CN112752348A - PDCCH scheduling method, base station and storage medium - Google Patents

PDCCH scheduling method, base station and storage medium Download PDF

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Publication number
CN112752348A
CN112752348A CN201911054401.4A CN201911054401A CN112752348A CN 112752348 A CN112752348 A CN 112752348A CN 201911054401 A CN201911054401 A CN 201911054401A CN 112752348 A CN112752348 A CN 112752348A
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pdcch
spectrum resource
candidate
target
target terminal
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张元博
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ZTE Corp
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ZTE Corp
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Priority to PCT/CN2020/121624 priority patent/WO2021082956A1/en
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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
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows

Abstract

The embodiment of the invention provides a PDCCH (physical Downlink control channel) scheduling method, a base station and a storage medium, wherein the base station determines that a target PDCCH (physical Downlink control channel) does not have frequency spectrum resource conflict with frequency spectrum resources occupied by other communication systems for a target terminal under a frequency spectrum sharing coexistence scene, and schedules the target terminal according to the target PDCCH, so that the target terminal can detect and analyze corresponding DCI (Downlink control information) more accurately and further respond according to the indication of the base station. The PDCCH scheduling scheme does not need to improve the CCE polymerization degree of the target terminal, so that the PDCCH scheduling is not carried out without additionally occupying spectrum resources, and spectrum resource units which are not suitable for PDCCH scheduling of the target terminal are eliminated as much as possible when the target PDCCH is determined, so that compared with a blind trying scheme in the related art, the interference of communication systems such as GSM and the like on the PDCCH in an LTE communication system can be effectively avoided.

Description

PDCCH scheduling method, base station and storage medium
Technical Field
The present invention relates to the field of communications, and in particular, to a PDCCH scheduling method, a base station, and a storage medium.
Background
Spectrum is a valuable resource in wireless communication, and since the birth of LTE (Long Term Evolution), there is spectrum sharing and coexistence between LTE and GSM (Global System for Mobile communication) or between LTE and UMTS (Universal Mobile Telecommunications System).
However, in a spectrum sharing and coexistence scenario, GSM or UMTS is highly likely to cause strong interference to a PDCCH (Physical Downlink Control Channel) in an LTE communication system, thereby causing a terminal to fail to parse DCI (Downlink Control Information). For this problem, the solutions in the related art are: the LTE communication system performs blind attempts by increasing CCE (Control Channel Element) aggregation levels of the terminals, but this approach wastes system resources and lacks efficiency.
Disclosure of Invention
The technical problem mainly solved by the PDCCH scheduling method, the base station and the storage medium provided by the embodiment of the invention is how to solve the problem that the base station affects the scheduling of the terminal because the PDCCH interferes in an LTE communication system in communication systems such as GSM and the like under the scene of spectrum sharing coexistence.
To solve the foregoing technical problem, an embodiment of the present invention provides a PDCCH scheduling method, including:
determining a mapping relation between a spectrum resource unit and a control channel unit (CCE) and an avoidance spectrum resource unit set, wherein the avoidance spectrum resource unit set is a set of spectrum resource units which are not suitable for target terminal PDCCH scheduling;
determining a target PDCCH (physical downlink control channel) for the target terminal from each candidate PDCCH of the target terminal according to the avoiding spectrum resource unit set and the mapping relation, wherein the candidate PDCCH comprises CCE (control channel element), the intersection of the target spectrum resource unit set corresponding to the target PDCCH and the avoiding spectrum resource unit set is empty, and the target spectrum resource unit set is a set of spectrum resource units corresponding to the CCE of the target PDCCH;
and scheduling the target terminal according to the target PDCCH.
The embodiment of the invention also provides a base station, which comprises a processor, a memory and a communication bus;
the communication bus is used for realizing connection communication between the processor and the memory;
the processor is configured to execute one or more programs stored in the memory to implement the steps of the above-described PDCCH scheduling method.
An embodiment of the present invention further provides a storage medium, where one or more programs are stored, and the one or more programs may be executed by one or more processors to implement the steps of the PDCCH scheduling method.
