CN112788766B - Downlink control channel resource allocation method, device, communication equipment and storage medium - Google Patents

Downlink control channel resource allocation method, device, communication equipment and storage medium Download PDF

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CN112788766B
CN112788766B CN202011635717.5A CN202011635717A CN112788766B CN 112788766 B CN112788766 B CN 112788766B CN 202011635717 A CN202011635717 A CN 202011635717A CN 112788766 B CN112788766 B CN 112788766B
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terminal
downlink control
control information
candidate
resource
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CN112788766A (en
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徐慧俊
钟梓滢
陈林
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Comba Network Systems Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA

Abstract

The application relates to a method and a device for allocating downlink control channel resources, communication equipment and a storage medium. The method comprises the following steps: acquiring candidate resources of the downlink control channel; acquiring downlink control information of a second terminal when a first terminal occupies a data transmission channel of the second terminal; distributing control information transmission resources for the second terminal downlink control information according to the candidate resources; the control information transmission resource is used for transmitting the downlink control information of the second terminal to the second terminal; the downlink control information of the second terminal is used for the second terminal to determine the data transmission channel again. By adopting the method, the algorithm complexity of resource allocation can be reduced.

Description

Downlink control channel resource allocation method, device, communication equipment and storage medium
Technical Field
The present application relates to the field of mobile communications technologies, and in particular, to a method, an apparatus, a communication device, and a storage medium for allocating downlink control channel resources.
Background
As the 3GPP standard evolves, the current mobile communication technology has entered into the development and deployment phase of NR (New Radio), which supports three traffic types: eMBBs (enhanced Mobile BroadBand), URLLC (Ultra-Reliable and Low Latency Communications), and mMTC (massive Machine Type Communications). At present, 3GPP has standardized eMBB services, and requires NR downlink to support multiplexing transmission of URLLC and eMBB.
eMBB has higher requirement on data transmission speed, URLLC has higher requirement on communication delay and reliability, the 3GPP standard has the requirement on URLLC that the uplink/downlink one-way user plane delay is 0.5 millisecond, and the reliability reaches 1-10 bytes of data packets -5 In the case of (1), the user plane delay is 1 millisecond. The current URLLC and eMMC downlink multiplexing method is characterized in that a transmission time slot is dynamically configured for URLLC in eMMC resources, URLLC data is transmitted in the transmission time slot, the method needs to comprehensively consider the requirements of the URLLC on time delay and reliability and the requirements of the eMMC on data transmission speed, the transmission time slot is dynamically allocated, compromise needs to be carried out between the performances of the URLLC and the eMMC, the performance requirements of the URLLC and the eMMC are difficult to meet, and the algorithm complexity is high easily caused.
Therefore, the current resource allocation technology for URLLC and eMB multiplexing has the problem of high algorithm complexity.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a downlink control channel resource allocation method, an apparatus, a communication device, and a storage medium, which can reduce algorithm complexity.
A method for allocating downlink control channel resources, the method comprising:
Acquiring candidate resources of the downlink control channel;
acquiring downlink control information of a second terminal when a first terminal occupies a data transmission channel of the second terminal;
distributing control information transmission resources for the second terminal downlink control information according to the candidate resources; the control information transmission resource is used for transmitting the downlink control information of the second terminal to the second terminal; the downlink control information of the second terminal is used for the second terminal to determine the data transmission channel again.
In one embodiment, the method further comprises:
acquiring at least one downlink control message; the downlink control information corresponds to a terminal;
determining a terminal list according to the priority order of the downlink control information;
determining the first terminal according to the terminal list;
when the first terminal occupies the data transmission channel of the second terminal, the downlink control information of the second terminal is set as the highest priority;
and inserting the second terminal into the terminal list according to the highest priority.
In one embodiment, the allocating, according to the candidate resource, a control information transmission resource for downlink control information of the second terminal includes:
Acquiring a target aggregation level of the downlink control information of the second terminal;
judging whether the candidate resources have unoccupied target resources with aggregation levels matched with the target aggregation levels;
and if so, allocating the target resource to the second terminal.
In one embodiment, the obtaining the candidate resource of the downlink control channel includes:
determining a candidate resource parameter of the downlink control channel; the candidate resource parameter comprises at least one of a search space period, a downlink control information format, a candidate number of downlink control channels, a symbol number of a control resource set and a bandwidth of the control resource set;
and obtaining the candidate resources of the downlink control channel according to the candidate resource parameters.
In one embodiment, the determining the candidate resource parameter of the downlink control channel includes:
acquiring terminal monitoring capacity and a service scheduling period;
determining a downlink control channel monitoring mode according to a preset lookup table through the terminal monitoring capability and the service scheduling period;
determining the search space period according to the downlink control channel monitoring mode; the search space period corresponds to a symbol.
In one embodiment, the determining the candidate resource parameter of the downlink control channel further includes:
acquiring the supporting situation of the preemption function;
and determining the format of the downlink control information according to the supporting condition of the preemption function.
In one embodiment, the determining the candidate resource parameter of the downlink control channel further includes:
acquiring the number of search spaces and first blind detection capability;
and obtaining the candidate number of the downlink control channels according to the ratio of the first blind detection capability to the number of the search spaces.
