Method and device used for transferring data speed control informaton
A technology for rate control and data transmission, which is applied in the direction of adjusting transmission rate, multiplexing communication, transmission modification based on link quality, etc., and can solve problems such as increasing reverse link interference load
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Embodiment 1
[0042] FIG. 3 shows the time slot transmission / reception relationship between the forward link and the reverse link in the DRC channel transmission control operation according to the first embodiment of the present invention. This embodiment is characterized in that a DRI (DRC Request Indicator) bit is introduced to control the DRC channel. Although the following embodiment is described for a data rate of 76.8 kbps, it is only one example application. Obviously, the first embodiment can be used for any data rate.
[0043] Referring to FIG. 3, the AN controls the transmission of the DRC channel from all ATs by informing all ATs whether it needs to receive the reverse DRC channel. AN sends information in DRI bits on the MAC channel. The DRI bit indicates whether DRC information is required for scheduling after a predetermined slot time period. When the transmission of forward packets is terminated at a predetermined slot time period, the DRC information is required and the AN...
Embodiment 2
[0058] FIG. 7 shows the relationship in slot transmission / reception between the forward link and the reverse link according to the second embodiment of the present invention. In the second embodiment, the transmission of the DRC channel is controlled by allowing the AT to search for the preambles of all ATs within the service area of the AN. According to the second embodiment, the AT determines the AT that communicates the packet data with the AN by detecting the preambles of all the ATs, and transmits the DRC information at a predetermined slot time period before the packet data is completely transmitted.
[0059] If each AT also searches the preambles of other ATs, it can find the length of the current forward packet. Thus, the AT does not send its DRC channel until scheduling is required. That is, each AT checks whether its DRC channel is to be sent, and as a result, it sends a DRC channel only when scheduled. In this way the transmission of the DRC channel is controlle...
Embodiment 3
[0067] FIG. 10 shows the relationship in slot transmission / reception between the forward link and the reverse link in the DRC channel transmission control operation according to the third embodiment of the present invention. In this embodiment, the DRC channel of the AT receiving the current forward channel is controlled.
[0068] Referring to FIG. 10, since only the DRC channel of the AT receiving the packet from the AN is controlled in the third embodiment of the present invention, compared with the second embodiment, a detector for detecting preambles of other ATs is not required. The AT assigned to the current forward traffic channel can detect the packet length and locate the start and end slots of the packet by searching the preamble of the incoming AT. The AT can also find a period of time where no DRC information is needed until the scheduled time before the packet is fully sent. As in the second embodiment, the DRC channel is sent in the first and last two slots of t...
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