Data transmission methods and apparatuses using the same

摘要

A mobile communication device with a wireless module and a controller module is provided for improving data throughput by dynamically adjusting a window size of a communication protocol layer. The wireless module performs wireless transceiving to and from a service network. The controller module measures a link quality of the service network associated with a first protocol layer via the wireless module, and determines a number of transmission layers supported for spatial multiplexing associated with the first protocol layer. Also, the controller module adjusts a data transmission parameter associated with a second protocol layer according to the link quality and the number of transmission layers associated with the first protocol layer. Particularly, the second protocol layer is hierarchically higher than the first protocol layer in a multi-layer protocol stack.

主权项

1. A mobile communication device, comprising:
a wireless module, performing wireless transceiving to and from a service network; and a processor, measuring a Channel Quality Indicator (CQI) of a downward transmission link from the service network associated with a layer via the wireless module, determining a Rank Indicator (RI) used for Multiple-Input Multiple-Output (MIMO) associated with the Physical layer, and adjusting a Transmission Control Protocol (TCP) or Internet Protocol (IP) window size associated with a Transport layer or Network layer according to the CQI of the downward transmission link and the RI used for MIMO associated with the Physical layer, wherein the Transport layer or Network layer is hierarchically higher than the Physical layer in a multi-layer protocol stack, and wherein the adjusted TCP or IP window size equals to:(MaxTCPWindowSize-MinTCPWindowSize)×CQI_Indexed⁢_TBSMAX_CQI⁢_TBS÷R⁢⁢I×Weight wherein the MaxTCPWindowSize represents a maximum TCP/IP window size, the MinTCPWindowSize represents a minimum TCP/IP window size, the CQI_Indexed_TBS represents a Transport Block Size (TBS) corresponding to the measured CQI, the MAX_CQI_TBS represents another TBS corresponding to a maximum CQI, and the Weight represents a constant or a weighting function of the measured CQI.