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In this paper, we consider a four-node relay-based OFDMA system. The expression of the upper bound for the achievable rate in Successive Relaying (SUR) protocol is derived by using the cut-set theorem for half-duplex systems. Based on this expression, the near-optimal solution of the achievable rate is obtained in the joint power and subcarrier allocation constraint, according to the dual problem...
Considering that the ITU IPR policy does rather little to help the 3G standard-in fact, 3G is struggling in the patent mire, arguably, it is time to rethink the ITU IPR policy. Under the current policy, no one could know with reasonable assurance how many patents will implicate the standard in question; how will they be licensed, one by one, or via patent pool, or the combination; how much the total...
In a beyond 3G context, many wireless technologies can cooperate or interoperate, within dynamic and reconfigurable networks. In this changing radio environment, the challenge for the cognitive terminal is to be able to connect to the relevant network, according to several criteria. E2R has developed concepts and solutions for a Cognitive Pilot Channel (CPC) to bring enough information to the terminals...
For the evolved UTRA (EUTRA), cell edge bit-rate and system throughput become important criteria for the evaluation of the system proposals and requirements on the system performance. Inter-cell interference is the main source of performance degradation for OFDM, especially the data rate of cell edge UEs is severely limited. Many inter-cell interference mitigation schemes are proposed to improve the...
B3G wireless networks are expected to be characterized by the pouring of different radio access technologies (RAT) and diversified service requirements. In parallel with this, the irreconcilable conflicts between the great demand for radio spectrum and its scarcity bring the issues of dynamic spectrum management (DSM) and efficiency in spectrum utilization into our sight. This article aims to investigate...
Since 3G long term evolution (LTE) is launched by 3GPP recently, many multiple access (MA) schemes have been proposed for 3G LTE, such as multi-carrier (MC) - WCDMA, MC-time duplex-synchronized CDMA (MC-TD-SCDMA), orthogonal frequency division multiple access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), which includes IFDMA (interleaved FDMA) and DFT-S OFDM (DFT-spreading...
This paper proposes an effective solution for improving downlink cell edge performance-fast cell group selection (FCGS) scheme. The definition and features of FCGS are illustrated and intra-node B FCGS and inter-node B FCGS schemes are explained respectively. The advantages of FCGS vs. hard handover, soft handover and fast cell selection are analyzed. Finally, the capacity analyses and simulation...
One of the major challenges for LTE (long term evolution) of 3G networks is efficient mobility management. This paper discusses the proposed architecture of mobile IP-RR (regional registration) and distributed dynamic architecture in the wireless communication. The aim of this paper is to provide reference to the mobility technical innovation of 3G systems evolution by exploiting mobile IP. Because...
As the evolution of 3G, long term evolution (LTE) standardization activity is issued in 3GPP and 3GPP2. In previous paper OFDMA is proposed for downlink of LTE. As the channel reciprocity can be obtained in TD-SCDMA LTE system, the channel status information (CSI) can be exploited at the transmitter to obtain the spatial-frequency multiuser diversity by joint spatial-frequency subcarrier and antenna...
This paper introduces a general framework of B3G (Beyond 3G) mobile communication system in China TDD (time division duplex) Special Work Group. System architecture is described that allows the integration of multiple antenna techniques, e.g., MIMO (multiple input multiple output), in physical layer and the novel cellular architecture, e.g., group cell, in network layer. MIMO techniques based on group...
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