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 |
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