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Dive into the research topics where Peter Skov is active.

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Featured researches published by Peter Skov.


vehicular technology conference | 2009

Channel-Aware Frequency Domain Packet Scheduling for MBMS in LTE

Shan Lu; Yi Cai; Li Zhang; Jike Li; Peter Skov; Chunye Wang; Zhiqiang He

Multimedia Broadcast/Multicast Service (MBMS) provides efficient solution for multimedia broadcasting services by distributing resources among a group of subscribers. Different from previous broadcasting services, MBMS subscribers will send feedback information which can be used to improve system performance by adapting resource allocation to channel state. In this paper in LTE frameworks we propose a Frequency Domain Packet Scheduling (FDPS) algorithm for MBMS, in which resource blocks are dynamically allocated to MBMS based on knowledge of instantaneous channel condition. The objective is to optimize system throughput performance while guaranteeing system coverage. This paper examines the algorithm in details with different (Channel Quality Indicator) CQI reporting modes, alterable frequency bandwidth for MBMS and different numbers of MBMS subscribers per sector. Simulations show that comparing to a simple blind FDPS algorithm, the proposed algorithm improves system throughput without sacrificing coverage.


international conference on communications | 2008

Performance of Fast AMC in E-UTRAN Uplink

Claudio Rosa; Dimas López Villa; Carlos Úbeda Castellanos; Francesco Davide Calabrese; Per-Henrik Michaelsen; Klaus I. Pedersen; Peter Skov

Evolved (E-) UTRA is currently being standardized as a long term evolution (LTE) of the 3GPP radio access technology. One of the goals of E-UTRA is to achieve 2-4 times the spectral efficiency and user throughputs compared to HSUPA/HSDPA. Support for fast link adaptation based on adaptive modulation & coding (AMC) is one of the features being introduced in the E-UTRA specifications to enhance the uplink spectral efficiency. This paper focuses on the performance evaluation of fast AMC in E-UTRA uplink compared to link adaptation schemes that only slowly adapt to the varying channel and interference conditions. It is shown that despite measurement errors and the high variability of uplink inter-cell interference, fast AMC can boost the capacity of E-UTRA uplink by approximately 20% to 25%.


vehicular technology conference | 2009

Reduced Feedback Schemes for LTE MBMS

Yi Cai; Shan Lu; Li Zhang; Chunye Wang; Peter Skov; Zhiqiang He; Kai Niu

In radio resource management of multimedia broadcast/multicast service (MBMS), user equipment (UE) feedback can be used by evolved Node B (eNB) to improve the radio spectral efficiency. As UE feedback is costly we here suggest schemes to reduce the uplink feedback while maintaining the spectral efficiency. For the 3 schemes analyzed in this paper we utilize the special characteristic of a broadcast channel, that spectral efficiency is mainly determined by the UE with lowest channel quality. The performance of the suggested schemes are evaluated with long term evolution (LTE) system simulation and we conclude that using geometry for selecting feedback UEs is the optimal solution and 4 feedback UEs are enough to meet the coverage requirement.


vehicular technology conference | 2009

Optimization of Coverage and Throughput in Single-Cell eMBMS

Li Zhang; Zhiqiang He; Kai Niu; Bin Zhang; Peter Skov

Multimedia Broadcast/Multicast Service (MBMS) based on point-to-multipoint (p-t-m) radio transmission was introduced by 3GPP to deliver broadcast service to a group of user equipments (UEs) in a cellular system. As a broadcast system with uplink feedback, its performance is limited by UEs in poor connections. To utilize the limited radio resource more efficiently, a simple but effective mechanism is proposed to improve the system throughput by sacrificing those UEs that are expensive to cover, which means the cost of this improvement is coverage degradation. We set a threshold for the SINR of UEs, and uplink feedback from UEs with G-factor lower than the threshold will be discarded in packet scheduling and link adaptation. Compared with other methods to increase the throughput, this mechanism has two advantages. First, the coverage can be exactly controlled by adjusting the threshold. Second, much higher throughput gain can be achieved for the same cost. Simulation results show that throughput will be increased by 22% with reasonable coverage degradation when there are 10 UEs per sector. Larger gains can be achieved with more UEs per sector. Keywords-LTE; eMBMS; G-factor; coverage


international conference on communications | 2012

Performance evaluation of coordinated multipoint reception in CRAN under LTE-Advanced uplink

