CN1378357A - Method for soft switching subzone of mobile station in CDMA communication system - Google Patents

Method for soft switching subzone of mobile station in CDMA communication system Download PDF

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CN1378357A
CN1378357A CN 01105856 CN01105856A CN1378357A CN 1378357 A CN1378357 A CN 1378357A CN 01105856 CN01105856 CN 01105856 CN 01105856 A CN01105856 A CN 01105856A CN 1378357 A CN1378357 A CN 1378357A
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link
soft
forward
switching
plot
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CN 01105856
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Chinese (zh)
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CN1145295C (en )
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彭芳
汪勇刚
陈巍
吴勇
嵇家刚
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华为技术有限公司
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Abstract

The present invention discloses a soft switching method for movable station to switch over the plots in code division multi-address communication system, which mainly increases the influence condition of back ward link interference. The performance of backward link is judged by forward fading and backward load, which can make comprehensive evaluation for the condition of forward link interferenceand bakcward link interference and can make comprehensive consideration for the load and distance fading of forward and backward link so that the plot situation can be evaluated more fully at the time of selecting plot by soft switch. It is easy to establish the most suitable soft switching branch to ensure selecting the service plot which can make the best gain for the system when there is a quite number of service plots that can be selected.

Description

码分多址通信系统中移动台软切换小区的方法 The method of CDMA mobile communication system in soft handoff cell

本发明涉及宽带移动通信系统,更具体地指在CDMA2000系统中,一种码分多址通信系统中移动台软切换小区的方法。 The present invention relates to a broadband mobile communication system, and more particularly refers to a cell in soft handoff method for a CDMA mobile communication system in a CDMA2000 system.

可以进行软切换是码分多址(CDMA)系统的一个特有的优点。 A soft handoff may be code division multiple access (CDMA) system unique advantages. 它特指移动台在一个频点上不同小区(或扇区)间的切换,一般包括三个步骤,1)移动台在当前频点上周期性搜索所有可用PN(请标出中文含义)偏置的导频信号,以发现原有服务小区的导频变弱,相邻小区的变强;2)移动台上报导频强度测量报告(PSMM)给基站控制器(BSC),基站控制器(BSC)通过基站收发器(BTS)下发消息让新小区为移动台分配业务信道,建立连接,此时移动台与原小区的连接仍未中断,进入同时和多个基站收发器(BTS)建立连接的分集状态;3)随着移动台进一步远离原小区,原小区信号降至某一门限下一段时间后,移动台上报导频强度测量报告(PSMM)给基站控制器(BSC),基站收发器(BTS)下发消息令原小区中止与移动台的连接。 It refers specifically to a mobile station in handover between different frequency on the cell (or sector), generally includes three steps, 1) the mobile station at the current frequency point periodically searches for all available PN (tick all Chinese meaning) Partial pilot signal set, to find the original pilot frequency serving cell becomes weak, the adjacent cell becomes stronger; 2) on the mobile station reporting pilot strength measurement report (the PSMM) to the base station controller (the BSC), a base station controller ( BSC) through the base transceiver stations (BTS) so that the new cell assignment message traffic channel for the mobile station to establish a connection, when connecting the mobile station to not interrupt the original cell, and at the same time into the plurality of base transceiver stations (BTS) to establish diversity status of the connection; 3) as a mobile station further away from the source cell, the source cell signal drops below a certain threshold at a time, the mobile station reports the pilot strength measurement report (the PSMM) to the base station controller (the BSC), base transceiver the device (BTS) of the original message so that the cell suspension connected to the mobile station. 由新小区单独为移动台提供服务。 Serving the new cell the mobile station alone. 至此,软切换过程结束。 So far, the soft handover process ends. 为了方便表述起见,这里不考虑小区内划分扇区的情况。 For the sake of convenience of description, consider the case where the cell is not divided into sectors.

软切换可能是由移动台位置移动引起,也可能是因为无线环境发生变化等其他原因造成,总之,是由于小区和移动台间无线接收状况发生变化引起的。 Soft handover may be caused by the position of the mobile station moves, it may be because of other causes wireless environment changes, etc. In short, due to inter-cell and the mobile station radio reception conditions change due. 移动台连续测量所有可用导频,只要测得有强度大于一定门限的导频且基站控制器(BSC)允许,就建立和其相应小区的连接。 The mobile station continuously measures the pilots are available, as long as the measured intensity is greater than a certain threshold have a pilot and the base station controller (BSC) to allow, on the establishment of connection and its corresponding cell. 软切换为系统带来的好处有:1)真正实现了无缝切换。 Bring the benefits of soft switching system are: 1) truly seamless switching. 移动台在软切换时始终保持着业务,不会有硬切换测量造成的通话中断,减小了掉话的可能性。 The mobile station in soft handover has maintained a business, there will be no call interruption caused by a hard handover measurements, reducing the likelihood of dropped calls. 2)移动台和多个基站同时保持连接时,基站控制器(BSC)通过分集提高了反向接收信号的误帧率,降低了移动台所需的发射功率,减小了反向链路上的干扰,增加了反向容量。 2) a plurality of base stations and a mobile station while maintaining the connection, a base station controller (BSC) improved by diversity reverse frame error rate of a received signal, reducing the transmit power required by a mobile station, on the reverse link is reduced interference, increase reverse capacity.

