|
axrforTzntx of tzll zKTission tontrol with aowxr tontrol in TultiTxKiz txllulzr SystxTs
Young-Long ZAxn a, Jyu-Wxi Wang b, JyA-Liang ZAxn c and JyA-Aorng Wxn d
aDxpartPxnt of xlxZtriZal xnginxxring, ZAixnTuo TxZAnology UnivxrPity, Taiwan. R.O.Z.
bDxpartPxnt of ZoPputxr and ZoPPuniZation xnginxxring, APia UnivxrPity, Taiwan R.O.Z.
cDxpartPxnt of xlxZtriZal xnginxxring, National ZAung ZAxng UnivxrPity 168, UnivxrPity Rd., Ping-APiung, ZAia-Yi, Taiwan, R.O.Z.
dDxpartPxnt of xlxZtriZal xnginxxring, TungAai UnivxrPity, Taiwan. R.O.Z.
|
Abstract:
Conventional call admission control (CAC) methods generally accept (or reject) new call arrivals on the basis of measured information such as the signal-to-interference ratio (SIR) or the total received power in the individual cells. However, this paper proposes a novel approach which combines the CAC and power control mechanisms and operates in a centralized control manner. The essence of the proposed centralized call admission control (CCAC) scheme is to combine the two mechanisms and to treat the call admission decision as an eigen-decomposition problem. In the proposed approach, a new call is accepted only if the quality-of-service (QoS) requirements of all the active links in the network can still be maintained. In order to reduce the computational complexity of the eigen-decomposition problem, the paper proposes an additional scheme which uses a norm operation rather than direct computation. The simulation results indicate that the proposed scheme, even with the norm approximation, outperforms conventional call admission methods both in terms of its blocking rate and its outage rate.
|
|
Keywords: call admission control; signal-to-interference ratio (SIR); eigen-decomposition problem, norm operation.
|
Download PDF
|
|
*Corresponding author; e-mail: wen@ee.ccu.edu.tw
|
©
2007
CSME , ISSN 0257-9731
|