Biomedical Engineering Reference
In-Depth Information
Table 7.1
Different.Radio.Transmission.Technologies.Proposed.by.Various.Organizations
Organization
ProposalofRadioTransmissionTechnology
European.Telecommunications.Standards.
Institute.(ETSI).in.Europe
WCDMA-frequency.division.duplex.
(WCDMA-FDD)
WCDMA-time.division.duplex.(WCDMA-TDD)
Digital.enhanced.cordless.telephone.(DECT)
Association.of.Radio.Industries.and.
Businesses.(ARIB).in.Japan
WCDMA-FDD
Telecommunications.Industry.Association.
(TIA).in.the.United.States
Universal.Wireless.Communications.
136 (UWC-136)
cdma2000
Wireless.multimedia.and.messaging.services.
WCDMA.(WIMS.WCDMA)
T1P1.in.the.United.States
WCDMA-North.America.(WCDMA-NA)
Telecommunications.Technology.Association.
(TTA).in.Korea
WCDMA
cdma2000
China.Academy.of.Telecommunications.
Technologies.(CATT).in.China
Time.division.synchronous.CDMA.
(TD-SCDMA)
the.QoS.of.the.user.is.then.satisfied,.and.hence.good.service.with.guaranteed.
quality.is.available.
On. the. other. hand,. service. operators. want. to. optimize. their. revenues.
by. maximizing. the. total. number. of. users. utilizing. their. networks. (i.e.,.
the. total. capacity).. The. maximum. capacity. of. a. network. depends. on. the.
requested. service. and. the. / 0
E b . value. of. each. user.. Consider. an. extreme.
case.for.which.all.users.only.use.the.voice.service;.a.large.capacity.can.be.
obtained.as.voice.service.demands.fewer.resources.compared.to.video.ser-
vice..Nevertheless,.this.is.unlikely.to.happen.because.users.usually.ask.for.
different.services.
In.general,.network.users.request.voice,.data,.and.video.services.simultane-
ously..If.each.user.enjoys.the.requested.service.with.
E
N
b >> γ ,.more.resources.
are.consumed,.and.the.maximum.capacity.will.decrease.
To. fulill. the. desires. of. both. service. operators. and. users. better,. resource.
management.is.indeed.important.from.a.system.design.point.of.view..The.
objective.is.to.allocate.the.resources.optimally.so.that.the.radio.spectrum.can.
be.efficiently.utilized;.the.QoS.of.each.connecting.user.can.be.satisfied,.and.
the.network.capacity.is.maximized.[5,26-28].
The.network.maximum.capacity.depends.on.the. / 0
0
E b .value.of.each.user,.
which.in.turn.is.related.to.the.resources,.including.transmission.power.and.
transmission.rate..As.a.result,.resource.management.in.transmission.power.
and.rate.control.is.required.
 
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