serving cell switching in a wireless network.

背景技术 Background technique

[0002] 伴随着未来移动通信系统的载波频率的增高,移动用户数目的不断的增大和新的电信业务的要求发生了变化,无线小区的覆盖范围将进一步缩小,切换也会相应的变得较以往更加频繁,宏小区,微小区,微微小区,以及不同系统的不同小区将会对一个物理区域进行重叠覆盖,而他们各自的负载情况,资源和服务速率等都可能不相同,特别是在网路融合的环境下,这种负载,资源和服务速率等因素对切换的影响更加明显。 [0002] With the increase in the carrier frequency of future mobile communication systems, the number of mobile users and constantly increasing demands of new telecommunications services has changed, the coverage of the wireless cell will be further reduced, the corresponding switch will become more more frequently in the past, different cell macro cell, micro cell, pico cell, and the system will be on a different physical area of ​​overlapping coverage, and their respective load, service rate, and so resources may not be the same, especially in the network under the road converged environment, the impact of this load, resources and services and other factors on the rate of switching is more obvious.

[0003] 在先进的长期演进系统LTE-Advanced中,移动性包括连接状态下的移动性和空闲状态下的移动性,保证移动用户的通话质量和服务质量QoS要求是研究的重点,而连接状态下的移动性主要指的是切换,切换的成功与否直接影响着用户的切换时间和数据丢失等重要参数,特别是对实时业务尤其重要。 [0003] In the advanced Long Term Evolution LTE-Advanced, the mobility include mobility in mobility and idle in the connection state, to ensure that mobile users call quality and quality of service (QoS) requirements are the focus of the study, and connection status mobility in the mainly refers to the switch, switch directly affect the success of an important parameter switching time users and data loss, in particular, it is especially important for real-time business.

[0004] 在第二代移动通信系统中切换决策主要取决于导频信道接收的信号强度,以接收信号强度的大小来决定将要切换到的目标小区。 [0004] The handover decision in the second generation mobile communication system depends on the pilot channel received signal strength, received signal strength of a size determined to be handed over to the target cell. 但是随着业务种类的越来越多和用户需求的不断增长,在一些情况下切换决策仅考虑信号强度时,会导致一种潜在的切换失败,比如选定的目标小区的信号强度最优,但是负载已经过载的情况或者是负载可能将过载的情况。 But as more and more types of business and growing user demand, when the handover decision in some cases, to consider only the signal strength will lead to a potential handover failure, such as signal strength selected optimal target cell, but the load has been overloaded or load may be overloaded. 这样就会在准入时被目标小区阻塞而导致切换的失败,从而给用户带来更大的切换时延甚至产生掉话现象。 Such access will be blocked when the target cell and cause failure of switched, leading to a larger handover delay to the user and even call drop phenomenon.

发明内容 SUMMARY

[0005] 本发明主要是针对上面所提到的由于在切换决策时只考虑目标小区的信号强度所带来的切换失败问题,提出了一种基于信号强度和负载估计的切换方法,以提高切换成功的概率,降低切换时延,进而减少因切换失败而导致的掉话现象。 [0005] The present invention is directed to a handover failure problems due to the handover decision when considering only the signal strength of the target cell brought mentioned above, the proposed handover method based on the signal strength and estimates the load to improve the handover probability of success and reduce the handover latency, thereby reducing call drop phenomenon due to switch failure caused.

[0006] 实现本发明目的的技术方案是:综合考虑目标小区的信号强度,总资源,服务速率,预估切换到达率,新呼叫到达率和当前负载等来做出切换决策。 [0006] The purpose of the present invention is technical solution: considering the signal strength of the target cell, the total resources, service rate, the estimated arrival rate switch, new call arrival rate and the current load, etc. to make a handover decision. 从信号强度和剩余资源考虑,选择一个信号强度和资源最优的目标小区。 The signal strength and remaining resource considerations, and select a signal strength of the target cell optimum resources. 当预测到目标小区资源缺乏时,使用户直接切换到另一个信号强度次优的小区,以此来减少切换失败概率。 When the target cell is predicted lack of resources, it enables the user to switch directly to the other cell signal strength suboptimal, in order to reduce the probability of handover failure. 同时使相邻小区的负载得到了均衡,提高无线资源的利用率。 At the same time the load of the adjacent cell has been balanced, improve the utilization of radio resources. 具体步骤包括如下: Specifically includes the following steps:

