FRAMEWORK, IMPLEMENTATION AND ALGORITHM FOR ASYNCHRONOUS POWER SAVING OF UWB- MAC WITH STEERABLE DIRECTIONAL ANTENNA IN MANETS

International Journal on AdHoc Networking Systems (IJANS) Vol. 9, No. 2, April 2019
DOI: 10.5121/ijans.2019.9201 1
FRAMEWORK, IMPLEMENTATION AND ALGORITHM
FOR ASYNCHRONOUS POWER SAVING OF UWB-
MAC WITH STEERABLE DIRECTIONAL ANTENNA
IN MANETS
Murtala Muhammad1
, AbubakarGidadoHalilu2
and Sanusi Mohammed Bunu3
1
Department of Computer Science, Adamawa State University, Mubi, Adamawa State,
Nigeria.
2
School of Computing, Science and Engineering, University of Salford, Manchester.
M5 4WT
3
Department of Computer Science, Adamawa State Polytechnic, Yola, Adamawa State,
Nigeria.
ABSTRACT
Asynchronous Power Saving (APS) technique is one of the unique standard used in Mobile Ad hoc
Networks to conserve more energy in the system. This technique when combined with other power saving
systems like Ultra WideBand System and the use of Directional antenna in MANETs provides astonishing
result. In designing Medium Access Control (MAC), developing a framework and giving a detailed
implementation procedure are among the factors that hinder the process; specifically in MANETs not to
mention the Algorithm. This paper aimed at exploring a standard framework, implementation procedure
and Algorithm for designing an Asynchronous Power Saving Ultra WideBandMeduim Access Control
(UWB-MAC) in MANETs using directional antenna. An implementation procedure that comprises of
transmission, channelization, and receiver pattern of the Physical layer is specified in this research work.
The paper concludes with an algorithm for an Asynchronous Power Saving UWB-MAC using a Steerable
Directional antenna in MANETs.
KEYWORDS
MANETs, UWB-MAC, Asynchronous Power Saving, Steerable Directional Antenna
1. INTRODUCTION
The adaptation of Asynchronous Power Saving (APS) techniques in transmission and reception
in the design and implementation of Ultra WideBand-Medium Access Control (UWB-MAC) in
Mobile Ad hoc Networks (MANETs) is because, the techniqueis more realistic than other
standards and also enable long operation time for battery powered devices[1]. This is achievable
through providing framework, implementation and detailed algorithm that will ease the design
procedure. The APS standard uses an effective method to extend battery life specifically at the
MAC layer and enable devices to turn off completely or reduce power for long periods of
time[2]. The specified period of time for the standard to extend battery life is relative to the
superframe duration. With the aid of Ultra Wideband system combined with the APS technique,
the proposed MAC protocol is capable of saving enormous in MANETs[3]. During the
transmission or reception period, APS standard offers two different power management modes
for the devices to operate on: active and hibernation modes. The active mode transmits and
receives beacons in every superframe in the communication medium, while hibernation mode is
capable of hibernating multiple superframes that come as a result of cross communication, and

