Abstract:
The application provides a method for processing a downlink control channel, including: in a downlink Transmit Time Interval (TTI), when a User Equipment (UE) of a group call in a cell has an individual service to be scheduled, a sender schedules a service of the group call within public space, by using a Group Radio Network Temporary Identifier (G-RNTI), and schedules the individual service within dedicated space by using a Cell Radio Network Temporary Identifier (C-RNTI); in the downlink TTI, when no UE in the group call of the cell has an individual service to be scheduled, the sender schedules the service of the group call within the dedicated space by using the G-RNTI.

Description:
[0001]    The application claims the benefit of Chinese application No.201310642353.7, filed on Dec. 3, 2013, entitled “downlink control channel processing method, apparatus and system”, which is incorporated herein by reference in its entirety. 
       TECHNICAL FIELD 
       [0002]    The present disclosure relates to radio communication technologies, and more particularly, to a method, apparatus and system for processing downlink control channels. 
       BACKGROUND 
       [0003]    In a long term evolution (LTE) cluster system, in addition to Radio Network Temporary Identifier (RNTI) supported by the original LTE standard, Group Paging RNTI (GP-RNTI) and Group RNTI (G-RNTI) supporting cluster services have been added. GP-RNTI is used for paging of group users. G-RNTI is used for physical-layer scrambling of group signaling and services. 
         [0004]    Space occupied by RNTI-scrambling control commands on control channel elements (CCE) is divided into public space and dedicated space. The public space is shared by a number of public orders. The dedicated space can be shared by multiple users, and also can be used by one user. The public space starts from index  0  of fixed CCE space. A terminal searches in the dedicated space from a starting point determined by Cell RNTI (C-RNTI). 
         [0005]    The foregoing paging commands with GP-RNTI scrambling are generally stored in the public space, while the downlink group services commands with G-RNTI scrambling can be stored by the public space, or the dedicated space. When G-RNTI scrambling commands are stored in the public space with insufficient public resources, G-RNTI will occupy limited public space, thereby reducing system throughput. When G-RNTI is stored by the dedicated space with relatively sufficient resources, complexity of searching space by a user equipment (UE) may be increased, which puts forward a higher requirement for UE&#39;s battery capacity. 
         [0006]    To solve the above problems, applicant puts forward a method: allocate G-RNTI for cluster services within the dedicated space, and schedule the cluster service by using the G-RNTI; for a UE in a radio resource control_Connected (RRC_Connected) state of a cluster service group, when there are cluster service and UE individual service at the same time, firstly combine the cluster service with the UE individual service, then schedule the combined service by using C-RNTI of the UE; receiver: in a downlink transmit time interval (TTI), perform a blind detection within the dedicated space, by using a set of G-RNTIs or a set of C-RNTIs and G-RNTIs; the blind detection is terminated once detecting any RNTI. 
         [0007]    The applicant also puts forward another method: when there is a G-RNTI cluster service in a downlink TTI, schedule the cluster service by using the G-RNTI; for each UE of a cluster service group, if there is a UE individual service in the downlink TTI, not schedule the UE individual service within the TTI, and schedule the UE individual service in a next downlink TTI. In a downlink TTI, a UE performs a physical downlink control channel (PDCCH) blind detection within the dedicated space, by using a set of G-RNTIs or a set of C-RNTIs and G-RNTIs. 
         [0008]    By using the above two methods, although number of blind detection performed by a terminal can be significantly reduced, it is still necessary to perform additional 4 PDCCH blind detections at most. 
       SUMMARY 
       [0009]    The present disclosure puts forward a method for allocating a downlink control channel, including:
       under the circumstances that there is a service of group call to be scheduled in a downlink transmit time interval (TTI),   when a user equipment (UE) of the group call within a cell has an individual service to be scheduled in the downlink TTI,   scheduling, by a sender, the service of the group call in public space, by using a Group Radio Network Temporary Identifier (G-RNTI) or a Semi-Persistent Scheduling (SPS) G-RNTI, and scheduling the individual service of the UE within dedicated space, by using a Cell Radio Network Temporary Identifier (C-RNTI) or a SPS C-RNTI;   when each UE of the group call within the cell has no individual service to be scheduled in the downlink TTI, scheduling, by the sender, the service of the group call within the dedicated space, by using the G-RNTI or the SPS G-RNTI.       
 
