CN103269508B - Access control method for a cellular network and a wireless LAN integration - Google Patents

Access control method for a cellular network and a wireless LAN integration Download PDF

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CN103269508B
CN103269508B CN201310134084.3A CN201310134084A CN103269508B CN 103269508 B CN103269508 B CN 103269508B CN 201310134084 A CN201310134084 A CN 201310134084A CN 103269508 B CN103269508 B CN 103269508B
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access
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user
cellular network
network
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CN103269508A (en
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方彬
范娟
张四海
周武旸
李磊
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中国科学技术大学
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Abstract

本发明公开了一种蜂窝网和无线局域网融合的接入控制方法,特征是通过区分用户物理层数据速率的差异,采用分段接入策略,并在考虑了业务模型、服务模型和移动模型的条件下,给出了接入域的计算方法,使得无线局域网中数据速率低的用户尽可能接入蜂窝网络,数据速率高的用户尽可能接入无线局域网,缓解了低数据速率用户的拖累效应,保证了用户的服务质量和提高系统吞吐量。 The present invention discloses a method for access control in a cellular network and a wireless LAN integration, characterized by differences in distinguishing physical layer data rate of the user using the access policy segment, and in consideration of the business model, service model and moving model under the conditions, the calculation method of the access domain, such that the low data rate wireless local area network access to the user as a cellular network, the high data rate wireless local area network access to the user as much as possible to alleviate the effects of drag on low data rate users ensure that the user's quality of service and improve the system throughput.

Description

-种蜂窝网和无线局域网融合的接入控制方法 - the access control method of a cellular network and a wireless LAN species fused

技术领域 FIELD

[0001] 本发明属于异构无线网络融合通信技术领域,特别设及蜂窝网和无线局域网融合的接入控制方法。 [0001] The present invention pertains to the integration of heterogeneous wireless network communication technologies, and particularly access control method is provided, and a cellular network and a wireless LAN integration.

背景技术 Background technique

[0002] 在无线局域网(WLAN)通信中,速率自适应是提高系统传输效率、增强业务服务质量(QoS)的重要方法,已经写入"国际电子电气工程师协会"(IE趾)802.11协议标准。 [0002] In the wireless LAN (WLAN) communications, transmission rate adaptation is to improve the efficiency of the system, an important method of quality of service (QoS) enhancements, has been written, "Institute of Electrical and Electronics Engineers' (IEs toe) 802.11 protocol standard. 如, IE邸802.1 la中,支持6Mpbs到54Mbps共八种物理层(P肌)数据速率,I趾E 802.1化支持1Mbps到11Mbps共四种物理层数据速率,而IE邸802.1 In支持超过15种物理层数据速率。 Such as, IE Di 802.1 la, the total of eight support 6Mpbs to 54Mbps physical layer (P muscle) data rate, support of the I E 802.1 toe to 1Mbps 11Mbps total four kinds of physical layer data rate, while IE Di support 802.1 In over 15 physical layer data rate. 《国际电子电气工程师协会移动算法汇刊》(IE邸Transactions on Mobile Computing, vol. l,no.4,pp. 278-292,2002)中给出结论:根据用户当前信道条件如信干噪比(SINR)动态地进行速率自适应,可W显著提高无线局域网吞吐量。 "Institute of Electrical and Electronics Engineers Transactions algorithm moves" (IEs Di Transactions on Mobile Computing, vol l, no.4, pp 278-292,2002..) Are given CONCLUSION: The current channel conditions, such as the user SINR (SINR) for dynamic rate adaptation, W can significantly increase the throughput of the wireless LAN.

[0003] 《计算机通信国际研讨会KIE邸INF0C0M Proc. June 2002,pp. 599-607)中给出了基于分布式协同(DCF)接入的无线局域网数据速率计算公式,根据该公式可W得出W下结论:随着无线局域网中低物理层数据速率用户增加,高物理层数据速率用户的服务速率和无线局域网的吞吐量会急剧减少。 [0003] "International Symposium on Computer Communication KIE Di INF0C0M Proc. June 2002, in pp. 599-607) gives Based Distributed Cooperative (DCF) access to a wireless LAN data rate formula, W can be obtained based on the formula the W Conclusion: as wireless LAN physical layer of low data rate users increase, the high rate physical layer data rate services and user WLAN throughput is drastically reduced.

[0004] 《国际电子电气工程师协会无线通信会刊》(IE趾Transactions on Wireless Communications, vol. 6 ,ηο . 5 ,ρρ. 1932-1952,2007)中提出的一种针对蜂窝网和无线局域网融合的接入策略,通过区分业务类型和采用限制接入来引导用户进行网络接入。 [0004] A "Institute of Electrical and Electronics Engineers wireless communication Proceedings" (IEs toe Transactions on Wireless Communications, vol. 6, ηο. 5, ρρ. 1932-1952,2007) fused proposed for cellular network and a wireless local area network access policy, and by using the service type distinguishing restricted access to guide the user network access. 该方法因不区分用户在无线局域网中的物理层数据速率,不同物理层数据速率的用户W相同的概率接入到无线局域网,从而导致整个系统的吞吐量和高物理层数据速率用户的服务速率急剧下降。 Because the method does not distinguish between physical layer data rate user in the wireless local area network, users in different physical layer data rates equal probability W access to a wireless local area network, resulting in a high overall system throughput and user's physical layer data rate service rate A sharp decline.

发明内容 SUMMARY

[000引本发明提供一种蜂窝网和无线局域网融合的接入控制方法,通过区分用户物理层数据速率的差异,采用分段接入策略,W提高系统吞吐量和用户服务质量。 [000 primer present invention provides a method for controlling access to a cellular network and a wireless local area network integration, by distinguishing user physical layer data rate difference, the use of sub-access policy, W improve the system throughput and user quality of service.

[0006] 本发明蜂窝网和无线局域网融合的接入控制方法,包括接入域的计算和接入网络选择;其特征在于:蜂窝网基站和无线局域网接入点按照下面给出的方法,离线计算出不同业务密度条件下的各种用户的接入域,制定出相应的查询表;然后按照下面的接入网络选择方法来引导用户的接入;分两部分来描述: [0006] The present invention is a cellular network and a wireless local area network access control method for fusion, including calculation and selecting an access domain access network; characterized in that: cellular network base stations and wireless LAN access points according to the methods given below, offline various users is calculated under different conditions traffic density access domain, develop appropriate look-up table; then, according to the following method for selecting an access network to guide the user access; described in two parts:

[0007] -、接入网络选择方法 [0007] - Access network selection method

[0008] 记仅有蜂窝网覆盖的区域为仅蜂窝网覆盖区域co(cell-only),同时被蜂窝网络和无线局域网覆盖的区域为重叠覆盖区域dc(double-coverage area),邻居蜂窝网所覆盖的区域为邻居蜂窝网区域nc,重叠覆盖区域dc又分成高数据速率模式覆盖区域下简称为第一区域)S1和低数据速率模式覆盖区域下简称为第二区域)S2;高数据速率模式或低数据速率模式分别由无线局域网中几个较高或较低的物理层数据速率模式组成,覆盖的区域由相应信干噪比(SINR)决定;记蜂窝网覆盖范围内,蜂窝网中最大的新用户接入数为,最大切换用户的接入数为Λς.胃;无线局域网覆盖范围内,接入无线局域网的第一区域S 1的最大用户接入数为,第二区域S 2的最大用户接入数为Λς胃;(的辦,礙:胃)即是接入域;接入算法分成W下四步: Region [0008] referred to only cellular network coverage for a cellular coverage area only co (cell-only), while the area covered by the cellular network and WLAN coverage area overlap dc (double-coverage area), the neighbor cellular network area cellular network coverage areas neighbor nc, overlapping coverage areas dc high data rate mode and into the coverage area referred to as a first region) S1 and the low data rate mode coverage area referred to as the second region) S2; high data rate mode the low data rate mode or a wireless local area network respectively higher or lower number of physical layer data rate mode composition, the area covered by a respective signal to interference noise ratio (SINR) determined by; remember the cellular network coverage, maximum cellular network new user access number, the maximum number of access for the user to switch Λς stomach; inner WLAN coverage, wireless local area network access to a first region S 1 of the maximum number of users is, the second region S 2 of maximum number of users is Λς stomach; (the office, hinder: the stomach) is the access domain; access algorithm is divided into four steps at W:

[0009] 接入算法第一步:通过对仅蜂窝网覆盖区域CO和重叠覆盖区域dc的用户到达密度的统计,确定仅蜂窝网覆盖区域CO和重叠覆盖区域dc用户到达速率λ-和λ",通过查找接入域表於"皿(乂",乂"'),WL,"x(八(乂",乂"'),~;;',,,。、仪%乂"')],确定当前的接入域 [0009] Step access algorithm: Through statistical user only CO and cellular coverage areas overlapping coverage areas dc reaches density cellular coverage areas determined only CO and overlapping coverage areas dc user arrival rate and λ- λ " by table lookup in the access domain "dish (qe," qe " '), WL," x (eight (qe, "qe"'), ~ ;; ',,,.,% qe meter' ")] determining a current access domain

[0010] 接入算法第二步:对于来自重叠覆盖区域dc的新到达用户和切换用户,首先选择无线局域网作为接入网络;如果当前无线局域网中用户数nw满足《w<iV^,则第一区域S1 的新用户和切换用户接入无线局域网;如果当前无线局域网中用户数η"满足η"'胃,则第二区域S2的新用户和切换用户可W接入无线局域网;如果不满足上述条件,则进行第Ξ 步; [0010] Step access algorithm: For a new user to reach the user and the switching dc from overlapping coverage areas, first select a WLAN access network; if the number of the current WLAN user nw satisfies "w <iV ^, the first a region S1 and new users access to a wireless local area network switch user; if the number of users in the current wireless LAN η "satisfies η" 'stomach, the second area S2 and the new user can switch the user access to the wireless LAN W; if not the above-described conditions are for the first step Ξ;

[0011] 接入算法第Ξ步:对于来自重叠覆盖区域dc的用户,如果不满足第二步中条件,贝U 选择接入蜂窝网络;如果蜂窝网络中的当前用户数ne满足# < ,则新到达用户接入到蜂窝网络,否则被阻塞;如果满足《6 < ,则切换用户接入到蜂窝网络,否则被掉线; [0011] Step Ξ access algorithm: For the user from a dc overlapping coverage areas, and the second step if the condition is not satisfied, U shellfish selected cellular network; if the current number of users in a cellular network satisfies ne # <, then newly arrived user access to a cellular network, or is blocked; If the condition "6 <, switch the user access to the cellular network, otherwise it is dropped;

