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Some Research Concepts in LTE-A and Sensor NetworkingBY: NILAMADHAB MISHRA | Category: Technology | Submitted: 2013-04-10 01:42:04
Article Summary: "Power redeemable appliance in LTE-Advanced networks, Range-free localization in wireless sensor networks and Data fusion architecture. Here some research talks are focused with brief discussions. .."
1. Power Redeemable Appliance in LTE-Advanced Networks: - In this talk prof Gwo mainly focuses about the basic infrastructure of the LTE-A and the fuzzy DRX power saving mechanism.
In LTE-A standard the peak rate and spectrum efficiency must be considered. Here the radio frame = 10ms, which can be divided into 10 sub frames having each sub frame 1ms.
The discontinuous reception mechanism uses the physical DI control channel to create the DRX cycles, which consists of a series of a sleep cycle and weak up cycle.
How long time a mobile equipment sleeps and weak ups that decided by the I-timer.
The user equipment mainly interact with themselves and also with the base stations and the base station connects to non-3-GGP and internet via evolve packet core.
The speaker after reviewing some works detects his motivations i.e. the modified DRX mechanism, which is named as ISDRX- integrated scheduling DRX.
In this proposed mechanism, the speaker mainly elaborates 4 steps: -integrate strategy of multi flow that include the Qos requirement and the throughput value. - DRX wakeup offset mechanism, - user equipment scheduling, - DRX dynamic adjustment mechanism.
Finally the speaker demonstrates some simulations results to highlight that In ISDRX the average delay is less as compared to PF and RR , but in term of power consumptions the ISDRX consumes little bit more as compared to PF.
2. Range-Free Localization in Wireless Sensor Networks - In range base localization prior information is required to compute the distance between two nodes, whereas in case of range free localization no such prior information is required.
In this talk initially prof Huang highlighted the numerous novel applications of WSN: Emergent System Applications, Environment and Ecology, Health Care and Convenience life, Agricultural Applications, Industrial Applications, Military Applications, Art Applications and Entertainment Applications.
Now to meet those emerging applications the location information is highly important to know where (in which sensor node) the event happening. If thousands of sensor nodes are to be manually deployed, then it is impractical.
If we attach GPS device in each sensor node to measure its location through GPS coordinate system, then it will be energy hunter because GPS will consume more power.
So the speaker uses some assumptions to well define his problem requirements which further lead to propose a Range free WSN localization with aim to reduce the GPS errors.
Here speaker claims that the GPS coordinate and the Anchor base real coordinate have much difference, which must be taking into considerations while estimating the true coordinate of the sensor node
Finally speaker claims that this approach having better performance as compare to other current localizations schemes.
3. Data fusion architecture:-
In centralized architecture, the fusion process is performed at a central node.
Advantage: Erroneous report(s) can be easily detected.
Disadvantage: inflexible to sensor changes and the workload is concentrated at a single point.
In decentralized architecture, each node performs data fusion itself and no gathering of data at a fusion node is required.
Data fusion occurs locally at each node on the basis of local observations and the information obtained from neighboring nodes.
No central processor node.
Advantage: scalable and tolerant to the addition or loss of sensing nodes or dynamic changes in the network.
In hierarchical architecture, the nodes are divided into clusters or levels, and nodes send their data to the higher level nodes for fusion.
Nodes are partitioned into hierarchical levels.
The sensing nodes are at level 0 and the BS at the highest level.
Reports move from the lower levels to higher ones.
Advantage: Workload is balanced among nodes
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