CN114258036B - Frame structure configuration method, device and storage medium - Google Patents
Frame structure configuration method, device and storage medium Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/10—Flow control between communication endpoints
Abstract
The invention discloses a frame structure configuration method, a device and a storage medium, comprising the following steps: dividing cell groups; base stations that configure the same cell group use the same configured flexible frame structure. By adopting the invention, cross time slot interference among cells in the group is avoided. Can be easily applied to 5G hot spot scenes or scenes in which 5G hot spots coexist with the vertical industry.
Description
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to a frame structure configuration method, a device, and a storage medium.
Background
For the 5G hotspot networking scheme, the current mainstream scheme is a configuration using dynamic TDD (time division duplex ). A TDD system of NR (New Radio) may be dynamically configured in units of slots or symbols through DCI (downlink control information ). Flexible time slots can be configured through time slot format combination; with DCI information, each symbol may be configured as an uplink (U), a downlink (D), or a flexible symbol (F) in each slot according to scheduling conditions, as shown in table 1.
Table 1: time slot format under conventional CP (Cyclic Prefix)
The frame structure of dynamic TDD has more flexibility and can better match service, so the system capacity is larger. However, dynamic TDD also introduces a new problem, i.e. cross-slot interference. Since each base station dynamically configures a frame structure according to respective service conditions, it is likely that transmission directions of two adjacent or similar base stations are inconsistent in a certain period of time, and then a base station transmitting downlink will cause serious cross slot interference to a base station transmitting uplink, and fig. 1 is a schematic diagram of cross slot interference, as shown in fig. 1.
It can be seen that, for the existing networking scheme of dynamic TDD, the flexible uplink and downlink configuration can meet the capacity requirement, but also brings the problem of cross slot interference.
The problems of the prior art are: the existing scheme for solving the cross time slot interference is based on the premise of protocol modification, and the implementation scheme is 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 cell groups;
base stations that configure the same cell group use the same configured flexible frame structure.
In implementation, the cells divided into the same cell group are cells with uplink and downlink service proportion in a preset interval in one statistical period.
In practice, after dividing the cell groups, the flexible frame structure adjustment for each cell group is event-triggered, or event-triggered for a long period.
In practice, one or a combination of the following modes are further included:
monitoring the service flow of each cell, if the capacity of a certain cell is not limited and the current configuration is not the initial configuration, the frame structures of all cells are retracted by one time slot to X;
monitoring the service flow of each cell, if the uplink capacity of a certain cell is limited, and when the X time slot does not exist, no flow monitoring and/or frame structure adjustment are performed in the current adjustment period;
monitoring the service flow of each cell, if the uplink capacity of a certain cell is limited, when more than one X time slot exists, adjusting the last X time slot in each uplink and downlink conversion period to be a U time slot;
monitoring the service flow of each cell, if the uplink capacity of a certain cell is limited, when only one X time slot exists, adjusting the X time slot in each uplink and downlink conversion period to be the time slot with the main action;
Monitoring the service flow of each cell, if the downlink capacity of a certain cell is limited, and when the X time slot does not exist, no flow monitoring and/or frame structure adjustment are performed in the current adjustment period;
monitoring the service flow of each cell, if the downlink capacity of a certain cell is limited, when more than one X time slot exists, adjusting the last X time slot in each uplink and downlink conversion period to be a D time slot;
and monitoring the service flow of each cell, and if the downlink capacity of a certain cell is limited, when only one X time slot exists, adjusting the X time slot in each uplink and downlink conversion period to be the time slot with the following main action.
In an implementation, after the time slot adjustment, the method further includes:
other cells within the cell group are notified to make the same adjustments.
In practice, further comprising:
and determining whether to carry out flexible frame structure adjustment on the cell group according to the capacity limited condition of each cell in the cell group.
In practice, further comprising:
before the cell group adjusts the frame structure, according to the stored frame structure matching relation, when the flexible frame structures used by other cell groups are determined to be unmatched, the flexible frame structure of the cell group is adjusted; and/or the number of the groups of groups,
When the interference level between the cell group and other cell groups exceeds a preset threshold after the cell group adjusts the frame structure, the adjusted frame structure is retracted to be before adjustment.
In practice, the flexible frame structure used by other cell groups is obtained through information interaction among the cell groups or obtained through OMC.
In practice, further comprising:
and acquiring the flexible frame structures used by other cell groups in a preset period, wherein only one cell group in one period is used for acquiring the flexible frame structures used by other cell groups.
In practice, further comprising:
when monitoring the interference level between the local cell group and other cell groups, negotiating the flexible frame structure used with the other cell groups with interference if the preset threshold is exceeded.
In practice, further comprising:
and determining whether to carry out flexible frame structure adjustment on 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 process:
dividing cell groups;
a base station configured with the same cell group uses a flexible frame structure with the same configuration;
and a transceiver for receiving and transmitting data under the control of the processor.
