Remove unused and outdated documentation

doc/README.md

@@ -71,8 +71,6 @@ There is some general information in the [OpenAirInterface Gitlab Wiki](https://
 Legacy unmaintained files:
 - [`L2NFAPI_NOS1.md`](./L2NFAPI_NOS1.md), [`L2NFAPI_S1.md`](./L2NFAPI_S1.md):
   old L2simulator, not valid anymore
-- [`SystemX-tutorial-design.md`](./SystemX-tutorial-design.md): old, high-level
-  documentation
 - [`UL_MIMO.txt`](./UL_MIMO.txt): UL-MIMO specific notes
 
 # Designs

doc/SystemX-tutorial-design.md

-# OpenAirInterface for SystemX
-
-# Terminology
-
-****This document use the 5G terminology****
-
-**Central Unit (CU):** It is a logical node that includes the gNB
-functions like Transfer of user data, Mobility control, Radio access
-network sharing, Positioning, Session Management etc., except those
-functions allocated exclusively to the DU. CU controls the operation of
-DUs over front-haul (Fs) interface. A central unit (CU) may also be
-known as BBU/REC/RCC/C-RAN/V-RAN/VNF
-
-**Distributed Unit (DU):** This logical node includes a subset of the
-gNB functions, depending on the functional split option. Its operation
-is controlled by the CU. Distributed Unit (DU) also known with other
-names like RRH/RRU/RE/RU/PNF.
-
-In OpenAir code, the terminology is often RU and BBU.
-
-# OpenAirUsage
-
-## EPC and general environment
-
-### OAI EPC
-
-Use the stable OAI EPC, that can run in one machine (VM or standalone)
-
-Draft description:
-<https://open-cells.com/index.php/2017/08/22/all-in-one-openairinterface-august-22nd/>
-
-## Standalone 4G
-
-EPC+eNB on one machine, the UE can be commercial or OAI UE.
-
-### USRP B210
-
-Main current issue: traffic is good only on coaxial link between UE and
-eNB (probably power management issue).
-
-### Simulated RF
-
-Running eNB+UE both OAI can be done over a virtual RF link.
-
-The UE current status is that threads synchronization is implicit in
-some cases. As the RF simulator is very quick, a “sleep()” is required
-in the UE main loop
-
-(line 1744, targets/RT/USER/lte-ue.c).
-
-Running also the UE in the same machine is possible with simulated RF.
-
-Running in same machine is simpler, offers about infinite speed for
-virtual RF samples transmission.
-
-A specific configuration is required because the EPC Sgi interface has
-the same IP tunnel end point as the UE.
-
-So, we have to create a network namespace for the UE and to route data
-in/out of the namespace.
-
-```bash
-ip netns delete aNameSpace 2&gt; /dev/null
-
-ip link delete v-eth1 2&gt; /dev/null
-
-ip netns add aNameSpace
-
-ip link add v-eth1 type veth peer name v-peer1
-
-ip link set v-peer1 netns aNameSpace
-
-ip addr add 10.200.1.1/24 dev v-eth1
-
-ip link set v-eth1 up
-
-iptables -t nat -A POSTROUTING -s 10.200.1.0/255.255.255.0 -o enp0s31f6 \
--j MASQUERADE
-
-iptables -A FORWARD -i enp0s31f6 -o v-eth1 -j ACCEPT
-
-iptables -A FORWARD -o enp0s31f6 -i v-eth1 -j ACCEPT
-
-ip netns exec aNameSpace ip link set dev lo up
-
-ip netns exec aNameSpace ip addr add 10.200.1.2/24 dev v-peer1
-
-ip netns exec aNameSpace ip link set v-peer1 up
-
-ip netns exec aNameSpace bash
-```
-
-After the last command, the Linux shell is in the new namespace, ready
-to run the UE.
-
-To make user plan traffic, the traffic generator has to run in the same
-namespace
-
-```bash
-ip netns exec aNameSpace bash
-```
-
-The traffic genenrator has to specify the interface:
-
-```bash
-route add default oaitun_ue1
-```
-
-or specify the outgoing route in the traffic generator (like option “-I”
-in ping command).
-
-## 5G and F1
-
-Today 5G achievement is limited to physical layer.
-
-The available modulation is 40MHz, that require one X310 or N300 for the
-gNB and a X310 or N300 for the nrUE.
-
-### Usage with X310
-
-Linux configuration:
-<https://files.ettus.com/manual/page_usrp_x3x0_config.html>
-
-We included most of this configuration included in OAI source code.
-
-Remain to set the NIC (network interface card) MTU to 9000 (jumbo
-frames).
-
-### Running 5G
-
-Usage with RFsimulator:
-
-**gNB**
-
-```bash
-sudo ./nr-softmodem -O ../../../targets/PROJECTS/GENERIC-LTE-EPC/CONF/gnb.band78.tm1.106PRB.usrpn300.conf
-```
-
-**nrUE**
-
-```bash
-sudo ./nr-uesoftmodem --numerology 1 -r 106 -C 3510000000 -d --rfsimulator.serveraddr 127.0.0.1
-```