Huawei UCN Research and Practice

Huawei UCN Research and Practice A NEW CONCEPT In recent years, DSL systems have faced many new challenges, such as crosstalk. The standardized DMTs modulation techniques are deployed more densely than ever, making radio resources allocation a severe challenge to address. Insertion of additive guard bands like cyclic prefixes led to the addition of new deal. These insertions are not enough to simply improve the capability of a single traditional DMT transceivers to counteract the impact of the crosstalk. It lies that network development requires a new way of thinking. Based on an optimization-based perspective, next generation DMTs require coordinate network nodes, frequencies and bands, and uniformly arrange network resources, and capable to provide optimal user experience. Therefore, Huawei established a new concept: User Centric Network (UCN). User Centric Network (UCN) is a concept of user-centric network construction. In traditional network construction, base stations were centered, and users were served by a certain base station. As users may be located in different places, it is a challenge to ensure stable and reliable performance for users. Interference between adjacent base stations also reduces the resource efficiency of the entire network. With the new concept of UCN, resources are coordinated, combined, and optimized in allocation, based on a user-centric philosophy so that the user experience will be enhanced. UCN is also a new user-centric concept in term of operation. In the traditional way, operators can just sell simple data packages to customers. USER BENEFITS UCN focuses on users it can provide a lot of benefits for end users. First, UCN can eliminate cell boundaries, providing noborder service experience and improving the peak and average rates. Second, UCN enables multiple cells to receive signals from terminals in a coordinated way, reducing requirements for transmit power of terminals and prolongs their standby time. Third, UCN uses flexible networks, providing customized services and tariff packages for users. UCN AND 4.5G, 5G Here we have to emphasize that UCN is a network construction concept beyond the definition of wireless technology generations. UCN and 4.5G or 5G are not simply a one-to-one relationship. UCN can be implemented phase by phase in 4.5G and 5G. For example, UCN technologies can be used in the 4.5G phase, such as distributed MIMO. Distributed MIMO uses distributed, multi-site, multiple antenna beamforming and multiuser multiplexing technologies on the RAN side to reduce interference and increase capacity. In the recent field trials, distributed MIMO proved 3- to 4- folds of cell capacity. RECENT RESEARCH ON UCN At present, the number of base stations deployed on 4G networks has reached several millions. The recent research on UCN focuses on how to apply the leading-edge UCN concept to these base stations early. We are pleased to see that the entire industry has made successful progress in UCN research. CloudRAN-based technological innovation such as distributed MIMO can ideally control intersite interference and enable extremely dense deployment of sites, without the need to upgrade terminals on live networks. 4.5G distributed MIMO has been put into trial use on live networks for advanced operators. For example, the inter-site distance of lamp pole sites on Shanghais Bund is as short as 50 m. With distributed MIMO, the data rate of cell edge users has increased from 8.2 Mbps to 15 Mbps, an improvement of 80%, and the average cell throughput has increased from 45 Mbps to 65 Mbps, an increase of 45%. Minimum Mean Square Error (MMSE) Estimation for Interference Identification We are interested in an estimate of the time-varying channel gain matrix. It is obtained by means of a statistical estimation approach that combines the measurements with (i) statistical knowledge of measurement uncertainty, and (ii) prior knowledge of spatial correlation of the interference links. We assume known positions of the transmitted and received vectors and known noise vectors from which the a priori distribution of the channel gain matrix with a mean and a covariance matrix is derived. Statistical knowledge about the channel gain vector and measurement uncertainty is exploited. Given some physical-layer measurements, an ideal linear model in which the prior distribution of the interference matrix and the uncertainty distribution is Gaussian in linear scale is derived. This model relates the measurements to the channel gain vector and therefore can be used to derive an optimal linear MMSE (LMMSE) estimator for the channel gain vector. Since interference is often assumed to have a log-normal distribution, a more realistic model in which the prior path-loss distribution is log-normal and the uncertainty distribution is Gaussian in dB scale is used. In this case, the model becomes non-linear, and therefore a closed-form linearized MMSE estimator, named linearized log MMSE (LLMMSE), is derived to estimate the channel gain vector. The results presented here show how the accuracy of interference estimation obtained from the proposed MMSE Estimator is affected by two syste m parameters, namely the Reference Signal Received Power (RSRP) uncertainty à Ã†â€™ and the channel variance à Ã‚ . The performance of the MMSE is compared to the simple least squares (LS) estimator. The simulation results in Figure 2-2 show that the proposed MMSE estimator outperforms the LS estimator. The gains are large for high noise levels or when the channel variance à Ã‚  is small. The performance in low noise situations is similar to the LS performance as in such cases the solution of the MMSE estimator converges to the one of the LS estimator. Same behaviour is observed when the channel variance is high.

