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25 March 2010, Volume 8 Issue 1

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The whole issue of ZTE Communications March 2010, Vol. 8 No. 1

2010, 8(1):  0. 

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Guest Paper

Good Wishes for 2010

Zhao Houlin

2010, 8(1):  1-3. 

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Strategic Thinking of the Internet of Things and M2M Services

Qi Qingzhong

2010, 8(1):  4-7. 

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Special Topic

Architecture and Performance of Next Generation Cooperative RAN

Chen Mo, Wang Qixing, Cui Chunfeng

2010, 8(1):  8-12. 

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The next generation Radio Access Network (RAN ) is evolving in a distributed style with network architecture flattening out. Base stations in the next generation RAN cooperatively optimize the radio resource allocation to improve spectral efficiency. In addition, base-band pool technology reduces the CAPEX and OPEX of RAN by greatly improving the efficiency of resource usage and decreasing the space requirements for equipment.

Cognitive Radio and Multi- Dimension Cooperative Communications

Yang Guang

2010, 8(1):  13-16. 

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(The perspective on Cognitive Radio (CR ) technology has turned to a "network and system" framework. To enhance a system ’s cognitive capability and reduce cognitive costs, cooperative means must be adopted. As physical layer link technologies suffer from a bottleneck in performance improvement, multi-dimension cooperation among different network elements will certainly be a main approach to enabling mobile communication systems. Awareness of context and users ’service characteristics is the critical base for intelligent cooperation and joint resource management. Therefore, the combination of CR with multi-dimension cooperative communications has become an inevitable trend.

Evolution a nd Interference Analysis of Cooperative Communication Systems

Sun Huixia

2010, 8(1):  17-20. 

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Frequency division design sacrifices the built-in macrodiversity gains of 3G systems, making it difficult to fully exploit the advantages of Long Term Evolution (LTE ) technology. As a result, for LTE Advanced (LTE-A ), cooperative communication technology is proposed. System-level cooperative communications can maximize system performance. To achieve system-level gains, high spectrum efficiency and reliable performance, cooperative communication technology is required. With the introduction of technologies such as multi-point transmission/ reception, intelligent relay, and cooperative antenna, LTE-A system ’coverage is enhanced. The handover between user terminals can also be stably realized and the traffic and Quality of Service (QoS ) in handover areas improved.

Distributed Space- Time Coding in LTE System

Wei Guo, Zhang Chao, Wang Lei

2010, 8(1):  21-25. 

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Relay is considered as one of the candidate key technologies of LTE-advanced for it brings broader cell coverage and higher system capacity. Distributed Space-Time Coding (DSTC ) not only exploits the spatial diversity from the relay structure, but also brings some coding gains. According to the performances of existing DSTC schemes, the Demodulate-and-Forward (DMF ) scheme is the best candidate for DSTC in LTE-Advanced system. Moreover, a threshold-based selective relaying scheme for DSTC is proposed to solve the error propagation of DMF. This scheme can achieve excellent performance gains at the cost of little system complexity.

Study of Relay Node Selection Techniques for Cooperative Communication Networks

Zhang Yan, Sheng Min, Li Jiandong

2010, 8(1):  26-30. 

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Emerging as a new communication paradigm, cooperative communication is attracting attention. Relay selection is the key technology for cooperative communication, and determines whether the performance gain of cooperation can be achieved. In this paper, we first give the performance evaluation metrics for relay selection algorithms, and then discuss the corresponding categories. Finally, some classical relay selection algorithms are analyzed. Results show that the relay node should be seriously selected and configured according to system requirements in order to optimize the performance of cooperative communication.

Handover Mechanism in Coordinated Multi-Point Transmission/Reception System

Xu Xiaodong, Chen Xin, Li Jingya

2010, 8(1):  31-35. 

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Coordinated Multi-Point (CoMP ) transmission/ reception technology has been the focus of much attention recently and has becom a key research interest in 3GPP LTE-Advanced due to its ability to improve both cell-edge and average system performance. However, CoMP technology requires brand-new handover mechanism, or else its real performance will be limited. This paper proposes a novel handover mechanism supporting CoMP based on the handover scenario in CoMP communication system architecture, including information sharing and signaling transmission procedure of CoMP cooperating sets handover and CoMP transmission points selection/update. The proposed scheme could not only support CoMP well, but also reduce the overhead of information exchange and signaling transmission.