为了获得最佳的分集效果并在软切换后进入最佳小区,一般要求软切换时选择前向无线连接较好的小区,这样移动台分集合并的是最优的接收信号。 For best diversity effect and the best cell after entering soft handover, the general requirements of the cell before the connection is preferably selected soft handoff to the radio, so that the mobile station diversity combining the received signal is optimum. 可以降低前向所需的发射功率。 Before power can be reduced to the desired emission. 但这仅仅考虑前向的小区选择是不全面的,还应考虑到反向的影响。 But this is only considering the forward cell selection is not comprehensive, it should also take into account the reverse effect. 反向链路上,移动台处于软切换状态时一般已经对相邻小区构成了强干扰,此时接入的小区如果可以使所需的反向发射功率最小,对邻小区的干扰降到最小,就可以最大限度地增加系统的反向容量。 On the reverse link, the mobile station is in soft handoff generally has adjacent cells constitute a strong interference, at this time, if a cell can make access to the required minimum reverse transmission power, interference to neighbor cells to minimize , can maximize the reverse system capacity.

因此软切换小区选择还应该考虑以下三方面因素:1)距离衰减。 Thus soft handover cell selection should also consider the following three factors: 1) the distance attenuation. 2)前向链路的干扰。 The forward link interference 2) before. 3)反向链路的干扰。 3) reverse link interference. 在传统方法中,切换判决仅基于对前向链路的导频强度的测量,测量的是导频信号的Ec/Eo值,该值反映的是基站距离远近和前向链路的干扰大小,而没有体现出反向负荷的影响。 In the conventional method, a handover decision based only on measurement of the frequency of the forward link pilot strength is measured Ec / Eo value of the pilot signal, the interference value reflects the size of distance and the base station the forward link, and does not reflect the influence of the reverse load. 在业务对称的系统(如IS-95)中,前反向链路负荷相当,可以不必另外考虑反向链路的干扰,而CDMA2000系统中业务是不对称的,如果前向负荷大于反向负荷,即当前向容量限制是业务接入的瓶颈时,为了简化起见,也可以不考虑反向负荷的影响。 Business symmetric systems (e.g., IS-95), the quite reverse link load may not be necessary to consider the interference of the reverse link further, the CDMA2000 system is asymmetric traffic, if the first counter is greater than a load to the load , i.e. a current bottleneck in the access to a capacity limit, for simplicity, may not be considered to adversely affect the load. 然而,在某些区域如果反向负荷大于前向负荷时,小区的选择则需要综合考虑以上三方面的因素。 However, if certain areas before the reverse load is greater than the above three factors into account when the load cell selection is required. 否则有可能出现选择的小区尽管前向需要的发射功率小,但由于反向负荷重,移动台发射功率高,反向容量减小而限制了系统的总体性能。 Otherwise, there may be selected although the forward transmission power of a cell requires a small, but the reverse load weight, highly mobile station transmit power, and reducing the reverse capacity limits the overall performance of the system.

现有的软切换技术在选择小区时依据的是导频的Ec/Io,值,该值只能反映前向链路上信号的衰落情况以及前向链路的干扰大小,无法反映出反向链路的干扰情况,这样有可能使移动台接入一个前向链路较好,但在反向发射功率较大的小区,却减小了反向容量。 Existing techniques based on soft handover when a cell is selected pilot Ec / Io, values, before the values ​​reflect only signal fading on the forward link and the front link to the interfering size, does not reflect the reverse link interference, so it is possible that the mobile station accesses a good link before, but the reverse transmission power in larger cells, but the reverse capacity is reduced. 实际上,由于前向链路好意味着前向发射功率较小,所以这意味着要综合考虑前向发射功率和反向发射功率。 In fact, due to the forward link before a good means to transmit power is small, so it means to be taken into account before the power to transmit power and reverse transmission. 显然在这两者都较小时是最优的。 Obviously when both are small it is optimal. 然而可能存在着这样的情况,移动台和小区1建立连接,需要的前向发射功率小但反向发射功率大;移动台和小区2建立连接,需要的前向发射功率大但反向发射功率小,应该选择哪个小区接入需要综合评价这两方面因素对系统的影响。 However, there may be the case, the mobile station and the cell to establish a connection, but the former requires a small reverse transmission power of the forward transmission power large; cell 2 and the mobile station to establish a connection, but the former requires a large reverse transmission power to transmission power small cell access should choose which require comprehensive evaluation of the impact of these two factors on the system. 因此,现有的软切换方法只强调一个方面是不够完善的。 Therefore, the conventional soft handover method only emphasize one aspect is not perfect.

为此,本发明的目的是提出一种码分多址通信系统中移动台软切换小区方法,该方法能综合考虑小区前反向链路的负荷和距离衰落,增加反向链路干扰的影响条件,在软切换选择小区时能够更全面地评价小区,确保选出使系统增益最大的服务小区。 To this end, an object of the present invention is to propose conditions affecting cell in soft handoff method which can be considered a load cell and a distance between the front reverse link fading, interference increases the reverse link CDMA mobile communication system is one kind of when soft handover selecting a cell can more fully evaluate the cell, select the system to ensure maximum gain of the serving cell.

