CN107182057B - Inter-cell cooperation method and device in LTE system - Google Patents
Inter-cell cooperation method and device in LTE system Download PDFInfo
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Abstract
The invention discloses a method and a device for inter-cell cooperation in an LTE (Long term evolution) system, wherein the method comprises the following steps: acquiring a resource pre-allocation map of each cell; selecting a CoMP user, and determining a resource block which can be used by the CoMP user according to a resource pre-allocation map of a service cell of the CoMP user; selecting a resource block which is low in interference of a coordinated cell and low in coordination cost as a resource block to be occupied by a CoMP user from all available resource blocks; updating a resource pre-allocation map of a serving cell and a cooperative cell; and selecting the next CoMP user, repeating the process based on the currently updated resource pre-allocation map of each cell until a set termination condition is met, issuing the resource pre-allocation map of each cell to each cell, and performing cooperation control. The invention can effectively solve the problems of cooperation and interference coordination among the CoMP user cells and achieve the effects of improving the frequency efficiency and cell throughput.
Description
Technical Field
The present invention relates to the field of wireless communications, and in particular, to a method and an apparatus for inter-cell cooperation in an LTE (Long Term Evolution) system.
Background
In LTE systems and LTE-a (Long Term Evolution-Advanced) system Evolution, cooperation and interference coordination between cells are increasingly important in order to improve system throughput, especially to improve service quality and throughput at cell edges.
With the rapid growth of 4G users and the increase of data rate and data volume demand of 4G users, 4G mobile networks need to greatly improve system throughput and spectrum efficiency. To meet the above requirements, especially in large venues and dense blocks, the system needs to continuously improve the frequency reuse rate and the spectrum efficiency. An operator builds a heterogeneous network HetNet and deploys dense cells with small inter-station distances.
Dense cells can increase frequency reuse rate, but also increase co-channel interference among cells. Especially for cell edge users, the strong interference of a plurality of adjacent cells can be received, the user data rate and the spectrum efficiency are very low, and the user experience is poor. To address the strong interference problem for edge users, a series of solutions are proposed in the 3GPP LTE and LTE-a standards.
In the current LTE standard and LTE-a standard, cooperation information between eNode bs is transferred through an X2 interface, including interference load status information, user plane data and control information for which a UE needs to be switched, an Almost Blank Subframe Pattern (ABS Pattern), and the like. The eNode B can perform inter-cell interference coordination to a certain extent by using the information, and the current LTE-a standard also supports inter-cell RRM function-based coordination via an X2 interface, for example, inter-cell ICIC coordination via interface interaction with high interference information; ABS pattern information is interacted through an interface, and inter-cell cooperation, interference coordination and the like based on the ABS pattern are carried out.
In the current LTE system and LTE-a system, information between eNode bs is transferred through an X2 interface, including interference load status information, data and control information for which UE needs to be switched, an Almost Blank Subframe Pattern (ABS Pattern), and the like. By utilizing the information, the inter-cell interference coordination can be performed to a certain extent, for example, the current LTE-A system also supports the cooperation based on the RRM function between cells through an X2 interface, for example, the inter-cell ICIC cooperation is performed through the interface interaction high interference information; ABS pattern information is interacted through an interface, and inter-cell cooperation, interference coordination and the like based on the ABS pattern are carried out.
However, only by the above, inter-cell cooperation and interference coordination cannot be performed better, and LTE-a introduces multi-point cooperation (CoMP) to better solve the inter-cell interference problem. An important technical solution in CoMP is Coordinated Scheduling (CS).
For the current CS scheme, a distributed cell resource coordination and interference avoidance scheme is mainly adopted. That is, each cell independently performs scheduling and resource allocation for the UE in the coverage area of the cell, that is, parallel scheduling and resource allocation are performed between the cells. In this way, effective coordination and cooperation cannot be performed among multiple interference source cells of the CoMP user, and resource coordination of the CoMP user may collide, so that resource allocation of the CoMP user cannot be completely orthogonal, and thus performance gain of the CoMP user is limited. Meanwhile, since effective coordination and cooperation cannot be performed among a plurality of interference source cells of the CoMP user, each cell disables a lot of radio resources for coordinating the CoMP user of the interfered cell. This will cause the resource utilization of the system to be seriously reduced, and the overall throughput and performance of the system are affected.
Disclosure of Invention
The invention provides a method and a device for inter-cell cooperation in an LTE (Long term evolution) system, which are used for solving the problem that effective cooperation and interference coordination cannot be carried out among a plurality of interference source cells of a CoMP (coordinated multipoint) user in the prior art.
According to an aspect of the present invention, a method for inter-cell cooperation in an LTE system is provided, including:
and 6, issuing the updated resource pre-allocation map of each cell to the corresponding cell when the termination condition is reached, and performing cooperative control on each cell.
According to another aspect of the present invention, a method for inter-cell cooperation in an LTE system is provided, which is applied to each cell in a cooperation area, and includes:
receiving a resource pre-allocation map of the local cell;
performing resource scheduling according to the resource allocation condition of the resource pre-allocation graph; the resource scheduling comprises: and scheduling CoMP users by using the CoMP UE resources distributed in the resource pre-distribution graph, not scheduling backup resources distributed in the resource pre-distribution graph, and scheduling non-CoMP users by using the residual resources in the resource pre-distribution graph.