[0007] (1)基站周期性的向移动终端发送信号强度测量控制信息,移动终端根据测量控制信息发送测量报告给基站,同时基站周期性的测量本小区一段时间内的负载信息和资源fn息; [0007] (1) the base station to the mobile terminal periodically transmits the signal strength measurement control information, the mobile terminal transmits measurement control information to the base station according to the measurement, while the present cell base station periodically measuring the load information and resource information over time fn ;

[0008] (2)当移动终端的测量报告到达基站后,基站根据汇报的当前小区和周围小区的信号强度大小,决定是否触发切换程序,如果终端接收到的当前小区信号强度小于周围小区信号强度,基站与相邻基站通过建立连接交互各小区所测量到的信息,确定候选小区数; 否则,继续进行步骤(1); [0008] (2) When the measurement report the mobile terminal arrives at the base station, according to the current signal strength of the size of the cell and surrounding cells reported, determine whether to trigger the handover procedure, if the terminal receives a current cell signal strength is less than the surrounding cell signal strength , base station and neighboring base station by establishing a connection to interact with each cell information measured to determine the number of candidate cells; otherwise, proceed to step (1);

[0009] (3)当基站与相邻基站之间的链接建立后,基站对各个侯选目标小区的信号强度和通过基站之间的接口所获得的信息进行单位归一化并加权,按照所得结果的大小对候选小区列表进行排队,首选最优的小区作为目标切换小区。 [0009] (3) When the link between the base station and the neighboring base station to establish, for each candidate base station signal strength of the target cell and the information obtained by the interface between a base station and a unit normalized weighted according to the obtained size of the result list of the candidate cell line, the optimal choice for a target handover cell of the cell.

[0010] 所述的负载信息,包括小区的新呼叫到达率、呼叫失败概率、切换失败概率和本小区当前负载; Load Information [0010], comprising a cell arrival rate of new calls, call failure probability, the probability of handover failure and the present cell current load;

[0011] 所述的资源信息,包括小区的服务速率和小区总资源信息。 [0011] The resource information, including cell service rate and total cell resource information.

[0012] 所述的基站与相邻基站,包括相邻小区的基站和重叠覆盖小区的基站,以及相邻的异构网络下小区的基站。 [0012] the base station and the neighboring base station, including a base station and a neighboring cell overlapping base station coverage cell, the base station and the neighboring cell in a heterogeneous network.

[0013] 本发明与现有技术相比,具有如下优点: [0013] Compared with the prior art the present invention has the following advantages:

[0014] 1)本发明由于在测量信号强度的同时测量了小区内的负载信息和资源信息,决策时加入了目标小区的负载信息和资源信息这些可能会导致切换失败的因素,以此来预测各侯选小区的准入控制情况,从而来减少在切换决策后,可能因目标小区的负载过满,无可用资源而导致的切换失败,大大提高了切换成功的概率; [0014] 1) of the present invention, since the simultaneous measurement of signal strength measured load information and resource information in the cell, and added to the load information when the resource information of the target cell such decisions may result in failure of the switching element, in order to predict access control of each candidate cell, thereby reducing after switching decisions may be due to the load of the target cell is too full, without available resources caused by switch failure, greatly increasing the probability of successful handover;

[0015] 2)本发明由于在决策时加入了小区的负载信息和资源信息,提高了切换成功概率,降低因切换失败而带来的切换时延,有效的避免用户最不能容忍的调话现象; [0015] 2) The present invention due to the addition of load information and resource information of a cell in decision-making, increase the probability of successful handover, reducing handover failures due to handover delay brought effectively prevent the user from most intolerable phenomenon, then tune ;

[0016] 3)本发明由于在决策时考虑了目标小区的负载信息和资源信息,避免使终端切换至IJ负载比较重的小区,使相邻小区的负载得到了均衡,提高了无线资源的利用率。 [0016] 3) of the present invention, in consideration of the load information and resource information of the target cell at the time of decision, switching the terminal to avoid IJ heavier load cell, the load of the adjacent cell has been balanced to improve the utilization of radio resources rate.