2
therefore halts the communication process by dropping the transmitting or receiving frames in
those superframes[4]. Subsequently, the technique stretches its capability to support devices that
sleep for a particular portion of a superframewhich leads to maximum power saving by the
protocol. The aim of this paper is to present a detailed framework, implementation procedures
and proposed algorithm of a UWB-MAC using APS techniques in MANETS while utilising
directional antenna system.
In this paper, the use of directional antenna as a unique contribution, this have been achieved by
specifying the direction of transmission based on a specific angle of arrival, neighbours are co-
ordinated by indicating the intention to hibernate and each device includes a hibernating mode in
its beacon. The reason for the hibernating mode is to specify the number of superframes in
process[4]. This technique will save enormous amounts of energy by putting non-active devices
in sleep mode and thus, will not allow devices to send or receive beacons or any other frames.
The operation mode of the proposed asynchronous power saving model is to operate efficiently
only if the time spent in that model is greater than a certain threshold.
The major advantage of using the APS model in the implementation of the proposed UWB-MAC
is to reduce contention in the communication medium due to the fact that nodes wake up at
different time instances[5]. Another benefit attached to using the APS model is that it allows each
node in the communication environment to set its own sleep/wake schedule independently[6].
Finally, using the APS model will support the devices to be in Asynchronous mode, meaning
they do not have to be synchronised together all the time. At the later end, after presenting the
framework of the proposed protocol and the implementation procedure, the algorithm for the
implementation of the APS for the proposed UWB-MAC with a steerable directional antenna
system will also be presented.
The paper is organised as follows after introduction as section one. Section two of this paper
present the framework of the proposed concept and is among requirement that are captured in the
title of the paper after implementation and algorithm as major keywords. Section three is the
transmission implementation aspect of the physical layer followed by channel and modulation
procedures in section four. The receiver part is section five while section six is the multiband-
OFDM implementation. The main objective of the paper which is the Asynchronous Power
Saving UWB-MAC with directional algorithm is presented in section seven. And finally, section
eight concludes the paper before the references.
2. FRAMEWORK OF THE PROPOSED APS UWB-MAC
Media Access Control (MAC) protocols have different frameworks that varies depending on
types, structures and implementations[7]. This paper managed to come up with a proposed
framework of the protocol is based on the OSI model architecture from the application layer to
the physical layer. The application layer is assumed to refer to multimedia transmission over a
multi-hop network and is characterised by sensing activities, channel coding improvement and
time varying channel conditions as presented in Figure 1. The transport layer of the proposed
protocol is UDP. The test of heavy multimedia applications like VoIP is assumed for testing the
viability of the protocol. The network layer signified the use of multi-hop connections with
multiple devices to express the nature of MANETs and MB-OFDM support. This also signifies
that there exists a communication link between all the devices in the network, all of which are
mutually independent. That means each node is capable of laying packets for other nodes in the
network with a traverse of multiple nodes in order access a destination device.