In one embodiment, the determining the candidate resource parameter of the downlink control channel further includes:
obtaining the value range of the control resource set symbol number according to the downlink control channel monitoring mode;
obtaining a system capacity index and a single symbol reachable index;
determining a ratio between the system capacity indicator and the single sign reachable indicator;
and if the ratio is within the value range, obtaining the number of the control resource set symbols according to the ratio.
In one embodiment, the determining the candidate resource parameter of the downlink control channel further includes:
Acquiring the number of search spaces and second blind detection capability;
obtaining the candidate number of the control channel units according to the ratio of the second blind detection capability to the number of the search spaces;
and obtaining the bandwidth of the control resource set according to the ratio of the candidate number of the control channel units to the symbol number of the control resource set.
An apparatus for allocating downlink control channel resources, the apparatus comprising:
a first obtaining module, configured to obtain a candidate resource of the downlink control channel;
a second obtaining module, configured to obtain downlink control information of the second terminal when the first terminal occupies a data transmission channel of the second terminal;
a resource allocation module, configured to allocate a control information transmission resource for the second terminal downlink control information according to the candidate resource; the control information transmission resource is used for transmitting the downlink control information to the second terminal; the downlink control information of the second terminal is used for the second terminal to determine the data transmission channel again.
A communication device comprising a memory and a processor, the memory storing a computer program, the processor when executing the computer program implementing the steps of:
Acquiring candidate resources of the downlink control channel;
acquiring downlink control information of a second terminal when a first terminal occupies a data transmission channel of the second terminal;
distributing control information transmission resources for the second terminal downlink control information according to the candidate resources; the control information transmission resource is used for transmitting the downlink control information of the second terminal to the second terminal; the downlink control information of the second terminal is used for the second terminal to determine the data transmission channel again.
A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:
acquiring candidate resources of the downlink control channel;
acquiring downlink control information of a second terminal when a first terminal occupies a data transmission channel of the second terminal;
distributing control information transmission resources for the second terminal downlink control information according to the candidate resources; the control information transmission resource is used for transmitting the downlink control information of the second terminal to the second terminal; the downlink control information of the second terminal is used for the second terminal to determine the data transmission channel again.
The method, the device, the communication equipment and the storage medium for allocating downlink control channel resources can obtain unoccupied downlink control channel resources by obtaining the candidate resources of the downlink control channel, obtain the downlink control information of the second terminal when the first terminal occupies the data transmission channel of the second terminal, allocate the control information transmission resources for the downlink control information of the second terminal according to the candidate resources, obtain the downlink control information corresponding to the eMMC service when the URLLC terminal occupies the data transmission resources of the eMMC terminal, and transmit through the unoccupied downlink control channel resources, so that the eMMC terminal re-determines the data transmission channel according to the received downlink control information, and ensure that the eMMC service can be realized and the multiplexing transmission of the URLLC and the eMMC is realized while the URLLC service requirement is preferentially met, because the resources are respectively allocated according to the URLLC and the eMMC, the algorithm complexity of resource allocation can be reduced.
Drawings
Fig. 1 is a diagram of an application scenario of a downlink control channel resource allocation method in an embodiment;
fig. 2 is a flowchart illustrating a method for allocating downlink control channel resources according to an embodiment;
fig. 3 is a flowchart illustrating a method for allocating downlink control channel resources according to another embodiment;
FIG. 4 is a flowchart illustrating a method for configuring a search space according to one embodiment;
FIG. 5 is a flow diagram illustrating a method for controlling resource set allocation in one embodiment;
fig. 6 is a block diagram illustrating a downlink control channel resource allocation apparatus according to an embodiment;
fig. 7 is an internal configuration diagram of a communication device in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The method for allocating downlink control channel resources provided by the present application can be applied to the application environment shown in fig. 1. Wherein the terminal 102 communicates with the base station 104 through a mobile communication network. The terminal 102 may be, but is not limited to, various personal computers, laptops, smartphones, tablets, and portable wearable devices, the base station 104 may be, but is not limited to, various macro base stations, micro base stations, pico base stations, and distributed base stations, and further, the base station 104 may be a 5G base station.
In an embodiment, as shown in fig. 2, a method for allocating downlink control channel resources is provided, which is described by taking the method as an example applied to the base station in fig. 1, and includes the following steps:
Step S210, obtaining candidate resources of the downlink control channel.
The candidate resource may be a time-frequency resource for transmitting DCI (Downlink Control Information).
In a specific implementation, the base station may determine a search space parameter and/or a Control Resource Set (CORESET) parameter according to a service requirement, and determine a candidate Resource of a PDCCH (Physical Downlink Control Channel) according to the search space parameter and/or the Control Resource Set parameter.
For example, the base station may determine search space parameters including a search space period, a common search space DCI format, and a search space PDCCH candidate number according to the URLLC service requirement, and configure PDCCH-Config and SearchSpace parameters related to a search space according to the search space parameters; the base station can also determine control resource set parameters including CORESET symbol number and CORESET bandwidth according to URLLC service requirements, and configure PDCCH-Config and ControlResorceSet parameters related to the control resource set according to the control resource set parameters. The base station may determine the PDCCH candidate resource according to PDCCH-Config, SearchSpace, and ControlResorceSet. The base station may also configure PDCCH-Config, SearchSpace, and ControlResorceSet parameters for the UE by sending an RRC (Radio Resource Control) connection reconfiguration message to the UE (User Equipment, terminal), so that the UE receives DCI information sent by the PDCCH according to the parameters.
Step S220, when the first terminal occupies the data transmission channel of the second terminal, acquiring the downlink control information of the second terminal.