[0012] 接入算法第四步:对于来自仅蜂窝网覆盖区域CO的用户,如果蜂窝网络中的当前用户数ne满足。 [0012] The fourth step access algorithm: For cellular coverage area only from CO user, if the current number of users in a cellular network to meet ne. 则新到达用户接入到蜂窝网络,否则被阻塞;如果蜂窝网络中的当前用户数护满足心< ,则切换用户接入到蜂窝网络,否则被掉线; The newly arrived user access to a cellular network, or is blocked; if the current number of users in a cellular network to meet the heart protecting <, switch the user access to the cellular network, otherwise it is dropped;

[0013] 二、接入域的计算;接入域的计算分成六步进行,在网络系统实施前,离线算出接入域与业务密度(λ™,λ")的对应表; [0013] Second, calculate the access domain; calculating an access domain into six steps carried out prior to the implementation of the network system, calculates the off-line access domain and traffic density (λ ™, λ ") correspondence table;

[0014]接入域第一步:对于每组业务密度(Ae°,Aw),遍历接入域[W;視(;r,;r),;vu(尸,;r),W畐(乂",;0,心(;r,;n]的非负整数取值; [0014] Step access domain: For each set of traffic density (Ae °, Aw), traversing the access domain [W is; view (; r,; r) ,; vu (dead,; r), W Bi ( qe "; 0, the heart (; r,; n] of non-negative integer value;

[001引接入域第二步:对于每一个接入域遍历值(W胃,),计算无线局域网中的延时和阻塞率;过程如下: [Step 001 access domain primers: for each traverse the access domain value (W stomach), wireless local area network is calculated blocking probability and delay; follows:

[0016] 设无线局域网的状态为(巧"',鮮),分别表示第一区域S1和第二区域S2中接入无线局域网的用户数,则状态转移的无穷小矩阵为: [0016] The set status of the wireless LAN (clever " ', fresh), represent the first region S1 and the area S2 of the second wireless LAN access users, infinitesimal the state transition matrix is:

[0017] [0017]

Figure CN103269508BD00101

[0018] 其中的Ξ个中间变量矩阵第一中间变量矩阵B、第二中间变量矩阵D和第Ξ中间变量矩阵E分别表不如下: [0018] wherein the intermediate variable matrix Ξ first intermediate variable matrix B, a second intermediate variable matrix D and E are each matrix Ξ intermediate variables not following table:

Figure CN103269508BD00111

[0024] 第一中间变量W = 胃,第二中间变量M = ^,為w和分别为第一区域SI 和第二区域S2中的用户到达率 [0024] The first intermediate variable W = stomach, the second intermediate variable M = ^, w, and reach the user are a first region and a second region SI S2 is

Figure CN103269508BD00112

si和s2分别为第一区域S1 和第二区域S2的面积;為和省分别为第一区域S1和第二区域S2中接入蜂窝网络的用户切换到无线局域网的速率,Λ品和%是无线局域网中用户从第一区域S1移动到第二区域S2,和从第二区域S2移动到第一区域S1的转移速率,将在第四步中计算; si and s2 are the area of ​​the first region S1 and the second region S2; respectively for the provinces and a first region S1 and the second user area S2 cellular network to switch to the rate of the wireless LAN, Λ% product and are WLAN user moves from the first area S1 to the second area S2, and the calculated moved from the second region S2 to the transfer rate of the first region S1 in the fourth step;

[0025] 从片7')和//并J)分别为第一区域S1和第二区域S2用户在无线局域网中的服务速率. [0025] From the sheet 7 ') and the // and J) respectively, a first region S1 and the area S2 of the second user service rate in a wireless LAN.

[0026] 记状态的",<)的稳态概率为n=(>日,:πl,JT2,···,JTN),:πn=(>w(n,0),πW(n,l),…,πW (n,M)),则稳态概率的表达式为 [0026] The state of mind ", <steady-state probability) for n = (> day,: πl, JT2, ···, JTN) ,: πn = (> w (n, 0), πW (n, l ), ..., πW (n, M)), the expression for the steady-state probability

Figure CN103269508BD00113

[0030] 则第一区域S1和第二区域S2用户在无线局域网中的阻塞率分别为: [0030] the first region S1 and the area S2 of the second user in the wireless local area network blocking rate are:

[0031] [0031]

Figure CN103269508BD00114

[0032] 则无线局域网的延时均值为: [0032] the wireless local area network delays mean:

[0033] [0033]

Figure CN103269508BD00121

[0034] 接入域第立步:对于每一个遍历值胃^,W.|胃,Λς'胃),计算蜂窝网络中的阻塞率、掉线率和延时,过程如下: [0034] Li the first step the access domain: value for each traversal stomach ^, W | stomach, Λς 'stomach), the blocking rate calculation in a cellular network, dropped calls and the delay, as follows:

[0035] 记蜂窝网络的状态为Κ,.啼.吃')·分别表示起源于仅蜂窝网覆盖区域CO,第一区域S1,第二区域S2,并一直接入到蜂窝网的用户数;则各个状态之间的转移速率表示如下: Status [0035] referred to as a cellular network Κ ,. cry eat ') - represent the only cellular originated in the coverage area of ​​CO, the first area S1, the second region S2, and the number of users has access to the cellular network.; transfer rate between the respective states as follows:

Figure CN103269508BD00122

[0049] 其中,%分别为邻居蜂窝网小区到本小区的切换速率和无线局域网切换到仅蜂窝网覆盖区域CO的速率,Φ,W为逗留时间矩生成函数,临时符号变量X可代表符号CO、S1、S2,将在第四步计算; [0049] wherein% respectively neighbor cellular network cell to the switching rate of the cell and the wireless LAN switch to a rate just cellular coverage area of ​​CO, Φ, W is the residence time moment generating function, a temporary variable symbols X may represent a symbol CO , S1, S2, calculated in the fourth step;

[0050] 蜂窝网用户服务速率为 [0050] The cellular subscriber service rate

Figure CN103269508BD00123

护为蜂窝网总带宽,fd 是业务的平均数据尺寸; Support for the total bandwidth cellular network, fd is the average size of the data traffic;

[0051] 记接入蜂窝网的用户数为沁=嫣+靖+鴻,则蜂窝网中用户数η。 Number of users [0051] access to the cellular network referred to as Qin = + Hong Jing Yan +, the number of users in a cellular network η. 的分布概率为 The probability distribution

[0052] [0052]

Figure CN103269508BD00131

[0058] 接入域第四步:逗留时间矩函数和切换速率的计算; [0058] The access domain fourth step: calculation of residence time and the moment the switching rate function;

[0059] 用户在蜂窝网中位置状态的转换及其概率描述如下:仅蜂窝网覆盖区域CO中接入蜂窝网的用户,当离开仅蜂窝网覆盖区域CO时,W转移概率护进入第二区域S2, W转移概率pc-=i-pc-进入邻蜂窝网;进入第一区域S1过程中,W概率擊'(即无线局域网中第二区域S2的阻塞率)仍然接入蜂窝网络,的概率接入无线局域网;第二区域S2中接入蜂窝网的用户离开第二区域S2时,W转移概率pW进入第一区域S1,W转移概率进入仅蜂窝网覆盖区域CO,进入第一区域S1的过程中,W概率辟'仍然接入蜂窝网,W概率1-聲切换到无线局域网;对于第一区域S1接入蜂窝网的用户离开第一区域S1时,W概率心'保持接入蜂窝网,W概率1-马"切换到无线局域网;给出仅蜂窝网覆盖区域CO、第一区域S1、第二区域S2用户驻留时间的矩生成函数分别为: [0059] and converting the user position state probability cellular network is described as follows: the user only cellular coverage area of ​​a cellular network access to the CO, when leaving the coverage area of ​​the cellular network only CO, W is the probability of transition into the second guard region S2, W transition probabilities pc- = i-pc- off adjacent cellular network; probabilistic process enters the first area S1, W hit probability '(i.e., the second area S2 WLAN blocking rate) is still access the cellular network, the WLAN access; the user of the cellular network access to the second area S2 away from the second region S2, W pW transition probability into the first zone S1, W transition probability into the coverage area of ​​a cellular network only CO, into the first area S1 process, W is the provision of a probability 'still access the cellular network, W acoustic probability 1- switched to wireless LAN; the first region S1 when the user leaves the cellular network access to a first region S1, W probability heart' remains access the cellular network , W probability 1- horse "switch to a wireless local area network; only given cellular coverage area of ​​CO, the first area S1, the second area S2 user dwell time moment generating function are:

Figure CN103269508BD00132

[0063]其中,各个参数的含义说明:7Γ表示用户在CO区域的驻留时间,if表示用户在S1 区域的驻留时间,7;"表示用户在S2区域的驻留时间,中间变量rT表示ΖΓ均值的倒数,中间变量rfi表示於咱值的倒数,中间变量rf嗦示护2均值的倒数。a表示高移速和低移速用户的比例调节因子。 [0063] wherein the meaning of each parameter described: 7Γ represents CO user residence time zone, the user IF represents residence time S1 region, 7; "S2 represents the residence time in the user area, represented by the intermediate variable rT ΖΓ reciprocal of the mean, represented by the reciprocal of the intermediate variable rfi we value, the intermediate variable rf winded guard 2 shows the mean reciprocal .a high ratio indicates a low moving speed and the moving speed of the user adjustment factor.

