Research Article
Towards a QoE-Driven Resource Control in LTE and LTE-A Networks
Table 3
Configuration parameters along protocol stack.
| Layer | Parameter | Value |
| PHY | Carrier frequency | 2 GHz | System bandwidth | 20 MHz | Antenna configuration | 1-layer MIMO (beamforming) | Precoding | LTE 4-words codebook | Channel type | Extended pedestrian A (at 4 km/h) | Channel estimation | Zero forcing | MIMO detection | MMSE | Target BLER | 10% | Control channel overhead | From 1 to 3 OFDM symbols | Modulation/coding rate | 16 CQI table (4 bits) | Channel coding scheme | Turbo codes + SOVA | Average SNR | 20 dB | MAC | HARQ model | Incremental Redundancy + Chase Combining | Scheduling method | Proportional fair | RLC | Maximum number retransmissions | 1 for web and YouTube, 0 for VoIP | PDCP | Header compression | Enabled for VoIP, disabled for web and YouTube | IP | End-to-end delay (excluding the radio interface) | Variable (from 0 to 250 ms) | TCP | Maximum segment size | 1460 bytes | initial congestion window | 1 segment | Advertised receiver window | 32 kbytes | #ACKs per segment | 1 | SYN timeout | 3 s | APP | | | Web | Web page size | 100 kB text + variable # of objects of 20 kB each | HTTP version | 1.1 (persistent TCP connection ) | YouTube | Video length | 250 s | Video coding rate | 512 kbps | Client data buffer necessary to start the playback | 32 s | Buffer threshold that triggers a rebuffering event | 2 s | VoIP | Voice coding rate | 8.85 kbps and 23.85 kbps |
|
|