The first terminal may be a terminal that preempts a data transmission channel, the second terminal may be a terminal that is preempted a data transmission channel, and further, the first terminal may be a URLLC service terminal, and the second terminal may be an eMBB service terminal.
The data transmission Channel may be a PDSCH (Physical Downlink Shared Channel) or a PUSCH (Physical Uplink Shared Channel).
In a specific implementation, in order to ensure that the first terminal can implement high-reliability low-delay communication, a preemption function may be set for data transmission of the first terminal, that is, when the first terminal requests data transmission, if data transmission resources available for allocation to the first terminal in the base station are insufficient and it is difficult to ensure reliable data transmission of the first terminal, data transmission resources already allocated to the second terminal may be preempted, and the preempted resources are used to perform data transmission on the first terminal. If it is desired to perform data transmission on the second terminal after the data of the first terminal is successfully transmitted, DCI information corresponding to the data transmission of the second terminal may be acquired, so as to re-determine a data transmission channel of the second terminal according to the DCI information, and perform data transmission on the second terminal through the re-determined data transmission channel.
In practical applications, schedulable UEs of a current TTI (Transmission Time Interval) of the URLLC may be ordered according to a preset priority order to obtain a UE list (UeList), where the UE may be ordered according to DCI messages corresponding to the UEs, for example, the UE may be ordered according to a priority that a common DCI (broadcast, random access, paging) is superior to a function type common DCI (power allocation), a function type common DCI is superior to a downlink scheduling DCI, a downlink scheduling DCI is superior to an uplink scheduling DCI, and the UE may also be ordered according to a priority that a common DCI is superior to a service scheduling (downlink, uplink cross allocation).
Sequentially taking out one unallocated DCI message from the UE list, and acquiring an Aggregation Level (AL) corresponding to the DCI message, wherein the Aggregation Level can be the minimum Aggregation Level which is selected by the base station and meets the PDCCH demodulation performance according to the PDCCH Channel Quality and the BLER (Block Error Rate) of the PDCCH indicated by a CQI (Channel Quality Indicator).
The base station may search, according to a sequence from small to large of frequency domain positions of the candidate resources, whether there is an unoccupied candidate resource with L ═ L, where L' is an aggregation level of the candidate resource, and L is an aggregation level of a DCI message corresponding to the current UE, if there is no unoccupied candidate resource with L ═ L, it may determine that resource allocation of the current UE fails, and select a next unassigned DCI message from the UE list, and repeat the above process, otherwise, if there is an unoccupied candidate resource with L ═ L, a CCE (Control Channel Element) of the unoccupied candidate resource may be allocated to the current UE, and the base station may transmit the DCI message to the UE through the CCE, so that the current UE receives the PDSCH.
When the PDSCH resource available for being allocated to the current UE in the base station is insufficient, the current UE can preempt the PDSCH of the eMBB UE, and the preempted base station can acquire the DCI message of the preempted eMBB UE.
Step S230, distributing control information transmission resources for the downlink control information of the second terminal according to the candidate resources; the control information transmission resource is used for transmitting the downlink control information of the second terminal to the second terminal; the second terminal downlink control information is used for the second terminal to re-determine the data transmission channel.
In a specific implementation, after obtaining the DCI information corresponding to the data transmission of the second terminal, the base station may select a resource that can be allocated to the DCI information from the candidate resources, and allocate the resource to the second terminal as a control information transmission resource.
In practical application, when the PDSCH resource available for allocation to the current UE in the base station is insufficient, the current UE preempts the PDSCH of the eMBB UE, the base station may obtain the DCI message of the preempted eMBB UE, set the DCI message as the highest priority, insert the DCI message into the UE list, and when the DCI message that is not allocated is selected from the UE list in sequence, preferentially select the DCI of the preempted eMBB UE for allocation.
The method for allocating downlink control channel resources obtains the candidate resources of the downlink control channel, unoccupied downlink control channel resources are available, and when the first terminal preempts the data transmission channel of the second terminal, acquiring the downlink control information of the second terminal, allocating control information transmission resources for the downlink control information of the second terminal according to the candidate resources, can acquire the downlink control information corresponding to the eMB service when the URLLC terminal occupies the data transmission resource of the eMB terminal, and transmits through the unoccupied downlink control channel resources, so that the eMBB terminal re-determines the data transmission channel according to the received downlink control information, while preferentially meeting the URLLC service requirement, the method ensures that eMBB service can be realized, realizes the multiplexing transmission of URLLC and eMBB, since the resource allocation is respectively carried out aiming at the URLLC and the eMBB, the algorithm complexity of the resource allocation can be reduced.
In an embodiment, the method for allocating downlink control channel resources further includes: acquiring at least one downlink control message; the downlink control information corresponds to the terminal; determining a terminal list according to the priority order of the downlink control information; determining a first terminal according to the terminal list; when the first terminal occupies the data transmission channel of the second terminal, the downlink control information of the second terminal is set as the highest priority; and inserting the second terminal into the terminal list according to the highest priority.