In implementation, the cells divided into the same cell group are cells with uplink and downlink service proportion in a preset interval in one statistical period.
In practice, after dividing the cell groups, the flexible frame structure adjustment for each cell group is event-triggered, or event-triggered for a long period.
In practice, one or a combination of the following modes are further included:
monitoring the service flow of each cell, if the capacity of a certain cell is not limited and the current configuration is not the initial configuration, the frame structures of all cells are retracted by one time slot to X;
monitoring the service flow of each cell, if the uplink capacity of a certain cell is limited, and when the X time slot does not exist, no flow monitoring and/or frame structure adjustment are performed in the current adjustment period;
monitoring the service flow of each cell, if the uplink capacity of a certain cell is limited, when more than one X time slot exists, adjusting the last X time slot in each uplink and downlink conversion period to be a U time slot;
monitoring the service flow of each cell, if the uplink capacity of a certain cell is limited, when only one X time slot exists, adjusting the X time slot in each uplink and downlink conversion period to be the time slot with the main action;
Monitoring the service flow of each cell, if the downlink capacity of a certain cell is limited, and when the X time slot does not exist, no flow monitoring and/or frame structure adjustment are performed in the current adjustment period;
monitoring the service flow of each cell, if the downlink capacity of a certain cell is limited, when more than one X time slot exists, adjusting the last X time slot in each uplink and downlink conversion period to be a D time slot;
and monitoring the service flow of each cell, and if the downlink capacity of a certain cell is limited, when only one X time slot exists, adjusting the X time slot in each uplink and downlink conversion period to be the time slot with the following main action.
In an implementation, after the time slot adjustment, the method further includes:
other cells within the cell group are notified to make the same adjustments.
In practice, further comprising:
and determining whether to carry out flexible frame structure adjustment on the cell group according to the capacity limited condition of each cell in the cell group.
In practice, further comprising:
before the cell group adjusts the frame structure, according to the stored frame structure matching relation, when the flexible frame structures used by other cell groups are determined to be unmatched, the flexible frame structure of the cell group is adjusted; and/or the number of the groups of groups,
When the interference level between the cell group and other cell groups exceeds a preset threshold after the cell group adjusts the frame structure, the adjusted frame structure is retracted to be before adjustment.
In practice, the flexible frame structure used by other cell groups is obtained through information interaction among the cell groups or obtained through OMC.
In practice, further comprising:
and acquiring the flexible frame structures used by other cell groups in a preset period, wherein only one cell group in one period is used for acquiring the flexible frame structures used by other cell groups.
In practice, further comprising:
when monitoring the interference level between the local cell group and other cell groups, negotiating the flexible frame structure used with the other cell groups with interference if the preset threshold is exceeded.
In practice, further comprising:
and determining whether to carry out flexible frame structure adjustment on the cell group according to the capacity limited condition of the cell group level.
A frame structure configuration apparatus comprising:
the dividing module is used for dividing the cell group;
and the configuration module is used for configuring the base stations of the same cell group to use the same configured flexible frame structure.
A computer-readable storage medium storing 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 same flexible frame structure, so that the frame structures of all cells in one cell group can be uniformly configured based on the flexible frame structure, and cross time slot interference among cells in the group is avoided.
Further, 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 hot spot network, the capacity requirement of the vertical industry is not high, so that 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 monitor the capacity and adjust the frame structure. Each frame structure adjustment of the 5G hot spot cell group is performed based on the result of the network level regulation.
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 do not constitute a limitation on the invention. In the drawings:
FIG. 1 is a schematic diagram of cross-slot interference in the background art;
FIG. 2 is a schematic diagram of a frame structure configuration method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a cell group level adjustment and 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 adjustment and control improvement flow based on a flexible frame structure in an embodiment of the present invention;
FIG. 5 is a schematic diagram of a two-stage regulation implementation flow based on a flexible frame structure in 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 inventors noted during the course of the invention that:
in a 5G mobile communication system, there are two kinds of networking scenarios: firstly, hot spot scenes, low utilization rate of idle cell resources, large busy cell coincidence and high capacity requirement, and the scenes usually appear in large transportation hubs such as railway stations, bus stops, airports and the like, large stadiums and the like; secondly, in vertical industries, such as intelligent security, intelligent robots, etc., the application scenario of such industries may have different traffic distribution from the traditional eMBB (enhanced mobile internet, enhanced Mobile Broadband) service, and thus use different frame structures.
The above scenario includes one or more of the following features:
1) The user flow has the phenomenon of tidal flow, namely, in a certain specific time period, the user capacity is extremely high, and in other time periods, the number of users is small;
2) The isolation of some indoor scenes and other networks is good;
3) Some cells have similar traffic;
4) There is cross slot interference.
Aiming at a 5G hot spot scene or a scene in which 5G hot spots coexist with the vertical industry, if more small base stations are deployed, although the capacity problem in busy hours is solved, the method 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 cannot be obviously met; the current mainstream scheme is to adopt dynamic TDD configuration, but this scheme introduces cross slot interference, and the system complexity and performance loss introduced to avoid cross slot interference are also puzzled problems.