[0064] 记逗留时间的矩生成函数为(句,起源区域符号变量XI表示用户起源区域, 取值集合为^〇,51,52,11(3},目的区域符号变量^2表示用户的目的区域,取值集合为^〇, Sl,S2,nc},条件符号变量con可W取值终止条件符号term、一直处于并终止于重叠覆盖区域条件符号dc_term或转移条件符号tran,分别表示由于切换到无线局域网或者邻蜂窝网而终止于目的区域(由目的区域符号变量x2代表的区域),一直在重叠覆盖区域dc内运动并且终止于目的区域或第一次转移到目的区域;因此逗留时间的矩生成函数为表示用户起源于起源区域(由起源区域符号变量XI代表),按照条件符号变量con所代表的条件而到达目的区域(由目的区域符号变量x2代表)之前所逗留时间的矩生成函数;逗留时间矩生成函数巧表示用户起源于第二区域S2,在第一次运动到仅蜂窝网覆盖区域CO之前 Moment Generating Function [0064] referred to as residence time (sentence, the origin of the region XI symbolic variables representing the user origin region value set as square ^, 51,52,11 object (3}, object region symbolic variables representing the user's ^ 2 region, a set of values ​​of ^ square, Sl, S2, nc}, the condition may be con symbolic variables W termination condition value symbol term, has been in and terminates in overlapping coverage areas or a transition condition symbol dc_term Tran symbols, respectively, since the switching ortho to the wireless LAN or cellular network to terminate at a target region (target region by the region represented by the symbol variable x2), has been in the region of overlapping coverage dc moving object region and terminating at first transferred to the object or area; therefore stay in moment generating function indicating the user originates from the origin region (represented by the origin region symbolic variable XI), under the condition the condition variable symbols con represent reaches the moment generating function object region (represented by object region signed variable x2) before the time of stay ; Qiao stay moment generating function indicating the user originates from the second area S2, just before the cellular coverage area in the first movement to CO 逗留时间的矩产生函数,为 Moment generating function of time of stay for the

[0065] [0065]

Figure CN103269508BD00141

[0066] 类似于上面公式的推导,可W导出几种逗留时间矩生成函数Φ^Ι!.,,, Φ,:™。 [0066] Like the above derived formulas can be derived in several W stay Moment Generating Function Φ ^ Ι ,,, Φ,:!. ™. ',咬品;"和史二:尸如下: 'Bite products; "and the history of two: dead follows:

Figure CN103269508BD00142

) )

[0072]记矩产生函数为起源于由起源区域符号变量XI代表的起源区域,而终止于本蜂窝网覆盖范围所逗留时间的矩产生函数;可W导出几种矩产生函数φς"(句、汾和捉L的的表达式为: [0072] generation function referred to as the moment origin region originated by the originating variable region represented by symbol XI, terminate at the present moment cellular coverage generation function of the time of stay; W may be derived in several moment generating function φς "(sentence, Fen catch expressions and L as follows:

Figure CN103269508BD00143

[0075] [0075]

Figure CN103269508BD00151

[0076] 定义蜂窝网络切换概率为巧表示接入蜂窝网且起源于由起源区域符号变量XI代表的起源区域切换到由目的区域符号变量x2代表的目的区域并接入其他网络(无线局域网和邻蜂窝网络)的概率;则起源于仅蜂窝网覆盖区域CO的用户由当前蜂窝网络切入到邻居蜂窝网络的概率为 [0076] defines the cellular network to switch the access probability of coincidence represented by the cellular origin and the origin of the region representative of symbol variable XI is switched to the region of origin is represented by the symbol variable x2 object region and object region access to other networks (WLAN and o probabilistic cellular network); it originated in the coverage area of ​​the cellular network only CO cut by the user to the current cellular network to the cellular network neighbor probability

[0077] [0077]

Figure CN103269508BD00152

[0078] 起源于第二区域S2的用户,切入到第一区域S1并接入到无线局域网的概率为: [0078] originated from the user of the second region S2, S1 and cut into a first region wireless LAN access probability is:

[0079] [0079]

Figure CN103269508BD00153

[0080] 类似地,可W导出其他几种网络切换概率思f ji、好f心、巧f-®、和' "的表达式为 [0080] Similarly, W derive several other network switching probability thinking f ji, f good heart, clever f-®, and the expression '' is

Figure CN103269508BD00154

[0086] 定义接入无线局域网的用户,由第一区域S1切换到第二区域S2,并仍然接入到无线局域网的概率为: Probability [0086] define an access user wireless LAN is switched from the first area S1 to the second area S2, and still access the wireless local area network is:

[0087] [0087]

Figure CN103269508BD00155

[0088] 定义接入无线局域网的用户,由第二区域S2切换到第一区域S1,并仍然接入到无线局域网的概率为: [0088] define an access user wireless LAN is switched from the first region to the second region S2 Sl, and still access the wireless local area network is the probability:

[0089] [0089]

Figure CN103269508BD00161

[0090] 无线局域网中的用户,切换到蜂窝的概率为 [0090] The user of the wireless LAN, the probability of switching to cellular

[0091] [0091]

Figure CN103269508BD00162

[0092] 其中蜂窝网的平局服务速率为 [0092] wherein a draw rate of service for the cellular network

Figure CN103269508BD00163

,无线局域网平均服务速率为 Wireless LAN average service rate

Figure CN103269508BD00164

则切换到达率为: Arrival rate is switched:

Figure CN103269508BD00165

[0099] 接入域第五步:反复运行第二步到第四步,使得各个切换概率值收敛,并且保存收敛后的无线局域网和蜂窝网络的延时; [0099] Access Domain fifth step: a fourth step to the second step operation is repeated, so that the respective switching probability values ​​converge, and the delay WLAN and cellular network convergence after storage;

[0100] 接入域第六步:遍历完所有接入域胃,胃)取值集合后,按下面两个条件寻求最优接入域; [0100] Access Domain sixth step: After traversing all the access domain stomach, stomach) the set of values, according to the following two conditions for finding the optimal access domain;

[0101] 第一个条件:找到使得蜂窝网络阻塞率r小于阻塞率要求(Bteq),并且蜂窝网络掉线率r小于掉线率要求(护69)的接入域集合;如果集合为空,说明当前业务密度(λ-, λ")条件的接入域不在遍历值集合内,需要调整遍历值的范围; [0101] The first condition: found that the cellular network blocking probability is less than the blocking probability requirements r (BTEQ), and the cellular network is less than the drop rate r dropping rate requirement (guard 69) a set of access domain; if the set is empty, DESCRIPTION current access domain traffic density (λ-, λ ") condition value is not within the set of traversal, traverse to adjust the range of values;

[0102] 第二个条件:在满足第一个条件的接入域集合中,选择使得如下加权延时最小的接入域作为当前业务密度(λ™,λ")的最优接入域;加权延时为: [0102] The second condition: the access domain in a set of first condition is satisfied, the minimum delay selected such that the following weighted access domain as the current traffic density (λ ™, λ ") of the optimal access domain; weighted delay is:

[0103] [0103]

Figure CN103269508BD00166

[0104] 与现有的蜂窝网络和无线局域网融合的接入策略相比,本发明方法由于考虑了由信道条件不同而导致的用户在无线局域网中物理层数据速率的差异,通过对接入域的最优选择,在保障用户阻塞率、掉线率和延时等服务质量的条件下,无线局域网中低物理层数据速率用户尽可能地接入到蜂窝网络,而高物理层数据速率用户尽可能地接入无线局域网, 有效缓解了低物理层数据速率用户对其它用户服务速率和无线局域网容量的拖累效应,从而提高了用户的服务质量和系统的吞吐量。 [0104] Compared with the existing access policy cellular network and WLAN fusion, a method of the present invention in consideration of channel conditions of different users caused by the difference in the physical layer data rate wireless local area network, through an access domain the optimal choice, at the user quality of service guarantee blocking rate, delay and the like dropped calls, low WLAN physical layer data rate user as access to the cellular network, and the high physical layer data rate users do possibly the wireless LAN access, the physical layer to effectively alleviate the low data rate users drag effect on other users and wireless LAN service rate capacity, thereby improving the user's throughput and quality of service the system.

附图说明 BRIEF DESCRIPTION

[0105] 图1为本发明蜂窝网络和无线局域网分段接入策略示意图。 [0105] FIG 1 the cellular network and WLAN access segmentation strategy schematic diagram of the present invention.

[0106] 图2为本发明用户在蜂窝网覆盖和无线局域网覆盖区域位置状态转换示意图。 [0106] FIG. 2 of the present invention cover the status of the user location area cellular network and WLAN coverage schematic conversion.

[0107] 图3为本发明具体实施的网络构架示意图。 [0107] FIG. 3 shows a specific embodiment of the present network architecture of the present invention.

[0108] 图4为重叠覆盖区域(dc)吞吐量随着仅蜂窝网覆盖区域山〇)区域业务密度变化的对比示意图。 [0108] FIG. 4 is a coverage area overlap (dc) as the only certain cellular coverage area mountain square) Comparative schematic zone traffic density change.

[0109] 图5为重叠覆盖区域(dc)吞吐量随着业务稳健尺寸变化的对比示意图。 [0109] FIG. 5 is a schematic comparison overlapping area size change operations steady (dc) with a certain coverage.

[0110] 下面结合附图和实施例对本发明作进一步详细说明。 Drawings and embodiments of the present invention will be further described in detail [0110] below in conjunction.

具体实施方式 Detailed ways

[0111] 实施例1: [0111] Example 1:

[0112] 图3给出了本发明具体实施的网络构架示意图。 [0112] Figure 3 shows a schematic view of a particular embodiment of the network architecture of the present invention. 蜂窝网络和无线局域网采取松禪合结构,蜂窝网基站(ST)和无线局域网发射点(AP)进过光纤(OF 1,0F2,0F3,0F4)连接到主干网(BB)的网关上(GT1,GT2),它们之间可W通过主干网(BB)进行通信来协同。 Over a cellular network and a wireless local area take loose Zen laminate structure, a cellular network base station (ST) and the wireless LAN transmission point (AP) into an optical fiber through (OF 1,0F2,0F3,0F4) connected to the backbone network (BB) gateway (GT1 , GT2), communicate between themselves to synergistic W backbone network (BB). 移动台(MT1,MT2,MT3)是多模终端,可W接入蜂窝网和无线局域网,但任一时刻只能接入一个网络,并在仅蜂窝网覆盖区域ko)、第一区域(S1)、第二区域(S2)及邻蜂窝网络覆盖区域内不断移动。 The mobile station (MT1, MT2, MT3) is a multi-mode terminal, W may access the cellular network and wireless LAN, but at any one time can only access a network, and only in the coverage area of ​​the cellular network Ko), a first region (S1 ), the second region (S2) and adjacent coverage area cellular network constantly moving. 考虑无线局域网采用IEEE802.11a标准。 Consider using IEEE802.11a wireless LAN standard. 本实例中考虑下行业务传输。 This example consider downlink traffic transmission. 受无线局域网接入点功率的限制和信道衰落的影响,无线局域网覆盖范围内,信号强度随着离无线局域网发射点的距离增加而递减。 Affected by the wireless LAN access point power limit and channel fading, the coverage of the wireless LAN signal strength with increasing distance from the emission point of the wireless LAN decremented. 导致不同物理层数据速率模式的覆盖成环状分布,越接近发射点,物理层数据速率越高。 Resulting in different physical layer data rate mode covering an annular distribution, the closer to the launch point, the higher physical layer data rate. IEEE 802.1 la的物理层数据速率模式与信噪比口限的对应关系如下表1中所示: IEEE 802.1 la mode physical layer data rate and SNR limit port correspondence relationship shown in Table 1 below:

[0113] 表1仿真参数表 [0113] Table 1 Simulation Parameters

[0114] [0114]

Figure CN103269508BD00181

[0115] 本实施例考虑室外无线局域网场景,采用C0ST231-化ta传播模型来模拟信道衰减,给出衰减公式为 [0115] The present embodiment considers the scenario outdoor wireless LANs using C0ST231- model to simulate the propagation of ta channel attenuation, the attenuation given formula

[0116] 化(dB) =46.3+33.91ogiof-13.821ogi 曲ta(Hr) + (44.9-6.551ogi 地t) logiod+Cm [0116] of (dB) = 46.3 + 33.91ogiof-13.821ogi curved ta (Hr) + (44.9-6.551ogi ground t) logiod + Cm

[0117] 其中a(化)=3.2(l〇gi〇11.75化)2-4.97^表示无线局域网的工作频率,单位为兆赫兹(MHz),化为无线局域网发射点相对于地面的高度,单位为米(m),化是用户终端(肥)的高度,d是无线局域网发射点和用户终端的水平距离,Cm=3对应密集城区模型。 [0117] where a (oriented) = 3.2 (l〇gi〇11.75 of) 2-4.97 ^ indicates the WLAN operating frequency in megahertz (MHz), into a WLAN transmission point with respect to the ground level, the unit meters (m), the height of the user terminal (fat), d is the emission level of the wireless LAN distance point and user terminal, Cm = 3 corresponding to dense urban model.

[0118] 在本实施例中,设化=30m,化=Im,发射天线增益为4地,接收天线增益为2地,发射点的传输功率为0.抓。 [0118] In the present embodiment, the set of = 30m, of = Im, 4 transmitting antenna gain, the gain of the reception antenna 2, the transmission power emission point 0. catch. 通过计算,结合表1的信噪比口限,给出各个模式的覆盖半径为:山=142m,d2 = 125m,d3 = 102m,(k = 90m,d日=74m,ds = 53m,d? = 46m,ds = 38m。将模式1 和模式2 设定为低PHY速率,其他6个模式设定为高PHY速率,其覆盖部分分别设定为低速率覆盖SI和高速率覆盖S2,各自归一化的面积分别为si = 0.516,s2 = 0.484。W各个速率覆盖的面积为比例拟合出低PHY数据速率为R2 = 7.6Mbps,高PHY数据速率为R1 = 26.31Mbps。 By calculation, in conjunction with Table 1 SNR port limit given coverage radius of the respective modes: mountain = 142m, d2 = 125m, d3 = 102m, (k = 90m, d day = 74m, ds = 53m, d? = 46m, ds = 38m. mode 1 and mode 2 will be set to a low rate PHY, the other six patterns the PHY rate is set high, which cover portion covering the SI and are set to cover a high rate to a low rate S2, return to their own of area are a si = 0.516, s2 = 0.484.W area coverage for each rate ratio lower fitting PHY data rate R2 = 7.6Mbps, high data rate PHY R1 = 26.31Mbps.

[0119] 考虑用户在重叠覆盖区域dc移动模式为非均匀运动,驻留时间(1^)服从超指数分布。 [0119] In consideration of user movement pattern overlapping coverage areas dc non-uniform motion, dwell time (^ 1) obey the exponential distribution over. 相应地,设定用户在第一区域S1和第二区域S2运动模式与重叠覆盖dc区域一致,驻留时间(If,If )也服从超指数分布。 Accordingly, the user is set in the first region S1 and the area S2 of the second movement pattern consistent with overlapping coverage areas dc, residence time (If, If) are also subject to super-exponential distribution. 给出其概率密度函数为 Probability density function is given by

[0120] [0120]

Figure CN103269508BD00191

[0。1]其中,^和^分别为Γ0.,17哺的均值。 [0.1] where, ^ and ^ are Γ0., 17 feeding mean.

[0122] 设用户在重叠覆盖区域dc均匀分布,因此有当S2区域用户发生切换时,切换到CO 区域的概率天 [0122] When the user is provided overlapping coverage areas dc evenly distributed, so there occurs when a user switches S2 region, the probability of switching to the region day CO

Figure CN103269508BD00192

[0123] 设在各区域的移动,已经达到统计平衡,则有:(l)sl · rfi = s2 · If2 · p2-i,表示第一区域SI和第二区域S2之间用户移动达到统计平衡;(2)(sl+s2) · rT = s2 · If2 · Ρ2Λ表示用户从第二区域S2移动到仅蜂窝网覆盖区域CO的速率和由重叠覆盖区域dc内用户区域移动到仅蜂窝网覆盖区域CO的速率相同。 [0123] provided in each moving area, statistical equilibrium has been reached, there are: (l) sl · rfi = s2 · If2 · p2-i, indicating that the user moves to reach statistical equilibrium between the first region and the second region S2 SI ; (2) (sl + s2) · rT = s2 · If2 · Ρ2Λ rate indicates that the user within the coverage area covered by the CO and the dc overlapping area to the user area of ​​the mobile cellular network coverage area only moved from the second region S2 only to the cellular network CO same rate.

[0124] 因此可W导出 [0124] W can thus be derived

Figure CN103269508BD00193

[012引考虑用户在仅蜂窝网覆盖区域CO运动为均匀运动,因此驻留时间C IT)服从指数分布,平均驻留时间为 [012 primer only consider the user in the coverage area of ​​the cellular network motion CO uniform motion, so the residence time C IT) exponential distribution, the mean residence time of

[0126] 考虑单个包投递业务,业务文件尺寸(Ld)服从指数分布,均值为fd。 [0126] Consider a single packet delivery services, service file size (Ld) is exponentially distributed with mean fd.

[0127] 考虑无线局域网采用基于分布式竞争协同(DCF)的接入机制,采用请求发送/允许发送协议(RTS/CTS)的握手机制。 [0127] Consider use of the wireless LAN based distributed contention access mechanisms cooperative (DCF), the use of Request to Send handshake mechanism / protocol allowed to send (RTS / CTS) is. 可W得出无线局域网的物理层传输速率为(包/时隙): W may be derived wireless LAN physical layer transmission rate (packets / slot):

[012 引 [012 Cited

Figure CN103269508BD00194

[0129] 其中,m和Π 2为接入无线局域网中第一区域S1和第二区域S2区域的用户数。 [0129] wherein, m and Π 2 is a wireless LAN users can access the first region S1 and the second region S2 region. 功和巧分别为第一区域S1和第二区域S2用户传输一帖的平均时间, Qiao and respectively a first work region S1 and the second transmission area S2 average time a user posts,

Figure CN103269508BD00195

Figure CN103269508BD00196

其中TwntrDl为传输一帖的控制时间开销, Wherein TwntrDl to transmit a control time overhead posts,

Figure CN103269508BD00197

L为一帖中的有效载荷。 L is the payload of a quote. 为退避窗口的平均值,为冲突传输的平均时间。 It is the average backoff window, the average time for the transmission of the conflict.

[0130] 在网络实施之前,按照下述步骤离线计算出各种业务到达密度状态(λ-, λ")对应的接入域表W課(乂…,义…墜(义。,义脈u-,l"'),w;臟(义化,义可。 [0130] Before the network embodiment, according to the following steps to calculate the various traffic arrives offline state density (λ-, λ ") corresponding to the access domain table W section (qe ..., ... fall Yi (Yi., Yi pulse u -, l " '), w; dirty (the sense of, can sense.

[0131] 接入域第一步:对于每组业务密度(λκ°,λ"),遍历接入域[W,;'.皿心…,乂"'),心",乂"'),皿心m U"')]的非负整数取值; [0131] Step access domain: For each set of traffic density (λκ °, λ "), traversing the access domain [W ,; 'heart dish ..., qe."'), Heart, "qe" '), dish heart m U " ')] a non-negative integer value;

[0132] 接入域第二步:对于每一个接入域遍历值胃,辦,胃,iVJ胃),计算无线局域网中的延时和阻塞率;过程如下: [0132] Step access domain: For each value of the access field traversing the stomach, do, stomach, stomach IVj), wireless local area network is calculated blocking probability and delay; follows:

[0133] 设无线局域网的状态为的%斯,分别表示第一区域S1和第二区域S2中接入无线局域网的用户数,则状态转移的无穷小矩阵为: [0133] The set status of the wireless LAN% Si, respectively represent a first region S1 and the area S2 of the second wireless LAN access users, infinitesimal the state transition matrix is:

[0134] [0134]

Figure CN103269508BD00201

[0135] 其中的Ξ个中间变量矩阵第一中间变量矩阵B、第二中间变量矩阵D和第Ξ中间变量矩阵Ε分别表示如下: [0135] wherein the intermediate variable matrix Ξ first intermediate variable matrix B, a second intermediate variable matrix D and the matrix Ξ Ε intermediate variables are expressed as follows:

Figure CN103269508BD00202

[0141] 第一中间变量W = ,第二中间变量,Λ"'和^:"分别为第一区域S1 和第二区域S2中的用户到达率, [0141] The first intermediate variable W =, the second intermediate variable, Λ " 'and ^:" user reaches respectively the first region S1 and the second area S2,

Figure CN103269508BD00203

si和s2分别为第一区域S1 和第二区域S2的面积;1Γ1和我4分别为第一区域S1和第二区域S2中接入蜂窝网络的用户切换到无线局域网的速率,^品和為':,是无线局域网中用户从第一区域S1移动到第二区域S2,和从第二区域S2移动到第一区域S1的转移速率,将在第四步中计算; si and s2 are the area of ​​the first region S1 and the second region S2; 1Γ1 and I 4 respectively the second user of the first region S1 and the area S2 of the cellular network to switch to the rate of the wireless LAN, and to products ^ ':, a wireless local area network users, and will be calculated in the fourth step from the mobile first region to the second region S2 S1 S2 from the second region to move the transfer rate of the first region S1;

[0142] //,"'(/,刀和片;'化·/)分别为第一区域S1和第二区域S2用户在无线局域网中的服务速率. [0142] //, ' "(/, knives and substrate;' of * /) are a first region S1 and the area S2 of the second user service rate in a wireless LAN.