In the concrete implementation, the current TTI has at least one schedulable UE, each schedulable UE corresponds to a DCI message, the schedulable UEs can be sequenced from high to low according to the DCI priority to obtain a UE list, the DCI message with the highest priority and without being allocated is taken out from the UE list in sequence, the corresponding terminal is determined as the first terminal, transmission resources are allocated to the DCI message of the first terminal according to the aggregation level, and then the data transmission channel of the first terminal is determined, when the data transmission resources available for being allocated to the first terminal are insufficient, the first terminal can preempt the data transmission channel of the second terminal, in order to ensure that the second terminal data can be transmitted continuously after the first terminal completes the data transmission, the DCI message of the second terminal can be set as the highest priority to be inserted into the UE list, when the unallocated DCI message is selected from the UE list in sequence subsequently, the DCI message of the second terminal may be preferentially selected for allocation.
In this embodiment, by obtaining at least one piece of downlink control information, determining a terminal list according to a priority order of the downlink control information, performing resource allocation according to a priority of the downlink control information, ensuring that a high-priority service is executed preferentially, determining a first terminal according to the terminal list, when the first terminal occupies a data transmission channel of a second terminal, setting the downlink control information of the second terminal to be a highest priority, inserting the second terminal into the terminal list according to the highest priority, performing a first terminal service with high requirements on delay and reliability preferentially, and then allocating downlink control information resources to the occupied second terminal, ensuring that the second terminal service can continue to be performed, thereby ensuring multiplexing of the first terminal service and the second terminal service.
In an embodiment, the step S230 may specifically include: acquiring a target aggregation level of downlink control information of a second terminal; judging whether the candidate resources have unoccupied target resources with aggregation levels matched with the target aggregation levels; and if so, allocating the target resource to the second terminal.
In the concrete implementation, the base station may obtain the aggregation level corresponding to the DCI message of the second terminal, use the aggregation level as a target aggregation level, and search whether there is an unoccupied candidate resource with an aggregation level as the target aggregation level according to a sequence of the frequency domain positions of the candidate resources from small to large, if there is no unoccupied candidate resource with an aggregation level as the target aggregation level, it may determine that the DCI message of the second terminal fails to be allocated, and select a next unallocated DCI message in the UE list for allocation, otherwise, if there is an unoccupied candidate resource with an aggregation level as the target aggregation level, it may determine the candidate resource as a target resource, and allocate the target resource to the second terminal for DCI message transmission.
In this embodiment, by obtaining the target aggregation level of the downlink control information of the second terminal, determining whether an unoccupied target resource exists in the candidate resources and whether the aggregation level matches the target aggregation level, the candidate resource suitable for transmitting the downlink control information of the second terminal may be obtained, and if such a candidate resource exists, the candidate resource is allocated to the second terminal, which may ensure that the DCI of the second terminal is transmitted after the DCI transmission of the first terminal is completed, ensure that the DCI of the second terminal may continue to be performed, and ensure the multiplexing of the first terminal service and the second terminal service.
In an embodiment, the step S210 may specifically include:
step S211, determining a candidate resource parameter of a downlink control channel; the candidate resource parameter comprises at least one of search space period, downlink control information format, candidate number of downlink control channels, symbol number of control resource sets and bandwidth of the control resource sets;
step S212, according to the candidate resource parameter, obtaining the candidate resource of the downlink control channel.
In specific implementation, the candidate resource parameters may include search space parameters and control resource set parameters, and the base station may determine, according to service requirements, search space parameters including a search space period, a common search space DCI format, and a search space PDCCH candidate number, and configure PDCCH-Config and SearchSpace parameters related to a search space according to the search space parameters; the base station can also determine control resource set parameters including CORESET symbol number and CORESET bandwidth according to URLLC service requirements, and configure PDCCH-Config and ControlResorceSet parameters related to the control resource set according to the control resource set parameters. The base station may determine the PDCCH candidate resource according to PDCCH-Config, SearchSpace, and ControlResorceSet.
In this embodiment, by determining the candidate resource parameter of the downlink control channel and obtaining the candidate resource of the downlink control channel according to the candidate resource parameter, the candidate resource of the downlink control channel can be directly determined according to the service requirement, and the algorithm complexity of the resource allocation of the downlink control channel is reduced.
In an embodiment, the step S211 may specifically include: acquiring terminal monitoring capacity and a service scheduling period; determining a downlink control channel monitoring mode according to a preset lookup table through terminal monitoring capacity and a service scheduling period; determining a search space period according to a downlink control channel monitoring mode; the search space period corresponds to a symbol.
The terminal monitoring capability may be a capability of the UE PDCCH monitoring any case with span gap (PDCCH-monitoring and interference with gaps).
In a specific implementation, a suitable (X, Y) combination can be selected as a downlink control channel monitoring mode according to a preset lookup table and a UE capability pdcch-monitoring anyoccasionswithspangap and a URLLC service scheduling period TTI.
The UE capability pdcch-MonitoringAnyOccasionsWithSpanGap may be a parameter reported by the UE:
Figure BDA0002876217960000101
where scs is a subcarrier spacing, set1 indicates that the UE supports only the (7, 3) monitoring mode, set2 indicates that the UE supports the (4, 3) and (7, 3) monitoring modes, and set3 indicates that the UE supports the (2, 2), (4, 3) and (7, 3) monitoring modes.
Wherein the predetermined lookup table may be
Reporting UE capability set1 Reporting UE capability set2 Reporting UE capability set3
TTI＝2OS Selection (7, 3) Selection (4, 3) Selection (2, 2)
TTI＝4OS Selection (7, 3) Selection (4, 3) Selection (4, 3)
TTI＝7OS Selection (7, 3) Selection (7, 3) Selection (7, 3)
TABLE 1
Here, the os (OFDM symbols) may be an OFDM symbol number.
