Channel allocation for GPRS

Based on the GSM radio architecture, the general packet radio service (GPRS) provides users data connections with variable data rates and high bandwidth efficiency. In the GPRS service, allocation of physical channels is flexible, i.e., multiple channels can be allocated to a user. We propose four algorithms for the GPRS radio resource allocation: fixed resource allocation (FRA), dynamic resource allocation (DRA), fixed resource allocation with queue capability (FRAQ), and dynamic resource allocation with queue capability (DRAQ). We develop analytic and simulation models to evaluate the performance for these resource allocation algorithms in terms of the acceptance rate of both GPRS packet data and GSM voice calls. Our study indicates that DRAQ (queuing for both new and handoff calls) outperforms other algorithms     

A bandwidth-on-demand strategy for GPRS

General packet radio service (GPRS) is a global system for mobile communications (GSM) packet data service. In order to efficiently accommodate GPRS traffic while maintaining the desired service quality of GSM calls, we propose a GPRS bandwidth-allocation strategy called the bandwidth-on-demand (BoD) strategy. The BoD strategy is adaptive to the change of traffic conditions, and thus can dynamically adjust the number of channels for GSM and GPRS traffic. Taking the effect of packet dropping due to movements of mobile stations into account, this paper develops an analytical model to study the BoD performance in terms of GSM-call-blocking probability and GPRS-packet-dropping probability.     

vGPRS: A Mechanism for Voice over GPRS

This paper proposes vGPRS, a voice over IP (VoIP) mechanism for general packet radio service (GPRS) network. In this approach, a new network element called VoIP mobile switching center (VMSC) is introduced to replace standard GSM MSC. Both standard GSM and GPRS mobile stations can be used to receive real-time VoIP service, which need not be equipped with the VoIP (i.e., H.323) terminal capabilities. The vGPRS approach is implemented using standard H.323, GPRS, and GSM protocols. Thus, existing GPRS and H.323 network elements are not modified. Furthermore, the message flows for vGPRS registration, call origination, call release and call termination procedures are described to show the feasibility of our vGPRS system.     

GPRS若干关键技术的分析与研究

通用分组无线业务（General Racket Radio Service,GPRS）作为GSM网络新的承载服务,解决了传统GSM网中数据传递慢、计费方式单一的缺点,本文重点是对GPRS移动性管理和无线资源分配做了详细分析,并对GPRS计费原则做了进一步的研究。     

The Complementary Use of 3G WCDMA and GSM/GPRS Cellular Radio Networks

The traffic performance of integrated 3G wide-band code division multiple access (WCDMA) and GSM/GPRS network is evaluated. This type of network links two cellular radio systems which have different set of frequency bands and the same coverage size. The base station of 3G WCDMA is installed on an existing GSM/GPRS site. Dual-mode mobile terminals use handoff to establish calls on the better system. The soft handoff or inter-frequency hard handoff occurs when mobile terminals of 3G WCDMA or GSM/GPRS move between two adjacent cells, respectively. The inter-system hard handoffs are used between 3G WCDMA and GSM/GPRS systems. The data rate conversions between different systems, soft handoff region size, multiple data rate multimedia services, and the effect of the mobile terminal mobility on the user mean dwell time in each system are considered in the study. The simulation results demonstrate that a great traffic performance improvement on the complementary use of 3G WCDMA and GSM/GPRS cellular radio networks compared with the use of GSM/GPRS cellular radio networks. When high-data rate transmission is chosen for low-mobility subscribers, both the handoff failure probability, and carried traffic rates increase with the new call generation rate. However, both rates decrease conversely with the increasing new call generation rate as soon as the new call generation rate exceeds a critical value. This causes the integrated networks saturation. The higher mean speed for the mobile terminals produces lower new call blocking probabilities and total carried traffic. The new call blocking probabilities and total carried traffic increase with the size of the soft handoff region.     

AMR技术在无线通信系统中的应用

分析了在无线通信系统中引入AMR技术的优点,以及时系统容量和语音质量的影响。在对GSM/GPRS系统仿真的基础上,得出了一些反映无线通信系统性能参数的仿真结果,如阻塞率、语音质量在引入AMR技术后的改善情况。     

Performance analysis of channel de-allocation schemes for dynamic resource allocation in GSM/GPRS networks

Channel de-allocation for GSM voice call (DASV) has been considered for dynamic resource allocation in GSM/GPRS networks. Two new de-allocation schemes are proposed: de-allocation for GPRS packet (DASP) and de-allocation for both GSM voice call and GPRS packet (DASVP). An analytic model with general GPRS data channel requirement is derived to evaluate the performance of the schemes in terms of GSM voice call incompletion probability, GPRS packet dropping probability, average GPRS packet transmission time and channel utilisation.     

手机上网一基于GSM的通用无线分组业务综观

讨论一种基于GSM的新型移动分组数据承载业务,即通用无线分组业务(GPRS).着重就其网络特性、影响GPRS发展的因素等作了初步探讨.     