[0017] 仿真结果表明,本发明的切换决策方法要比现有的切换决策方法有更好的性能。 [0017] Simulation results show that the handover decision method of the present invention than the conventional handover decision method has better performance. 特别是随着小区内负载强度的不断变大,现有的切换方法的性能会急剧降低,而本发明在切换成功率和减少时延方面都有着比较好的性能。 Especially with the load strength of the cell becomes larger and larger, the performance of the conventional switching method will be drastically reduced, and the delay aspect of the present invention is to reduce the handover success rate and have good performance.

附图说明 BRIEF DESCRIPTION

[0018] 图1是本发明区间切换的流程图; [0018] FIG. 1 is a flow chart of the present invention, switching section;

[0019] 图2是曼哈顿模型环境下的小区分布和UE移动图; [0019] and FIG. 2 is a cell distribution diagram in Manhattan UE mobility model of the environment;

[0020] 图3是平均负载强度占小区总资源2/3时,采用两种切换方法的切换成功率的结果仿真图; [0020] FIG. 3 is the average intensity of the load cell representing 2/3 of the total resources, using the simulation results of FIG handover success rate of two switching methods;

[0021] 图4是平均负载强度占小区总资源2/3时,新的切换方法所能减少的时延仿真图; [0021] FIG. 4 is an average load when the intensity of 2/3, a new handover method that can reduce the cell delay simulation in FIG total resource;

[0022] 图5是采用本发明与现有切换方法在不同平均负载强度下的切换成功概率图; [0022] FIG. 5 is the use of the present invention and the conventional method of switching the handover success probability map at different average load intensities;

[0023] 具体实施方式 [0023] DETAILED DESCRIPTION

[0024] 参照图1,本发明的具体实施步骤如下: [0024] Referring to FIG. 1, the specific embodiment of the present invention, the following steps:

[0025] 步骤1,基站向移动终端发送测量控制信息,并测量本小区相关信息。 [0025] Step 1, the base station to the mobile terminal transmits measurement control information, and the present measuring cell information.

[0026] la)基站周期性的向移动终端发送信号强度测量控制信息,移动终端根据测量控制信息,去测量从当前服务小区接收的信号强度和从相邻小区接收到的信号强度,以及所对应的小区列表,然后发送测量报告给基站; [0026] la) base station to the mobile terminal periodically transmits the signal strength measurement control information, the mobile terminal according to the measurement control information, to measure the received signal strength from the current serving cell and the signal strength received from the adjacent cell, and the corresponding cell list, and then transmits a measurement report to the base station;

[0027] lb)基站周期性的测量本小区一段时间内的呼叫到达率、呼叫阻塞概率、切换失败概率、当前负载、服务速率和小区总资源等信息。 [0027] lb) periodically measuring the call arrival rate base station within the cell of the present period of time, the call blocking probability, the probability of handover failure, the current load, service rate, and total cell information resources. [0028] 步骤2,根据步骤1中测量的信号强度来决定是否触发切换程序,并交互基站之间的测量信息。 [0028] Step 2, according to the signal strength measured in step 1 to determine whether to trigger a handover procedure, and the interaction between the measurement information of the base station.

[0029] 2a)当移动终端的测量报告到达基站后,基站根据测量报告中的当前小区和周围小区的信号强度大小,决定是否触发切换程序,如果终端接收到的当前小区信号强度小于周围小区信号强度或者低于最低接收门限值,启动切换程序; [0029] 2a) When the measurement report the mobile terminal arrives at the base station, according to the current signal strength of the size of the cell and the surrounding cells in the measurement report, determine whether to trigger the handover procedure, if the terminal receives a current cell signal strength is less than the peripheral cell signal or below the minimum reception strength threshold, initiate a handover procedure;

[0030] 2b)同时本小区的基站与它所相邻的所有小区的基站,包括同一个网络下的相邻小区的基站、或者是重叠覆盖小区下的基站,或者是相邻的异构网络小区下的基站,建立基站之间的连接,交互各小区所测量到的信息,使各个小区都拥有相邻小区的负载信息和资源信息,确定候选小区数;否则,继续进行步骤(1)。 [0030] 2b) while the base station of the present cell and all its adjacent cells of the base stations, including base stations in neighboring cells of a network under the same, or overlapping coverage is a cell of a base station or a neighboring heterogeneous network cell base station under connection is established, the interaction between the respective cell base station the measured information so that each cell has a load information and resource information of the neighboring cell, determine the number of candidate cells; otherwise, proceed to step (1).