[014引记状态(皆,培)的稳态概率为3T=(JT0,JTi,JT2, . . .,JTN),JTn=0w(n,0),3TW(n,l),.'',3rW (11,1)),则稳态概率的表达式为井'=(0''.如|.0、,其中 [014 referred cited state (both, training) steady state probability of 3T = (JT0, JTi, JT2,..., JTN), JTn = 0w (n, 0), 3TW (n, l) ,. '' , 3rW (11,1)), the expression for the steady-state probability wells' = (0 '' as |. .0 ,, wherein

[0144] [0144]

Figure CN103269508BD00204

[0145] 则第一区域S1和第二区域S2用户在无线局域网中的阻塞率分别为: [0145] the first region S1 and the area S2 of the second user in the wireless local area network blocking rate are:

Figure CN103269508BD00211

[0149] 接入域第Ξ步:对于每一个遍历值(W;.胃,W;'.胃,W.胃,W]1.'胃),计算蜂窝网络中的阻塞率、掉线率和延时,过程如下: [0149] The first access domain Ξ step: For each traversal value (; '... The stomach, W stomach, W] 1' W ;. stomach, W stomach), the blocking rate is calculated in a cellular network, dropped calls and delay, as follows:

[0150] 记蜂窝网络的状态为(请,<,<),分别表示起源于仅蜂窝网覆盖区域CO,第一区域S1,第二区域S2,并一直接入到蜂窝网的用户数;则各个状态之间的转移速率表示如下 Status [0150] referred to as a cellular network (see, <, <), respectively originated only CO.'S cellular coverage area, the first area S1, the second region S2, and the number of users has access to the cellular network; the transfer rate between the respective states as follows

Figure CN103269508BD00212

[0164] 其中,ΑΓ,分别为邻居蜂窝网小区到本小区的切换速率和无线局域网切换到仅蜂窝网覆盖区域CO的速率,Φ,刮为逗留时间矩生成函数,临时符号变量X可代表符号CO、S1、S2,将在第四步计算; [0164] wherein, alpha] [gamma, respectively neighbor cellular network cell to the switching rate of the cell and the wireless LAN switch to a rate just cellular coverage area of ​​CO, [Phi], scraping to stay moment generating function, a temporary variable symbols X may represent a symbol CO, S1, S2, calculated in the fourth step;

[0165] 蜂窝网用户服务速率为σ为蜂窝网总带宽,fd 是业务的平均数据尺寸; [0165] cellular subscriber service rate for the total bandwidth σ a cellular network, fd is the average size of the data traffic;

Figure CN103269508BD00213

[0166] 记接入蜂窝网的用户数为味。 Number of users [0166] access to the cellular network referred to taste. +<+";',则系统中用户数ne的分布概率为 + <+ ";", A probability distribution of the number of users the system is ne

[0167] [0167]

Figure CN103269508BD00221

[0173] 接入域第四步:逗留时间矩函数和切换速率的计算; [0173] The fourth step access domain: stay and a switching function calculating moment rate;

[0174] 图2中给出了用户在蜂窝网中位置状态的转换及其概率,仅蜂窝网覆盖区域CO中接入蜂窝网的用户,当离开仅蜂窝网覆盖区域CO时,W转移概率护进入第二区域S2,W转移概率进入邻蜂窝网;进入第一区域S1过程中,W概率擊'(即无线局域网中第二区域S2的阻塞率)仍然接入蜂窝网络,W1-您的概率接入无线局域网;第二区域S2中接入蜂窝网的用户离开第二区域S2时,W转移概率pW进入第一区域S1,W转移概率进入仅蜂窝网覆盖区域CO,进入第一区域S1的过程中,W概率巧W仍然接入蜂窝网,W概率1…马W 切换到无线局域网;对于第一区域S1接入蜂窝网的用户离开第一区域S1时,W概率3Γ保持接入蜂窝网,^概率]-巧'^切换到无线局域网;给出仅蜂窝网覆盖区域(3〇、第一区域51、第二区域S2用户驻留时间的矩生成函数分别为: In [0174] FIG. 2 shows the conversion and the user position state probabilities in the cellular network, the user only cellular coverage area of ​​a cellular network access to the CO, when leaving the coverage area of ​​the cellular network only CO, W is the transition probability Support into the second area S2, W o transition probability into the cellular network; process enters the first area S1, W hit probability '(i.e., wireless local area network of the second blocking region S2) is still access the cellular network, W1- your probability WLAN access; the user of the cellular network access to the second area S2 away from the second region S2, W pW transition probability into the first zone S1, W transition probability into the coverage area of ​​a cellular network only CO, into the first area S1 process, W is the probability of coincidence still access the cellular network W, W 1 ... probability Ma W switched to wireless LAN; the first region S1 when the user leaves the cellular network access to a first region S1, W cellular access probability holding 3Γ , the probability ^] - clever '^ switched to wireless LAN; only given cellular coverage area (3〇, a first region 51, second region S2 user dwell time moment generating function are:

Figure CN103269508BD00222

[017引记逗留时间的矩生成函数为Φ置r'(s),起源区域符号变量XI表示用户起源区域, 取值集合为^0,51,52,11(3},目的区域符号变量^2表示用户的目的区域,取值集合为^0, Sl,S2,nc},条件符号变量con可W取值终止条件符号term、一直处于并终止于重叠覆盖区域条件符号dc_term、转移条件符号tran,分别表示由于切换到无线局域网或者邻蜂窝网而终止于目的区域(由目的区域符号变量x2代表的区域),一直在重叠覆盖区域dc内运动并且终止于目的区域,第一次转移到目的区域;因此逗留时间的矩生成函数为Φ,Ι'^.ν)表示用户起源于起源区域(由起源区域符号变量XI代表),按照条件符号变量con所代表的条件而到达目的区域(由目的区域符号变量x2代表)之前所逗留时间的矩生成函数;逗留时间矩生成函数巫1^""0^)表示用户起源于第二区域S2,在第一次运动到仅蜂窝网 [017 primer referred to stay in opposing moment generating function Φ r '(s), origin of the variable region XI symbol indicates the origin of the user area, set the value of ^ 0,51,52,11 (3}, ^ purpose symbolic variable region 2 shows a region of interest of users, the value set is ^ 0, Sl, S2, nc}, the condition may be con symbolic variables W termination condition value symbol term, has been in and terminates in overlapping coverage areas conditional symbols dc_term, the symbol transition condition tran , respectively, since the switching to a neighbor wireless LAN or cellular network to terminate at a target region (target region by the region represented by the symbol variable x2), it has been in the region of overlapping coverage dc moving object region and terminating at first transferred to the region of interest ; therefore stay moment generating function of time is Φ, Ι '^ ν) indicating the user originates from the origin region (represented by the origin region symbolic variable XI), under the conditions the conditions symbolic variable con represents the destination area (by the object area. Representative symbolic variable x2) before the moment generating function of residence time; witch stay moment generating function 1 ^ "" ^ 0) indicates that the user originated in the second region S2, the only movement in the first cellular network 覆盖区域C0之前逗留时间的矩产生函数,为 Moment generating function of residence time before the coverage area of ​​C0, as

[0179] [0179]

Figure CN103269508BD00231

[0180] 类似于上面公式的推导,可W导出几种逗留时间矩生成函数Φ置-fl,巫若_:方,,,, 解:;Γ,ΦΞΓ巧瓜誌2'如下: [0180] similar to the derivation of the above formula can be derived in several W stay Moment Generating Function Φ set -FL, witch if _: ,,,, side Solutions:; Γ, ΦΞΓ Zhi Qiao melon 2 'as follows:

Figure CN103269508BD00232

[0186]记矩产生函数为起源于由起源区域符号变量XI代表的起源区域,而终止于本蜂窝网覆盖范围所逗留时间的矩产生函数;可W导出几种矩产生函数Φϊ·"(句、巧fl(对和巫忘,,村的表达式为: [0186] generation function referred to as the moment origin region originated by the originating XI variable region represented by the symbol, and terminates at the present moment cellular coverage generation function of the time of stay; W may be derived in several moment generating function Φϊ · "(sentence , Qiao fl (to forget ,, and witch village of expression:

Figure CN103269508BD00233

[0190]定义蜂窝网络切换概率为巧表示接入蜂窝网且起源于由起源区域符号变量XI代表的起源区域切换到由目的区域符号变量x2代表的目的区域并接入其他网络(无线局域网和邻蜂窝网络)的概率;则起源于仅蜂窝网覆盖区域CO的用户由当前蜂窝网络切入到邻居蜂窝网络的概率为 [0190] defines the cellular network to switch the access probability of coincidence represented by the cellular origin and the origin of the region representative of symbol variable XI is switched to the region of origin is represented by the symbol variable x2 object region and object region access to other networks (WLAN and o probabilistic cellular network); it originated in the coverage area of ​​the cellular network only CO cut by the user to the current cellular network to the cellular network neighbor probability

[0191] [0191]

Figure CN103269508BD00241

[0192] 起源于第二区域S2的用户,切入到第一区域S1并接入到无线局域网的概率为: [0192] originated from the user of the second region S2, S1 and cut into a first region wireless LAN access probability is:

[0193] [0193]

Figure CN103269508BD00242

[0194] 类似地,可W导出其他几种网络切换概率鼓f-si、巧^wi、:巧巧和"的表达式为: [0194] Similarly, W may be derived in several other network switching probability drum f-si, Qiao ^ wi ,: Qiaoqiao and expression "are:

Figure CN103269508BD00243

[0200] 定义接入无线局域网的用户,由第一区域S1切换到第二区域S2,并仍然接入到无线局域网的概率为: Probability [0200] define an access user wireless LAN is switched from the first area S1 to the second area S2, and still access the wireless local area network is:

[0201] [0201]

Figure CN103269508BD00244

[0202]定义接入无线局域网的用户,由第二区域S2切换到第一区域S1,并仍然接入到无线局域网的概率为: [0202] define an access user wireless LAN is switched from the first area to the second area S2 Sl, and still access the wireless local area network is the probability:

Figure CN103269508BD00245

[0206] 其中蜂窝网的平局服务速率为;无线局域网平均服务速率为怎UJ -W. 1 μ =---〇巧Γη [0206] wherein a draw rate of service for the cellular network; a wireless LAN to how the average service rate UJ -W 1 μ = --- square clever Γη.