The invention has the beneficial effects that:
according to the PDCCH scheduling method, the base station and the storage medium provided by the embodiment of the invention, the base station determines the mapping relation between the spectrum resource units and the CCE, determines the spectrum resource units which are not suitable for the PDCCH scheduling of the target terminal, takes the collection of the spectrum resource units as the avoidance spectrum resource unit collection, and then determines the target PDCCH for the target terminal from each candidate PDCCH of the target terminal according to the avoidance spectrum resource unit collection and the mapping relation. Because the intersection of the target spectrum resource unit set corresponding to the target PDCCH and the avoidance spectrum resource unit set is empty, the target spectrum resource unit set corresponding to the target PDCCH certainly does not include the spectrum resources in the avoidance spectrum resource unit set. Therefore, the base station determines that the target PDCCH does not conflict with the frequency spectrum resources occupied by other communication systems for the target terminal under the scene of frequency spectrum sharing coexistence, and schedules the target terminal according to the target PDCCH, so that the target terminal can detect and analyze the corresponding DCI information more accurately and correctly, and then responses according to the indication of the base station. The PDCCH scheduling scheme does not need to improve the CCE polymerization degree of the target terminal, so that the PDCCH scheduling is not carried out without additionally occupying spectrum resources, and spectrum resource units which are not suitable for PDCCH scheduling of the target terminal are eliminated as much as possible when the target PDCCH is determined, so that compared with a blind trying scheme in the related art, the interference of communication systems such as GSM and the like on the PDCCH in an LTE communication system can be effectively avoided.
Additional features and corresponding advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a flowchart of a PDCCH scheduling method according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of a spectrum resource unit already occupied by other communication systems according to a first embodiment of the present invention;
fig. 3 is a flowchart illustrating a method for a base station to determine a set of back-off spectrum resource units according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a base station determining a target PDCCH for a target terminal according to a first method in a first embodiment of the present invention;
fig. 5 is a flowchart illustrating a base station determining a target PDCCH for a target terminal according to a second method in a first embodiment of the present invention;
fig. 6 is a flowchart of a PDCCH scheduling method according to a second example 1 of the present invention;
fig. 7 is a flowchart of a PDCCH scheduling method according to a second example 2 of the present invention;
fig. 8 is a flowchart of a PDCCH scheduling method according to a second example 3 of the present invention;
fig. 9 is a schematic hardware structure diagram of a base station according to a third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The first embodiment is as follows:
the spectrum sharing coexistence can improve the spectrum utilization rate, such as Magic Radio technology, nonstandard bandwidth technology, and the like. In addition to spectrum sharing between LTE and GSM or UMTS, with the arrival of 5G, there must be a great number of different forms of 4G and 5G joint networking in different stages of 5G network development, and under the scenario of coexistence of these different systems, how to share and maximize the utilization of spectrum resources is a topic of great concern for both communication operators and device vendors. To fully perform spectrum sharing or coexistence, the problem of spectrum resource conflict is mainly solved, that is, how to separate channels under different systems on physical resources, and the minimum waste is achieved. To this end, the present embodiment provides a PDCCH scheduling method, please refer to a flowchart of the PDCCH scheduling method shown in fig. 1:
s102: and the base station determines the mapping relation between the spectrum resource units and the CCE and avoids the spectrum resource unit set.
The "spectrum Resource unit" refers to a spectrum Resource obtained by dividing a spectrum bandwidth according to a certain fixed granularity, for example, in some examples of this embodiment, the spectrum Resource unit may be any one of an RB (Resource Block ), an REG (Resource Element Group, Resource Element Group), and an RE (Resource Element). Since the granularity of partitioning is usually fixed, the spectrum resource unit may also be a unit of measure, such as one RB, two REGs, etc. Wherein one RB corresponds to 84 REs and one REG corresponds to 4 REs.
When the LTE communication system shares a spectrum with the GSM communication system, since one carrier of GSM is substantially equivalent to one RB, if it is in this scenario, the spectrum resource unit may be referred to as an RB. Of course, those skilled in the art will understand that, in other examples of the present embodiment, the spectrum resource unit may also be a REG or an RE.
In this embodiment, a mapping relationship exists between spectrum resource elements and CCEs, one CCE may correspond to one or more spectrum resource elements, and the relationship between the CCEs and the spectrum resource elements may characterize on which spectrum resource element or elements the CCE transmits DCI. Alternatively, the existing mapping relationship between the spectrum resource units and the CCEs can be generated by the base station based on the algorithm of mapping the physical resources of the channel of the 3GPP protocol TS36.211PDCCH and the algorithm of interleaving the sub-blocks in TS 36.212. For the NR communication system, the mapping relationship between the spectrum resource units and the CCEs is generated based on a corresponding TS 38 series protocol algorithm.
