CN114258036A - Frame structure configuration method, device and storage medium - Google Patents
Frame structure configuration method, device and storage medium Download PDFInfo
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Abstract
The invention discloses a frame structure configuration method, a device and a storage medium, wherein the frame structure configuration method comprises the following steps: dividing a cell group; base stations configuring the same cell group use the same configured flexible frame structure. By adopting the invention, the cross time slot interference among the cells in the group is avoided. The method can be easily applied to 5G hot spot scenes or scenes in which the 5G hot spots coexist with vertical industries.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a frame structure configuration method, an apparatus, and a storage medium.
Background
For the 5G hotspot networking scheme, the current mainstream scheme is to use the configuration of dynamic TDD (Time Division Duplex). The NR (New Radio) TDD system may be configured dynamically in units of time slots or symbols through DCI (Downlink Control Information). Flexible time slots can be configured through time slot format combination; through the DCI information, in each slot, each symbol may be configured as an uplink (U), a downlink (D), or a flexible symbol (F) according to a scheduling condition, as shown in table 1.
Table 1: slot format under normal CP (Cyclic Prefix)
The frame structure of dynamic TDD is more flexible and can better match services, so that the system capacity is larger. However, dynamic TDD also introduces a new problem, namely cross-slot interference. Since each base station dynamically configures a frame structure according to its own service condition, it is likely that the transmission directions of two adjacent or nearby base stations are inconsistent within a certain time period, and then a base station transmitting downlink will cause severe cross slot interference to a base station transmitting uplink, fig. 1 is a schematic diagram of cross slot interference, as shown in fig. 1.
As can be seen, for the existing dynamic TDD networking scheme, flexible uplink and downlink configuration can meet the capacity requirement, but also brings the problem of cross timeslot interference.
The problems of the prior art are as follows: the existing solutions for solving the cross time slot interference are all based on protocol modification as a premise, and the implementation schemes are complex.
Disclosure of Invention
The invention provides a frame structure configuration method, a frame structure configuration device and a storage medium, which are used for solving the problem of cross time slot interference in a networking scheme of dynamic TDD.
The invention provides the following technical scheme:
a frame structure configuration method, comprising:
dividing a cell group;
base stations configuring the same cell group use the same configured flexible frame structure.
In the implementation, the cells divided into the same cell group are the cells with the uplink and downlink service proportion in a preset interval in a statistical period.
In the implementation, after the cell groups are divided, the flexible frame structure adjustment of each cell group is triggered by an event, or is triggered by an event in a long period.
In the implementation, one or the combination of the following modes is further included:
monitoring the service flow of each cell, and if the capacity of a certain cell is not limited and the current configuration is not the initial configuration, returning a time slot to X by the frame structure of all the cells;
monitoring the service flow of each cell, and if monitoring that the uplink capacity of a certain cell is limited, when no X time slot exists, no flow monitoring and/or no frame structure adjustment is carried out in the current adjustment period;
monitoring the service flow of each cell, if monitoring that the uplink capacity of a certain cell is limited, adjusting the last X time slot in each uplink and downlink conversion period to be a U time slot when more than one X time slot exists;
monitoring the service flow of each cell, if monitoring that the uplink capacity of a certain cell is limited, adjusting the X time slot in each uplink and downlink conversion period to be the time slot of the action master when only one X time slot exists;
monitoring the service flow of each cell, and if monitoring that the downlink capacity of a certain cell is limited, when no X time slot exists, no flow monitoring and/or no frame structure adjustment is performed in the current adjustment period;
monitoring the service flow of each cell, and if the limitation of the downlink capacity of a certain cell is monitored, adjusting the last X time slot in each uplink and downlink conversion period to be a D time slot when more than one X time slot exists;
monitoring the service flow of each cell, if monitoring that the downlink capacity of a certain cell is limited, if only one X time slot exists, adjusting the X time slot in each uplink and downlink conversion period to be the time slot mainly based on the following behavior.
In an implementation, after the time slot adjustment, the method further includes:
other cells within the cell group are notified to make the same adjustment.
In an implementation, the method further comprises the following steps:
and determining whether to adjust the flexible frame structure of the cell group according to the capacity limit condition of each cell in the cell group.
In an implementation, the method further comprises the following steps:
before adjusting the frame structure of the cell group, when the flexible frame structures used by other cell groups are determined to be not matched according to the stored frame structure matching relationship, adjusting the flexible frame structure of the cell group; and/or the presence of a gas in the gas,
and after the cell group adjusts the frame structure, when the interference level between the cell group and other cell groups exceeds a preset threshold, returning the adjusted frame structure to the position before adjustment.
In the implementation, the flexible frame structure used by other cell groups is obtained through information interaction between the cell groups or obtained through OMC.
In an implementation, the method further comprises the following steps:
and acquiring the flexible frame structures used by other cell groups in a preset period, wherein only one cell group acquires the flexible frame structures used by other cell groups in one period.
In an implementation, the method further comprises the following steps:
when monitoring the interference level between the cell group and other cell groups, if the interference level exceeds a preset threshold, negotiating the used flexible frame structure with other cell groups with interference.
In an implementation, the method further comprises the following steps:
and determining whether to adjust the flexible frame structure of the cell group according to the capacity limited condition of the cell group level.
