8.6 3G/HSPA
8.6.1 Bearers and Their Attributes
End-to-end service in 3G, with the related bearers is shown in Figure 8.11. The attributes of the UMTS bearers are listed in Table 8.5.
Figure 8.11 3G bearers [35].
Table 8.5 UMTS bearer service attributes [35].
| Attribute | Description |
| Residual bit error rate (BER) | Indicates the undetected BER in the delivered SDUs. If no error detection is requested, residual BER indicates the BER in the delivered SDUs. |
| SDU format information | Indicates the exact size of SDUs |
| Sdu error rate | Indicates the fraction of SDUs lost or detected as erroneous. |
| Delivery of erronous SDUs | Indicates whether erroneous SDUs are delivered, or discarded. |
| Max SDU size | Maximum SDU size for which the network shall satisfy the negotiated QoS. |
| Delivery order | Defines whether the UMTS bearer provides in-sequence SDU delivery, or not. |
| Transfer delay | Maximum delay (95th percentile of the distribution of delay) for all delivered SDUs during the bearer service. |
| Traffic class | Defines the type of application for which the bearer service is optimized. Values: conversational/streaming/interactive/background |
| Traffic handling priority (THP) | Relative importance of SDUS compared to SDUs of other bearers within interactive class. Values: 1, 2 or 3. Used in scheduling, as an alternative to absolute guarantees. |
| Allocation and retention priority (ARP) | Priority of the ... |
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