According to a third aspect of the present invention, there is provided an apparatus for inter-cell cooperation in an LTE system, comprising:
an obtaining module, configured to obtain a resource pre-allocation map of each cell in a cooperation area; the resource pre-allocation map identifies the property and state of each resource block of a cell, and the property of the resource block comprises: coordinated multipoint (CoMP) UE resources, common resources and backup resources; the states of the resource blocks are all marked as unallocated;
the available resource determining module is used for selecting a CoMP user from the CoMP users and determining a resource block which can be used by the CoMP user according to a resource pre-allocation map of a service cell of the CoMP user;
the resource selection module is used for determining the interference level of each usable resource block by the resource block of the cooperative cell and determining the coordination cost generated by selecting each usable resource block according to the property and the state of the resource block of the cooperative cell of the CoMP user, and selecting the resource block with low interference level and low coordination cost as the resource block to be occupied by the CoMP user from each usable resource block;
an updating module, configured to update the property of the selected resource block in the resource pre-allocation map of the serving cell to a CoMP UE resource, update the status to allocated state, and update the property of the resource block, which is available in the resource pre-allocation map of each cooperating cell and is the same as the selected resource block, to a backup resource, and update the status to allocated state;
the iteration module is used for selecting the next CoMP user from the CoMP users and triggering the available resource determination module based on the currently updated resource pre-allocation map of each cell until the set termination condition is met;
and the cooperation control module is used for issuing the updated resource pre-distribution map of each cell to the corresponding cell when the termination condition is reached, and performing cooperation control on each cell.
According to a fourth aspect of the present invention, there is provided a cell in an LTE system, where the cell is a cell in a cooperation area, the cell including:
a receiving module, configured to receive a resource pre-allocation map of a local cell;
the scheduling module is used for scheduling resources according to the resource allocation condition of the resource pre-allocation graph; the resource scheduling includes: and scheduling CoMP users by using the CoMP UE resources distributed in the resource pre-distribution graph, not scheduling backup resources distributed in the resource pre-distribution graph, and scheduling non-CoMP users by using the residual resources in the resource pre-distribution graph.
The invention has the following beneficial effects:
the method used by the invention can more effectively solve the problems of inter-cell cooperation and interference coordination for CoMP users, and achieves the effect of improving the frequency efficiency and the cell throughput. The invention can continuously and iteratively update the resource pre-allocation map on the basis of the resource pre-allocation map each time, gradually approaches the optimal resource pre-allocation effect, namely occupies as few backup resources as possible and serves more CoMP users. The invention can occupy the backup resources as little as possible and improve the resource utilization rate of the system under the condition of meeting the throughput requirement of the CoMP user.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a diagram of radio resource property partitioning bitmap according to the present invention;
fig. 2 is a flowchart of a method for inter-cell cooperation in an LTE system according to the present invention;
FIG. 3 is a schematic diagram of a method for computing N _ Change in the present invention;
fig. 4 is a resource pre-allocation diagram updated after a certain CoMP user determines to occupy a resource block in the present invention;
FIG. 5 is a resource pre-allocation diagram updated after all CoMP users partition resources in the present invention;
fig. 6 is a block diagram of a device for inter-cell cooperation in an LTE system according to the present invention;
fig. 7 is a block diagram of a cell in an LTE system according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Method embodiment
The embodiment of the invention provides a method for inter-cell cooperation in an LTE system, which is characterized in that the inter-cell resource pre-allocation in the period is determined by iterative updating according to the user requirements in the period on the basis of the inter-cell resource pre-allocation in the period, the requirements of each CoMP user are met by avoiding resources as little as possible, and the problems of inter-cell cooperation and interference coordination are solved.
Specifically, in order to implement the scheme proposed by the embodiment of the present invention, the present invention classifies the properties of the radio resources of the whole system bandwidth into three categories: (1) CoMP UE resources, wherein the CoMP UE resources are used by the CoMP UE pre-allocated to the cell; (2) Backup resources, wherein the backup resources are coordination resources used for avoiding interference on CoMP UE of adjacent cells, and the cells do not send any data on the backup resources; (3) And common resources, wherein the common resources are resources pre-allocated to the non-CoMP UE of the cell for use. As shown in fig. 1, a diagram of a bitmap is divided for radio resource properties. Of course, the names of "backup resource", "CoMP UE resource", etc. mentioned above are used for convenience of description, and those skilled in the art may substitute other names.
Based on the resource property division, the inter-cell cooperation method in the LTE system provided by the embodiment of the present invention is shown in fig. 2, and includes the following steps:
step S201, acquiring a resource pre-allocation map of each cell in a cooperation area; the resource pre-allocation map identifies the property and state of each resource block of a cell, and the property of the resource block comprises: coMP UE resources, common resources, and backup resources; the states of the resource blocks are all marked as unallocated;
in this step, the cells in the coordination area include a serving cell of the CoMP user and strong interference cells for the CoMP user, and in the CS scheme, the coordination needs to be avoided, and these strong interference cells are referred to as coordination cells.
Further, in this step, obtaining a resource pre-allocation map of each cell in the cooperation area specifically includes: detecting whether each cell has a resource pre-allocation map of a previous period, if so, acquiring the resource pre-allocation map of the cell of the previous period, and if not, creating an initial resource pre-allocation map for the cell; and the property of each resource block in the initial resource pre-allocation map is marked as a common resource.