The "avoidance spectrum resource unit set" refers to a set of spectrum resource units that are not suitable for PDCCH scheduling of the target terminal, that is, a set of spectrum resource units that need to be avoided from being selected and are not recommended to be selected when the base station needs to select the spectrum resource units to transmit DCI to the target terminal. It is to be understood that the set of back-off spectrum resource units may include only one spectrum resource unit, or may include two or more spectrum resource units.
In some examples of this embodiment, the spectrum resource unit that is not suitable for PDCCH scheduling of the target terminal may refer to a spectrum resource unit that is already occupied by other communication systems, for example, the LTE communication system shares a spectrum with the GSM communication system, and the spectrum resource unit that is already occupied by the GSM communication system in the shared spectrum belongs to a spectrum resource unit that needs to be avoided when the PDCCH is determined for the target terminal by the LTE communication system, because if the PDCCH determined by the LTE communication system includes such a spectrum resource unit that is already occupied by the GSM communication system, it is very likely that the DCI terminal side that is transmitted on such a spectrum resource unit cannot correctly receive and resolve due to interference of GSM. Please refer to fig. 2, which shows a schematic diagram of spectrum resource units already occupied by other communication systems:
in fig. 2, RBs 1 … … RB81 and the like, which are indicated as white-backed black-shaded background RBs, correspond to CCE0, while RBs 4 … … RB89 and the like, which are indicated as white-backed black-shaded background RBs, correspond to CCE1 in the mapping relationship, while RBs with thick dotted lines are RBs occupied by GSM, and therefore, in fig. 2, RB81 belongs to a spectrum resource element already occupied by other communication systems that is not suitable for PDCCH scheduling for a target terminal.
It should be noted that, in this embodiment, a spectrum resource unit "occupied by other communication systems" is not equal to that the spectrum resource unit is currently used by other communication systems, for example, assuming that the LTE communication system shares a spectrum with an NR (New Radio, New air interface) communication system, when the LTE communication system determines a PDCCH for a terminal, only those spectrum resource units that are to be used by the NR communication system are reserved and added to an avoidance spectrum resource set.
In some examples of the present embodiment, if the spectrum resource units unsuitable for PDCCH scheduling of the target terminal include spectrum resource units occupied by other communication systems, the process of the base station determining to dodge the spectrum resource unit set may refer to a flow shown in fig. 3:
s302: the base station acquires frequency band occupation information of other communication systems which share the frequency band with the communication system in the shared frequency band;
s304: and the base station determines an avoidance spectrum resource unit set according to the frequency band occupation information.
Alternatively, the communication system may be any one of an LTE communication system and a communication system after the LTE communication system, such as an NR communication system, or any future communication system. The other communication system may be any communication system, such as a GSM communication system, an NR communication system or a UMTS communication system.
In some other examples of the present embodiment, the spectrum resource unit unsuitable for PDCCH scheduling of the target terminal may refer to a spectrum resource unit already allocated to other terminals except the target terminal, and this scenario mainly exists in a scenario applying a non-standard bandwidth technology: generally, a standard bandwidth may be any one of 1.8M, 3.4M, 5M, 10M, and 20M, but the size of a non-standard bandwidth is not so fixed, and the value size is flexible, for example, it may be 16M, 18M, and so on. However, the non-standard bandwidth is only allocated for the traffic channel, and the PDCCH channel cannot be adjusted to the non-standard bandwidth accordingly, so the CCE allocation is still allocated in the closest standard bandwidth spectrum, which results in that it is highly possible to allocate the "out-of-band" bandwidth of the non-standard bandwidth to the target terminal, that is, the base station is likely to use the bandwidth originally allocated to the terminal other than the target terminal for PDCCH scheduling of the target terminal. In order to solve such a problem, in this embodiment, such spectrum resource units allocated to other than the target terminal under the non-standard bandwidth are also added to the avoidance spectrum resource set as spectrum resource units that are not suitable for PDCCH scheduling of the target terminal.
It should be appreciated that in some examples, the set of back-off spectrum resources may include only spectrum resource units already occupied by other communication systems, and in other examples, the set of back-off spectrum resources may include only spectrum resource units already allocated to other terminals than the target terminal. In still other examples, the avoiding spectrum resource set may include the two spectrum resource units that are not suitable for PDCCH scheduling of the target terminal.
S104: and the base station determines a target PDCCH for the target terminal from all candidate PDCCHs of the target terminal according to the avoiding frequency spectrum resource unit set and the mapping relation.