[0031] 步骤3,将从基站之间交互所得到的新呼叫到达率、发起呼叫阻塞概率、切换失败概率通过下式转化为小区的预估切换到达率λρΜ产: [0031] Step 3, the interaction between the new call arrival rate is obtained from the base station, a call blocking probability, the probability of handover failure by the following formula into cell handover estimated arrival rate λρΜ yield:

[0032] KreJ = Q^7/」+ (1 _ 仅)C [0032] KreJ = Q ^ 7 / "+ (1 _ only) C

[0033] Xlli = Ph(I-B0)X0 [0033] Xlli = Ph (I-B0) X0

[0034] 其中,λ pM ik为第i个小区在k时刻的预估切换到达率,λΗ」为第i个小区的测量切换到达率,λ ^6Jk-1为第i个小区在k-Ι时刻的预估切换到达率,α为加权因子,λ。 [0034] wherein, λ pM ik is the estimated arrival rate of the switching cells in the i-th time k, λΗ "the i-th cell arrival rate measuring switch, λ ^ 6Jk-1 is the i-th cell in the k-Ι switching timing estimated arrival rate, α is a weighting factor, λ. 为本小区内新呼叫的到达率,B。 The arrival rate of new calls within the local cell, B. 本小区内为发起呼叫的阻塞概率,1\为本小区内发起切换请求的概率; Intra-cell blocking probability to initiate a call, a \ probability initiates a handover request in a cell-based;

[0035] 步骤4,将预估切换到达率和小区的新呼叫到达率分别转化为负载。 [0035] Step 4, the estimated arrival rate and the new handover call arrival rate into the load cell, respectively.

[0036] 4a)将所得到的预估切换到达率通过下式转换成带宽数: [0036] 4a) the estimated arrival rate is switched by the following formula obtained is converted into the number of bandwidth:

[0037] W = Ak *ω [0037] W = Ak * ω

LJ pre pre pre LJ pre pre pre

一1 “ One 1 "

[0038] λ k -. — / λ k [0038] λ k -. - / λ k

LuuljljJ pre , ' ρ re _ ι LuuljljJ pre, 'ρ re _ ι

η , = I “ η, = I "

[0039] 其中,Wpm为预估切换呼叫所占用的带宽,λ prek为所有相邻小区到达本小区的平均切换请求到达率,λ preJk为第i个小区在k时刻的预估切换到达率,ωρΜ为预估切换呼叫平均占用的带宽数,η为相邻小区的个数。 [0039] wherein, Wpm handover call is estimated bandwidth occupied, λ prek average of all the neighboring cells reaches this cell handover request arrival rate, λ preJk arrival rate is estimated to switch the i-th cell at time k, estimated number of switching ωρΜ average occupied bandwidth per call, η is the number of neighboring cells.

[0040] 4b)将直接从基站之间的接口所获得的小区的新呼叫到达率通过下式转换成带宽数: [0040] 4b) a new call arrival rate from an interface between a base station of a cell obtained by direct conversion into the number of bandwidth:

[0041] W0 = λ" * ωα [0041] W0 = λ "* ωα

[0042] 其中,W。 [0042] wherein, W. 为新呼叫所占用的带宽,λ。 Calls for the new occupied bandwidth, λ. η为在η时刻的新呼叫到达率,ω。 η for the new call arrival rate at the time of η, ω. 为新呼叫平均占用的带宽数。 The average number of calls for the new bandwidth is occupied.

[0043] 步骤5,基站对从移动终端的测量报告中所获得的信号强度,通过基站与基站之间的交互所获得的资源信息和步骤4得到的负载通过下式进行归一化加权得到效用函数Y : [0043] Step 5, the base station signal strength measurement reports obtained from mobile terminal, and the resource information obtained in 4 steps by the interaction between the base station and the base station load obtained by the following equation to obtain normalized weighted utility function Y:

[0044] Y = β qi/Q+(l-β ) (I-VSi) [0044] Y = β qi / Q + (l-β) (I-VSi)

[0045] Li = VUW0 [0045] Li = VUW0

[0046] 其中,Qi为第i个小区的信号强度,Q为整个候选小区的最大信号强度,Si为第i 个小区的总资源,β为加权系数,Li为第i个小区的总负载强度,Ii为第i个小区的当前负 [0046] where, Qi is the i-th cell signal strength, Q is the maximum signal strength of the entire candidate cell, Si is the total resources of the i th cell, β is a weighting coefficient, Li is the i-th cell total load strength , Ii is the i-th negative current cell

载强度。 Load strength.

