ARP
ARP is expanded two ways:
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ARP is a TCP/IP protocol used to convert an IP address into a physical address, such as an Ethernet address.
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allocation and retention priority
An EPS bearer QoS parameter that prioritizes bearer establishment or modification requests when resources are limited. An ARP can determine that existing bearers with a relatively low priority should be dropped to free up needed resources. An ARP can also determine whether a bearer should be dropped by another bearer with a higher priority. See 3GPP TS 23.203