CN101437292A - Method and apparatus for scheduling time frequency resource of OFDM system - Google Patents

Abstract

The invention discloses a method and device for scheduling time-frequency resources in an OFDM system. The number of zones S, divide the available time-frequency resources into N×S time-frequency resource block groups; when performing time-frequency resource allocation, according to the actual traffic of each sector, divide the N×S time-frequency resource block groups Part or all of the group is allocated to each sector in each cell, wherein the time-frequency resource block groups allocated to each sector are different from each other, and the time-frequency resource block groups allocated to each sector are different from each other and The priority of the time-frequency resource block group allocated to each sector is set from high to low according to the order of allocation; the base station in each cell is set according to the priority of the time-frequency resource block group allocated to each sector in the cell. In order of high to low, assign the time-frequency resource blocks in the time-frequency resource block group to the required service use.

Description

A method and device for scheduling time-frequency resources in an OFDM system

technical field

The invention relates to the field of wireless communication, in particular to a method and device for scheduling time-frequency resources in an orthogonal frequency division multiplexing system.

Background technique

Orthogonal Frequency Division Multiplexing (OFDM) technology was proposed in the 1960s as a high-speed transmission technology for wireless communication systems. In recent years, with the rapid development of digital signal processing technology and integrated circuit technology, the The technology has been applied in a variety of communication standards, such as IEEE 802.16 series standards, 3GPP Long-Term Evolution (LTE), etc., and it is also expected to become a mainstream key technology in the next-generation mobile communication system IMT-Advanced.

Like other cellular communication systems, the OFDM system also needs to determine the frequency reuse mode and perform frequency planning during network planning, among which:

Frequency reuse is realized based on the characteristics of radio wave propagation path loss, and its unit is carrier. When the distance between two base stations is far enough, the carrier frequency used for one base station can be reused by the carrier frequency of another base station, thereby improving spectrum efficiency. The area covered by each base station is called a cell, and cells that use the same frequency are called co-frequency cells. The distance D between these same-frequency cells is called the frequency reuse distance. In the design, the frequency reuse distance D must be far enough to make the co-subchannel interference level low enough to ensure the coverage quality.

The basic unit of frequency planning is a cell cluster, and frequency reuse is performed within the coverage area with the cluster as a unit. A cluster is a collection of N cells. These N cells use all the available spectrum resources, but the operating frequency of each cell is different. The distribution mode and frequency allocation scheme of each cell in the cluster determine the frequency reuse mode.

In existing resource management and scheduling methods, no plan has been made for the time-frequency two-dimensional characteristic of OFDM/OFDMA resource management, thus limiting the interference suppression effect between cells.

Contents of the invention

Embodiments of the present invention provide a method and system for scheduling time-frequency resources in an OFDM system, so as to solve the inter-cell interference caused by not performing resource scheduling for the time-frequency two-dimensional characteristics of resource management in the prior art The problem of poor suppression effect.

The method for scheduling time-frequency resources in an OFDM system provided by an embodiment of the present invention includes:

Divide available time-frequency resources into N×S time-frequency resource block groups in advance according to the number N of cells contained in the cluster in the system and the number S of sectors contained in each cell;

When performing time-frequency resource allocation, according to the actual traffic volume of each sector, part or all of the N×S time-frequency resource block groups are allocated to each sector in each cell, wherein each sector is The allocated time-frequency resource block groups are different from each other, and the time-frequency resource block groups allocated to each sector are different from each other, and the priority of the time-frequency resource block groups allocated to each sector is from high to high according to the order of allocation. to a low setting;

The base station in each cell assigns the time-frequency resource blocks in the time-frequency resource block groups to the required service according to the priority order of the time-frequency resource block groups assigned to each sector in the cell from high to low.

