The problem is that when using those RBs with MCS 28 we may exceed the
code rate 0.93 and according to 36.213 7.1.7 the UE may skip decoding
PDSCH entirely in this case.
This is a hack. The real solution is to check that the code rate is below
0.93 for each scheduling decision and, I don't know, reduce the MCS if the
code rate is above, so that in the end it is below. That means that we need
a proper resource grid for the configuration of the eNB and this is not an
easy thing (at least from my point of view) given all the possible
configurations for the eNB, so I prefer not to do it rather than do something
incorrect, thus this hack.
The problem of this hack is that we won't use all the available RBs for
scheduling, potentially reducing the maximum throughput achievable.
To be fixed properly at some time, by someone who understands fully the
resource grid and all the possible combinations (fdd/tdd, number of
antennas, whatever else).
RLC has timers. We need to keep track of time. We chose to not use
realtime but 'processing time'. That is we send a tick to RLC for every
subframe when it is processed by the softmodem. Before this commit we
used to increase time in the function mac_rlc_status_ind which may not be
called every subframe (especially in TDD mode). So we need another way
to keep track of time.
We introduce rlc_tick() and call it in eNB_dlsch_ulsch_scheduler, which
is called every subframe, both in FDD and TDD.
We also call rlc_tick() in the function ru_thread_synch() because
pdcp_run() and rrc_rx_tx() are called there too.
It may not be the best solution. To be revised if needed.
Note: the UE has not been touched. Some modification is needed for the UE
too, most probably.
- MBMS scheduler re-worked to enable dedicated MBMS serving cells
- added support for multiple eMBMS MCH sessions
- added support for multiple FeMBMS MCH sessions
Signed-off-by: Javier Morgade <javier.morgade@ieee.org>
UE_list_t is now used as a separate list. It can be e.g. used in the
scheduler to mark groups of users. The original UE_list_t is renamed to
UE_info_t to reflect that it is a container for information about UEs.
When a header is changed, all including files need to be recompiled,
too. Thus, including a header needlessly all over the place drives
compile times up without any reason.
The timer code used to trigger periodic statistics message sending used
ITTI. Together with a high frequency reporting (e.g. 1ms), this resulted
in high CPU usage. This commit reimplements this:
* using a thread that is synchronized to the RU (if there is no MAC, we
assume there is no RU generating a tick so we create the tick source
ourselves)
* no RB trees but plain arrays
* smaller interface for users
* slight user interface changes
* remove stopped timer state: such timer might be simply removed
* remove one-shot timers
M3AP ASN1 source spec updated
ACKNOWLEDGEMENT:
1. This commit was developed at Vicomtech (https://www.vicomtech.org) under UE project CDN-X-ALL: "CDN edge-cloud computing for efficient cache and reliable streaming aCROSS Aggregated unicast-multicast LinkS"
2. Project funded by Fed4FIRE+ OC5 (https://www.fed4fire.eu)
Signed-off-by: Javier Morgade <javier.morgade@ieee.org>
-MBMS scheduler developed (oneFrame allocations implemented at this time)
-UE DSLCH schedulers updated: if an eMBMS session running UE DTCH, DCCH will be only scheduled at non MBSFN sufbframes
-eMBMS L2 procedures implemented
-Dedicated MBMS PDCP pipes src/sink enabled (only for TUN)
-BUGFIX eMBMS MAC procedures (wrong indexing at few loops)
-ENB FAPI updated to enable dynamic MBSFN configurations through M2AP (RRC<->MCE)
ACKNOWLEDGEMENT:
1. This commit was developed at Vicomtech (https://www.vicomtech.org) under UE project CDN-X-ALL: "CDN edge-cloud computing for efficient cache and reliable streaming aCROSS Aggregated unicast-multicast LinkS"
2. Project funded by Fed4FIRE+ OC5 (https://www.fed4fire.eu)
Signed-off-by: Javier Morgade <javier.morgade@ieee.org>
Cedric Roux