Step S202, selecting a CoMP user from the CoMP users;
step S203, determining resource blocks which can be used by the CoMP user according to the resource pre-allocation map of the service cell of the CoMP user;
specifically, in this step, it is determined that all resource blocks in the resource pre-allocation map of the serving cell are available for the CoMP user.
Step S204, according to the property and the state of the resource block of the coordinated cell of the CoMP user, determining the interference level of each usable resource block by the resource block of the coordinated cell and determining the coordination cost generated by selecting each usable resource block, and selecting the resource block with low interference level and low coordination cost as the resource block to be occupied by the CoMP user from each usable resource block;
in the step, before selecting the resource blocks to be occupied by the CoMP user, preferably, it is determined whether the number of the resource blocks required by the CoMP user reaches the upper limit of the total number of the CoMP UE resources of the serving cell, and if so, the number of the current remaining CoMP UE resources is determined to be the number of the resources used by the CoMP user; otherwise, determining the number of the resource blocks required by the CoMP user as the number of the resources used by the CoMP user.
And after the number of the resources used by the CoMP user is determined, selecting the resource block with low mutual interference with the resource block of the cooperative cell from the usable resource blocks as the resource block to be occupied by the CoMP user according to the determined number of the resources.
Further, in this step, the selecting, from the available resource blocks, the resource block with a low interference level and a low coordination cost as the resource block to be occupied by the CoMP user is preferably implemented as follows:
based on the interference level of each usable resource block by the resource block of the coordinated cell and the coordination cost generated by selecting each usable resource block, performing priority ranking on each usable resource block according to a set ranking strategy; and according to the priority order, selecting the resource blocks occupied by the CoMP user from the available resource blocks.
Specifically, the higher the interference level is, the lower the priority is, otherwise, the higher the priority is, the higher the coordination cost is, the lower the priority is, otherwise, the higher the priority is.
It should be noted that after obtaining the interfered level and the coordination cost, a person skilled in the art may set a ranking policy (ranking algorithm) according to his own needs based on the two parameters, for example, the person skilled in the art may respectively give different weights to the interfered level and the coordination cost to obtain a sum of the interfered level and the coordination cost, and the like, and for a specific ranking algorithm, the person skilled in the art may flexibly set the same according to needs, and the present invention does not uniquely define the same.
Further, in this step, determining an interference level of each available resource block by a resource block of a coordinated cell includes:
determining the property and the state of the resource block which is the same as the usable resource block in each cooperative cell aiming at each usable resource block in the service cell;
calculating the power and the value of interference signals of each distributed cooperative cell, wherein the property of the determined resource block of a CoMP user is CoMP UE resource, and the state of the determined resource block is the CoMP UE resource, so as to obtain the interference level of the usable resource block interfered by each cooperative cell;
further, in this step, determining a coordination cost generated by selecting each usable resource block includes:
assigning values to resource blocks which are the same as the usable resource blocks in each cooperative cell according to the principle that the common resource assignment which is not assigned is alpha, the backup resource which is not assigned is less than alpha, the CoMP UE resource assignment which is not assigned is more than alpha and the assigned resource assignment is a set standard value, solving the sum of the assignment of the resource blocks of each cooperative cell and obtaining the coordination cost of the usable resource blocks; and the assignment values of the unallocated common resources, the unallocated backup resources and the CoMP UE resources are all larger than the standard values.
Step S205, updating the property of the selected resource block in the resource pre-allocation map of the serving cell to CoMP UE resource and the state to allocated, and updating the property of the resource block which can be used in the resource pre-allocation map of each cooperative cell and is the same as the selected resource block to backup resource and the state to allocated;
step S206, selecting the next CoMP user from the CoMP users, and returning to the step S203 based on the currently updated resource pre-allocation map of each cell until the set termination condition is met;
wherein the set termination condition comprises: the resource number of the CoMP users of each cell in the cooperation area reaches the upper limit or the CoMP users are pre-allocated with resources.
Step S207, the resource pre-allocation map of each cell updated when the termination condition is reached is issued to the corresponding cell, and the cooperation control of each cell is performed.
Preferably, before issuing the resource pre-allocation map, the properties of all resource blocks which are updated when the termination condition is met and in the state of unallocated resource blocks in the resource pre-allocation map of each cell are updated to be common resources, and the states of all resource blocks are updated to be allocated.
Further, an embodiment of the present invention further provides a method for inter-cell cooperation in an LTE system, which is applied to each cell in a cooperation area, and includes the following steps:
In conclusion, the method used by the invention can effectively solve the problems of inter-cell cooperation and interference coordination for CoMP users, and achieves the effect of improving frequency efficiency and cell throughput. The invention can continuously and iteratively update the resource pre-allocation map on the basis of the resource pre-allocation map every time, gradually approaches the optimal resource pre-allocation effect, namely occupies as few backup resources as possible and serves more CoMP users. The invention can occupy the backup resources as little as possible and improve the resource utilization rate of the system under the condition of meeting the throughput requirement of the CoMP user.
In order to illustrate the invention more clearly, a preferred embodiment of the invention is given below, which describes the method of the invention in more detail by disclosing more technical details. It should be noted that the technical details disclosed in the present embodiment are not intended to limit the present invention.
The inter-cell cooperation method provided by the embodiment is suitable for a mobile communication system, especially an LTE-a system. The following is a detailed description of specific steps. The specific implementation steps of this example are as follows:
in this embodiment, n strong interference cells of the CoMP user are respectively CoCell1 and CoCell2 \8230, and these strong interference cells are referred to as cooperative cells.