Case Study Report of Secom Essay

This is a rental service of the equipment. Before they started this service, a security company sent the guard man to its customers. However, this system was not effective to make the company large because if the company became larger, the manager should employ too many people to manage. To avoid this situation, SECOM decided to change the security system from employing people to leasing the machine. In order to come true this system, Iida and Toda had to calculate the cost and profits in very detail. SECOM’s service covers many kinds of fields such as medical-fields, informational-fields and environmental-fields. This is because SECOM wants to give the total safe to its customers. Even if SECOM’s service fields spread, it still keeps its own philosophy and strategy based on philosophy. Thus, SECOM has been a strong enough company to survive Japanese unstable economy. However, there is a problem in the company: a successor problem. 3. Problems Now, SECOM has a strong leader, Makoto Iida, but he is 61 years old and has to think about a successor. However, there is no appropriate person who can lead the company and survive in this society. 4. Analysis of the current situations 1) One cause for the successor problem is the growing speed of the company. SECOM has been growing for 30 years, but these years are not enough to think about a successor. (2) Another cause for the successor problem is the difficulty for raising a leader. SECOM’s philosophy is also Iida’s philosophy, and he wants his successor to follow this philosophy. However, any successor will be different from Iid a. Iida thinks that â€Å"What I can tell him is no more than a half of all that he must learn (Keio Business School, 1994). † 5. Propose strategic solutions Solution A: Iida will help the successor until the new system will be stable as an outside chairman. Pros: Iida can advise to his successor when the successor cannot make clear decision. Moreover, the successor can follow the Iida’s philosophy and strategy. Cons: If Iida disappear suddenly, the system and company will be shocked by his disappearance. Solution B: To choose an efficient leader from other company. Pros: (1) SECOM does not have to think about raising the successor, because this new leader is already efficient for running the company. (2) By receiving an outside person, SECOM can get a new point of view in it. Cons: (1) An outside person, who does not know the culture of the company, may break the old but efficient system for SECOM. (2) The new leader comes from other company, so he may not be able to have support from the company’s member and may be isolated. 6. Decision-making Solution B will be the most appreciate solution of the successor problems. 7. Conclusion SECOM is growing with Iida and Toda and with their strategies. However, it needs new points of view to survive this society. Any company should adapt to the changeable society, or it will disappear.