A frame structure configuration apparatus, comprising:
a processor for reading the program in the memory, performing the following processes:
dividing a cell group;
the base stations configuring the same cell group use the same configuration of flexible frame structure;
a transceiver for receiving and transmitting data under the control of the processor.
In the implementation, the cells divided into the same cell group are the cells with the uplink and downlink service proportion in a preset interval in a statistical period.
In the implementation, after the cell groups are divided, the flexible frame structure adjustment of each cell group is triggered by an event, or is triggered by an event in a long period.
In the implementation, one or the combination of the following modes is further included:
monitoring the service flow of each cell, and if the capacity of a certain cell is not limited and the current configuration is not the initial configuration, returning a time slot to X by the frame structure of all the cells;
monitoring the service flow of each cell, and if monitoring that the uplink capacity of a certain cell is limited, when no X time slot exists, no flow monitoring and/or no frame structure adjustment is carried out in the current adjustment period;
monitoring the service flow of each cell, if monitoring that the uplink capacity of a certain cell is limited, adjusting the last X time slot in each uplink and downlink conversion period to be a U time slot when more than one X time slot exists;
monitoring the service flow of each cell, if monitoring that the uplink capacity of a certain cell is limited, adjusting the X time slot in each uplink and downlink conversion period to be the time slot of the action master when only one X time slot exists;
monitoring the service flow of each cell, and if monitoring that the downlink capacity of a certain cell is limited, when no X time slot exists, no flow monitoring and/or no frame structure adjustment is performed in the current adjustment period;
monitoring the service flow of each cell, and if the limitation of the downlink capacity of a certain cell is monitored, adjusting the last X time slot in each uplink and downlink conversion period to be a D time slot when more than one X time slot exists;
monitoring the service flow of each cell, if monitoring that the downlink capacity of a certain cell is limited, if only one X time slot exists, adjusting the X time slot in each uplink and downlink conversion period to be the time slot mainly based on the following behavior.
In an implementation, after the time slot adjustment, the method further includes:
other cells within the cell group are notified to make the same adjustment.
In an implementation, the method further comprises the following steps:
and determining whether to adjust the flexible frame structure of the cell group according to the capacity limit condition of each cell in the cell group.
In an implementation, the method further comprises the following steps:
before adjusting the frame structure of the cell group, when the flexible frame structures used by other cell groups are determined to be not matched according to the stored frame structure matching relationship, adjusting the flexible frame structure of the cell group; and/or the presence of a gas in the gas,
and after the cell group adjusts the frame structure, when the interference level between the cell group and other cell groups exceeds a preset threshold, returning the adjusted frame structure to the position before adjustment.
In the implementation, the flexible frame structure used by other cell groups is obtained through information interaction between the cell groups or obtained through OMC.
In an implementation, the method further comprises the following steps:
and acquiring the flexible frame structures used by other cell groups in a preset period, wherein only one cell group acquires the flexible frame structures used by other cell groups in one period.
In an implementation, the method further comprises the following steps:
when monitoring the interference level between the cell group and other cell groups, if the interference level exceeds a preset threshold, negotiating the used flexible frame structure with other cell groups with interference.
In an implementation, the method further comprises the following steps:
and determining whether to adjust the flexible frame structure of the cell group according to the capacity limitation condition of the cell group level.
A frame structure configuration apparatus, comprising:
the dividing module is used for dividing the cell groups;
and the configuration module is used for configuring the base stations of the same cell group to use the flexible frame structures with the same configuration.
A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for executing the above-described frame structure configuration method.
The invention has the following beneficial effects:
in the technical scheme provided by the embodiment of the invention, after the cell groups are divided, the base stations of the same cell group use the flexible frame structures with the same configuration, so the frame structures of all the cells in one cell group can be uniformly configured based on the flexible frame structures, thereby avoiding the cross time slot interference among the cells in the group.
Furthermore, the scheme can be easily applied to a 5G hot spot scene or a scene in which a 5G hot spot and a vertical industry coexist. Compared with a hotspot network, the capacity requirement of the vertical industry is not high, so a fixed frame structure, such as a typical 3U1D frame structure of 4.9GHz, can be configured in the cell group, and the cell group does not need to carry out capacity monitoring and adjust the frame structure. And each frame structure adjustment of the 5G hot spot cell group is carried out based on the result of network level regulation and control.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a diagram illustrating cross-slot interference in the prior art;
FIG. 2 is a flow chart illustrating an implementation of a frame structure configuration method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating an implementation of a cell group level control flow based on a flexible frame structure according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a cell group level regulation improvement process based on a flexible frame structure in an embodiment of the present invention;
FIG. 5 is a schematic diagram of a two-level regulation implementation flow based on a flexible frame structure according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a frame configuration apparatus according to an embodiment of the present invention.
Detailed Description
The inventor notices in the process of invention that:
in the 5G mobile communication system, there are two kinds of networking scenarios: the method has the advantages that firstly, in a hot scene, the resource utilization rate of idle cells is very low, busy cells are very large in accordance with requirements, and the capacity requirement is very high, and such scenes usually appear in large transportation hubs such as railway stations, bus stations and airports, and large venues and the like; and secondly, vertical industries, such as smart security, intelligent robots, and the like, application scenarios of such industries may have different traffic distributions from those of a traditional Enhanced Mobile Broadband (eMBB) service, and thus use different frame structures.