         [0014]    The scheduling is a dynamic scheduling or the SPS. There is at least one service of the group call. There is at least one UE having the individual service to be scheduled in the downlink TTI. The individual service is a point-to-point service. The UE having the individual service to be scheduled in the downlink TTI is in a Radio Resource Control_Connected (RRC_Connected) state. 
         [0015]    The method further includes:
       before scheduling by the sender the service of the group call, determining whether there is a UE of the group call having an individual service to be scheduled in the downlink TTI;   wherein determining whether there is the UE of the group call having the individual service to be scheduled in the downlink TTI includes:   learning from a network side whether the UE having the individual service to be scheduled belongs to the group call; or,   learning from the network side the UE participating in the group call, monitoring the UE within the cell having the individual service to be scheduled, and determining whether the UE belongs to the group call.       
 
         [0020]    The present disclosure also provides an apparatus for processing a downlink control channel, including a first scheduling module and a second scheduling module,
       when there is a service of a group call to be scheduled in a downlink TTI, the first scheduling module is to schedule the service of the group call, which includes:   when a UE of the group call has an individual service to be scheduled in the downlink TTI, schedule the service of the group call within public space, by using a G-RNTI or a SPS G-RNTI;   when no UE of the group call has an individual service to be scheduled in the downlink TTI, schedule the service of the group call within dedicated space, by using the G-RNTI or the SPS G-RNTI;   when a UE of the group call has an individual service to be scheduled in the downlink TTI, the second scheduling module is to schedule the individual service of the UE within the dedicated space, by using a Cell Radio Network Temporary Identifier (C-RNTI) or a SPS C-RNTI.       
 
         [0025]    The apparatus further includes a service monitoring module, which is to monitor whether each UE of the group call in a cell has an individual service to be scheduled in the downlink TTI, inform the first scheduling module and the second scheduling module. 
         [0026]    The monitoring includes:
       learning from a network side whether the UE having the individual service to be scheduled belongs to the group call; or,   learning from the network side the UE participating in the group call, monitoring the UE of the cell having the individual service to be scheduled, and determining whether the UE belongs to the group call.       
 
         [0029]    The scheduling is a dynamic scheduling or a SPS. There is at least one service of the group call. There is at least one UE having the individual service to be scheduled in the downlink TTI. The individual service is a point-to-point service. 
         [0030]    The present disclosure also provides a method for processing a downlink control channel, including:
       performing, by a UE, a PDCCH blind detection within public space in a downlink TTI, by using a G-RNTI or a SPS G-RNTI;   when not detecting the G-RNTI and the SPS G-RNTI, continuously performing, by the UE, the PDCCH blind detection within dedicated space, and exiting the PDCCH blind detection.       
 
         [0033]    The method further includes:
       when detecting the G-RNTI or the SPS G-RNTI within the public space by the UE, and the UE is in a radio resource control_Idle (RRC_Idle) state, exiting the PDCCH blind detection.       
 
         [0035]    The method further includes:
       when detecting the G-RNTI or the SPS G-RNTI within the public space by the UE, and the UE is in an RRC_Idle state, continuously performing the PDCCH blind detection within the dedicated space, by using a C-RNTI or a SPS C-RNTI, and exiting the PDCCH blind detection.       
 
         [0037]    The present disclosure also provides a terminal for processing a downlink control channel, including a first module,
       wherein the first module is to perform a PDCCH blind detection within public space in a downlink TTI, by using a G-RNTI or a SPS G-RNTI;   when not detecting the G-RNTI and the SPS G-RNTI within the public space, continuously performing the PDCCH blind detection within dedicated space, and exiting the PDCCH blind detection.       
 
         [0040]    When detecting the G-RNTI or the SPS G-RNTI within the public space, and the terminal is in a RRC_Idle state, the first module is further to exit the PDCCH blind detection. 
         [0041]    The terminal further includes a second module;
       when detecting the G-RNTI or the SPS G-RNTI within the public space, and the terminal is in an RRC_Connected state, the second module is to perform the PDCCH blind detection within the dedicated space, by using a C-RNTI or a SPS C-RNTI, and exit the PDCCH blind detection.       
 
