A. ASYMMETRIC CA
To ameliorate the spectrum capacity in LTE-Advanced systems asymmetric carrier aggregation should be supported in the uplink and downlink channel; meaning that the number of aggregated component carriers in the downlink channel is different from the number of the of aggregated component carriers in the uplink channel. Asymmetric CA procures ambiguity to the LTE-Advanced eNB in downlink component carrier selection because during a random access process, identifying the downlink component carrier to which UE is attached may be difficult. Therefore, the eNB cannot transmit the random access response to the UE without selecting the exact downlink component carrier. We note that, eNB is the hardware that is connected to the mobile phone network that communicates directly with UEs.
As a solution for this problem, three schemes were suggested:
The first scheme is to configure a physical random access channel (PRACH) on each component carrier with different parameters. In this way, each downlink component carrier will have specific PRACH configuration parameters used to identify this component by the eNB.
The second scheme is to configure all the downlink component carriers with the same PRACH parameters. First, a random access response containing specific transmission configuration parameters and requested information will be transmitted to all the associated downlink component carrier of the uplink carrier used by the UE for transmitting its random access request. Then, when the corresponding eNB receives a further response from the UE, it can identify the corresponding downlink component carrier.
In the third scheme only one downlink component carrier is used to hold out the control channels associated to the rand...
... middle of paper ...
...entation are considered. Because of the spectrum resources rarity, carrier aggregation will endure to be a substantial technique in future communication systems.
Works Cited
[1] S. Ahmadi, “Carrier Aggregation” in LTE-Advanced, 1st ed. USA, ch.13, pp 986-991.
[2] G. Yuan, X. Zhang, W. Wang and Y. Yang, “Carrier aggregation for LTE-Advanced mobile communication systems,” IEEE Communications Magazine, vol. 48, no. 2, pp. 88-93, Feb. 2010.
[3] Z. Shen, A. Papasakellariou, J. Montojo, D. Gerstenberger and F. Xu, “Overview of 3GPP LTE-Advanced Carrier Aggregation for 4G Wireless Communications,” IEEE Communications Magazine, vol. 50, no. 2, pp. 122-130, Feb. 2012.
[4] A. Ghosh, R. Ratasuk, B. Mondal, N. Mangalvedhe and T. Thomas, “LTE-Advanced: next-generation wireless broadband technology,” IEEE Wireless Communications, vol. 17, no. 3, pp. 10-22, Jun. 2010.
When controlling communications of multiple devices are outlined on defined procedures. Arbitration structures are essential in the control of the bus communications in the presence of multiple devices.
COMP09022 Network Design BSc COMPUTER NETWORKING COMP09022 ICMPv6 Prepared by B00270675 13-03- 2015 WORD COUNT (0000) TABLE OF CONTENTS TITLE PAGE……………………………………………... 1 TABLE OF CONTENTS………………………………….. 2 INTRODUCTION TO THE REPORT……………………. 3 TABLE OF FEATURES.......................................................4
On March 8th 2012, C Spire Wireless released details that it would roll out 4G LTE services by September 2012. The investment made by the company is $60 million and they would cover 2700 miles, a population of 1.2 million and more than 360 cell sites in 20 Mississippi markets, most of whom are first time consumers who have access to this high speed technology [1]. Its LTE service was officially launched in September 2012 [3]. An LTE net...
The sender encodes the information and selects the communication channel through which the message is sent, the receiver receives and decodes the message and
Verizon offers a variety of services and products for its customers including: 100% 4G LTE wireless networks, largest portfolio of wireless devices and smartphones in the market, high speed broadband internet, television and interactive devices, and enterprise solutions information technology. The existence and size of Verizon’s current infrastructure as it relates to its retail locations, wireless coverage area, and its global ip network are above peer in comparison with its primary competitors. The global ip network itself spans over 150 countries and more than 2,700 cities. Meanwhile, Verizon is also the U.S. largest wireless provider and has more 4G LTE wireless coverage than all other networks combined.
Have you ever wondered how your phone company started out? Or the new innovations it has brought about? And maybe even how the business is run? Well, today I’m going to talk about AT&T’s history, the products it sells, the employee jobs and U-verse.
.... A. (2012). LTE, LTE-advanced, and WiMAX: Towards IMT-advanced networks. Chichester, West Sussex, U.K: Wiley.
WiMax has the potential of replacing cellular networks, copper wire networks used by telephone companies, and the coaxial cable infrastructure use by cable TV while offering Internet Service Provider (ISP) services. Relevance of trend: Broadband wireless access (BWA) and in particular WiMax is being
Analysis of the Environment of the Mobile Network System Executive Summary 3 Glossary of Abbreviations 4 Introduction 5 Recent History
The entire history of cellular and wireless has been oriented around delivering better service at a higher throughput. Although speeds vary depending on what you are loading, your distance from your cell tower, the phase of the moon and what time and what side of the bed you get out of, Generally 4G speeds are around 1-3 Mega bits per second.
Print. The. Gordon A. Gow, and Richard K. Smith. Mobile and wireless communications: an introduction, McGraw-Hill International, 2006. Print.
G in 1G, 2G, 3G and 4G stands for the “Generation” of the mobile network. Today, mobile operators have started offering 4G services a higher number before the ‘G’ means more power to send out and receive more information and therefore the ability to achieve a higher efficiency through the wireless network. During the time of 1G, radio signals were transmitted in ‘analogue’ form. 2G networks, on the other hand, are based on narrow band digital networks. The 3rd generation of mobile networks has become popular and users access the Internet over devices like mobiles and tablets.
Our guide explores 4G handiness with in the all country and helps you perceive this new wireless broadband technology together with suppliers, compatible instrumentality and network rollout. The pioneer of 4G, EE, was recently joined by O2, Vodafone and last Tesco Mobile to bring the superfast network to over seventieth of the population. As coverage spreads and competition heats up, lets verify if you all be able to get 4G wherever you’re. If you want to check your coverage for 4G service in your area you can check in the internet.
This report will describe the two forms of data communications in terms of the physical interfaces and modes of operation. It will describe the features of data communications equipment in relation to synchronous and asynchronous communication including modems, network terminating units and sending and receiving equipment.
Kim, H & Feamster, N 2013, 'Improving network management with software defined networking', Communications Magazine, IEEE, vol. 51, no. 2, pp. 114-9.