CN102447538B - Downlink control information transmission method and system - Google Patents

Abstract

The present invention relates to a kind of downlink control information transmission method and system, this method includes：The lateral user equipment of network issues at least two Downlink Control Information relevant with intended service data, wherein carrying the configured information of the intended service data transmission time intervals (TTI)；The user equipment receives and parses through the Downlink Control Information.Downlink control information transmission method of the present invention and system add the probability that user equipment is properly received Downlink Control Information, improve the covering performance of down control channel.

Description

Downlink control information transmission method and system

technical field

The present invention relates to the field of wireless communication, in particular to a downlink control information transmission method and system of a long-term evolution system (LTE).

Background technique

The Universal Mobile Telecommunications System (UMTS) terrestrial wireless access and Long Term Evolution (LTE) of the wireless access network belong to the Fourth Generation (4G) wireless broadband technology. The LTE system can provide high peak data rate (downlink 100Mps, uplink 50Mps), low delay (loopback delay 10ms), improved system capacity and coverage, and reduced operating costs; in addition, it also supports multiple antennas, efficient Packet data transmission, flexible bandwidth operation (up to 20MHz) and seamless integration with existing systems. This necessitates an efficient and reliable control channel design. Specifically, the downlink (Downlink, DL for short) control signaling includes a scheduling grant, a control format indication, and a Hybrid Automatic Repeat-ReQuest (HARQ for short) confirmation.

The LTE system is based on Orthogonal Frequency Division Multi-plexing (OFDM), each downlink frame lasts 10 ms, includes 10 subframes, each subframe includes two time slots, and each time slot includes 6 or 7 OFDM symbols. The downlink control signaling is located in the first n (less than or equal to 3) OFDM symbols of each subframe. The downlink control signaling is carried by the following three physical channels: Physical Control Format Indicator Channel (Physical Control Format Indicator Channel, referred to as PCFICH), which is used to indicate the number of OFDM symbols used for control in the subframe (that is, the n value); physical HARQ The indicator channel (Physical HARQ Indicator Channel, referred to as PHICH), carries the downlink positive/negative acknowledgment (Acknowledgment/Negative Acknowledge, referred to as ACK/NACK) related to uplink data transmission; the physical downlink control channel (Physical Downlink Control Channel, referred to as PDCCH), Bearer of downlink scheduling assignment and uplink scheduling grant. There are multiple PDCCHs per subframe, and user equipment (User Equipment, UE for short) may be allocated one or multiple PDCCHs if scheduled. Among them, the smallest unit of PDCCH transmission is a control channel element (ControlChannel Element, referred to as CCE), a PDCCH contains one or more CCEs, each CCE contains 9 Resource Element Groups (Resource Element Group, referred to as REG), each REG contains 4 Non-pilot resource elements or subcarriers. Quadrature Phase Shift Keying (Quadrature Phase Shift Keying, QPSK for short) is always used for the PDCCH, therefore, one CCE includes 72 coded bits. Each PDCCH carries information related to one or more UEs with different payload sizes, and may use different control formats for transmission. The UE monitors different PDCCH formats in real time through blind detection, and detects the PDCCH related to itself.

Regarding the coverage of the LTE downlink control channel, the existing simulation results show that the PHICH has the best coverage performance, followed by the PCFICH, and finally the PDCCH, that is, the coverage of the LTE downlink control channel is limited by the PDCCH. Similarly, other existing wireless communication systems also have the problem of limited coverage of specific downlink control channels.

Contents of the invention

The technical problem to be solved by the present invention is to provide a downlink control information transmission method and system to solve the problem of limited coverage of downlink control channels.

In order to solve the above technical problems, the present invention provides a downlink control information transmission method, the method comprising:

The network side sends at least two pieces of downlink control information related to the scheduled service data to the user equipment, which carries the indication information of the scheduled service data transmission time interval (TTI);

The user equipment receives and parses the downlink control information.

Further, after the network side delivers the downlink control information to the user equipment, the method further includes: the network side delivers the predetermined service data to the user equipment or receives the predetermined service data from the user equipment according to the downlink control information.

Further, after the user equipment successfully receives and parses at least one piece of the downlink control information, the method further includes: receiving or sending the predetermined service data from the network side or to the network side according to the downlink control information.

Optionally, the downlink control information is sent through a physical downlink control channel (PDCCH).

Optionally, the indication information is an absolute position or a relative position of the transmission time interval.

