Table 2 System-level simulation parameters.
From: An Efficient Scheduling Scheme to Enhance the Capacity of VoIP Services in Evolved UTRA Uplink
Parameter | Assumption |
|---|---|
Source traffic packet overhead | AMR 12.2 kbps, |
| Â | VAF = 0.5, 2-state Markov, |
| Â | ROHC 4 bytes [IETF RFC 3059] |
Cellular layout | Hexagonal grid, 19 sites, 3 sectors |
|  | (eNB-to-eNB 0.5 km) |
|  | Carrier frequency 2 GHz |
System bandwidth | 5 MHz |
Propagation loss | Path loss = −128.1–37.6*log(R) |
Shadowing model | Log normal Std. dev. 8 dB, |
| Â | [Hata model] |
User speed | 3 km/h |
Antenna gain | Node B 14 dB/UE 0 dB |
Penetration loss | −20 dB |
User Tx. Max. power | 24 dBm |
Fading model | Typical urban (TU) |
Thermal noise density | −174 dBm/Hz |
Number Rx ant. | 2 |
Retransmission | No RLC retransmission (No ARQ), |
| Â | sync. HARQ (max. retrial = 4), |
| Â | HARQ process number = 8, |
| Â | chase-combining |
Power control | 50 Hz (sounding RS-based closed-loop method) |
Scheduling | Persistent scheduling with a resource sharing using user pairing, |
| Â | (repeated pattern period = 20 milliseconds) |
MCS level | QPSK, 0.55 coding rate, |
|  | talk-spurt period (2 RBs assign); |
|  | silent period (1 RB assign) |
Link curve mapping | Effective SIR method (ESM) |
Link curve TTI | 1 millisecond |
Considered overheads | 29%(pilot and control overheads) |
| Â | 2 long blocks for DM RS |
|  | 4 RBs for control signals |