The scheduling system of the time-frequency font in the OFDM system provided by the embodiment of the present invention includes:

A resource configuration module, configured to receive and store available time-frequency resource information, where the available time-frequency resource information includes part or all of the time-frequency resource block group information in the N×S time-frequency resource block groups, where The time-frequency resource block groups allocated to each sector are different from each other, and the time-frequency resource block groups allocated to each sector are different from each other, and the priority of the time-frequency resource block groups allocated to each sector is in accordance with the order of allocation The order is set from high to low; among them, N is the number of cells, and S is the number of sectors contained in each cell;

The resource scheduling module is used to assign the time-frequency resource blocks in the time-frequency resource block groups to the required business use.

In the above-mentioned embodiments of the present invention, the time-frequency resource block groups are assigned to each sector and the priority of the time-frequency resource block groups is set, and resource scheduling is performed according to the priority of the resource block groups, so that the same The priority of resource block group numbers is different, so that the probability of using the same resource block in different sectors at the same time is greatly reduced, which can effectively reduce the degree of interference in the network, and can not only meet the needs of business volume changes, but also ensure coverage quality. Furthermore, since the time-frequency resource block group has two-dimensional characteristics of time and frequency, the granularity of resource scheduling is reduced compared with the resource scheduling method in the prior art, thereby improving the interference suppression effect between cells.

Description of drawings

Fig. 1 is the multiplexing pattern figure of OFDMA system (N=4, S=3) in the embodiment of the present invention;

Fig. 2 is a schematic diagram of allocating one set of resource block groups per sector in the system shown in Fig. 1;

Fig. 3 is a schematic diagram of allocating two groups of resource block groups per sector in the system shown in Fig. 1;

FIG. 4 is a schematic diagram of allocating 4 sets of resource block groups per sector in the system shown in FIG. 1;

FIG. 5 is a schematic diagram of resource block groups actually used by each sector in an embodiment of the present invention;

Fig. 6 is a schematic diagram of temporarily borrowing a group of resource block groups from a sector with high traffic volume in the same cell in an embodiment of the present invention from an adjacent sector with low traffic volume;

Fig. 7 is a schematic diagram of temporarily borrowing a set of resource block groups from two adjacent sectors with low traffic volume by a sector with high traffic volume in the same cell in an embodiment of the present invention;

FIG. 8 is a schematic diagram of resource block group coverage allocation when each sector of a cell uses a set of resource block groups in an embodiment of the present invention;

FIG. 9 is a schematic diagram of resource block group coverage allocation when each sector of a cell uses two sets of resource block groups in an embodiment of the present invention;

FIG. 10 is a schematic diagram of resource block group coverage allocation when each sector of a cell uses three sets of resource block groups in an embodiment of the present invention;

FIG. 11 is a schematic diagram of resource block group coverage allocation when each sector of a cell uses four resource block groups in an embodiment of the present invention;

FIG. 12 is a schematic structural diagram of a time-frequency resource scheduling system in an OFDM system according to an embodiment of the present invention.

Detailed ways

The embodiment of the present invention aims at the time-frequency two-dimensional characteristics of OFDM/OFDMA system resource management and scheduling, proposes a time-frequency unit-resource block scheduling method based on resource management, and proposes OFDM/OFDMA dynamic time frequency scheduling method. The scheduling method provided by the embodiment of the present invention not only absorbs the advantages of the traditional frequency scheduling method, but also strengthens the pertinence of OFDM/OFDMA technology. The dynamic programming method further improves the performance of planning, and better controls and manages OFDM/OFDMA groups. Internet interference.

Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

In OFDM/OFDMA systems, resource management and scheduling are time-frequency two-dimensional. In terms of time, scheduling management is generally performed in units of time slots or symbols, and in terms of frequency, processing is often performed in units of multiple subcarriers. One time resource processing unit × one frequency resource processing unit constitutes the minimum granularity of a resource scheduling management. In the 3GPP LTE standard, this time-frequency scheduling management unit is called a resource block, and 1 resource block = (12 15kHz or 24 7.5kHz subcarriers) × 1 time slot. In the IEEE 802.16e standard, resource blocks are not directly defined, but resource scheduling management is also performed in a time-frequency manner. The time unit is a symbol, 1 symbol = 102.9ms, and the frequency unit is a combination of subcarriers—subchannels. In the embodiment of the present invention, the method in the 3GPP LTE standard is adopted, and the smallest unit of time-frequency management scheduling is called a resource block. This method is also applicable to other OFDM systems such as WiMAX.

In the embodiment of the present invention, in order to make the coverage of each cell use all available time-frequency resources, the available time-frequency resources need to be divided into N×S (N represents the number of cells, S represents the number of sectors in each cell) groups Resource block groups. When these resource block groups are allocated to each sector of each cell, all resource block groups can be allocated to each cell through multiple allocation processes. Allocate one set of resource block groups to each sector at a time, and set the priority of the resource block groups allocated to each sector, so that the priority of the resource block groups in each sector is from high to low according to the order of allocation In each allocation process, the resource block groups allocated among the sectors are different from each other, and the resource block groups allocated in each sector are also different.

The following uses the time-frequency multiplexing mode diagram of the OFDMA system shown in FIG. 1 as an example for description. There are 4 clusters in the time-frequency multiplexing mode diagram of the OFDMA system shown in Figure 1, respectively marked as A, B, C, and D; each cluster has 4 cells (the coverage of a base station is a cell) , that is, N=4, respectively denoted as B ₁ , B ₂ , B ₃ , B ₄ , and the coverage of each cell is divided into 3 sectors, namely S=3, denoted as S _{i, 1} and S _i respectively _{, 2} , S _{i, 3} (1≤i≤4). For the OFDMA system shown in Figure 1, in order to make the coverage of each cell use all available time-frequency resources in the embodiment of the present invention, the available time-frequency resources are divided into N×S=12 resource block groups, and each The sequence number of the group resource block group is recorded as 1, 2, ..., 12. In the process of allocating 12 groups of resource block groups to each cell, each allocation process is:

The first allocation: allocate the first group of resource block groups to each sector of each cell in the cluster, set the priority of the resource block groups allocated in each sector, so that the first group of resources allocated to each sector The priority of the block group is set to be the highest in the respective sector. The results of the first assignment are shown in Table 1:

Table 1

It can be seen from Table 1 that each sector is assigned a set of resource block groups, and the resource block groups among all sectors are different. The resource block group numbers between sectors of the same cell differ by 4. Set the priority level of each resource block group allocated this time as the highest priority level in each sector, which is recorded as level 1. At this time, a schematic diagram of allocation of resource block groups is shown in FIG. 2 , wherein S _{i, j} (1≤i≤4, 1≤j≤3) represents a sector, and the number after the colon represents the number of the resource block group.

The second allocation: allocate the second resource block group to each sector of each cell in the cluster, set the priority of the resource block group allocated in each sector, so that the second group of resources allocated to each sector The priority of the block group in each sector is next to the priority of the first group of resource block groups. The second resource block group is allocated to each sector, and the allocation method is:

Since the second group of resource block groups is the secondary multiplexing of resource block groups in the cluster, the multiplexing distance is lower than that of the first group, so the priority of the second group of resource block groups is ranked after the first group of resource block groups . The allocation results of the resource block groups this time are shown in Table 2. The resource block groups in the sector are arranged in order of priority from high to low, separated by "/" in the middle. After the second resource block group multiplexing is completed, each A schematic diagram of sector resource block group allocation is shown in FIG. 3 .