The search space period may be configured according to X of the (X, Y) combination, and when (2, 2) is selected, the period of the search space may be 2 OSs; when (4, 3) is selected, the period of the search space may be 4 OSs; when (7, 3) is selected, the period of the search space may be 7 OSs.
In this embodiment, a downlink control channel monitoring mode is determined by obtaining a terminal monitoring capability and a service scheduling period, according to a preset lookup table, through the terminal monitoring capability and the service scheduling period, and a search space period is determined according to the downlink control channel monitoring mode, so that an OFDM symbol can be used as a scheduling period, a low delay requirement of URLLC communication is met, and URLLC performance is ensured.
In an embodiment, the step S211 may further include: acquiring the supporting situation of the preemption function; and determining the format of the downlink control information according to the supporting condition of the preemption function.
The preemption function support situation may be a situation that whether the system needs the UE to support the uplink/downlink preemption function.
The downlink control channel format may be DCI format.
In a specific implementation, a search space 1 for URLLC service scheduling may be configured for the UE, where the DCI Format 0_2/1_2 is selected for the search space 1 for service scheduling; in addition, if the UE needs to support the downlink preemption function, a common search space 2 for the URLLC service to preempt the eMBB service downlink resource may be configured for the UE, and the common search space 2 selects DCI Format 2_ 1; if the UE needs to support the uplink preemption function, a common search space 3 for the URLLC service to preempt the eMBB service uplink resource may be configured for the UE, and the DCI Format 2_4 is selected for the common search space 3.
In this embodiment, by obtaining the preemption function support condition and determining the downlink control information format according to the preemption function support condition, a downlink control channel format different from the eMBB may be configured for the URLLC service, so as to implement flexibility of URLLC service individual scheduling, and ensure implementation of high-reliability low-delay performance.
In an embodiment, the step S211 may further include: acquiring the number of search spaces and first blind detection capability; and obtaining the candidate number of the downlink control channels according to the ratio of the first blind detection capability to the number of the search spaces.
The number of the search spaces may be the number of common and dedicated search spaces, and the first blind detection capability may be a capability of the UE for blind detection of the PDCCH.
In a specific implementation, the number of PDCCH candidates in each search space may be determined according to the number of common and dedicated search spaces and the capability of the UE to blindly detect the PDCCH, and the calculation formula of the number of PDCCH candidates may be M-floor (M) max /N ss )。
Wherein N is ss May be the number of search spaces, M max The UE may be able to blindly detect the PDCCH.
The capability of the UE to blindly detect the PDCCH may be the maximum PDCCH candidate number, which may be specifically determined by table 2.
(2，2) (4，3) (7，3)
Subcarrier spacing of 15kHz M max ＝14 M max ＝28 M max ＝44
Subcarrier spacing of 30kHz M max ＝12 M max ＝24 M max ＝36
TABLE 2
In this embodiment, by obtaining the number of search spaces and the first blind detection capability and obtaining the number of downlink control channel candidates according to the ratio between the first blind detection capability and the number of search spaces, the calculation complexity of the number of downlink control channel candidates can be reduced, and the complexity of the resource allocation algorithm is further reduced.
In an embodiment, the step S211 may further include: obtaining a value range of the symbol number of the control resource set according to a downlink control channel monitoring mode; obtaining a system capacity index and a single symbol reachable index; determining a ratio between a system capacity indicator and a single sign reachable indicator; and if the ratio is in the value range, obtaining the number of the control resource set symbols according to the ratio.
The system capacity index may be the number of users of URLLC in a cell and/or the number of scheduled users in a transmission time interval.
The single symbol reachable index can be an index requirement that a single symbol can reach under the bandwidth of a cell.
In specific implementation, the number of users of URLLC in a cell can be recorded as N ue The number of scheduled users in a transmission time interval is recorded as
Figure BDA0002876217960000131
The desirable range of the number of CORESET symbols may be determined by Y in the (X, Y) combination, i.e., the desirable range of the number of symbols does not exceed Y. By comparing the ratio of the index requirement of the system capacity to the index requirement which can be achieved by a single symbol under the cell bandwidth with the desirable range of the symbol number, the smaller value can be used as the symbol number N of the control resource set sym The calculation formula can be
Figure BDA0002876217960000132
In this embodiment, the value range of the number of control resource symbols is obtained according to the downlink control channel monitoring mode, so that the number of control resource symbols does not exceed the continuous symbol length of the PDCCH monitored each time, a system capacity index and a single symbol reachable index are obtained, a ratio between the system capacity index and the single symbol reachable index is determined, and if the ratio is within the value range, the number of control resource symbols is obtained according to the ratio, so that the calculation complexity of the number of control resource symbols can be reduced, and the complexity of a resource allocation algorithm is further reduced.
In an embodiment, the step S211 may further include: acquiring the number of search spaces and second blind detection capability; obtaining the candidate number of the control channel units according to the ratio of the second blind detection capability to the number of the search spaces; and obtaining the bandwidth of the control resource set according to the ratio of the candidate number of the control channel units to the symbol number of the control resource set.
The number of the search spaces can be the number of common search spaces and the number of the dedicated search spaces. The second blind detection capability may be a capability of the UE to blind detect the PDCCH.
