Transmission scheduling method and device under sleeping mode

Abstract

The embodiment of the invention discloses a transmission scheduling method and device under a sleeping mode. The method comprises the following steps of: at a monitoring state under the sleeping mode, calculating a first transmission time period needed by transmitting all data packets to be transmitted in a current period buffer; judging whether the first transmission time period is greater than a monitoring window time period regulated by a protocol or not; if so, calculating a second transmission time period needed by that the waiting time for transmission exceeds a data packet to be transmitted of a time delay limiting value when all monitoring windows of the next period in the current period buffer arrive; adjusting the monitoring window time period regulated by the protocol into the second transmission time period; transmitting the data packet to be transmitted, which exceeds the time delay limiting valve, in the second transmission time period; and putting the data packet to be transmitted, which does not exceed the time delay limiting valve, into the buffer of the next period. According to the embodiment of the invention, the energy-saving efficiency of a mobile terminal can be improved; and data loss is avoided.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a transmission scheduling method and device in sleep mode. Background technique [0002] The sudden transmission of a large amount of high-rate data will cause the mobile terminal to be in an idle state for a certain period of time, which in turn will cause unnecessary power consumption of the mobile terminal. In order to save the power of the mobile terminal, the IEEE 802.16e standard defines a power saving mechanism: the working mode of the mobile terminal is divided into a sleep mode and a normal working mode. In the sleep mode, the sleep window and the listening window appear alternately periodically. During the time period corresponding to the sleep window, the base station will not transmit any data to the mobile terminal. The mobile terminal can turn off one or more hardware devices during this time period. Therefore, the power consumption is minimi...

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Problems solved by technology

[0004] In the process of realizing the present invention, the inventors of the present invention have found that there are at least the following problems in the prior art: in saving class II, the duration T of the sleep window S and the duration of the listening window T L It is fixed. For the USG with a constant transmission data rate, the fixed window mechanism can achieve power saving. For the RT-VR with variable transmission data rate, the fixed window mechanism will reduce the energy saving of the mobile terminal. efficiency, while also potentially causing data loss

For example, see figure 2 The schematic diagram of the transmission scheduling in the sleep mode in the energy-saving class II of the prior art is shown, wherein, in the period 1 in the sleep mode, since the listening window is limited by a fixed duration, the mobile terminal cannot use the listening window in the current period. The data packets of the three real-time service connections in this cycle are all sent. Assuming that the data packet S3 is not sent in the monitoring window of cycle 1, it can only be sent when the monitoring window of cycle 2 arrives.

Before the listening window of period 2 arrives, the waiting time of data packet S3 may have exceeded the limit value of its transmission delay, forcing the mobile terminal to exit the sleep mode, and then there will be mode switching signaling overhead between the terminal and the base station , reduce the energy-saving efficiency of the mobile terminal, and at the same time, it may also cause the loss of the data packet S3 due to the overflow of the buffer

In addition, in cycle 3 in sleep mode, if the number of real-time connection data packets in this cycle is too small, idle frames will appear on the listening window, resulting in unnecessary waste of resources

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