Adaptive Subframe Allocation for Next Generation Multimedia Delivery Over Hybrid LTE Unicast Broadcast

The continued global roll-out of long term evolution (LTE) networks is providing mobile users with perpetually increasing ubiquitous access to a rich selection of high quality multimedia. Interactive viewing experiences including 3-D or free-viewpoint video require the synchronous delivery of multip...

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Bibliographic Details
Published in:IEEE transactions on broadcasting 2016-09, Vol.62 (3), p.540-551
Main Authors: Christodoulou, Louis, Abdul-Hameed, Omar, Kondoz, Ahmet M., Calic, Janko
Format: Article
Language:English
Subjects:
Allocations
Broadcasting
cellular networks
Coding
Digital multimedia broadcasting
Dynamics
E-MBMS
H.264 MVC
Hubs
LTE
Mobile communication
Mobile computing
Modulation
Multicast
Multimedia communication
Resource management
Streams
Subframes
Unicast
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Summary:The continued global roll-out of long term evolution (LTE) networks is providing mobile users with perpetually increasing ubiquitous access to a rich selection of high quality multimedia. Interactive viewing experiences including 3-D or free-viewpoint video require the synchronous delivery of multiple video streams. This paper presents a novel hybrid unicast broadcast synchronisation (HUBS) framework to synchronously deliver multi-stream content. Previous techniques on hybrid LTE implementations include staggered modulation and coding scheme grouping, adaptive modulation coding or implementing error recover techniques; the work presented here instead focuses on dynamic allocation of resources between unicast and broadcast, improving stream synchronisation as well as overall cell resource usage. Furthermore, the HUBS framework has been developed to work within the limitations imposed by the LTE specification. Performance evaluation of the framework is performed through the simulation of probable future scenarios, where a popular live event is broadcast with stereo 3-D or multi-angle companion views interactively offered to capable users. The proposed framework forms a "HUBS group" that monitors the radio bearer queues to establish a time lead or lag between broadcast and unicast streams. Since unicast and broadcast share the same radio resources, the number of subframes allocated to the broadcast transmission are then dynamically increased or decreased to minimise the average lead/lag time offset between the streams. Dynamic allocation showed improvements for all services across the cell, whilst keeping streams synchronised despite increased user loading.
ISSN:0018-9316
1557-9611
DOI:10.1109/TBC.2016.2570020