Further, the network side sends the downlink control information at the transmission time interval of sending the predetermined service data and/or at the previous transmission time interval.

The indication information is represented by one bit, where "1" indicates that the scheduled service data will be delivered at the next transmission time interval, and "0" indicates that the scheduled service data will be delivered at the current transmission time interval; or,

The indication information is represented by two bits, where "10" indicates that the scheduled service data will be delivered at the second transmission time after that, "01" indicates that the scheduled service data will be delivered at the next transmission time interval, and "00" Indicates that the scheduled service data is delivered at the current transmission time interval.

Preferably, the network side sends the downlink control information when it judges that any of the following conditions is satisfied:

The broadband channel quality indicator (CQI) fed back by the user equipment is smaller than the broadband channel quality indicator threshold; or,

No signal is detected on the uplink HARQ feedback channel corresponding to the downlink service data; or,

No signal can be detected on the upstream traffic channel.

In order to solve the above technical problems, the present invention also provides a downlink control information transmission system, which includes:

A downlink control information sending module on the network side, configured to send at least two pieces of downlink control information related to scheduled service data to the user equipment, which carries indication information of the scheduled service data transmission time interval (TTI);

The control information receiving and analyzing module of the user equipment is configured to receive and analyze the downlink control information.

Further, the indication information is the absolute position or relative position of the transmission time interval, and the downlink control information sending module on the network side sends the transmission time interval and/or the previous transmission time interval of the predetermined service data. downlink control information.

Preferably, the indication information is represented by one bit, wherein "1" indicates that the scheduled service data will be delivered at the next transmission time interval, and "0" indicates that the scheduled service data will be delivered at the current transmission time interval; or,

The indication information is represented by two bits, where "10" indicates that the scheduled service data will be delivered at the second transmission time after that, "01" indicates that the scheduled service data will be delivered at the next transmission time interval, and "00" Indicates that the scheduled service data is delivered at the current transmission time interval.

Preferably, the downlink control information sending module on the network side sends the downlink control information when it judges that any of the following conditions is met:

The broadband channel quality indicator (CQI) fed back by the user equipment is smaller than the broadband channel quality indicator threshold; or,

No signal is detected on the uplink HARQ feedback channel corresponding to the downlink service data; or,

No signal can be detected on the upstream traffic channel.

The present invention increases the probability that the user equipment (UE) successfully receives the downlink control information related to the predetermined service data by sending at least two downlink control information related to the predetermined service data within one or more TTI ranges, thereby further The coverage performance of the downlink control channel is greatly improved, and the coverage balance of different downlink control channels is finally realized.

Description of drawings

FIG. 1 is a schematic diagram of a downlink control information transmission method of the present invention;

Figure 2 is a schematic diagram of two PDCCHs being sent in the same TTI;

FIG. 3 is a schematic diagram of two PDCCHs being sent in different TTIs;

FIG. 4 is a schematic diagram of three PDCCHs being sent in different TTIs;

FIG. 5 is a schematic diagram of a PDCCH being sent in a specific TTI;

Fig. 6 is a schematic diagram of the downlink control information transmission system of the present invention.

detailed description

As shown in Figure 1, the downlink control information transmission method of the present invention includes:

Step 101: The network side sends at least two pieces of downlink control information related to predetermined service data to the user equipment, which carry indication information of the transmission time interval (Transmission Time Internal, TTI for short) of the predetermined service data.

The conditions for the network side to issue the downlink control information to the user equipment include:

The broadband channel quality indicator (CQI) fed back by the user equipment is less than the broadband channel quality indicator threshold; or, no signal can be detected on the uplink HARQ feedback channel corresponding to the downlink service data; or, no signal can be detected on the uplink service channel. Signal.

The indication information includes the absolute position of the TTI (such as the index of the TTI) or the relative position (such as the interval number of the TTI for sending the predetermined service data and downlink control information).

The TTI of the downlink control information issued by the network side to the user equipment does not exceed the TTI of the predetermined service data, specifically, the network side sends the TTI of the predetermined service data and/or the previous TTI The downlink control information. Understandably, the downlink control information and the predetermined service data are in the same or different TTI.

Understandably, if the TTI indication information of the scheduled service data uses the relative position of the TTI to indicate the TTI of the scheduled service data, then two or more downlink control information related to the scheduled service data in the same TTI bear The downlink control signaling (including the indication information of the predetermined service data TTI) is the same; two or more downlink control information related to the predetermined service data are in different TTIs, and the indication information of the predetermined service data TTI carried is different The same, and the other downlink control signaling carried is the same.