In this embodiment, the PDCCH finally used for PDCCH scheduling determined by the base station for a terminal is referred to as a "target PDCCH", and it is understood that when the base station determines the target PDCCH for a terminal, the PDCCH candidate may be selected from one or more "candidate PDCCHs", each PDCCH candidate characterizes a position for PDCCH scheduling for the terminal, and each PDCCH candidate includes one or more CCEs, for example, in an example, PDCCH candidate 1 includes CCE0 and CCE2, and PDCCH candidate 2 includes CCE1 and CCE 2. As can be seen from the foregoing description, one CCE may correspond to one or more spectral resource elements, and thus each PDCCH candidate may correspond to different spectral resource elements. In this embodiment, a set of spectrum resource elements corresponding to the CCE of the target PDCCH is referred to as a "target spectrum resource element set", and correspondingly, a set of spectrum resource elements corresponding to the CCE of each candidate PDCCH is a "candidate spectrum resource element set" of the candidate PDCCH.
In this embodiment, the intersection of the target spectrum resource unit set and the avoidance spectrum resource unit set is required to be empty, so that it can be ensured that any one spectrum resource unit in the avoidance spectrum resource unit set is included in the middle of the target spectrum resource unit set, and thus the base station does not generate resource conflict with other communication systems or other terminals when scheduling the target terminal according to the target PDCCH.
Two ways to determine the target PDCCH from the candidate PDCCHs are provided below:
in the first mode, a target PDCCH is directly determined according to an avoidance spectrum resource set: the base station determines a candidate frequency spectrum resource unit set corresponding to the candidate PDCCH of the target terminal according to the mapping relation, and then selects the candidate PDCCH with the empty intersection of the candidate frequency spectrum resource unit set and the avoidance frequency spectrum resource unit set as the target PDCCH.
It can be understood that, when the base station determines the candidate spectrum resource unit sets corresponding to the candidate PDCCHs of the target terminal according to the mapping relationship, the base station may simultaneously determine the candidate spectrum resource unit sets corresponding to all the candidate PDCCHs of the target terminal, for example, assuming that the target terminal has four candidate PDCCHs a, b, c, and d, the base station may determine the candidate spectrum resource unit sets S corresponding to the four candidate PDCCHs togethera、Sb、Sc、SdAre determined. Then from Sa、Sb、Sc、SdAnd selecting an intersection of the candidate spectrum resource unit set and the avoidance spectrum resource unit set as a null one, and taking the candidate PDCCH corresponding to the candidate spectrum resource unit set as a target PDCCH. In other examples of this embodiment, the base station may also determine only a set of candidate spectrum resource units corresponding to a part of candidate PDCCHs at a time, determine whether the part of candidate PDCCHs can be used as target PDCCHs first, and if so, directly select the candidate PDCCH without determining a set of candidate spectrum resource units of other candidate PDCCHs. For example, in an example of the present embodiment, please refer to the flowchart shown in fig. 4:
s402: one of the candidate PDCCHs of the target terminal is selected as a current candidate.
S404: and determining a candidate frequency spectrum resource unit set corresponding to the current candidate according to the mapping relation.
In this example, when determining a target PDCCH for a target terminal, the base station determines, each time, to select only one candidate PDCCH from the candidate PDCCHs that have not been selected as a current candidate, and determines a set of candidate spectrum resource units corresponding to the current candidate. That is, the base station determines only the candidate spectrum resource set corresponding to one candidate PDCCH at a time, not the candidate spectrum resource sets of multiple candidate PDCCHs, nor the candidate spectrum resource sets of all candidate PDCCHs.
S406: and judging whether the candidate frequency spectrum resource unit set and the avoidance frequency spectrum resource unit set have intersection or not.
If so, performing S402 to reselect one candidate PDCCH from the not-currently selected candidate PDCCH as the current candidate, otherwise performing S408.
S408: the current candidate is directly taken as the target PDCCH.
If the base station determines that there is no intersection between the candidate spectrum resource unit set corresponding to the current candidate and the avoidance spectrum resource unit set through judgment, that is, the candidate spectrum resource unit set does not include the spectrum resource unit in the spectrum resource unit set, therefore, if the base station uses the current candidate as the target PDCCH, the base station is not affected by other communication systems or other terminals when the base station schedules the target terminal, and the target terminal side can correctly receive and analyze the DCI of the base station.
And secondly, determining a target PDCCH according to the avoidance CCE set: and determining an avoidance CCE set corresponding to the avoidance spectrum resource set according to the mapping relation, and selecting a candidate PDDCH of the corresponding CCE not containing the CCE in the avoidance CCE set as a target PDCCH for the target terminal.
