CN103648100A - Method and device for coordinating interferences among cells based on TD-LTE (TD-SCDMA Long Term Evolution) trucked communication system - Google Patents
Method and device for coordinating interferences among cells based on TD-LTE (TD-SCDMA Long Term Evolution) trucked communication system Download PDFInfo
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Abstract
The invention discloses a method and a device for coordinating interferences among cells based on a TD-LTE (TD-SCDMA Long Term Evolution) trucked communication system, and relates to mobile communication technologies. The total frequency resources are divided into cell marginal frequency resources and cell center frequency resources according to a division threshold, when a terminal user belongs to a marginal area, the service data rate of central area users whose priority level is lower than a priority threshold is reduced gradually, and resources of the central area users are provided for marginal area users until a service rate requirement thereof is satisfied; and when the terminal user belongs to a central area, the service data rate of other central area users whose priority level is lower than the priority threshold, and resources of the other central area users are provided for central area users of high-priority level services until a service rate requirement of the central area users of the high-priority level services is satisfied. The method and the device effectively ensure the service quality of the high-priority services, improve the marginal user handling capacity, and suppress interferences among the cells.
Description
Technical field
The present invention relates to wireless communication field, particularly a kind of method and apparatus of the Inter-Cell Interference Coordination based on TD-LTE (TD-SCDMA Long Term Evolution, the Long Term Evolution of TD-SCDMA) trunked communication system.
Background technology
The private wireless communication system that trunked communication system is developed in order to meet industry user's command scheduling demand, applied towards specific industry, in system, a large amount of wireless users share a small amount of wireless channel, take command scheduling as main body application, is a kind of multipurpose, dynamical wireless communication system.Trunked communication system, with half-duplex mode communication, passes through obtaining and discharging of PoC (Push To Talk, PTT or P2T) key control channel during work, channel utilization is high, and call proceeding is fast; In group, user shares down channel, and resource utilization is high.And trunked communication system can guarantee by voice encryption privacy and the fail safe of call; For high-priority users or business priority allocation channel; By fail soft function, guarantee the communication under the state of emergency; By dynamic restructuring, realize multi-level packet scheduling command function flexibly.
Trunked communication system based on TD-LTE is that TD-LTE technology and specific schedule communication system are combined, and adopts the communication system of half-duplex operation mode, can realize fast and continuing, and supports group call (being the method for calling of one-to-many).Such trunked communication system can extensive use and enterprises and institutions, public security and department of army etc. that commander, scheduling feature are had relatively high expectations.
TD-LTE system descending adopts OFDMA multiple access technology, intercarrier is mutually orthogonal, thereby has avoided disturbing in community, but owing to adopting same frequency resources to transmit between neighbor cell, presence of intercell interference just cannot be avoided, and the performance that is particularly positioned at Cell Edge User can be subject to very big loss.For improving Cell Edge User data rate, improve the overall performance of system, just must suppress presence of intercell interference.In 3GPP TR25.814, point out that the method that suppresses presence of intercell interference mainly contains three classes: presence of intercell interference randomization, inter-cell interference cancellation and Inter-Cell Interference Coordination/avoid.The statistical property that wherein presence of intercell interference randomization utilization is disturbed suppresses disturbing, and error is larger.Inter-cell interference cancellation technology can significantly be improved the systematic function of cell edge, obtain higher spectrum efficiency, but not too applicable for the less business of bandwidth (as VoIP), in OFDMA system, realize also more complicated, the follow-up research to it is few.Inter-Cell Interference Coordination/avoid is a hot technology of research at present, and it realizes simple, can be applied to the business of various bandwidth, and suppresses to have good effect for disturbing.The Inter-Cell Interference Coordination of LTE system/avoid technological core thought to be proportion multiplex technique, it makes the distance of interference source between neighbor cell far away as far as possible, thereby suppress the interference of neighbor cell, improve the signal to noise ratio of neighbor cell in these resources and data rate and the covering of cell edge.Soft-frequency reuse (Soft frequency reuse, SFR) is more typical inter-cell interference coordination method.SFR appears at GSM for the first time, be then used under the framework of 3GPP LTE [3GPP and Huawei, " Soft frequency reuse scheme for UTRAN LTE; " in R1-050507, TSG RAN WG1Meeting#41, Athens, Greece, 2005.].In SFR, all frequency ranges have been divided into two groups of subcarriers, and one group is called boss's carrier wave, and other one group is called auxiliary subcarrier.Boss's carrier wave can be in the use Anywhere of community, and auxiliary subcarrier can only be used at center of housing estate.Boss's carrier wave between different districts is mutually orthogonal, at cell edge, has effectively suppressed interference, and auxiliary subcarrier is owing to only being used at center of housing estate, disturbs each other littlely, can use identical frequency.Although SFR has suppressed presence of intercell interference, belong to static resource allocation mode, frequency resource cannot change according to the variation of center and peripheral area load.
