LTE simulation problem

[Fan Wu]

Hello everyone, I'm currently working on a simulation of a UAM system. The GS stations are arranged in a grid pattern, for example, 5x5, with each GS spaced 2 km apart from its neighbors. Each GS dispatches 10 eVTOLs per minute, with their flight paths generated at the start of the program. When an eVTOL passes a GS, it receives periodic identity broadcasts from that GS and subsequently sends an authentication request (M5). Upon receiving M5, the GS replies with M6. Once an eVTOL receives M6 from a GS, it stops resending M5 to that GS. This handover process repeats continuously.
However, in an LTE environment, it seems each eVTOL can only receive RRC signaling once per second to detect neighboring GSs before sending M5, with the subsequent steps remaining the same.
The current issue is: despite reducing the GS layout to 3x3 and lowering eVTOL dispatches to 5 per minute per GS, the SINR/RSRP print statements I added show no effect. The logs are flooded with "Not connected yet. RRC State is IDLE_RANDOM_ACCESS" messages, let alone M5 reception or M6 transmission. What could be causing this? Could any experts advise on the next steps?

[Fan Wu]

I tried the EpsBearer class and  added the output of pcap file, but the result is depressed: ue_i1 file contains UDP packet M5, but link file for pgw does not contain any UDP packet. 

It means that the pgw does not receive any M5 packet. 

Also, I doubted the packet length, since in my scheme, the lengths of the two messages were over 1500 bytes. But when I lower the lengths of the message. There was not any prompt about receiving M5 by GS. Adjusting the MTU setting in code yielded the same result”

I do not know how to modify the program now...  Could any experts advise on the next steps?

[압둘하미드이드리스]

What is UAM?

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