Method, device and system for feeding back response information

Abstract

The embodiment of the invention discloses a method for feeding back response information, which comprises the following steps: setting a first threshold of the number of sub data packets at a receiving terminal and receiving N sub data packets of a large data packet; carrying out cyclic redundancy coding CRC check for the N sub data packets respectively; and when the N is larger than the first threshold, respectively feeding back response information for the N sub data packets according to the result of CRC check. The embodiment of the invention also provides a corresponding device and a system. Through the method, the device and the system provided by the embodiment of the invention, the data packet receiving terminal transmits a feedback response bit map to a data packet, and a data packet transmission terminal only needs to transmit the data packets with correct CRC check according to the bit value of the response bit map, thereby the bandwidth resource is saved.

Description

technical field [0001] The invention relates to the communication field, in particular to a technology for feeding back response messages. Background technique [0002] In Air Interface Evolution (AIE) and Long Term Evolution (LTE) systems using OFDM technology, it is necessary to send large data packets to meet the needs of high-speed users. Restriction, for a large data packet larger than 6144 bits, the sender should divide it into multiple sub-packets, and add a 24-bit cyclic redundancy check (Cyclic Redundancy Check, CRC) to each sub-packet at the physical layer, The sub-packet after adding the CRC must be less than or equal to 6144 bits, and then send out after encoding, interleaving and other processing. After receiving each sub-packet, the receiving end first performs CRC check on each sub-packet, and when all sub-packets pass the CRC check, then performs CRC check on the entire data packet, and sends a response message, If the entire data packet passes the CRC chec...

AI Technical Summary

Problems solved by technology

[0003] Since large data packets occupy more time-frequency resources and there is frequency selective fading, it is impossible for all sub-data packets to be correctly CRC-checked at the receiving end at the same time. Therefore, during the HARQ retransmission process, when most sub-data packets have been correct CRC check, but only a few sub-packets cannot be correctly CRC-checked, because the sender has not received the ACK, it is necessary to resend all the sub-packets of the large data package, wasting bandwidth resources

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