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Is the short message of 86( 10)655 13898 connected?
Scientific basis:
WCDMA R99 and R4 systems can provide the highest uplink and downlink rates, which are 64kbps and 384kbps respectively. In order to compete with CDMA 1XEV-DO, WCDMA introduced HSDPA in R5 specification and HSUPA in R6 specification. HSDPA and HSUPA are collectively called HSPA.
Extended data:
HSDPA uses a shared downlink channel for data transmission. By introducing adaptive modulation and coding, hybrid automatic retransmission, fast scheduling, 16QAM and other technologies, higher data throughput can be obtained, and the data retransmission degree and transmission delay can be effectively reduced.
Among them, adaptive modulation and coding (AMC) is used to realize wireless link adaptation, and different coding methods and modulation orders are selected according to channel conditions. Hybrid automatic retransmission refers to introducing forward error correction code to correct errors when the received data packet has errors, and sending a request message to request retransmission if it exceeds the error correction range.
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