为了实现上述目的,本发明采用如下技术方案;该软切换小区方法基于码分多址系统,在该系统中,包括一个基站控制器,由该基站控制器控制的数个基站收发器,由移动台到激活的基站收发器的反向链路和由激活的基站收发器到移动台的前向链路,移动台以及各基站收发器均包括一个发射接收机,其特征在于该方法包括以下步骤:a,使移动台与该系统中的至少一个基站收发器建立业务信道,移动台周期性搜索使用频点上各基站收发器的导频;b,基站控制器根据移动台导频激活集中的导频数,确定激活集加入门限或激活集动态加入门限,并将激活集加入门限或激活集动态加入门限下发给移动台;c,移动台连续检测各基站收发器的导频强度并上报给基站控制器;d,基站控制器对移动台当前激活集里的导频数进行判断并将判断结果通过前向链路下发 To achieve the above object, the present invention adopts the following technical solution; the CDMA soft handover cell based system, the system comprising a base station controller, the base station controller is controlled by a number of base transceiver stations by the mobile station to the active base transceiver station and the reverse link by activated before the base transceiver station to the mobile station forward link, the mobile station and each base transceiver station includes a transmitter-receiver, characterized in that the method comprises the steps of : a, so that the mobile station establishes a traffic channel with the system at least one base transceiver station, the mobile station periodically searches using each base transceiver station on a pilot frequency; B, a base station controller in accordance with the frequency of the mobile station active set pilot the number of pilot, determining active set addition of a threshold or an active set dynamically added to the threshold, and the active set addition of a threshold or an active set dynamically added to the threshold to the mobile station; C, the mobile station continuously detects the respective base transceiver station pilot strength and reported to base station controller; d, the base station controller for conducting mobile station is currently in the active set for frequency determination by the determination result sent to the front link 给移动台和相关的基站收发器;e,基站控制器选择系统性能优先值Es低的小区从激活集里剔除或不予进入,再通过导频指配消息将选中的小区通知移动台,移动台根据基站控制器的指令建立与新小区的连接,执行完毕后再返回步骤a;f,以上步骤循环进行,直到移动台结束业务状态为止。 Related to the mobile station and the base transceiver station; E, a low performance base station controller selects the cell priority value Es in or removed from the active set not to enter, and then through a pilot assignment message to the selected cell notifies the mobile station, the mobile the instruction station establishes connection to a base station controller of the new cell, then processing returns to step finished a; f, the above cycle of steps until the state of the mobile station until the end of the business.

由于本发明的码分多址通信系统中移动台软切换小区方法采用了上述的方法,增加反向链路干扰的影响条件,反向链路性能用前向衰落和反向负荷进行判定,因此,本发明的方法能综合评价前向链路的干扰和反向链路的干扰情况,还能综合考虑小区前反向链路的负荷和距离衰落,在软切换选择小区时能够更全面地评价小区状况,在可选服务小区较多时,便于建立最适合的软切换分支,确保选出使系统增益最大的服务小区。 Due to conditions in soft handoff method uses a cell the method described above, increasing the reverse link interference CDMA communication system according to the present invention moves with reverse link performance prior to fading and determination reverse load, therefore, the method of the present invention before the interference can interfere with the comprehensive evaluation of the link and the reverse link, and also considering the load cell from fading before the reverse link, the cell can be evaluated more fully in soft handover cell selection situation, when there are many optional services community, facilitate the establishment of the most appropriate soft handover branch to ensure that the selected system gain the largest service area.

下面结合附图和实施例,对本发明的方法作一详细地说明:图1为码分多址通信系统原理示意图。 In conjunction with the accompanying drawings and the following embodiments, the method of the present invention will be described in detail with a: FIG. 1 is a schematic view of the principle of CDMA communication systems.

图2为在码分多址通信系统中,移动台与一个小区建立连接示意图。 FIG 2 is a code division multiple access communication system, a mobile station and a cell established connection diagram.

图3为在码分多址通信系统中,移动台与多个小区建立连接示意图。 FIG 3 is a code division multiple access communication system, a mobile station and a plurality of cells established connection diagram.

图4本发明的方法流程示意图。 The method of the present invention the flow of FIG. 4 FIG.

请参阅图1所示,通常,在码分多址通信系统中,至少包括一个基站控制器11,由该基站控制器11控制的多个基站收发器121~12N(每个基站收发器对应一个小区),由移动台13到激活的基站收发器(BTS)的反向链路和由激活的基站收发器到移动台13的前向链路。 Please refer to FIG. 1, generally, in a CDMA communication system, comprising at least one base station controller 11, by the base station controller corresponding to a plurality of base transceiver control 11 to 121 ~ 12N (each base transceiver station cell), and before the activation by the mobile station 13 to the base transceiver station (BTS) is activated by a reverse link to a base transceiver station 13 to the mobile link. 其中,移动台13包括一个发射接收机,各基站收发器也均包括一个发射接收机。 Wherein mobile station 13 comprises a transmitter-receiver, each of the base transceiver station also includes a transmitter-receiver.