For 5G vertical industry applications, cross slot interference still cannot be avoided when the system is coexistent with hot spot scenes.
To avoid cross slot interference, the main schemes currently discussed by various manufacturers include three types: interference suppression based schemes, interference coordination based schemes, and perceptually based schemes.
Advanced receiver schemes based on interference suppression require that DMRS (demodulation reference signal ) with up-down symmetry be introduced in the protocol, that information interaction between TRP (transmission and reception nodes, transmission and Reception Point) be required, such as information related to DMRS including mode, sequence initial ID (identity), etc., and that new signaling be required, such as signaling for transmitting necessary information to UE (User Equipment), including DMRS ports, sequence, so that UE can employ E-LMMSE-IRC (Enhanced linear interference suppression combining based on minimum mean square error, enhanced-Linear Minimum Mean Square Error-Interference Rejection Combining) receiver to suppress CLI (cross link interference ), and that time aligned signaling be acquired, where the signaling needs to include parameters such as time offset, time adjustment, etc.
Based on the scheme of interference coordination, reference signals for long-term CLI measurement need to be studied, and information interaction between TRP needs to be dynamic.
Based on the scheme of interference sensing, short-term CLI measurement is needed, a protocol is needed to introduce sensing signals for interference measurement or interference source identification, and sensing channels, sensing resources, energy detection thresholds, sensing parameters and the like may be needed to be introduced.
It can be seen that the above schemes are all premised on protocol modification, and the implementation scheme is slightly complex. Therefore, if a scheme can avoid or reduce cross time slot interference, the network performance is definitely improved.
For the existing networking scheme of dynamic TDD, the flexible uplink and downlink configuration can meet the capacity requirement, but the problem of cross time slot interference is not ignored. In addition, in order to solve the problem of cross slot interference, the interference back-off scheme is usually required to sacrifice system performance, and the scheme is complex to implement, and even needs to change the protocol, such as designing a new reference signal format, and a large amount of information interaction (including configuration information, scheduling information, CSI-RS (CSI reference signal, CSI Reference Signal; CSI: channel state information, channel State Information) measurement, interference information, etc.) between the scrambling base station and the scrambling base station is required.
Based on the above, the embodiment of the invention provides a configuration scheme of a flexible frame structure so as to realize 5G hot spot networking and hot spot and vertical industry coexistence networking. The proposal provides a configuration based on a flexible frame structure, which can avoid or reduce cross time slot interference. The scheme also uses a mechanism for two-stage regulation based on a flexible frame structure, namely network-level regulation and cell group-level regulation. The following describes specific 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, which may include:
step 201, dividing cell groups;
step 202, the base stations configured with the same cell group use the same configured flexible frame structure.
Further, the method may further include:
step 203, cell group level regulation frame structure;
step 204, network level regulation frame structure.
The specific implementation of steps 203, 204 will be described in the corresponding places.
The above scheme may be implemented at least by OMC.
In this scheme, the flexible frame structure means that all or part of the slots in a radio frame (10 ms) are flexible, and flexible slots can be used for uplink or downlink or idle. Flexibility may be embodied at the slot level, and/or at the symbol level.
In implementation, the cells divided into the same cell group are cells with uplink and downlink service proportion in a preset interval in one statistical period.
In practice, after dividing the cell groups, the flexible frame structure adjustment for each cell group is event-triggered, or event-triggered for 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 adjustment, where network level adjustment refers to adjusting the frame structure of each cell group in a relatively independent network, where the adjustment may be based on the overall throughput Rate, interference level, BLER (Block Error Rate), and the like of the cell group. Considering the principle of grouping cells, as an embodiment, 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 proportion are divided into the same group. The network level regulation can be event triggering, and a mechanism combining long period with event triggering can also be adopted. In practice, a long period refers to a period that is an integer multiple of the cell group level adjustment period.
Network level regulation is event-triggered or, for a long period, event-triggered. In the embodiment, the cell groups are firstly divided into all cells, and then the network level regulation is the regulation of all the cell groups. The division of cell groups is not event triggered and is based on a pre-programmed cell division into the same cell group.
Cell group level regulation refers to regulating the frame structure of each cell within one cell group. Under the cell grouping principle, the service conditions in the cell group are similar, and unified configuration can be performed based on a flexible frame structure, so that cross time slot interference among cells in the group is avoided. Cell group level regulation is a relatively fast process and may employ a mechanism that incorporates short cycle time with event triggering.
After the cell groups 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 take objects with fast wireless signal attenuation such as walls, ceilings and the like as dividing lines, the inter-group interference does not need to be considered, so that only cell group level regulation and control are needed. In a cell group, the unified adjustment of the frame structure configuration can be performed based on the uplink and downlink traffic, that is, in the implementation, whether the flexible frame structure adjustment is performed on the cell group can be determined according to the capacity limited condition of each cell in the cell group, that is, whether the flexible frame structure adjustment is performed on the cell group is determined according to the capacity limited condition of each cell in the cell group.