The scene comprises one or more of the following characteristics:
1) the user flow has the phenomenon of tidal flow, namely in a certain time period, the user capacity is extremely high, and in other time periods, the number of users is less;
2) isolation of some indoor scenes from other networks is good;
3) some cells have similar services;
4) there is cross-slot interference.
For a 5G hot spot scene or a scene in which a 5G hot spot and a vertical industry coexist, if more small base stations are deployed, although the capacity problem in busy hours is solved, the scheme is not a feasible scheme from the aspect of saving cost; if a small number of small base stations are deployed, the capacity requirement in busy hours can not be met obviously; the current mainstream scheme is to adopt the configuration of dynamic TDD, but this scheme introduces cross-slot interference, and the system complexity and performance loss introduced to avoid the cross-slot interference are also troublesome problems.
For 5G vertical industry application, when the system coexists with a hot spot scene, cross time slot interference still cannot be avoided.
In order to avoid cross slot interference, the mainstream schemes discussed by various manufacturers at present include three types: interference suppression based schemes, interference coordination based schemes, and perception based schemes.
An advanced receiver scheme based on interference suppression needs to introduce uplink and downlink symmetric DMRSs (demodulation reference signals) into a protocol, needs to exchange information between TRPs (Transmission and Reception nodes), such as information related to the DMRSs, including patterns, sequence initial IDs (identifiers), and some new signaling, such as signaling for sending necessary information to a UE (User Equipment), the necessary information includes DMRS port and sequence, so that the UE can use an E-LMMSE-IRC (Enhanced-Linear Minimum Mean Square Error based Interference Rejection Combining) receiver to suppress CLI (Cross Link Interference), for example, to acquire time aligned signaling, which includes parameters such as time offset and time adjustment.
Interference coordination based schemes require the study of reference signals for long-term CLI measurements, requiring dynamic information interaction between TRPs.
Interference-aware based schemes require short-term CLI measurements, require protocols to introduce perceptual signals for interference measurement or interference source identification, and may additionally require introduction of perceptual channels, perceptual resources, energy detection thresholds, perceptual parameters, and the like.
It can be seen that the above schemes are all based on protocol modification, and the implementation scheme is slightly complex. Therefore, if a scheme is provided to avoid or reduce the cross-slot interference, the network performance is certainly improved.
For the existing networking scheme of dynamic TDD, although flexible uplink and downlink configuration can meet the capacity requirement, the problem of cross timeslot interference caused by the flexible uplink and downlink configuration is not negligible. In addition, an interference back-off scheme introduced to solve the problem of cross slot interference generally needs to sacrifice system performance, and the scheme implementation is complex, even needs to change a protocol, for example, a new Reference Signal format needs to be designed, and a large amount of Information interaction (including configuration Information, scheduling Information, CSI-RS (CSI Reference Signal; CSI: Channel State Information) measurement, interference Information, and the like) between an interfering base station and a victim base station is needed.
Based on this, the embodiment of the present invention provides a configuration scheme of a flexible frame structure, so as to implement 5G hotspot networking and hotspot and vertical industry coexistence networking. In the scheme, a configuration based on a flexible frame structure is provided, so that cross slot interference can be avoided or reduced. In the scheme, a mechanism for performing two-stage regulation based on a flexible frame structure is also used, and the two mechanisms are network-level regulation and cell group-level regulation respectively. The following describes embodiments of the present invention with reference to the drawings.
Fig. 2 is a schematic flow chart of an implementation of a frame structure configuration method, as shown in the figure, the method may include:
Further, the method can also comprise the following steps:
and step 204, regulating and controlling a frame structure at the network level.
The implementation of steps 203, 204 will be described in detail below where appropriate.
The above scheme can be implemented at least by OMC.
In the scheme, the flexible frame structure means that all or part of time slots in a radio frame (10ms) are flexible, and the flexible time slots can be used for uplink or downlink or are not used in a vacant mode. The flexibility may be embodied at the slot level, and/or the symbol level.
In the implementation, the cells divided into the same cell group are the cells with the uplink and downlink service proportion in a preset interval in a statistical period.
In the implementation, after the cell groups are divided, the flexible frame structure adjustment of each cell group is triggered by an event, or is triggered by an event in a long period.
Specifically, for convenience of description, in the embodiment, the flexible frame structure adjustment of each cell group is referred to as network level regulation, and the network level regulation refers to regulation of a frame structure of each cell group in a relatively independent network, and the regulation may be based on an overall throughput Rate, an interference level, a Block Error Rate (BLER) and the like of the cell group. Considering the principle of cell grouping, as an embodiment, the cells may be grouped according to uplink and downlink services, for example, in a statistical period, the uplink and downlink service proportion of each cell is analyzed, and cells with close proportions are grouped into the same group. The network level regulation may be event triggered, or a mechanism combining long periods with event triggers may be used. In an implementation, a long period refers to a period that is an integer multiple of a cell group level adjustment period.
