CN101754227A - Method and device for frequency allocation of relay system - Google Patents
Method and device for frequency allocation of relay system Download PDFInfo
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- CN101754227A CN101754227A CN200810184544A CN200810184544A CN101754227A CN 101754227 A CN101754227 A CN 101754227A CN 200810184544 A CN200810184544 A CN 200810184544A CN 200810184544 A CN200810184544 A CN 200810184544A CN 101754227 A CN101754227 A CN 101754227A
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Abstract
The invention discloses a method and a device for the frequency allocation of a relay system, relating to wireless communication system and solving the problem that the current relay system fails to allocate frequency resources to relay stations reasonably. The allocation method according to the embodiment of the invention comprises the steps: determining a target relay station requiring resource allocation; allocating frequency resources to the target relay station according to the utilization condition of frequency resources in the relay system, wherein the frequency resources are used for the target relay station and terminals the target relay station serves. The device according to the embodiment of the invention comprises: a determination unit for determining the target relay station requiring resource allocation; an allocation unit for allocating frequency resources to the target relay station according to the utilization condition of frequency resources in the relay system, wherein the frequency resources are used for the target relay station and terminals the target relay station serves. The method and the system are mainly used in base stations of the relay system.
Description
Technical field
The present invention relates to wireless communication system, relate in particular to the method and the device that in being provided with the relay system of relay station, carry out Frequency Distribution.
Background technology
Generally adopt cellular network architecture at wireless communication system,, then be called single-hop networks if be direct communication between all portable terminal (MS) and base station (BS) in the cellular network; If the part portable terminal in the cellular network need pass through relay station (RS) and base station communication, then be called multihop network, be also referred to as relay system.Wherein, single-hop networks comprises BS and two end points of MS, and relay system comprises BS, MS and RS, and BS wherein can support multi-hop relay.
The general method that adopts channeling is improved the availability of frequency spectrum of communication system in cellular network, for single-hop networks, because the communication frequency that MS adopted is all directly by BS control, and the dividing frequency resource reasonably of the BS in each sub-district like this.
For relay system, part MS need communicate by letter with BS by RS, so just needs BS that a part of frequency resource allocation is utilized to RS, below the method for the present relay system medium frequency distribution of concrete analysis.
As shown in Figure 1, cell edge is planned to 3 sectors, a relay station distributes in each sector, and the whole frequency of frequency resource is divided into 3 frequency sub-band, these 3 frequency sub-band are allocated in advance respectively to described 3 relay stations use, in relay system shown in Figure 1, provide the center of housing estate of service can utilize whole frequency to communicate by BS, and at the cell edge that service is provided by relay station, MS can utilize different frequency sub-band to communicate according to affiliated relay station is different, so just can guarantee not have between the RS in the sub-district so the co-channel interference minimum of co-channel interference or existence, and the minizone uses the distance between the RS of corresponding frequency sub-band maximum, makes the co-channel interference minimum of the RS between different districts.As shown in Figure 2, in some cases, cell edge is planned to 6 sectors, a RS (totally 6 RS) distributes in each sector, but the whole frequency of frequency resource still is divided into 3 frequency sub-band, these 3 frequency sub-band are being allocated in advance respectively when using to described 6 relay stations, two RS that just are positioned on the diagonal need multiplexing identical frequency sub-band.
State in realization in the process of frequency allocation plan, the inventor finds that there are the following problems at least in the prior art:
The frequency allocation method of relay system is after finishing Frequency Distribution at present, all frequency resources distribute and all allocate in advance, can not adjust flexibly, but when practice, the random distribution of RS position, the variation of RS number or the situations such as traffic carrying capacity variation of RS often appear in the relay system, and the frequency allocation method of existing relay system can not be adjusted the frequency resource allocation of relay system under the above-mentioned situation flexibly, causes the relay system frequency resource rationally not utilize.