In practice, it may further comprise one or a combination of the following modes:
Monitoring the service flow of each cell, if the uplink capacity of a certain cell is not limited and the current configuration is not the initial configuration, the frame structures of all cells are retracted by one time slot to X;
monitoring the service flow of each cell, if the capacity of a certain cell is limited, and when the X time slot does not exist, no flow monitoring and/or frame structure adjustment are performed in the current adjustment period;
monitoring the service flow of each cell, if the uplink capacity of a certain cell is limited, when more than one X time slot exists, adjusting the last X time slot in each uplink and downlink conversion period to be a U time slot;
monitoring the service flow of each cell, if the uplink capacity of a certain cell is limited, when only one X time slot exists, adjusting the X time slot in each uplink and downlink conversion period to be the time slot with the main action;
monitoring the service flow of each cell, if the downlink capacity of a certain cell is limited, and when the X time slot does not exist, no flow monitoring and/or frame structure adjustment are performed in the current adjustment period;
monitoring the service flow of each cell, if the downlink capacity of a certain cell is limited, when more than one X time slot exists, adjusting the last X time slot in each uplink and downlink conversion period to be a D time slot;
And monitoring the service flow of each cell, and if the downlink capacity of a certain cell is limited, when only one X time slot exists, adjusting the X time slot in each uplink and downlink conversion period to be the time slot with the following main action.
In implementation, X refers to Flexible, and X slots are Flexible slots, that is, uplink or downlink slots.
In an implementation, after the time slot adjustment, the method further includes:
other cells within the cell group are notified to make the same adjustments.
Fig. 3 is a schematic diagram of a cell group level regulation flow implementation based on a flexible frame structure, and as shown in the figure, can be as follows:
1. dividing cell groups according to a cell grouping principle, and assuming that the isolation between the cell groups is good, and no inter-group interference is needed to be considered;
2. within a cell group, each cell is configured as a unified flexible frame structure.
For example, a flexible frame structure may be configured for a cell according to at least 3GPP protocol 38.213, and slotformat may be indicated by payload of DCI format 2_0 (DCI format 2_0). As an embodiment, assuming that the up-down conversion period is 2.5ms and the uplink service is more, the initial slot format combination may be slotformatcombination= {0,3,3,1,1}, i.e. the frame format in one 2.5ms period is DXXUU.
3. Monitoring the service flow of each cell, if it is monitored that the uplink capacity of a certain cell is limited, for example, if the resource utilization rate of uplink PRB (physical resource block ) exceeds a certain threshold (for example, 90%), executing step 4; if the downlink capacity is limited, executing the step 5; if the capacity is not limited, step 6 is performed.
4. Determine if there is an X slot? If not, executing the step 7;
if yes, continue to determine if the number of X slots in 1 up-down conversion 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 other cells in the group are notified to make the same adjustment so as to avoid cross time slot interference;
if not, the X time Slot in each uplink/downlink conversion period is adjusted to the time Slot with the main action, such as Slot format 13, and other cells in the group are notified to make the same adjustment.
5. Determine if there is an X slot? If not, executing the step 7;
if yes, continue to determine if the number of X slots in 1 up-down conversion period is more than 1? If yes, the first X time slot in each uplink and downlink conversion period is adjusted to be a D time slot, and other cells in the group are notified to make the same adjustment so as to avoid cross time slot interference;
If not, the X time Slot in each uplink and downlink conversion period is adjusted to be the time Slot with the following action, such as Slot format 6, and other cells in the group are notified to make the same adjustment.
6. If there is no capacity limitation in the cell group and the current configuration is not the initial configuration, the frame structure of all cells is rolled back to X by one slot, i.e. one slot previously adjusted to U or D is rolled back to X slot.
7. No longer traffic monitoring is performed within one adjustment period (e.g., 200 ms), and no frame structure adjustment is accepted;
8. and repeating the steps 3-7 in the next adjustment period.
There are two possibilities for the above scheme: firstly, the dynamic change of the business of each cell may trigger frequent configuration adjustment; secondly, although the traffic between cells within a cell group is similar based on statistical analysis, if the traffic of an individual cell changes significantly during a certain period of time and this cell triggers frame structure adjustment, the configuration of the entire cell group will be adjusted, which is obviously not a desired result.
Based on this, the implementation may further include:
and determining whether to carry out flexible frame structure adjustment on the cell group according to the capacity limited condition of the cell group level.
