A cross-layer dynamic threshold adjustment method combining amc and harq

Abstract

The present invention provides a cross-layer dynamic threshold adjustment method combining AMC and HARQ, comprising the following steps: 1), assuming that there are M+1 kinds of transmission modes in total, and the generation threshold is to divide the channel SNR into M+1 non-overlapping regions , to obtain the system packet error rate, the maximum number of retransmissions Nr, and the threshold γn for data transmission in each transmission mode; 2) In each transmission mode, compare the threshold γn for each data transmission with the bottom limit value Compare, when the threshold γn during each data transmission is lower than the bottom limit value, perform step 3); when the threshold γn during each data transmission is higher than the bottom limit value, then obtain the threshold value during each data transmission; 3 ), the system packet error rate is set as 1, and after the threshold is set as the bottom limit value, the threshold value γ'n during each data transmission is calculated, and the present invention performs data processing according to the comparison between the bottom limit value and the threshold value in each transmission mode. The dynamic selection of the threshold value during transmission can effectively improve the average spectrum efficiency of the system and improve the data transmission efficiency.

Description

technical field [0001] The invention belongs to the cross-layer design field of adaptive coding and modulation (AMC) combined with automatic hybrid retransmission request (HARQ) technology in a wireless communication system, and relates to a cross-layer dynamic threshold adjustment method combining AMC and HARQ. Background technique [0002] In the existing literature on cross-layer design, some introduce a cross-layer scheme that combines AMC and ARQ (Automatic Repeat-reQuest, automatic repeat request), but does not consider the delay of the packet; some The packet delay is considered, but the cross-layer model does not introduce the HARQ (Hybrid Automatic Repeat Request, hybrid automatic repeat request) mechanism, but only combines ARQ and AMC together; when some cross-layer joint designs are carried out, The thresholds of various modes of each transmission only require the packet error rate (PER) of the last transmission to meet certain requirements, which may cause the P...

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Problems solved by technology

[0002] In the existing literature on cross-layer design, some introduced a cross-layer scheme combining AMC and ARQ (Automatic Repeat-reQuest, automatic repeat request), but did not consider the delay of the packet; some The packet delay is considered, but the cross-layer model does not introduce the HARQ (Hybrid Automatic Repeat Request, hybrid automatic repeat request) mechanism, but only combines ARQ and AMC together; when some cross-layer joint designs are carried out, The thresholds of various modes of each transmission only require the packet error rate (PER) of the last transmission to meet certain requirements, which may cause the PER of the initial transmission to be unable to be within the normal range; some introduce a cross-layer design Dynamic threshold scheme, but when the PER curves of the first transmission and retransmission are very different, it is impossible to find a threshold that meets the requirements of the packet error rate; some based on the idea of ​​cross-layer design, propose an adaptive parameter optimization selection scheme, Combining AMC and HARQ, with the maximization of system spectral efficiency as the criterion, an optimization model is given under the premise of satisfying Qos, but it does not consider the delay requirement, nor is it extended to the MIMO model

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