Above-mentioned Inter-Cell Interference Coordination technology is based on TD-LTE system, and be static interference coordination, the division of frequency resource is static cannot changing according to the variation of load, in addition, the business of trunked communication system has the service quality of dividing and first will guarantee high-priority service of priority, above-mentioned Inter-Cell Interference Coordination technology is not suitable for TD-LTE trunked communication system, therefore proposes a kind of inter-cell interference coordination method based on TD-LTE trunked communication system.
Summary of the invention
The present invention is directed to above-mentioned technical problem, a kind of coordinating district interference algorithm based on TD-LTE trunked communication system is provided, mainly for the Inter-Cell Interference Coordination algorithm in TD-LTE system, lack the consideration to service priority, can not guarantee the problem of the service quality of high-priority service, be not suitable for trunked communication system, to meet the user's request that throughput of system performance especially edge customer is had to higher priority, better, for user serves particularly edge customer, improved the overall performance of system.
The technical scheme that the present invention solves the problems of the technologies described above is, design a kind of Inter-Cell Interference Coordination device based on TD-LTE trunked communication system, comprise: resource division module, user type judge module, service priority judge module, resource judgment module, resource are seized module and scheduling of resource and distribution module, resource division module is divided into cell edge frequency resource and center of housing estate frequency resource according to dividing threshold value by whole frequency resource; User type judge module belongs to central area or fringe region by user feedback pilot frequency information judgement user; Service priority judge module judgement user's service priority grade, compares with the threshold value of setting; The required frequency resource of resource judgment module judgement customer service; When user belongs to fringe region, resource is seized module, and by priority level, the central area user service data speed lower than priority threshold value reduces gradually, and its resource is used until meet its service rate requirement to fringe region user; When user belongs to central area, resource is seized module, and by priority level, other central area user service data speed lower than priority threshold value reduce gradually, and the central area user by these other central area user resources to high priority grade business uses until meet the central area customer service rate requirement of high priority grade business.
Resource division module is divided into mutually orthogonal three equal parts by whole frequency resource, and cell edge region user uses a copy of it, and center of housing estate region user can use whole frequency resource, and neighbor cell fringe region available frequency resources is mutually orthogonal.