Network level regulation is event triggered, or event triggered over a long period. In the scheme of the embodiment, all cells are divided into cell groups, and then network level regulation is regulation of all cell groups. Partitioning a group of cells is not event-triggered, but is pre-planned based on the cells partitioned into the same group of cells.
The cell group level regulation refers to the regulation of the frame structure of each cell in one cell group. Under the cell grouping principle, the service conditions in the cell groups are similar, and unified configuration can be performed based on a flexible frame structure, so that cross time slot interference among the cells in the group is avoided. Cell group level regulation is a relatively fast process and can employ short-cycle combination event-triggered mechanisms.
After the cells are grouped according to the uplink and downlink service proportion, if the isolation between the cell groups is good, for example, when the cell groups use objects with fast wireless signal attenuation such as walls, ceilings and the like as boundaries, the inter-group interference does not need to be considered, so that the cell group level regulation is only needed. In a cell group, the frame structure configuration can be uniformly adjusted based on the uplink and downlink traffic, that is, in implementation, whether to adjust the flexible frame structure of the cell group can be determined according to the capacity limitation condition of each cell in the cell group, that is, whether to adjust the flexible frame structure of the cell group can be determined according to the capacity limitation condition of each cell in the cell group.
In the implementation, one or a combination of the following modes can be further included:
monitoring the service flow of each cell, and if the uplink capacity of a certain cell is not limited and the current configuration is not the initial configuration, returning the frame structure of all the cells to X by a time slot;
monitoring the service flow of each cell, and if monitoring that the capacity of a certain cell is limited, when no X time slot exists, no flow monitoring and/or no frame structure adjustment is carried out in the current adjustment period;
monitoring the service flow of each cell, if monitoring that the uplink capacity of a certain cell is limited, adjusting the last X time slot in each uplink and downlink conversion period to be a U time slot when more than one X time slot exists;
monitoring the service flow of each cell, if monitoring that the uplink capacity of a certain cell is limited, adjusting the X time slot in each uplink and downlink conversion period to be the time slot of the action master when only one X time slot exists;
monitoring the service flow of each cell, and if monitoring that the downlink capacity of a certain cell is limited, when no X time slot exists, no flow monitoring and/or no frame structure adjustment is performed in the current adjustment period;
monitoring the service flow of each cell, and if the limitation of the downlink capacity of a certain cell is monitored, adjusting the last X time slot in each uplink and downlink conversion period to be a D time slot when more than one X time slot exists;
monitoring the service flow of each cell, if monitoring that the downlink capacity of a certain cell is limited, if only one X time slot exists, adjusting the X time slot in each uplink and downlink conversion period to be the time slot mainly based on the following behavior.
In the implementation, X refers to Flexible, and the X slot is a Flexible slot, that is, may be an uplink or downlink slot.
In an implementation, after the time slot adjustment, the method further includes:
other cells within the cell group are notified to make the same adjustment.
Fig. 3 is a schematic diagram of a cell group level control flow based on a flexible frame structure, as shown in the figure, the following may be implemented:
1. dividing cell groups according to a cell grouping principle, and assuming that the isolation between the cell groups is good without considering inter-group interference;
2. in the cell group, each cell is configured to be a uniform flexible frame structure.
For example, a flexible frame structure may be configured for a cell at least according to 3GPP protocol 38.213, and SlotFormatCombination may be indicated by payload of DCI format 2_0(DCI format 2_ 0). As an embodiment, assuming that the uplink/downlink conversion period is 2.5ms and there is more uplink traffic, the initial slot format combination may be SlotFormatCombination {0,3,3,1,1}, i.e. the frame format in a 2.5ms period is dxxu.
3. Monitoring the service flow of each cell, and if it is monitored that the uplink capacity of a certain cell is limited, for example, the resource utilization rate of an uplink PRB (physical resource block) exceeds a certain threshold (for example, 90%), executing step 4; if the downlink capacity is limited, executing step 5; if the capacity is not limited, step 6 is executed.
4. Determine if there is an X slot? If not, executing the step 7;
if yes, continue to judge whether the number of X timeslots in 1 uplink/downlink switching period is more than 1? If yes, adjusting the last X time slot in each uplink and downlink conversion period into a U time slot, and informing other cells in the group to make the same adjustment so as to avoid cross time slot interference;
if not, adjusting the X time Slot in each uplink and downlink conversion period to the time Slot of the above action owner, such as Slot format 13, and informing other cells in the group to make the same adjustment.
5. Determine if there is an X slot? If not, executing the step 7;
if yes, continue to judge whether the number of X timeslots in 1 uplink/downlink switching period is more than 1? If yes, adjusting the first X time slot in each uplink and downlink conversion period to be a D time slot, and informing other cells in the group to make the same adjustment so as to avoid cross time slot interference;
if not, adjusting the X time Slot in each uplink and downlink conversion period to be the time Slot of the following line, such as Slot format 6, and informing other cells in the group to make the same adjustment.
6. And if the cell group has no capacity limitation condition and the current configuration is not the initial configuration, the frame structures of all the cells are backed to X by one time slot, namely, one time slot which is adjusted to be U or D is backed to X time slot.
7. In an adjustment period (such as 200ms), the flow monitoring is not carried out any more, and the frame structure adjustment is not accepted any more;
8. in the next adjustment period, steps 3-7 are repeated.
