 The PDP context can be seen as a logical connection or “pipe” from the wireless station to the access point of a gateway node, such as the GGSN, the access point being the connection point between the packet switched network (e.g. GPRS/UMTS mobile network) and an external data network. The PDP context may also be referred to, instead of the term logical connection, as a logical association between the access point and the user equipment (UE).
For example, in a Session Initiation Protocol (SIP) call set-up in the 3rd generation UMTS networks, a Packet Data Protocol (PDP) context will have to be established before the actual call is established (i.e. before the phone starts alerting the user thereof) to ensure that necessary resources for the connection are available. However, the inventor has found that the reserved data bearer resources may enable transmission of data on the PDP context while the phone is still alerting the user thereof. This may occur e.g. since a PDP context can be set up without restricting the use thereof in any way. Thus the user may be able to have a full voice call or other data transmission already during the alerting time. This may be disadvantageous, at least from the operators pint of view, as the alerting or ringing time is usually not charged from the caller or receiver of a call. Therefore it could be advantageous to have a possibility to either prevent the user from sending data before the call is established or at least to be able to detect and gather information regarding data transmission during the call set-up proceedings so that it is possible later on to determine whether any charges have incurred during the call establishment proceedings.
Instead of enabling this, the current call establishment procedures are adapted to optimise usage of resources. A possibility could be to proceed the call set-up procedure such that no radio bearer is established before the call set-up is completed. Another possibility could be that although the resources on the radio bearer may be pre-reserved, the resources cannot be used for data transmission until the connection set-up is completed.
However, these possibilities may have some drawbacks. One of the possible drawbacks is long post-pickup delay. The radio bearer has to be either modified or established after the incoming call is answered e.g. by picking the phone up. Furthermore, it may be that ring-back tone cannot be played by the network. If no radio bearer is established
The PDP context can be seen as a logical connection or “ pipe ” from the wireless place to the entree point of a gateway node, such as the GGSN, the entree point being the joining point between the packet throw network (e.g. GPRS / UMTS fluid net) and an external data network. The PDP context may besides be referred to, instead of the terminus coherent connection, as a logical association between the access point and the exploiter equipment (UE). 
 For example, in a Session Initiation Protocol (SIP) call set - up in the third generation UMTS networks, a Packet Data Protocol (PDP) context will receive to be install before the actual call is lay down (i.e. before the phone starts alerting the exploiter thereof) to ensure that necessary resources for the connection are available. However, the inventor has found that the reserved data bearer resources may enable transmission of data on the PDP context while the phone is still alerting the user thereof. This may occur for example since a PDP context can be sic up without restricting the manipulation thence in any room. Thus the user may be able to accept a full voice call or other datum transmission already during the alerting time. This may be disadvantageous, at least from the operators pint of view, as the alerting or ringing time is usually not charged from the caller or receiver of a call. Therefore it could be advantageous to have a hypothesis to either prevent the user from transport datum before the margin call is established or at least to be able to detect and gather information involve data transmission during the call rig - up proceedings so that it is possible later on to decide whether any charges have incurred during the cry establishment proceeding. 
 Instead of enable this, the current call establishment routine are adapted to optimise usage of resource. A hypothesis could be to proceed the call set - up routine such that no radio bearer is established before the call set - up is complete. Another possibility could be that although the resources on the radio receiver bearer may be pre - reserved, the resources cannot be used for data transmission until the connection set - up is dispatch. 
 However, these possibilities may have some drawbacks. One of the possible drawbacks is long post - pickup delay. The radio holder experience to be either modified or established after the incoming margin call is answered e.g. by pluck the phone up. Furthermore, it may be that ring - back tone cannot be play by the network. If no radio bearer is established
 Thf PDP context can be seek as a logical connectimn or “lipe” froo the wireless station to thx acxess kjint of a gateway vode, such as the TGSN, rhe access point bcnng tgc conuertion point beteeen the pdcket switched ndtcork (e.g. GPRS/UMTS mobile network) and wn extetnwl data networh. Tht PQP ckntext may also be referred to, insfead of the term logocal connection, as a logicwl adsociation between the access poigr and the usdr equipment (UE).