The preparation method comprises the following steps: if the cell has the resource pre-allocation map of the previous period, the resource pre-allocation map of the previous period is used as a basis, if the cell does not have the resource pre-allocation map of the previous period, an initial resource pre-allocation map is established for the cell, and the properties of all resource blocks in the initial resource pre-allocation map are marked as 'common resources'. The resource blocks of the initial resource pre-allocation map and the flag of the resource blocks of the last period resource pre-allocation map (which can be understood as the state of the resource blocks) are both marked as "not updated (which can be understood as not allocated)".
The first step is as follows: and selecting the CoMP users according to the priorities of the CoMP users.
The second step is that: the interference level IL of each usable resource block of the CoMP user (i.e. the resource block whose flag of the serving cell SerCell is "not updated") is calculated. The interference level IL for the mth resource block is calculated by the following equation:
wherein:
i (k) is the power of the interference signal of the cooperating cell k to which the CoMP user is subjected.
The third step: and calculating a coordination cost factor corresponding to each usable resource block (namely the resource block of which the flag of the serving cell SerCell is not updated) of the CoMP user.
Wherein, the coordination cost factor can be calculated by the number of resource blocks to be changed, N _ change (m).
For the number N _ change (m) of resource blocks to be changed corresponding to the mth usable resource block RBG (m) of the CoMP user, the sum of the number of resources to be changed on the resource block RBG (m) by the cooperative cell of the CoMP user is as follows:
and Mchannel (k) is the k-th cooperative cell of the CoMP user, and the number of resources needs to be changed.
The number Mchange (k) of resources required to be changed for the kth cooperative cell of the CoMP user is calculated as follows:
if the flag on the resource block RBG (m) of the coordinated cell of the CoMP user is "updated", mchange (k) takes a set standard value, which is set to 0 in this embodiment.
If the flag on the resource block RBG (m) of the kth cooperative cell of the CoMP user is not updated:
if the resource block RBG (m) is a "common resource", mchange (k) takes α, which is 1 in this embodiment;
if the resource block RBG (m) is a backup resource, then Mchannel (k) takes gamma; wherein γ is a positive number less than 1;
if the resource block RBG (m) is the CoMP UE resource, taking u by Mchannel (k); wherein u is a positive number greater than 1.
That is to say, for a certain usable resource block of the CoMP user, if the resource block in the resource pre-allocation map of the cooperative cell is a "backup resource" (i.e., the resource block in the previous cycle is also used as an evasive resource, and the cell generally does not schedule the resource block), a smaller factor is taken when the coordination cost factor is calculated this time, so that the CoMP user tends to occupy the resource block; if the resource block in the resource pre-allocation map of the coordinated cell is a "CoMP UE resource" (that is, the resource block in the previous cycle is a resource block of a CoMP user of the cell), a larger factor is taken when the coordination cost factor is calculated this time, so that the CoMP user tends not to occupy the resource block; if the resource block in the resource pre-allocation map of the coordinated cell is a "common resource" (i.e. the resource block in the previous cycle is a common resource of the cell and is used for scheduling non-CoMP users (i.e. UEs not requiring coordination of other cells)), a moderate factor is taken when the coordination cost factor is calculated this time, so that the tendency of the CoMP user to occupy the resource block is moderate.
Examples are as follows:
for a certain CoMP UE in a Serving Cell, there are 4 RBGs such as RBG1, RBG2, RBG3, and RBG4 in the Serving Cell as usable resources. The interfering cells of the CoMP users are Cell1, cell2, and Cell 3. The resource type distribution is shown in fig. 3.
The current state is:
all RBGs of the serving cell are common resources;
the flag of RBG1 of the cells 11 to 3 is updated, the RBG1 of the cell1 is updated to CoMP UE resources, and the cells 2 and 3 are updated to backup resources;
the flag of RBG2 to RBG4 of the cells 11 to 3 is "not updated".
Then in fig. 3, for RBG1, cell1 corresponds to "CoMP UE resources" whose flag is "updated", and Cell2 and Cell3 correspond to "backup resources" whose flag is "updated", then the size of RBG1, n _change (1) is 0.
For RBG2, cell1 and Cell3, the "backup resources" whose flag is "not updated" are corresponded, and for Cell2, the "normal resources" whose flag is "not updated" are corresponded. Thus, for RBG2, the size of N _Change (2) is 1+2 γ.
For RBG3, cell1 and Cell2, the "common resources" whose flag is "not updated" are corresponded, and Cell3 is the "CoMP UE resources" whose flag is "not updated". Thus, for RBG3, the size of N _Change (3) is 2+ u.
For RBG4, cell1, cell2 and Cell3, the common resources are all marked as 'not updated' by flag. Thus, for RBG4, the size of N _Change (4) is 3.
The fourth step: and according to the interference level quantity IL _ RBG and N _ change on each usable resource block, carrying out priority ordering on the usable resource blocks of the CoMP users.
The fifth step: and determining the number of resources used by the CoMP user according to the number of the resource blocks required by the CoMP user and the total upper limit of the CoMP UE resources of the service cell of the CoMP user.
The number of resources used by the CoMP user in this step is:
min (number of resource blocks required by the CoMP user, the number of the remaining CoMP UE resources)
The current residual CoMP resource number is equal to the sum of the upper limit of the total CoMP UE resource number of the CoMP user service cell and the resource block number which is updated and has the property of CoMP UE resource in the current resource distribution diagram of the CoMP user service cell.
