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- Karimi, H. Reza, et al.
(författare)
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Switched Multi-Radio Transmission Diversity for Non-Collocated Radio Accesses
- 2006
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Ingår i: 2006 IEEE 63RD VEHICULAR TECHNOLOGY CONFERENCE, VOLS 1-6. - 9780780393912 ; , s. 167-171
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Konferensbidrag (refereegranskat)abstract
- We evaluate the spectral efficiency gains observed through multi-radio transmission diversity (MRTD), whereby packets of data are jointly scheduled for downlink transmission over multiple independent radio accesses. We specifically address downlink switched MRTD employed across macro- and pico-cellular radio accesses with non-collocated base stations in a hierarchical cell structure. It is shown that while significant gains can be achieved via MRTD among collocated macro-cell (or pico-cell) base stations, tight cooperation across non-collocated macro- and pico-cell base stations is only beneficial for a small subset of possible geometries. The impact of CQI reporting delays is also investigated.
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- Koudouridis, George, et al.
(författare)
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Feasibility Studies and Architecture for Multi-Radio Access in Ambient networks
- 2005
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Konferensbidrag (refereegranskat)abstract
- Ambient Networks is a new networking concept that targets forthcoming dynamic communication environments; characterized by presence of a multitude of different wireless devices, radio access technologies and network operators that can form instant inter-network agreements with each other. In order to facilitate such dynamically composed networks a Multi-radio Access (MRA) architecture has been devised consisting of Multi-Radio Resource Management (MRRM) and Generic Link Layer (GLL) functionality. One of the key objectives of the MRA architecture is the efficient utilization of the multi-radio resources by means of effective radio access selection mechanisms. In this paper the functions of MRRM and GLL and their role in multi-radio access selection are explained. In addition, the results from a series of evaluation studies are presented emphasizing the scenarios where MRA approach shows significant gains in the overall system performance. This work has been performed as part of the Ambient Networks project, an integrated project within the EU IST 6th Framework Programme.
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- Koudouridis, Georgios P., et al.
(författare)
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Switched multi-radio transmission diversity in future access networks
- 2005
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Ingår i: VTC2005-FALL. - 0780391527 ; , s. 235-239
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Konferensbidrag (refereegranskat)abstract
- In this paper we study packet scheduling algorithms which exploit multi-radio transmission diversity in a multi-radio access network. We view the packet scheduling process as a combination of user scheduling and radio access allocation. A number of such schemes are proposed and their performance is evaluated via simulations in a multi-cell environment. It is shown that the use of such schemes across a total of six uncoupled radio accesses can result in average gains of up to 60% in spectral efficiency, as compared to scenarios where the radio accesses operate independently.
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- Widberg, K, et al.
(författare)
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Self- and manual mobilization improves spine mobility in men with ankylosing spondylitis--a randomized study
- 2009
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Ingår i: Clinical rehabilitation. - : SAGE Publications. - 1477-0873 .- 0269-2155. ; 23:7, s. 599-608
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Tidskriftsartikel (refereegranskat)abstract
- Aims: To evaluate effects of physiotherapeutic intervention in terms of self- and manual mobilization on chest expansion, vital capacity, posture, spine mobility and experienced consequences of the disease in patients with ankylosing spondylitis. Design: A prospective, randomized controlled study. Methods: Thirty-two men, aged between 23 and 60 years, with ankylosing spondylitis were randomized to active or no treatment for eight weeks. Physiotherapeutic intervention included individualized self- and manual mobilization for 1 hour twice a week and individually adjusted home exercises. Two blinded investigators made the assessments of chest expansion, posture and spinal mobility before and after the treatment period. The patient filled in three and the physiotherapist one of the four Bath Ankylosing Spondylitis scales (BAS scales). Results: In the treatment group chest expansion increased at the level of processus xiphoideus (P<0.01), with no difference in vital capacity compared with the control group. The posture improved in the cervical (C7—wall distance) (P<0.001) and in the thoracic spine (P<0.05). Thoracic and lumbar spine flexion improved (P<0.01) as did sagittal range of motion P<0.001 and P<0.01, respectively. The Bath Ankylosing Spondylitis Metrology Index total scoring improved (P<0.001) in the treatment group compared with the control group. The other three BAS scales showed no differences between groups. At four months follow-up of the treatment group, cervical spine posture, lumbar flexion and range of motion as well as BAS Metrology Index were still improved. Conclusion: This study shows that eight weeks of self- and manual mobilization treatment improved chest expansion, posture and spine mobility in patients with ankylosing spondylitis.
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