         [0043]    The terminal further includes a third module, which is to record whether the terminal is in an RRC_Connected state or RRC_Idle state. 
         [0044]    The present disclosure also provides a system for processing a downlink control channel. The system includes any of the apparatuses and the terminals described above. 
         [0045]    By adopting method, apparatus and system for processing a downlink control channel of the present disclosure, not only concurrent scheduling of multiple groups of cluster services is supported, but also gain of a cluster service system is improved. Meanwhile, it is not necessary for a UE to perform additional blind detections, thereby reducing searching complexity performed by the UE. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0046]      FIG. 1  is a flow chart illustrating a processing method performed by a sender, in accordance with an embodiment of the present disclosure; 
           [0047]      FIG. 2  is a flow chart illustrating a processing method performed by a receiver, in accordance with an embodiment of the present disclosure; 
           [0048]      FIG. 3  is a flow chart illustrating processing at a network side in Embodiment 1; 
           [0049]      FIG. 4  is a flow chart illustrating processing at UE 0  side in Embodiment 1; 
           [0050]      FIG. 5  is a flow chart illustrating processing at UE 1  side in Embodiment 1; 
           [0051]      FIG. 6  is a flow chart illustrating processing at a network side in Embodiment 2; 
           [0052]      FIG. 7  is a flowchart illustrating processing at a terminal side in Embodiment 2; 
           [0053]      FIG. 8  is a schematic diagram illustrating structure of an apparatus for processing a downlink control channel, in accordance with an embodiment of the present disclosure; 
           [0054]      FIG. 9  is a schematic diagram illustrating structure of a terminal for processing a downlink control channel, in accordance with an embodiment of the present disclosure; 
           [0055]      FIG. 10  is a schematic diagram illustrating structure of another apparatus for processing a downlink control channel, in accordance with an embodiment of the present disclosure; 
           [0056]      FIG. 11  is a schematic diagram illustrating structure of another apparatus for processing a downlink control channel, in accordance with an embodiment of the present disclosure. 
       
    
    