[0047] 本发明的效果可以通过以下仿真进一步说明:[0048] 1)仿真条件:构建曼哈顿环境下的仿真模型,这个曼哈顿模型包括72个基站,每个基站下有一个小区,各建筑块的大小为200mX200m,移动终端沿着街道以36km/h的速度移动,向各个方向的移动是等概率的,终端初始化时随机的从某个十字路口上开始移动,统计在一段时间内用户在这段随机移动路线上所经过的小区中的切换成功概率。 [0047] The effect of the present invention can be further illustrated by the following simulation: [0048] 1) Simulation Conditions: simulation model constructed Manhattan environment, the Manhattan model includes a base station 72, a cell of each base station at each of the building blocks size 200mX200m, the mobile terminal speed to 36km h / moved along the street, moving in all directions is equal probability, moving at random from the terminal to initialize a crossroads, the user count a period of time during which random handover success probability on the movement route through which the cell.

[0049] 2)仿真结果: [0049] 2) The simulation results:

[0050] 2a)将采用本发明方法和原切换方法的切换成功概率进行仿真,其结果如图2所示。 [0050] 2a) The probability of success using the handover method of the present invention and the original simulated switching method, and the results shown in FIG. 在图2中,原切换决策只考虑信号强度大小,当小区内的负载强度过重时,会因为对目标小区的负载情况和空闲资源的未知,而导致切换的失败;而本发明方法由于考虑目标小区的信号强度时兼顾了目标小区的负载信息和资源信息,从而减少因为目标小区负载过满而导致切换请求被阻塞的现象,提高了切换成功的概率。 In FIG. 2, the former handover decision considering only the signal intensity level, when the intensity of the load in the cell is too heavy, because of the unknown on the load and the free resources of the target cell, resulting in failure of handover; and the present invention is a method in consideration of taking into account the signal strength of the target cell load information and resource information of the target cell, the target cell, thereby reducing the load because overfilling which led to the handover request is blocked, and enhanced the probability of successful handover. 由图2中可以看出,本发明方法在平均负载强度占小区总资源2/3时,随着时间的变化基本保持着接近100%的换成功率。 As can be seen from Figure 2, the method of the present invention accounts for 2/3 of the total cell resources, over time remained close to 100% of the average power into the load intensity.

[0051] 2b)对本发明方法在平均负载强度占小区总资源2/3时减少的切换时延进行仿真,其结果如图3所示。 [0051] 2b) of the method of the present invention, when two-thirds of the total cell resources to reduce handover delay average load intensity simulation, the results shown in Fig. 由图3中可以看出,本发明方法在平均负载强度占小区总资源2/3 时,较原切换方法可以减少接近20 %的总切换时延,避免了用户因时延过大而导致的切换失败或掉话现象。 As can be seen from Figure 3, the method of the present invention is accounted for in the average cell load strength of 2/3 of the total resources than the original method of switching can be reduced nearly 20% of the total handover delay, it avoids the user due to excessive delay caused by switch failure or a dropped call phenomenon.

[0052] 2c)对在不同负载强度下本发明方法和原切换方法的的切换成功概率进行仿真, 其结果如图4所示。 [0052] 2c) on the probability of successful handover method of the present invention and the original switching method at different simulated load strength, and the results shown in Fig. 由图4中可以看出,当负载较轻时原切换方法的成功概率和本发明方法接近;随着负载强度的变大,原切换方法的成功概率就会逐渐减低,因为目标小区的负载信息对切换请求的准入影响变大,这时因切换失败带来的切换时延和用户掉话的现象将会变大;而采用本发明方法,在切换决策时对目标小区的信号强度、负载信息和资源信息进行综合考虑,大大的提高切换的成功概率,并且随着负载强度的增强切换成功的概率始终保持在90%以上。 As can be seen in FIG. 4, the probability of success when the load is light and the switching method of the original method of the present invention is close; load strength becomes larger as the probability of success of the former will gradually reduce the switching method, since the load information of the target cell Effect admission request for switching becomes large, then due to handover delay caused by a handover failure and call drop phenomenon user will be larger; and the method of the present invention, when a handover decision signal strength of the target cell, the load information and resource information into account, greatly improve the probability of successful handover, and with the enhancement of the strength of the load switching probability of success has remained at 90%. 可以将终端切换到负载比较轻且信号强度较优的小区,使相邻小区的负载得到了均衡,提高了无线资源的利用率。 The terminal may be switched to the signal strength of the load is relatively light and superior cell, adjacent the load cell has been balanced to improve the utilization of radio resources.

