CN107787045B - Inter-cell interference coordination method and system - Google Patents
Inter-cell interference coordination method and system Download PDFInfo
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- CN107787045B CN107787045B CN201610786702.6A CN201610786702A CN107787045B CN 107787045 B CN107787045 B CN 107787045B CN 201610786702 A CN201610786702 A CN 201610786702A CN 107787045 B CN107787045 B CN 107787045B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
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- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/005—Interference mitigation or co-ordination of intercell interference
Abstract
The invention discloses a method and a system for coordinating interference between cells, and relates to the field of mobile communication. The method comprises the following steps: the first mobile terminal sends the physical resource block occupation information of the uplink to the second mobile terminal through the mobile self-organizing network; the first mobile terminal is a mobile terminal located at the edge of a first cell adjacent to a second cell, the second mobile terminal is a mobile terminal located in the second cell, and the mobile ad hoc network comprises the first mobile terminal and the second mobile terminal; and the second mobile terminal sends the physical resource block occupation information of the uplink of the first mobile terminal to the second cell base station, so that the second cell base station allocates the physical resource blocks which are not occupied by the mobile terminals at the edge of the adjacent first cell to the mobile terminals at the edge of the second cell adjacent to the first cell. Thereby reducing the co-channel interference between cells.
Description
Technical Field
The present invention relates to the field of mobile communications technologies, and in particular, to a method and a system for coordinating inter-cell interference.
Background
When LTE is in a same-frequency networking mode, same-frequency interference can be generated between adjacent cells, and the main technology for resisting the same-frequency interference of the existing LTE system is an inter-cell interference coordination (ICIC) technology.
In the 3GPP standard, the uplink employs a dynamic ICIC technique, and transmits information of high interference indication HII and overload indication OI through an X2 interface. The HII is used for indicating physical resource blocks PRB allocated to edge users and possibly causing large interference, and collision is avoided and interference is reduced through resource scheduling. OI is used to indicate those PRBs that have been subjected to greater interference, preventing them from being re-allocated to edge users. When the result obtained by the algorithm adopted by the network equipment is greater than the set HII threshold, the PRB is marked as the HII and is transmitted to the adjacent cells, and different adjacent cells can transmit different HIIs. When the uplink interference exceeds the trigger threshold, the cell sends OI to the neighboring cell to indicate the uplink interference condition inside the cell. The downlink adopts the relative narrow-band transmitting power RNTP parameter to indicate the power information of each PRB, the power information of the PRB of the cell can be informed to the adjacent cell in advance by transmitting the RNTP parameter, and the adjacent cell carries out interference coordination according to the received power information, thereby reducing the inter-cell interference. In the standard, only 1bit is used by RNTP to indicate whether a certain PRB is occupied, and R8 supports the interaction of RNTP information among base stations. For both uplink and downlink, PRB resources are scheduled by the base station.
ICIC is classified into 4 general categories according to the frequency of updating the restriction on the use of radio resources:
static coordination: the time for reconfiguring the use limit of the wireless resources is several days, and information exchange between the base stations is hardly needed.
Semi-static state: the time for reconfiguring the use restriction of the radio resource is on the order of seconds or more, and the frequency of information transfer between the base stations is on the order of tens of seconds or minutes.
Dynamic coordination: the time for reconfiguring the use restriction of the radio resource is several tens or several hundreds of milliseconds, and the frequency of information transfer between the base stations is similar.
And (3) cooperative scheduling: the time for reconfiguring the use limit of the radio resource is in the TTI millisecond level, and information cannot be transferred between the base stations due to the delay limit of the X2 interface.
During the two reconfiguration intervals, some PRBs which are not originally possible to generate interference HII marks in the future may exceed an HII threshold, but are not marked as HII before reconfiguration and are sent to a neighboring cell base station, and if the neighboring cell base station allocates the PRBs to edge users for use, the inter-cell interference is caused; and some PRBs marked as HII may be lower than the HII threshold, and the PRBs cannot be allocated to edge users by adjacent cells before reconfiguration, which causes waste of resources. Similarly, during two reconfiguration intervals, some PRBs that are not marked as having experienced past interference OI may exceed the OI threshold but will not be marked as OI before reconfiguration and sent to the neighboring cell, which may allocate these PRBs to edge users, resulting in edge users using these PRBs experiencing inter-cell interference, while some PRBs that are marked as OI may have fallen below the OI threshold but will not be marked with OI before reconfiguration and sent to the neighboring cell base station, which will not be allocated to edge users by the neighboring cell base station, resulting in a waste of resources.
