基于模糊逻辑的多终端协同的垂直切换决策算法

doi:10.3969/j.issn.1000-436x.2014.09.007

Abstract

Abstract:

In order to solve the problem of vertical handoff decision for cooperation of multi-terminal,a fuzzy logic and AHP (analytic hierarchy process) based vertical handoff decision algorithm was proposed,which included the decision of the moment of triggering handoff and the construction of virtual terminal.Firstly,fuzzy logic was applied to decide the moment of triggering handoff.Secondly,a method combining AHP and SAW (simple additive weight) was used to choose the best composition manner of virtual terminal.Simulation results show that the proposed algorithm reduces the number of handoffs and the ratio of unnecessary handoffs.Additionally,it reflects application requirements and user preferences clearly.

Key words: heterogeneous networks, cooperation of multi-terminal, virtual terminal, vertical handoff decision, fuzzy logic

Gong-ye REN,Ji-hong ZHAO,Hua QU. Vertical handoff decision algorithm for cooperation of multi-terminal based on fuzzy logic terminal[J]. Journal on Communications, 2014, 35(9): 67-78.

Figures/Tables 21

序号	距离 $\vec{\| L O \|}$	角度θ	速度v	切换值
1	短	小	低	高
2	短	小	中	高
3	短	小	高	高
4	短	中	低	高
5	短	中	中	高
6	短	中	高	稍高
7	短	大	低	高
…	…	…	…	…
13	中	中	低	稍高
14	中	中	中	中
15	中	中	高	中
16	中	大	低	中
17	中	大	中	稍低
…	…	…	…	…
27	长	大	高	低

References 14

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网络	带宽/(Mbit·s^?1)	费用/(元·Mbit^?1)		功率/W
网络	带宽/(Mbit·s^?1)	费用/(元·Mbit^?1)	终端1	终端2	终端3
WLAN1	B_W1	C_W1	P_1-W1	—	—
WALN2	B_W2	C_W2	—	P_2-W2	—
UMTS	B_U	C_U	—	—	P_3-U
IEEE 802.15	—	—	P₁	P₂	P₃

信息元素类型	内容描述
第1类信息元素	描述一定区域内各类异构网络的总体特性，如可用的网络和运营商、漫游协议、费用、安全性等
第2类信息元素	描述各基站和各接入点的特性，如各基站和接入点的位置、QoS 参数（带宽、时延、抖动等）、支持的业务等
第3类信息元素	描述服务提供商的特定信息

信息类型	获取实体	信息来源
用户位置	GPS、位置传感器	本地终端
接入点位置	网络信息收集器	MIIS第2类信息元素
可用带宽	网络信息收集器	MIIS第2类信息元素
费用	网络信息收集器	MIIS第1类信息元素
功率	终端管理器	本地终端
用户偏好	用户偏好管理器	本地终端

状态类型	内容描述
网络状态	网络的QoS参数发生较大改变
终端状态	正在使用的终端不可用
	新的终端加入
	正在使用的终端电量较低
应用状态	应用类型改变
用户状态	用户偏好改变

网络	带宽/(Mbit·s^?1)	费用/(元·Mbit^?1)		功率/W
网络	带宽/(Mbit·s^?1)	费用/(元·Mbit^?1)	终端1	终端2	终端3
WLAN1	0.85	0.010 0	4.00	3.50	—
WLAN2	0.75	0	4.00	3.50	—
WLAN3	0.70	0.002 5	4.00	3.50	—
WLAN4	0.65	0.007 5	4.00	3.50	—
WLAN5	0.68	0.009 0	4.00	3.50	—
UMTS	0.32	0.040 0	1.00	—	0.75
IEEE 802.15	—	—	10^?3	10^?3	1.25×10^?3

Vertical handoff decision algorithm for cooperation of multi-terminal based on fuzzy logic terminal

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Figures/Tables 21

References 14

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网络	A类用户	B类用户
WLAN1	A	C
WLAN2	A	C
WLAN3	A	D
WLAN4	A	D
WLAN5	A	D
UMTS	B	E

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