Title :
Congestion control policies for IP-based CDMA radio access networks
Author :
Kasera, Sneha K. ; Ramjee, Ramachandran ; Thuel, Sandra ; Wang, Xin
Author_Institution :
Lucent Technol. Bell Labs, Holmdel, NJ, USA
Abstract :
As CDMA-based cellular networks mature, the current point-to-point links used in connecting base stations to network controllers will evolve to an IP-based radio access network (RAN) for reasons of lower cost due to statistical multiplexing gains, better scalability and reliability, and the projected growth in data applications. In this paper, we study the impact of congestion in a best-effort IP RAN on CDMA cellular voice networks. We propose and evaluate three congestion control mechanisms, admission control, diversity control, and router control, to maximize network capacity while maintaining good voice quality. We first propose two new enhancements to CDMA call admission control that consider a unified view of both IP RAN and air interface resources. Next, we introduce a novel technique called diversity control that exploits the soft-handoff feature of CDMA networks and drops selected frames belonging to multiple soft-handoff legs to gracefully degrade voice quality during congestion. Finally, we study the impact of router control where an active queue management technique is used to reduce delay and minimize correlated losses. Using simulations of a large mobile network, we show that the three different control mechanisms can help gracefully manage 10-40% congestion overload in the IP RAN.
Keywords :
IP networks; Internet telephony; cellular radio; code division multiple access; computer network management; multiplexing; queueing theory; radio access networks; radio links; telecommunication congestion control; telecommunication network routing; CDMA call admission control; CDMA network soft-handoff feature; IP-based CDMA radio access network; active queue management technique; admission control; air interface resource; base station connection; cellular voice network; congestion control policy; congestion overload; correlated loss minimization; data application; diversity control; frame selection; mobile network; network capacity; network controller; network reliability; point-to-point link; router control; statistical multiplexing gain; voice quality; Admission control; Base stations; Cellular networks; Costs; Joining processes; Land mobile radio cellular systems; Multiaccess communication; Radio access networks; Radio control; Scalability;
Conference_Titel :
INFOCOM 2003. Twenty-Second Annual Joint Conference of the IEEE Computer and Communications. IEEE Societies
Print_ISBN :
0-7803-7752-4
DOI :
10.1109/INFCOM.2003.1208721