Shortening the two reconfiguration intervals, such as semi-static coordination or dynamic coordination, may reduce inter-cell interference and resource waste, but may increase the load on the X2 interface. In addition, by adopting semi-static coordination or dynamic coordination, a reliable prediction mode is required during network planning, and meanwhile, the problems of difficult coordination and the like caused by different ICIC algorithms adopted by different manufacturers need to be considered. Therefore, in the absence of a reliable prediction mode, it is difficult to achieve good results by using semi-static coordination or dynamic coordination.
Disclosure of Invention
The invention aims to solve the technical problems that: how to mitigate co-channel interference between cells.
According to an aspect of the embodiments of the present invention, there is provided a method for coordinating inter-cell interference, including: the first mobile terminal sends the physical resource block occupation information of the uplink to the second mobile terminal through the mobile self-organizing network; the first mobile terminal is a mobile terminal located at the edge of a first cell adjacent to a second cell, the second mobile terminal is a mobile terminal located in the second cell, and the mobile ad hoc network comprises the first mobile terminal and the second mobile terminal; and the second mobile terminal sends the physical resource block occupation information of the uplink of the first mobile terminal to the second cell base station, so that the second cell base station allocates the physical resource blocks which are not occupied by the mobile terminals at the edge of the adjacent first cell to the mobile terminals at the edge of the second cell adjacent to the first cell.
According to another aspect of the embodiments of the present invention, there is provided an inter-cell interference coordination system, including a first mobile terminal, a second mobile terminal, and a second cell base station, where the first mobile terminal is configured to send physical resource block occupancy information of an uplink to the second mobile terminal through a mobile ad hoc network; the first mobile terminal is a mobile terminal located at the edge of a first cell adjacent to a second cell, the second mobile terminal is a mobile terminal located in the second cell, and the mobile ad hoc network comprises the first mobile terminal and the second mobile terminal; the second mobile terminal is used for sending the physical resource block occupation information of the uplink of the first mobile terminal to the second cell base station; the second cell base station is used for allocating physical resource blocks which are not occupied by the mobile terminals at the edge of the adjacent first cell to the mobile terminals at the edge of the second cell adjacent to the first cell.
According to the invention, the first mobile terminal sends the physical resource block occupation information of the uplink to the second mobile terminal through the mobile self-organizing network, and the second mobile terminal sends the physical resource block occupation information of the uplink of the first mobile terminal to the second cell base station, so that the second cell base station can distribute the unoccupied physical resource block to the mobile terminal at the edge of the second cell adjacent to the first cell, thereby avoiding the physical resource block PRB used by the mobile terminal at the edge of the adjacent cell from being distributed to the mobile terminal at the edge of the cell for use, and reducing the same frequency interference among the cells.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
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 description of the embodiments or the prior art will be briefly described below, and 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 these drawings without creative efforts.
Fig. 1 is a flowchart illustrating an embodiment of an inter-cell interference coordination method according to the present invention.
Fig. 2 is a flowchart illustrating an inter-cell interference coordination method according to another embodiment of the present invention.
Fig. 3 shows a schematic diagram of the clustering of a mobile ad hoc network.
Fig. 4 is a schematic structural diagram illustrating an embodiment of a system for inter-cell interference coordination 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. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. 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.
The following describes an inter-cell interference coordination method according to an embodiment of the present invention with reference to fig. 1.
Fig. 1 is a flowchart illustrating an embodiment of an inter-cell interference coordination method according to the present invention. As shown in fig. 1, the inter-cell interference coordination method in this embodiment includes the following steps:
step S103, the first mobile terminal sends the physical resource block occupation information of the uplink to the second mobile terminal through the mobile ad hoc network. The first mobile terminal is a mobile terminal located at the edge of a first cell adjacent to a second cell, the second mobile terminal is a mobile terminal located in the second cell, and the mobile ad hoc network comprises the first mobile terminal and the second mobile terminal.