There are two possibilities for the above scheme: firstly, the service of each cell changes dynamically, and frequent configuration adjustment may be triggered; secondly, although the traffic between cells in a cell group is similar based on statistical analysis, if the traffic of an individual cell changes significantly in a certain time period and the cell triggers frame structure adjustment, the configuration of the whole cell group will be adjusted, which is obviously not an expected result.
Based on this, the implementation may further include:
and determining whether to adjust the flexible frame structure of the cell group according to the capacity limitation condition of the cell group level.
Specifically, the unified adjustment is performed based on the capacity limitation condition in one cell group, for example, the unified adjustment is performed based on the average PRB resource utilization rate in the cell group. For example, if 2 cells in a cell group are assumed, if the utilization rate of the downlink PRB of the first cell reaches 99.9%, it is considered that the downlink capacity of the cell is limited, and the frame structure needs to be adjusted; the utilization rate of the downlink PRB of the second cell is only 0.1 percent, the problem of limited downlink capacity does not exist, and the frame structure does not need to be adjusted; after the statistics and the average in the cell group, the downlink PRB utilization rate is 50%, and a threshold value for determination is set, for example, 50%, then, if the threshold value of the downlink PRB utilization rate is higher than 50%, it is considered that the cell group capacity is not limited, and no adjustment is needed. The scheme makes a judgment based on the cell group, and can reduce the adjustment times.
Therefore, the unified adjustment can be performed based on the statistical average of the cell groups, and fig. 4 is a schematic diagram of a cell group level regulation improvement flow based on a flexible frame structure, as shown in the figure, the following steps can be performed:
the specific steps can be described with reference to the implementation of fig. 3. Through the improved scheme, notification messages do not need to be sent among all cells in the group, the frequency of configuration adjustment is reduced, and the ping-pong effect is avoided.
In the implementation, the method can further comprise the following steps:
before adjusting the frame structure of the cell group, when the flexible frame structures used by other cell groups are determined to be not matched according to the stored frame structure matching relationship, adjusting the flexible frame structure of the cell group; and/or the presence of a gas in the gas,
and after the cell group adjusts the frame structure, when the interference level between the cell group and other cell groups exceeds a preset threshold, returning the adjusted frame structure to the position before adjustment.
Specifically, the above embodiments are based on the fact that there is no interference between groups, and in fact, the frame structures adopted between cell groups are different, which may cause cross slot interference, and the performance loss caused by the interference should be considered when adjusting the cell frame structure. Therefore, in the following embodiments, a two-stage regulation mechanism is introduced, and network-level regulation is considered on the basis of cell group-level regulation.
Network level regulation needs to regulate the frame structure of each cell group based on the overall performance of the network, such as interference level, BLER, uplink and downlink throughput, etc. As an embodiment, assume that a network is divided into 2 cell groups, the uplink and downlink switching period is 2.5ms, the first cell group is mainly based on uplink service, the initial frame structure is configured as DXXUU, the second cell group is mainly based on downlink service, the initial frame structure is DDXXU, and the interference condition is used as an index for measuring the network performance. There are two schemes to achieve network level regulation.
Firstly, a scheme based on pre-judgment.
Before adjusting the frame structure of the cell group, when the flexible frame structures used by other cell groups are determined to be not matched according to the stored frame structure matching relationship, adjusting the flexible frame structure of the cell group;
in the implementation, the flexible frame structure used by other cell groups is obtained through information interaction between the cell groups or obtained through OMC.
In the specific implementation, the method further comprises the following steps:
and acquiring the flexible frame structures used by other cell groups in a preset period, wherein only one cell group acquires the flexible frame structures used by other cell groups in one period.
Specifically, each time before the frame structure is adjusted, the cell may pre-determine which frame structures the adjusted frame structure may not match based on table 2 (where the frame structure does not match is indicated by bold italics); then, acquiring the frame structure of other cell groups through information interaction between the cell groups or OMC (Operation & Management Center); if the frame structures of other cell groups belong to the range of the unmatched frame structures, no adjustment is made in the period, otherwise, adjustment is made. In order to prevent two cell groups from adjusting the frame structure at the same time, it can be specified that only one cell group can inquire the frame structure of other cell groups in one period.
For example only, table 2 is shown, each table is unique under certain conditions, such as dividing 2 cell groups within the network, and in the case of an initial frame structure and a matching threshold determination, the table lists all possible combinations of frame structures, which are unique.
Table 2 example frame structure combinations within a network
In the table,/means nothing is involved, i.e. no interference is present.
The present embodiment can further reduce the frequency of frame structure adjustment and further reduce interclass cross slot interference.
And secondly, a scheme based on dynamic interference monitoring.
And after the cell group adjusts the frame structure, when the interference level between the cell group and other cell groups exceeds a preset threshold, returning the adjusted frame structure to the position before adjustment.
In the implementation, the method can further comprise the following steps:
when monitoring the interference level between the cell group and other cell groups, if the interference level exceeds a preset threshold, negotiating the used flexible frame structure with other cell groups with interference.
