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Random access algorithm is critical for the performance of interactive broadcasting system. Random access with Dynamic Window Size and Random Access Slots(D-WS-RAS) is proposed as an efficient way to tackle this problem in the interactive broadcasting system. This algorithm is composed of three parts: utilize Bayes' rule to estimate the number of access, dynamically set backoff window size and dynamically...
We experimentally demonstrate error-free Intra-PON Flow transmission via a QPAR node. Simulations show Intra-PON outperforms regular PON in waiting time, blocking probability, throughput and energy consumption. Adaptive Intra-PON features up to 20% network cost reduction.
Coordinated multi-point (CoMP) transmission is a promising technique to suppress inter-cell interference (ICI) in LTE-Advanced system. With perfect channel state information (CSI) at the transmitter, joint beamforming methods can be used to completely cancel ICI and significantly improve the spectrum efficiency. However, in FDD system, the transmitter can't obtain perfect CSI to eliminate ICI, for...
Opportunistic routing employs transmission coordination mechanism (TCM) to reduce the total number of packet transmissions so as to improve end-to-end throughput. Existing paradigms use batch map to record the progress of packets transmitted in batch mode towards to destination, and then achieve distributed transmission coordination by exchanging batch map among candidate forwarders. However, the...
LTE-Advanced system based on orthogonal frequency division multiplexing (OFDM) can eliminate intra-cell interference since data are carried on the orthogonal subcarriers; however, it can not mitigate inter-cell interference (ICI) which affects the performance severely. Therefore, coordinated multiple point (CoMP) reception scheme was proposed to reduce ICI and improve the cell capacity for the uplink...
To further improve and satisfy the spectral efficiency requirements addressed in LTE-Advanced system, in this paper, a Coordinated Multi-Cell MU-MIMO scheme is proposed to achieve this goal, especially to enhance the cell-edge user(the 5% of user throughput) throughput substantially. In our proposed cooperative scheme, we adopt multi-cell block diagonalization (BD) algorithm to perform joint procession...
LTE-Advanced system which based on orthogonal frequency division multiplexing (OFDM) can eliminate intra-cell interference but still can not mitigate inter-cell interference (ICI). Coordinated Multi-Point transmission/reception (CoMP) is one of the candidate techniques for LTE-Advanced systems to increase the cell average and cell edge user throughput in the both uplink and downlink. Although CoMP...
LTE-advanced system which based on orthogonal frequency division multiplexing (OFDM) can eliminate intra-cell interference but still can not mitigate inter-cell interference (ICI). In this paper, we propose a novel cooperative multi-cell multiple-input multiple-output (MIMO) scheme for LTE-advanced system to reduce ICI and improve the cell capacity. By sharing information such as data and channel...
In IEEE 802.16e mobile WiMAX system, since mobile stations (MSs) send bandwidth request (BR) messages to base station (BS) during contention period when they need uplink channel to transmit data in the case of multicast polling or broadcast polling, the uplink performance is affected by the size of the contention period in the uplink subframe. The access delay will be increased if the size of the...
Mobile WiMAX as an OFDMA (Orthogonal Frequency Division Multiple Access) mobile broadband air interface is a solution to the requirements for mobile internet services. It has been accepted by ITU as 3G standard last year. The work presented in this paper focuses on evaluation of the Mobile WiMAX system performance in which Full-Queue and VoIP traffic are considered both in downlink and uplink We have...
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