Table 3 Main downlink parameters of IEEE 802.16 m [16]
Topic | Description | IEEE 802.16 m parameter |
|---|---|---|
Basic modulation for data | Modulation schemes for data | QPSK, 16QAM, 64QAM |
Basic modulation for control | Modulation schemes for control | QPSK |
Duplexing scheme | TDD or FDD | TDD/FDD |
Subchannelization for data | Contiguous/Distributed Resource Units and permutations | - Subband LRU (SLRU) as defined in Sections 15.3.5.1-15.3.5.3 of [3]; 12 equal-size allocations spanning the complete duration of the time resources (DL portion of the TDD frame, DL FDD frame) NLRU as defined in Sections 15.3.5.1-15.3.5.3 of [3]; 6 equal-size allocations spanning the complete duration of the time resources (DL portion of the TDD frame, DL FDD frame) |
Subchannelization for control | Contiguous/distributed resource units and permutations | DLRU as defined in Sections 15.3.5.1-15.3.5.3 of [3] |
Downlink Pilot Structure | Pilot structure, density etc. | Depends on the number of streams per allocation:1, 2, 3, and 4 pilot streams as defined in Section 15.3.5.4.1 of [3]; 2 dB pilot power boosting for 1, 2 streams and 0 dB power boosting for 3, 4 streams |
Multi-antenna Transmission Format for data | Multi-antenna configuration and transmission scheme | - In the case of SLRU:6-bit transformed codebook; adaptive switching among one stream SU-MIMO, two stream MU-MIMO, three stream MU-MIMO and four stream MU-MIMO In the case of NLRU: long-term BF by using the quantized long-term covariance matrix or wideband PMI; adaptive switching among one stream SU-MIMO, two stream MU-MIMO, three stream MU-MIMO and four stream MU-MIMO |
Multi-antenna transmission format for A-A-MAP | Multi-antenna configuration and transmission scheme | OL SFBC + non-adaptive precoding (T x diversity) |
Receiver structure | Receiver interference awareness | MMSE for both channel estimation and data detection |
Data channel coding | Channel coding schemes | Convolutional turbo coding (CTC) 1/3 |
Control channel coding for A-A-MAP | Channel coding schemes and block sizes | As described in Section 15.3.6.3.2.2 of [3] with MLRU size equal to 56 tones |
Scheduling | Demonstrate performance/fairness criteria in accordance to traffic mix | Proportional Fair for full buffer data |
Link adaptation | Modulation and coding schemes (MCS), CQI feedback delay/error | Choice of 16 MCS schemes inclusive of coding rate and rate matching, see Section 15.3.12.1.2 of [3] |
Link to system mapping | MI-based PHY abstraction | MMIB PHY abstraction [2] |
HARQ | HARQ transmission specifics | Chase Combining Asynchronous, adaptive, 3 subframe ACK/NACK delay, maximum 4 HARQ retransmissions, minimum retransmission delay 3 subframes |
Interference model | Co-channel interference model, fading model for interferers, number of major interferers, threshold | Explicitly modeled Average interference on used subcarriers per LRU (subband or miniband) in PHY abstraction |
Control signaling | Message/signaling format, overheads | Signaling errors were modeled for A-A-MAP and HF-A-MAP and sounding estimation errors were modeled for A-MIDAMBLE |
Control channel overhead | L1/L2 Overhead | Dynamic overhead modeling for A-A-MAP and HF-A-MAP and fixed overhead modeling for non-user specific A-MAP (NUS-A-MAP), A-PREAMBLE, A-MIDAMBLE, and SFH |