For example, a cell is adjacent to a cell B, and the mobile ad hoc network includes mobile terminals of the cell a and mobile terminals of the cell B. The mobile terminal located at the edge of the a cell adjacent to the B cell may send the physical resource block occupancy information of the uplink to the mobile terminal located in the B cell through the mobile ad hoc network.
Step S104, the second mobile terminal sends the PRB occupation information of the uplink physical resource block of the first mobile terminal to the second cell base station, so that the second cell base station allocates the physical resource block which is not occupied by the mobile terminal at the edge of the adjacent first cell to the mobile terminal at the edge of the second cell adjacent to the first cell.
For example, the mobile terminal of the B-cell may transmit the physical resource block PRB occupancy information of the uplink of the a-cell mobile terminal to the base station of the B-cell, so that the base station of the B-cell allocates the physical resource block not occupied by the mobile terminal of the neighboring first cell edge to the mobile terminal of the B-cell edge neighboring the a-cell.
Through the embodiment, the mobile terminals transmit the PRB information used by the uplink of the mobile terminal to the mobile terminals of the adjacent cells through the mobile ad hoc network, and the mobile terminals of the adjacent cells report the PRB information to the cell base stations registered by the mobile terminals of the adjacent cells. During the two reconfiguration intervals, PRBs which are already used by the edge mobile terminals of the adjacent cells are prevented from being allocated to the edge mobile terminals of the cell to be used, and the inter-cell co-channel interference is reduced. Meanwhile, the terminal sends the PRB occupation information through the self-organizing network, so that the load of the base station can be reduced. In addition, the embodiment does not need a prediction mode, makes up for the lack of dependence on the prediction mode in the prior art, and simplifies network planning.
A method for inter-cell interference coordination according to another embodiment of the present invention is described below with reference to fig. 2.
Fig. 2 is a flowchart illustrating an inter-cell interference coordination method according to another embodiment of the present invention. As shown in fig. 2, based on the embodiment of fig. 1, the inter-cell interference coordination method in this embodiment further includes:
step S100, if the first mobile terminal does not join any mobile ad hoc network, starting mobile ad hoc network search.
Step S101, the first mobile terminal judges whether a mobile self-organizing network is searched.
If the mobile ad hoc network is searched, executing step S102a, and the first mobile terminal joining the searched mobile ad hoc network; if the mobile ad hoc network is not searched, step S102b is executed, and the first mobile terminal establishes the mobile ad hoc network.
The more users at the edge of a cell, the more convenient the establishment of a mobile ad hoc network is, the more flexible the physical resource block allocation is, and the more remarkable the effect of interference coordination among cells is.
A mobile ad hoc network established between mobile terminals is grouped according to cells registered by the mobile terminals, and each group selects a group head according to a group head selection rule, for example, as shown in fig. 3. After the mobile terminal in the mobile ad hoc network is reconfigured at the cell base station, the grouped head terminal of the mobile ad hoc network in the second cell may be selected as the second mobile terminal, that is, the head terminal in the B-cell B group.
The cluster head terminal sends the PRB information of the edge of the adjacent cell to the base station, so that the repeated sending of the PRB information can be avoided, and the system efficiency is improved.
Optionally, in step S103, the mobile terminal located at the edge of the a cell adjacent to the B cell may send the physical resource block occupancy information of the uplink to the cluster head terminal of the B cell cluster through the mobile ad hoc network. And the mobile terminal at the cluster head locally establishes and maintains a PRB list of the adjacent cell, and the initial PRB list is empty. During the two reconfiguration intervals, the cluster first stores the received PRB information from the mobile terminals of the adjacent cells in a PRB list and reports the list to the base station of the cell in which the cluster is located. When the base station reconfigures the physical resource block, the mobile terminal at the head of the group initializes the PRB list.
Optionally, in step S104, the cell base station may establish and maintain a PRB occupation list of the neighboring cell, and after receiving the first PRB information reported by the group after reconfiguration, mark the PRB in the corresponding cell in the list as occupied, indicate that the PRB is already occupied by the edge user of the neighboring cell, and avoid allocating the PRB to the cell and the edge user occupying the neighboring PRB.
