HARQ


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HARQ

(Hybrid Automatic Repeat ReQuest) A technique that enables faster recovery from errors in cellular networks by storing corrupted packets in the receiving device rather than discarding them. Even if retransmitted packets have errors, a good packet can be derived from the combination of bad ones. See HSPA.
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This is the result of SystemVue's new sub-frame communication HARQ support, which extends the physical layer to allow new dynamic behaviors, while retaining the versatility and RF accuracy of the physical layer approach.
6 GHz frequency bands, this new carrier-class product is compact in size and supports advanced mobility features such as handoffs, HARQ, Re-use 1 and 4x4 RF diversity.
Real-time feedback from the eNB under test enables dynamic control of HARQ and RF frame timing required for performing the closed loop throughput measurements outlined performance requirements conformance tests in the LTE specification.
These include EDCH for 3GPP, sub-block de-interleaving and de-interlacing with HARQ support for 3G-LTE and WiMAX.
Supporting 33 Mbps in MIMO mode as well as 20 Mbps in HARQ mode along with 50 ms hand-off latency, the BCS200 has set a number of performance benchmarks that are still unmatched today, clearly establishing Beceem's leadership in the WiMAX[TM] ecosystem.
Alvarion demonstrated ASN gateway (ASN-GW) and its award-winning BreezeMAX[TM] base station with HARQ functionality, designed to ensure continuous quality-of-service for Mobile WiMAX at 2.
Specific capabilities include matrix A and matrix B signals for downlink, uplink collaborative MIMO, and creation of HARQ bursts and uplink sounding zones.