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Monsees, C. Bazzi, P. Weitkemper, K. Ratasuk, A. Prasad, Z. Ghosh, M. Medbo, H. Asplund, J. Bakowski, K. Wesolowski, M. Fodor, S. Sorrentino, S. Mayer, J. Papadogiannis, T. Roger, J. Cabrejas, D. Calabuig, J. Monserrat, Y. Fouad, R. Gohary, H. Lin, P. Lejosne, D. Slock, Y. Thomsen, E. Roger, D.
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Ren, S. It should be able to transmit its own synchronization channels, reference symbols and Bits per symbol 1. As seen, the key Figure 2. In order to phase one. LTE UE will not try to receive the their two-hop relay transmissions.
For perfor- common reference signal or measure the channel mance comparison, our computer simulations quality in an MBSFN subframe that has been adopt a block fading channel model, turbo chan- allocated for eNB-to-RS transmission .
The selection of relay partners i. The value of SNR in these condi- sions, thus improving throughput and coverage tions increases from 2 to 30 dB, as shown in the performance for future relay-enabled mobile X-axis.
From the simulation results, we can see communication networks. On the contrary, in a dis- ciency performance under different radio chan- tributed pairing scheme, each RS selects an nel conditions. This is because the channel appropriate UE unit in its neighborhood by using decoding and selective forwarding procedure in local channel information and a contention-based DCF can completely mitigate the channel fading medium access control MAC mechanism.
Gen- effect at the first hop and then successfully erally speaking, centralized schemes require more restore the original signal for transmission over signaling overhead, but can achieve better perfor- the second hop.
Specifically, a Backward compatibility Yes Yes centralized pairing scheme based on a min-max criterion and the bipartite graph theory is pro- Coverage enhancement Yes Yes posed in , which can minimize the maximal outage probability of all the UE units while Throughput enhancement Yes Yes guaranteeing fairness among them.
In  another centralized pairing scheme is developed Number of hops Two or more Two to enable every UE unit to measure the channel qualities toward its neighboring UE units and Transmission latency introduced Largest Larger then identify a list of relay-capable neighbors by by RSs using a predefined threshold. This information will be sent to the eNB, which will make pairing Table 2.
To the best of our knowl- edge, no distributed pairing scheme has been published for the multiple-RS-multiple-UE sce- eliminated from matrix C. Once an RS is select- nario yet.
In this section we develop and evalu- ed for a UE unit, it cannot be used by any other ate both centralized and distributed pairing UE units if any in its service set. Thus, the schemes for achieving multipath diversity and eNB will clear the values i. Finally, all the columns contain service set. This information needs to be periodi- only one non-zero element i.
After receiving same cell. The overall throughput for the served timely updates from all the RSs in the same cell, UE units can be calculated by adding these non- the corresponding eNB will generate a two- zero values together. If the ith UE is not in the service pairing scheme based on a contention-based set of the jth RS, ci,j is set to zero. Otherwise, ci,j MAC mechanism. Specifically, a common slotted can be calculated based on the instantaneous communication channel is shared by all the RSs channel conditions between the ith UE and the in the same cell.
In practice, only one UE unit at a time, the optimization these parameters N and M can be tuned accord- objective of a centralized pairing scheme is to ing to the densities of RSs and UE units in each maximize the number of served UE units.
Specif- cell, thus to achieve a better performance trade- ically, the eNB will manipulate matrix C by off between collisions and delay in the proposed keeping as many non-zero rows as possible i.
It also evaluates the channel conditions cannot serve more than one UE unit simultane- between itself and the eNB, as well as those UE ously. To achieve the optimization objective, the units in the service set. Then, in the first pairing eNB first searches and keeps those rows with section of the distributed pairing procedure, only one non-zero element; that is, the UE units those RSs with a single-UE service set each ran- with only one RS in their vicinities are given domly selects a time slot from the N slots in this high priority to be paired with their only RS.
Besides being an explanatory text about LTE-Advanced air interface technology, this book exploits the technical details in the 3GPP specification, and explains the motivation and implication behind the specifications. After a general description of wireless cellular technology evolution and the performance targets and major technical features of LTE-Advanced, LTE-Advanced Air Interface Technology discusses various innovative technical features in detail, including. Innovative concepts in carrier aggregation techniques Collaborative multipoint CoMP theory and performance analysis Enhanced multiantenna solutions or multiple-input, multiple-output MIMO technology, in particular, multiuser and multilayer MIMO Relaying issues Self-organizing and heterogeneous networks Interference suppression and enhanced intercell interference coordination eICIC technology.
This book opens the door of LTE-A technology for practitioners in any stage of wireless communications. Beginning with basic communication principles, the book demonstrates how a complete wireless theory is built. Readers can work independently on original case studies and simulation programming examples, with an emphasis on technology and performance.
Designed for professionals interested in gaining an upper hand, this book is the ideal educational and informative resource in the emerging field of air interface technology. He has been working for China Mobile for 20 years as a technical expert with a solid understanding of wireless communication technologies. He has worked for China Mobile for many years, and has extensive knowledge on wireless communication systems and data communication networks. He now works for Ericsson, which he joined in , and is actively participating in leading-edge LTE product design and implementation.
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