The present invention also proposes a kind of inter-cell interference coordination method based on TD-LTE trunked communication system, and resource division module is divided into cell edge frequency resource and center of housing estate frequency resource according to dividing threshold value by whole frequency resource; User type judge module belongs to central area or fringe region by user feedback pilot frequency information judgement terminal use; Service priority judge module judgement user's service priority grade, compares with the priority threshold value of setting; The required frequency resource of resource judgment module judgement customer service; When terminal use belongs to fringe region, resource is seized module, and by priority level, the central area user service data speed lower than priority threshold value reduces gradually, and its resource is used until meet its service rate requirement to fringe region user; When terminal use belongs to central area, resource is seized module, and by priority level, other central area user service data speed lower than priority threshold value reduce gradually, and the central area user by these other central area user resources to high priority grade business uses until meet the central area customer service rate requirement of high priority grade business.Resource division module is divided into mutually orthogonal three equal parts by whole frequency resource, and cell edge region user uses a copy of it, and center of housing estate region user can use whole frequency resource, and neighbor cell fringe region available frequency resources is mutually orthogonal.When terminal use belongs to Cell Edge User, frequency resource allocation further comprises step: determine the required frequency resource of this Cell Edge User business, judge whether institute's edge region has enough available frequency resources, if have, directly carry out scheduling and the distribution of resource, if do not have, judging whether central area has can use frequency resource, if have, can use frequency resource, using central area frequency resource dispatches and distributes, if central area does not have to dispatch frequency resource, priority judge module judges whether this edge customer service priority grade is greater than set priority threshold value, as priority threshold value as described in being greater than, this edge customer preempting priority grade is less than the central area user's of set priority threshold value frequency resource.When terminal use belongs to central area user, frequency resource allocation further comprises step: determine the required frequency resource of customer service; As there are enough available frequency resources central area, directly carry out scheduling and the distribution of resource; As this central area User Priority grade is greater than set priority threshold value, terminal use's preempting priority is less than the frequency resource that the central area user of set priority threshold value is using.
This disturbance coordination method is on the basis of TD-LTE, combines the feature of trunked communication system.Trunked communication system, with half-duplex mode communication, passes through obtaining and discharging of PoC (Push To Talk, PTT) key control channel during work, channel utilization is high, and call proceeding is fast; In group, user shares down channel, and resource utilization is high.And trunked communication system can guarantee by voice encryption privacy and the fail safe of call; For high-priority users or business priority allocation channel; By fail soft function, guarantee the communication under the state of emergency; By dynamic restructuring, realize multi-level packet scheduling command function flexibly.This disturbance coordination method belongs to method for coordinating semi-static interference, and the distribution of frequency resource is not changeless, and Cell Edge User can be used centre frequency resource meeting under certain condition.Cluster user business has dividing of priority, and institute of the present invention extracting method has guaranteed the service quality of high-priority service effectively, has improved edge customer throughput simultaneously, has suppressed the interference of minizone.
Accompanying drawing explanation
Fig. 1 the present invention realizes the structural representation of Inter-Cell Interference Coordination device;
The seven cell illustraton of model that Fig. 2 the present invention subdistrict position used is divided and cell frequency resources is divided;
The flow chart of the inter-cell interference coordination method of Fig. 3 TD-LTE trunked communication system of the present invention;
Fig. 4 Cell Edge User resource of the present invention allocation flow figure;
Fig. 5 Cell Center User resource of the present invention allocation flow figure.
Embodiment
Below in conjunction with specific embodiment and accompanying drawing, the inter-cell interference coordination method of a kind of TD-LTE trunked communication system of the present invention is further set forth, to make spirit of the present invention, technical characterictic and beneficial effect are easier to understand.
The user that the present invention is positioned at edge, Target cell is subject to the interference of neighbor cell base station while carrying out downlink communication.
Be illustrated in figure 1 the structure chart that the present invention realizes Inter-Cell Interference Coordination device, this interference coordination device is arranged on base station end, comprising: resource division module, user type judge module, service priority judge module, resource judgment module, resource is seized module and scheduling of resource and distribution module.
Resource division module, is divided into cell edge frequency resource and center of housing estate frequency resource according to dividing threshold value by whole frequency resource.As being divided into mutually orthogonal three equal parts, wherein cell edge region can be used a copy of it, and whole frequency resource can be used in center of housing estate region, and especially, neighbor cell fringe region available frequency resources must mutually orthogonally could be used.Fringe region user can use centre frequency resource, and what first consideration was used is the part identical with fringe region user resource used, and what secondly consider is not by the central area frequency resource of other neighboring edge region CUs.
User type judge module is to belong to central area or fringe region by user feedback pilot frequency information judgement user.
Service priority judge module, first judges user's service priority grade, then compares with the priority threshold value of setting.
Resource judgment module, the required frequency resource of judgement customer service.