非切换状态时,移动台13只检测到一个强度大于激活集加入门限T_ADD的导频,即只有一个激活的基站收发器与移动台13建立联系。 When the non-switching state, the mobile station 13 detects a strength greater than the threshold T_ADD is added the active set pilot, i.e., only one active base transceiver station and the mobile station 13 to establish contact. 如有多个强度大地激活集加入门限T_ADD的导频,则有可能同时与多个基站建立联系,即建立多个软切换分支,见图2,考虑到建立分支会减小前向容量,以及过多的分支对反向增益意义不大,软分支数一般不大于3。 If a plurality of conductive ground active set intensity threshold T_ADD is added to the frequency, it is possible to establish contact with a plurality of base stations simultaneously, i.e. the establishment of a plurality of soft handover branch, shown in Figure 2, taking into account the capacity before the establishment of the branch may be reduced, and too many branches on the reverse gain little significance, the number of branches soft generally not more than 3.

一般来说,移动台在选择小区时,接入后使前向发射功率较小的小区因前向Ec/Io值较大,在满足相同的解调门限时所需反向发射功率较小的小区应该信号干扰比相对较大,这要求相应的无线链路衰落小、干扰小。 Generally, when the mobile station selects a cell, so that after the former due to the forward access Ec / Io value is large to the smaller cell transmission power, to meet the required threshold, the same demodulating reverse transmission power smaller cell interference ratio should be relatively large, which requires the corresponding radio link fading is small, a small disturbance. 但反向衰落目前还无法准确测得,只能用前向衰落近似估计。 But it is still unable to reverse the decline accurately measured, only to decline to approximate before use.

在软切换小区选择时,如果选择反向负荷重或反向衰落大的小区,由于该链路上的信号干扰比相对较小,反向发射功率不变时,该小区基站接收的信号误帧率较大,在反向分集合并后,功率控制下要求的反向发射功率也较大。 When soft handover cell selection, if the load is heavy selected reverse or reverse the decline of large cells, due to signal interference on the link ratio is relatively small, when the reverse transmission power constant, the base station receives cell signals errored frame the reverse transmission rate is high power, after combining the reverse, a power control requirements are large. 也就是说软切换时接入这种小区比接入其他反向负荷轻或衰落小的小区需要的反向发射功率大。 That access this cell is greater than the reverse transmission or access to other reverse load is light fading small cell power needs soft handover. 而移动台发射功率越大,对各小区的反向干扰就越大。 The larger the transmit power of the mobile station, the greater the reverse interference of each cell. 因此在选择时还应该结合反向链路状况,优先选择反向负荷轻、衰落小的小区。 Therefore, consideration should be selected in conjunction with a reverse link condition, preference reverse load is light, small-cell decline.

基于上述的考虑,本发明的软切换小区方法包括以下步骤:a,使移动13台与该系统中的至少一个基站收发器建立业务信道,移动台13处于业务状态中,使用的频点是f1,移动台13周期性搜索频点f1上各基站收发器121-12N的导频。 Based on the above considerations, the soft handover cell method of the present invention comprises the steps of: a, mobile 13 station establishes a traffic channel with the at least one base station transceiver in the system, the mobile station 13 in a traffic state, the frequency used is f1 each base station 13 the mobile station periodically searches frequency f1 of the transceiver pilot 121-12N.

b,基站控制器11根据移动台13导频激活集中的导频数,确定激活集加入门限T_ADD或激活集动态加入门限T_ADD_DYC,并将激活集加入门限T_ADD或激活集动态加入门限T_ADD_DYC下发给移动台13。 B, the base station controller 11 the number of pilots in the active set in accordance with 13 guide the mobile station pilot, determining active set is added threshold T_ADD or active set dynamically join threshold T_ADD_DYC, and the active set to the mobile added threshold T_ADD or active set dynamically join threshold T_ADD_DYC Taiwan 13. 动态加入门限T_ADD_DYC的意义在于当所建立的软切换分支较多时,限制增益不高的新分支建立。 Dynamic threshold T_ADD_DYC added significance is that when more established soft handover branch, limiting the gain is not high new branch establishment.

c,移动台13连续检测各基站收发器121-12N的导频强度并上报给基站控制器11。 c, the mobile station 13 detects the respective base transceiver station and 121-12N pilot strength reported to the base station controller 11.

d,基站控制器11对移动台13当前激活集里的导频数进行判断并将判断结果通过前向链路下发给移动台和相关的基站收发器。 d, the base station controller 11 to the mobile station set in the number of pilot 13 currently activated prior to the determination by the determination result to the mobile station and the associated base transceiver station downlink.

e,基站控制器11选择系统性能优先值Es低的小区从激活集里剔除或不予进入,再通过导频指配消息将选中的小区通知移动台13,移动台13根据基站控制器11的指令建立与新小区的连接,执行完毕后再返回步骤a。 E, the base station controller 11 selects the system performance low priority value Es cells in or removed from the active set not to enter, and then through a pilot assignment message to the selected cell notifies the mobile station 13, mobile station 13 the base station controller 11 instructions to establish a connection with the new cell, then processing returns to step finished a.

f,以上步骤循环进行,直到移动台13结束业务状态为止。 F, the above cycle of steps until the state of the mobile station 13 until the end of the business.

在所述的步骤b中,若移动台13导频激活集中只有一个导频时,则基站控制器11下发激活集加入门限T_ADD给移动台;若移动台13导频激活集中有一个以上导频时,则基站控制器11下发激活集动态门限T_ADD_DYC给移动台13。 In step b, the pilot if the mobile station 13 has only one active set pilot, the base station controller 11 delivers an activation threshold T_ADD is added to the set of the mobile station; if the mobile station 13 of the pilot in the active set has more than one guide when the frequency, the base station controller 11 delivers the dynamic threshold T_ADD_DYC active set to the mobile station 13.