Figure 1: APS
The implementation of the MAC layer, based on the conceptual framework indicated in Figure 1,
is obtained by defining three basic mediums: the spectrum scheduling/sharing, energy
optimisation entities and the quality of service of the proposed UWB
scheduling/sharing technique is Frequency
4.49GHz centres. Testing these three sub
paper because[8] has covered such a gap. The suitable task done by the FH is to help select the
best code for executing sub
frames of data. Transmission and reception are synchronised to the hopping sequenc
assumed to involve fast hopping which changes the frequency several times in order to transmit a
single bit.
The second entity of the proposed UWB
the spectrum scheduling of the frequency
distances between the nodes, propagation channel, Antenna Height and directivity. The behaviour
of the proposed system relies on these entities to determine the output of the system. The quality
of the proposed protocol based on network quality of service (QoS) parameters such as
throughput, delay, total energy consumed at the MAC layer and total numbers of packet drop in
the communication medium have been measured. The output varies with the changes in resp
to entities of the antenna used and the direction of transmission.
Generally, the PHY layer is responsible for frequency generation, frequency selection,
modulation, signal detection and data encryption
sensing strength of the MIMO channe
of QPSK performance with respect to changes in the measured entities at the MAC layer. This
determines the digital modulation used,Analog
the internal resolution of the First Fourier Transformation (FFT) algorithm. These are the factors
on which the power management depends at the PHY stack of the protocol. In addition, it also
determines the data rate of the system, transmitting power, receiving power and de
of the devices participating in the system although, the performance of the sensing aspect of the
PHY stack is beyond the content of this research study. Other sections of the PHY stack are Bit
Error Rate (BER), directivity, adaption and cha
existence of the MIMO system for multi
the antenna directivity. At the PHY layer, the research focused on the directivity entity as the
measure concerned with determining the output of the system. Directivity depends on the antenna
Figure 1: APS Framework of the Proposed UWB-MAC
three basic mediums: the spectrum scheduling/sharing, energy
optimisation entities and the quality of service of the proposed UWB-MAC. The spectrum
scheduling/sharing technique is Frequency-Hopping (FH) with 3 sub-bands of 3.43, 3.96 and
Testing these three sub-bands for performance precision is beyond the research
has covered such a gap. The suitable task done by the FH is to help select the
best code for executing sub-channels within the channel and to perform encoding/decoding
frames of data. Transmission and reception are synchronised to the hopping sequenc
The second entity of the proposed UWB-MAC, is energy optimisation which can be iterated after
the spectrum scheduling of the frequency-hopping. These are data rate, density of the network,
osed protocol based on network quality of service (QoS) parameters such as
the communication medium have been measured. The output varies with the changes in resp
to entities of the antenna used and the direction of transmission.
modulation, signal detection and data encryption[9]. However, this paper focused mainly on the
sensing strength of the MIMO channel to determine how MB-OFDM performs and the capacity
determines the digital modulation used,Analog-to-Digital Converter (ADC/DAC) resolution, and
ution of the First Fourier Transformation (FFT) algorithm. These are the factors
determines the data rate of the system, transmitting power, receiving power and de
Error Rate (BER), directivity, adaption and channel coding enhance. BER determines the
existence of the MIMO system for multi-system transmission and it also serves as a link between
determining the output of the system. Directivity depends on the antenna
3
three basic mediums: the spectrum scheduling/sharing, energy
MAC. The spectrum
bands of 3.43, 3.96 and
bands for performance precision is beyond the research
has covered such a gap. The suitable task done by the FH is to help select the
channels within the channel and to perform encoding/decoding
frames of data. Transmission and reception are synchronised to the hopping sequence and
MAC, is energy optimisation which can be iterated after
ing. These are data rate, density of the network,
osed protocol based on network quality of service (QoS) parameters such as
the communication medium have been measured. The output varies with the changes in respect
. However, this paper focused mainly on the
OFDM performs and the capacity
Digital Converter (ADC/DAC) resolution, and
ution of the First Fourier Transformation (FFT) algorithm. These are the factors
determines the data rate of the system, transmitting power, receiving power and deep sleep power
nnel coding enhance. BER determines the
system transmission and it also serves as a link between
determining the output of the system. Directivity depends on the antenna

4
gain, angle of arrival, antenna height and the efficiency of the antenna. These will determine the
power consumed at the PHY stack with respect to modulation and spectrum usage.
Aside from ordinary data packets, VoIP is used as the targeted multimedia application to test the
viability of the proposed UWB-MAC. VoIP is typically a very heavy application and requires the
enhancement of channel coding to obtain an optimised version of the protocol. Thispaper
considered the use of High Speed Packet Access (HSPA) in order to improve download and
upload speeds of the voice communication within the PHY stack. The impact of HSPA
transmission over the UWB communication channel will stabilise the protocol because of the
Band3 usage, thus allowing an additional noise to the channel by the repeater at the UWB
working frequencies.
3. TRANSMISSION IMPLEMENTATION OF ASP UWB-MAC
The implementation of the transmitter section, this study considered the Wireless Sensor
Network standard module which is also based on the PHY properties of the 368 standardneeds to
be considered. In this case, a complete communication system is modelled, based on the
proposed model using a MATLAB Simulink that include elements of transmitter and receiver
components array. The transmission section includes an initiating transmitter, transmitting
spectrum and input/output transmitter array as presented in Figure 2. Additionally, the system
was modelled using Simulink in order to integrate the proposed model to mimic a real PHY layer
of the system. The transmitting section generates the input signal through the channel model that
alternates the signal noise and passes it to the receiving array and to the beamformer for
directivity.
Figure 2: Transmission Path of ASP UWB-MAC
While running the simulation, the desired direction of the transmission could be changed or reset
to 220
to yield low power in the medium. When the receiving angle is changed or reset to a
different degree, for example 900
, the power of the receiving angle increases, thus compensating
for the power between 220
to 900
. When the receiving signal direction is set to 220
, the same as
with the transmitting direction, the power also decreases. Subsequently, this integrates the
channel and modulation techniques applied to the transmitter in order to forward a proper signal
to the receiver.
4. CHANNEL AND MODULATION TECHNIQUES APPLIED TO THE
TRANSMITTERS
The channel and modulation techniques applied to the proposed model supports the UWB system
with high frequency and maximum data support through the channel for proper implementation
of the proposed UWB-MAC. Thepaper adapts the MIMO channel system in the implementation
of the proposed model and combines the two possible techniques in the MIMO system that is,
multiplexing and beamforming. The reason for integrating both techniques is that multiplexing

