ANALISA DELAY PAKET PADA JARINGAN GSM/EDGE (PACKET DELAY ANALYSIS ON GSM/EDGE NETWORK)

ABSTRAKSI: Enhanced Data rates for GSM Evolution (EDGE) merupakan salah satu standar untuk komunikasi data wireless yang diimplementasikan pada jaringan selular GSM dan merupakan tahapan lanjutan dalam evolusi menuju mobile multimedia communication. EDGE merupakan evolusi terakhir teknologi sistem seluler GSM menuju UMTS/UTRAN (UMTS Terestrial Radio Access Network) dengan kecepatan paket data 473,6 kbps. Tugas akhir ini akan menghadirkan analisa performansi kanal sharing untuk mendukung transmisi suara dan data secara circuit switched dan packet switched dalam jaringan GSM/EDGE. Penelitian akan dilakukan pada tiga jenis kanal sharing pada arah uplink dan downlink : Partial Sharing Schemes, Complete Partitioning serta Complete Sharing Schemes. Perbandingan kanal sharing menunjukkan perbedaan performansi jaringan yang dilihat dari delay paket rata – rata, probabilitas blocking paket dan suara, serta pengaruh voice call load pada jaringan. Hasil penelitian memberikan rekomendasi batas maximum offered traffic yang bisa dilayani 1,2673 Erlang untuk jaringan dengan N = 8 dan beban suara 80%. Namun dengan nilai probabilitas blocking suara yang besar, perlu dilakukan penyesuaian dengan potensi trafik dan performansi optimum per kanal.Kata Kunci : ABSTRACT: Enhanced Data rates For GSM Evolution ( EDGE) is one of standards for wireless data communication which is implemented to GSM cellular network and as further step in the evolution to mobile multimedia communication. EDGE is the last evolution of the GSM cellular system technology to UMTS/UTRAN ( UMTS Terrestrial Radio Access Network) with the rate of data packet 473,6 kbps. This final assignment will present an analytical model to compare the performance of channel sharing in supporting voice and data transmition by circuit switched and packet switched in GSM/EDGE network. Assignment will research three kinds of channel sharing on uplink and downlink direction, they are : Partial Sharing Schemes, Complete Partitioning serta Complete Sharing Schemes. The comparison of channel Sharing shows the differences network performance which is looked from the average packet delay, blocking probability of packet data and voice, and also the effect of voice call load in the network. The result of research gives recommendation of offered traffic maximum that can be served 1,2673 Erlang for network with total channel (N) = 8 and the voice call load 80%. But, because of voice blocking probability is high in the network, an adjustment upon traffic potential and optimum performance per channel is recommended.Keyword

ANALISA DELAY PAKET PADA SISTEM GPRS MENGGUNAKAN METODE PARSIAL SHARING (Packet Delay Analysis in GPRS System with Partial Sharing Method)

General Packet Radio Service (GPRS) merupakan layanan sistem komunikasi paket data radio, yang berbasis transmisi packet switched. GPRS memanfaatkan kanal fisik yang ada dalam jaringan GSM. Dalam pelaksanaan GPRS dibutuhkan node-node tambahan untuk mengintegrasikan ke dalam jaringan GSM. Node-node tersebut adalah Serving GPRS Support Node (SGSN) dan Gateway GPRS Support Node (GGSN). Tugas akhir ini membahas mengenai model matematis untuk menganalisis probabilitas delay paket pada jaringan GSM/GPRS. Metoda penelitian yang akan digunakan adalah metoda eksploratif. Data yang diperoleh adalah data sekunder yaitu data yang telah diteliti oleh orang lain, kemudian data tersebut diolah dengan menggunakan sistem antrian M/M/n/n untuk layanan suara serta M/M/n/K untuk layanan data (GPRS). Beberapa pokok permasalahan yang dibahas yaitu blocking probability, throughtput dan delay probability paket. Hasil akhir penelitian ini adalah melihat pengaruh dari pengalokasian kanal khusus untuk layanan GPRS terhadap voice blocking probability, data blocking probability, voice throughtput, data throughtput, dan delay probability paket GPRS. Dari analisa didapatkan bahwa dengan meningkatnya jumlah kanal khusus untuk GPRS mengakibatkan penurunan QoS (Quality of service) GSM dan meningkatkan QoS (Quality of service) dari GPR

On the Impact of HARQ on the Throughput and Energy Efficiency Using Cross-Layer Analysis

This paper studies the potential improvements in terms of energy efficiency and system throughput of a hybrid automatic retransmission request (HARQ) mechanism. The analysis includes both the physical (PHY) and medium access (MAC) layers. We investigate the trade-off provided by HARQ, which demands reduced transmit power for a given target outage probability at the cost of more accesses to the channel. Since the competition for channel access at the MAC layer is very expensive in terms of energy and delay, our results show that HARQ leads to great performance improvements due to the decrease in the number of contending nodes – a consequence of the reduced required transmit power. Counter-intuitively, our analysis leads to the conclusion that retransmissions may decrease the delay, improving the system performance. Finally, we investigate the optimum values for the number of allowed retransmissions in order to maximize either the throughput or the energy efficiency

Performance analysis of RTS/CTS protocol over Basic Access in wireless networks

The CSMS/CA protocol is employed in wireless networks in order to overcome issues such as the hidden node problem. This mechanism is expected to handle collisions better using the RTS/CTS mechanism. This method will allow a participating node to take part in communication only if it receives a "Clear to Send" message and thereby, theoretically "avoiding" collision. The objective of this paper is to analyse the improvement that the RTS/CTS mode brings over the Basic Access mode. The paper presents the study of wireless nodes within a specific area with increasing node concentration to verify the performance impact of a protocol in wireless networks, particularly when the node concentration increases

Random Access in DVB-RCS2: Design and Dynamic Control for Congestion Avoidance

In the current DVB generation, satellite terminals are expected to be interactive and capable of transmission in the return channel with satisfying quality. Considering the bursty nature of their traffic and the long propagation delay, the use of a random access technique is a viable solution for such a Medium Access Control (MAC) scenario. In this paper, random access communication design in DVB-RCS2 is considered with particular regard to the recently introduced Contention Resolution Diversity Slotted Aloha (CRDSA) technique. This paper presents a model for design and tackles some issues on performance evaluation of the system by giving intuitive and effective tools. Moreover, dynamic control procedures that are able to avoid congestion at the gateway are introduced. Results show the advantages brought by CRDSA to DVB-RCS2 with regard to the previous state of the art.Comment: Accepted for publication: IEEE Transactions on Broadcasting; IEEE Transactions on Broadcasting, 201