why CCE index allowed values between 0-88 only as per FAPI document?

Question

Is it not possible more than 89 CCE's in any bandwidth?

Answer 1

Hi sripathi,

take example 20MHZ BW FDD and CFI = MAX .i.e 3 , PHICH normal and NG = MIN i.e 1/6 . so there are 3600 R.E's in 20mhz 3 symbol PDCCH,

1 CCE = 36 R.E , so there are 3600/36 = 100 CCE, But first symbole will be occupied by reference signal , PHICH and PCFICH. in CELL ID 0.so only MAX of 87 CCE is possible out of 100 CCE . that is the reason FAPI have said only 0 - 88 is possible.

Comments

Hi jaganathan, Thanks for your explanation. As per your calculation max 87CCEs so value should be 0 to 86 . But why 0 to 88????

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Hi sripathi,

I don't know, May be with other cell ID this size may vary upto 88 (My guess), because other cell ID will have different reference signal and PHICH and PCFICH.

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ok thank you jaganathan ...