Packet relay method and device

摘要

Feedback information including a transmission quality of a packet transmitted from a transmitting device to a receiving device is received from the receiving device and the transmission quality included in the feedback information is revised down, to be transferred to the transmitting device, based on information of resource consumed for maintaining a wireless link included in a path to the receiving device. The above revising down is executed if it is found that the information of resource consumed reaches a predetermined threshold or is not executed unless it is found otherwise. The information of resource includes, for example, the number of retransmission times of a packet for a predetermined period of time, a transmission power level or a code length of an error correcting code.

主权项

1. A packet relay method in a relay device, comprising:
receiving, by the relay device, feedback information from a receiving device, the feedback information including quality information indicating a transmission quality of a packet transmitted from a transmitting device to the receiving device, the quality information being used by the transmitting device for controlling a data transfer rate; and revising down, by the relay device, the quality information included in the received feedback information to be transferred to the transmitting device based on control information, the control information indicating a degree of an increase in the transmission quality caused by a control executed by the relay device for maintaining the transmission quality, and transmitting, by the relay device, the feedback information including the revised quality information to the transmitting device; wherein the degree of the increase in the transmission quality comprises a number of retransmission times of a packet for a predetermined period of time, and the quality information is revised down by adding a value, which is obtained by subtracting a threshold from a discarded packet number corresponding to the number of retransmission times of the packet to the receiving device, or a value, which is obtained by subtracting the threshold from a packet discard rate indicating a value obtained by dividing the discarded packet number by a number of transmission times of a packet, respectively to a discarded packet number or a packet discard rate as the transmission quality indicated by the quality information included in the received feedback information.