所述的激活集加入门限T_ADD值由系统设定,一般取-13db;所述的激活集动态加入门限T_ADD_DYC值根据公式(1)T_ADD_DYC=max{(SOFT_SLOPEs/8)*10*log10Σi∈APSi+ADD_INTERCEPT/s2,T_ADD/(-2)}(1)]]>求出。 The active set is added threshold T_ADD value is set by the system, and generally -13dB; the active set dynamically join threshold T_ADD_DYC value according to Equation (1) T_ADD_DYC = max {(SOFT_SLOPEs / 8) * 10 * log10 & Sigma; i & Element; APSi + ADD_INTERCEPT / s2, T_ADD / (- 2)} (1)]]> is obtained.

在所述的步骤c中,移动台13连续检测各基站收发器的导频强度并上报给基站控制器11是指当发现有导频强度大于激活集加入门限T_ADD或激活集动态加入门限T_ADD_DYC的导频时,通过导频强度测量报告消息将此导频上报给基站控制器11。 In step c, the mobile 13 detects each of the base transceiver station pilot strength station and reported to the base station controller 11 means that when there is a pilot strength is greater than the active set addition of threshold T_ADD or active set dynamically join threshold T_ADD_DYC of a pilot measurement report message by the pilot strength of the pilot reports this to the base station controller 11.

在所述的步骤d中,基站控制器11对移动台当前激活集里的导频数进行判断时,若导频数小于3时,则直接将新导频加入激活集中;若导频数大于等于3时,由于前反向发射功率是相对独立的,综合评价对系统的影响可以采用加权求和,则根据公式(2)Es=αPf/Pf_max+βPr/Pr_max......(2)]]>计算当前激活集中的导频和新导频的系统性能优先值Es,选出优先值最低的导频,若该导频是当前激活集中的,则从激活集中删除,若该导频是新导频,则拒绝加入激活集。 When in said step d, the base station controller 11 to the mobile station is currently set in the number of pilot activation judgment, when the frequency of the derivative is less than 3, then directly to the new perch added active set; when the number of pilot than or equal to 3 Since reverse transmission power of the former is relatively independent, comprehensive evaluation of the impact of the system may employ a weighted summation according to the equation (2) Es = & alpha; Pf / Pf_max + & beta; Pr / Pr_max ...... ( 2)]]> calculate the current active set pilot and new pilot system performance priority value Es, the lowest value is selected priority pilot, if the pilot is the current active set, deleted from the active set, if the pilot is a new pilot, then refused to join the active set.

公式(2)中,Es是求出的系统性能优先值,由该值判断软切换时的小区选择,优选该值比较高的小区建立软切换分支。 Equation (2), Es is the system performance is obtained priority values, when the cell selection is switched from the soft determination value, the value is preferably relatively high to establish cell soft handover branch. Pf是前向初始发射功率,即基站所需的初始发射功率。 Pf is a forward initial transmit power, i.e., the desired base station initial transmit power. Pr是反向初始发射功率,即移动台所需的发射功率。 Pr is the reverse initial transmit power, i.e., the mobile station transmission power required. Pf_max是前向给单个用户分配的最大发射功率,α是一个正的权值,反映前向发射功率对系统性能的影响,β也是一个正的权值,反映反向发射功率对系统性能的影响。 Pf_max is the maximum transmit power to a single user prior to distribution, [alpha] is a positive weighting value to the transmission power impact on system performance, positive beta] is a front weights reflect, reflect the reverse transmission power impact on system performance . 这两个值在后台数据库中设定,可以由系统调整。 These two values ​​set in the database in the background, can be adjusted by the system. 在需要简化操作或反向负荷不重于前向负荷的情况下,可以取β=0。 The need to simplify the operation or a reverse load is not heavy to the case of the forward load may take β = 0.

所述的公式(2) According to Equation (2) 中,移动台指定的前向初始发射功率Pf根据公式(3)Pf=min[Ppilot_send·10D+0.5M10·RW,Pmax]......(3)]]>进行计算。 The mobile station specifies an initial forward transmission power Pf in accordance with Equation (3) Pf = min [Ppilot_send & CenterDot; 10D + 0.5M10 & CenterDot; RW, Pmax] ...... (3)]]> is calculated.

公式(3)中,Pf为移动台指定的前向初始发射功率;Ppilot_send为基站发射的前向导频强度;D为上述移动台侧解调所要求的,基站必须满足的信息位比特能量与干扰谱密度的比值,即 Equation (3), Pf is designated to the mobile station before an initial transmit power; Ppilot_send before the base station transmitted pilot strength; D is the side of the mobile station required for demodulation, the base station must satisfy the bit energy-to-interference information bits spectral density ratio, i.e., (移动台侧);M为上述得到的前向导频强度项的内容,M=-2·10·logPS;Pmax为移动台可以使用的最大功率。 (Mobile station side); M obtained in the above forward pilot strength content item, M = -2 · 10 · logPS; the maximum power Pmax of the mobile station can be used.