In some examples of this embodiment, after determining the avoidance spectrum resource element set, the base station may determine an avoidance CCE set according to a mapping relationship between the spectrum resource element and a CCE, where the avoidance CCE set is also a set of CCEs that is not suitable for target PDCCH scheduling. In these examples, after the base station determines the set of avoided CCEs, it is not necessary to pay attention to the relationship between the spectrum resource units corresponding to the candidate PDCCHs and the spectrum resource units in the set of avoided spectrum resource units, please refer to a flowchart of fig. 5 for selecting a target PDCCH according to the second method:
s502: and determining to avoid the CCE set according to the mapping relation.
S504: and selecting one candidate PDCCH from the candidate PDCCHs of the target terminal as a current candidate, and determining a candidate CCE set corresponding to the current candidate.
The set of candidate CCEs is a set of CCEs corresponding to a candidate PDCCH.
S506: and judging whether the intersection of the candidate CCE set and the avoidance CCE set is empty or not.
If yes, go to step S508, otherwise, go to step S504.
If the judgment result is negative, the candidate CCE set comprises at least one CCE in the avoidance CCE set, so that the candidate PDCCH is not suitable for being used as a target PDCCH to schedule the target terminal, and if the judgment result is positive, the candidate CCE set does not comprise any CCE in the avoidance CCE set, so that the current candidate can be used as the target PDCCH.
S508: the current candidate is directly taken as the target PDCCH.
Because the intersection of the candidate CCE set corresponding to the current candidate and the avoidance CCE set is empty, if the base station takes the current candidate as the target PDCCH, the base station is not influenced by other communication systems or other terminals when the base station schedules the target terminal, and the target terminal side can correctly receive and analyze the DCI of the base station.
It can be understood that, although the first and second manners are different in flow, the principles of the first and second manners in selecting the target PDCCH are consistent, and both are to enable the base station to avoid the spectrum resource units already occupied by other communication systems or the spectrum resource units already allocated to other terminals when selecting the target PDCCH for the target terminal, so as to avoid the spectrum resource collision with other communication systems when scheduling the PDCCH for the target terminal.
S106: and the base station schedules the target terminal according to the target PDCCH.
After determining the target PDCCH, the base station may schedule the target terminal according to the target PDCCH.
It is understood that although a target terminal may correspond to a plurality of candidate PDCCHs, even then, the base station may not select a qualified target PDCCH from the candidate PDCCHs, because each candidate PDCCH of the target terminal may correspond to a spectrum resource unit in the set of avoided spectrum resource units. In this case, the base station may cancel the scheduling of the target terminal this time, and increase the CCE aggregation level of the target terminal to wait for the next scheduling slot. The CCE aggregation level refers to the number of CCEs in the PDCCH.
The PDCCH scheduling method provided by this embodiment can effectively avoid interference caused by other communication systems or other terminals in a scenario where spectrum sharing coexists, and ensure effective scheduling of the base station side to the terminal without additionally occupying spectrum resources, which is beneficial to improving spectrum resource utilization rate and improving throughput of the communication system.
Example two:
in order to make the advantages and details of the PDCCH scheduling method provided by the embodiment of the present invention more clear to those skilled in the art, the present embodiment will continue to describe the PDCCH scheduling method in the foregoing embodiment with reference to the following example:
example 1-application of PDCCH scheduling method in LTE and GSM communication system spectrum sharing scenarios:
in a scenario of spectrum sharing between an LTE communication system and a GSM communication system, since mapping from CCEs to REGs in the LTE communication system is interleaved within a full bandwidth, a PDCCH channel cannot avoid a spectrum where a GSM carrier is located, so that the GSM communication system may generate strong interference on a PDCCH at the spectrum position, resulting in failure in DCI analysis. It is now common practice for LTE communication systems to perform blind attempts by raising the CCE aggregation level. However, this solution is both wasteful of system resources and inefficient. Moreover, if the number of carriers of the shared GSM communication system is large, the number of blind attempts increases, and the system performance deteriorates rapidly. As a result, the degree of aggregation repeatedly changes, false detection of DCI by the UE side increases, the number of UEs that can be scheduled by the base station within a certain period of time decreases, and the system capacity and throughput decrease. This is also the reason for the negative gain in most spectrum sharing scenarios. To address these issues, the present example provides a PDCCH scheduling method, please refer to the flowchart shown in fig. 6:
s602: after the LTE communication system is started, the base station calculates and generates a mapping relation table from CCE to RB according to a protocol algorithm.