     DETAILED DESCRIPTION 
       [0057]    For reference and clarity, descriptions of technical terms used are summarized below: 
         [0058]    LTE: Long Term Evolution system; 
         [0059]    RNTI: Radio Network Temporary Identifier; 
         [0060]    GP-RNTI: Group Paging RNTI; 
         [0061]    G-RNTI: Group RNTI; 
         [0062]    CCE: Control Channel Elements; 
         [0063]    C-RNTI: Cell-RNTI; 
         [0064]    UE: User Equipment; 
         [0065]    TTI: Transmit Time Interval; 
         [0066]    PDCCH: Physical Downlink Control Channel 
         [0067]    SPS: Semi-Persistent Scheduling 
         [0068]    RRC: Radio Resource Control 
         [0069]    Specific flows of the method for processing a downlink control channel, specific structures of corresponding apparatus and system of the present disclosure will be described in detail, accompanying with the following embodiments. 
         [0070]    Refer to  FIG. 1 ,  FIG. 1  is a flow chart illustrating a method for processing a downlink control channel at a sender, in accordance with an embodiment of the present disclosure. Specific operations are as follows. 
         [0071]    When there is a group call service to be scheduled in a downlink TTI, proceed with block  101 . 
         [0072]    In block  101 , a sender determines, within the group call of a cell, whether a UE has an individual service to be scheduled in a downlink TTI at the same time. When determining there is a UE having an individual service to be scheduled in the downlink TTI simultaneously, proceed with block  102 ; when determining that no UE in the group call of the cell has an individual service to be scheduled in the downlink TTI, proceed with block  104 . 
         [0073]    In block  102 , the sender schedules the group call service within the public space, by using G-RNTI or SPS G-RNTI, and then proceeds with block  103 . 
         [0074]    In block  103 , the sender schedules the individual service within the dedicated space, by using C-RNTI or SPS C-RNTI. 
         [0075]    In block  104 , the sender schedules the group call service within the dedicated space, by using G-RNTI or SPS G-RNTI. 
         [0076]    Scheduling can be dynamic scheduling, or SPS. The foregoing individual service can be a point-to-point service. There may be at least one group call service to be scheduled in a downlink TTI. Each group call service can be scheduled, by using the above method. 
         [0077]    Block  101  may be implemented with the following method. Learn from a network side whether a UE, which has an individual service to be scheduled, belongs to the group call; or, learn from the network side a UE participating in the group call, monitor a UE having an individual service to be scheduled within the cell, and determine whether the UE belongs to the group call. 
         [0078]    Refer to  FIG. 2 ,  FIG. 2  is a flow chart illustrating a method for processing a downlink control channel at a receiver, in accordance with an embodiment of the present disclosure. Specific operations include the following blocks. 
         [0079]    In block  201 , in a downlink TTI, a UE firstly performs a PDCCH blind detection within public space, by using G-RNTI or SPS G-RNTI, and then proceeds with block  202 . 
         [0080]    In block  202 , the UE determines whether G-RNTI or SPS G-RNTI is detected, during the process of performing the PDCCH blind detection within the public space. If neither G-RNTI nor SPS G-RNTI is detected by the UE within the public space, proceed with block  205 ; if either G-RNTI or SPS G-RNTI is detected by the UE within the public space, proceed with block  203 . 
         [0081]    In block  203 , the UE determines whether the UE is in an RRC_Connected state. When determining the UE is in the RRC_Connected state, proceed with block  204 ; otherwise, proceed with block  206 . 
         [0082]    In block  204 , the UE continuously performs the PDCCH blind detection within the dedicated space, by using C-RNTI or SPS C-RNTI, and then proceed with block  206 . 
         [0083]    In block  205 , the UE performs the PDCCH blind detection within the dedicated space, by using G-RNTI or SPS G-RNTI, and then proceed with block  206 . 
         [0084]    In block  206 , the UE terminates the PDCCH blind detection. 
         [0085]    By using the above method, multiple groups of cluster services may be supported by the system effectively, without increasing the number of blind detections performed by the UE to the downlink control channel. 
         [0086]    Specific descriptions about some applications of the above methods will be provided in the following, accompanying with Embodiment 1 and Embodiment 2: 
       Embodiment 1 
       [0087]    For example, there are three UEs in a cell of a base station, which are UE 0 ˜UE 2  respectively. In the cell, there is a cluster service with G-RNTI  15 , which corresponds to UE 0 ˜UE 2  respectively. UE 0  is in an RRC_Connected state. UE 1  and UE 2  are respectively in an RRC_Idle state. If C-RNTI of UE 0  is 5, there are cluster-group paging services of G-RNTI and data downloading services of UE 0  at the same time in a certain downlink TTI. 
         [0088]    For the processing flow at sender, i.e., at the base station side, please refer to  FIG. 3 . According to the above descriptions, it can be seen that there is a group call service in a downlink TTI of the cell. Meanwhile, UE 0  has a data downloading service to be scheduled in such downlink TTI. For the base station side, i.e., the network side, processing flow includes the following blocks. 
         [0089]    In block  301 , schedule the group call service within public space, by using G-RNTI, i.e.,  15 , and then proceed with block  302 . 
         [0090]    In block  302 , schedule the data downloading service of UE 0  within dedicated space, by using C-RNTI, i.e.,  5 . 