increases the effective data rate by sending parallel beams of data on different antennas at the
same time[10], while the beamforming technique focuses on particular narrow angle/signal
beams in the direction of the receiver, enhancing the signal reliability
multiplexing techniques in the MIMO system are represented by line of transmission patterns
from the upstream to the downstream (in MANET from DEVt to DEVr).
in-between the transmitting and the receiving ends which co
and beamforming. Before arriving at the beamformer from the transmission channel, a UWB
interfering signal is added to the desired signa
made on the independent direction from which both the desired and interfering signals are
received.
The UWB channel controls the wide band signal monitors the signal and arriva
signal by combining the concept of beamforming and multiplexing. Figure 4 presents the UWB
section of the PHY stack.
The mathematical formulation of the MIMO channel has been used to increase the data rate and
possibly transmit several information streams in parallel where a special multiplexing technique
is applied. The transmitting and receiving sections of the channel can be presented in a vector
spaces formulation and later converted into matrices.
Tx can be ⋮ and is the T transmit sample across the channel and is also T
Rx can be ⋮ and is the Receiving sample across the channel and is also R
Therefore, the two vectors can be represented as an
represent the entire wireless channel as in:
⋮
Equation 1: Input/output System of the MIMO Channel
The T-dimensional vector can be represented by
We can pass the input to the wireless channel which is the T
to the output of the wireless system R
transforms the T-dimensional vector into R
fective data rate by sending parallel beams of data on different antennas at the
, while the beamforming technique focuses on particular narrow angle/signal
beams in the direction of the receiver, enhancing the signal reliability[10]
from the upstream to the downstream (in MANET from DEVt to DEVr). The channel is placed
between the transmitting and the receiving ends which co-ordinate more of an angle of arrival
interfering signal is added to the desired signal. When running the simulation, changes can be
Figure 3: Channel Connection
The UWB channel controls the wide band signal monitors the signal and arriva
Figure 4: UWB Channel
spaces formulation and later converted into matrices.
and is the T transmit sample across the channel and is also T-dimensional vector.
and is the Receiving sample across the channel and is also R-dimensional vector.
Therefore, the two vectors can be represented as an input/output system through the channel to
represent the entire wireless channel as in:

⋮ 1
Equation 1: Input/output System of the MIMO Channel
dimensional vector can be represented by and R-dimensional can be represented by
We can pass the input to the wireless channel which is the Tx vector through the MIMO channel
to the output of the wireless system Rx vector (
.
⇒
.
⇒ . Therefore, the MIMO channel
dimensional vector into R-dimensional and this can be technically converted
5
fective data rate by sending parallel beams of data on different antennas at the
, while the beamforming technique focuses on particular narrow angle/signal
[10]. The streams of
The channel is placed
ordinate more of an angle of arrival
l. When running the simulation, changes can be
The UWB channel controls the wide band signal monitors the signal and arrival direction of the
dimensional vector.
dimensional vector.
input/output system through the channel to
dimensional can be represented by .
vector through the MIMO channel
refore, the MIMO channel
dimensional and this can be technically converted