S604: a base station in an LTE communication system determines an RB bit map (RB bitmap) which needs to be avoided by the LTE system according to the acquired frequency spectrum of the GSM shared carrier.
S606: and when the base station searches the PDCCH candidate set of the UE to allocate PDCCH resources for the UE, selecting one candidate PDCCH, and searching the corresponding RB in the mapping relation table by using the corresponding CCE.
S608: and the base station judges whether the RB corresponding to the CCE in the candidate PDCCH exists in the RB bit map.
If yes, go to step S612, otherwise go to step S610.
S610: the candidate PDCCH is set as a target PDCCH, and scheduling of the UE is performed.
S612: and judging whether candidate PDCCHs which are not selected yet exist in the PDCCH candidate set of the UE.
If yes, go to step S606, otherwise go to step S614.
S614: and canceling the current scheduling of the UE, improving the CCE polymerization degree of the UE, and waiting for the next scheduling time slot.
Example 2-application of PDCCH scheduling method in non-standard bandwidth technology scenarios:
in an LTE communication system applying the non-standard bandwidth technology, a PDCCH channel cannot be adjusted to a non-standard bandwidth, so CCE allocation is still allocated in a closest standard bandwidth spectrum, and if the CCE channel is allocated to a non-standard out-of-band, a problem of DCI parsing failure may occur on the UE side. The same common solution is then to try blindly by improving the CCE aggregation level of the PDCCH in LTE. However, this also causes problems such as erroneous detection or missed detection of DCI at the UE side, and a reduction in the number of UEs scheduled by the base station, which leads to a reduction in system capacity and performance. In contrast, the PDCCH scheduling method provided in this embodiment is as shown in fig. 7:
s702: after the LTE communication system is started, the base station calculates and generates a mapping relation table from CCE to REG according to a protocol algorithm.
S704: the base station calculates a REG position REG bit map (REG bitmap) corresponding to the out-of-band spectrum according to the relation between the current non-standard bandwidth and the standard bandwidth.
S706: and when the base station searches the PDCCH candidate set of the UE to allocate PDCCH resources to the UE, selecting one candidate PDCCH, and searching the corresponding REG in the mapping relation table by using the corresponding CCE.
S708: the base station judges whether the REG corresponding to the CCE in the candidate PDCCH exists in the REG bit map.
If yes, go to step S612, otherwise go to step S610.
S710: the candidate PDCCH is set as a target PDCCH, and scheduling of the UE is performed.
S712: and judging whether candidate PDCCHs which are not selected yet exist in the PDCCH candidate set of the UE.
If yes, go to step S706, otherwise go to step S714.
S714: and canceling the current scheduling of the UE, improving the CCE polymerization degree of the UE, and waiting for the next scheduling time slot.
Example 3-application of PDCCH scheduling method in LTE and NR communication system spectrum sharing scenarios:
in spectrum sharing between an LTE communication system and an N R communication system, when the number of users in the LTE communication system is small or the number of users in the NR communication system is small, if a scheme for isolating a control channel in a frequency domain is selected, the problem of intersystem interference caused by REG interleaving in PDCCH allocation still needs to be solved. In this regard, please refer to the flow chart shown in fig. 8:
s802: and after the NR communication system is started, the base station calculates and generates a mapping relation table from CCE to REG according to a protocol algorithm.
S804: and the base station in the NR communication system determines the REG bit map which needs to be avoided by the NR system according to the acquired frequency spectrum of the LTE shared carrier.
S806: and when the base station searches the PDCCH candidate set of the UE to allocate PDCCH resources to the UE, selecting one candidate PDCCH, and searching the corresponding REG in the mapping relation table by using the corresponding CCE.
S808: the base station judges whether the REG corresponding to the CCE in the candidate PDCCH exists in the REG bit map.
If yes, then S812 is executed, otherwise S810 is executed.
S810: the candidate PDCCH is set as a target PDCCH, and scheduling of the UE is performed.
S812: and judging whether candidate PDCCHs which are not selected yet exist in the PDCCH candidate set of the UE.
If yes, go to step S806, otherwise go to step S814.
S814: and canceling the current scheduling of the UE, improving the CCE polymerization degree of the UE, and waiting for the next scheduling time slot.
Example three:
in this embodiment, the storage medium may store a PDCCH scheduling program, and the PDCCH scheduling program may be used by the one or more processors to execute a procedure for implementing any one of the PDCCH scheduling methods described in the foregoing embodiments.