Specifically, after the cell group adjusts the frame structure, the interference level between the cell group and other cell groups is monitored. If the interference between the groups is too large, the adjustment is not matched with the configuration of other cell groups, and the adjusted frame structure is returned to the position before the adjustment. If the frame structure of other cell groups is adjusted during interference monitoring, interference monitoring is carried out again based on the latest configuration, and if the interference is found to be too large, negotiation solution can be carried out with the cell groups with the interference. The scheme of the embodiment does not need the OMC to maintain a database like Table 2 in the implementation although the frame structure adjustment frequency is increased.
Fig. 5 is a schematic diagram of a two-stage regulation implementation process based on a flexible frame structure, as shown in the figure, taking a network-level regulation scheme 1 as an example, the two-stage regulation mechanism may be as follows:
the first is cell group level regulation, i.e. the upper half of the partition line is the horizontal line in fig. 5.
1. And dividing the cell groups according to a cell grouping principle.
2. In the cell group, each cell is configured to be a uniform flexible frame structure.
3. The cell capacity is monitored and statistically averaged within the cell group.
4. If the limitation of the uplink capacity of a certain cell group is monitored, for example, the utilization rate of uplink PRB resources exceeds a certain threshold (for example, 90%), executing step 5; if the downlink capacity is limited, executing step 6; if the capacity is not limited, step 3 is performed if the current configuration is the initial configuration, and step 10 is performed if the current configuration is not the initial configuration.
5. Determine if there is an X slot? If not, executing the step 3; if yes, go to step 7.
6. Determine if there is an X slot? If not, executing the step 3; if yes, go to step 7.
The network level regulation process follows, i.e. the horizontal line is used as the lower half of the dividing line in fig. 5.
7. Before adjusting the frame structure, the cell group performs pre-judgment based on the stored database table to obtain a unmatched frame structure list.
8. And the cell group performs information interaction with other cell groups through the OMC or the OMC to obtain the frame structure configuration of the other cell groups in the network.
9. The cell group judges whether the frame structures of other cell groups are contained in the unmatched frame structure list, if so, the step 3 is executed; otherwise, considering the adjustment to be feasible, and then executing the step 10;
10. the cell group performs frame structure adjustment:
A. if the uplink capacity is limited, continue to determine whether the number of X slots in 1 uplink/downlink switching period is more than 1? If yes, the last X time Slot in each uplink and downlink conversion period is adjusted to be a U time Slot, and if not, the X time Slot in each uplink and downlink conversion period is adjusted to be a time Slot with the main behavior, such as Slot format 13.
B. If the downlink capacity is limited, continue to determine whether the number of X slots in 1 uplink/downlink switching period is more than 1? If yes, adjusting the first X time Slot in each uplink and downlink conversion period to be a D time Slot, and if not, adjusting the X time Slot in each uplink and downlink conversion period to be a time Slot with the following line as a main line, such as Slot format 6.
C. If the cell group has no capacity limitation, the frame structure of all the cells backs to X by one time slot, namely, one time slot which is adjusted to be U or D is backed to X time slot.
11. And starting a timer after the frame structure is adjusted. After the next period, i.e. the timer, has timed out, steps 3-10 are repeated.
The network level regulation and control reduces the interference among the groups, and the overall performance of the network is improved. Next, the inter-group interference coordination may be implemented by using an existing cross-slot interference avoidance scheme, which is not described herein again.
Based on the same inventive concept, embodiments of the present invention further provide a frame structure configuration apparatus and a computer-readable storage medium, and because the principle of solving the problem of these devices is similar to the frame structure configuration method, the implementation of these devices may refer to the implementation of the method, and repeated details are not repeated.
When the technical scheme provided by the embodiment of the invention is implemented, the implementation can be carried out as follows.
Fig. 6 is a schematic structural diagram of a frame configuration apparatus, as shown, including:
the processor 600, which is used to read the program in the memory 620, executes the following processes:
dividing a cell group;
the base stations configuring the same cell group use the same configuration of flexible frame structure;
a transceiver 610 for receiving and transmitting data under the control of the processor 600.
In the implementation, the cells divided into the same cell group are the cells with the uplink and downlink service proportion in a preset interval in a statistical period.
In the implementation, after the cell groups are divided, the flexible frame structure adjustment of each cell group is triggered by an event, or is triggered by an event in a long period.
In the implementation, one or the combination of the following modes is further included:
monitoring the service flow of each cell, and if the capacity of a certain cell is not limited and the current configuration is not the initial configuration, returning a time slot to X by the frame structure of all the cells;
monitoring the service flow of each cell, and if monitoring that the uplink capacity of a certain cell is limited, when no X time slot exists, no flow monitoring and/or no frame structure adjustment is carried out in the current adjustment period;
monitoring the service flow of each cell, if monitoring that the uplink capacity of a certain cell is limited, adjusting the last X time slot in each uplink and downlink conversion period to be a U time slot when more than one X time slot exists;
monitoring the service flow of each cell, if monitoring that the uplink capacity of a certain cell is limited, adjusting the X time slot in each uplink and downlink conversion period to be the time slot of the action master when only one X time slot exists;
monitoring the service flow of each cell, and if monitoring that the downlink capacity of a certain cell is limited, when no X time slot exists, no flow monitoring and/or no frame structure adjustment is performed in the current adjustment period;
monitoring the service flow of each cell, and if the limitation of the downlink capacity of a certain cell is monitored, adjusting the last X time slot in each uplink and downlink conversion period to be a D time slot when more than one X time slot exists;
monitoring the service flow of each cell, if monitoring that the downlink capacity of a certain cell is limited, if only one X time slot exists, adjusting the X time slot in each uplink and downlink conversion period to be the time slot mainly based on the following behavior.