而反向初始发射功率Pr根据公式(4)Pr=(EbIo)BS·R·RSSIPr_loss·W......(4)]]>进行计算。 Pr reverse initial transmit power according to Equation (4) Pr = (EbIo) BS & CenterDot; R & CenterDot; RSSIPr_loss & CenterDot; W ...... (4)]]> is calculated.

公式(4)中, Equation (4), 是基站侧解调所要求的,上述移动台为了满足服务质量要求而必须满足的信息位比特能量与干扰谱密度的比值;R是业务的信息速率;RSSI为反向链路信号总强度,由基站测得;Pr_loss是反向路径衰落,与反向开环功控类似,可以用前向路径衰落Pf_loss估计,即Pr_loss≈Pf_loss,而Pf_loss=Ppilot_rec/Ppilot_send=(EcIo)·Io·1.2288·106(chip/s)Ppilot_send·RW]]>所以公式(4)有:Pr=(EbIo)BS·R·RSSIPr_loss·W≈(EbIo)BS·Ppilot_send·R(EcIo)·Io·1.2288·106(chip/s)·RSSIW·RW.]]>软切换过程中,移动台可以检测到多个强度大于激活集加入门限T_ADD的导频,判断过程请见下面的表1和表2示意:表1 Demodulating the base station side is required, the information bit ratio of bit energy to interference spectral density of the mobile station in order to meet quality of service requirements that must be met; R is the information rate traffic; the RSSI is the total reverse link signal strength from the base station measured; Pr_loss is reverse path fading, reverse open loop power control similarly can fading with forward path Pf_loss estimation, i.e. Pr_loss≈Pf_loss, and Pf_loss = Ppilot_rec / Ppilot_send = (EcIo) & CenterDot; Io & CenterDot; 1.2288 & CenterDot ; 106 (chip / s) Ppilot_send & CenterDot; RW]]> so equation (4): Pr = (EbIo) BS & CenterDot; R & CenterDot; RSSIPr_loss & CenterDot; W & ap; (EbIo) BS & CenterDot; Ppilot_send & CenterDot; R (EcIo) & CenterDot; Io & CenterDot; 1.2288 & CenterDot ; 106 (chip / s) & CenterDot; RSSIW & CenterDot;. RW]]> soft handoff, the mobile station can detect a plurality of intensity greater than the active set addition of threshold T_ADD pilot, determination process see the following table 1 and table 2 schematically: tABLE 1

表2 Table 2

表1是前向初始发射功率和移动台接收到的导频强度一组对应值,其中,取 Table 1 is received before the initial transmission power of the mobile station and a corresponding set of pilot strength values, wherein, taking

M=-20·log(EcIo)=-2·(EcIo)dB,WR=128]]>Psend=Ppilot·10D+0.5M10·RW]]>表2是反向发射功率和基站测得的反向链路信号总强度RSSI的一组对应值,其中,取 M = -20 & CenterDot; log (EcIo) = - 2 & CenterDot; (EcIo) dB, WR = 128]]> Psend = Ppilot & CenterDot; 10D + 0.5M10 & CenterDot; RW]]> Table 2 is a reverse transmission power and the base station measured trans to a group corresponding to the total intensity value of the link RSSI signal, wherein, taking

Pr=(EbIo)BS·R·RSSIPr_loss·W≈(EbIo)BS·Ppilot_send·R(EcIo)·Io·1.2288·106(dhip/s)·RSSIW·RW.w=1.23Mbits/s.]]>表1、表2分别对应于各Ec/Io、反向负荷取值下,所需的前、反向初始发射功率数值表(假设业务为一固定速率的数据业务)。 Pr = (EbIo) BS & CenterDot; R & CenterDot; RSSIPr_loss & CenterDot; W & ap; (EbIo) BS & CenterDot; Ppilot_send & CenterDot; R (EcIo) & CenterDot; Io & CenterDot; 1.2288 & CenterDot; 106 (dhip / s) & CenterDot; RSSIW & CenterDot; RW.w = 1.23Mbits / s. ]]> tables 1 and 2 respectively corresponding to the Ec / Io, the reverse load value, required before the reverse transmission power initial value table (assuming a fixed rate for the traffic data services). 由表2可以看出相同导频强度时,不同的反向负荷下移动台的发射功率,反映了较差的导频强度和较重的反向负荷分别对系统性能的影响程度。 As can be seen from Table 2 the same pilot strength, transmit power of the mobile station at different reverse load reflects the pilot strength and poor reverse load heavier impact on system performance, respectively.

由表1可知对应于不同的接收导频强度,前向初始发射功率不同,为减小对前向负荷的增加,应选用接收导频强度较大的小区。 From Table 1 correspond to a different received pilot strength, initial transmission power to the various former, in order to reduce the load increases toward the front pair, should be used in a large pilot strength received pilot cells.

由表2可知对应于不同的反向信号总强度,反向发射功率不同,为减小对反向负荷的增加,在反向衰落相同时应选用反向信号总强度较小的小区。 Table 2 shows that correspond to different overall strength of the reverse signal, the reverse transmission power is different, in order to reduce the increase in the reverse load, use a smaller total inversion signal strength should reverse the decline in the same cell.