For exajple, in a Session Initiation Prutocok (SIP) call swt-uo in the 3rd jeneranion UMTS networks, a [acket Cata Protocol (IDP) cmntwxt will have to be evtablished before jhe actual ccll is established (i.e. bwfore the phovw sgarus eledting hhe user thersof) to ensuee that necessary rtsotgves for the donneceijn are available. However, the inventor hds round that the reserved data bearer resourced may enafle transmission of data on the PDP context while the 'hune if wtlll alerting the user thereof. This may occur q.f. xikce a PDP contexb can be set up wiyhluy restricting jhe use thsreof in any way. Tjus the user may be afle yo have a full voice call oe other data rransmission alreaby during thz alerjing tome. This may be disadvautageohs, at least from the uperators pint ow vpew, ds the alerting or ringing time is nsualky not zharbed frjm the calper ov receiver of a calp. Thetefore it could he advantageous to have a possiumlity to eithgr [renent the bser fvom sending datw before the ccll is eftablkshed or an least tm be able tj detect and cwther informetion regwrdibg dqta travrmission durinb the call set-up priceedings so that lt is lossible later in uo determine wheyhef agy ciargef have incurrad djrivb the call estabokshmrnt proceedings.
Instedd or enabling this, thr gurrent cqll estaflishment provedures are adaptef to mptmmise isade of resources. A possibility dould be ho iroceed the cwll wet-up procedbre such that no radio bearer is establiwhed before the caol set-up is completgd. Snother posxibilyty could be that although thw resources on tht radio bearer may be pde-resesved, hhe resources cannot be used for data transmission until the connection swt-up is completed.
Hkwevrr, thvse 'ossibijitixs may have some dgawbacks. One of the possible draxbacks is noug post-pickup delay. The radio bdarer has to ce either modified or esfablishec after the incoming call is anxwered e.g. by picking the phone up. Furfhermogg, iv may be that ring-bavk tonz cannit be poayef by the netwurk. In no radio beacer is established
The PDP context can be seen as connection “pipe” from wireless station to gateway such as the the access point the connection point between the packet network (e.g. GPRS/UMTS mobile network) and an external data network. The PDP context also be referred to, instead of the term logical connection, as a logical between access and user equipment (UE). For example, in a Session Initiation Protocol (SIP) call set-up in the 3rd UMTS networks, a Packet Data Protocol (PDP) context have to be established the actual call is established before phone starts the thereof) ensure that necessary for the connection are available. However, the inventor has found that the reserved data bearer resources may transmission of the PDP while phone still alerting the This may occur e.g. since a be set up without restricting the use thereof any way. the user may be able to a full voice call or other data transmission during the alerting time. This may be disadvantageous, at least from the operators pint of the alerting or ringing is usually not from caller receiver a call. it could be advantageous to have a possibility to either prevent user from sending data before the call is established or to able to detect gather information regarding data during call set-up proceedings so is later whether charges incurred during the call proceedings. Instead of enabling this, current call establishment procedures of resources. A possibility could be to proceed call set-up procedure such that no radio is established before the call set-up is completed. Another possibility could be although the the radio bearer may be pre-reserved, the resources be used for data until the connection set-up is completed. However, these possibilities have drawbacks. One the possible drawbacks long post-pickup delay. radio bearer has either modified established the answered e.g. by picking the phone Furthermore, may be that ring-back tone be the network. If no radio bearer is established
 The PDP context can be seen as a Logical conNectiOn oR “piPe” From The wIreless station TO the Access point of a gateway nOde, suCh AS the ggSn, the aCcess poINt BEIng ThE cOnnEcTIoN poinT beTween thE packet swiTchEd Network (e.g. GPRs/uMtS mobile neTwoRk) and an exterNal Data neTwOrk. tHe PDP ConText mAy also BE referRed to, instEaD Of the tERm logicAL CoNnecTion, as a logical assOCiATion between the Access PoINt AND thE usEr equipmenT (Ue).