6
into a matrix. The matrix takes an input as T-dimension and the output to be R-dimension vector.
Equation 2 is the resulting equation of the channel model can be:
= "
# + %
# 2
Equation 2: Resulting Equation of the Channel Model
Where 1
rx
w is the noise of the channel which is also informed of receiving a signal. H can be
represented as r x t dimensional vector with a channel coefficient of:
" = '
⋮

⋮
⋯
⋯
⋯
⋯
⋮
) (3)
Equation 3: Channel Coefficient of the Channel
The r-rows are the receiving signal while the t-columns are the transmitting signal. The
coefficient of H as in hi,j (i,jth
) coefficient which means ith
row and jth
column are the channel
coefficient that represents transmitting antennas of the DEVs in the wireless network. Therefore,
hi,j is nothing but the channel coefficient between ith
receiving antenna and jth
transmitting
antenna. The total number of channel coefficients in the wireless system is the product of
receiving and transmitting signals (r * t). For example, h3,2 is the channel coefficient of 3rd
receiving DEV and 2nd
transmitting DEV.
5. RECEIVER IMPLEMENTATION OF ASP UWB-MAC
The receiver section uses a feedback loop and the block comprises an estimated angle of
reception and beamforming algorithms that assumes the two signals are received. The root
multiple signal personification (Music) algorithms are used as adapted in[11]. The block
estimates two directions and each are processed to the control logic to decide the angle that
provides the best modulation regression. The estimated angle is passed to another block of
direction of arrival tool box that performs minimum value distortion less response. The block
preserves the signal power at the given direction which supresses interference noise coming from
other direction. The beamforming angle determines the use of the control logic and the signal
strength used to determine which of the two ways of estimated angle provides the lower
modulation regression. The particular beamforming algorithm provides excellent tracking of the
desired signal even when the interference signal is stronger than the expected signal.
Figure 5: Reception Path of the proposed ASP UWB-MAC
Considering the receiving signal spectrum, the effect of non-linear behaviour occurs due to high
power when the angle of transmission is wide. Therefore, from all indications, the direction of
arrival has an impact on the system, especially when the direction is wide, and this shows that the
proposed model performs better. A correlation of the estimated direction of arrival is made along

7
with the spectrum of the receiving signal after beamforming to the constellation of the resulting
receive signal when changing the direction of arrival. The receiver recalculates a real weight of
the signal in order to maximise the modulation.
The complete PHY layer of the ASP UWB-MAC is the combination of the three basic designs:
transmitting, channel and receiving sections. Figure 6 presents the complete diagram of the PHY
layer.
Figure 6: Complete PHY Stack of the ASP UWB-MAC
It is reasonable to elaborate further on the channel utilisation process and the reasons behind
adopting MB-OFDM in the design process rather than other techniques. Section 6 elaborates
more on the MIMO channel (MB-OFDM channel).
6. MULTIBAND-OFDM IMPLEMENTATION ON THE MIMO CONFIGURATION
The choice of MB-OFDM for the implementation of the proposed UWB-MAC is based on its
robust nature towards multi-path communication[12]. It is easier to implement in terms of
spectrum sculpting and the technique is less prone to interference in relation to other technologies
like narrowband systems[10]. Narrowband communication systems do not accommodate
resilience with regards to high interference within their operational bandwidth limits. Series of
data can be modulated using a Gaussian monocycle pulse train, as stated in [13]. It implies using
pulse position modulation (PPM).
Basically, Figure 5.7 describes the MB-OFDM Physical layer with all the numbers of groups in
the channel. The groups have 528MHz bands in four distinct groups.
Figure 7: Multi-Band OFDM Physical Layer[14]
The groups are as follows:
i. Group A: is destined for the 1st
generation devices and the frequencies range from 3.1 -
4.9GHz.
ii. Group B: is reserved for future use and the frequencies range from 4.9 – 6.0 GHz.
iii. Group C: is intended for devices with improved SOP performance with frequencies range
from 6.0 – 8.1GHz.
iv. Group D: is also reserved for future use with frequencies range from 8.1 – 10.6GHz.