由于前反向发射功率是相对独立的,为了综合评价对系统的影响,采用了加权求和的方法,即:Es=αPf/Pf_max+βPr/Pr_max]]>其中Es是求出的系统性能优先值,由该值进行软切换时的小区选择,优选该值比较高的小区建立软切换分支。 Since the forward and reverse transmission power is relatively independent of the system in order to influence the comprehensive evaluation, the method using a weighted sum, i.e.: Es = & alpha; Pf / Pf_max + & beta; Pr / Pr_max]]> where Es is determined system performance priority value for a cell selection during soft handover from the value, which value is preferably relatively high to establish cell soft handover branch. Pf是前向初始发射功率,即基站所需的发射功率,这里假设是在理想功控的条件下。 Pf is a forward initial transmit power, i.e., the base station transmit power required, assumed here under conditions of ideal power control. Pr是反向发射功率,即移动台所需的发射功率。 Pr is the reverse transmission power, i.e., the mobile station transmission power required. Pf_max是前向给单个用户分配的最大发射功率,此处取系统全负荷且均为基本速率业务时,所以Pf_max可大致取为1瓦;Pr_max为反向最大发射功率,一般取为20毫瓦。 Pf_max is the maximum transmit power to a single user prior to distribution, where the whole system load and are taken when the basic rate service, so Pf_max may be substantially taken as 1 watt; Pr_max reverse maximum transmission power, is generally taken as 20 mW . α是一个正的权值,反映前向发射功率对系统性能的影响,β也是一个正的权值,反映反向发射功率对系统性能的影响。 α is a positive weights, transmit power to the impact on system performance, positive beta] is a front weights reflect, reflect the reverse transmission power impact on system performance. 此处取α=0.6,β=0.4,这两个权值可以根据系统实际业务对前反向容量的不同要求进行调整。 Here take α = 0.6, β = 0.4, the two weights can be adjusted according to the different requirements of the system before the actual business of the reverse capacity.

下面的表3是综合考虑前向 Table 3 below before considering the 和反向RSSI的影响下对小区的选择表3 And selecting a cell under the influence of the inverse RSSI Table 3 根据反向链路信号总强度RSSI计算反向初始发射功率,比较简单的估计了反向发射功率的稳定值,由于反向衰减量无法得到,是采用前向衰减量估计的,故估计值与实际值有一定偏差。 Calculating the initial transmission power in accordance with reverse reverse link signal strength of the RSSI total, a relatively simple and stable estimated value of the reverse transmission power, the amount of attenuation can not be obtained due to the reverse, before use to estimate the amount of attenuation, and therefore the estimated value some deviation from the actual value.

本发明的软切换方法采用现有的CDMA2000空中接口协议及相应结构,该方法便于实现且计算所用时间没有明显增加,所需要的参数和硬件现有CDMA2000系统都可以提供。 Soft handover method according to the present invention employs a conventional CDMA2000 air interface protocol and corresponding structures, which facilitates the elapsed time and calculates achieved without significantly increasing the required parameters and existing hardware can provide a CDMA2000 system. 经过数值计算得出的对应关系表1-表3证明所基于的思想是合理的,较之传统的切换方法而言,她可以有效地提高系统性能。 Obtained through numerical correspondence table 1 to Table 3 prove that is reasonable based on the idea, compared to the traditional switching method, she can effectively improve system performance. 通过上面的描述,本领域的技术人员不难在CDMA2000系统中实现这种结合反向负荷的软切换小区选择。 Through the above description, one skilled in the art will readily select such a soft-handover with reverse load cell in a CDMA2000 system.

Claims (7)

