Hi.

Regarding the new Chateau 5G R16, according to TAC provided in website (TAC=86945405), it is using the Quectel RG520F-EU modem.

I didn't find the documentation related to this modem, especially the AT command one.

Looking for it.

Stefano

Afaik all Chateau models have Quectel modems (maybe other LTE MT devices too or all), in MT devices brochures you can find modem model, like for this device where LTE modem model is stated R11mL-RG520F, strip MT model prefix up to dash you will get RG520F, Googling quectel RG520F AT command manual you get manual from Quectel forum.

I am surprised that, also with this new version of chipset R16, it doesn't support the possibility to request for dedicated flow in 5G as described in 3GPP 23.502 Section 4.3.3 (PDU Session Modification, UE initiated).

Replaced with a more detailed post down below.

Could be on MNO side since users are reporting issues regarding PDU Session modification to Open5GS using Chateau 5G and it was fixed on Open5GS side, like this issue.

@sbert, do you have a specific issue you're trying to address using dedicated flow?

Dedicated flow relies on the capabilities of the user equipment and the services provided by the MNO. Some advanced 5G devices may support it but it's not a common feature on consumer devices equipped with chips like the Quectel RG520F.

If operating in NSA mode, where the EPC control plane is located in the "old" 4G/LTE core which then manages the flow parameters, flexibility might be somewhat limited compared to SA. However, even in SA mode limitations might exist depending MNO capabilities and what you want to controll like latency, bandwidth etc. It may also be limited due to natural causes such as bandwidth constraints in rural areas and similar restrictions, as well as the specific features that the NMO has decided to make accessible to the end-user depending on the service level you are paying for.

For more detailed information, check what your MNO has to offer.

I am surprised that, also with this new version of chipset R16, it doesn't support the possibility to request for dedicated flow in 5G as described in 3GPP 23.502 Section 4.3.3 (PDU Session Modification, UE initiated).

Unfortunately, does not supports, nor are supported by Quectel/Qualcom on other platforms. In general as @sbert wrote, consult with MNO about available options what they can provide to accomplish goal.

One use case it to connect a camera (e.g. surveillance e/o industrial) to the Chateau and instruct the modem (UE) to request to establish a dedicated flow with Guaranteed Bit Rate (GBR) 5QI as 71, 72 ... 76 for the video stream.

Guaranteed bit-rate might not be the only consideration for CCTV/VMS systems but I get your point.

Capabilities like for example guaranteed latency, bandwidth/bitrate, QoS, and reliability within PDUs are controlled by the 5G Core Network through the "Policy Control Function" (PCF). The NMO's provisioning system manages the PCF settings based on the customer's preferences that is stored and managed by the customer support systems (OSS/BSS).

This means the customer's device doesn't necessarily need to initiate the process for a dedicated flow as it can also be done by the MNO. The ability to control the PDU in the device is mainly required for changing settings of an existing PDU, selecting preset profiles and similar actions.

PCF is the Network Function responsible to validate the request (from UE or an external AF via N5/Rx interface) and trigger the action for establishing a Dedicated Flow. PCF doesn't initiate a Dedicated Flow by itself (by 3GPP).

In 3GPP 23.502 (Section 4.3.3, Figure 4.3.3.2-1), the PDU Session Modification Request (starting the procedure for a Dedicated Flow Establishment) can initiated by UE (option 1a); checking the specification 3GPP 27.007 - AT command set for User Equipment (UE), Section 10, are described the AT commands for this case.

Regarding the Chateaus product, I understand and got confirmation that it is designed for basic FWA use cases.

My interested, working for a company providing 5G private networks, is looking for UE devices and modems in the market able to address more advanced scenarios.

My question now is: compared to the old modem, what this new RG520F R16 Quectel modem offers from 5G connectivity point of view?

You might have misunderstood or somehow missed what I wrote but the session is "controlled" by PCF. When a dedicated flow is initiated from the network its initial set of flow control parameters are retrieved from the MNO's "operations center" (OSS/BSS) which manages the contracted service levels.

Regarding the RG520F, if you work for a 5G company you likely have better chances to find detailed specifications from the manufacturer and other relevant information about the 5G chip market from channels like ACIA or the 5G Manufacturing Forum, rather than from this user forum.