[0207] 则切换到达率为 [0207] arrival rate is switched

Figure CN103269508BD00251

[0214]接入域第五步:反复运行第二步到第四步,使得各个切换概率值收敛,并且保存收敛后的无线局域网和蜂窝网络的延时; [0214] Access Domain fifth step: a fourth step to the second step operation is repeated, so that the respective switching probability values ​​converge, and the delay WLAN and cellular network convergence after storage;

[021引接入域第六步:遍历完所有接入域(iK.胃,Λς胃,W'.胃,iV^'.胃)取值集合后,按下面两个条件寻求最优接入域; [Sixth Step 021 access domain primers: After traversing all the access domain set of values, according to the following two conditions for finding the optimal access (iK stomach, Λς stomach, W stomach. 'Stomach, iV ^.'.) area;

[0216] 第一个条件:找到使得蜂窝网络阻塞率r小于阻塞率要求(Bteq),并且蜂窝网络掉线率r小于掉线率要求(护69)的接入域集合;如果集合为空,说明当前业务密度(λ-, λ")条件的接入域不在遍历值集合内,需要调整遍历值的范围; [0216] The first condition: found that the cellular network blocking probability is less than the blocking probability requirements r (BTEQ), and the cellular network is less than the drop rate r dropping rate requirement (guard 69) a set of access domain; if the set is empty, DESCRIPTION current access domain traffic density (λ-, λ ") condition value is not within the set of traversal, traverse to adjust the range of values;

[0217] 第二个条件:在满足第一个条件的接入域集合中,选择使得如下加权延时最小的接入域作为当前业务密度(λ™,λ")的最优接入域;加权延时 [0217] The second condition: the access domain in a set of first condition is satisfied, the minimum delay selected such that the following weighted access domain as the current traffic density (λ ™, λ ") of the optimal access domain; weighted delay

[021 引 [021 Cited

Figure CN103269508BD00252

[0219] 然后按下述的接入策略来引导用户的接入。 [0219] and the following press access policy to guide the user access.

[0220] -、接入网络选择方法 [0220] - Access network selection method

[0221 ]图1给出了网络选择方法,可W分成W下四步: [0221] Figure 1 shows a network selection method can be divided into the four-step W W:

[0222] 网络选择第一步:通过对仅蜂窝网覆盖区域CO和重叠覆盖区域dc的用户到达密度的统计,确定仅蜂窝网覆盖区域CO和重叠覆盖区域dc用户到达速率λ-和λ",通过查找接入域表趴.皿心~,乂"'),^'.舰(乂",乂"'),'^:望(1~,1"'),~;'堇(心",1"')],确定当前的接入域聖,iv:,瞳,iV;L^,iV3;_)值; [0222] Step network selection: only by the user and a cellular coverage area of ​​overlapping coverage area reaches the CO density dc statistics, determined only CO and cellular coverage areas overlapping coverage areas dc user arrival rate and λ- λ ", . ~ heart lying dish, qe by lookup table access domain '.'), ^ 'ship (qe, "qe"'), '^: hope (1, 1' "), ~; 'pansy (heart" , 1 '')], to determine the current access domain St., iv :, pupil, iV; L ^, iV3; _) value;

[0223] 网络选择第二步:对于来自重叠覆盖区域dc的新到达用户和切换用户,首先选择无线局域网作为接入网络;如果当前无线局域网中用户数η"满足胃,则第一区域S1 的新用户和切换用户接入无线局域网;如果当前无线局域网中用户数η"满足,则第二区域S2的新用户和切换用户可W接入无线局域网;如果不满足上述条件,则进行第Ξ 步; [0223] Step Network selection: for dc from overlapping coverage areas and a switch new user reaches the user, as the first selected WLAN access network; if the number of users in the current wireless LAN η "satisfy the stomach, the first area S1 access to new users and the wireless LAN switch user; if the number of users in the current wireless LAN η "is satisfied, the second area S2 and the new user can switch the user access to the wireless LAN W; if the condition is not satisfied, the step is performed first Ξ ;

[0224] 网络选择第Ξ步:对于来自重叠覆盖区域dc的用户,如果不满足第二步中条件,贝U 选择接入蜂窝网络;如果蜂窝网络中的当前用户数ηκ满足《6 < 则新到达用户接入到蜂窝网,否则被阻塞;如果满足η" < W|,,胃,则切换用户接入到蜂窝网络,否则被掉线; [0224] Step Ξ Network Selection: for dc from the overlapping coverage area of ​​the user, if not the second step condition U shellfish selected cellular network; ηκ satisfied if the current number of users in a cellular network "6 <then the new to reach the user access to the cellular network, or is blocked; If the condition η "<W | ,, stomach, the handover user access to the cellular network, otherwise it is dropped;

[0225] 网络选择第四步:对于来自仅蜂窝网覆盖区域CO的用户,如果蜂窝网络中的当前用户数ηκ满足则新到达用户接入到蜂窝网,否则被阻塞;如果蜂窝网络中的当前用户数ηκ满足,则切换用户接入到蜂窝网络,否则被掉线; [0225] The fourth step network selection: only the region from the CO to the user's cellular coverage, the cellular network if the current number of users to meet the new arrival ηκ user access to the cellular network, or is blocked; if the current cellular network ηκ satisfied users, user access is switched to the cellular network, otherwise it is dropped;

[0226] 本仿真中,从理论仿真和实际仿真上验证了本发明方法性能的优异。 [0226] In the present simulation, to confirm the good performance of the method according to the present invention from a theoretical simulation and emulation. 其中,参考算法为普通的无线局域网优先接入算法,即不区分高、低速数据速率用户。 Wherein the reference algorithm common wireless LAN access priority algorithm, i.e., does not distinguish between high and low data rate users. 在图4和图5中,曲线al、a2表示本发明方法的实际仿真值,曲线bl、b2表示本发明方法的理论仿真值。 4 and 5, curves al, a2 represent the actual values ​​of the simulation method of the present invention, curves bl, b2 represents the theoretical value of the simulation method of the present invention. 曲线cl、 c2表示参考算法的实际仿真值,曲线dl、d2表示参考算法的理论仿真值。 Curves cl, c2 represents the actual value of the reference simulation algorithms, curve dl, d2 represents the theoretical value of the reference simulation algorithm.

[0227] 图4给出了当业务文件平均尺寸fd = 500kbits时,延时要求E[r] <req,E[TW] < 严9,阻塞率要求r非teq,掉线率要求DC卽Teq,并且固定仅蜂窝网覆盖区域CO的业务到达率的条件下,本发明提出的方法与参考算法在提高重叠覆盖区域dc吞吐量上的比较。 [0227] FIG. 4 shows the average size of the file when the service fd = 500kbits, delay requirements E [r] <req, E [TW] <9 Yan, non-blocking rate r required TEQ, dropped calls require a DC calipering Teq arrival rate traffic conditions, and only the fixing of CO cellular coverage area, the method proposed in the present invention with reference to the algorithm to improve the throughput comparison in the region of overlapping coverage dc. 由图5可W看出,本发明提出的方法(al,bl)总是优于参考算法(Cl,dl),并且在仅蜂窝网覆盖区域CO业务到达率较低时,本发明方法能够显著提高吞吐量。 W can be seen from Figure 5, the method of (al, bl) proposed by the present invention is always better than the reference algorithm (Cl, dl), and when only the lower region of cellular coverage CO traffic arrival rate, the method of the present invention can be significantly improve throughput. 而随着仅蜂窝网覆盖区域CO到达率的增大,两个方法的吞吐量都单调递减,而发明方法提高的吞吐量会减少,直至为0。 With only the cellular coverage area of ​​increased CO arrival rate, the throughput of the two methods are monotonically decreasing, the method of the invention to improve the throughput will decrease, until it is zero. 原因是,当仅蜂窝网覆盖区域CO业务密度较低时,重叠覆盖区域dc中的低数据速率用户的接入域值^^'"^、比较小,因此大量地接入到蜂窝网络,运样无线局域网主要为高数据速率用户服务,吞吐量较高。而当仅蜂窝网覆盖区域CO业务密度增加时,为了保证延时、阻塞率等要求, 低速率用户接入域值比较大,因此更多地接入到无线局域网,导致无线局域网的吞吐量迅速降低。在仅重叠覆盖区域CO业务到达率比较低时,如λ™ = Seal Is/s,发明的方法可W 比普通的无线局域网优先算法提高约15%的吞吐量,运是极其可观的。 The reason is that, when only the lower region of cellular coverage CO traffic density, overlapping coverage area of ​​low data rate users in the access field value dc ^^ '' ^, is relatively small, so a lot of access to the cellular network, transport comp WLAN user predominantly high data rate services, higher throughput. when only the increase in cellular area coverage CO traffic density, in order to ensure the delay requirements, the blocking rate, a low rate users access field value is relatively large, and therefore more access to the wireless local area network, resulting in rapid decrease of the throughput of the wireless LAN. when only the overlapping coverage areas CO traffic arrival rate is relatively low, such as λ ™ = Seal is / s, the method of the invention may be ordinary wireless LAN than W priority algorithm improves throughput by about 15%, transport is extremely significant.

[0228] 图5给出了当仅蜂窝网覆盖区域CO的到达率为Ae° = 9(calls/s)时,在满足延时、阻塞率及掉线率的限制条件下,吞吐量随着业务文件尺寸变化的示意图。 [0228] Figure 5 shows when only the coverage area of ​​the cellular network arrival rate of CO Ae ° = 9 (calls / s), in the delay has been satisfied, the blocking rate and dropping rate constraints, throughput with schematic file size business changes. 由图可见,重叠覆盖区域dc的吞吐量曲线(曰2,62,〇2,(12)是凹的,因此,重叠覆盖区域如的吞吐量(吞吐量=到达率X文件尺寸)会随着文件尺寸的增大而减小。原因是随着文件尺寸的增大,仅蜂窝网覆盖区域CO的业务密度会增大,因而导致接入到无线局域网中的低速率业务量增大。 Seen from the FIG., A certain overlapping coverage area of ​​the curve of the dc (say, 62, 〇2, (12) is concave, and therefore, overlapping coverage areas, such as the throughput (throughput = X reach the file size) as will be the file size increases. the reason is that with the increase of the file size, only the traffic density cellular coverage area of ​​CO is increased, thus resulting in a low rate of access to a wireless local area network traffic is increased.