8
Another consideration that prompted the use of the multi-band approach over other techniques
like DS-UWB, is its high spectral efficiency inherent in OFDM and its high resilience to RF
interference to other RF signals. Apart from robustness to multi-path effect by MB-OFDM as
mentioned earlier, the standard is a proven technology used in an indoor environment like other
wireless MAC standards for both PHY and MAC layers.
In Multi-Band OFDM (MB-OFDM), the approach divides the available UWB frequency
spectrum of the channel (3.1 GHz to 10.6 GHz) into multiple, smaller paths and no overlapping
bands with bandwidths greater than 500MHz. The standard is similar to the narrowband
frequency-hopping techniques, with more advantage of eluding transmission over certain bands.
Figure 8: OFDM Modulation Pattern
The study revealed a maximum of 7.5GHz for UWB 5 channels and channels 1-4 have 3 sub-
bands each while channel 5 has 2 sub-bands. In the channels, each sub-band occupied 528MHz.
The OFDM symbol of the channel has 128 sub-carries and can transmit each symbol for one time
slot per channel. The concept of cyclic prefixing has been used to reduce the complexity of the
reception (Rx) circuitry with multi-path resistance from a prefix of 60ns and the use of simple
multiplication operations in place of Shift-Multiply-Add in frequency domain although strong
consideration has not been placed on the time frame for each and every channel to switch
between which is the Guard Interval (GI) and Closed Proximity (CP). However, the default of
9.5ns GI to switch between channels in the communication path has to be considered. To avoid
experiencing high latency and redundancy in the proposed UWB-MAC, average GI and CP
values have been used and to refrain from complicated channel switching of hardware circuitry,
the use of short GI has been avoided. Part of the targeted aim in the proposed UWB-MAC is to
decrease high overhead and accumulation of multi-path signal strength. Thus, larger CP adoption
was not pursued, rather, an adoption of a CP duration of direct proportion to the delay spread in
the channel.
The implementation of the MB-OFDM component of the proposed system involved MATLAB
coding functions and graphical results are found by showing the Bit Error Rate (BER) of the
system. The BER of the MB-OFDM for the entire system has been determined by plotting a
Signal to Noise Ratio (SNR) as shown in Figure 9. To achieve the alleged accurate localisation
through the physical layer, BER is controlled in terms of declining to yield maximum throughput.
Meanwhile, SNR is also controlled to yield maximum throughput. Moreover, these factors (BER
and SNR) are major sources for energy inefficiency in MANET.

