LTE PCFICH - Physical Control Format Indicator Channel

PCFICH- Physical Control Format Indicator Channel 

 

• The Physical Control Format Indicator Channel (PCFICH) is used at the start of each one ms downlink subframe to signal the number of symbols used for the PDCCH

• The PCFICH is broadcast on the same set of antenna ports as a result of the PBCH. this implies that it area unit usually broadcast mistreatment solely antenna port zero, or transmit diversity area unit usually accustomed broadcast the PCFICH mistreatment antenna ports.

• The PCFICH occupies sixteen Resource components at intervals the first OFDMA image of each one ms downlink subframe. These sixteen Resource components area unit divided into four quadruplets. The position of these four quadruplets at intervals the first OFDMA image depends upon the downlink channel information measure and thus the Physical layer Cell Identity (PCI). associate degree example PCFICH allocation is illustrated in Figure ninety-four
• The PCFICH uses QPSK modulation thus the sixteen Resource components enable thirty-two bits
• The PCFICH transfers a bearing Format Indicator (CFI) that options a worth ranging from one to 3
• actual price = signaled price + one for the one.4 megacycle per second channel information measure actual price = signaled price for alternative channel bandwidths
• The CFI is channel coded to thirty-two bits to occupy the whole PCFICH capability
• The 1.4 megacycle per second channel information measure needs associate degree magnified variety of symbols at intervals the time domain as a result of there area unit fewer subcarriers at intervals the frequency domain, i.e. associate degree magnified variety of symbols at intervals the time domain is needed to require care of a cheap PDCCH capability
• The signaled price is determined by the linear unit lyric B radio resource management and depends upon the number of active connections, i.e. PDCCH communication will increase as a result of the number of active connections will increase
• The PCFICH represents associate degree overhead that reduces the number of Resource components out there for user plane information oo
• overhead decreases for larger channel bandwidths overhead will increase once mistreatment the extended cyclic prefix

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