After the network side delivers the downlink control information to the user equipment, the method further includes: the network side delivers the predetermined service data to the user equipment or receives the predetermined service data from the user equipment according to the downlink control information.

Preferably, the downlink control information is sent through a physical channel carrying downlink control signaling (such as a physical downlink control channel (PDCCH) of the LTE system).

Step 102: the user equipment receives and parses the downlink control information.

After the user equipment successfully receives and parses at least one piece of the downlink control information, the method further includes: receiving or sending the predetermined service data from the network side or to the network side according to the downlink control information.

The present invention increases the probability that the user equipment (UE) successfully receives the downlink control information related to the predetermined service data by sending at least two downlink control information related to the predetermined service data within one or more TTI ranges, thereby further The coverage performance of the downlink control channel is greatly improved, and the coverage balance of different downlink control channels is finally realized.

Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

Take the PDCCH channel of the LTE system as an example. Note that in the following embodiments, the PDCCH payload is equivalent to downlink control information.

Table 1 is an example of the payload of the downlink control signaling delivered through the PDCCH, specifically the LTE downlink control information (Downlink Control Information, DCI for short) format 1a, as shown in Table 1.

Table 1 DCI format 1a

carrier indication Indicates the component carrier carrying service data Format 0/Format 1a distinguishing flag - virtual resource block allocation flag Indicates centralized or distributed resource allocation resource block allocation Indicates the allocated logical resource location modulation coding scheme Indicates the modulation method and coding rate HARQ process number - new data indicator Indicates that business data is new data or retransmitted data redundant version Indicates the location of the first or retransmitted data within the entire encoded data PUCCH power control command - Sounding Reference Signal Request - Scheduled service data TTI indication information Indicates the location of the TTI where the scheduled service data is located

In the above table, PUCCH is the abbreviation of Physical Uplink Control Channel (Physical Uplink Control Channel).

Embodiment one

Assume that the serving base station of UE1 is B1, currently B1 transmits service data for UE1, UE1 feeds back the wideband channel quality indicator (Channel Quality Indicator, referred to as CQI) information to B1, and B1 knows the predetermined wideband channel quality indicator threshold (denoted as Thresh _CQI ) . Specifically, the wideband channel quality indication includes a Signal to Interference and Noise Ratio (SINR for short) indication, a Modulation Coding Scheme (MCS for short) indication, and indications of other parameters that can be converted into SINR.

In this embodiment, it is considered temporarily that the CQI is equivalent to the SINR indication.

Specifically, assuming that the CQI fed back by UE1 is denoted as CQI _UE1 , and base station B1 judges that CQI _UE1 is smaller than the threshold Thresh _CQI value, the PDCCH transmission method as shown in FIG. 2 or 3 is adopted. Specifically, as shown in FIG. 2, within the second TTI range, two PDCCHs related to UE1 service data are sent, and the payloads of the two PDCCHs sent are exactly the same, wherein the two sent The user equipment service data TTI indication information of the PDCCH payload contains 1 bit, and all of them are set to "0", indicating that the current TTI contains service data related to UE1; when UE1 successfully receives and parses at least one of the When using the above PDCCH, UE1 can correctly acquire and detect the downlink service data related to it, or send the uplink service data related to it. Specifically, as shown in FIG. 3 , one PDCCH related to UE1 service data is sent in the second and third TTI ranges respectively, that is, the PDCCH related to UE1 service data is in the range of two consecutive TTIs. Two are sent, and the payloads of the two PDCCHs sent are identical except for the indication information of the user equipment service data TTI, wherein the indication information of the user equipment service data TTI contains 1 bit, and The indication information of the user equipment service data TTI of the PDCCH payload within the range of the second TTI is set to "1", indicating that the next TTI contains service data related to UE1, and the current TTI does not contain service data related to UE1 Service data, the indication information of the user equipment service data TTI of the PDCCH payload within the third TTI range, is set to "0", indicating that the current TTI contains service data related to UE1; when UE1 at least successfully receives and parses the When one of the PDCCHs is used, UE1 can correctly acquire and detect the downlink service data related to it or send the uplink service data related to it.