Table 2

The third allocation: allocate the third group of resource block groups to each sector of each cell in the cluster, set the priority of the resource block groups allocated in each sector, and make the third group of resources allocated to each sector The priority of the block group in each sector is next to the priority of the second group of resource block groups. Assign the third group of resource block groups to each sector, and the allocation method is:

Since the third group of resource block groups is the re-multiplexing of resource block groups in the cluster, the multiplexing distance is lower than that of the first and second groups, so the priority of the third group of resource block groups is ranked in the first and second group resources after the block group. The allocation results of the resource block groups this time are shown in Table 3. The resource block groups in the sector are arranged in order of priority from high to low, separated by "/" in the middle.

table 3

The fourth allocation: allocate the fourth group of resource block groups to each sector of each cell in the cluster, set the priority of the resource block groups allocated in each sector, and make the fourth group of resources allocated to each sector The priority of the block group in each sector is next to the priority of the third group of resource block groups. For each sector, the fourth resource block group is allocated, and the allocation method is as follows:

Since the fourth group of resource block groups is the re-multiplexing of resource block groups in the cluster, the multiplexing distance is lower than that of the first, second, and third groups, so the priority of the fourth group of resource block groups is ranked first and second , After 3 groups of resource block groups. The allocation results of resource block groups this time are shown in Table 4. The resource block groups in the sector are arranged in order of priority from high to low, separated by "/" in the middle. After the fourth resource block group multiplexing is completed, each A schematic diagram of sector resource block group allocation is shown in FIG. 4 .

Table 4

It can be seen from Table 4 that the 4 groups of resource block groups assigned to the same sector number of each cell are the same, but the usage priorities are different. If the groups of resource block groups in the same sector have no order of use and are used completely randomly, severe resource block group overlap will occur, increasing the degree of interference. However, due to the introduction of priority in the above-mentioned allocation method, it is possible to realize that the degree of multiplexing changes with the dynamic change of the capacity, and the degree of interference is reduced.

In the above-mentioned embodiment, it is a time-frequency joint planning method for an OFDMA system with the number of cells in the cluster N=4 and the number of sectors S=3. This method can be extended to any cluster where the number of cells is N and the number of sectors is N. The time-frequency joint planning for the OFDMA system of S follows the following principles: After numbering the N×S time-frequency resource block groups in sequence, each sector is assigned one resource block group each time through N allocations. A sector allocates N resource block groups, wherein, in the first allocation, the time-frequency resource block groups numbered i, i+N, i+(S-1)×N are correspondingly allocated to each sector in the i-th cell area, where 1≤i≤N; each subsequent allocation, the time-frequency resource block group allocated to each sector in the Mth cell is the time-frequency resource block allocated to the corresponding sector in the M+1th cell in the previous time group, the group of time-frequency resource blocks allocated to each sector in the Nth cell is the group of time-frequency resource blocks allocated to the corresponding sector in the first cell last time, where 1≤M<N.

In another embodiment of the present invention, the allocation of resource block groups between the sectors of the cells in the cluster needs to be repeated for many times until the number of resource block groups allocated in each sector is N, and the new The allocated resource block groups are determined as follows: when the number of allocated resource block groups in each sector of each cell is 0, each sector of each cell is allocated a group of resource block groups that are different from each other; When the number of allocated resource block groups in each sector of each cell is less than N, the allocation is performed as follows: each sector in the i-th cell (1≤i≤N) multiplexes the h-th cell (1≤i≤N) h≤N, h≠i, and the resource block group of the h cell has never been multiplexed to the resource block group allocated by the sector with the same number in the i cell). The priority order among the newly reused resource block groups remains unchanged, but the priority is arranged after those resource block groups that have been allocated. When allocating resource block groups, if a newly allocated resource block group is duplicated with an already allocated resource block group, the resource block group will not be added to the resource block group allocated to the sector this time. When the resource block group is allocated, it can also be allocated according to the business volume of each sector. For example, when the business volume is small, when one set of resource block groups can meet the business requirements, the resource block group can be allocated only once , according to the increase of the business volume, the resource block groups can be allocated multiple times in succession.

