PCF5083HSLASH5V2SLASHF3 datasheet(54/136 Pages) PHILIPS

54 / 136 page

1996 Oct 29

Philips Semiconductors

Objective speciﬁcation

GSM signal processing IC

PCF5083

9.1.5.4

User data block formats

In the following sections the user data block formats for all

data channels defined in

“GSM Rec. 05.03” are explained.

The formats for uplink and downlink directions are identical

with the exception that three additional bytes are

transmitted in the downlink direction:

• The first byte contains the facch_flag. This flag indicates

whether the channel decoder has decoded a FACCH

(facch_flag = 1) or not (facch_flag = 0).

• The other two bytes, rxqual_ber_low and

rxqual_ber_high, indicate the estimated Bit Error Rate

(BER) at the channel decoder input.

The Bit Error Rate can be calculated using the following

equation:

Tables 44 to 47 show the user data block format for

full-rate and half-rate data channels running at different

baud rates.

Note that the TCH/H4.8 format is used for half-rate data

channels at 4.8 kbits/s. It is equivalent to the format used

for TCH/F9.6 (see Table 46).

BER

rxqual_ber_low

256

rxqual_ber_high

4096

----------------------------------------------------------------------------------------------------------

Table 44 TCH/F2.4

The following table shows the user data block for full rate data channel at 2.4 kbit/s (and less). The 2

× 36 data bits

shown correspond to 2 modified CCITT V.110 36-bit frames.

DESCRIPTION

OFFSET

DOWNLINK DATA

UPLINK DATA

Block size

Valid ﬂag

Modiﬁed CCITT frame 1

rb8 to rb1

rb16 to rb9

rb24 to rb17

rb32 to rb25

rb36 to rb33

Modiﬁed CCITT frame 2

rb8 to rb1

rb16 to rb9

rb24 to rb17

rb32 to rb25

rb36 to rb33

FACCH ﬂag

facch_ﬂag

−

rxqual_ber

rxqual_ber_low

−

rxqual_ber_high

−

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