Change in osmo-gsm-manuals[master]: TRXD: use different coding for AQPSK in the 'MTC' field

This is merely a historical archive of years 2008-2021, before the migration to mailman3.

A maintained and still updated list archive can be found at https://lists.osmocom.org/hyperkitty/list/gerrit-log@lists.osmocom.org/.

fixeria gerrit-no-reply at lists.osmocom.org
Mon Feb 1 19:58:57 UTC 2021


fixeria has uploaded this change for review. ( https://gerrit.osmocom.org/c/osmo-gsm-manuals/+/22616 )


Change subject: TRXD: use different coding for AQPSK in the 'MTC' field
......................................................................

TRXD: use different coding for AQPSK in the 'MTC' field

AQPSK is used exclusively on Downlink in VAMOS mode.  An AQPSK burst
is basically a combination of two Normal Bursts.  Each of these two
bursts has the same length as defined for GMSK, while both must be
using Training Sequences from different sets.

Four different sets are defined in 3GPP 45.002, section 5.2.3.1.
Therefore we need *two* bits to encode all possible values.  Let's
rearrange the existing combinations and use '11XX'B for AQPSK.  The
old combination '011X'B becomes reserved and can be re-purposed.

This change is considered to be safe, given that no implementations
are known to support AQPSK at the moment of making this change.

Change-Id: Ie9b419e4a70fa0eb2888c326ac50d2d40a67a29c
Related: SYS#4895, OS#4941, OS#4006
---
M common/chapters/trx_if.adoc
1 file changed, 2 insertions(+), 2 deletions(-)



  git pull ssh://gerrit.osmocom.org:29418/osmo-gsm-manuals refs/changes/16/22616/1

diff --git a/common/chapters/trx_if.adoc b/common/chapters/trx_if.adoc
index cf2687d..8bc510e 100644
--- a/common/chapters/trx_if.adoc
+++ b/common/chapters/trx_if.adoc
@@ -470,13 +470,13 @@
 +-----------------+---------------------------------------+
 | . 0 1 0 X . . . | 8-PSK, 2 TS sets (0..1)               |
 +-----------------+---------------------------------------+
-| . 0 1 1 X . . . | AQPSK, 2 TS sets (0..1)               |
+| . 0 1 1 X . . . | 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 . . . | RESERVED (0)                          |
+| . 1 1 X X . . . | AQPSK (Downlink), 4 TS sets (0..3)    |
 +-----------------+---------------------------------------+
 ----
 

-- 
To view, visit https://gerrit.osmocom.org/c/osmo-gsm-manuals/+/22616
To unsubscribe, or for help writing mail filters, visit https://gerrit.osmocom.org/settings

Gerrit-Project: osmo-gsm-manuals
Gerrit-Branch: master
Gerrit-Change-Id: Ie9b419e4a70fa0eb2888c326ac50d2d40a67a29c
Gerrit-Change-Number: 22616
Gerrit-PatchSet: 1
Gerrit-Owner: fixeria <vyanitskiy at sysmocom.de>
Gerrit-MessageType: newchange
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osmocom.org/pipermail/gerrit-log/attachments/20210201/38f1b5fc/attachment.htm>


More information about the gerrit-log mailing list