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authorVadim Yanitskiy <vyanitskiy@sysmocom.de>2021-04-09 15:27:59 +0200
committerfixeria <vyanitskiy@sysmocom.de>2021-04-13 22:56:10 +0000
commit84338b5f76c66c0489df12eda4416df7a7c1bbc6 (patch)
treea6cbf859095ef2baf17b6e67030fbd732c270bd1
parented4f7f278342257c27074429aa58c19081da6450 (diff)
TRXD: clarify modulation specific length of Soft-/Hard-bits
-rw-r--r--common/chapters/trx_if.adoc38
1 files changed, 19 insertions, 19 deletions
diff --git a/common/chapters/trx_if.adoc b/common/chapters/trx_if.adoc
index d1aa566..a3a78ab 100644
--- a/common/chapters/trx_if.adoc
+++ b/common/chapters/trx_if.adoc
@@ -477,7 +477,7 @@ value is computed from the training sequence of each burst, where the "ideal"
training sequence is compared to the actual training sequence and the result
expressed in centiBels.
-Soft-bits: 148 bytes for GSM, 444 bytes for EDGE::
+Soft-bits: 148 x N bytes (variable length, N defined by modulation type)::
Contains the uplink burst. Unlike the downlink bursts, the uplink bursts are
designated using the soft-bits notation, so the receiver can indicate its
assurance from 0 to -127 that a given bit is 1, and from 0 to +127 that a given
@@ -525,23 +525,23 @@ also have several synchronization sequences.
.Modulation and TS set number
----
-+-----------------+---------------------------------------+
-| 7 6 5 4 3 2 1 0 | bit numbers (value range) |
-+-----------------+---------------------------------------+
-| . 0 0 X X . . . | GMSK, 4 TS sets (0..3) |
-+-----------------+---------------------------------------+
-| . 0 1 0 X . . . | 8-PSK, 2 TS sets (0..1) |
-+-----------------+---------------------------------------+
-| . 0 1 1 0 . . . | GMSK, Access Burst (see note) |
-+-----------------+---------------------------------------+
-| . 0 1 1 1 . . . | RFU (Reserved for Future Use) |
-+-----------------+---------------------------------------+
-| . 1 0 0 X . . . | 16QAM, 2 TS sets (0..1) |
-+-----------------+---------------------------------------+
-| . 1 0 1 X . . . | 32QAM, 2 TS sets (0..1) |
-+-----------------+---------------------------------------+
-| . 1 1 X X . . . | AQPSK (Downlink), 4 TS sets (0..3) |
-+-----------------+---------------------------------------+
++-----------------+---------------------------------------+--------------+
+| 7 6 5 4 3 2 1 0 | Description | Burst length |
++-----------------+---------------------------------------+--------------+
+| . 0 0 X X . . . | GMSK, 4 TS sets (0..3) | 148 x 1 |
++-----------------+---------------------------------------+--------------+
+| . 0 1 0 X . . . | 8-PSK, 2 TS sets (0..1) | 148 x 3 |
++-----------------+---------------------------------------+--------------+
+| . 0 1 1 0 . . . | GMSK, Access Burst (see note) | 148 x 1 |
++-----------------+---------------------------------------+--------------+
+| . 0 1 1 1 . . . | RFU (Reserved for Future Use) | ------- |
++-----------------+---------------------------------------+--------------+
+| . 1 0 0 X . . . | 16QAM, 2 TS sets (0..1) | 148 x 4 |
++-----------------+---------------------------------------+--------------+
+| . 1 0 1 X . . . | 32QAM, 2 TS sets (0..1) | 148 x 5 |
++-----------------+---------------------------------------+--------------+
+| . 1 1 X X . . . | AQPSK (Downlink), 4 TS sets (0..3) | 148 x 2 |
++-----------------+---------------------------------------+--------------+
----
NOTE: A radio block on PDCH is carried by the sequence of four Normal Bursts.
@@ -591,6 +591,6 @@ Contains the relative (to the full-scale amplitude) transmit power *reduction*
in dB. The absolute value is set on the control interface, so the resulting
power is calculated as follows: `full_scale - (absolute_red + relative_red)`.
-Hard-bits: 148 bytes for GSM, 444 bytes for EDGE::
+Hard-bits: 148 x N bytes (variable length, N defined by modulation type)::
Contains the downlink burst. Each hard-bit (1 or 0) of the burst is represented
using one byte (0x01 or 0x00 respectively).