Resource is seized module, when user belongs to fringe region, by priority level, the central user traffic data rate lower than priority threshold value reduces gradually even and may interrupt in base station, reduces its frequency of utilization resource and uses until meet its service rate requirement to fringe region user.When user belongs to central area, by priority level, other central user traffic data rate lower than priority threshold value reduce gradually even and may interrupt in base station, and reducing its frequency of utilization resource has the user of high priority grade business to use to central area until meet its service rate and require.
Scheduling of resource and distribution module, dispatch available frequency resources and distribute to user until meet user's quality of service requirement.
As shown in Figure 2, be seven cell of the present invention illustraton of model.Community 1 is Target cell, and other neighbor cells are interfered cell.Each microzonation is divided into center of housing estate region and cell edge region, and whole frequency resource can be used in center of housing estate region, and cell edge region can be by 1/3rd of whole frequency resource, and wherein edge, neighbor cell available frequency resources is mutually orthogonal.It not is the changeless of static state that this frequency resource is divided, and when Cell Edge User meets certain condition, can use centre frequency resource.
The flow chart that is illustrated in figure 3 the inter-cell interference coordination method of TD-LTE trunked communication system of the present invention, comprises the steps:
1. resource division module is divided into cell edge frequency resource and center of housing estate frequency resource by frequency resource.Threshold value is divided in setting area, divides threshold value whole frequency resource is divided into central area frequency resource and fringe region frequency resource according to region.It is definite according to the covering radius of base station that threshold value is divided in region, and general optimum value is 2/3 of base station covering radius.As especially, can be divided into mutually orthogonal three equal parts, wherein cell edge region can be used a copy of it, and whole frequency resource can be used in center of housing estate region, and neighbor cell fringe region available frequency resources must be mutually orthogonal.
2. resource judgment module is determined the required frequency resource of business, judges whether user region has enough available frequency resources.According to type of service and the number that belongs to the group user of same type of service, determine required frequency resource;
3. user type judge module judges user's affiliated area.The pilot frequency information judgement user of user type judge module sense terminals reporting of user belongs to cell edge region or center of housing estate region;
4. service priority judge module judges user's service priority grade, and compares with the priority threshold value of setting.Wherein, priority level is divided by business, and session service priority is the highest, stipulating that its priority is 3, is secondly data services, stipulates that its priority is 2, video class service priority is minimum, stipulates that its priority is 1, and priority threshold value is the priority of defined.
5. when terminal use belongs to fringe region, resource is seized module, and by priority level, the central area user service data speed lower than priority threshold value reduces gradually, institute's frequency of utilization resource is used to fringe region user, until meet fringe region customer service rate requirement; When terminal use belongs to central area, resource is seized module, and by priority level, other central user traffic data rate lower than priority threshold value reduce gradually, to central area, there is the terminal use of high priority grade business to use institute's frequency of utilization resource, until meet the service rate of this high priority grade service-user, require;
6. scheduling of resource and distribution module are carried out scheduling of resource and distribution.
Be illustrated in figure 4 Cell Edge User frequency resource allocation flow chart of the present invention, comprise the steps:
1. determine that user belongs to cell edge region;
2. determine the required frequency resource of customer service;
3. judge whether fringe region has enough available frequency resources, if having, directly carry out scheduling and the distribution of resource; If no, execution step 4;
4. judging whether central area has can use frequency resource, if having, uses central area frequency resource and dispatches and distribute; If no, carry out step 5;
5. priority judge module judges that whether this customer service priority level is greater than set threshold value, if so, continues step 6; If not, return to step 2.
6. judge that central area is being used the priority level of the business that can use frequency resource whether to be less than set threshold value, if so, carry out step 7; If not, return to step 2;
7. the user of fringe region seizes central area user's frequency resource.The process of user's preempting resources is, the low user service data speed of priority level is reduced gradually even and may be interrupted, and reduces its frequency of utilization resource and uses until meet its service rate requirement to fringe region user.This step is seized module by resource and is carried out.
The threshold value of above-mentioned setting is the lowest class value of the service priority in cluster.