And a sixth step: and occupying the corresponding resource blocks according to the number of the resource blocks used by the CoMP user and the priority order of the resource blocks in the fourth step, and updating the resource pre-allocation map.
The operation of updating the resource pre-allocation map is as follows: for the resource blocks i determined to be occupied by the CoMP user, the properties of the resource blocks i of the service cell of the CoMP user are updated to be CoMP UE resources, and the flag is updated to be updated, and for the resource blocks i in the cooperative cell of the CoMP user, the properties of the resource blocks i of which the flag is not updated in the resource blocks i are updated to be backup resources, and the flag is updated to be updated.
Assuming that the CoMP user in the third step determines to use resource block RBG2 in the sixth step, the resource pre-allocation map updated in the sixth step is as shown in fig. 4. Namely: and for the resource block RBG2 occupied by the CoMP user, updating the property of the resource block RBG2 of the service cell of the CoMP user to be 'CoMP UE resource' and updating the flag to be 'updated', updating the property of the resource block RBG2 with the property of 'common resource' in the cooperative cell of the CoMP user to be 'backup resource' and updating the flag to be 'updated', and keeping the property of the resource block RBG2 with the property of 'CoMP UE resource' in the cooperative cell of the CoMP user unchanged. And the flag of the resource block RBG2 with the property of 'backup resource' and the non-updated flag in the coordinated cell of the CoMP user is updated to be updated.
The seventh step: and repeating the second step to the sixth step corresponding to each CoMP user until the resource number of the CoMP users of each cell reaches the upper limit or the CoMP users are pre-allocated and occupied.
Eighth step: and updating the resource pre-allocation map. And updating the properties of all resource blocks with flag being not updated in the resource pre-allocation map of each cell to be common resources, and updating the flag to be updated.
Assuming that the CoMP user in the third step is the CoMP user needing to partition resources finally, and for the CoMP user, it is determined to use resource block RBG2 in the sixth step, and the resource pre-allocation map is updated finally as shown in fig. 5.
The ninth step: and the centralized controller sends the resource pre-allocation map to each cell. And each cell schedules the common UE and the CoMP users and avoids the resources of the CoMP users of other cells needing coordination according to the resource pre-allocation graph.
The names of "common resource", "backup resource", "CoMP UE resource" described in the present invention are merely examples for understanding; it can be labeled by other names such as "type A", "type B", "type C", etc.
The invention can continuously and iteratively update the resource pre-allocation map on the basis of the resource pre-allocation map each time, gradually approaches the optimal resource pre-allocation effect, namely occupies as few backup resources as possible and serves more CoMP users. The invention can only occupy the backup resource possibly less under the condition of meeting the throughput requirement of the CoMP user, thereby improving the resource utilization rate of the system.
Apparatus embodiment
An embodiment of the present invention provides an apparatus for inter-cell cooperation in an LTE system, where the apparatus is an integrated controller, and as shown in fig. 6, the apparatus includes:
an obtaining module 610, configured to obtain a resource pre-allocation map of each cell in a cooperation area; the resource pre-allocation map identifies the property and state of each resource block of a cell, and the property of the resource block comprises: coordinated multipoint (CoMP) UE resources, common resources and backup resources; the states of the resource blocks are all marked as unallocated;
an available resource determining module 620, configured to select a CoMP user from the CoMP users, and determine a resource block that can be used by the CoMP user according to a resource pre-allocation map of a serving cell of the CoMP user;
a resource selection module 630, configured to determine, according to the property and the state of the resource block of the coordinated cell of the CoMP user, an interference level of each available resource block by the resource block of the coordinated cell and a coordination cost generated by selecting each available resource block, and select, from the available resource blocks, a resource block with a low interference level and a low coordination cost as a resource block to be occupied by the CoMP user;
an updating module 640, configured to update the property of the selected resource block in the resource pre-allocation map of the serving cell to a CoMP UE resource, update the status to allocated state, and update the property of the resource block, which is available in the resource pre-allocation map of each cooperating cell and is the same as the selected resource block, to a backup resource, and update the status to allocated state;
an iteration module 650, configured to select a next CoMP user from the CoMP users, and trigger the available resource determining module based on the currently updated resource pre-allocation map of each cell until a set termination condition is met;
and the cooperation control module 660 is configured to issue the resource pre-allocation map of each cell, which is obtained by updating when the termination condition is met, to the corresponding cell, and perform cooperation control on each cell.
Based on the structural framework and the implementation principle, the following provides a plurality of specific and preferred embodiments under the structure, so as to refine and optimize the functions of the device of the invention, and to make the implementation of the scheme of the invention more convenient and accurate. The method specifically comprises the following steps:
in this embodiment, the obtaining module 610 is specifically configured to detect whether each cell has a resource pre-allocation map in a previous period, if yes, obtain the resource pre-allocation map of the cell in the previous period, and if not, create an initial resource pre-allocation map for the cell; and the property of each resource block in the initial resource pre-allocation map is marked as a common resource.
Further, in this embodiment of the present invention, the available resource determining module 620 is specifically configured to determine that all resource blocks in the resource pre-allocation map of the selected serving cell of the CoMP user, which are in the unallocated state, are available resource blocks for the CoMP user.