In a specific implementation, the number of the common search spaces may be determined by the number of functions such as uplink and downlink preemption, group power control command issue, and the like that are supported, and when only the function types are different and the parameters of the remaining search spaces are the same, the common search spaces may be regarded as 1 common search space. The number of the dedicated search spaces may be configured by the base station according to the URLLC service type, and when the search space parameters are the same, these dedicated search spaces may be regarded as 1 dedicated search space. The capability of the UE to blind-detect the PDCCH may be the maximum number of blind-detect CCEs, which may be determined by table 3.
(2，2) (4，3) (7，3)
Subcarrier spacing of 15kHz C max ＝18 C max ＝36 C max ＝56
Subcarrier spacing of 30kHz C max ＝18 C max ＝36 C max ＝56
TABLE 3
The calculation formula for controlling the resource set bandwidth may be Nrb ═ floor (C) max /N ss /N sym )。
In this embodiment, by obtaining the number of search spaces and the second blind detection capability, the number of candidates of the control channel unit is obtained according to the ratio between the second blind detection capability and the number of search spaces, and the bandwidth of the control resource set is obtained according to the ratio between the number of candidates of the control channel unit and the number of symbols of the control resource set, the computational complexity of the bandwidth of the control resource set can be reduced, and the complexity of a resource allocation algorithm is further reduced.
In one embodiment, a method for allocating and scheduling resources of a URLLC downlink control channel is provided, which includes the following steps:
1. when the resource is distributed, the base station determines the combination capacity used by the URLLC service search space of the UE according to the UE capacity and the TTI period of the scheduling URLLC;
2. the base station determines the number of the public search spaces according to whether the base station supports the uplink/downlink preemption function or not;
3. and the base station determines the DCI scheduling format of the search space according to the function of the search space. When the service type is URLLC, selecting DCI Format 0_2/1_ 2; when the public search space is a downlink preemption function, selecting DCI Format 2_ 1; when the public search space is an uplink preemption function, selecting DCI Format 2_ 4;
4. the base station selects the symbol number of a control resource set CORESET for URLLC service according to the system capacity;
5. The base station determines the bandwidth of a URLLC service control resource set CORESET according to the number of public and special search spaces and the capability of UE for blind detection of PDCCH;
6. the base station determines the number of PDCCH candidates in each search space according to the number of the public and special search spaces and the capability of UE for blind detection of the PDCCH;
7. according to the result, the base station sends an RRC connection reconfiguration message to the UE, and the parameters of PDCCH-Config, ControlResourceSet and SearchSpace are configured for the UE at the same time.
8. When scheduling, the base station selects the DCI aggregation level according to CQI measurement and BLER statistics;
9. and the base station determines the distributed DCI position and whether the distribution is successful according to the priority of the scheduling UE list, the aggregation level, whether the rest CCEs exist or not, whether the preemption exists or not and the like.
In this embodiment, the base station uses a DCI Format 0_2/1_2 Format different from eMBB for the URLLC service, so that flexibility of individual scheduling of the URLLC service can be realized, and high reliability and low delay characteristics of the service can be ensured.
Moreover, the base station configures the core set and the SearchSpace different from the eMBB for the URLLC in the RRC signaling, so that the URLLC search space resource utilization rate is higher, and a larger aggregation level can be used to achieve the purpose of high reliability of the PDCCH.
Furthermore, the base station allocates corresponding PDCCH resources for each UE according to URLLC service characteristics and UE capability, supports the URLLC service to adopt a sub-slot (TTI takes a symbol as a period) scheduling strategy, supports the occupation of eMBB service resources, and can effectively ensure the URLLC service performance index of each UE.
In order to facilitate understanding of the present application by those skilled in the art, a downlink control channel resource allocation method in the embodiment of the present application will be described below with reference to fig. 3 to 5.
As shown in fig. 3, a flow diagram of a downlink control channel resource allocation method is provided, which includes the following steps:
step S301, determining the aggregation level required by the DCI message corresponding to the current TTI schedulable UE, wherein the aggregation level selection is that the base station selects the minimum aggregation level meeting the PDCCH demodulation performance according to the PDCCH channel quality indicated by the CQI and the BLER of the PDCCH, so that the demodulation performance and the capacity of the PDCCH can be optimized;
step S302, the uplink and downlink grouping scheduling lists are integrated into UeList according to the priority, wherein the priority order is self-defined by the base station, and the common DCI message (broadcasting, random access and paging) is superior to the functional type common DCI message (power distribution) and the downlink scheduling DCI are superior to the uplink scheduling DCI, or the common DCI message is superior to the service scheduling DCI (downlink and uplink cross distribution);
steps S303-S304 are carried out, and the available CCE is searched according to the aggregation level;
step S305 notifies the link packet scheduling unit of allocation of time-frequency domain resources to the UE to which the DCI allocation is successful. In the link grouping scheduling unit, if the time-frequency domain resources are sufficient, the resources can be directly allocated, if the time-frequency domain resources are insufficient and the system does not support uplink/downlink preemption, the DCI allocation failure can be fed back, and if the time-frequency domain resources are insufficient and the system supports uplink/downlink preemption, the eMBB resources can be preempted to allocate the DCI;
Step S306, for the UE which is not successfully allocated with the DCI, notifying a scheduling unit that the DCI allocation fails;
step S307, judging whether the system supports the uplink/downlink preemption, if not, executing step S309;
step S308, if the system supports the uplink/downlink preemption, the preempted UE is informed, the DCI is inserted into the first bit of the UeList to be distributed and is distributed firstly next, and the link packet scheduling unit determines whether the previous UE can use the preemption resource through the DCI distribution result obtained by feedback;
in step S309, the process ends after the UeList is distributed.
