Re-transmission control method, communication system, and device

Abstract

A re-transmission control method,a communication system,and a device. The re-transmission control method comprises:the media access control (MAC) entity of an eNB transmits an MAC protocol data unit (PDU) to a UE through a hybrid automatic repeat request (HARQ) channel,said MAC PDU content including handover command information; the MAC entity of the eNB receives from the UE HARQ acknowledgment information transmitted through the HARQ channel;if the HARQ channel used by the MAC entity of the eNB to transmit the MAC PDU and the HARQ channel used by the UE to transmit the HARQ acknowledgment information are the same, the radio link control entity of the eNB is notified to stop transmitting the handover command information. Air interface resources are conserved.

Description

technical field [0001] The present invention relates to the field of mobile communication, in particular to a retransmission control method, communication system and equipment. Background technique [0002] In the Long Term Evolution (LTE) system, in order to counteract the influence of wireless channel time-varying and multipath fading on signal transmission, a hybrid automatic repeat request is introduced in the Media Access Control (MAC) layer (Hybrid Automatic Repeat Request, HARQ) technology. Among them, the HARQ technology can improve the reliability of signal transmission, and has become one of the indispensable key technologies in the LTE system. [0003] In the LTE system, the retransmission of the handover command message can be realized by using the HARQ technology, so as to ensure that the handover command message is successfully received by the user equipment (User Equipment, UE). The existing handover command retransmission method can be summarized as follows...

AI Technical Summary

Problems solved by technology

In the above handover command retransmission method, the RLC entity of the eNB cannot know whether the UE has successfully received the handover command message, and in order to ensure that the handover command message is successfully received by the UE, the RLC entity of the eNB only has to send the RLC PDU to the MAC of the eNB multiple times. entity (this process is also called Automatic Repeat Request (Automatic Repeat Request, ARQ) retransmission); each ARQ retransmission of the RLC entity of the eNB will cause the MAC entity of the eNB to encapsulate the RLC PDU into a MAC PDU again and use The HARQ channel is sent to the MAC entity of the UE through the air interface (this process is also called HARQ retransmission)

[0004] In practice, it is found that in the above handover command retransmission method, even if the handover command message has been correctly received by the UE, the RLC entity of the eNB still triggers the ARQ retransmission of the RLC entity of the eNB, and the MAC entity of the eNB caused by the ARQ retransmission HARQ retransmission, which seriously consumes system air interface resources

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