Specifically, the unified adjustment is performed based on the capacity limited situation in one cell group, such as the adjustment is performed based on the average PRB resource utilization in the cell group. For example, assuming 2 cells in a cell group, if the downlink PRB utilization of the first cell reaches 99.9%, the downlink capacity of the cell is considered to be limited, and the frame structure needs to be adjusted; the utilization rate of the downlink PRB of the second cell is only 0.1%, the problem of limited downlink capacity is avoided, and the frame structure is not required to be adjusted; after statistical averaging within a cell group, the downlink PRB utilization=50%, and a judgment threshold is set, for example, 50%, and if the threshold of the downlink PRB utilization is higher than 50%, the cell group capacity is considered to be unlimited, and no adjustment is needed. The scheme makes judgment based on the cell group, so that the adjustment times can be reduced.
Thus, the unified adjustment can be performed based on the statistical average of the cell groups, fig. 4 is a schematic diagram of a cell group level regulation improvement flow based on a flexible frame structure, and as shown in the figure, the following can be adopted:
the specific steps may be described with reference to the implementation of fig. 3. Through the improved scheme, notification messages are not required to be sent among all cells in the group, the frequency of configuration adjustment is reduced, and the ping-pong effect is avoided.
In practice, the method may further comprise:
before the cell group adjusts the frame structure, according to the stored frame structure matching relation, when the flexible frame structures used by other cell groups are determined to be unmatched, the flexible frame structure of the cell group is adjusted; and/or the number of the groups of groups,
when the interference level between the cell group and other cell groups exceeds a preset threshold after the cell group adjusts the frame structure, the adjusted frame structure is retracted to be before adjustment.
Specifically, the above embodiments are based on no interference between groups, and in fact, the frame structures adopted between cell groups are different, which may cause cross slot interference, and performance loss caused by interference should be considered when adjusting the cell frame structure. Thus, two levels of regulation mechanisms are introduced in the following examples, taking network level regulation into account on the basis of cell group level regulation.
Network level regulation requires regulation of 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, it is assumed that a network is divided into 2 cell groups, the uplink-downlink conversion period is 2.5ms, the first cell group is mainly uplink traffic, the initial frame structure is configured as DXXUU, the second cell group is mainly downlink traffic, the initial frame structure is DDXXU, and the interference condition is used as an index for measuring the network performance. There are two schemes that can achieve network level regulation.
1. Based on a pre-determined scheme.
Before the cell group adjusts the frame structure, according to the stored frame structure matching relation, when the flexible frame structures used by other cell groups are determined to be unmatched, the flexible frame structure of the cell group is adjusted;
in practice, the flexible frame structure used by other cell groups is obtained through information interaction among the cell groups or obtained through OMC.
In a specific implementation, the method further comprises:
and acquiring the flexible frame structures used by other cell groups in a preset period, wherein only one cell group in one period is used for acquiring the flexible frame structures used by other cell groups.
Specifically, before each frame structure adjustment, the cell may pre-determine, based on table 2, which frame structures the adjusted frame structure may not match (where the mismatch is indicated by bold italics); then obtaining the frame structure of other cell groups through the information interaction among the cell groups or OMC (Operation management center & Management Center); if the frame structures of other cell groups belong to the range of the unmatched frame structures, the adjustment is not carried out in the period, otherwise, the adjustment is carried out. To prevent two cell groups from making frame structure adjustments at the same time, it may be provided that only one cell group can query the frame structure of the other cell groups within one period.
For example only, each table is unique under certain conditions, such as dividing 2 cell groups within the network, and in the case of initial frame structure and match threshold determination, this table lists all possible frame structure combinations as unique.
Table 2 frame structure combination examples within a network
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In the table,/indicates no involvement, i.e. no interference.
The embodiment can further reduce the frequency of frame structure adjustment and further reduce inter-group cross time slot interference.
2. A dynamic interference monitoring based scheme.
When the interference level between the cell group and other cell groups exceeds a preset threshold after the cell group adjusts the frame structure, the adjusted frame structure is retracted to be before adjustment.
In practice, the method may further comprise:
when monitoring the interference level between the local cell group and other cell groups, negotiating the flexible frame structure used with the other cell groups with interference if the preset threshold is exceeded.
Specifically, after the cell group adjusts the frame structure, the interference level between the cell group and other cell groups is monitored. If the inter-group interference is too large, the adjustment is not matched with the configuration of other cell groups, and the adjusted frame structure is retracted to be before adjustment. If the frame structure is adjusted by other cell groups during the interference monitoring, the interference monitoring is carried out again based on the latest configuration, and if the interference is found to be too large, the negotiation solution can be carried out with the cell group with the interference. Although the frame structure adjustment frequency is increased in the scheme of this embodiment, the OMC is not required to maintain a database similar to table 2 in the implementation.
Fig. 5 is a schematic diagram of a two-stage regulation implementation flow based on a flexible frame structure, and as shown in the figure, taking network-level regulation scheme 1 as an example, the two-stage regulation mechanism can be as follows:
first is cell group level regulation, i.e. the upper half of the split line with the horizontal line in fig. 5.