When the grouped cluster head terminal of the mobile self-organizing network in the second cell is changed from the original cluster head terminal to a new cluster head terminal, the original cluster head terminal sends the physical resource block occupation information of the uplink of the first mobile terminal to the new cluster head terminal. For example, the original cluster head terminal may forward the PRB list to the new cluster head terminal, and the new cluster head terminal takes over the storage and forwarding task of the physical resource block information by the original cluster head terminal, thereby ensuring normal operation of cell interference coordination.
The mobile terminal sends the PRB information to the cluster head of the adjacent cell cluster only when the mobile terminal is positioned at the edge of the cell, and the edge is defined when the cell base station plans. When the cluster head is located at the edge, the PRB information also needs to be sent to the cluster head of the adjacent cell cluster, and when the cluster head is not located at the edge, the PRB information does not need to be sent to the cluster head of the adjacent cell cluster.
If a mobile terminal which has been allocated with PRB enters the central area of the same cell from the edge area of the cell, it needs to send PRB change message to the cluster head of the adjacent cell cluster at the edge of the cell where the mobile terminal before entering, and the cluster head of the adjacent cell cluster marks the PRB as unoccupied.
If a mobile terminal enters the edge of another adjacent cell from the edge of one cell and switches the registered cell, the mobile terminal changes the cluster to which the mobile terminal belongs and joins the cluster of the currently registered cell. When a mobile terminal changes grouping and is located at the edge of a cell, the PRB information distributed by the base station of the current registered cell needs to be sent to the group head of the adjacent cell grouping, and the PRB change information is sent to the group head of the adjacent cell grouping of the previous registered cell. After the base station reconfigures the physical resources, the PRBs that have been marked as occupied will set their state according to the planned reconfiguration.
The established mobile self-organizing network covers the edge of a cell, if the mobile self-organizing network covers the edges of a plurality of adjacent cells at the same time, the mobile self-organizing network is divided into a plurality of groups, one adjacent cell is a group, and mobile terminals of the same cell belong to the same group. A plurality of mobile ad hoc networks may exist at the same time at one cell edge, each mobile ad hoc network has a group and a group head, and each group head independently sends a PRB list to a cell base station. The mobile ad hoc network at the edge of a cell may also be split into a plurality of mobile ad hoc networks, each mobile ad hoc network after the split has a respective group and a group head, and each group head independently sends a PRB list to the cell base station. It is also possible that a plurality of mobile ad hoc networks at the edge of one cell are combined into one mobile ad hoc network, and the combined mobile ad hoc network has only one group and a group head in each neighboring cell.
Optionally, in step S104, the second mobile terminal periodically sends the physical resource block occupancy information of the uplink of the first mobile terminal to the second cell base station.
The mobile terminal at the head of the group periodically transmits the PRB information used by the mobile terminal in the edge area of the adjacent cell in the same period during the period of the base station reconfiguring the physical resource, and the transmission period can be set and adaptively adjusted according to the time interval of the base station reconfiguring the physical resource, the interference condition between the cells and the load of the base station, so as to further reduce the load of the base station of the cell.
Optionally, in step S103, the first mobile terminal sends the changed physical resource block occupancy information of the uplink to the second mobile terminal through the mobile ad hoc network. For example, the period for reconfiguring the physical resource block by the base station may be long or short, and the longer the period, the lower the load of the X2 interface of the cell base station in the system performance range. During the period of the base station reconfiguring the physical resource block interval twice, if the PRB allocated by the base station of the A cell is changed, the mobile terminal positioned at the edge of the A cell can send the changed PRB information to the cluster head of the B cell cluster. Accordingly, in step S104, the second mobile terminal transmits the changed physical resource block occupancy information of the uplink of the first mobile terminal to the second cell base station. For example, when receiving the PRB change information, the head terminal of the B-cell group changes the PRB list and transmits it to the cell base station in a set period.
The terminal at the edge of the cell A and the group of the cell B firstly transmit all the PRB information, then only transmit the changed PRB information, and do not transmit the unchanged PRB information, thereby reducing the load of the related terminal and the base station under the condition of reducing the co-channel interference between the cells. When the PRB change information is sent, the PRB information which is occupied once but not occupied any more is included so as to increase the physical resource blocks which can be preferentially selected.