         [0091]    For the processing flow at receiver, i.e., at UE 0  side, refer to  FIG. 4 . According to the above descriptions, it can be seen that UE 0  is in an RRC_Connected state in a downlink TTI. Subsequently, the processing flow at UE 0  side includes the following blocks. 
         [0092]    In block  401 , UE 0  performs a PDCCH blind detection within public space, by using G-RNTI, i.e.,  15 . When detecting G-RNTI, proceed with block  402 . 
         [0093]    In block  402 , UE 0  continuously performs the PDCCH blind detection within the dedicated space, by using C-RNTI, i.e.,  5 . When detecting C-RNTI, proceed with block  403 . 
         [0094]    In block  403 , UE 0  terminates the PDCCH blind detection. 
         [0095]    For the processing flow at receiver, i.e., at UE 1  side, refer to  FIG. 5 . According to the above descriptions, it can be seen that UE 1  is in an RRC_Idle state in a downlink TTI. Subsequently, the processing flow at UE 1  side includes the following blocks. 
         [0096]    In block  501 , UE 1  performs a PDCCH blind detection within public space, by using G-RNTI, i.e.,  15 . When detecting G-RNTI, proceed with block  502 . 
         [0097]    In block  502 , UE 1  terminates the PDCCH blind detection. 
         [0098]    The processing flow at UE 2  side is the same as that at UE 1  side, which is not repeated here. 
       Embodiment 2 
       [0099]    For example, there are two UEs in a cell of a base station, which are UE 0 ˜UE 1  respectively. In the cell, there is a cluster service with G-RNTI  21 , which corresponds to UE 0 ˜UE 1  respectively. UE 0  is in an RRC_Idle state. UE 1  is in an RRC_Connected state. If C-RNTI of UE 1  is  17 , there are only cluster-group paging services of G-RNTI in a downlink TTI. 
         [0100]    For the processing flow at sender, i.e., at the base station side, please refer to  FIG. 6 . According to the above descriptions, it can be seen that there is a group call service of a cell in a downlink TTI. Within such TTI, each UE (UE 0  and UE 1 ) of the group call has no individual service to be scheduled. Subsequently, the processing flow at sender, i.e., at the network side, includes the following blocks. 
         [0101]    In block  601 , schedule the group call service within dedicated space, by using G-RNTI, i.e.,  21 . 
         [0102]    Regarding the processing flow at receiver, please refer to  FIG. 7 . 
         [0103]    According to the above descriptions, it can be seen that UE 0  is in an RRC_Idle state in a downlink TTI. The processing flow at UE 0  side is as follows. 
         [0104]    In block  701 , UE 0  firstly performs a blind detection within public space, by using G-RNTI, i.e.,  21 . When not detecting the G-RNTI, proceed with block  702 . 
         [0105]    In block  702 , UE 0  continuously performs the PDCCH blind detection within the dedicated space, by using G-RNTI, i.e.,  21 . When detecting the G-RNTI, proceed with block  703 . 
         [0106]    In block  703 , UE 0  terminates the PDCCH blind detection. 
         [0107]    According to the above descriptions, it can be seen that UE 1  is in an RRC_Connected state in a downlink TTI. The processing flow at UE 1  side is as follows (not shown in  FIG. 7 ). 
         [0108]    UE 1  performs the PDCCH blind detection within public space. When not detecting the G-RNTI within the public space, UE 1  continuously performs the PDCCH blind detection within dedicated space, by using G-RNTI. After detecting the G-RNTI, terminate the PDCCH blind detection. 
       Embodiment 3 
       [0109]    As shown in  FIG. 8 , Embodiment 3 of the present disclosure discloses an apparatus  800  for processing a downlink control channel, which includes a first scheduling module  801  and a second scheduling module  802 . The first scheduling module  801  is configured to schedule a group call service, which includes as follows. In a downlink TTI, when a UE of the group call has an individual service to be scheduled, schedule the group call service within public space, by using G-RNTI or SPS G-RNTI; still in the downlink TTI, when each UE in the group call has no individual service to be scheduled, schedule the group call service within dedicated space, by using G-RNTI or SPS G-RNTI. When a UE of the group call has an individual service to be scheduled in such downlink TTI, the second scheduling module  802  is configured to schedule the individual service of the UE within the dedicated space, by using C-RNTI or SPS C-RNTI. 
         [0110]    Furthermore, the apparatus includes a service monitoring module  803 , which is configured to monitor, whether each UE of the group call in a cell has an individual service to be scheduled in the downlink TTI, inform the first scheduling module  801  and the second scheduling module  802 . The monitoring includes as follows. Learn from a network side whether the UE having an individual service to be scheduled belongs to the group call; or learn from the network side the UE participating in the group call, monitor the UE within the cell having an individual service to be scheduled, and determine whether the UE belongs to the group call. 
         [0111]    The scheduling is dynamic scheduling or SPS. There is at least one group call service. In the downlink TTI, there is at least one UE having an individual service to be scheduled. The individual service is a point-to-point service. 
       Embodiment 4 
       [0112]    As shown in  FIG. 9 , Embodiment 4 of the present disclosure discloses a terminal  900 , which includes a first module  901 . The first module  901  is configured to perform a PDCCH blind detection within public space in a downlink TTI, by using G-RNTI or SPS G-RNTI in a downlink TTI. When not detecting the G-RNTI and SPS G-RNTI within public space, the first module  901  is further configured to continuously perform the PDCCH blind detection within dedicated space, and then terminate the PDCCH blind detection. 
