Pdu Zero

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selecting a pdu length corresponding to the maximum value as the pdu length of the maximum bandwidth utilization, wherein the bandwidth utilization is calculated through the following equation:Bandwidth utilization=(1-ber)pdu length(pdu length-pdu header)/pdu length.

The computer-readable recording medium as claimed in claim 16, wherein Step (D) further comprises:the transmitting terminal setting the length of the second data message pdu according to the received pdu change request, and setting a data length reset bit of the second data message pdu as 1 when transmitting the second data message pdu for the first time; andthe receiving terminal changing the used pdu length when receiving the second data message pdu with the data length reset bit as 1. WCDMA is mainly applied in Universal Mobile Telecommunication System (UMTS) and 3G system in Japan. This technology makes the 3G mobile communication be optimized, and makes the 2 GHz frequency band be sufficiently used.

The data communication function of the WCDMA is similar to that of a computer network, and the WCDMA is generally divided into four layers, namely, a physical layer, a transport network layer, a radio network layer, and a system network layer. When the data needs to be transmitted, the data is divided into a plurality of data packets with a certain length, and once the connection is established, the data packets are transmitted. If the data packets are seriously lost, the physical layer adjusts the transmission power or the spread factor through power control, so as to reduce the bit error rate (ber) and reduce the block error rate, thereby increasing the effective data transmission and reducing the packet loss rate.

However, when an error occurs to most of the data packets, adjusting the transmission power or the spread factor requires enhancing the transmission power and thereby increasing the power consumption, which causes signal interference between users, indirectly influences the transmission quality, such that the overall packet loss rate is increased.

The computer-readable recording medium as claimed in claim 16, further comprising:when the transmitting terminal found that an average error rate or a retransmission request rate of the first data message pdu is changed, calculating an appropriate pdu length as a length of a third data message pdu according to the ber fed back by the receiving terminal, and transmitting data with the third data message pdu;wherein when transmitting the third data message pdu for the first time, the transmitting terminal sets a data length reset bit of the third data message pdu as 1.

The computer-readable recording medium as claimed in claim 24, wherein:the first data message pdu, the second data message pdu, and the third data message pdu belong to a data message pdu, and the data message pdu is transmitted from the transmitting terminal to the receiving terminal, for carrying data required for being transmitted by an upper layer; andthe pdu change request is a data message length change requirement pdu, for informing the transmitting terminal or the receiving terminal to adjust the data transmission message pdu.

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