Yuan Huiyu; Zheng Naizheng; Yan Yuyu; Peter Skov

Coordinated Multipoint Processing (CoMP) is a promising method to improve cell edge data rate and system spectrum efficiency, which helps LTE-Advanced to meet the high data rate requirement of 4G mobile communication networks. In uplink, coordinated multipoint reception is transparent to user equipment, while significant gain can be achieved with coordination of multiple base stations. CoMP gain can be affected by network deployment, receiver algorithm, channel estimation accuracy and orthogonality of reference signals. In this article, we focuses on uplink CoMP reception in 3GPP long term evolution advanced (LTE-A). Deployment scenarios are introduced in both homogenous networks and heterogeneous networks. Evaluation are taken under system level simulation. Receiver schemes, realistic channel estimation, and impact of reference signals orthognality is taken into consideration. Performance improvement are shown and compared in different CoMP scenarios.


international conference on wireless communications, networking and mobile computing | 2009

Performance Evaluation of LTE MBMS Baseline

Li Zhang; Yi Cai; Zhiqiang He; Chunye Wang; Peter Skov

MBMS is an efficient means to provide multimedia services by sharing common radio channels among a group of users. This paper presents performance evaluation of MBMS in LTE framework by a simulator set up according to 3GPP standard. A general comparison is first made among point-to-point (p-t-p), point-to-multipoint (p-t-m) and single frequency network (SFN), which shows that p-t-m with feedback is more efficient than p-t-p, and SFN can lead to remarkable performance enhancement. We also elaborate the packet scheduling process of p-t-m with feedback scheme, which involves sector-specific adaptive modulation coding (AMC) and hybrid automatic repeat request (HARQ), and then investigate the gain provided by them. It is shown that with moderate user number, fast AMC and HARQ can give 25% and 70% throughput gain respectively. However, this gain decreases with user number.


international conference on communications | 2011

HARQ Feedback for Carrier Aggregation in LTE-A TDD

Li Zhang; Peng Chen; Peter Skov

Carrier aggregation (CA) is introduced in Long Term Evolution-Advanced (LTE-A) to provide larger bandwidth and higher peak rate for a single user. L1 control signaling design is very critical for implementing CA, and Ack/Nack feedback for CA is particularly challenging in time division duplexing (TDD) mode due to the potential large UL/DL asymmetry and limited transmit power in UL. This paper addresses some key issues for Ack/Nack feedback in TDD CA, namely the Ack/Nack bundling schemes, the number of feedback bits to be supported, and the discontinuous transmission (DTX) state feedback. For the last issue, the concept of bundled DTX feedback is proposed. The impacts of different feedback options on DL throughput are evaluated through simple theoretical analysis and extensive system level simulations, and some design principles are proposed, which can be used as guidance for concrete L1 design.


personal, indoor and mobile radio communications | 2009

Impact of control channel constraints on downlink performance comparison of MIMO transmission schemes in 3GPP LTE

Li Zhang; Zhiqiang He; Kai Niu; Xuzhen Wang; Peter Skov

In spite of the significant performance gain that multiple-input multiple-output (MIMO) transmission can provide in wireless communication, the use of MIMO in realistic systems will lead to large control signaling overhead. Performance comparison of different transmission schemes should consider the control channel (CC) constraints. In this paper, we first build the model of CC for downlink MIMO transmission, which is an extension of previous work in [1], and then we introduce the concept of CC operation point and propose a principle that performance comparison should be with same CC operation point. Three transmission schemes defined in 3GPP long term evolution (LTE), 1×2 maximum ratio combining (MRC), 2×2 open-loop transmit diversity (OLTD), and 2×2 closed-loop spatial multiplexing (CLSM), are compared through system level simulations, and results show that to keep CC operation point constant, the requirements on CC resource are different, which will further influence the spectral efficiency of the transmission schemes.


Planning and changing | 2010

Allocation of Resources

Peter Skov; Chunli Wu


Archive | 2015

SEARCH SPACE ARRANGEMENT FOR CONTROL CHANNEL

Frank Frederiksen; Peter Skov

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Li Zhang

Beijing University of Posts and Telecommunications

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Li Zhang

Beijing University of Posts and Telecommunications

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