What is compressed mode?Higher layers can request a UE to monitor cells on other frequencies (FDD, TDD), or other systems (!")# This implies that the UE has to perform measurements, on the other frequencies$systems and thus higher layers command the UE###!ee more21) What is CCTrCH? A Coded Composite Transport Channel is the result of combining (multiplexing) severalTransport Channels of the same tpe! i"e"# $e can have a CCTrCh madeup of one orseveral %CHs& a CCTrCh made up of %'CHs" (ne exception is that $e can have one orseveral )ACHs multiplexed $ith a *CH on the same CCTrCh" A better notation $ould befor example#CCTrCh+%CH# A CCTrCh consisting of + %CHsCCTrCh,)ACH# A CCTrCh consisting of , )ACHsCCTrCh*CH&2)ACH# A CCTrCh consisting of the *CH and 2 )ACHs22) What is compressed mode?Higher laers can re-uest a ./ to monitor cells on other fre-uencies ()%%& T%%)& or othersstems (0'1)" This implies that the ./ has to perform measurements& on the otherfre-uencies2sstems and thus higher laers command the ./ to enter Compressed 1ode"The .T3A4 need to send to the ./ all the parameters for the Compressed1ode"Compression Methods:When in Compressed 1ode the information normall transmitted during a 15 ms frame iscompressed in time sothat gaps of ade-uate length are created" To achieve this one ofthree mechanisms6PuncturingThis method is 4(T applicable to do$nlin7"6Spread Factor ReductionActuall halving the 'pread )actor" 'o $ith this method if ') is used in non8compressedframes then ')22 is used in the compressed frames"6Higher Layer Scheduling Higher 9aers set restrictions so that onl a subset of allo$ed T)Cs are used inCompressed 1ode"Compressed Mode Parameter: TGSN(Transmission 0ap 'tarting 'lot 4umber)# A transmission gap pattern begins in aradio frame&called :rstradio frame of the transmission gap pattern& containing at least onetransmission gap slot" T0'4 is the slot numberof the :rst transmission gap slot $ithin the:rst radio frame of the transmission gap pattern!TGL1(Transmission 0ap 9ength 1)# %uration of the :rst transmission gap $ithin thetransmission gap pattern& expressed in number of slots! TGL(Transmission 0ap 9ength 2)# %uration of the second transmission gap $ithin thetransmission gap pattern& expressed in number of slots" ;f this parameter is not explicitl setb higher laers& then T092