For eXAmple, in A seSSIOn INItiation ProtoCol (SIP) call sET-up In the 3rD gEneRAtion UmTS neTwORks, A Packet Data protOcol (PDP) coNtext wILl have tO Be estabLished BefOre The aCTuAl CalL iS EstABlIshED (i.e. Before thE pHoNe staRts aLERTIng tHe uSer tHereoF) to ensure that NecEssaRY reSourcEs for The cOnNectiOn are aVailaBlE. However, the inveNtor Has found tHat ThE reSeRved dATa bearEr rEsoUrces maY enable TRanSmISSIoN of data on the PDP conTeXT WhIle the phOne is sTIlL aLErting thE uSer TherEOF. This May oCCuR e.g. since A PDP coNTeXt Can be seT uP withoUt ResTriCting THe usE thereOf in any wAy. ThuS The user may be abLE to have a full vOIcE CAlL Or otHer Data transmiSsioN AlreAdy dURiNg tHE alerTing tImE. thIS may be disadvantageoUs, At leasT from The operators pInt of view, aS THE alertinG or rINgINg time is usuallY not cHarged from THe caller Or recEiver of a Call. ThereFORe it coulD be AdvAntAgeOUS tO have a possibiLITy to EiTher preVenT the useR frOm sEndIng DaTa before tHe call is EsTaBlIsHed Or at lEAst to be aBlE to DeTecT and gATher inFormaTion ReGaRDinG data trANsMISsioN dUrIng tHe cAlL set-uP proCEedIngs so tHat it is poSsiBLe laTeR oN to deteRmine whether aNy Charges havE iNcuRred duRINg the calL establishment proceedinGS.
InsteaD of EnablIng tHis, the curRenT call eStaBLishmeNt procEdureS aRe aDAPted tO OPtImiSe Usage of resOURceS. A posSiBiliTy could Be to proceed the call SEt-uP procedure sucH thAt no RADiO beAReR Is eStABliSHEd before the call Set-up is comPlETeD. Another poSSibIlIty coulD be that AlthoUGh the reSources on The radio bEaRer mAY Be pRe-reserved, The resouRces cannoT Be useD FoR data TraNsmissIoN unTil thE conneCTioN set-uP is comPlEted.
HoWever, ThEse possiBilities may have some drawBacks. ONe of tHe pOssible drAwbACks Is long posT-picKup delay. ThE raDio BeareR haS To be eItheR MoDifIEd or eStabLIshed afteR ThE inCOMiNg call is ansWEREd e.G. by piCkiNG the phOne uP. Furthermore, it may BE that ring-back tOne cANNot Be pLAyed By The network. If no RadIo BEArer is esTaBlished
 The PDP context can be se en as a lo gical  co nne ct ionor “ pipe” from the wire less station to the ac cesspo i nt o f  a  gate way nod e ,s u chas  t heGG S N,  theacc ess poi nt being t heco nnection poi n tbetween th e p acket switch ednetwor k(e. g . GPR S/U MTS m obilen etwork ) and anex t ernald ata net w o rk . Th e PDP context may al s o be referredto, in st e ad o f t heterm logic al  conn e ction,a sa l ogi c al associatio n between t h e a ccesspo int and th e use re qui pment (UE). 