Stem Cells And Its Effect On The Body Essay - 2078 Words

Stem cells can be used to create different cells in the body. All stem cells can divide overtime to create another stem cell or a new type of cell which will have a more specialized role in the body. These new cells can function in different areas in the body and create different types of tissues such as a muscle tissue, a kidney tissue, a skin tissue, a lung tissue, and a brain tissue. There are different types of stem cells: embryonic stem cells, adult stem cells, and induced pluripotent stem cells. Embryonic stem cells which can be taken from the embryo. According to the National Institutes of Health (2016), â€Å"Embryonic stem cells are derived from embryos. Most embryonic stem cells are derived from embryos that develop from eggs that have been fertilized in vitro and then donated for research purposes with informed consent of the donors.† These cells can develop and form any tissues in a living organism. The adult stem cells are cells of the body. The National Institutes of Health 92016) states â€Å"The adult stem cell can renew itself and can differentiate to yield some or all of the major specialized cell types of the tissue or organ. The primary roles of these cells are to maintain and repair the tissue in which they are found.† The adult stem cells are found in many tissues and organ systems in children and adults. Lastly, the induced pluripotent stem cells are genetically modified and reprogramed cells to embryonic stem cells. They are divided and grown in a laboratoryShow MoreRelatedStem Cells And Its Effects On The Body885 Words   |  4 Pages Stem cells have remarkable potential to develop into many different cell types during early life and growth in the body. Different tissues serve as all sorts of internal repair systems, dividing essentially without limit to replenish other cells as long as the person or even animal are still alive. When stem cells can divide, they can turn into new cells and have the potential either to remain a stem cell, or become another type of cell with a more specialized function. A cell with a specializedRead MoreStem Cells And Its Effect On The Human Body1407 Words   |  6 PagesIntroduction Stem cells are unspecialized cells of a multicellular organism and it has capability changing into any type cell. When stem cells divides, the new cell has the potential of choosing whether to stay a stem cell or turn into any type of specialized such as: skin cells, neurons, muscle cells and many more. Stem cells have no specific function but are special in their own way. In the early stage of the development, stem cells have the extraordinary potential to develop into any type of cell in theRead MoreThe Effects Of Stem Cell On The Human Body2802 Words   |  12 Pagesincurable but embryotic stem cells may hold the cure. With that said, many researchers in the medical field have become quite involved in the study of stem cells. A stem cell is an immature cell that has the potential to become specialized into different types of cells throughout the body. There are two different types of stem cells: adult stem cells and embryonic stem cells. These cells are important because they hav e the ability to repair damaged tissue in the human body. Although they are bothRead MoreStem Cells And Its Effects On The Human Body998 Words   |  4 PagesStem cells are undifferentiated cells that have potential to be developed into many different specialized cell types, such as skin cells, bone cells, muscle cells, and many more. Stem cells used in research today derive from mainly two sources, embryos from the blastocyst phase of embryological development, known as embryonic stem cells, and adult tissue, known as adult stem cells (â€Å"Stem Cell Basics†). 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Many people think stem cell research should not be allowed, due to the fact that researchers mostly use stem cells from embryos. But, if an eight year old boy’s life can be extended or even saved through the stem cell surgery, the research using stem cells should continue. In 1978, an important discovery was uncovered in our medical world; stem cells were recognized in human cord blood (Murnaghan, â€Å"History of Stem Cell Research† N.p). With the discovery of stem cells, researchersRead MoreStem Cells Essay1530 Words   |  7 Pages Stem cells are used every day throughout the United States to help cure diseases and save lives. Stem cells can also be used to study labor defects so that future birth deficiencies can be prevented or reversed. Although as a college student starting a family may not be on your mind yet, it is always beneficial to educate yourself on current trends and new discoveries in stem cell research. 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A Separate Peace Essay 11 - 996 Words

A Separate Peace Essay Betrayal, one of the most horrible things you could do to anyone your family, a friend anyone. To me it’s one of my all time most hated things a person could do and it’s almost unforgivable. In this book A Separate Peace by John Knowles two boys Phineas and Gene who are best friends at a boarding school in New Hampshire experience some of the worst kinds of Betrayal you could think of. Gene commits a very bad betrayal when he jousts the tree limb they are both standing on ending up with Finny falling and badly breaking his leg. This was no accident because Gene can’t stand the guilt. After the accident Gene is allowed to go see Finny in the hospital and gets interrupted when he’s about†¦show more content†¦This story is a good example of taking things for granted and not realizing that a best friend is a gift and shouldn’t be taken for advantage. You never really know what you got until it’s gone and when ità ¢â‚¬â„¢s gone it’s gone forever and Gene had to learn that the hard way. Throughout this story these two are on a roller coaster full of twist and turns and fighting and betrayal. You can learn a lot from these situations and how to avoid them because if you’re like me you can’t stand people who betray and even worse their best friend. Pushing someone out of a tree isn’t going to change who they are on the inside. To do that you need to talk with them and if you are friends like you say you are then they should listen to what you have to say. I know if my friend was doing something that was making me want to kill them or even hurt them id sit them down look them in the eye and tell them how I feel. Betrayal is a bad thing and especially with friends you have to have trust that’s the main component for having a good friendship with someone. 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