In an implementation, after the time slot adjustment, the method further includes:
other cells within the cell group are notified to make the same adjustment.
In an implementation, the method further comprises the following steps:
and determining whether to adjust the flexible frame structure of the cell group according to the capacity limit condition of each cell in the cell group.
In an implementation, the method further comprises the following steps:
before adjusting the frame structure of the cell group, when the flexible frame structures used by other cell groups are determined to be not matched according to the stored frame structure matching relationship, adjusting the flexible frame structure of the cell group; and/or the presence of a gas in the gas,
and after the cell group adjusts the frame structure, when the interference level between the cell group and other cell groups exceeds a preset threshold, returning the adjusted frame structure to the position before adjustment.
In the implementation, the flexible frame structure used by other cell groups is obtained through information interaction between the cell groups or obtained through OMC.
In an implementation, the method further comprises the following steps:
and acquiring the flexible frame structures used by other cell groups in a preset period, wherein only one cell group acquires the flexible frame structures used by other cell groups in one period.
In an implementation, the method further comprises the following steps:
when monitoring the interference level between the cell group and other cell groups, if the interference level exceeds a preset threshold, negotiating the used flexible frame structure with other cell groups with interference.
In an implementation, the method further comprises the following steps:
and determining whether to adjust the flexible frame structure of the cell group according to the capacity limitation condition of the cell group level.
Where in fig. 6, the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, particularly one or more processors represented by processor 600 and memory represented by memory 620. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 610 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. The processor 600 is responsible for managing the bus architecture and general processing, and the memory 620 may store data used by the processor 600 in performing operations.
The embodiment of the invention also provides a frame structure configuration device, which comprises:
the dividing module is used for dividing the cell groups;
and the configuration module is used for configuring the base stations of the same cell group to use the flexible frame structures with the same configuration.
The specific implementation can be seen in the implementation of the frame structure configuration method.
For convenience of description, each part of the above-described apparatus is separately described as being functionally divided into various modules or units. Of course, the functionality of the various modules or units may be implemented in the same one or more pieces of software or hardware in practicing the invention.
The embodiment of the present invention further provides a computer-readable storage medium, which is characterized in that the computer-readable storage medium stores a computer program for executing the frame structure configuration method.
The specific implementation can be seen in the implementation of the frame structure configuration method.
In summary, the technical solution provided in the embodiments of the present invention provides a two-stage regulation scheme based on a flexible frame structure, that is, network-level regulation and cell-group-level regulation.
According to the flow statistics of the cell group, uniform configuration and adjustment are carried out based on a flexible frame structure, and the inter-group cross time slot interference is avoided.
And the network level regulates and controls the interference judgment or monitoring among the cell groups, so that the interference coordination is carried out, and the overall performance of the network is improved.
And expanding the use mode of statistical analysis for dynamic adjustment of the frame structure.
The scheme can be easily applied to a 5G hot spot scene or a scene in which a 5G hot spot and a vertical industry coexist. Compared with a hotspot network, the capacity requirement of the vertical industry is not high, so a fixed frame structure, such as a typical 3U1D frame structure of 4.9GHz, can be configured in the cell group, and the cell group does not need to carry out capacity monitoring and adjust the frame structure. And each frame structure adjustment of the 5G hot spot cell group is carried out based on the result of network level regulation and control.
Further, to meet more flexible service requirements, different uplink and downlink conversion periods and different time slot format combinations can be configured for the cell, and even symbol level adjustment can be realized based on flexible symbols.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (22)
1. A method for configuring a frame structure, comprising:
dividing a cell group;
base stations configuring the same cell group use the same configured flexible frame structure.
2. The method of claim 1, wherein the cells divided into the same cell group are cells having an uplink/downlink traffic ratio within a predetermined interval within a statistical period.
3. The method of claim 1, wherein the flexible frame structure adjustment for each cell group is event triggered after the cell group is partitioned, or event triggered during a long period.
4. The method of any one of claims 1 to 3, further comprising one or a combination of the following:
monitoring the service flow of each cell, and if the capacity of a certain cell is not limited and the current configuration is not the initial configuration, returning one time slot to the flexible time slot X time slot by the frame structure of all the cells;
monitoring the service flow of each cell, and if monitoring that the uplink capacity of a certain cell is limited, when no X time slot exists, no flow monitoring and/or no frame structure adjustment is performed in the current adjustment period;
monitoring the service flow of each cell, if monitoring that the uplink capacity of a certain cell is limited, adjusting the last X time slot in each uplink and downlink conversion period to be a U time slot when more than one X time slot exists;
monitoring the service flow of each cell, if monitoring that the uplink capacity of a certain cell is limited, adjusting the X time slot in each uplink and downlink conversion period to be the time slot of the action master when only one X time slot exists;
monitoring the service flow of each cell, and if monitoring that the downlink capacity of a certain cell is limited, when no X time slot exists, no flow monitoring and/or no frame structure adjustment is performed in the current adjustment period;
monitoring the service flow of each cell, if monitoring that the downlink capacity of a certain cell is limited, adjusting the last X time slot in each uplink and downlink conversion period to be a D time slot when more than one X time slot exists;
and monitoring the service flow of each cell, and if the limitation of the downlink capacity of a certain cell is monitored, adjusting the X time slot in each uplink and downlink conversion period to be the time slot mainly based on the following line when only one X time slot exists.