As shown in fig. 4, a flow chart of a search space configuration method is provided, which includes the following steps:
step S401, selecting a proper (X, Y) combination according to UE capability pdcch-MonitoringAnyOccasionins WithSpanGap and URLLC service scheduling period TTI;
step S402, configuring a search space period according to the combined X of the (X, Y);
step S403, selecting DCI Format 0_2/1_2 for the service scheduling search space 1, and if the downlink preemption function is supported, selecting DCI Format 2_1 for the public search space 2; if the uplink preemption function is supported, the public search space 3 selects DCI Format 2_ 4;
Step S404, determining the candidate number of PDCCH in each search space according to the number of the public and special search spaces and the capability of UE for blind detection of PDCCH;
step S405, according to the above result, the base station sends RRC connection reconfiguration message to the UE, and configures PDCCH-Config and SearchSpace parameters related to URLLC service for the UE.
As shown in fig. 5, a flow chart of a method for controlling resource set configuration is provided, which includes the following steps:
step S501, the base station selects the symbol number of a control resource set CORESET for URLLC service according to the system capacity;
step S502, determining the bandwidth of a URLLC service control resource set CORESET according to the number of public and special search spaces and the capability of UE for blind detection of PDCCH;
step S503, according to the above result, the base station sends RRC connection reconfiguration message to the UE, and configures PDCCH-Config and ControlResourceSet parameters for the UE.
It should be understood that although the various steps in the flow charts of fig. 2-5 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 2-5 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least some of the other steps.
In an embodiment, as shown in fig. 6, an apparatus for allocating downlink control channel resources is provided, including: a first obtaining module 610, a second obtaining module 620, and a resource allocating module 630, wherein:
a first obtaining module 610, configured to obtain candidate resources of the downlink control channel;
a second obtaining module 620, configured to obtain downlink control information of the second terminal when the first terminal occupies a data transmission channel of the second terminal;
a resource allocation module 630, configured to allocate a control information transmission resource for the downlink control information of the second terminal according to the candidate resource; the control information transmission resource is used for transmitting the downlink control information to the second terminal; the downlink control information of the second terminal is used for the second terminal to determine the data transmission channel again.
In an embodiment, the apparatus for allocating downlink control channel resources further includes:
a downlink control information acquisition module, configured to acquire at least one downlink control information; the downlink control information corresponds to a terminal;
a terminal list determining module, configured to determine a terminal list according to the priority order of the downlink control information;
A first terminal determining module, configured to determine the first terminal according to the terminal list;
a highest priority setting module, configured to set downlink control information of the second terminal to be a highest priority when the first terminal occupies a data transmission channel of the second terminal;
and the inserting module is used for inserting the second terminal into the terminal list according to the highest priority.
In an embodiment, the resource allocation module 630 is further configured to obtain a target aggregation level of the downlink control information of the second terminal; judging whether the candidate resources have unoccupied target resources with aggregation levels matched with the target aggregation levels; and if so, allocating the target resource to the second terminal.
In an embodiment, the first obtaining module 610 further includes:
a candidate resource parameter determining module, configured to determine a candidate resource parameter of the downlink control channel; the candidate resource parameter comprises at least one of a search space period, a downlink control information format, a candidate number of downlink control channels, a symbol number of a control resource set and a bandwidth of the control resource set;
and the candidate resource acquisition module is used for acquiring the candidate resources of the downlink control channel according to the candidate resource parameters.
In an embodiment, the candidate resource parameter determining module is further configured to obtain a terminal monitoring capability and a service scheduling period; determining a downlink control channel monitoring mode according to a preset lookup table through the terminal monitoring capability and the service scheduling period; determining the search space period according to the downlink control channel monitoring mode; the search space period corresponds to a symbol.
In an embodiment, the candidate resource parameter determining module is further configured to obtain a preemption function support condition; and determining the format of the downlink control information according to the supporting condition of the preemption function.
In an embodiment, the candidate resource parameter determining module is further configured to obtain the number of search spaces and a first blind detection capability; and obtaining the candidate number of the downlink control channels according to the ratio of the first blind detection capability to the number of the search spaces.
In an embodiment, the candidate resource parameter determining module is further configured to obtain a value range of the control resource set symbol number according to the downlink control channel monitoring mode; obtaining a system capacity index and a single symbol reachable index; determining a ratio between the system capacity indicator and the single sign reachable indicator; and if the ratio is within the value range, obtaining the number of the control resource set symbols according to the ratio.
In an embodiment, the candidate resource parameter determining module is further configured to obtain the number of search spaces and a second blind detection capability; obtaining the candidate number of the control channel units according to the ratio of the second blind detection capability to the number of the search spaces; and obtaining the bandwidth of the control resource set according to the ratio of the number of the control channel unit candidates to the number of the symbols of the control resource set.
For specific limitations of the downlink control channel resource allocation apparatus, reference may be made to the above limitations of the downlink control channel resource allocation method, which is not described herein again. All or part of each module in the downlink control channel resource allocation device can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the communication device, and can also be stored in a memory in the communication device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a communication device is provided, which may be a base station, and its internal structure diagram may be as shown in fig. 7. The communication device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the communication device is configured to provide computing and control capabilities. The memory of the communication device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the communication device is used for storing downlink control channel resource allocation data. The network interface of the communication device is used for connecting and communicating with an external terminal through a network. The computer program is executed by a processor to implement a downlink control channel resource allocation method.
