A Call Admission Control Strategy for TD-SCDMA

Trunking Communication System Tang Hong1,2, Wang Wei 1,2, Xie Jing1,2, Chen Qian bin1,2

Chongqing Key Lab of Mobile Communications Technology, Chongqing 400065 1 School of Communication and Information Engineering, Chongqing University of Posts and Communications Chongqing

400065 2

Abstract—With the growth of bandwidth adaptive applications in wireless and mobile networks with different QoS requirements, there is an urgent need for an adaptive bandwidth management scheme which makes use of the flexible bandwidth requirements of these new traffic classes. In this paper, a Call Admission Control(CAC) strategy is proposed based on full consideration of the adaptivity of multimedia services and the priority of trunking user, in which nitial Access Rate Discount and Deceleration is adopted. The algorithm improves the flexibility of system resource allocation by using different initial access rate for different services according to their characteristics; Meanwhile, utilizing deceleration strategy to further ensure the Quality of Service(QoS) of high-priority users and services. Compared with existing schemes, the proposed algorithm improves the overall performance of system.

Keywords-TD-SCDMA trunking communication system call admission control, adaptive, initial access rate discount, deceleration

I.

CDMA TDDTD-SCDMA PTT

3G 3G[1] TD-SCDMA

TD-SCDMA

TD-SCDMAE-mail

[2]

[3][4]

[5] [4]

TD-SCDMA

II.

A. TD-SCDMA

B. 3GPP [6]

QoS

2852978-1-61284-459-6/11/$26.00 ©2011 IEEE

1 [7]

1 Kbps

iniR guaR minR

maxR

1

2

3

iniRguaR

minR maxR

C.

i serveB − miniB −

i serveB − miniB −

deg min minmin( , - )rad i serve iB B B B− −=

minB

min-i serve iB B− −

deg min minmin( , - )rad i serve iB B B B− −=

deg minradB B=

deg min-rad i serve iB B B− −=

D.

i serveB

− miniB

−

1 2

1

P

maxfree cB B −≥

P

deg maxfree i rad cB B B− −+ ≥

N

Y

Y

N

Y

N

Y

Y

deg deprive deg maxfree i rad i s rad cB B B B B− − − −+ + + ≥ Y

N

Y

N

N

Y

deg deprive maxfree i rad i cB B B B− − −+ + ≥ Y

N

N

N

2853

2

freeB

degi radB − depriveiB −

degs radB −

III.

A.

1P 2P 1P 2P

1P 1PN 2P 2PN

1PN 2PN 1PN 2PN =1 1

1P

1PN 1P VN

1P IN 1P VN 1P IN =4:12P

λ

totalB =40

2

1 BU 100s

2-4 BU 180s

B.

CBP

12

34

5

4

P

minfree iB B −≥

P

deg minfree i rad iB B B− −+ ≥

N

Y

Y

N

Y

N

Y

N

Y

NP

N

Y

deg deprive minfree i rad i iB B B B− − −+ + ≥ Y

N

2854

42 1

1P

2P

1P 2P

2P

1P 1P 2P

6

IV. CDMA

TD-SCDMA

863 2009AA011302—TD-

SCDMAZ2007-1-63002

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[3] S. Singh, ”Quality of service guarantees in Mobile Computing”, Computer Communication,no. 19, 1996, pp. 359-371.

[4] S. Sen, J. Jawanda, K. Basu and S. Das, ”Quality of Service Degradation Strategies in Multimedia Wireless Network,” IEEE VTC,vol.3, May 1998.

[5] T. Kwon, I. Park, Y. Choi and S. Das, ”Bandwidth Adaptation Algorithms with Multi-Objective for Adaptive Multimedia Services inWireless/Mobile Networks”, ACM WOWMOM, 1999.

[6] 3GPP TR 25.942 V8.0.0 3rd Generation Partnership Project; Technical Specification Group Radio Access Networks; RF System Scenarios(Release 8), Dec.2008:26

[7] Jordi Perez-Romero Oriol Sallent Ramon Agusti Miguel Angel Diaz-Guerra. Radio Resource Management Strategies in UMTS[M], first published, xi’an xi'an jiao tong university press, 2008.5:261-306.

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