[0229] 本发明提出的在蜂窝网和无线局域网融合中无线局域网优先的区分服务速率的接入策略,不仅能够显著提高整个系统的吞吐量,而且易于实施。 [0229] The present invention is proposed fusion DiffServ priority WLAN access policy rate in a cellular network and a wireless local area network, not only can significantly improve the overall system throughput, and easy to implement. 在实际实施中,高服务速率、低服务速率的用户通过信道条件(如信噪比)来区分,而不需要定位。 In actual practice, the high rate service, a low service rate users distinguished by channel conditions (e.g. SNR), without positioning.

Claims (1)

  1. I. 一种蜂窝网和无线局域网融合的接入控制方法,包括接入域的计算和接入网络选择;其特征在于:蜂窝网基站和无线局域网接入点按照下面给出的方法,离线计算出不同业务密度条件下的各种用户的接入域,制定出相应的查询表;然后按照下面的接入网络选择方法来引导用户的接入;分两部分来描述: 一、 接入网络选择方法记仅有蜂窝网覆盖的区域为仅蜂窝网覆盖区域,代表符号为CO,同时被蜂窝网络和无线局域网覆盖的区域为重叠覆盖区域,代表符号为dc,邻居蜂窝网所覆盖的区域为邻居蜂窝网区域,代表符号为nc,重叠覆盖区域又分成高数据速率模式覆盖区域和低数据速率模式覆盖区域,W下分别简称为第一区域和第二区域,代表符号分别为Sl和S2;高或低数据速率模式是由无线局域网中几个较高或较低的物理层数据速率模式组成,覆盖的区域由相应信 I. A cellular network and a wireless local area network access control method for fusion, including calculation and selecting an access domain access network; characterized in that: cellular network base stations and wireless LAN access points according to the methods given below, computed offline various user traffic density in different conditional access domain, develop appropriate look-up table; then, according to the following method for selecting an access network to guide the user access; described in two parts: First, the access network selection the method just referred cellular region covered only cellular network coverage area, representing the symbol of CO.'s, while being area cellular network and a wireless local area network coverage is overlapping coverage areas, representing the symbol of dc, the region covered by the cellular network neighbor to neighbor area cellular network, the representative symbol NC, overlapping coverage areas are divided into high data rate mode coverage area and the coverage area of ​​the low data rate mode, simply referred to as the W first and second regions, respectively representing the symbol Sl and S2; high low data rate mode or a wireless local area network is higher or lower number of physical layer data rate mode composed of the areas covered by the respective channel 干噪比决定;记蜂窝网覆盖范围内,蜂窝网中最大的新用户接入数为W,;,,W,最大切换用户的接入数为胃;无线局域网覆盖范围内,接入无线局域网的第一区域的最大用户接入数为f第二区域的最大用户接入数为胃,即是接入域;接入算法分成W下四步: 接入算法第一步:通过对仅蜂窝网覆盖区域和重叠覆盖区域的用户到达密度的统计, 确定仅蜂窝网覆盖区域和重叠覆盖区域用户到达速率通过查找接入域表[^t。 Interference and noise ratio determined; remember the cellular coverage in a cellular network the maximum number of new users access to W,; ,, W, the maximum number of access users switching stomach; the WLAN coverage area, access to the wireless local area network maximum number of users of the first region is a maximum number of users of the second region f of the stomach, that is, access domain; access algorithm is divided into four steps at W: step access algorithm: only by cellular user network coverage and density of the overlapping coverage areas of arrival statistics, determined only cellular coverage areas overlapping coverage areas and the rate of arrival of the user through the access domain lookup table [^ t. . . 林M,ス"'),¾^林。。,义"'),¾胃(的义"').,碱»(ス"^义"')],确定当前的接入域(iV:,胃,¾,^,挪lW,i^¾;"J 值; 接入算法第二步:对于来自重叠覆盖区域的新到达用户和切换用户,首先选择无线局域网作为接入网络;如果当前无线局域网中用户数rT满足则第一区域的新用户和切换用户接入无线局域网;如果当前无线局域网中用户数nw满足《w<iV^,则第二区域的新用户和切换用户可W接入无线局域网;如果不满足上述条件,则进行第=步; 接入算法第=步:对于来自重叠覆盖区域的用户,如果不满足第二步中条件,则选择接入蜂窝网络;如果蜂窝网络中的当前用户数满足则新到达用户接入到蜂窝网络,否则被阻塞;如果满足,则切换用户接入到蜂窝网络,否则被掉线; 接入算法第四步:对于来自仅蜂窝网覆盖区域的用户,如果蜂窝网络中的当前用户数满足,则新 Lin M, su " '), ¾ ^ .. Lin, Yi' '), ¾ of the stomach (the meaning"'), a base »(su." ^ Sense " ')], to determine the current access domain (iV: , stomach, ¾, ^, Norway lW, i ^ ¾; "J value; Step access algorithm: for a new user to reach the user and the switching from overlapping coverage areas, as the first selected WLAN access network; if the current radio rT LAN users to meet the user of the first switch and the new user access to the wireless LAN region; new user if the current WLAN user nw number satisfies "w <iV ^, and the switching of the second region of the user can access W wireless local area network; if the condition is not satisfied, then for the first step =; = access algorithm steps: the user from overlapping coverage areas, the second step if the condition is not satisfied, then the selected cellular network; if the cellular network the current number of users to meet the newly arrived user access to a cellular network, or is blocked; if so, switching the user access to the cellular network, otherwise it is dropped; the fourth step access algorithm: for cellular coverage area only from the user, if the current number of users to meet the cellular network, the new 达用户接入到蜂窝网络,否则被阻塞;如果蜂窝网络中的当前用户数ne满足/f ,側切换用户接入到蜂窝网络,否则被掉线; 二、 接入域的计算;接入域的计算分成六步进行,在网络系统实施前,离线算出接入域与业务密度a™, AW)的对应表; 接入域第一步:对于每组业务密度,遍历接入域吹胃货0Uw):,iV;,胃媒^货0,义w),^胃从的非负整数取值; 接入域第二步:对于每一个接入域遍历值(,ACax,),计算无线局域网中的延时和阻塞率;过程如下: 设无线局域网的状态为(<,皆),分别表示第一区域和第二区域中接入无线局域网的用户数,则状态转移的无穷小矩阵为: Of user access to a cellular network, or is blocked; the cellular network if the current number of users satisfying ne / f, side switching user access to the cellular network, otherwise it is dropped; two, computing access domain; access domain calculation performed into six steps, before the implementation of the network system, calculates the off-line access domain and traffic density a ™, AW) correspondence table; access domain step: for each set of traffic density, traversing the access domain blowing stomach goods 0Uw) :, iV ;, goods 0 ^ gastric medium, Yi W), ^ non-negative integer values ​​from stomach; access domain Step: for each traverse the access domain values ​​(, ACax,), calculation of the radio LAN delay and blocking rate; as follows: set a state of the wireless LAN (<, both), respectively, the number of users in a first region and a second region wireless LAN access, the infinitesimal state transition matrix is:
    Figure CN103269508BC00031
    其中的=个中间变量矩阵第一中间变量矩阵B、第二中间变量矩阵D和第=中间变量矩阵E分别表示如下: Wherein = a first intermediate variable matrix intermediate variable matrix B, and a second intermediate variable matrix D = second intermediate variable matrix E are as follows:
    Figure CN103269508BC00032
    其中反指示函数 Where anti indicator function
    Figure CN103269508BC00033
    第一中间变量第二中间变量M ',皆'和解分别为第一区域和第二区域中的用户到达率, A first intermediate variable of the second intermediate variable M ', are' reconciliation are user arrival rate of the first region and the second region,
    Figure CN103269508BC00034
    ,Sl和s2分别为第一区域和第二区域的面积;C哺省-2分别为第一区域和第二区域中接入蜂窝网络的用户切换到无线局域网的速率,端。 , Sl and s2 are the area of ​​the first region and the second region; -2 C Province feeding user respectively in the first and second regions of the cellular network to switch to the rate wireless LAN terminal. 和碱,是无线局域网中用户从第一区域移动到第二区域,和从第二区域移动到第一区域的转移速率,将在第四步中计算; 妊化/)和佔化_/)分别为第一区域和第二区域用户在无线局域网中的服务速率; 记状态("r,"D 的稳态概率为K=Oo,町,312,...,刪),3In=〇w(n,0),3iW(n,l),. . . XCn, M)),则稳态概率的表达式为=(分.台)I.分b,其中 And a base, a wireless LAN user moves from the first region to the second region, and the calculated area is moved to a second transfer rate from the first region in the fourth step; of pregnancy /) and duty of _ /) respectively the first and second regions user service rate in a wireless LAN; referred status ( "r," steady-state probability D is K = Oo, cHO, 312, ..., delete), 3In = 〇w (n, 0), the expression 3iW (n, l) ,... XCn, M)), is the steady-state probability = (min. units) the I. points b, where
    Figure CN103269508BC00041
    则第一区域和第二区域用户在无线局域网中的阻塞率分别为: The first and second regions of the blocking rate of users in a wireless LAN are:
    Figure CN103269508BC00042
    则无线局域网的延时均值为: The wireless local area network delays mean:
    Figure CN103269508BC00043
    接入域第S步:对于每一个遍历值(满;胃,辦,胃,明;^,iv^),计算蜂窝网络中的阻塞率、掉线率和延时,过程如下: 记蜂窝网络的状态为的。 The first access domain Step S: For each traversal value (full; stomach, do, stomach, Ming; ^, iv ^), the blocking rate calculation in a cellular network, dropped calls and the delay, as follows: the cellular network referred to the state of. ,旬,刮,分别表示起源于仅蜂窝网覆盖区域,第一区域,第二区域,并一直接入到蜂窝网的用户数;则各个状态之间的转移速率表示如下: , Ten days, scraping, respectively originated only cellular coverage area, a first region, a second region, and the number of users has access to the cellular network; transfer rate between the respective states as follows:
    Figure CN103269508BC00044
    其中,,雌6分别为邻居蜂窝网小区到本小区的切换速率和无线局域网切换到仅蜂窝网覆盖区域的速率,心咕,-+-<+句为逗留时间矩生成函数,临时符号变量X可代表符号CO、Sl、S2,将在第四步计算; 蜂窝网用户服务速率为, 6, respectively ,, wherein the female neighbor cell to the cellular network the switching rate of the cell and switch to the wireless LAN only the rate of cellular network coverage area, the heart of cushions, - + - <+ period of stay moment generating function, a temporary variable symbols X symbol may represent CO, Sl, S2, calculated in the fourth step; cellular subscriber service rate,
    Figure CN103269508BC00051