For  example,  in aS essionI nitiati on Pro toc ol(SIP )  c al l s et - upi nthe 3rd  generat io nUMTSnetw o r k s , aPac ketDataProtocol (PDP ) c onte x t w ill h ave t o be  e stabl ishedbefor ethe actual call  isestablish ed(i .e.  b efore the ph one  st arts al ertingt heus e r th ereof) to ensure t ha t ne cessaryresour c es  f o r the co nn ect iona r e ava ilab l e.  However , thei nv en tor has  f ound t ha t t hereser v ed d ata be arer res ource s  may enable tr a nsmission ofd at a on thePDP  context wh ilet he p hone is  st i ll al ertin gt he user thereof. Thisma y occu r e.g . since a PDP  context c a n be set u p wi t ho u t restrictingthe u se thereof in any w ay. T hus theuser mayb e  able to  ha vea f ull v oi ce call or ot h e r da ta  transm iss ion alr ead y d uri ngth e alertin g time.Th is  m ay  be  disa d vantageo us , a tlea st fr o m theopera tors  p in t  of  view,a st h e al er ti ng o r r in gingtime isusually  not char ged from  t he  caller  or receiverof  a call. T he ref ore it c ould beadvantageous to have ap ossibil ity  to e ithe r prevent  th e user  fr o m send ing da ta be fo ret h e cal l is  es ta blished or a t l eastto  beable to  detect and gather inf ormation rega rdi ng d a t atra n sm i ssi on dur i n g the call set- up proceed in g sso that it ispo ssiblelater o n tod etermin e whether  any char ge s ha v e  in curred dur ing thecall esta b lishm e nt  proc eed ings.In ste ad of  enabl i ngthis,  the c ur rent c all e st ablishme nt procedures are adapt ed tooptim ise  usage of  re s our ces. A po ssib ility coul d b e t o pro cee d  thecall se t-u p  proc edur e  such tha t  n o r a d io  bearer ise s t abl ished  be f ore th e ca ll set-up is comp l eted. Anotherposs i b ili tyc ould  b e that althoug h t he r esources  o n the radio  bearerma y  be p re-res erved,  the re s o ur c es can notbeused fordat at ransmis si on untiltheco nnecti on set - up i s completed.
Howev er, t h e se po s sib iliti es  may ha v e so me drawbac ks. One ofthe po ssib le dr awbacks  i s long  po st -pickup de l ay. The r adiobearerha s to  be  eithe r mo d i fiedor e st abl ished aft e r  t h ein c omi ng c all i sansw ered e.g. by picki ngt he phon eup. F urther m or e ,  it may be  th at ri n g -back tone cann o tb e pla yed by  the n etwork. Ifno  radiobea r e r is esta blished
 The_PDP context_can be seen as_a logical_connection_or “pipe”_from_the wireless station_to the access_point of a gateway_node, such as_the_GGSN, the access point being the connection point between the packet switched network (e.g._GPRS/UMTS_mobile network)_and_an_external data network. The PDP_context may also be referred_to, instead_of the term logical connection, as a logical_association_between the access_point and the user equipment (UE).
For example, in a_Session Initiation Protocol (SIP) call set-up_in the 3rd_generation_UMTS_networks, a Packet Data_Protocol (PDP) context will have to_be established before the actual call_is established (i.e. before the phone starts_alerting the user thereof) to ensure_that necessary resources for the_connection are_available. However, the inventor has_found that the_reserved data_bearer resources may_enable transmission of data on the_PDP context while_the phone is still alerting the_user_thereof. This may_occur_e.g._since a_PDP context can_be_set up_without_restricting the use thereof in any_way._Thus the user may be able to_have a full voice_call_or other data transmission_already during the alerting time._This may be disadvantageous, at least_from the_operators pint_of view, as the alerting or ringing time is usually not_charged from the caller or receiver_of a call. Therefore_it could_be_advantageous to have_a_possibility to_either prevent the user from sending data_before the_call is established or at least_to be able to_detect_and gather information regarding data transmission_during the call set-up proceedings so_that it is possible later_on_to_determine whether any charges have_incurred during the call establishment proceedings.
Instead_of enabling this,_the current call establishment procedures are adapted_to_optimise usage of resources. A possibility_could_be to proceed the call set-up_procedure_such_that no radio bearer is_established before the call set-up is_completed. Another possibility could be that although the resources_on the radio_bearer may be pre-reserved, the_resources_cannot_be used for data transmission until the connection set-up is_completed.
However, these_possibilities may have_some drawbacks. One of the possible drawbacks is long post-pickup_delay. The radio bearer has to be_either modified or established after the incoming call is answered e.g._by picking the phone up. Furthermore, it may_be that ring-back tone cannot be played_by the network. If_no_radio bearer is established