In addition, the invention can be combined with the existing cell interference coordination technology. In the prior art, a cell base station allocates PRBs without HII and OI marks to a cell edge mobile terminal according to HII and OI marks. In the technology, the cell base station occupies PRB information, HII and OI marks according to the current adjacent cell, and the priority sequence for allocating PRBs is as follows: the method has no HII, no OI and no occupation mark, has HII and no occupation mark, and has OI and no occupation mark, thereby expanding the available PRB resources and improving the spectrum utilization rate. During the interval of two reconfigurations, the occupation information of PRBs at the edge of the adjacent cell is provided in time, the possibility that the same PRB is used by users at the edge of the adjacent cell at the same time is reduced, the interference among the cells is reduced, the number of OIs in the next reconfiguration is reduced, and the system efficiency is improved.
A cell interference coordination system according to an embodiment of the present invention is described below with reference to fig. 4.
Fig. 4 is a schematic structural diagram illustrating an embodiment of a cell interference coordination system according to the present invention. As shown in fig. 4, the cell interference coordination system 40 in this embodiment includes: a first mobile terminal 401, a second mobile terminal 402, and a second cell base station 403, wherein,
the first mobile terminal 401 is configured to send physical resource block occupancy information of an uplink to the second mobile terminal 402 through the mobile ad hoc network; the first mobile terminal 401 is a mobile terminal located at an edge of a first cell adjacent to a second cell, the second mobile terminal 402 is a mobile terminal located in the second cell, and the mobile ad hoc network includes the first mobile terminal 401 and the second mobile terminal 402.
The second mobile terminal 402 is configured to send the physical resource block occupancy information of the uplink of the first mobile terminal 401 to the second cell base station.
The second cell base station 403 is arranged to allocate unoccupied physical resource blocks to mobile terminals at the edge of a second cell adjacent to the first cell.
Through the embodiment, the mobile terminals transmit the PRB information used by the uplink of the mobile terminal to the mobile terminals of the adjacent cells through the mobile ad hoc network, and the mobile terminals of the adjacent cells report the PRB information to the cell base stations registered by the mobile terminals of the adjacent cells. During the two reconfiguration intervals, PRBs which are already used by the edge mobile terminals of the adjacent cells are prevented from being allocated to the edge mobile terminals of the cell to be used, and the inter-cell co-channel interference is reduced. Meanwhile, the terminal sends the PRB occupation information through the self-organizing network, so that the load of the base station can be reduced. In addition, the embodiment does not need a prediction mode, makes up for the lack of dependence on the prediction mode in the prior art, and simplifies network planning.
Optionally, the second mobile terminal 402 is a clustered head of group terminal of the mobile ad hoc network in the second cell.
The cluster head terminal sends the PRB information of the edge of the adjacent cell to the base station, so that the repeated sending of the PRB information can be avoided, and the system efficiency is improved.
Optionally, when the grouped cluster head terminal of the mobile ad hoc network in the second cell is changed from the original cluster head terminal to a new cluster head terminal, the original cluster head terminal sends the physical resource block occupation information of the uplink of the first mobile terminal to the new cluster head terminal, so as to ensure normal operation of cell interference coordination.
Optionally, the first mobile terminal 401 is configured to send the changed uplink physical resource block occupancy information to the second mobile terminal 402 through the mobile ad hoc network. The second mobile terminal 402 is configured to send the changed physical resource block occupancy information of the uplink of the first mobile terminal 401 to the second cell base station.
And only the changed PRB information is transmitted, and the unchanged PRB information is not transmitted, so that the loads of the related terminal and the base station can be reduced under the condition of reducing the inter-cell co-channel interference. When the PRB change information is sent, the PRB information which is occupied once but not occupied any more is included so as to increase the physical resource blocks which can be preferentially selected.
Optionally, the first mobile terminal 401 is further configured to: if the first mobile terminal 401 does not join any ad hoc network, a mobile ad hoc network search is initiated. If the mobile ad hoc network is searched, adding the searched mobile ad hoc network; and if the mobile ad hoc network is not searched, establishing the mobile ad hoc network.
The more users at the edge of a cell, the more convenient the establishment of a mobile ad hoc network is, the more flexible the physical resource allocation is, and the more remarkable the effect of interference coordination among cells is.