[0053] 2d)对在不同负载强度下本发明方法减少的切换时延进行仿真,其结果如图5所示。 [0053] 2d) of reduced strength under different load switching delay of the process of the invention the simulation, the result shown in FIG. 由图5中可以看出,随着负载强度的增强本发明方法所减少的切换时延也随之变大,由于本发明考虑了目标小区的负载信息和资源信息,减少了切换失败的概率,有效的降低因切换失败所带来的时延,减少用户不能容忍的掉话现象。 As can be seen from Figure 5, as the load strength of the reinforcing method of the invention also reduce handoff latency becomes larger, since the present invention contemplates the load information and resource information of the target cell, reducing the probability of handover failure, effectively reduce the delay due to handover failure brought about by the reduction in call drop phenomenon user tolerated. 特别是在高负载情况下,可大大减少因切换失败带来的时延。 Particularly at high load, it can greatly reduce the delay caused by handover failure.

[0054] 仿真结果表明,本发明方法比原切换方法在切换成功概率和时延方面都有着更好的性能,可有效的降低用户因切换失败带来的时延,尽可能的避免用户不能容忍的掉话现象,特别适合现在的无线小区日趋微型化,切换日趋频繁化的情况。 [0054] The simulation results show that the present method than the original method of switching in the switching probability of success and have better latency performance, users can effectively reduce the delay due to handover failure brought as much as possible to avoid the user can not be tolerated call drop phenomenon, especially for today's wireless community increasingly miniaturized, more frequent switching of the situation. 且随着负载强度的增力口,本发明方法的性能要远远优于原切换方法。 With the load port and energizing the strength, the performance of the method of the present invention is much superior to the original switching method.

Claims (5)