In addition, the present embodiment provides a base station, as shown in fig. 9: the base station 90 comprises a processor 91, a memory 92 and a communication bus 93 for connecting the processor 91 and the memory 92, wherein the memory 92 may be the aforementioned storage medium storing the PDCCH scheduler. The processor 91 may read the PDCCH scheduling program, compile and execute the procedures for implementing the PDCCH scheduling method described in the foregoing embodiments:
the processor 91 determines a mapping relationship between the spectrum resource units and the CCE and an avoidance spectrum resource unit set, and then determines a target PDCCH for the target terminal from candidate PDCCHs of the target terminal according to the avoidance spectrum resource unit set and the mapping relationship, where an intersection of the target spectrum resource unit set corresponding to the target PDCCH and the avoidance spectrum resource unit set is empty. After determining the target PDCCH, the processor 91 schedules the target terminal according to the target PDCCH.
In some examples of the present embodiment, the spectrum resource units unsuitable for PDCCH scheduling of the target terminal include: at least one of spectrum resource units occupied by other communication systems and spectrum resource units already allocated to other terminals than the target terminal.
If the spectrum resource units unsuitable for PDCCH scheduling of the target terminal include spectrum resource units occupied by other communication systems, the processor 91 may obtain frequency band occupation information in a shared frequency band of other communication systems having a shared frequency band with the communication system when determining the set of avoidance spectrum resource units, and then determine the set of avoidance spectrum resource units according to the frequency band occupation information.
Optionally, the "present communication system" is any one of a long term evolution LTE communication system and a communication system after the LTE communication system; the "other communication system" is any communication system.
Optionally, the spectrum resource unit is any one of an RB, an REG, and an RE.
After determining a target PDCCH for the target terminal from each candidate PDCCH of the target terminal according to the set of avoidance spectrum resource units and the mapping relationship, if there is no target PDCCH meeting the conditions in each candidate PDCCH of the target terminal, the processor 91 cancels the current scheduling for the target terminal, improves the CCE polymerization degree of the target terminal, and waits for the next scheduling time slot.
In some examples of the present embodiment, the determining, by the processor 91, the target PDCCH for the target terminal from candidate PDCCHs of the target terminal according to the set of avoided spectrum resource elements and the mapping relationship includes any one of the following manners:
the first method is as follows:
the processor 91 determines a candidate frequency spectrum resource unit set corresponding to the candidate PDCCH of the target terminal according to the mapping relation, and then the processor 91 selects the candidate PDCCH with the empty intersection of the candidate frequency spectrum resource unit set and the avoidance frequency spectrum resource unit set as the target PDCCH;
the second method comprises the following steps:
the processor 91 determines an avoidance CCE set corresponding to the avoidance spectrum resource set according to the mapping relationship, and then selects, as the target PDCCH, a candidate PDDCH, which does not include a CCE in the avoidance CCE set, for the target terminal.
If the processor 91 determines the target PDCCH for the target terminal according to the first method, the processor 91 may select one candidate PDCCH from candidate PDCCHs of the target terminal as a current candidate, and then determine a candidate spectrum resource unit set corresponding to the current candidate according to the mapping relationship. Subsequently, the processor 91 determines whether an intersection exists between the candidate spectrum resource unit set and the avoidance spectrum resource unit set; if so, determining the current candidate and the corresponding candidate frequency spectrum resource unit set for the target terminal again until the intersection of the candidate frequency spectrum resource unit set and the avoidance frequency spectrum resource unit set is empty; and if not, directly taking the current candidate as the target PDCCH.
For other details of implementing the PDCCH scheduling method by the base station, please refer to the description of the foregoing embodiments, which are not described herein again.
In the base station provided by this embodiment, because the CCE aggregation level of the target terminal does not need to be increased, not only is the PDCCH scheduling performed without additionally occupying spectrum resources, but also spectrum resource units that are not suitable for PDCCH scheduling of the target terminal are excluded as much as possible when the target PDCCH is determined, so that interference of communication systems such as GSM and the like on the PDCCH in the LTE communication system can be effectively avoided compared with a blind trying scheme in the related art.
It will be apparent to those skilled in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software (which may be implemented in program code executable by a computing device), firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed over computer-readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media), executed by a computing device, and in some cases may perform the steps shown or described in a different order than here. The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art. Thus, the present invention is not limited to any specific combination of hardware and software.
