Pdu For Your Pmp

The data transmission system at least includes a transmitting terminal and a receiving terminal

. After a connection is established between the transmitting terminal and the receiving terminal, data is transmitted through a predetermined first data message pdu. When the receiving terminal found that an error rate of the pdu is excessively high, a second data message pdu length is calculated, and the transmitting terminal is informed to use the most appropriate pdu length to transmit data. The data transmission system dynamically adjusts the pdu length to achieve the effect of enhancing the data transmission capacity, so as to solve the problems concerning power consumption and interference between users caused by the process of enhancing the data transmission capacity by way of increasing the transmission power.

A data transmission system for dynamically adjusting a protocol data unit (pdu) length, applicable to a Wideband Code Division Multiple Access (WCDMA) network, at least comprising:a transmitting terminal, for transmitting data in the form of packets with a predetermined first data message pdu; anda receiving terminal, for establishing a connection with the transmitting terminal, receiving the data according to the first data message pdu transmitted from the transmitting terminal, and calculating a bit error rate (ber) or a Block Error Rate (BER) of the first data message pdu;wherein the receiving terminal recalculates a second data message pdu length The data transmission system as claimed in claim 1, wherein the connection is an Acknowledged Mode Radio Link Control .

The data transmission system as claimed in claim 1, at least comprising the following three pdu formats:a data message pdu, transmitted from the transmitting terminal to the receiving terminal, for carrying data required for being transmitted by an upper layer;a data acknowledgement message pdu, transmitted from the receiving terminal to the transmitting terminal, for providing information about a receiving sate of the data message pdu; anda data message length change requirement pdu, transmitted from the receiving terminal to the transmitting terminal, for informing the transmitting terminal to adjust the length of the data message pdu, wherein:the first data message pdu, the second data message pdu, and the third data message pdu belong to the data message pdu; andthe pdu change request belongs to the data message length change requirement pdu.

A data transmission method for dynamically adjusting a protocol data unit (pdu) length, applicable to a Wideband Code Division Multiple Access (WCDMA) network at least comprising a transmitting terminal and a receiving terminal, the data transmission method comprising:(A) establishing a connection between the transmitting terminal and the receiving terminal;(B) the transmitting terminal transmitting data to the receiving terminal with a first data message pdu;(C) the receiving terminal or the transmitting terminal providing a pdu change request; and(D) the receiving terminal using the pdu change request to recalculate a second data message pdu, or the transmitting terminal using the pdu change request to recalculate a third data message pdu to continuously transmit data.

according to the ber or the BER, and provides a pdu change request to request the transmitting terminal to continuously transmit data with the second data message pdu length;wherein the transmitting terminal The data transmission system as claimed in claim 1, wherein the BER is calculated through the following equation:BER=(1-(1-ber)pdu length).

calculates an appropriate third data message pdu length according to a retransmission rate for retransmitting the first data message pdu and the ber or the BER, and requests the receiving terminal to continuously transmit data with the third data message pdu length through the pdu change request.

by: alina

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