1. The cell groups are partitioned according to the cell grouping principle.
2. Within a cell group, each cell is configured as a unified flexible frame structure.
3. The cell capacity is monitored and statistical averages are made over the cell group.
4. If it is detected that the uplink capacity of a certain cell group is limited, for example, the uplink PRB resource utilization exceeds a certain threshold (for example, 90%), executing step 5; if the downlink capacity is limited, executing the 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, namely, the lower half of the parting line is a horizontal line in fig. 5.
7. Before adjusting the frame structure, the cell group is pre-judged based on the stored database table to obtain a non-matched frame structure list.
8. And the cell group performs information interaction with other cell groups through the OMC or to obtain the frame structure configuration of other cell groups in the network.
9. Judging whether the frame structures of other cell groups are contained in a non-matched frame structure list or not by the cell group, and if so, executing the step 3; otherwise, the adjustment is considered to be feasible, and then step 10 is executed;
10. cell group performs frame structure adjustment:
A. if the uplink capacity is limited, continue to determine if the number of X slots in 1 uplink-downlink conversion 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 last X time Slot in each uplink and downlink conversion period is adjusted to be the time Slot with the main behavior, such as Slot format 13.
B. If the downlink capacity is limited, continue to determine if the number of X slots in 1 uplink-downlink conversion period is more than 1? If yes, the first X time Slot in each uplink and downlink conversion period is adjusted to be a D 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 following behavior, such as Slot format 6.
C. If there is no capacity limitation in the cell group, the frame structure of all cells is rolled back to X by one time slot, i.e. one time slot previously adjusted to U or D is rolled back to X time slot.
11. After the frame structure is adjusted, a timer is started. After the next period, i.e. the timer has expired, steps 3-10 are repeated.
The network level regulation reduces inter-group interference, so that the overall performance of the network is improved. Next, inter-group interference coordination may be implemented by means of an existing cross-slot interference avoidance scheme, which is not described here.
Based on the same inventive concept, the 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 that of the frame structure configuration method, the implementation of these devices may refer to the implementation of the method, and the repetition is omitted.
In implementing the technical scheme provided by the embodiment of the invention, the method can be implemented as follows.
Fig. 6 is a schematic structural diagram of a frame structure configuration apparatus, as shown in the drawing, including:
the processor 600, configured to read the program in the memory 620, performs the following procedures:
dividing cell groups;
a base station configured with the same cell group uses a flexible frame structure with the same configuration;
a transceiver 610 for receiving and transmitting data under the control of the processor 600.
In implementation, the cells divided into the same cell group are cells with uplink and downlink service proportion in a preset interval in one statistical period.
In practice, after dividing the cell groups, the flexible frame structure adjustment for each cell group is event-triggered, or event-triggered for a long period.
In practice, one or a combination of the following modes are further included:
monitoring the service flow of each cell, if the capacity of a certain cell is not limited and the current configuration is not the initial configuration, the frame structures of all cells are retracted by one time slot to X;
monitoring the service flow of each cell, if the uplink capacity of a certain cell is limited, and when the X time slot does not exist, no flow monitoring and/or frame structure adjustment are performed in the current adjustment period;
monitoring the service flow of each cell, if the uplink capacity of a certain cell is limited, when more than one X time slot exists, adjusting the last X time slot in each uplink and downlink conversion period to be a U time slot;
monitoring the service flow of each cell, if the uplink capacity of a certain cell is limited, when only one X time slot exists, adjusting the X time slot in each uplink and downlink conversion period to be the time slot with the main action;
monitoring the service flow of each cell, if the downlink capacity of a certain cell is limited, and when the X time slot does not exist, no flow monitoring and/or frame structure adjustment are performed in the current adjustment period;
Monitoring the service flow of each cell, if the downlink capacity of a certain cell is limited, when more than one X time slot exists, adjusting the last X time slot in each uplink and downlink conversion period to be a D time slot;
and monitoring the service flow of each cell, and if the downlink capacity of a certain cell is limited, when only one X time slot exists, adjusting the X time slot in each uplink and downlink conversion period to be the time slot with the following main action.
In an implementation, after the time slot adjustment, the method further includes:
other cells within the cell group are notified to make the same adjustments.
In practice, further comprising:
and determining whether to carry out flexible frame structure adjustment on the cell group according to the capacity limited condition of each cell in the cell group.
In practice, further comprising:
before the cell group adjusts the frame structure, according to the stored frame structure matching relation, when the flexible frame structures used by other cell groups are determined to be unmatched, the flexible frame structure of the cell group is adjusted; and/or the number of the groups of groups,
when the interference level between the cell group and other cell groups exceeds a preset threshold after the cell group adjusts the frame structure, the adjusted frame structure is retracted to be before adjustment.
In practice, the flexible frame structure used by other cell groups is obtained through information interaction among the cell groups or obtained through OMC.
In practice, further comprising:
and acquiring the flexible frame structures used by other cell groups in a preset period, wherein only one cell group in one period is used for acquiring the flexible frame structures used by other cell groups.