Be illustrated in figure 5 Cell Center User frequency resource allocation flow chart, step is as follows:
1. determine that user belongs to center of housing estate region;
2. determine the required frequency resource of customer service;
3. judge whether central area has enough available frequency resources, if so, directly carry out scheduling and the distribution of resource; If not, carry out step 4;
4. judge that whether this service priority grade is greater than set threshold value, if so, continues step 5; If not, return to step 2;
5. judge that whether central area is just less than set threshold value at the priority level of the business of frequency of utilization resource, if so, carry out step 6; If not, return to step 2;
6. just serviced user, seize other users' of central area frequency resource.
It should be noted last that, above embodiment is only for illustrating technical scheme of the present invention, and unrestricted, the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.
Claims (6)
1. the Inter-Cell Interference Coordination device based on TD-LTE trunked communication system, it is characterized in that, comprise: resource division module, user type judge module, service priority judge module, resource judgment module, resource are seized module and scheduling of resource and distribution module, resource division module is divided into cell edge frequency resource and center of housing estate frequency resource according to dividing threshold value by frequency resource; User type judge module belongs to central area or fringe region by the pilot frequency information judgement terminal use of user feedback; Service priority judge module judgement terminal use's service priority grade, compares with the priority threshold value of setting; The required frequency resource of resource judgment module judgement end-user service; When terminal use belongs to fringe region, resource is seized module, and by priority level, the central area user service data speed lower than priority threshold value reduces gradually, its resource is distributed to fringe region terminal use and use until meet its service rate requirement; When terminal use belongs to central area, resource is seized module, and by priority level, other central area user service data speed lower than priority threshold value reduce gradually, central area terminal use by these other central area user resources to high priority threshold value uses, until meet the central area customer service rate requirement of high priority grade business.
2. device according to claim 1, it is characterized in that, resource division module is divided into mutually orthogonal three equal parts by whole frequency resource, cell edge region user uses a copy of it, center of housing estate region user can use whole frequency resource, and neighbor cell fringe region available frequency resources is mutually orthogonal.
3. the inter-cell interference coordination method based on TD-LTE trunked communication system, is characterized in that, resource division module is divided into cell edge frequency resource and center of housing estate frequency resource according to dividing threshold value by whole frequency resource; User type judge module belongs to central area or fringe region by user feedback pilot frequency information judgement terminal use; Service priority judge module judgement user's service priority grade, compares with the priority threshold value of setting; The required frequency resource of resource judgment module judgement customer service; When terminal use belongs to fringe region, resource is seized module, and by priority level, the central area user service data speed lower than priority threshold value reduces gradually, and its resource is used until meet its service rate requirement to fringe region terminal use; When terminal use belongs to central area, resource is seized module, and by priority level, other central area user service data speed lower than priority threshold value reduce gradually, central area terminal use by these other central area user resources to high priority grade business uses, until meet the central area customer service rate requirement of high priority grade business.
4. method according to claim 3, it is characterized in that, resource division module is divided into mutually orthogonal three equal parts by whole frequency resource, cell edge region user uses a copy of it, center of housing estate region user can use whole frequency resource, and neighbor cell fringe region available frequency resources is mutually orthogonal.
5. method according to claim 3, is characterized in that, when terminal use belongs to Cell Edge User, frequency resource allocation further comprises step: determine the required frequency resource of this cell edge end-user service, judge whether institute's edge region has enough available frequency resources, if have, directly carry out scheduling and the distribution of resource, if do not have, judging whether central area has can use frequency resource, if have, can use frequency resource, using central area frequency resource dispatches and distributes, if central area does not have to dispatch frequency resource, priority judge module judges whether this edge termination customer service priority level is greater than set priority threshold value, as priority threshold value as described in being greater than, this edge termination user preempting priority grade is less than the central area user's of set priority threshold value frequency resource.
6. method according to claim 3, is characterized in that, when terminal use belongs to central area user, frequency resource allocation further comprises step: determine the required frequency resource of end-user service; As there are enough available frequency resources central area, directly carry out scheduling and the distribution of resource; As this central area terminal use's priority level is greater than set priority threshold value, preempting priority is less than the frequency resource that the central area user of set priority threshold value is using.
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