In addition, the PDCCH related to the service data of UE1 is not limited to be sent at most twice, and the indication information of user equipment service data TTI in its payload is not limited to 1 bit length. For example, as shown in Figure 4, one PDCCH related to UE1's business data is sent in the first, second, and third TTI respectively, that is, the PDCCH related to UE1's business data is in the range of three consecutive TTIs Three are sent, and the payloads of the three PDCCHs sent are identical except for the indication information of the user equipment service data TTI, wherein the indication information of the user equipment service data TTI contains 2 bits, and in the The user equipment service data TTI indication information of the PDCCH payload within the range of 1 TTI is set to "10", indicating that the subsequent second or third TTI contains service data related to UE1, and the current TTI does not contain service data related to UE1. For service data related to UE1, the indication information of the user equipment service data TTI of the PDCCH payload within the range of the second TTI is set to "01", indicating that the subsequent first or third TTI contains services related to UE1 Data, the current TTI does not contain service data related to UE1, and the indication information of the user equipment service data TTI of the PDCCH payload within the range of the third TTI is set to "00", indicating that the current TTI contains service data related to UE1 ; When UE1 successfully receives and parses at least one of the PDCCHs, UE1 can correctly acquire and detect downlink service data related to it or send uplink service data related to it.

Embodiment two

Assume that the serving base station of UE1 is B1, currently B1 transmits service data for UE1, UE1 feeds back the wideband channel quality indicator (Channel Quality Indicator, referred to as CQI) information to B1, and B1 knows the predetermined wideband channel quality indicator threshold (denoted as Thresh _CQI ) . Specifically, the wideband channel quality indication includes a Signal to Interference and Noise Ratio (SINR for short) indication, a Modulation Coding Scheme (MCS for short) indication, and indications of other parameters that can be converted into SINR.

In this embodiment, it is considered temporarily that the CQI is equivalent to the SINR indication.

Specifically, assuming that the CQI fed back by UE1 is denoted as CQI _UE1 , and base station B1 judges that CQI _UE1 is not less than the threshold Thresh _CQI value, the PDCCH transmission method as shown in FIG. 5 is adopted. Specifically, as shown in FIG. 5, within the range of the second TTI, a PDCCH related to UE1 service data is sent, wherein, the user equipment service data TTI of the payload of the PDCCH related to UE1 service data The indication information only contains 1 bit and is set to "0", indicating that the current TTI contains service data related to UE1; when UE1 successfully receives and parses the unique PDCCH, UE1 can correctly obtain and detect its related downlink services data or send uplink service data related to it. In addition, the indication information of the user equipment service data TTI of the PDCCH payload is not limited to a length of 1 bit. Specifically, the user equipment service data TTI indication information of the payload of the PDCCH contains 2 bits and is set to "00", indicating that the current TTI contains service data related to UE1; when UE1 successfully receives and parses the unique PDCCH , UE1 can correctly acquire and detect the downlink service data related to it or send the uplink service data related to it.

In this embodiment, it is temporarily assumed that UE1 fails to detect the unique PDCCH.

At this time, UE1 cannot correctly obtain and detect the downlink service data related to it, so that it will not feed back any information on the uplink HARQ feedback channel (PUCCH) corresponding to the downlink service data, causing base station B1 to be on the HARQ feedback channel. No signal can be detected; or UE1 cannot send its related uplink service data, so base station B1 cannot detect any signal on the related uplink service channel. Next, base station B1 adopts the PDCCH transmission method as shown in FIG. 2 or 3 .

Specifically, as shown in FIG. 2, within the second TTI range, two PDCCHs related to UE1 service data are sent, and the payloads of the two PDCCHs sent are exactly the same, wherein the two sent The user equipment service data TTI indication information of the PDCCH payload contains 1 bit, and all of them are set to "0", indicating that the current TTI contains service data related to UE1; when UE1 successfully receives and parses at least one of the When using the above PDCCH, UE1 can correctly acquire and detect the downlink service data related to it, or send the uplink service data related to it. Specifically, as shown in FIG. 3 , one PDCCH related to UE1 service data is sent in the second and third TTI ranges respectively, that is, the PDCCH related to UE1 service data is sent in two consecutive TTI ranges. Two are sent, and the payloads of the two PDCCHs sent are identical except for the indication information of the user equipment service data TTI, wherein the indication information of the user equipment service data TTI contains 1 bit, and The user equipment service data TTI indication information of the PDCCH payload within the second TTI range is set to "1", indicating that the next TTI contains service data related to UE1, and the current TTI does not contain service data related to UE1. Service data, the indication information of the user equipment service data TTI of the PDCCH payload within the third TTI range, is set to "0", indicating that the current TTI contains service data related to UE1; when UE1 at least successfully receives and parses the When one of the PDCCHs is used, UE1 can correctly acquire and detect downlink service data related to it or send uplink service data related to it.