When the base station in the cell needs to assign time-frequency resources for services, the time-frequency resource block groups in the time-frequency resource block group are allocated according to the priority order of the time-frequency resource block groups assigned to each sector in the cell where the base station is located. The frequency resource blocks are assigned to the required business use. The use order of resource blocks in the same resource block group can be preset, for example, the set order can be a random order, according to the order of resource block numbers from large to small or from small to large.

From the above description, it can be seen that since resource block groups are used in accordance with the order of priority, through the time-frequency joint planning method of the OFDMA system provided by the above embodiments of the present invention, the same resource block group numbers allocated in different sectors The priority is different, so that the probability of using the same resource block in different sectors at the same time is greatly reduced, which can effectively reduce the degree of interference in the network, and can not only meet the needs of business volume changes, but also ensure the coverage quality.

In the time-frequency resource planning method described in the above-mentioned embodiments of the present invention, other auxiliary methods may be further added, so that the application range of the time-frequency resource scheduling method is wider and the effect is better. For example, time-frequency resource planning may be performed by temporarily borrowing resource block groups between sectors of the same cell, or/and using other auxiliary methods such as dynamic allocation of resource block group coverage.

In another embodiment of the present invention, resource block groups between sectors of the same cell can be temporarily borrowed. As shown in Figure 5, sector S _{i, 1} (1≤i≤4) of cell B _i has a relatively large traffic volume, and uses two sets of resource block groups (number: 1/2), sector S _{i, 2} Sector S _{i, 3} has a small traffic volume, and currently only uses one set of resource block groups, where sector S _{i, 2} uses resource block group numbered 5, and sector S _{i, 2} uses resource block group numbered 9 block group. When the traffic volume of sector S _{i, 1} gradually increases and the third resource block group needs to be added, if the traffic volume of the other two sectors does not change significantly, according to the above scheduling method, the third priority resource block group should be enabled 3. However, since the resource block groups 6 and 10 of the second priority in sectors S _{i, 2} and S _{i, 3} are not used, the interference caused by using the resource block groups of the second priority is lower than Use the 3rd priority resource block group. Therefore, at this time, sector S _i,1 can temporarily borrow its second-priority idle resource block group 6 from sector S _i,2 (that is, the base station of the cell temporarily allocates resource block group 6 to sector S _{i , 2} is used), at this time, the schematic diagram of resource block group allocation of the cell is shown in FIG. 6 . When the traffic volume of sector S _{i, 1} continues to increase and the fourth resource block group needs to be added, if the traffic volume of the other two sectors still does not change significantly, then sector S _{i, 1} can report to sector S _{i, 3} temporarily borrows its second-priority idle resource block group 10 , and the resource block group allocation diagram of the cell at this time is shown in FIG. 7 . The priority of the resource block group borrowed by sector S _{i, 1} in the original sector is the same as the resource block group with the lowest priority in sector S _{i, 1} , and the priority of the borrowed resource block group is maintained, but its It is placed after resource block groups of the same priority in sector S _{i,1 and} used.

From the above description, it can be known that the introduction of resource block group priority realizes the dynamic change of the multiplexing degree with the capacity, and adapts to the dynamic change of network capacity, while the temporary borrowing method of resource block groups enhances the capacity distribution among different sectors in the cell. Uniform adaptability and adaptability to drastic changes in sectoral services.

Due to the different multiplexing degree and interference degree of different priority resource block groups in each sector. Therefore, in order to increase the multiplexing distance of low-priority resource block groups, the coverage of resource block groups can also be dynamically allocated.