         [0113]    When detecting the G-RNTI or SPS G-RNTI within the public space, during the process of performing the PDCCH blind detection, and the terminal is in an RRC_Idle state, the first module  901  is further configured to exit the PDCCH blind detection. 
         [0114]    The terminal further includes a second module  902 . After detecting G-RNTI or SPS G-RNTI within the public space, during the process of performing the PDCCH blind detection, and the terminal is in an RRC_Connected state, the second module  902  is configured to perform the PDCCH blind detection within the dedicated space, by using C-RNTI or SPS C-RNTI, and then exit the PDCCH blind detection. 
         [0115]    Preferably, the terminal further includes a third module  903 , which is configured to record whether the terminal is in an RRC_Connected state or RRC_Idle state. 
       Embodiment 5 
       [0116]    As shown in  FIG. 10 , the present disclosure also discloses an apparatus for processing a downlink control channel. The apparatus includes a central processing unit (CPU)  101 , a memory  102  and a non-transitory storage  103 . 
         [0117]    The non-transitory storage  103  is configured to store a computer program, which may realize processing of the downlink control channel. 
         [0118]    The CPU  101  is configured to load the computer program from the non-transitory storage  103  into the memory  102  to be run, so as to form computer executable instructions. The computer executable instructions include a first scheduling instruction  1021  and a second scheduling instruction  1022 . 
         [0119]    The first scheduling instruction  1021  indicates to schedule a group call service, which includes as follows. In a downlink TTI, when a UE within a group call has an individual service to be scheduled, the first scheduling instruction  1021  indicates to schedule the group call service within the public space, by using G-RNTI or SPS G-RNTI. Still in the downlink TTI, when each UE within the group call has no individual service to be scheduled, the first scheduling instruction  1021  indicates to schedule the group call service within the dedicated space, by using G-RNTI or SPS G-RNTI. In the downlink TTI, when a UE within such group call has an individual service to be scheduled, the second scheduling instruction  1022  indicates to schedule the individual service of the UE within the dedicated space, by using C-RNTI or SPS C-RNTI. 
         [0120]    Furthermore, the computer executable instructions also include a service monitoring instructions  1023 , which indicates to monitor in a downlink TTI, whether a UE of the group call in a cell has an individual service to be scheduled. The monitoring includes as follows. Learn from a network side, whether the UE having an individual service to be scheduled belongs to the group call; or learn from the network side the UE participating in the group call, and monitor, whether a UE having an individual service to be scheduled within the cell, belongs to the group call. 
         [0121]    The scheduling is a dynamic scheduling or SPS. There is at least one group call service. In the downlink TTI, there is at least one UE having an individual service to be scheduled. The individual service is a point-to-point service. 
       Embodiment 6 
       [0122]    As shown in  FIG. 11 , the present disclosure also discloses a terminal, which includes a CPU  111 , a memory  112  and a non-transitory storage  113 . 
         [0123]    The non-transitory storage  113  is configured to store a computer program, which may realize processing of a downlink control channel. 
         [0124]    The CPU  111  is configured to load the computer program from the non-transitory storage  113  into the memory  112  to be run, so as to form computer executable instructions. The computer executable instructions include a first instruction  1121 . 
         [0125]    The first instruction  1121  indicates to perform a PDCCH blind detection within public space of a downlink TTI, by using G-RNTI or SPS G-RNTI. When not detecting the G-RNTI and SPS G-RNTI within the public space, the first instruction  1121  indicates to continuously perform the PDCCH blind detection within dedicated space, and then exit the PDCCH blind detection. 
         [0126]    Furthermore, when detecting G-RNTI or SPS G-RNTI within the public space, and the terminal is in an RRC_Idle state, the first instruction  1121  also indicates to exit the PDCCH blind detection. 
         [0127]    The computer executable instructions further include a second instruction  1122 . When detecting the G-RNTI or SPS G-RNTI within the public space, during the process of performing the PDCCH blind detection, and the terminal is in an RRC_Connected state, the second instruction  1122  indicates to perform the PDCCH blind detection within the dedicated space, by using C-RNTI or SPS C-RNTI, and then exit the PDCCH blind detection. 
         [0128]    The computer executable instructions further include a third instruction  1123 , which indicates to record whether the terminal is in an RRC_Connected state or RRC_Idle state. 
         [0129]    The present disclosure also provides a system for processing a downlink control channel. The system includes an apparatus for processing a downlink control channel and a terminal described above. 
         [0130]    As can be seen from the above embodiments, by adopting the method, apparatus and system for processing a downlink control channel in the present disclosure, concurrent scheduling of multiple groups of cluster services may be supported, gain of a cluster service system may be improved. Meanwhile, it is not necessary for a UE to perform additional blind detections, thereby reducing searching complexity of the UE. 
         [0131]    What is described in the foregoing are only some embodiments of the present disclosure, and should not be construed as limitations to the present disclosure. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present disclosure should be covered by the protecting scope of the present disclosure.