18 Aug
2017
18 Aug
'17
8:09 p.m.
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http://cgit.osmocom.org/osmo-pcu/commit/?id=1f189093358fd87b11cd2e83a43b719…
commit 1f189093358fd87b11cd2e83a43b719fc6858e3e
Author: Minh-Quang Nguyen <minh-quang.nguyen(a)nutaq.com>
Date: Wed Aug 16 09:50:06 2017 -0400
EDGE: Fix UL link adaptation.
We have seen that UL MCS5- MCS9 link adaptation has not been implemented in current
PCU implementation.
If the MS slowly moves far away from the BTS, the UL MCS will always stick at MCS9 no
matter UL link quality values leading to poor data service experience.
The UL MCS is expected to adapt from MCS9 -> MCSx due to bad UL quality.
Below PCU traces indicate that UL MCS is quickly increasing to MCS9 (max MCS 9 was
used in this test) and it never changes to other UL MCS due zero thresholds.
<0004> gprs_ms.cpp:670 MS (IMSI ): Link quality 23dB (23dB) left window [0, 0],
modifying uplink CS level: MCS-6 -> MCS-7
<0004> gprs_ms.cpp:670 MS (IMSI 000): Link quality 23dB (23dB) left window [0,
0], modifying uplink CS level: MCS-7 -> MCS-8
<0004> gprs_ms.cpp:670 MS (IMSI 000): Link quality 23dB (23dB) left window [0,
0], modifying uplink CS level: MCS-8 -> MCS-9
Change-Id: I9272c337ad6399da4a47cc6e2736e25f24e099d8
-----------------------------------------------------------------------
Summary of changes:
src/bts.h | 1 +
src/gprs_ms.cpp | 9 ++++---
src/pcu_main.cpp | 22 +++++++++++++++++
src/pcu_vty.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 100 insertions(+), 5 deletions(-)
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UNNAMED PROJECT