Preemption

7/26/2019 Preemption

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A method for assigning priorities of services to users in a communication network.

In the exemplary embodiment of the invention described herein, the priority of services requested by

the users such as mobile users, is assigned according to an Allocation Retention Priority ARP!

Information "lement I"! as defined in #$.%&$ '(PP ("RA) *echnical +pecification. *he

arrangement described herein allows managing radio resource congestion without any long and

complex connection reconfigurations from the Radio Resource anager point of view.

In a preferred embodiment of the invention the Allocation Retention Priority ARP! Information

"lement I"! includes information items such as-

a Preemption /apability Indicator P/I!, indicative of whether the corresponding service may or

may not trigger preemption0

a Preemption 1ulnerability Indicator P1I!, indicative of whether the corresponding service may be

preempted or shall not be preempted0 and

a priority level assigned to the service

A method of assigning priorities of service to users in a communication network, the method

including the step of assigning said priorities on the basis of an Allocation Retention Priority

(ARP) Information Element (IE)

!he method of claim ", characterised in thatit includes the step of including in said

Allocation Retention Priority (ARP) Information Element (IE) information items selected out

of the group consisting of#

$ a Pre$emption %apability Indicator (P%I), indicative of whether the corresponding service

may or may not trigger pre$emption&

$ a Pre$emption 'ulnerability Indicator (P'I), indicative of whether the corresponding

service may be pre$empted or shall not be pre$empted& and

$ a priority level assigned to said service

!he method of either of claims " or ,

characterised in thatit includes the steps of#

$ including in said Allocation Retention Priority (ARP) Information Element (IE) an

information item indicative of a priority level assigned to the corresponding service&

$ transferring to services having a given priority level in said Allocation Retention Priority

Information Element (ARP$IE) communication resources taken from services indicated by

said Pre$emption 'ulnerability Indicator (P'I) as services that may be pre$empted and

having a priority level lower than said given priority level

!he method of claim , characterised in thatit includes the steps of

$ detecting a congestion situation in said network, and

$ transferring, in the presence of said congestion situation, said transmission resources to said

services having a given priority level in said Allocation Retention Priority Information

Element (ARP$IE)


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!he method of claim *, characterised in thatsaid step of transferring is performed only

as long as said congestion situation e+ists

!he method of any of the previous claims, characterised in thatit includes the step of

assigning to said services communication channel resources (P%-) in said network on the

basis of#

$ a resource Allocation Algorithm responsible for channel resource (P%-) assignment to aterminal re.uesting the service, and

$ scheduling assignment of the channel resource to the service

!he method of claims * and /, characterised in thatit includes the step of detecting said

congestion situation as absent when the overall allocated capacity on the channel resource

(P%-) is less than or, e.ual to, the ma+imum channel resource (P%-) capacity per unit of

time

!he method of any of the previous claims, characterised in thatproviding said services

to the users of the network involves establishing a logical connection between a user terminal

(01) re.uesting service and a 2ase 1tation 1ystem (211) providing services, said logicalconnection being in the form of at least one !emporary 2lock 3low (!23& !23 ", !23 ) to

support transfer of data

!he method of claim 4, characterised in thatit includes the step of maintaining said

!emporary 2lock 3low (!23, !23 ", !23 ) only for the duration of said transfer of data

!he method of either of claims 4 or 5, characterised in thatit includes the step of

establishing more than one !emporary 2lock 3low (!23 ", !23 ) according to a multiple

!23 (m!23) scheme

A system for assigning priorities of service to users in a communication network, the

system being configured for assigning said priorities on the basis of the method of any of

claims " to "6

A computer program product, directly loadable in the memory of at least one computer

and including software code portions for performing the method of any of claims " to "6

EZCSGSN1 maphotl@eqm01s14p2 ANCB ~ # gsh get_qos

Parameter Act!e "ata Plae$ "ata

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

tmestamp 201&0'100244&& _

plaState _ _

g(g )*oSG+aratee$BtrateG, -00 _

g(. )*oSG+aratee$Btrate/, 204 _

g(ga )*oSG+aratee$BtrateGAct+al, -00 _


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g(.a )*oSG+aratee$Btrate/Act+al, 204 _

pe )*oSPolcgEa(le, tr+e _

co )Co!ersatoal"Ser!appg, E3 _

st )Streamg"Ser!appg, A321 _

1 )5teract!e1"Ser!appg, A311 _

2 )5teract!e2"Ser!appg, BE _

- )5teract!e-"Ser!appg, BE _

(g )Bac6gro+$"Ser!appg, BE _

gosq )G7!err$eS+(scr(e$*os, o _

smah )Se$(cAt8ss*oso$, o _

smam )Se$(cAt5rato(lt9, o _

smas )Se$(cAto(lt93orSgs, o _

cqm )*oSC+stom:e$*osappg, sta$ar$ _

$g! )*oS5p"scpGtpC;al+e, 0 _

If the

GnOverrideSubscribedQos parameter is active then subscription data QoS is

not checked at this stage. The received QoS from GGSN is the new negotiated

QoS, also called authorized QoS.