Those skilled in the art will appreciate that the structure shown in fig. 7 is a block diagram of only a portion of the structure associated with the present application, and does not constitute a limitation on the communication devices to which the present application applies, and that a particular communication device may include more or fewer components than shown, or combine certain components, or have a different arrangement of components.
In one embodiment, a communication device is provided, which includes a memory and a processor, the memory storing a computer program, which when executed by the processor, causes the processor to perform the steps of the above-mentioned downlink control channel resource allocation method. Here, the steps of a method for allocating downlink control channel resources may be steps in a method for allocating downlink control channel resources in the foregoing embodiments.
In one embodiment, a computer readable storage medium is provided, which stores a computer program, and when the computer program is executed by a processor, the processor is caused to execute the steps of the above-mentioned downlink control channel resource allocation method. Here, the steps of a downlink control channel resource allocation method may be steps in a downlink control channel resource allocation method in the foregoing embodiments.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), for example.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (11)

1. A method for allocating downlink control channel resources is characterized in that the method comprises the following steps:
acquiring at least one downlink control message; the downlink control information corresponds to a terminal;
determining a terminal list according to the priority order of the downlink control information;
determining a first terminal according to the terminal list;
acquiring candidate resources of the downlink control channel;
when the first terminal occupies a data transmission channel of a second terminal, acquiring downlink control information of the second terminal, setting the downlink control information of the second terminal as the highest priority, and inserting the second terminal into the terminal list according to the highest priority;
distributing control information transmission resources for the second terminal downlink control information according to the candidate resources; the control information transmission resource is used for transmitting the downlink control information of the second terminal to the second terminal; the second terminal downlink control information is used for the second terminal to re-determine the data transmission channel.
2. The method according to claim 1, wherein the allocating control information transmission resources for the second terminal downlink control information according to the candidate resources comprises:
acquiring a target aggregation level of the downlink control information of the second terminal;
judging whether the candidate resources have unoccupied target resources with aggregation levels matched with the target aggregation levels;
and if so, allocating the target resource to the second terminal.
3. The method according to claim 1, wherein the obtaining the candidate resources of the downlink control channel comprises:
determining a candidate resource parameter of the downlink control channel; the candidate resource parameter comprises at least one of a search space period, a downlink control information format, a candidate number of downlink control channels, a symbol number of a control resource set and a bandwidth of the control resource set;
and obtaining the candidate resources of the downlink control channel according to the candidate resource parameters.
4. The method according to claim 3, wherein the determining the candidate resource parameter of the downlink control channel includes:
Acquiring terminal monitoring capacity and a service scheduling period;
determining a downlink control channel monitoring mode according to a preset lookup table through the terminal monitoring capability and the service scheduling period;
determining the search space period according to the downlink control channel monitoring mode; the search space period corresponds to a symbol.
5. The method according to claim 3, wherein the determining the candidate resource parameter of the downlink control channel further includes:
acquiring the supporting situation of the preemption function;
and determining the format of the downlink control information according to the supporting condition of the preemption function.
6. The method according to claim 3, wherein the determining the candidate resource parameter of the downlink control channel further includes:
acquiring the number of search spaces and first blind detection capability;
and obtaining the candidate number of the downlink control channels according to the ratio of the first blind detection capability to the number of the search spaces.
7. The method of claim 4, wherein the determining the candidate resource parameter of the downlink control channel further comprises:
Obtaining the value range of the symbol number of the control resource set according to the downlink control channel monitoring mode;
acquiring a system capacity index and a single symbol reachable index;
determining a ratio between the system capacity indicator and the single sign reachable indicator;
and if the ratio is within the value range, obtaining the number of the control resource set symbols according to the ratio.
8. The method of claim 7, wherein the determining the candidate resource parameter of the downlink control channel further comprises:
acquiring the number of search spaces and second blind detection capability;
obtaining the candidate number of the control channel units according to the ratio of the second blind detection capability to the number of the search spaces;
and obtaining the bandwidth of the control resource set according to the ratio of the candidate number of the control channel units to the symbol number of the control resource set.
9. An apparatus for allocating downlink control channel resources, the apparatus comprising:
a downlink control information acquisition module, configured to acquire at least one downlink control information; the downlink control information corresponds to a terminal;
a terminal list determining module, configured to determine a terminal list according to the priority order of the downlink control information;
The first terminal determining module is used for determining a first terminal according to the terminal list;
a first obtaining module, configured to obtain a candidate resource of the downlink control channel;
a second obtaining module, configured to obtain downlink control information of the second terminal when the first terminal occupies a data transmission channel of the second terminal;
a highest priority setting module, configured to set downlink control information of the second terminal to be a highest priority when the first terminal occupies a data transmission channel of the second terminal;
an inserting module, configured to insert the second terminal into the terminal list according to the highest priority;
a resource allocation module, configured to allocate a control information transmission resource for the second terminal downlink control information according to the candidate resource; the control information transmission resource is used for transmitting the downlink control information to the second terminal; the downlink control information of the second terminal is used for the second terminal to determine the data transmission channel again.
10. A communication device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor realizes the steps of the method of any of claims 1 to 8 when executing the computer program.
11. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 8.
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