In another embodiment of the present invention, there are two methods for setting the resource block coverage in the same resource block group: (1) the same coverage method, that is: each resource block covers the same area; (2) different coverage The scope method, that is, sub-areas are further divided according to the distance from the base station in the coverage area, and the sub-areas are allocated according to the priority of actual use. The base station in the cell can first use the first method to set the coverage area of the resource block group, and then adjust the coverage area of the resource block group accordingly when the traffic volume changes and the number of resource block groups used needs to be adjusted. In the second method, the cell base station can divide the sector into n which is the same as the number of resource block groups actually in use in the sector according to the number n of resource block groups in use in the sector and the distance from the base station The band-shaped areas are sorted from high to low in priority, and the coverage areas of resource block groups are allocated from outside to inside. The high-priority resource block group covers the outer area of the sector, and the low-priority resource block group covers the inner area of the sector. The multiplexing distance of the low-priority resource block group is small, and the short-distance coverage area is allocated, which reduces the working power, reduces the degree of interference, and improves the coverage quality.

In the following, the dynamic adjustment process of coverage will be further described by taking cell B ₁ in the above N=4, S=3 system as an example:

As shown in Figure 8, according to the traffic requirements, each sector in the cell _B1 uses a set of resource block groups, and the coverage of the resource block groups is the entire sector at this time;

As shown in FIG. 9 , according to the demands of traffic, each sector in the cell B ₁ needs to use two sets of resource block groups, and each sector is also divided into inner and outer areas. High-priority resource block groups 1, 5, and 9 cover the external areas of their respective sectors, and low-priority resource block groups 2, 6, and 10 cover the internal areas of their respective sectors;

As shown in FIG. 10 , according to the traffic requirements, each sector in cell B ₁ needs to use three sets of resource block groups, and each sector is correspondingly divided into inner, middle and outer areas. High-priority resource block groups 1, 5, and 9 cover the outer areas of their respective sectors, second-priority resource block groups 2, 6, and 10 cover the central area of their respective sectors, and third-priority resource block groups 3, 7, and 11 cover The internal areas of the respective sectors;

As shown in Figure 11, according to the traffic requirements, each sector in cell _B1 uses four groups of resource block groups, and each sector is divided into four parts according to the distance from the base station, and correspondingly assigned to resource block groups with different priorities .

For the above-mentioned embodiments of the present invention, one point to be explained is that OFDMA frames are divided into uplink frames and downlink frames, and frames in each direction can be divided into service bearing, management and control parts with different coverage and capacity characteristics. For the different requirements of different components in the OFDMA system frame, separate resource block planning can be performed according to the method proposed in the above-mentioned embodiments of the present invention.

表示不大于x的最大整数，按照1、2、...、N×S对资源块组进行编号，资源块组i＝{SC_i-1×L+1，SC_i-1×L+2，...，SC_i×L}，(1≤i≤N×S)。由此，还有M-L×N×S个资源块没有被分配到资源块组中，小区基站可将这些资源块可以用于高业务量基站扩容、室内覆盖或其它用途。For the above-mentioned embodiments of the present invention, if in an OFDMA system in which the number of cells in any cluster is N and the number of sectors is S, the number of resource blocks is M, denoted as SC ₁ , SC ₂ , ..., SC _M , Divide M resource blocks into N×S groups on average, then the number L of resource blocks in each resource block group is

Represents the largest integer not greater than x, numbering resource block groups according to 1, 2, ..., N×S, resource block group i={SC _i-1 ×L+1, SC _i-1 ×L+2 ,..., SC _i ×L}, (1≤i≤N×S). Therefore, there are still ML×N×S resource blocks not allocated to the resource block group, and the cell base station can use these resource blocks for capacity expansion of the base station with high traffic volume, indoor coverage or other purposes.

Another point to be pointed out is that the above-mentioned embodiments of the present invention are described by taking OFDMA as an example, but the method of the present invention is also applicable to other OFDM systems.

Based on the same technical idea, the embodiment of the present invention also provides a system for scheduling time-frequency resources in an OFDM system.