In addition, the PDCCH related to the service data of UE1 is not limited to be sent at most twice, and the indication information of user equipment service data TTI in its payload is not limited to 1 bit length. For example, as shown in Figure 4, one PDCCH related to UE1's business data is sent in the first, second, and third TTI respectively, that is, the PDCCH related to UE1's business data is in the range of three consecutive TTIs Three are sent, and the payloads of the three PDCCHs sent are identical except for the indication information of the user equipment service data TTI, wherein the indication information of the user equipment service data TTI contains 2 bits, and in the The user equipment service data TTI indication information of the PDCCH payload within the range of 1 TTI is set to "10", indicating that the subsequent second or third TTI contains service data related to UE1, and the current TTI does not contain service data related to UE1. For service data related to UE1, the indication information of the user equipment service data TTI of the PDCCH payload within the range of the second TTI is set to "01", indicating that the subsequent first or third TTI contains services related to UE1 Data, the current TTI does not contain service data related to UE1, and the indication information of the user equipment service data TTI of the PDCCH payload within the range of the third TTI is set to "00", indicating that the current TTI contains service data related to UE1 ; When UE1 successfully receives and parses at least one of the PDCCHs, UE1 can correctly acquire and detect downlink service data related to it or send uplink service data related to it.

Note: 1) If the indication information of the user equipment service data TTI of the PDCCH payload only contains 1 bit, then at most two PDCCH transmissions related to predetermined service data at different TTIs are supported; if the PDCCH payload If the user equipment service data TTI indication information contains 2 bits, then at most four PDCCH transmissions related to predetermined service data and located in different TTIs are supported; and so on. 2) The PDCCH resources shown in Figures 2 to 5 are actually logical resources (CCE), that is, the corresponding physical resources (REG) may not be continuous.

In summary, the present invention provides a downlink control information transmission method that is simple to implement and has better performance. This method transmits at least two downlink control information related to predetermined service data within one or more TTI ranges, increasing The probability that the user equipment (UE) successfully receives the downlink control information related to the predetermined service data is improved, thereby further improving the coverage performance of the downlink control channel, and finally realizing the coverage balance of different downlink control channels.

Corresponding to the foregoing method, the present invention also provides an embodiment of a downlink control information transmission system, as shown in FIG. 6, the system includes:

A downlink control information sending module on the network side, configured to send at least two pieces of downlink control information related to predetermined service data to the user equipment, wherein the predetermined service data TTI indication information is carried;

The control information receiving and analyzing module of the user equipment is used to receive and analyze the downlink control information;

Further, the downlink control information is sent through a physical downlink control channel.

Optionally, the system further includes a service data transceiving module on the network side, configured to send or receive the predetermined service data to or from the user equipment according to the downlink control information.

Optionally, the system further includes a service data transceiving module of the user equipment, and the user equipment receives or sends the predetermined service data from the network side or to the network side according to the downlink control information.

Understandably, the above network side downlink control information sending module, user equipment control information receiving and analyzing module, network side service data sending module, user equipment service data receiving module, user equipment service data sending module and the network side The business data receiving module constitutes another embodiment of the downlink control information transmission system of the present invention.

Optionally, the indication information is an absolute position or a relative position of the transmission time interval.

The downlink control information sending module on the network side sends the downlink control information at the transmission time interval for sending the predetermined service data and/or at the previous transmission time interval.

The downlink control information sending module on the network side sends the downlink control information when it judges that any of the following conditions is met:

The broadband channel quality indicator (CQI) fed back by the user equipment is smaller than the broadband channel quality indicator threshold; or,

No signal is detected on the uplink HARQ feedback channel corresponding to the downlink service data; or,

No signal can be detected on the upstream traffic channel.

The indication information is represented by one bit, where "1" indicates that the scheduled service data will be delivered at the next transmission time interval, and "0" indicates that the scheduled service data will be delivered at the current transmission time interval; or,

The indication information is represented by two bits, where "10" indicates that the scheduled service data will be delivered at the second transmission time after that, "01" indicates that the scheduled service data will be delivered at the next transmission time interval, and "00" Indicates that the scheduled service data is delivered at the current transmission time interval.

