In LTE base-stations, RoHC is a processing-intensive algorithm that may limit the system from serving a large number of users when it is used to compress the VoIP packets of mobile traffic. In this paper, a hardware-software and a full-hardware solution are proposed to accelerate the RoHC compression algorithm in LTE base-stations and enhance the system throughput and capacity. Results for both solutions are discussed and compared with respect to design metrics like throughput, capacity, power consumption, and hardware resources. This comparison is instrumental in taking architectural level trade-off decisions in-order to meet the present day requirements and also be ready to support a future evolution. In terms of throughput, a gain of 20% (6250 packets/sec) is achieved in the HW-SW implementation by accelerating the Cyclic Redundancy Check (CRC) and the Least Significant Bit (LSB) encoding in hardware. The full-HW implementation leads to a throughput of 45 times (244000 packets/sec) compared to the SW-Only implementation. The full-HW solution consumes more Adaptive Look-Up Tables (7477 ALUTs) compared to the HW-SW solution (2614 ALUTs) when synthesized on Altera's Arria II GX FPGA.

Recent research has shown that fluid-flow queueing models accurately determine the burst level component of the ATM multiplexer process, and fluid models therefore constitute an efficient tool for the investigation of admission control in ATM networks. This article first gives a review of Markov-driven fluid queues with special attention given to the heterogeneous on/off model. Then an approximation procedure in which the original heterogeneous arrival process is replaced by a homogeneous birth-death arrival process is presented. The substitution is based on matching statistical parameters. Finally, the approach is evaluated by numerical examples.>

Presents a power control algorithm based on carrier to interference ratio and simulation results showing a substantial capacity gain in a cellular environment. The power control algorithm is fully decentralized and uses only knowledge of transmitted power and received carrier to interference ratio in the current link.>