Referring to FIG. 12 , it is a schematic structural diagram of a scheduling device 1 for time-frequency resources in an OFDM system provided by an embodiment of the present invention. The device includes: a resource configuration module 11 and a resource scheduling module 12. The scheduling device 1 can be configured in base station equipment. In the scheduling device 1:

The resource configuration module 11 can receive the time-frequency resource information configured by the system or manually configured by the scheduling device 1, and the time-frequency resource information includes part or all of the N×S time-frequency resource block groups Time-frequency resource block group information, and configure it through the process of allocating time-frequency resource block groups for each sector one or more times, wherein each sector is allocated one time-frequency resource block group and each sector is allocated The time-frequency resource block groups are different from each other, the time-frequency resource block groups allocated to each sector are different from each other, and the priority of the time-frequency resource block groups allocated to each sector is from high to low according to the order of allocation Setting; wherein, N is the number of cells, and S is the number of sectors contained in each cell. The resource configuration module 11 can configure all the time-frequency resource block group information in the N×S time-frequency resource block groups to the cell where the scheduling device 1 is located by receiving the resource configuration process N times during the resource configuration process; or, By receiving M times of resource allocation processes, the information of part of the time-frequency resource block groups in the N×S time-frequency resource block groups is allocated to the cell where the scheduling device 1 is located, where 1≤M<N.

The resource scheduling module 12 is configured to assign the time-frequency resource blocks in the time-frequency resource block groups to the time-frequency resource block groups assigned to each sector in the cell where the scheduling device 1 is located, in order of priority from high to low. required business use.

When the time-frequency resource block group allocated in a certain sector of the cell where the resource scheduling module 12 is located is not enough to provide data transmission capacity, and the time-frequency resource block group allocated in other sectors of the cell still exists When the time-frequency resource block group with the lowest priority in the sector is of the same level as the idle time-frequency resource block group, the resource scheduling module 12 allocates the idle time-frequency resource block group to the certain sector and keeps the idle time-frequency resource block group The priority of the group, and the idle time-frequency resource block group is used after other time-frequency resource block groups with the same priority.

The above-mentioned resource scheduling module 12 can also divide each sector in each cell into For the corresponding number of strips, the time-frequency resource block groups are allocated to the strips from the outside to the inside according to the order of priority from high to low.

When the available time-frequency resources include M time-frequency resource blocks, and each time-frequency resource block group includes L time-frequency resource blocks, where L is the largest integer that does not exceed the value obtained by M/(N×S); The above-mentioned resource scheduling module 12 may reserve resource blocks other than the N×S time-frequency resource block groups among the available time-frequency resources for use by other specified services.

To sum up, the above-mentioned embodiments of the present invention aim at the time-frequency two-dimensional characteristic of OFDM/OFDMA resource management, and implement time-frequency resource scheduling on the basis of time-frequency two-dimensional joint planning of resource blocks. The solution of the present invention realizes separate planning and resource scheduling for channels with different coverage and capacity requirements in the same network, and supports the dynamic change of resource block group multiplexing degree with system capacity, less co-frequency interference, and simple implementation. For the entire network, planning can be realized in one step, and it is highly adaptable to dynamic changes in coverage and capacity, and does not need to reconfigure the network when the service and capacity of the network change. Compared with the traditional carrier-based frequency planning and scheduling scheme used in the prior art, the granularity of planning and scheduling is too coarse to control co-frequency interference between cells. The above embodiments of the present invention aim at OFDM The time-frequency two-dimensional characteristics of /OFDMA resource management are planned and resource scheduling based on this, taking time resources into consideration, reducing the planning granularity and improving the interference suppression effect between cells.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (10)

1, the dispatching method of running time-frequency resource in a kind of ofdm system, it is characterized in that, according to bunch number of cells N that is comprised in the described system and the number of sectors S that each sub-district is comprised, available running time-frequency resource is divided into N * S time group in advance;

When carrying out time-frequency resource allocating, actual volume according to each sector, to partly or entirely distribute to each sector in each sub-district in described N * S the time group, wherein, different for the time group that each sector is distributed, the priority of the time group that the time group is different and each sector is assigned to that is assigned in each sector is provided with from high to low according to the sequencing that distributes;

The priority order from high to low of the time group that the base station in each sub-district is assigned to according to each sector in the sub-district, place uses to required business the time assignment in the time group.