In practice, further comprising:
when monitoring the interference level between the local cell group and other cell groups, negotiating the flexible frame structure used with the other cell groups with interference if the preset threshold is exceeded.
In practice, further comprising:
and determining whether to carry out flexible frame structure adjustment on the cell group according to the capacity limited condition of the cell group level.
Wherein in fig. 6, a bus architecture may comprise any number of interconnected buses and bridges, and in particular one or more processors represented by processor 600 and various circuits of memory represented by memory 620, linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. Transceiver 610 may be a number of elements, including a transmitter and a receiver, providing 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 group;
and the configuration module is used for configuring the base stations of the same cell group to use the same configured flexible frame structure.
Specific implementation can be seen in the implementation of the frame structure configuration method.
For convenience of description, the parts of the above apparatus are described as being functionally divided into various modules or units, respectively. Of course, the functions of each module or unit may be implemented in the same piece or pieces of software or hardware when implementing the present invention.
The embodiment of the invention also 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.
Specific implementation can be seen in the implementation of the frame structure configuration method.
In summary, in the technical solution provided in the embodiment of the present invention, a two-stage regulation scheme based on a flexible frame structure is provided, namely, network-level regulation and cell group-level regulation.
And carrying out unified configuration and adjustment based on a flexible frame structure according to the flow statistics of the cell group, and avoiding cross time slot interference in the group.
The network level regulation judges or monitors the interference among the cell groups, so that interference coordination is carried out, and the overall performance of the network is improved.
The use mode of statistical analysis is expanded for dynamic adjustment of 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 hot spot network, the capacity requirement of the vertical industry is not high, so that 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 monitor the capacity and adjust the frame structure. Each frame structure adjustment of the 5G hot spot cell group is performed based on the result of the network level regulation.
Further, to meet more flexible service requirements, different uplink and downlink conversion periods, different slot format combinations can be configured for the cell, and even symbol level adjustment can be realized based on flexible symbols.
It will be appreciated by those skilled in the art that 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, magnetic 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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 modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (18)
1. A frame structure configuration method, comprising:
dividing cell groups;
a base station configured with the same cell group uses a flexible frame structure with the same configuration;
the cells divided into the same cell group are cells with uplink and downlink service proportion in a preset interval in one statistical period;
further comprising one or a combination of the following means:
monitoring the service flow of each cell, if the capacity of a certain cell is not limited and the current configuration is not the initial configuration, the frame structure of all cells is retracted by one time slot towards the flexible time slot X time slot;
Monitoring the service flow of each cell, if the uplink capacity of a certain cell is limited, and when the X time slot does not exist, no flow monitoring and/or frame structure adjustment are performed in the current adjustment period;
monitoring the service flow of each cell, if the uplink capacity of a certain cell is limited, when more than one X time slot exists, adjusting the last X time slot in each uplink and downlink conversion period to be a U time slot;
monitoring the service flow of each cell, if the uplink capacity of a certain cell is limited, when only one X time slot exists, adjusting the X time slot in each uplink and downlink conversion period to be the time slot with the main action;
monitoring the service flow of each cell, if the downlink capacity of a certain cell is limited, and when the X time slot does not exist, no flow monitoring and/or frame structure adjustment are performed in the current adjustment period;
monitoring the service flow of each cell, if the downlink capacity of a certain cell is limited, when more than one X time slot exists, adjusting the last X time slot in each uplink and downlink conversion period to be a D time slot;
and monitoring the service flow of each cell, and if the downlink capacity of a certain cell is limited, when only one X time slot exists, adjusting the X time slot in each uplink and downlink conversion period to be the time slot with the following main action.
2. The method of claim 1, wherein the flexible frame structure adjustment for each cell group is event-triggered after dividing the cell group or is event-triggered for a long period.
3. The method of claim 1, further comprising, after the time slot adjustment:
other cells within the cell group are notified to make the same adjustments.
4. The method as recited in claim 1, further comprising:
and determining whether to carry out flexible frame structure adjustment on the cell group according to the capacity limited condition of each cell in the cell group.
5. The method as recited in claim 1, further comprising:
before the cell group adjusts the frame structure, according to the stored frame structure matching relation, when the flexible frame structures used by other cell groups are determined to be unmatched, the flexible frame structure of the cell group is adjusted; and/or the number of the groups of groups,
when the interference level between the cell group and other cell groups exceeds a preset threshold after the cell group adjusts the frame structure, the adjusted frame structure is retracted to be before adjustment.
6. The method of claim 5, wherein the flexible frame structure used by other cell groups is obtained through inter-cell group information interaction or is obtained through an operation management center OMC.
7. The method as recited in claim 6, further comprising:
and acquiring the flexible frame structures used by other cell groups in a preset period, wherein only one cell group in one period is used for acquiring the flexible frame structures used by other cell groups.