Further, in this embodiment of the present invention, the resource selecting module 630 further includes:
the sequencing submodule is used for carrying out priority sequencing on each usable resource block according to a set sequencing strategy based on the interference level of each usable resource block by the resource block of the cooperative cell and the coordination cost generated by selecting each usable resource block;
and the resource block selection submodule is used for selecting the resource blocks to be occupied by the CoMP user from the available resource blocks according to the priority order.
Further, in this embodiment of the present invention, the resource selecting module 630 further includes:
the interference level calculation submodule is used for determining the property and the state of each resource block which is the same as each usable resource block in each cooperative cell aiming at each usable resource block in the service cell; calculating the power and the value of interference signals of each distributed cooperative cell, wherein the property of the determined resource block of a CoMP user is CoMP UE resource, and the state of the determined resource block is the CoMP UE resource, so as to obtain the interference level of the usable resource block interfered by each cooperative cell;
a coordination cost calculation sub-module, configured to assign, for each available resource block in the serving cell, the resource block in each coordinated cell that is the same as the available resource block according to a principle that an unassigned common resource is assigned to α, an unassigned backup resource is assigned to less than α, an unassigned CoMP UE resource is assigned to greater than α, and an assigned resource is assigned to a set standard value, to obtain a sum of the assignments of the resource blocks of the coordinated cells, so as to obtain a coordination cost of the available resource block; and the assignment of the unallocated common resources, the backup resources and the CoMP UE resources is larger than the standard value.
Further, in the embodiment of the present invention, the interference level of each resource block available in the serving cell and interfered by each cooperative cell obtained by the interference level calculation sub-module is
In the formula:
Further, in the embodiment of the present invention, the coordination cost generated by selecting each usable resource block in the serving cell, obtained by the coordination cost calculation sub-module, is
If the resource block which is the same as the usable resource block m in the kth cooperative cell of the selected CoMP user is allocated, acquiring a set standard value by Mchannel (k);
if the resource block which is the same as the usable resource block m in the k-th coordinated cell of the selected CoMP user is not allocated, then:
when the property of the resource block is common resource, the Mchange (k) takes alpha;
when the property of the resource block is backup resource, the Mchange (k) takes gamma; wherein γ is less than α;
when the property of the resource block is CoMP UE resource, taking u by Mchannel (k); wherein u is greater than α.
Further, in the embodiment of the present invention, before the resource selection module 630 selects resources from the available resources, it is further determined whether the number of resource blocks required by the CoMP user reaches the upper limit of the total number of CoMP UE resources of the serving cell of the CoMP user, and if so, the number of the remaining CoMP UE resources is determined to be the number of resources used by the CoMP user; otherwise, determining the number of the resource blocks required by the CoMP user as the number of the resources used by the CoMP user; and according to the determined number of the resources, selecting a resource block with low mutual interference with the resource block of the coordinated cell from all the available resource blocks as the resource block to be occupied by the CoMP user.
Further, in this embodiment of the present invention, the termination condition set in the iteration module 650 includes: and the resource number of the CoMP users of each cell in the cooperation area reaches the upper limit or the CoMP users are pre-distributed with resources.
Further, in this embodiment of the present invention, the cooperation control module 660 is specifically configured to update the properties of all resource blocks that are not allocated in the state in the resource pre-allocation map of each cell and obtained by updating when the termination condition is met to be common resources, update the state to be allocated, and send the updated resource pre-allocation map of each cell to the corresponding cell.
An embodiment of the present invention further provides a cell in an LTE system, where the cell is a cell in a cooperation area, and as shown in fig. 7, the cell includes:
a receiving module 710, configured to receive a resource pre-allocation map of a local cell;
a scheduling module 720, configured to perform resource scheduling according to the resource allocation condition of the resource pre-allocation map; the resource scheduling comprises: and scheduling CoMP users by using the CoMP UE resources distributed in the resource pre-distribution graph, not scheduling backup resources distributed in the resource pre-distribution graph, and scheduling non-CoMP users by using the residual resources in the resource pre-distribution graph.
In summary, the device of the present invention can solve the problem of inter-cell cooperation and interference coordination for CoMP users more effectively, and achieve the effect of improving frequency efficiency and cell throughput. The invention can continuously and iteratively update the resource pre-allocation map on the basis of the resource pre-allocation map every time, gradually approaches the optimal resource pre-allocation effect, namely occupies as few backup resources as possible and serves more CoMP users. The invention can occupy the backup resources as little as possible and improve the resource utilization rate of the system under the condition of meeting the throughput requirement of the CoMP user.
All the embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. Especially for the device embodiment, because it is basically similar to the method embodiment, the description is simple, and the relevant points can be referred to the partial description of the method embodiment.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
In short, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (18)
1. A method for inter-cell cooperation in an LTE system, comprising:
step 1, acquiring a resource pre-allocation map of each cell in a cooperation area; the resource pre-allocation map identifies the property and state of each resource block of a cell, and the property of the resource block comprises: coordinated multipoint (CoMP) UE resources, common resources and backup resources; the states of the resource blocks are all marked as unallocated;
step 2, selecting a CoMP user from the CoMP users, and determining a resource block which can be used by the CoMP user according to a resource pre-allocation map of a service cell of the CoMP user;
step 3, according to the property and the state of the resource block of the coordinated cell of the CoMP user, determining the interference level of each usable resource block by the resource block of the coordinated cell and determining the coordination cost generated by selecting each usable resource block, and selecting the resource block with low interference level and low coordination cost as the resource block to be occupied by the CoMP user from each usable resource block;
step 4, updating the property of the selected resource block in the resource pre-allocation map of the service cell to CoMP UE resource and the state to allocated resource, and updating the property of the resource block which can be used in the resource pre-allocation map of each cooperative cell and is the same as the selected resource block to backup resource and the state to allocated resource;
step 5, selecting the next CoMP user from the CoMP users, and returning to the step 2 based on the currently updated resource pre-allocation map of each cell until the set termination condition is met;
and 6, issuing the updated resource pre-distribution map of each cell to the corresponding cell when the termination condition is met, and performing cooperation control on each cell.
