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e2sm_rc_module.py
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import datetime
from enum import Enum
from .asn1.e2sm_rc_packer import e2sm_rc_packer
from .utils import plmn_string_to_bcd, plmn_to_bytes
class e2sm_rc_module(object):
def __init__(self, parent):
super(e2sm_rc_module, self).__init__()
self.parent = parent
self.ran_func_id = 3;
self.e2sm_rc_compiler = e2sm_rc_packer()
# helper variables
self.requestorID = 0
def set_ran_func_id(self, ran_func_id):
self.ran_func_id = ran_func_id
def get_requestor_id(self):
self.requestorID += 1
self.requestorID %= 255
return self.requestorID
def _build_ric_control_request(self, control_header, control_msg, ack_request):
requestorID = [0x00, self.get_requestor_id()]
ran_func_id = [0x00, self.ran_func_id]
control_header_len = len(control_header)
control_mgs_len = len(control_msg)
ric_control_ack_request = ack_request
# asn1tools has some issue to generate RIC-Control-Request from asn1 files, therefore we need to build it manually
total_len = 33 + control_header_len + control_mgs_len
msg = [0x00, 0x04, 0x00, total_len, 0x00, 0x00, 0x05, 0x00, 0x1d, 0x00, 0x05, 0x00, *requestorID, 0x00, 0x00, 0x00, 0x05,
0x00, 0x02, *ran_func_id,
0x00, 0x16, 0x00, control_header_len+1, control_header_len, *control_header,
0x00, 0x17, 0x00, control_mgs_len+1, control_mgs_len, *control_msg,
0x00, 0x15, 0x00, 0x01, ric_control_ack_request << 6]
payload = bytes(hex_num for hex_num in msg)
return payload
def send_control_request_style_2_action_6(self, e2_node_id, ue_id, min_prb_ratio, max_prb_ratio, dedicated_prb_ratio, ack_request=1):
plmn_string = "00101"
sst = 1
sd = 1
# PLMN encoding
PLMN = plmn_string_to_bcd(plmn_string)
PLMN = plmn_to_bytes(PLMN)
# S-NSSAI encoding
sst = sst.to_bytes(1, byteorder='big')
sd = sd.to_bytes(3, byteorder='big')
# PRB ratio limits, i.e., [0-100]
min_prb_ratio = max(0, min(min_prb_ratio, 100))
max_prb_ratio = max(0, min(max_prb_ratio, 100))
dedicated_prb_ratio = max(0, min(dedicated_prb_ratio, 100))
if (max_prb_ratio < min_prb_ratio):
print("ERROR: E2SM-RC Control Request - Slice Level PRB Quota: max_prb_ratio ({}) cannot be smaller than min_prb_ratio ({})".format(max_prb_ratio, min_prb_ratio))
return
ue_id = ('gNB-DU-UEID', {'gNB-CU-UE-F1AP-ID': ue_id})
control_header = self.e2sm_rc_compiler.pack_ric_control_header_f1(style_type=2, control_action_id=6, ue_id_tuple=ue_id)
control_msg_dict = {'ric-controlMessage-formats': ('controlMessage-Format1',
{'ranP-List': [
# RRM Policy Ratio List, LIST
{'ranParameter-ID': 1, 'ranParameter-valueType': ('ranP-Choice-List', {'ranParameter-List': {'list-of-ranParameter': [{'sequence-of-ranParameters': [
#>RRM Policy Ratio Group, STRUCTURE
{'ranParameter-ID': 2, 'ranParameter-valueType': ('ranP-Choice-Structure', {'ranParameter-Structure': {'sequence-of-ranParameters': [
#>>RRM Policy, STRUCTURE
{'ranParameter-ID': 3, 'ranParameter-valueType': ('ranP-Choice-Structure', {'ranParameter-Structure': {'sequence-of-ranParameters': [
#Note that ID = 4 is missing in the spec.
#>>RRM Policy Member List, LIST
{'ranParameter-ID': 5, 'ranParameter-valueType': ('ranP-Choice-List', {'ranParameter-List': {'list-of-ranParameter': [{'sequence-of-ranParameters': [
#>>>>RRM Policy Member, STRUCTURE
{'ranParameter-ID': 6, 'ranParameter-valueType': ('ranP-Choice-Structure', {'ranParameter-Structure': {'sequence-of-ranParameters': [
#>>>>>PLMN Identity, ELEMENT
{'ranParameter-ID': 7, 'ranParameter-valueType': ('ranP-Choice-ElementFalse', {'ranParameter-value': ('valueOctS', PLMN)})},
#>>>>>S-NSSAI, STRUCTURE
{'ranParameter-ID': 8, 'ranParameter-valueType': ('ranP-Choice-Structure', {'ranParameter-Structure': {'sequence-of-ranParameters': [
#>>>>>>SST, ELEMENT
{'ranParameter-ID': 9, 'ranParameter-valueType': ('ranP-Choice-ElementFalse', {'ranParameter-value': ('valueOctS', sst)})},
#>>>>>>SD, ELEMENT
{'ranParameter-ID': 10, 'ranParameter-valueType': ('ranP-Choice-ElementFalse', {'ranParameter-value': ('valueOctS', sd)})}]
}})}]}})}]}]}})}]}})},
#>>Min PRB Policy Ratio, ELEMENT
{'ranParameter-ID': 11, 'ranParameter-valueType': ('ranP-Choice-ElementFalse', {'ranParameter-value': ('valueInt', min_prb_ratio)})},
#>>Max PRB Policy Ratio, ELEMENT
{'ranParameter-ID': 12, 'ranParameter-valueType': ('ranP-Choice-ElementFalse', {'ranParameter-value': ('valueInt', max_prb_ratio)})},
#>>Dedicated PRB Policy Ratio, ELEMENT
{'ranParameter-ID': 13, 'ranParameter-valueType': ('ranP-Choice-ElementFalse', {'ranParameter-value': ('valueInt', dedicated_prb_ratio)})}
]}})}
]}]}})}
]}
)}
control_msg = self.e2sm_rc_compiler.pack_ric_control_msg(control_msg_dict)
payload = self._build_ric_control_request(control_header, control_msg, ack_request)
self.parent.rmr_send(e2_node_id, payload, 12040, retries=1)
# Alias with a nice name
control_slice_level_prb_quota = send_control_request_style_2_action_6