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

* only set up timer for sending requests
* simplify interface for timer setup
* on timer expiry, do not pass through stats request function but
  directly send the reply
* Remove whatever report structure and use stats request directly for
  inferring the data to send

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

hotfix: better CQI requests, especially for TDD

See merge request oai/openairinterface5g!708

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

 --> also adding TDD monolithic test at 20MHz with default scheduler
 --> putting IF4.p5 TDD scenarios with default scheduler
Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Fix cqi_req clear timing, and schedule PUSCH when CQI has not been received for a long time in fairRR scheduler.

In TDD mode, CQI requests are not possible in special subframes (at
least for some TDD configurations, see 36.213 7.2.3 that says "a
DL subframe is valid if it does not contain a DwPTS field if the
length is less than  7680 Ts").

In the code, we simply disable CQI requests in special subframes,
no matter what the length of DwPTS.

A problem can arise if the DCI0 for a given UE are sent only in
those special subframes. In this case the UE will never report
CQI and the eNB will use low MCS for this UE, impacting performances.

Another, related, problem is when there are several UEs. There again
one UE might always get its DCI0 in special subframes and thus never
report CQI. There again, performance issues.

This commit is an attempt to improve the situation.

It does two things.

1 - tag the UE as schedulable in the function UE_is_to_be_scheduled
    if the cqi_req_timer is expired

2 - use cqi_req_timer as a criterium when ordering UEs for UL scheduling

The value chosen for the expiration of the cqi_req_timer in
UE_is_to_be_scheduled is quite high (300) because as the code is
today we may overschedule the UE for short bursts until we receive
a CQI from the UE. [TODO: fix the code properly to avoid this behavior.]

Note: the fairRR scheduler has not been analyzed and this commit may
      not fix anything in case the fairRR scheduler is used.

Develop Integration Branch: 2019 week 41

See merge request oai/openairinterface5g!689

    initial support for iperf in distributed environment
Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

  - Add more IP routes / rules
  - OAI UE should be pingable!
  - Relative time column added to HTML report
Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

  -- Adding the python framework of build and test to inria r2lab pipeline
  -- R2LAB pipeline has logCollections and artifacts storing
  -- Python framework should support latest Rel14 OAI openair-cn/cn-cups EPC
  -- Pipeline uses the latest version of booking-lease script (by duration)
  -- Support for distributed smartphone adb servers
  -- Initial scenarios:
     ** Build on one OAI 4G eNB and one OAI 4G UE
     ** Test in FDD band7 / 5MHz / TM1 in noS1 configuration
     ** Test in FDD band7 / 5MHz / TM1 with latest OpenAir-CN-CUPS --> just attachment
Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Develop Integration Branch: 2019 week 36

The following MR are included:

* MR 653 : Feature LTE-M PUSCH CE - 8 Repetitions
* MR 654 : Rfsimu config and CI scripting updates

  -- Properly stopping FlexRan Ctl in case of failure
Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

  -- IperfNoS1 when eNB crashed
  -- LTE-M module failed attachment
  -- LTE-M module pinging
Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>