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Adaptive adjustment method of wireless frame length of tree-network multi-hop wireless communication system and apparatus thereof
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A technology of multi-hop wireless communication and adaptive adjustment, applied in the field of wireless communication, can solve the problem of low transmission efficiency of the system
Active Publication Date: 2012-10-10
慕福奇
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The data transmission control unit of each node in the network independently and dynamically adjusts the wireless frame length between its child nodes according to the distance between nodes, channel status, service type, and data packet size; The load of the uplink from the node to the parent node dynamically adjusts the ratio of the downlink transmission time to the uplink transmission time in the wireless frame between adjacent nodes, which solves the problem of data transmission frames between nodes in the existing multi-hop system transmission scheme The structure length is relatively fixed, the ratio of downlink and uplink time slots remains unchanged, and the system transmission efficiency is not high under the condition of controlling multi-hop network transmission delay
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example 1
[0114] Example 1, an example of wireless frame length adjustment between each node and its child nodes:
[0115] An example of a wireless frame structure between nodes is Figure 5 shown. To simplify the analysis, here it is assumed that the downlink and uplink transmission times are the same, and the influence of the round-trip time of wireless signal propagation between nodes is ignored, then:
[0116] The average delay value T corresponding to the unit distance R It is 0.85*20 / 17=1ms; the wireless frame length maximum (T F_0_0 ,T F_1_0 ,T F_2_0 and T F_3_0 ( Figure 5 T M0 Indicates that )) is 3ms, and the corresponding downlink and uplink transmission time threshold T DL_R0 and T UL_R0 Both are 1.5ms; the maximum wireless frame length between node 1 and node 3, node 2 and node 5 (T F_1_1 and T F_2_1 ( Figure 5 T M1 Indicates that )) is 4ms, and the corresponding downlink and uplink transmission time threshold T DL_R1 and T UL_R1 Both are 2ms. In this way, ...
example 2
[0117] Example 2, an example of adjusting the ratio of the downlink transmission time to the uplink transmission time in the wireless frame between each node and its child nodes:
[0118] The wireless frame structure between each node is as follows: Figure 6shown. For downlink transmission time and uplink transmission time between node 0 and node 1, node 1 and node 2, node 1 and node 3, node 2 and node 4, node 2 and node 5, node 3 and node 6 The ratios are R0_1=1 / 1, R1_2=1 / 2, R1_3=1 / 3, R2_4=1 / 4, R2_5=1 / 4, R3_6=1 / 4.
[0119] The maximum wireless frame length T between node 0 and node 1, node 1 and node 2, node 2 and node 4, node 3 and node 6 M0 3ms; the maximum wireless frame length T between node 1 and node 3, node 2 and node 5 M1 is 4ms.
[0120] For the downlink and uplink transmission time threshold T between node 0 and node 1 DL_R0 and T UL_R0 Both are set to 1.5ms;
[0121] Downlink and uplink transmission time threshold T between node 1 and node 2 DL_R1 and T U...
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Abstract
The invention provides an adaptive adjustment method of a wireless frame length of a tree-network multi-hop wireless communication system. The method is characterized in that: according to a distance between nodes, a channel state, a service type and a data packet size, the each node in the network independently calculates the wireless frame length between the node and a sub-node; according to load conditions of a downlink from a father node to the sub-node and an uplink from sub-node to the father node, a proportion of downlink transmission time to uplink transmission time is dynamically adjusted. In a current multi-hop system transmission scheme, a data transmission frame structure length between the nodes is relatively fixed; a time slot proportion of the downlink to the uplink is constant; under the condition that multi-hop network transmission timedelay is controlled, system transmission efficiency is not high. By using the method of the invention, the above problems are solved.
Description
technical field [0001] The invention relates to a variable frame length self-adaptive transmission scheme for a wireless communication system of a tree or chain network, which can be used for a broadband wireless multi-hop relay network based on central or non-central control, and belongs to the field of wireless communication. Background technique [0002] The network architecture of the wireless system includes a centralized network and a distributed multi-hop network. The centralized network generally has a large network capacity, but due to the limitation of base station transmission power, the network coverage is generally within a few kilometers; the distance between nodes in a distributed multi-hop wireless network is relatively short, and each hop can complete a comparison The much higher data transmission rate of direct communication enables the high data transmission rate to be supported in long-distance end-to-end communication systems, and with the increase of ne...
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