| CPC H04W 52/0235 (2013.01) | 21 Claims |

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1. A data transmission method in a fifth-generation (5G) mobile communication network, comprising:
configuring, by a second communication node, a configuration parameter for a first communication node;
transmitting, by the second communication node, a first message to the first communication node, wherein the first message comprises a power saving signal, wherein the configuration parameter is configured to make the first communication node checking the power saving signal in a first time period prior to a start of a discontinuous reception; and
transmitting, by the second communication node, a second message to the first communication node, wherein the second message comprises a reference signal;
wherein a first situation arises during the data transmission method in which for one bandwidth part (BWP), the configuration parameter does not comprise a number of multi-input multi-output layers, and the first communication node applies to the one BWP a value of a maximum number of multi-input multi-output layers for a serving cell, and
wherein a second situation arises during the data transmission method in which for the one BWP, the configuration parameter comprises a maximum number of multi-input multi-output layers, and the maximum number of multi-input multi-output layers comprised by the configuration parameter is applied to the one BWP.
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