  1. 1.一种码分多址通信系统中移动台软切换小区方法,该方法基于码分多址系统,在该系统中,包括一个基站控制器,由该基站控制器控制的数个基站收发器,由移动台到激活的基站收发器的反向链路和由激活的基站收发器到移动台的前向链路,移动台以及各基站收发器均包括一个发射接收机,其特征在于该方法包括以下步骤:a,使移动台与该系统中的至少一个基站收发器建立业务信道,移动台周期性搜索使用频点上各基站收发器的导频;b,基站控制器根据移动台导频激活集中的导频数,确定激活集加入门限或激活集动态加入门限,并将激活集加入门限或激活集动态加入门限下发给移动台;c,移动台连续检测各基站收发器的导频强度并上报给基站控制器;d,基站控制器对移动台当前激活集里的导频数进行判断并将判断结果通过前向链路下发给移动 A CDMA mobile communication system in soft handoff cell, the method based on the CDMA system, the system comprising a base station controller, the base station controller is controlled by the number of base stations transceivers, activating by the mobile station to the base transceiver station and the reverse link by activated before the base transceiver station to the mobile station forward link, the mobile station and each base transceiver station includes a transmitter-receiver, characterized in that the method comprises the following steps: a, the mobile station to establish a traffic channel with the at least one base transceiver system, the mobile station periodically searches using each base transceiver station on a pilot frequency; B, base station controller activates the mobile station pilot frequency set the number of pilot, determining active set addition of a threshold or an active set dynamically added to the threshold, and the active set addition of a threshold or an active set dynamically added to the threshold to the mobile station; C, the mobile station continuously detects the respective base transceiver station pilot strength and reported to the base station controller; d, the base station controller to the mobile station is currently in the active set of the number of pilots and the determination result before the determination by the downlink to the mobile 和相关的基站收发器;e,基站控制器选择系统性能优先值Es低的小区从激活集里剔除或不予进入,再通过导频指配消息将选中的小区通知移动台,移动台根据基站控制器的指令建立与新小区的连接,执行完毕后再返回步骤a;f,以上步骤循环进行,直到移动台结束业务状态为止。 And associated base station transceiver; E, the base station controller to select the system performance low priority value Es cells in or removed from the active set not to enter, and then through a pilot assignment message to the selected cell notifies the mobile station, the mobile station according to base station a control instruction to establish a connection with the new cell, then processing returns to step finished a; f, the above cycle of steps until the state of the mobile station until the end of the business.
  2. 2.如权利要求1所述的码分多址通信系统中移动台软切换小区方法,其特征在于:所述的步骤b中,若移动台导频激活集中只有一个导频时,则基站控制器下发激活集加入门限T_ADD给移动台;若移动台导频激活集中有一个以上导频时,则基站控制器下发激活集动态门限T_ADD_DYC给移动台。 2. The CDMA communication system of claim 1 in a cell the mobile station soft handover method as claimed in claim, wherein: said step (b), if the mobile station Active Set pilot is only one pilot, the base station controller issued active set threshold T_ADD is added to the mobile station; if the mobile station Active set pilot has more than one pilot is made an active set dynamic threshold limit at the base station controller to the mobile station T_ADD_DYC.
  3. 3.如权利要求2所述的码分多址通信系统中移动台软切换小区方法,其特征在于:所述的激活集加入门限T_ADD值由系统设定,一般取-13db;所述的激活集动态加入门限T_ADD_DYC值根据公式T_ADD_DYC=max{(SOFT_SLOPEs/8)*10*log10Σi∈APSi+ADD_INTERCEPTs2,T_ADD/(-2)}]]>求出。 3. The CDMA communication system of claim 2 in the cell the mobile station soft handover method as claimed in claim, wherein: said added active set threshold values ​​T_ADD set by the system, and generally -13dB; the active set Add dynamic threshold value according to the formula T_ADD_DYC T_ADD_DYC = max {(SOFT_SLOPEs / 8) * 10 * log10 & Sigma; i & Element; APSi + ADD_INTERCEPTs2, T_ADD / (- 2)}]]> is obtained.
  4. 4.如权利要求1所述的码分多址通信系统中移动台软切换小区方法,其特征在于:所述的步骤c中,移动台连续检测各基站收发器的导频强度并上报给基站控制器是指当发现有导频强度大于激活集加入门限T_ADD或激活集动态加入门限T_ADD_DYC的导频时,通过导频强度测量报告消息将此导频上报给基站控制器。 4. The CDMA communication system of claim 1 in a cell the mobile station soft handover method as claimed in claim, wherein: said step c, the mobile station continuously detects the pilot strength of each base transceiver station and reports it to the base station controller It means that when is found greater than the Active set pilot strength threshold T_ADD is added to dynamically join or active set threshold T_ADD_DYC pilot, through the pilot strength measurement report message reporting this to the base station pilot controller.
  5. 5.如权利要求1所述的码分多址通信系统中移动台软切换小区方法,其特征在于:所述的步骤d中,基站控制器对移动台当前激活集里的导频数进行判断时,若导频数小于3时,则直接将新导频加入激活集中;若导频数大于等于3时,则根据公式Es=αPf/Pf_max+βPr/Pr_max]]>计算当前激活集中的导频和新导频的系统性能优先值Es,选出优先值最低的导频,若该导频是当前激活集中的,则从激活集中删除,若该导频是新导频,则拒绝加入激活集。 Cell in soft handoff, characterized in that the CDMA communication system according to claim 5. The mobile: when the step (d), the base station controller to the mobile station number of pilot in the current active set is determined, If the frequency of the derivative is less than 3, then directly to the new perch added active set; if the number of pilot is greater than or equal to 3 according to the equation Es = & alpha; Pf / Pf_max + & beta; Pr / Pr_max]]> calculating the current active set pilot frequency and the new pilot system performance priority value Es, the lowest value of the selected priority pilot, if the pilot is the current active set, deleted from the active set, if the pilot is a new pilot, then refused to join activated set.
  6. 6.如权利要求5所述的码分多址通信系统中移动台软切换小区方法,其特征在于:所述的公式 Of the formula: 6. The communication system of claim 5, wherein the CDMA mobile station requires a soft handover cell, characterized in that 中,移动台指定的前向初始发射功率Pf根据公式Pf=min[Ppilot_send·10D+0.5M10·RW,Pmax]]]>进行计算。 The mobile station specifies an initial forward transmission power according to the equation Pf Pf = min [Ppilot_send & CenterDot; 10D + 0.5M10 & CenterDot; RW, Pmax]]]> is calculated.
  7. 7.如权利要求5所述的码分多址通信系统中移动台软切换小区方法,其特征在于:所述的公式 The formula: 7. The communication system of claim 5, wherein the CDMA mobile station requires a soft handover cell, characterized in that 中,反向初始发射功率Pr根据公式 , The reverse initial transmission power according to the formula Pr 进行计算。 Calculation.
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CN100407809C (en) 2005-06-21 2008-07-30 华为技术有限公司 A short message paging method Location
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WO2009021414A1 (en) * 2007-08-14 2009-02-19 Huawei Technologies Co., Ltd. Handover method for shared channels, and apparatus and system thereof
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