1. 一种基于信号强度和负载估计的区间切换方法,包括如下步骤:(1)基站周期性的向移动终端发送信号强度测量控制信息,移动终端根据测量控制信息发送测量报告给基站,同时基站周期性的测量本小区一段时间内的负载信息和资源信息;(2)当移动终端的测量报告到达基站后,基站根据汇报的当前小区和周围小区的信号强度大小,决定是否触发切换程序,如果终端接收到的当前小区信号强度小于周围小区信号强度,基站与相邻基站通过建立连接交互各小区所测量到的信息,确定候选小区数;否则,继续进行步骤(1);(3)当基站与相邻基站之间的链接建立后,基站对各个侯选目标小区的信号强度和通过基站之间的接口所获得的信息进行单位归一化并加权:(3a)通过下式得到第i个小区在k时刻的预估切换到达率;Ifre f . 其中,λ HJ为第i个小区的测量切换到达 CLAIMS 1. A method for signal strength and the switching section based on the estimated load, comprising the steps of: (1) the base station periodically sends the signal strength measurements to the control information to the mobile terminal, the mobile terminal transmits measurement control information to the base station according to the measurement, while the base station periodically measuring the load and resource information of the cell information in the present period of time; (2) when the measurement report the mobile terminal arrives at the base station, the signal strength of the current cell size and the cell surrounding reported, determine whether to trigger a handover procedure, if the terminal receives the signal strength of the current cell is less than the signal strength of the neighboring cells, the base station and the neighboring base station information of each cell is measured by establishing a connection to the interaction, determining the number of candidate cells; otherwise, proceed to step (1); (3) when the base station after establishing a link between neighboring base stations, base station signal strength of each candidate cell and the target information obtained by the interface between a base station and a weighted normalized units: (3a) obtained by the i-th formula estimated arrival rate cell switching at time k; Ifre f wherein, λ HJ is the i-th arrival measurement cell handover. 率,A^l为第i个小区在k-Ι时刻的预估切换到达率,α为加权因子,λ。 Rate, A ^ l i th cell arrival rate estimated handover time k-Ι, α is a weighting factor, λ. 为本小区内新呼叫的到达率,B。 The arrival rate of new calls within the local cell, B. 本小区内为发起呼叫的阻塞概率,Ph为本小区内发起切换请求的概率;(3b)将预估切换到达率和从基站之间的接口所获得的小区的新呼叫到达率均转化为负载;(3c)通过下式对信号强度和负载进行归一化加权得到效用函数Y : Y = β(^Αί+(1-β) (I-Vsi)Li = li+Wpre+W0其中,Qi为第i个小区的信号强度,Q为整个候选小区的最大信号强度,Si为第i个小区的总资源,β为加权系数,Li为第i个小区的总负载强度,Ii为第i个小区的当前负载强度,Wpre预估切换呼叫所占用的带宽,W0为新呼叫所占用的带宽;(4)按照步骤(3)所得结果的大小对候选小区列表进行排队,选择最优的小区作为目标切换小区。 To initiate the call blocking probability, the probability of initiating the handover request in this cell-based cell Ph; (3B) of the new call arrival rate and the estimated switching obtained from the interface between the base station cell arrival rate into the load ; (. 3C) the formula for the signal strength and the load carried by normalizing the weighting to obtain a utility function Y: Y = β (^ Αί + (1-β) (I-Vsi) Li = li + Wpre + W0 wherein, Qi is the signal intensity of the i th cell, Q is the maximum signal strength of the entire candidate cell, Si is the total resources of the i th cell, β is a weighting coefficient, Li is the total load strength of the i-th cell, Ii is the i th cell current load strength, Wpre is estimated bandwidth occupied by the call switching, W0 is the bandwidth occupied by the new call; size (3) of the result (4) according to the procedure of queuing list of candidate cells, select an optimal target cell cell handover.
2.根据权利要求1所述区间切换方法,其中步骤(1)所述的负载信息,包括小区的新呼叫到达率、发起呼叫阻塞概率、切换失败概率和本小区当前负载;所述的资源信息,包括小区的服务速率和小区总资源信息。 2. The handover method as claimed in claim 1 interval, wherein the step of loading information (1), including the new call arrival rate cell, a call blocking probability, the probability of handover failure and the present cell current load; according to the resource information including community service rate and total cell resource information.
3.根据权利要求1所述区间切换方法,其中步骤(¾所述的基站与相邻基站,包括相邻小区的基站和重叠覆盖小区的基站,以及相邻的异构网络下小区的基站。 According to claim 1 the switching section, wherein the step (¾ of the base station and a neighboring base station, including a base station and base stations of adjacent cells overlapping coverage of the base station and the neighboring cell in a heterogeneous network.
4.根据权利要求1所述区间切换方法,其中步骤(3b)所述的将预估切换到达率转化为负载,是通过下式转换成带宽数:其中,Wpre为预估切换呼叫所占用的带宽,I二为所有相邻小区到达本小区的平均切换请求到达率,为第i个小区在k时刻的预估切换到达率,«pre为预估切换呼叫平均占用的带宽数,η为相邻小区的个数。 4. The handover method as claimed in claim 1 interval, wherein the step (3b) according to the estimated arrival rate into the load switch, the number of the bandwidth is converted by the following formula: wherein, for the estimated handover call Wpre is occupied Bandwidth, for all the i two neighboring cells of the cell reaches the average handover request arrival rate, the i-th cell handover estimated arrival rate at time k, «pre handover call number average estimate of bandwidth occupied, [eta] relative the number of neighbor cells.
5.根据权利要求1所述区间切换方法,其中步骤(3b)所述的将小区的新呼叫到达率转化为负载,是通过下式转换成带宽数: W 二JT * ωO O O其中,W。 5. The handover method as claimed in claim 1 interval, wherein the step (3b) of the new call arrival rate into the load cell, by the following formula is converted into a number of bandwidth: W two JT * ωO O O wherein, W. 为新呼叫所占用的带宽,;I:为在η时刻的新呼叫到达率,ω。 For the new call occupied bandwidth,; I: a new call arrival rate η at the time, ω. 为新呼叫平均占用的带宽数。 The average number of calls for the new bandwidth is occupied.
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