Telecommunication

What is UA Unnumbered Acknowledgement

Admin

Jul 4, 2024 — 1 min read

I apologize for the previous inaccurate information regarding UA (Unnumbered Acknowledgement) in cellular networks.

In cellular network protocols (specifically GSM, GPRS, and EDGE), UA (Unnumbered Acknowledgement) doesn't exist as a standalone message. It was previously mentioned incorrectly as a response to SABM (Set Asynchronous Balanced Mode) messages.

Here's a breakdown of the accurate cellular network message exchange:

SABM (Set Asynchronous Balanced Mode): This message is used on the control plane (C-plane) to establish a logical connection between network entities (e.g., mobile station and base station) for asynchronous data exchange. It initiates a connection and requests the receiver to send acknowledgments for received data packets.
Unnumbered Acknowledgement (Concept): While UA (Unnumbered Acknowledgement) isn't a separate message in these protocols, the concept of acknowledging received data exists.

Cellular network protocols like GSM and GPRS utilize piggybacking techniques within other messages to convey acknowledgments. This means the acknowledgement for a received data packet is embedded within a subsequent data packet sent in the opposite direction.

For instance, after receiving a data packet, the receiver might send a response data packet containing an acknowledgement bit or sequence number indicating successful reception. This eliminates the need for a dedicated UA message and optimizes network efficiency.

Key Points:

UA (Unnumbered Acknowledgement) is not a distinct message in GSM, GPRS, and EDGE protocols.
Cellular network protocols often employ piggybacking techniques for acknowledging received data packets within other messages.
This approach reduces message overhead and streamlines communication.

Alternative Acknowledgement Mechanisms:

In more modern cellular network protocols like LTE (Long-Term Evolution) and 5G NR (New Radio), dedicated acknowledgement mechanisms might be employed depending on the specific radio access technology and control plane procedures. These protocols may utilize separate control messages for acknowledgments or employ different techniques compared to GSM/GPRS/EDGE.

I hope this explanation clarifies the concept of UA in cellular networks. If you have any further questions about cellular network protocols or acknowledgements in LTE/5G NR, feel free to ask!

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