7uality of 1ervice (7o1) in cellular networks is defined as the capability of the

cellular service providers to provide a satisfactory service which includes voice.uality, signal strength, low call blocking and dropping probability, high data rates

for multimedia and data applications etc 3or network based services 7o1 dependson the following factors 89ain 6/ :
http://www.cse.wustl.edu/~jain/cse574-06/ftp/cellular_qos/#Jain%2006http://www.cse.wustl.edu/~jain/cse574-06/ftp/cellular_qos/#Jain%2006


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Throughput!he rate at which the packets go through the network

0a+imum rate is always preferred

Delay!his is the time which a packet takes to travel from one end to the

other 0inimum delay is always preferred

Packet Loss Rate!he rate at which a packet is lost !his should also be as

minimum as possible

Packet Error Rate!his is the errors which are present in a packet due to

corrupted bits !his should be as minimum as possible

Reliability!he availability of a connection (;inks going ups worldand to support it 7o1 has to be given ma+imum priority It is important todifferentiate the traffic based on priority level 1ome traffic classes should be given

higher priority over other classes, E+ample# voice should be given a higher prioritycompared to data traffic as voice is still considered as the most important service It

should be noted that more preference has to be given to customers who pay moreto get better service, without affecting the remaining customers who pay normal

amount !o reali?e all these things effective 7o1 schemes are needed Issues andschemes related to providing better 7o1 is the main sub=ect of this report

1. Quality o! Ser"ice #hallenges

In wireless mobile networks 7o1 refers to the measurement of a system with goodtransmission .uality, service availability and minimum delay In @ it is e+pected

to have a reliability of at least 55555 referred to as five nine reliability !he ma=orchallenges when considering 7o1 in cellular networks are varying rate channel

characteristics, bandwidth allocation, fault tolerance levels and handoff supportamong heterogeneous wireless networks It is fortunate that each layer which

includes physical, 0A%, IP, !%P and application have got their own mechanisms

to provide 7o1 It is important to guarantee 7o1 in each layer so that the networkis more fle+ible and tolerant to 7o1 issues 1ome of the other challenges are


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efficient usage of the spectrum as its availability is limited 2andwidth allocationplays a ma=or role with respect to this aspect It must be made sure that bandwidth

is allocated in an efficient manner and also the remaining bandwidth should not bewasted 1ome schemes like Renegotiation scheme 80onego 6*: takes care of this

issue by allocating the remaining bandwidth to lower priority classes !hings geteven more complicated when data and voice service has to be supported 'oice

services are very delay sensitive and re.uire real $ time service Bn the other handdata services are less delay sensitive but are very sensitive to loss of data and also

they e+pect error free packets 1o both these factors have to be considered forproviding 7o1 for voice and data services

1.$ What has been achie"ed so !ar in QoS

In " networks and networks such as 10 and %0A there was only one

aspect of 7o1 and it is voice Providing .uality speech was the ma=or concernCow in networks 7o1 has to be provided for voice as well as data 1till priorityis given for voice services as they are considered as the primary service !hey are

very delay sensitive and re.uire real $ time service ata services are comprised ofte+t and multimedia !hese services are less delay sensitive but e+pect better

throughput and less or no loss rate

!he rest of this paper is organi?ed as follows 1ection talks about the Dniversal

0obile !elecommunication 1ystem (D0!1) 7o1 architecture and every layer inthe architecture is described with their functionalities In 1ection we deal with

different classes of 7o1 and also the various attributes which specify the i7o11ection @ deals with the various 7o1 schemes in cellular networks such as 3ault

!olerant ynamic %hannel Allocation, %all Admission %ontrol (%A%) algorithm,7o1 provisioning using mobile prediction techni.ues to improve hand over loss

probability, ynamic channel allocation using Renegotiation techni.ues and i7o1which is an important aspect of 7o1 from user>s point of view 1ection * discusses

about the coupling of ;AC and cellular networks so that the high data rate of the;AC and the high mobility of the cellular networks is utili?ed !wo different

architectures loosely coupled approach and tightly coupled approach are

considered and e+plained 3inally 1ection / summari?es the whole report ;ist ofAcronyms and References are given towards the end

2ack to !able of %ontents
http://www.cse.wustl.edu/~jain/cse574-06/ftp/cellular_qos/#Monego%2005http://www.cse.wustl.edu/~jain/cse574-06/ftp/cellular_qos/#tochttp://www.cse.wustl.edu/~jain/cse574-06/ftp/cellular_qos/#Monego%2005http://www.cse.wustl.edu/~jain/cse574-06/ftp/cellular_qos/#toc

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