Figure 9: MB
The complete PHY stack is linked to the UWB
(APS) model for implementation to save energy in the communication setup.
7. ASYNCHRONOUS POWER
STEERABLE DIRECTIONAL
The proposed UWB-MAC protocol algorithm is designed to ensure that, after issuing the RTS
command in the transmission process, no member of the extended beacon group transmits a
beacon frame at the same time as the device in order to avoid collision. Thus, in line with the
algorithm steps, information included in beacon frames is designed to facilitate c
frame exchanges by ensuring that a device does not transmit frames while a neighbour is
transmitting or receiving frames. To permit correct frame reception, the UWB
algorithm attempts to ensure that a device(s) is/are unique wit
group and direction of transmission is specified otherwise the process will reinitiate for a certain
number of times before terminating the process.
The strategy for the implementation of the proposed UWB
on the APS model is to enable all neighbours in the communication environment to have an
overlapping time between their wake periods: the wake period constitutes a preamble and data
frame in order to save more energy in the medium. The
mode as in below.
Figure 10: Asynchronous Scheme of the Proposed UWB
7.1. Main Algorithm for Proposed APS UWB
Figure 9: MB-OFDM BER vs SNR Implementation
The complete PHY stack is linked to the UWB-MAC using the Asynchronous Power Saving
model for implementation to save energy in the communication setup.
OWER SAVING ALGORITHM FOR UWB-
IRECTIONAL ANTENNA
MAC protocol algorithm is designed to ensure that, after issuing the RTS
the transmission process, no member of the extended beacon group transmits a
algorithm steps, information included in beacon frames is designed to facilitate c
transmitting or receiving frames. To permit correct frame reception, the UWB
algorithm attempts to ensure that a device(s) is/are unique within the device's extended beacon
number of times before terminating the process.
The strategy for the implementation of the proposed UWB-MAC with directi
frame in order to save more energy in the medium. The scheme has a transmitting and receiving
Figure 10: Asynchronous Scheme of the Proposed UWB-MAC
.1. Main Algorithm for Proposed APS UWB-MAC
9
MAC using the Asynchronous Power Saving
-MAC WITH
MAC protocol algorithm is designed to ensure that, after issuing the RTS
the transmission process, no member of the extended beacon group transmits a
algorithm steps, information included in beacon frames is designed to facilitate contention-free
transmitting or receiving frames. To permit correct frame reception, the UWB-MAC protocol
hin the device's extended beacon
MAC with directional antenna based
scheme has a transmitting and receiving
MAC

10
Item i): outline the transmitting algorithm and item ii): outline the receiving algorithm for the
proposed UWB-MAC with steerable directional antenna system. The receiving mode has two
additional checking modes for the protocol that is, checking the channel before transmitting and
channel checking with receiving mode.
(i) Transmitting and channel determination algorithm
1. Procedure Algorithm ( ) UWB-MACpConSer Algorithm
2. Time = simulationTime do
3. using a directional RTS packet to transmit
4. is there a valid neighbour(s) within angleOfTransmission? and angleLessThan3600
5. If (PTx>=minx) OR (PRx>= MinRx) then
6. Transmit data → yes
7. else
8. Initiate another transmission process with different angle < 3600
9. Is there any blockage or hidden node(s)?
10. If yes then
11. Hibernate non-active devices by putting them on sleep mode
12. Put the channel in idle direction mode
13. If No then
14. Perform line 7 and go to line 3
15. Else
16. Is the channel free to transmit?
17. If yes
18. Transmit with full UWB channel capacity
19. Else
20. Put the channel to idle sensing mode
21. Successful transmission
ii. Receiving and channel determination algorithm
1. Procedure Algorithm ( ) UWB-MACpConSer Algorithm
2. Time = simulationTime do
3. using a omni-directional CTS packet to transmit
4. is there a valid neighbour(s) within angleOfReception? and angleLessThanOrEqual3600
5. If (PTx>=minx) OR (PRx>= MinRx) then
6. Transmit data → yes
7. else
8. Initiate another transmission process with different angle =< 3600
9. Is there any blockage or hidden node(s)?
10. If yes then
11. Hibernate non-active devices by putting them on sleep mode
12. Put the channel in idle direction mode
13. If No then
14. Perform line 7 and goto line 3
15. Else
16. Is the channel free to transmit?
17. If yes
18. Transmit with full UWB channel capacity
19. Else
20. Put the channel to idle sensing mode
21. Successful transmission

11
8. CONCLUSION
This paper discussed a clear framework, implementation procedures and algorithm for designing
an Ultra Wideband medium access control protocol using an asynchronous power saving
techniques. The paper also expresses the importance of using directional antenna system which
can also aid in conserving energy in the design and implementation of MAC protocol in
MANETs. The method is clearly stated with backup from literatures with detailed diagrams and
mathematical expressions. The future work of the research study is to key in the said algorithm in
a supported simulator and to link the physical layer of the protocol with the simulator in order to
produce results that will support the argument. Network Simulator-3 (ns-3) is chosen for the
implementation because of its robustness in terms of supporting different standards and
algorithms.
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