异构网络中基于负载传递的联合接纳控制算法

doi:10.11959/j.issn.1000-436x.2018075

Abstract

Abstract:

A load-transfer-based joint admission control (LJAC) algorithm in heterogeneous networks was proposed.The access requirements of users were admitted based on load balancing,the dynamic load transfer of traffics in the overlapping coverage areas of heterogeneous networks were introduced,and the influence of such factors as the layout of heterogeneous networks and the vertical handoff was considered in the algorithm.The integrated system of heterogeneous networks was modeled as a multidimensional Markov chain,the steady-state probabilities were obtained and the quality of service (QoS) performance metrics were derived.Based on the Poisson point process theory,the upper bound of capacity of the heterogeneous networks satisfying QoS limitations was obtained.The admission control parameters of the integrated system of heterogeneous networks were optimized in order to maximize the resource utilization rate as well as guaranteeing the QoS of users.The simulation results demonstrate lower traffic blocking probability,lower failure probability of vertical handoff requirements,and larger system capacity gain can be achieved by using the proposed LJAC algorithm.

Key words: heterogeneous network, load transfer, admission control, quality of service, Poisson point process

CLC Number:

TN929.5

Weiwei XIA,Zhaoming DING,Lianfeng SHEN. Joint admission control algorithm based on load transfer in heterogeneous networks[J]. Journal on Communications, 2018, 39(5): 34-47.

Figures/Tables 11

符号	含义
RAN-i	无线接入网络i（i=1,…,I）
R(A_m)	子区域A_m中的接入请求能够接入的RAN集合
U	集合R(A_m)中元素的个数
A(R_i)	RAN-i覆盖范围内子区域的集合
N(A_m)	子区域A_m相邻区域的集合
$N_{i}^{\max}$	$N_{i}^{\max}$ 中能够接纳的最大接入请求数目
N^max	异构网络融合系统容量上界
$N_{r}^{\max}$	参考系统容量
$N_{i j}^{\max}$	子区域A_j中接入RAN-i的业务请求的最大数目
T_m	用户在每个子区域A_m的停留时间
p^j→m	用户从子区域A_j进入A_m的概率
σ_m	用户在子区域A_m中的分布密度
η_m	用户在子区域A_m中的离开率
E[H]	接入请求的业务长度均值
μ_i	RAN-i中业务的服务率
L_i	RAN-i的当前负载状况
$L_{i}^{t h}$	RAN-i的负载门限
δ_i	RAN-i中已接纳接入请求的传递率
G_i	RAN-i中始发接入请求和被传递的接入请求的接纳阈值
N_i	RAN-i中垂直切换请求的接纳阈值
n _ji	区域A_j中接入到RAN-i的业务请求数目
n_i(s)	系统状态为s时，RAN-i接纳的业务请求数目
λ_om	子区域A_m中始发接入请求的到达率
λ_oj,i	子区域A_j的始发接入请求进入RAN-i的到达率
$λ_{h (j \to m), k}^{}$	用户从子区域A_j移动到A_m时，垂直切换至RAN-k的到达率
γ_i	RAN-i接纳的用户从子区域A_j移动到A_m时，由于垂直切换失败导致的业务离开率
$λ_{t j, (i \to k)}$	子区域A_j中由RAN-i传递至RAN-k的接入请求到达率
λ_hj,i	进入A_j区域并垂直切换到RAN-i的业务请求到达率
λ_oj	始发接入请求进入区域A_j的平均到达率
λ_o	异构网络融合系统中始发接入请求的到达率
λ₀	单位面积的区域中业务的到达率
B_oi	始发请求接入RAN-i时的阻塞率
B_oa,j	始发接入请求进入区域A_j时的阻塞率
B_o	异构网络融合系统中始发接入请求的平均阻塞率
D_h	向RAN-i发出的垂直切换请求的阻塞率
$D_{h a, j}^{}$	向子区域A_j发出的垂直切换请求的阻塞率
D_h	异构网络融合系统中垂直切换平均失败率
${\bar{S}}_{i}$	RAN-i中用户的平均吞吐量
${\bar{S}}_{i j}$	接纳至RAN-i的子区域A_j中用户的平均吞吐量
${\bar{S}}_{i j}$	异构网络融合系统中用户的平均吞吐量
P_bij	子区域A_j中接入到RAN-i的业务请求的网络饱和率
${\hat{P}}_{b, i j} 和 {\hat{S}}_{i j}$	子区域A_j中接入到RAN-i的业务请求的网络饱和率和平均吞吐量上界
${\hat{B}}_{o} 、 {\hat{D}}_{h} 和 \hat{S}$	异构网络融合系统中始发接入请求的平均阻塞率上界、垂直切换失败率上界、吞吐量下界
$H_{N_{}^{\max}}^{}$	系统容 $N_{i}^{\max}$ 量增益

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类型	服从的分布	重要参数
子区域A_m中始发接入请求到达过程	泊松分布	到达率λ_om
接入请求的业务长度	指数分布	均值E[H]
RAN-i中业务的服务时间	指数分布	服务率μ_i^[19]

参数	取值
UMTS的最大发射功率/W	20
UMTS的载波带宽/MHz	5
WLAN带宽/MHz	22
WLAN的发射功率/mW	100
UMTS的传播模型中路径损耗指数	3.52
UMTS的传播模型中阴影衰落的方差/dB	8
WLAN传播模型中的衰减/(dB?m^–1)	0.3
WLAN的传播模型中阴影衰落的方差/dB	3
业务请求的平均呼叫长度E[H]/KB	64
UMTS的业务服务时间(μ₁) ^–1/min	3
WLAN1和WLAN2的业务服务时间(μ₂)^–1,(μ₃)^–1/min	1
单位面积的区域中业务的到达率λ₀/(min^–1·m^–2)	0.000 1

Joint admission control algorithm based on load transfer in heterogeneous networks

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