5. The method of claim 4, after the time slot adjustment, further comprising:
other cells within the cell group are notified to make the same adjustment.
6. The method of claim 4, further comprising:
and determining whether to adjust the flexible frame structure of the cell group according to the capacity limit condition of each cell in the cell group.
7. The method of claim 4, further comprising:
before adjusting the frame structure of the cell group, when the flexible frame structures used by other cell groups are determined to be not matched according to the stored frame structure matching relationship, adjusting the flexible frame structure of the cell group; and/or the presence of a gas in the gas,
and after the cell group adjusts the frame structure, when the interference level between the cell group and other cell groups exceeds a preset threshold, returning the adjusted frame structure to the position before adjustment.
8. The method of claim 7, wherein the flexible frame structure used by the other cell groups is obtained through inter-cell information exchange or through an Operation Management Center (OMC).
9. The method of claim 8, further comprising:
and acquiring the flexible frame structures used by other cell groups in a preset period, wherein only one cell group acquires the flexible frame structures used by other cell groups in one period.
10. The method of claim 7, further comprising:
when monitoring the interference level between the cell group and other cell groups, if the interference level exceeds a preset threshold, negotiating the used flexible frame structure with other cell groups with interference.
11. A frame structure configuration apparatus, comprising:
a processor for reading the program in the memory, performing the following processes:
dividing a cell group;
the base stations configuring the same cell group use the same configuration of flexible frame structure;
a transceiver for receiving and transmitting data under the control of the processor.
12. The apparatus of claim 11, wherein the cells divided into the same cell group are cells having an uplink/downlink traffic ratio within a predetermined interval in a statistical period.
13. The apparatus of claim 11, wherein flexible frame structure adjustment for each cell group is event triggered after the cell group is partitioned or event triggered over a long period.
14. The apparatus of any of claims 11 to 13, further comprising one or a combination of:
monitoring the service flow of each cell, and if the capacity of a certain cell is not limited and the current configuration is not the initial configuration, returning a time slot to X by the frame structure of all the cells;
monitoring the service flow of each cell, and if monitoring that the uplink capacity of a certain cell is limited, when no X time slot exists, no flow monitoring and/or no frame structure adjustment is performed in the current adjustment period;
monitoring the service flow of each cell, if monitoring that the uplink capacity of a certain cell is limited, adjusting the last X time slot in each uplink and downlink conversion period to be a U time slot when more than one X time slot exists;
monitoring the service flow of each cell, if monitoring that the uplink capacity of a certain cell is limited, adjusting the X time slot in each uplink and downlink conversion period to be the time slot of the action master when only one X time slot exists;
monitoring the service flow of each cell, and if monitoring that the downlink capacity of a certain cell is limited, when no X time slot exists, no flow monitoring and/or no frame structure adjustment is performed in the current adjustment period;
monitoring the service flow of each cell, if monitoring that the downlink capacity of a certain cell is limited, adjusting the last X time slot in each uplink and downlink conversion period to be a D time slot when more than one X time slot exists;
and monitoring the service flow of each cell, and if the limitation of the downlink capacity of a certain cell is monitored, adjusting the X time slot in each uplink and downlink conversion period to be the time slot mainly based on the following line when only one X time slot exists.
15. The apparatus of claim 14, wherein after the time slot adjustment, further comprising:
other cells within the cell group are notified to make the same adjustment.
16. The method of claim 14, further comprising:
and determining whether to adjust the flexible frame structure of the cell group according to the capacity limit condition of each cell in the cell group.
17. The apparatus of claim 14, further comprising:
before adjusting the frame structure of the cell group, when the flexible frame structures used by other cell groups are determined to be not matched according to the stored frame structure matching relationship, adjusting the flexible frame structure of the cell group; and/or the presence of a gas in the gas,
and after the cell group adjusts the frame structure, when the interference level between the cell group and other cell groups exceeds a preset threshold, returning the adjusted frame structure to the position before adjustment.
18. The apparatus of claim 17, wherein the flexible frame structure used by the other cell groups is obtained through inter-cell information exchange or is obtained through OMC.
19. The apparatus of claim 18, further comprising:
and acquiring the flexible frame structures used by other cell groups in a preset period, wherein only one cell group acquires the flexible frame structures used by other cell groups in one period.
20. The apparatus of claim 17, further comprising:
when monitoring the interference level between the cell group and other cell groups, if the interference level exceeds a preset threshold, negotiating the used flexible frame structure with other cell groups with interference.
21. A frame structure configuration apparatus, comprising:
the dividing module is used for dividing the cell groups;
and the configuration module is used for configuring the base stations of the same cell group to use the flexible frame structures with the same configuration.
22. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for executing the method of any one of claims 1 to 10.
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