    ' 为蜂窝网总带宽,fd是业务的平均数据尺寸; 记接入蜂窝网的用户数为妒=<。 'Is the total bandwidth of the cellular network, fd is the average size of the data traffic; the number of users accessing the cellular network is referred jealous = <. +<+<,则蜂窝网中用户数ne的分布概率为 + <+ <, The probability distribution of the number of subscribers in a cellular network is ne
    Figure CN103269508BC00052
    则蜂窝网中的阻塞率和掉线率分别为: The cellular network blocking rate and dropping rates were:
    Figure CN103269508BC00053
    蜂窝网中的平均延时为: The average delay cellular network as follows:
    Figure CN103269508BC00054
    接入域第四步:逗留时间矩函数和切换速率的计算; 用户在蜂窝网中位置状态的转换及其概率描述如下:仅蜂窝网覆盖区域中接入蜂窝网的用户,当离开仅蜂窝网覆盖区域时,W转移概率护^进入第二区域,W转移概率护1-PK ^进入邻蜂窝网;进入第一区域过程中,W概率瑪*'(即无线局域网中第二区域的阻塞率)仍然接入蜂窝网络,化1-媒'的概率接入无线局域网;第二区域中接入蜂窝网的用户离开第二区域时,W转移概率pw进入第一区域,W转移概率进入仅蜂窝网覆盖区域,进入第一区域的过程中,W概率巧"仍然接入蜂窝网,W概率1-邱切换到无线局域网;对于第一区域接入蜂窝网的用户离开第一区域时,W概率巧W保持接入蜂窝网,W概率1-游切换到无线局域网;给出仅蜂窝网覆盖区域、第一区域、第二区域用户驻留时间的矩生成函数分别为 Access Domain fourth step: calculation of the switching function and the moment stay rate; and converting the user position state probability cellular network is described as follows: the user only cellular coverage area of ​​access to a cellular network, the cellular network when leaving only coverage area, W ^ transition probability into the second guard region, W transition probability into the guard 1-PK ^ o cellular network; into the first area of ​​the process, W is the probability of Ma * '(i.e., the blocking rate in the second region wireless local area network ) still access the cellular network, probabilistic 1- media 'access to the wireless local area network; a user of a cellular network access away from the second region of the second region, W pw transition probability into the first zone, W transition probability into the cell only process network coverage area into the first area, W is the probability clever "still access the cellular network, W is switched to the probability 1- Qiu WLAN; for the first user access to a cellular network region away from the first region, W probability maintaining access to the cellular network Qiao W, W is switched to the probability 1- swim WLAN; only given cellular coverage area, a first region, a second region moment generating function user residence time were
    Figure CN103269508BC00055
    Figure CN103269508BC00061
    其中,各个参数的含义说明:? Among them, the meaning of each parameter Description:? r表示用户在CO区域的驻留时间,? r represents CO user dwell time area,? f表示用户在SI区域的驻留时间,If2表示用户在S2区域的驻留时间,中间变量IT表示IT均值的倒数,中间变量rfi表示护咱值的倒数,中间变量If2表示梦2均值的倒数,a表示高移速和低移速用户的比例调节因子; 记逗留时间的矩生成函数为巫二产(句,起源区域符号变量Xl表示用户起源区域,取值集合为k〇,Sl,S2,nc},目的区域符号变量x2表不用户的目的区域,取值集合为k〇,Sl,S2, nc},条件符号变量con可取值终止条件符号term、一直处于并终止于重叠覆盖区域条件符号dc_term或转移条件符号化an,分别表示由于切换到无线局域网或者邻蜂窝网而终止于目的区域,一直在重叠覆盖区域dc内运动并且终止于目的区域或第一次转移到目的区域; 因此逗留时间的矩生成函数为巫式;'> 3(句表示用户起源于起源区域,按照条件符号变量con 所代表的条件而到达目的区域之 f represents the user dwell time SI region, the user indicates If2 dwell time area S2, the intermediate variable IT IT reciprocal of the mean, represented by the intermediate variable rfi protection we reciprocal value of the intermediate variable If2 2 represents the reciprocal of the mean dream , a represents the ratio of the high shift speed and low user moving speed adjustment factor; referred to stay moment generating function witch two production (sentences, Xl represents the origin of the variable region of a user origin symbol area, set of values ​​for the k〇, Sl, S2 , nc}, x2 symbol variable region object table is not the purpose of the user area, set of values ​​for the k〇, Sl, S2, nc}, the condition value may be variable symbols con termination condition symbol term, has been in and terminates in overlapping coverage areas or a transition condition dc_term symbol symbolic an, respectively, since the switching to the wireless LAN or cellular network neighborhood and ends at the destination area, has been the region of overlapping coverage the motion dc and terminating at first transferred to a target region or region of interest; thus stay as witch moment generating function formula; '> 3 (period indicates that the user originates the origin region, the conditions under the conditions represented by the symbol variable con and the destination area 前所逗留时间的矩生成函数;逗留时间矩生成函数巫f"云W Cs)表示用户起源于第二区域,在第一次运动到仅蜂窝网覆盖区域之前逗留时间的矩产生函数,为 Stay before the moment generating function; witch stay Moment Generating Function f "cloud W Cs) indicating the user originates from a second region, the first moment of motion to stay just before the coverage area of ​​the cellular network time generation function, is
    Figure CN103269508BC00062
    类似于上面公式的推导,导出几种逗留时间矩生成函数斬5式。 Similar to the derivation of the above formula, deriving several cut stay Moment Generating Function of formula 5. ,®志:忘,,巧二:。 , ® Chi: forget ,, Qiao II:. , 和如下: , And are as follows:
    Figure CN103269508BC00063
    记矩产生函数&1,(刊为起源于由起源区域符号变量Xl代表的起源区域,而终止于本蜂窝网覆盖范围所逗留时间的矩产生函数;导出几种矩产生函数巫訖如)、斬L树和嫂L的的表达式为: Note the moment generating function & 1, (published as originating from the origin region from the origin region symbolic variables Xl represented terminate moment of this cellular coverage of the stay time generation function; export several moment generating function witch finished such), chopped L expression trees and Mrs. L is:
    Figure CN103269508BC00071
    定义蜂窝网络切换概率为,表示接入蜂窝网且起源于由起源区域符号变量Xl代表的起源区域切换到由目的区域符号变量x2代表的目的区域并接入其他网络无线局域网和邻蜂窝网络的概率;则起源于仅蜂窝网覆盖区域的用户由当前蜂窝网络切入到邻居蜂窝网络的概率为 It is defined as a cellular network switching probability, indicating that the access to the cellular network and is originated by the originating region representative of symbol Xl variable region of origin to a destination switching region by the object variable region represented by the symbol x2 and the access probability other networks WLAN and cellular networks o ; originated in user only cellular coverage area cut by the current cellular network to the cellular network is the probability of the neighbor
    Figure CN103269508BC00072
    起源于第二区域的用户,切入到第一区域并接入到无线局域网的概率为: It originated from the user of the second region, the first region and to cut an access probability for the wireless local area network:
    Figure CN103269508BC00073
    类似地导出其他几种网络切换概率巧'0^1、i巧Ml、/广U、巧和哉-S'2的表达式为: Similarly, several other network switching probability derived clever '0 ^ 1, i clever Ml, / wide U, Kazuya -S'2 clever expression is:
    Figure CN103269508BC00074
    定义接入无线局域网的用户,由第一区域切换到第二区域,并仍然接入到无线局域网的概率为: Define an access probability that the user wireless LAN is switched from the first region to the second region, and still access the wireless local area network is:
    Figure CN103269508BC00075
    定义接入无线局域网的用户,由第二区域切换到第一区域,并仍然接入到无线局域网的概率为: Define an access probability that the user wireless LAN is switched from the second region to the first region, and still access the wireless local area network is:
    Figure CN103269508BC00081
    无线局域网中的用户,切换到蜂窝的概率为 User wireless LAN, the probability of switching to cellular
    Figure CN103269508BC00082
    其中蜂窝网的平局服务速率为 Where the draw for cellular network service rate
    Figure CN103269508BC00083
    ,无线局域网平均服务速率为 Wireless LAN average service rate
    Figure CN103269508BC00084
    '则切换到达率为: 'Arrival rate is switched:
    Figure CN103269508BC00085
    接入域第五步:反复运行第二步到第四步,使得各个切换概率值收敛,并且保存收敛后的无线局域网和蜂窝网络的延时; 接入域第六步:遍历完所有接入域(嗎,^,麟,胃,取值集合后,按下面两个条件寻求最优接入域; 第一个条件:找到使得蜂窝网络阻塞率r小于阻塞率要求(Bteq),并且蜂窝网络掉线率r小于掉线率要求(护69)的接入域集合;如果集合为空,说明当前业务密度(A-,Aw)条件的接入域不在遍历值集合内,需要调整遍历值的范围; 第二个条件:在满足第一个条件的接入域集合中,选择使得如下加权延时最小的接入域作为当前业务密度a™,AW)的最优接入域;加权延时为: Access Domain fifth step: a fourth step to the second step operation is repeated, so that the respective switching probability values ​​converge, and the delay of the wireless LAN and the cellular network after storage of convergence; access domain sixth step: After traversing all access domain (morpholin ^, Lin, the stomach, the set of values, according to the following two conditions for finding the optimal access domain; first condition: found that the cellular network blocking probability is less than the blocking probability requirements r (BTEQ), and the cellular network drop rate r is less than dropping rate requirement (guard 69) a set of access domain; if the set is empty, indicating that the current access domain traffic density (A-, Aw) value of the condition is not within the set of traversal, traverse to adjust the value range; second condition: the access domain in a set of first condition is satisfied, the minimum delay selected such that the following weighted access domain as the current traffic density a ™, AW) optimal access domain; weighted delay for:
    Figure CN103269508BC00086
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CN101827396A (en) * 2010-04-29 2010-09-08 北京邮电大学 Multi-net cooperative transmission resource distribution system in heterogeneous wireless environment and method

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