Joint Processing Precoding for Coordinated Multi-Point Transmission in LTE-A

Wei Ning, Li Shaoqian, Yue Gang

2010, 8(1):  36-39. 

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Coordinated Multi-Point (CoMP ) transmission is a technology targeted for Long Term Evolution Advanced (LTE-A ). It is designed to reduce cell-edge interference, improve cell-edge spectrum efficiency and enlarge effective cell-edge coverage by means of multi-point coordination including coordination between Remote Radio Units (RRUs ) within an eNodeB, coordination between an eNodeB and its relays, and coordination between eNodeBs. The Joint Processing (JP ) technique for CoMP can maximize system performance, which is achieved mainly with channel information-based precoding algorithms. Precoding methods perform differently in various CoMP scenarios. Currently, research focuses on compressing the feedback and optimizing codebook design in order to optimize precoding algorithms.

Joint Transmission Method in Coordinated Multi-Point Transmission and Reception Systems

Sun Yunfeng, Jiang Jing, Hu Liujun

2010, 8(1):  40-43. 

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In this paper, we propose a multi-point joint transmission method for Coordinated Multi-Point (CoMP ) systems. This solution combines space time/frequency coding and precoding with beamforming technology. The multi-path data obtained by space time/ frequency coding and precoding can be mapped by beamforming technology to multiple coordinated nodes for transmission. The signal receiver can also obtain bigger diversity gain and beamforming gain as well through the combination of space time/frequency coding and beamforming. Moreover, precoding and beamforming can help the signals transmitted from separate nodes in CoMP system combine at the receiver, which makes the signals at different layers more independent and obtains beamforming gain.

Cooperative Communication Based on Spectrum Aggregation in LTE Further Evolution

Diao Xinxi,Xu Ling,Ma Zhifeng

2010, 8(1):  44-49. 

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The implementation of wide band radio transmission may occur in two parallel ways: designing a new system with larger bandwidth, or constructing a cooperative system based on existing systems. The former is a spectrum aggregation scheme based on multi-carrier transmission within one system, while the latter fulfills spectrum aggregation based on multi-carrier transmission among systems. On the one hand, the advantage of the multi-carrier transmission scheme within a system and among systems is that the existing Radio Frequency (RF ) techniques and elements can be sufficiently utilized, so system costs can be decreased. On the other hand, spectrum aggregation among systems, especially among heterogeneous air -interfaces, can not only expand the basic bandwidth functions, but also fulfill efficient spectrum usage for Frequency Division Duplex (FDD ) system under the unbalanced Uplink/Downlink (UL/DL ) service scenario. It can also efficiently guard band usage between FDD and Time Division Duplex (TDD ) systems. Commercially, this has significant implications for operators.

Research Paper

Distributed Image Compression Algorithm in Wireless Multimedia Sensor Networks

Yang Xiaobo, Sun Lijuan, Wang Ruchuan

2010, 8(1):  50-54. 

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Because of the high bandwidth demands of multimedia data, the transmission of raw data collected at sensor nodes consumes a large amount of resources. Distributed image compression is proposed as a means of overcoming the computation and energy limitation of individual nodes by sharing the processing of tasks. In addition, it prolongs the overall lifetime of the network by assigning compression tasks to idle nodes.

Development Field

Technical Analysis on Application Layer Error Control in IPTV

Xia Hongfei, Lü Xiaopeng, Liu Feng

2010, 8(1):  55-59. 

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When they provide Internet Protocol Television (IPTV ) services, IP networks face difficulties such as reduced transmission bandwidth, delay, jitter, and packet loss. A terminal-centric solution can improve the image quality by adding control policies like congestion control and error control to the receiving terminal and source code. An end-to-end application layer reliability method is usually required to satisfy IPTV requirements in the IP network. Application Layer Forward Error Correction (AL-FEC ) technology solves the problem of packet loss, and can ensure the end-to-end reliability for IPTV services.

Lecture Series

Cloud Computing (1)

Wang Bai, Xu Liutong

2010, 8(1):  60-62. 

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