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding changes All changes and modifications should belong to the scope of protection of the appended claims of the present invention.

Those skilled in the art can understand that all or part of the steps in the above method can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium, such as a read-only memory, a magnetic disk or an optical disk, and the like. Optionally, all or part of the steps in the foregoing embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module in the foregoing embodiments may be implemented in the form of hardware, or may be implemented in the form of software function modules. The present invention is not limited to any specific combination of hardware and software.

Claims (12)

1. A downlink control information transmission method, characterized in that the method comprises: The network side sends at least two pieces of downlink control information related to the scheduled service data to the user equipment, which carry the indication information of the scheduled service data transmission time interval TTI; two or more information related to the scheduled service data in different TTI Downlink control information, the indication information of the predetermined service data TTI carried is different, and the other downlink control signaling carried is the same; The user equipment receives and parses the downlink control information; Wherein, the receiving and parsing of the downlink control information by the user equipment specifically includes: the user equipment successfully receives and parses one piece of downlink control information. 2. The method according to claim 1, wherein after the network side delivers the downlink control information to the user equipment, the method further comprises: the network side delivers the downlink control information to the user equipment according to the downlink control information. sending or receiving the predetermined service data from the user equipment. 3. The method according to claim 1, characterized in that, after the user equipment successfully receives and parses a piece of downlink control information, it further comprises: according to the downlink control information, receiving or sending the downlink control information from the network side The scheduled business data. 4. The method according to claim 1, wherein the downlink control information is sent through a physical downlink control channel (PDCCH). 5. The method according to claim 1, wherein the indication information is an absolute position or a relative position of a transmission time interval. 6. The method according to claim 1, wherein the network side delivers the downlink control information at a transmission time interval and/or a previous transmission time interval for sending the predetermined service data. 7. The method according to any one of claims 1 to 6, characterized in that: The indication information is represented by one bit, where "1" indicates that the scheduled service data will be delivered at the next transmission time interval, and "0" indicates that the scheduled service data will be delivered at the current transmission time interval; or, The indication information is represented by two bits, where "10" indicates that the scheduled service data will be delivered at the second transmission time after that, "01" indicates that the scheduled service data will be delivered at the next transmission time interval, and "00" Indicates that the scheduled service data is delivered at the current transmission time interval. 8. The method according to any one of claims 1 to 6, wherein the network side issues the downlink control information when it judges that any of the following conditions is met: The broadband channel quality indicator CQI fed back by the user equipment is smaller than the broadband channel quality indicator threshold; or, No signal is detected on the uplink HARQ feedback channel corresponding to the downlink service data; or, No signal can be detected on the upstream traffic channel. 9. A downlink control information transmission system, characterized in that the system comprises: The downlink control information sending module on the network side is configured to send at least two pieces of downlink control information related to predetermined service data to the user equipment, which carry indication information of the predetermined service data transmission time interval TTI; two or more For the downlink control information related to the scheduled service data in different TTIs, the TTI indication information of the scheduled service data carried is different, and the other downlink control signaling carried is the same; The control information receiving and analyzing module of the user equipment is used to receive and analyze the downlink control information; Wherein, the receiving and parsing the downlink control information specifically includes: the user equipment successfully receives and parses one piece of the downlink control information. 10. The system according to claim 9, characterized in that: the indication information is the absolute position or relative position of the transmission time interval, and the downlink control information sending module on the network side, when sending the transmission of the predetermined service data Send the downlink control information at the time interval and/or the previous transmission time interval. 11. A system as claimed in any one of claims 9 to 10, characterized in that: The indication information is represented by one bit, where "1" indicates that the scheduled service data will be delivered at the next transmission time interval, and "0" indicates that the scheduled service data will be delivered at the current transmission time interval; or, The indication information is represented by two bits, where "10" indicates that the scheduled service data will be delivered at the second transmission time after that, "01" indicates that the scheduled service data will be delivered at the next transmission time interval, and "00" Indicates that the scheduled service data is delivered at the current transmission time interval. 12. The system according to any one of claims 9 to 10, wherein the downlink control information sending module on the network side sends the downlink control information when it judges that any of the following conditions is met: The broadband channel quality indicator CQI fed back by the user equipment is smaller than the broadband channel quality indicator threshold; or, No signal is detected on the uplink HARQ feedback channel corresponding to the downlink service data; or, No signal can be detected on the upstream traffic channel.