Optionally, the second mobile terminal 402 is configured to periodically send the physical resource block occupancy information of the uplink of the first mobile terminal 401 to the second cell base station.
The mobile terminal at the head of the group periodically transmits the PRB information used by the mobile terminals of the adjacent cell in the same period during the period of the base station reconfiguring the physical resource, and the transmission period can be set and adaptively adjusted according to the time interval of the base station reconfiguring the physical resource, the interference condition between the cells and the load of the base station, so as to further reduce the load of the base station of the cell.
It will be understood by those skilled in the art that all or part of the steps of implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method of inter-cell interference coordination, comprising:
the first mobile terminal sends the physical resource block occupation information of the uplink to the second mobile terminal through the mobile self-organizing network; the first mobile terminal is a mobile terminal located at the edge of a first cell adjacent to a second cell, the second mobile terminal is a mobile terminal located in the second cell, the second mobile terminal is a cluster head terminal of a mobile ad hoc network in the second cell, and the mobile ad hoc network comprises the first mobile terminal and the second mobile terminal;
and the second mobile terminal sends the physical resource block occupation information of the uplink of the first mobile terminal to the second cell base station, so that the second cell base station allocates the physical resource blocks which are not occupied by the mobile terminals at the edge of the adjacent first cell to the mobile terminals at the edge of the second cell adjacent to the first cell.
2. The method of claim 1, wherein the method further comprises:
when the grouped cluster head terminal of the mobile self-organizing network in the second cell is changed from the original cluster head terminal to a new cluster head terminal, the original cluster head terminal sends the physical resource block occupation information of the uplink of the first mobile terminal to the new cluster head terminal.
3. The method of claim 1,
the first mobile terminal sends the changed physical resource block occupation information of the uplink to a second mobile terminal through a mobile self-organizing network;
and the second mobile terminal sends the changed physical resource block occupation information of the uplink of the first mobile terminal to the second cell base station.
4. The method of claim 1, wherein the method further comprises:
if the first mobile terminal does not join any mobile self-organizing network, starting mobile self-organizing network search;
if the mobile ad hoc network is searched, adding the searched mobile ad hoc network; and if the mobile ad hoc network is not searched, establishing the mobile ad hoc network.
5. The method of claim 1, wherein the second mobile terminal periodically sends physical resource block occupancy information for the uplink of the first mobile terminal to the second cell base station.
6. An inter-cell interference coordination system comprises a first mobile terminal, a second mobile terminal and a second cell base station, wherein,
the first mobile terminal is used for sending the physical resource block occupation information of the uplink to the second mobile terminal through the mobile self-organizing network; the first mobile terminal is a mobile terminal located at the edge of a first cell adjacent to a second cell, the second mobile terminal is a mobile terminal located in the second cell, the second mobile terminal is a cluster head terminal of a mobile ad hoc network in the second cell, and the mobile ad hoc network comprises the first mobile terminal and the second mobile terminal;
the second mobile terminal is used for sending the physical resource block occupation information of the uplink of the first mobile terminal to the second cell base station;
the second cell base station is used for allocating physical resource blocks which are not occupied by the mobile terminals at the edge of the adjacent first cell to the mobile terminals at the edge of the second cell adjacent to the first cell.
7. The system of claim 6, wherein the mobile ad hoc network transmits physical resource block occupancy information of the uplink of the first mobile terminal to the new head of group terminal when the grouped head of group terminal in the second cell is changed from the old head of group terminal to the new head of group terminal.
8. The system of claim 6,
the first mobile terminal is used for sending the changed physical resource block occupation information of the uplink to the second mobile terminal through the mobile self-organizing network;
and the second mobile terminal is used for sending the changed physical resource block occupation information of the uplink of the first mobile terminal to the second cell base station.
9. The system of claim 6, wherein the first mobile terminal is further configured to:
if the first mobile terminal does not join any mobile self-organizing network, starting mobile self-organizing network search;
if the mobile ad hoc network is searched, adding the searched mobile ad hoc network; and if the mobile ad hoc network is not searched, establishing the mobile ad hoc network.
10. The system of claim 6, wherein the second mobile terminal is configured to periodically send physical resource block occupancy information for the uplink of the first mobile terminal to the second cell base station.
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