Design and performance analysis for data transmission in GSM/GPRSsystem with voice activity detection

To efficiently utilize the bandwidth of cellular mobile systems and offer service of high quality to both voice and data users, we propose a protocol to integrate packet-switched data traffic into current time-division multiple-access (TDMA)-type circuit-switched digital voice systems. We analyze the performance of the proposed system, which transmits data packets in the silent periods of a conversation with voice activity detection and adapts itself to the GSM/GPRS system, which uses the idle channels to provide data services. We show that the proposed protocol can increase the bandwidth utilization efficiency and improve the throughput/delay performance of the data transmission while minimizing the impact on the current GSM/GPRS service     

"通信原理"课程的系统级实验建设

本文分析了“通信原理”课程教学实验的现状,结合最新科研成果设计并实现了“通信原理”系统级实验,包括数字基带仿真、服务发现、局域网接入、电话网接入、语音传输、数据传输、图像传输、无线多点组网、通信系统性能评价和GSM／GPRS接入。     

基于MPC850的GPRS三峡库区水质监测系统

通用分组无线业务是在GSM网络上开通的一种新型的分组数据传输业务,该业务主要具有＂高速＂和＂永远在线＂的优点,正是由于该种优点,用于实时监测将会取得很好的效果。主要介绍了基于MPC850的通用分组无线业务三峡库区水质监测系统,结合三峡库区的实际情况,给出了系统的总体设计,分析了单片机MPC850对数据的采集、处理和发送的基本原理,并介绍了软件实现方法。由于设计的通用性,该系统模型还可用于水文、气象、农情等方面的监测。     

A Wireless Hydrocarbon Pollution Measuring and Monitoring System

The goal of the proposed system is to protect sensitive areas of the country from hydrocarbon pollution with the use of a global system for mobile communications/general packet radio service (GSM/GPRS) accessed from mobile observation points (MOPs). The primary applications of this system are detection of leaks from an underground or aboveground storage tank (UST/AST), monitoring waste water discharge/ monitoring bilge water, monitoring water quality, monitoring groundwater, monitoring oil-water separators, monitoring storm drain effluents, and static soil gas headspace analysis. The basic version of the system is equipped with: a GPS position locator, a contamination probe sensitive to hydrocarbons, and a GSM/GPRS connection with the central www server     

Supporting IP QoS in the General Packet Radio Service

The General Packet Radio Service is the current enhancement in the GSM infrastructure, capable of handling Internet protocol traffic for mobile computing and communications. A major deficiency of the current GPRS specification is the lack of adequate IP quality of service support. Two schemes for enhancing the GPRS architecture with the existing IP QoS support architectures, IntServ and DiffServ, are proposed. Solutions are proposed to the problem of establishing QoS reservations across the GPRS core network, and the required signaling enhancements and modifications in the components of the GPRS architecture are identified. Of the two proposed schemes the IntServ one requires frequent refreshing of state information and extra signaling. To quantify the effect that signaling overhead has on GPRS operation and performance, a simulation model of the proposed IntServ architecture was developed, which includes models of the GPRS cellular infrastructure, network traffic, and user movement. The obtained simulation results show that the proposed IntServ architecture demonstrated good scalability, even for large user populations     

Gain/bandwidth programmable PA control loop for GSM/GPRS quad-band cellular handsets

The analog power amplifier (PA) control loop of a fully integrated GSM/GPRS quad-band transceiver, suitable for GSM 850, GSM 900, DCS 1800, PCS 1900, and GPRS class 12 applications is presented. The control loop is based on a fully integrated PA controller (PAC) which meets applicable 3GPP GSM/GPRS specifications. Both the gain and the bandwidth of the PA control loop are programmable as well as the standby voltage delivered to the external PA: these features, together with a high driving capability (8.4 mA at 2.5 V), make this solution capable of interfacing many combinations of PAs, couplers, and detectors. The PAC has been integrated in a BiCMOS SiGe 0.35-/spl mu/m process and measures 0.33 mm/sup 2/. The current consumption from a single 2.8-V power supply is 2.8 mA without load and 7.2 mA in the application using Hitachi's PF08109B PA.     

WCDMA业务分析

3G的成功主要取决于业务，WCDMA系统采用开放的业务平台，使具体的业务与网络承载相分离，极大地提高了业务的灵活性，终端的设计也更加开放。与GSM业务相比，WCDMA业务的提供方式有较大变化，其业务价值链更为丰富。另外，WCDMA的业务完全兼容GSM/GPRS的业务。本对以上内容进行了分析和讨论。     

基于Q2400系列模块的无线数据传输设计

Q2400系列模块是Wavecom公司生产的基于GPRS/GSM(通用分组无线电业务/全球移动通信系统)网络的无线数据传输模块,工作于900(850)MHz/1800(1900)MHz,使用高性能GPRSClass 10提供完整的2.5G(第2.5代)GPRS/GSM语音和数据容量.文中介绍了模块的功能和调试手段,给出了基于模块的无线数据传输系统的设计方法.由于技术难度最大的高频电路部分和射频部分都在无线模块内部处理,无疑大大减小了硬件的开发难度.     

PTT packet delay analysis for GPRS/GSM links

Push-to-talk (PTT) is a new mobile service that enables fast-access and two-way communication between two or more users. This paper develops an approximate evaluation model for PTT delay performance in GPRS/GSM networks based on a quasi-stationary assumption and an M/G/1 processor sharing queueing model. Numerical results are presented in order to illustrate the effect of traffic load and other design parameters on PTT packet delay.     

Quality of Service Management in GPRS-Based Radio Access Networks

In this article, the performance and capacity gain achievable with quality of service (QoS) management in packet switched radio networks based on the General Packet Radio Service (GPRS) are examined. Both the functions defined in the GPRS specification for QoS support and implementation-specific strategies for subscriber- and application-based Connection Admission Control (CAC) and scheduling are introduced. The feasibility of QoS provisioning in mobile core networks with use of DiffServ compared to present IP technology realizing a pure Best-effort service is examined in addition. To achieve this, simulation results of GPRS performance and system measures for different load situations are produced with the simulation tool GPRSim that models the realistic traffic behavior of a GPRS network.