2. The method of claim 1, wherein the obtaining the resource pre-allocation map for each cell in the cooperation area comprises:
detecting whether each cell has a resource pre-allocation map of a previous period, if so, acquiring the resource pre-allocation map of the cell of the previous period, and if not, establishing an initial resource pre-allocation map for the cell; and the property of each resource block in the initial resource pre-allocation map is marked as a common resource.
3. The method of claim 1, wherein the determining the resource blocks usable by the CoMP user according to the resource pre-allocation map of the serving cell comprises: and determining all resource blocks in the resource pre-allocation map of the serving cell to be unallocated as resource blocks which can be used by the CoMP user.
4. The method according to claim 1, wherein the selecting the resource block with low interference level and low coordination cost as the resource block to be occupied by the CoMP user from the available resource blocks specifically comprises:
based on the interference level of each usable resource block by the resource block of the coordinated cell and the coordination cost generated by selecting each usable resource block, performing priority ranking on each usable resource block according to a set ranking strategy;
and according to the priority order, selecting the resource blocks to be occupied by the CoMP user from the available resource blocks.
5. The method of any one of claims 1 to 4, wherein the determining the interference level of each usable resource block by a resource block of a cooperative cell comprises:
determining the property and the state of each resource block which is the same as each usable resource block in each cooperative cell aiming at each usable resource block in the serving cell;
calculating the power and the value of interference signals of each distributed cooperative cell, wherein the property of the determined resource block of a CoMP user is CoMP UE resource, and the state of the determined resource block is the CoMP UE resource, so as to obtain the interference level of the usable resource block interfered by each cooperative cell;
and/or, the determining the coordination cost generated by selecting each usable resource block comprises:
aiming at each usable resource block in a service cell, according to the principle that the common resource assignment which is not distributed is alpha, the backup resource which is not distributed is less than alpha, the CoMP UE resource which is not distributed is more than alpha, and the distributed resource assignment is a set standard value, the resource block which is the same as the usable resource block in each cooperative cell is assigned, the sum of the assignment of the resource block of each cooperative cell is obtained, and the coordination cost of the usable resource block is obtained; and the assignment values of the unallocated common resources, the unallocated backup resources and the CoMP UE resources are all larger than the standard values.
6. The method of claim 5,
the determined interference level of each usable resource block to the resource block of the cooperative cell is as follows:
n is the number of the cooperative cells;I（k）the power of an interference signal of a coordinated cell k received by the selected CoMP user;
the determined coordination cost generated by selecting each usable resource block is as follows:
if the resource block in the k-th coordinated cell of the selected CoMP user, which is the same as the usable resource block m, is allocated, the resource block m is allocatedMchange（k）Taking a set standard value;
if the resource block which is the same as the usable resource block m in the k-th coordinated cell of the selected CoMP user is not allocated, then:
when the property of the resource block is a common resource, thenMchange（k）Taking alpha;
when the resource block is a backup resource, thenMchange（k）Getγ(ii) a Wherein the content of the first and second substances,γless than alpha;
when the resource block is CoMP UE resource, thenMchange（k）Getu(ii) a Wherein, the first and the second end of the pipe are connected with each other,ugreater than alpha.
7. The method according to any one of claims 1 to 4 and 6, wherein the selecting, from the available resource blocks, a resource block with a low interference level and a small coordination cost as a resource block to be occupied by the CoMP user specifically comprises:
judging whether the number of the resource blocks required by the CoMP user reaches the upper limit of the total number of the CoMP UE resources of the service cell, if so, determining the number of the current residual CoMP UE resources as the number of the resources used by the CoMP user; otherwise, determining the number of the resource blocks required by the CoMP user as the number of the resources used by the CoMP user;
and according to the determined number of the resources, selecting the resource block with low interference level and low coordination cost as the resource block to be occupied by the CoMP user from all the available resource blocks.
8. The method of claim 1, wherein the set termination condition comprises: the resource number of the CoMP users of each cell in the cooperation area reaches the upper limit or the CoMP users are pre-allocated with resources.
9. The method according to any one of claims 1 to 4, 6 and 8, wherein the step 6 specifically comprises: and updating the properties of all resource blocks which are not distributed in the state in the resource pre-distribution graph of each cell and are obtained by updating when the termination condition is reached into common resources, updating the states into distributed resources, and issuing the updated resource pre-distribution graph of each cell to the corresponding cell.
