A harq-based downlink scheduling method and device

Abstract

The invention relates to the communication field, particularly discloses a downlink scheduling method and device based on an HARQ (hybrid automatic repeat request) and is used for increasing the resource utilization rate. The method comprises steps as follows: evaluating the channel quality of UE (user equipment) and calculating the residual cache of the UE; when determining that the channel quality evaluation result of the UE is lower than a preset channel quality threshold and the residual cache of the UE is less than the cache required by the scheduling, increasing the available maximum HARQ process number and determining the process adopted by current scheduling. Thus, when the residual cache of the UE is insufficient, the downlink available process number can be adjusted adaptively in real time, the downlink data transmission reliability can be guaranteed, and the resource utilization rate can be increased.

Description

technical field [0001] The present invention relates to the communication field, in particular to a HARQ-based downlink scheduling method and device. Background technique [0002] In the process of wireless communication, if the previous attempt to transmit data fails, the data packet will be required to be retransmitted to ensure the reliability of the transmitted data. Such a transmission mechanism is called Automatic Repeat Request (ARQ). In the presence of problems such as noise and user (User Equipment, UE) interference, a form of protection is usually added to the packet data, called forward error correction (Forward Error Correction, FEC), hybrid automatic repeat request (Hybrid Automatic Repeat Request, HARQ) is a technology combining FEC and ARQ. [0003] The 3rd Generation Partnership Project (3rd Generation Partnership Project, 3GPP) standard stipulates that the HARQ technology is adopted in the Long Term Evolution (LTE) system, which can ensure the correct trans...

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Problems solved by technology

[0007] 1) Some HARQ processes are reserved for high-priority specific data streams to prevent lower-priority data packets from being replaced by higher-priority data, but this method limits the scenario of continuous transmission of large data, and it is difficult to reach the peak value throughput;

[0008] 2) Utilize the UE to determine the number of HARQ processes that can be supported according to the number of available resources. After the UE sends the information indicating the number to the base station, it waits for the base station to deliver the scheduling. However, this method depends on the evaluation capability of the UE and also increases signaling overhead;

[0009] 3) According to the activation or deactivation status of each of the multiple HARQ processes included in the received signal, the wireless transmitting / receiving unit activates or deactivates a specific HARQ process, and controls the uplink interference by adjusting the balance of the number of HARQ processes, but this method Only the newly transmitted data is considered, and the occupation of the process allocation by the retransmitted data is not considered

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