8. The method as recited in claim 5, further comprising:
when monitoring the interference level between the local cell group and other cell groups, negotiating the flexible frame structure used with the other cell groups with interference if the preset threshold is exceeded.
9. A frame structure configuration apparatus, comprising:
a processor for reading the program in the memory, performing the following process:
dividing cell groups;
a base station configured with the same cell group uses a flexible frame structure with the same configuration;
a transceiver for receiving and transmitting data under the control of the processor;
the cells divided into the same cell group are cells with uplink and downlink service proportion in a preset interval in one statistical period;
further comprising one or a combination of the following means:
monitoring the service flow of each cell, if the capacity of a certain cell is not limited and the current configuration is not the initial configuration, the frame structures of all cells are retracted by one time slot to X;
Monitoring the service flow of each cell, if the uplink capacity of a certain cell is limited, and when the X time slot does not exist, no flow monitoring and/or frame structure adjustment are performed in the current adjustment period;
monitoring the service flow of each cell, if the uplink capacity of a certain cell is limited, when more than one X time slot exists, adjusting the last X time slot in each uplink and downlink conversion period to be a U time slot;
monitoring the service flow of each cell, if the uplink capacity of a certain cell is limited, when only one X time slot exists, adjusting the X time slot in each uplink and downlink conversion period to be the time slot with the main action;
monitoring the service flow of each cell, if the downlink capacity of a certain cell is limited, and when the X time slot does not exist, no flow monitoring and/or frame structure adjustment are performed in the current adjustment period;
monitoring the service flow of each cell, if the downlink capacity of a certain cell is limited, when more than one X time slot exists, adjusting the last X time slot in each uplink and downlink conversion period to be a D time slot;
and monitoring the service flow of each cell, and if the downlink capacity of a certain cell is limited, when only one X time slot exists, adjusting the X time slot in each uplink and downlink conversion period to be the time slot with the following main action.
10. The apparatus of claim 9, wherein flexible frame structure adjustments for each cell group after dividing the cell group are event-triggered or are event-triggered for a long period.
11. The apparatus of claim 9, further comprising, after the time slot adjustment:
other cells within the cell group are notified to make the same adjustments.
12. The apparatus as recited in claim 9, further comprising:
and determining whether to carry out flexible frame structure adjustment on the cell group according to the capacity limited condition of each cell in the cell group.
13. The apparatus as recited in claim 9, further comprising:
before the cell group adjusts the frame structure, according to the stored frame structure matching relation, when the flexible frame structures used by other cell groups are determined to be unmatched, the flexible frame structure of the cell group is adjusted; and/or the number of the groups of groups,
when the interference level between the cell group and other cell groups exceeds a preset threshold after the cell group adjusts the frame structure, the adjusted frame structure is retracted to be before adjustment.
14. The apparatus of claim 13, wherein the flexible frame structure used by other cell groups is obtained through inter-cell group information interaction or is obtained through OMC.
15. The apparatus as recited in claim 14, further comprising:
and acquiring the flexible frame structures used by other cell groups in a preset period, wherein only one cell group in one period is used for acquiring the flexible frame structures used by other cell groups.
16. The apparatus as recited in claim 13, further comprising:
when monitoring the interference level between the local cell group and other cell groups, negotiating the flexible frame structure used with the other cell groups with interference if the preset threshold is exceeded.
17. A frame structure configuration apparatus, comprising:
the dividing module is used for dividing the cell group;
a configuration module, configured to configure a base station of the same cell group to use a flexible frame structure of the same configuration;
the cells divided into the same cell group are cells with uplink and downlink service proportion in a preset interval in one statistical period;
further comprising one or a combination of the following means:
monitoring the service flow of each cell, if the capacity of a certain cell is not limited and the current configuration is not the initial configuration, the frame structure of all cells is retracted by one time slot towards the flexible time slot X time slot;
monitoring the service flow of each cell, if the uplink capacity of a certain cell is limited, and when the X time slot does not exist, no flow monitoring and/or frame structure adjustment are performed in the current adjustment period;
Monitoring the service flow of each cell, if the uplink capacity of a certain cell is limited, when more than one X time slot exists, adjusting the last X time slot in each uplink and downlink conversion period to be a U time slot;
monitoring the service flow of each cell, if the uplink capacity of a certain cell is limited, when only one X time slot exists, adjusting the X time slot in each uplink and downlink conversion period to be the time slot with the main action;
monitoring the service flow of each cell, if the downlink capacity of a certain cell is limited, and when the X time slot does not exist, no flow monitoring and/or frame structure adjustment are performed in the current adjustment period;
monitoring the service flow of each cell, if the downlink capacity of a certain cell is limited, when more than one X time slot exists, adjusting the last X time slot in each uplink and downlink conversion period to be a D time slot;
and monitoring the service flow of each cell, and if the downlink capacity of a certain cell is limited, when only one X time slot exists, adjusting the X time slot in each uplink and downlink conversion period to be the time slot with the following main action.
18. 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 8.
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