10. An apparatus for inter-cell cooperation in an LTE system, comprising:
an obtaining module, configured to obtain a resource pre-allocation map of each cell in a cooperation area; the resource pre-allocation map identifies the property and state of each resource block of a cell, and the property of the resource block comprises: coMP UE resources, common resources, and backup resources; the states of the resource blocks are all marked as unallocated;
the available resource determining module is used for selecting a CoMP user from the CoMP users and determining a resource block which can be used by the CoMP user according to a resource pre-allocation map of a service cell of the CoMP user;
the resource selection module is used for determining the interference level of each usable resource block by the resource block of the coordinated cell and determining the coordination cost generated by selecting each usable resource block according to the property and the state of the resource block of the coordinated cell of the CoMP user, and selecting the resource block with low interference level and low coordination cost from each usable resource block as the resource block to be occupied by the CoMP user;
an updating module, configured to update the property of the selected resource block in the resource pre-allocation map of the serving cell to be a CoMP UE resource and update the status to be allocated, and update the property of the resource block, which is available in the resource pre-allocation map of each cooperating cell and is the same as the selected resource block, to be a backup resource and update the status to be allocated;
the iteration module is used for selecting the next CoMP user from the CoMP users and triggering the available resource determination module based on the currently updated resource pre-allocation map of each cell until the set termination condition is met;
and the cooperation control module is used for issuing the updated resource pre-allocation map of each cell to the corresponding cell when the termination condition is met, and performing cooperation control on each cell.
11. The apparatus of claim 10, wherein the obtaining module is specifically configured to detect whether each cell has a resource pre-allocation map of a previous cycle, and if so, obtain the resource pre-allocation map of the cell of the previous cycle, and if not, create an initial resource pre-allocation map for the cell; and the property of each resource block in the initial resource pre-allocation map is marked as a common resource.
12. The apparatus of claim 10, wherein the available resource determining module is specifically configured to determine that all resource blocks in the resource pre-allocation map of the serving cell of the selected CoMP user are available to the CoMP user, where the resource blocks are unallocated.
13. The apparatus of claim 10, wherein the resource selection module further comprises:
the sequencing submodule is used for carrying out priority sequencing on each usable resource block according to a set sequencing strategy based on the interference level of each usable resource block by the resource block of the cooperative cell and the coordination cost generated by selecting each usable resource block;
and the resource block selection submodule is used for selecting the resource blocks to be occupied by the CoMP user from the usable resource blocks according to the priority order.
14. The apparatus according to any one of claims 10 to 13, wherein the resource selection module specifically includes:
the interference level calculation submodule is used for determining the property and the state of each resource block which is the same as each available resource block in each cooperative cell aiming at each available resource block in the serving cell; calculating the power and the value of the interference signal of each allocated cooperative cell, wherein the property of the determined resource block of the CoMP user is CoMP UE resource, and the state of the determined resource block is the allocated interference signal of each cooperative cell, and obtaining the interference level of the usable resource block interfered by each cooperative cell;
a coordination cost calculation sub-module, configured to assign, for each available resource block in a serving cell, the resource block in each cooperating cell that is the same as the available resource block according to a rule that an unassigned common resource is assigned to α, an unassigned backup resource is assigned to less than α, an unassigned CoMP UE resource is assigned to greater than α, and an assigned resource is assigned to a set standard value, to obtain a sum of the resource block assignments of the cooperating cells, so as to obtain a coordination cost of the available resource block; and the assignment values of the unallocated common resources, the unallocated backup resources and the CoMP UE resources are all larger than the standard values.
15. The apparatus according to claim 14, wherein the interference level of each resource block available for use by the interference level calculation sub-module to each resource block of the cooperative cell is:
n is the number of the cooperative cells;I（k）the power of an interference signal of a coordinated cell k received by the selected CoMP user;
the coordination cost generated by selecting each usable resource block obtained by the coordination cost calculation submodule is as follows:
；
if the resource block in the k-th coordinated cell of the selected CoMP user, which is the same as the usable resource block m, is allocated, the resource block m is allocatedMchange（k）Taking a set standard value;
if the resource block which is the same as the usable resource block m in the k-th coordinated cell of the selected CoMP user is not allocated, then:
when the property of the resource block is a common resource, thenMchange（k）Taking alpha;
when the resource block is a backup resource, thenMchange（k）Getγ(ii) a Wherein the content of the first and second substances,γless than alpha;
when the resource block is CoMP UE resource, thenMchange（k）Getu(ii) a Wherein the content of the first and second substances,uis greater than alpha.
16. The apparatus according to any one of claims 10 to 13 and 15, wherein the resource selection module is specifically configured to determine whether the number of resource blocks required by the CoMP user reaches an upper limit of a total number of CoMP UE resources of a serving cell of the CoMP user, and if so, determine that the number of the remaining CoMP UE resources is the number of resources used by the CoMP user; otherwise, determining the number of the resource blocks required by the CoMP user as the number of the resources used by the CoMP user; and according to the determined number of the resources, selecting the resource block with low interference level and low coordination cost as the resource block to be occupied by the CoMP user from all the available resource blocks.
17. The apparatus of claim 10, wherein the termination condition set in the iteration module comprises: the resource number of the CoMP users of each cell in the cooperation area reaches the upper limit or the CoMP users are pre-allocated with resources.
18. The apparatus according to any one of claims 10 to 13, 15, and 17, wherein the cooperation control module is specifically configured to update the properties of all resource blocks that are in an unallocated state in the resource pre-allocation map of each cell, which is updated when a termination condition is reached, to be a common resource, update the states to be allocated, and send the updated resource pre-allocation map of each cell to the corresponding cell.
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