In a TDD (Time Division Duplexing) system, information is sent and received by using different time slots of a same frequency carrier. With regard to a frame structure of the TDD system, FIG. 1 may be referred to, in which each radio frame has a frame length of 10 ms and includes ten subframes each of which has a length of 1 ms, and each half radio frame has a frame length of 5 ms.
In the TDD system, an uplink-downlink configuration may be semi-statically adjusted according to different types of services, so as to meet a service requirement of asymmetrical uplink-downlink. In a 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) TDD system, as shown in Table 1, there are seven kinds of uplink-downlink configurations in total, where ‘D’ represents a downlink subframe, ‘U’ represents an uplink subframe and ‘S’ represents a special subframe. Since the special subframe includes a DwPTS, the special subframe can be used for downlink
TABLE 1Uplink-downlink configurations in a TDD systemuplink-downlinksubframe serial number in aconfigurationrepeatradio frameserial numberperiod012345678905 msDSUUUDSUUU15 msDSUUDDSUUD25 msDSUDDDSUDD310 ms DSUUUDDDDD410 ms DSUUDDDDDD510 ms DSUDDDDDDD65 msDSUUUDSUUD
In a LTE system, which uplink-downlink configuration to be used is configured semi-statically by a base station, so it will occur that a configured uplink-downlink configuration does not match an instantaneous service type, and thus resources cannot be used efficiently, which is especially serious in a cell with a relatively small number of users. In order to solve this problem, a technology of applying a dynamic TDD subframe may be introduced to the LTE R11 Version, namely that several dynamic subframes, which are able to not only be used as uplink subframes but also be used as downlink subframes, are configured in a radio frame. Table 2 illustrates a schematic diagram of applying a dynamic TDD subframe in a radio frame, that is, the last two subframes of each half radio frame are dynamic subframes, wherein ‘F’ represents a dynamic subframe. In addition, subframes with subframe numbers 0, 1, 5 and 6 in a radio frame are all used for downlink, namely downlink subframes, and these four subframes may also be referred to as fixed downlink subframes. Subframes with subframe numbers 2 and 7 in a radio frame are both uplink subframes, and these two subframes may also be referred to as fixed uplink subframes.
TABLE 2Subframe number in a radio frame0123456789DSUFFDSUFF
However, in a scenario of applying the dynamic TDD subframe, the related art does not solve a problem how to determine whether a dynamic subframe is an uplink subframe or a downlink subframe, thus an information transmission in the scenario of applying the dynamic TDD subframe can not be implemented.