The foregoing is a more detailed description of embodiments of the present invention, and the present invention is not to be considered limited to such descriptions. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims (10)

1. A PDCCH scheduling method comprises the following steps:
determining a mapping relation between a spectrum resource unit and a control channel unit (CCE) and an avoidance spectrum resource unit set, wherein the avoidance spectrum resource unit set is a set of spectrum resource units which are not suitable for target terminal PDCCH scheduling;
determining a target PDCCH (physical downlink control channel) for the target terminal from each candidate PDCCH of the target terminal according to the avoiding spectrum resource unit set and the mapping relation, wherein the candidate PDCCH comprises CCE (control channel element), the intersection of the target spectrum resource unit set corresponding to the target PDCCH and the avoiding spectrum resource unit set is empty, and the target spectrum resource unit set is a set of spectrum resource units corresponding to the CCE of the target PDCCH;
and scheduling the target terminal according to the target PDCCH.
2. The PDCCH scheduling method of claim 1, wherein the spectral resource units unsuitable for PDCCH scheduling of a target terminal comprise: at least one of spectrum resource units occupied by other communication systems and spectrum resource units already allocated to other terminals than the target terminal.
3. The PDCCH scheduling method according to claim 1, wherein if the spectrum resource units unsuitable for PDCCH scheduling of the target terminal include spectrum resource units occupied by other communication systems, determining the set of avoidance spectrum resource units comprises:
acquiring frequency band occupation information of other communication systems which share a frequency band with the communication system in the shared frequency band;
and determining the avoidance spectrum resource unit set according to the frequency band occupation information.
4. The PDCCH scheduling method of claim 3, wherein the local communication system is any one of a Long Term Evolution (LTE) communication system and a communication system subsequent to the LTE communication system; the other communication system is any communication system.
5. The PDCCH scheduling method according to claim 1, wherein the spectrum resource unit is any one of a resource block, RB, a resource element group, REG, and a resource element, RE.
6. The PDCCH scheduling method according to claim 1, wherein after determining a target PDCCH for the target terminal from candidate PDCCHs of the target terminal according to the set of avoided spectral resource elements and the mapping relationship, the PDCCH scheduling method further comprises:
and if the target PDCCH meeting the conditions does not exist in the candidate PDCCHs of the target terminal, canceling the scheduling of the target terminal, improving the CCE polymerization degree of the target terminal, and waiting for the next scheduling time slot.
7. The method for scheduling the PDCCH according to any one of claims 1 to 6, wherein the determining the target PDCCH for the target terminal from the candidate PDCCHs of the target terminal according to the set of avoided spectral resource elements and the mapping relationship comprises any one of the following manners:
the first method is as follows:
determining a candidate frequency spectrum resource unit set corresponding to the target terminal candidate PDCCH according to the mapping relation;
selecting a candidate PDCCH with an empty intersection of the candidate spectrum resource unit set and the avoidance spectrum resource unit set as the target PDCCH;
the second method comprises the following steps:
determining an avoidance CCE set corresponding to the avoidance spectrum resource unit set according to the mapping relation;
and selecting the candidate PDDCH of which the corresponding CCE does not contain the CCE in the avoidance CCE set as the target PDCCH for the target terminal.
8. The PDCCH scheduling method of claim 7, wherein the determining the set of candidate spectrum resource elements corresponding to the target terminal candidate PDCCH according to the mapping relationship comprises:
selecting one of candidate PDCCHs of the target terminal as a current candidate;
determining a candidate frequency spectrum resource unit set corresponding to the current candidate according to the mapping relation;
the selecting, as the target PDCCH, the candidate PDCCH whose intersection of the candidate spectrum resource unit set and the avoidance spectrum resource unit set is empty includes:
judging whether the candidate frequency spectrum resource unit set and the avoidance frequency spectrum resource unit set have intersection or not;
if so, determining the current candidate and the corresponding candidate frequency spectrum resource unit set for the target terminal again until the intersection of the candidate frequency spectrum resource unit set and the avoidance frequency spectrum resource unit set is empty;
and if not, directly taking the current candidate as the target PDCCH.
9. A base station comprising a processor, a memory, and a communication bus;
the communication bus is used for realizing connection communication between the processor and the memory;
the processor is configured to execute one or more programs stored in the memory to implement the steps of the PDCCH scheduling method according to any of claims 1 to 8.
10. A storage medium storing one or more programs, the one or more programs being executable by one or more processors to implement the steps of the PDCCH scheduling method according to any one of claims 1 to 8.
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