2, the method for claim 1 is characterized in that, will partly or entirely distribute to each sub-district in described N * S the time group, is specially:

Distribute the time group by N time for each sector, with whole each sub-district of distributing in described N * S the time group;

Perhaps, distribute the time group for each sector, the part in described N * S the time group is distributed to each sub-district by M time, wherein, 1≤M＜N.

3, the method for claim 1 is characterized in that, after distributing the time group for each sector, also comprises:

If the time group that is assigned in first sector of a sub-district is not enough to provide data transmission capacity, and also exist in the time group that is assigned in other sectors of this sub-district with described first sector in the at the same level and idle time group of time group of lowest priority, then the base station of this sub-district is given described first sector with the time set of dispense of described free time and is kept the priority of described idle time group, and the time group of described free time is used after other time groups that have equal priority with it are assigned.

4, the method for claim 1 is characterized in that, after distributing the time group for each sector, also comprises:

The base station of each sub-district is according to the time group quantity of distributing in its sector, in its coverage with this base station be the center from inside to outside will be separately each sector in the sub-district be divided into the belt-like zone of respective numbers, according to priority order from high to low, successively the time set of dispense is given belt-like zone from outside to inside.

5, the method for claim 1 is characterized in that, described available running time-frequency resource comprises M time, comprises L time in each time group, and wherein, L is for being no more than the M/ (maximum integer of institute's value of N * S);

The base station of each sub-district uses to the business of regulation the Resource Block assignment except that N * S time group in the described available running time-frequency resource.

6, the dispatching device of running time-frequency resource in a kind of ofdm system is characterized in that, comprising:

The resource distribution module, be used to receive and store available running time-frequency resource information, described available running time-frequency resource information comprises the part or all of time group information in N * S the time group, wherein, different for the time group that each sector is distributed, the priority of the time group that the time group is different and each sector is assigned to that is assigned in each sector is provided with from high to low according to the sequencing that distributes; Wherein, N is a number of cells, and S is the number of sectors that each sub-district comprised;

The scheduling of resource module is used for the priority order from high to low of the time group that is assigned to according to each sector, sub-district, this dispatching device place, uses to required business the time assignment in the time group.

7, device as claimed in claim 6, it is characterized in that, described resource distribution module is further used for, and by receiving N resource distribution process, the whole time group information configuration in described N * S the time group is given the sub-district at this dispatching device place; Perhaps, by receiving M time resource distribution process, with the sub-district of the part time group information configuration in described N * S the time group to this dispatching device place, wherein, 1≤M＜N.

8, device as claimed in claim 6, it is characterized in that, described scheduling of resource module is further used for, the time group that is assigned in first sector of sub-district, place is not enough to provide data transmission capacity, and also exist in the time group that is assigned in other sectors of this sub-district with described first sector in during the at the same level and idle time group of the time group of lowest priority, give described first sector with the time set of dispense of described free time and keep the priority of described idle time group, and the time group of described free time is used after other time groups that have equal priority with it are assigned.

9, device as claimed in claim 6, it is characterized in that, described scheduling of resource module is further used for, according to the time group quantity in each sector that is assigned to the sub-district, place, in this cell coverage area be with the base station center from inside to outside separately each sector in the sub-district be divided into the belt-like zone of respective numbers, according to priority order from high to low, successively the time set of dispense is given belt-like zone from outside to inside.

10, device as claimed in claim 6 is characterized in that, described available running time-frequency resource comprises M time, comprises L time in each time group, and wherein, L is for being no more than the M/ (maximum integer of institute's value of N * S);

Described scheduling of resource module is further used for, and the resource block reservations except that N * S time group in the described available running time-frequency resource is given other professional uses of appointment.

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