Summary of the invention
Embodiments of the invention provide a kind of frequency allocation method and device of relay system, can reasonably adjust the distribution condition of relay system medium frequency resource at relay system.
For achieving the above object, embodiments of the invention adopt following technical scheme:
A kind of frequency allocation method of relay system comprises:
Need to determine the target relay station of Resources allocation;
The situation of utilizing according to relay system medium frequency resource is target relay station dividing frequency resource, and described frequency resource is used for the terminal of target relay station and its service and uses.
A kind of frequency assigning apparatus of relay system comprises:
Determining unit is used to need to determine the target relay station of Resources allocation;
Allocation units are used for being target relay station dividing frequency resource according to the situation of utilizing of relay system medium frequency resource, and described frequency resource is used for the terminal of target relay station and its service and uses.
The frequency allocation method of the relay system that the embodiment of the invention provides and device, after determining target relay station, the situation of utilizing according to relay system medium frequency resource is target relay station dividing frequency resource, and then the current frequency resource allocation state of adjustment relay system, when making the situations such as traffic carrying capacity variation of the variation of the random distribution that occurs the RS position in the relay system, RS number or RS, can adjust the frequency resource allocation of relay system, make the utilization of frequency resource adjust to more reasonably state.
For example:, then after this relay station that has just added is finished initial access by access channel, be its original allocation one band frequency resource if exist relay station just to add relay system.In the process of relay system operate as normal, if the signal of the link of relay station and interference-to-noise ratio are less than predetermined value, there is larger interference in the expression relay station when using the frequency resource of original allocation, cisco unity malfunction, if the embodiment of the invention is defined as target relay station with the relay station of this cisco unity malfunction, just can redistribute frequency resource, make that relay station can operate as normal, realize the reasonable utilization of frequency resource for it.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is a kind of Frequency Distribution schematic diagram of relay system in the prior art;
Fig. 2 is the another kind of Frequency Distribution schematic diagram of relay system in the prior art;
Fig. 3 is the flow chart of the frequency allocation method embodiment of relay system of the present invention;
Fig. 4 is the device block diagram of the frequency allocation method embodiment of relay system of the present invention;
Fig. 5 is the initial frequency allocation method flow chart that inserts of relay station in the embodiment of the invention 1;
Fig. 6 is the frequency allocation method flow chart in the relay station course of work in the embodiment of the invention 1;
Fig. 7 is the frequency assigning apparatus block diagram of relay system in the embodiment of the invention 1;
Fig. 8 is the initial frequency allocation method flow chart that inserts of relay station in the embodiment of the invention 2;
Fig. 9 is the frequency allocation method flow chart in the relay station course of work in the embodiment of the invention 2;
Figure 10 is the frequency assigning apparatus block diagram of relay system in the embodiment of the invention 2;
Figure 11 is the general resource map of a kind of frequency of the embodiment of the invention;
Figure 12 is the another kind of general resource map frequently of the embodiment of the invention;
Figure 13 is a kind of Frequency Distribution schematic diagram of single-hop networks;
Figure 14 is the another kind of Frequency Distribution schematic diagram of single-hop networks;
Figure 15 is the another kind of general resource map frequently of the embodiment of the invention;
Figure 16 is the frequency assigning apparatus block diagram of the another kind of system that continues in the embodiment of the invention;
Figure 17 is the frequency assigning apparatus block diagram of the another kind of system that continues in the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of frequency allocation method of relay system, and as shown in Figure 3, this method specific implementation comprises:
301, need to determine the target relay station of Resources allocation.
302, after determining to need the target relay station of Resources allocation, be target relay station dividing frequency resource according to the situation of utilizing of relay system medium frequency resource, described frequency resource is used for the terminal of target relay station and its service and uses.
The embodiment of the invention provides a kind of frequency assigning apparatus of relay system, and as shown in Figure 4, this device comprises: determining unit 41 is used to need to determine the target relay station of Resources allocation; Allocation units 42 are used for being target relay station dividing frequency resource according to the situation of utilizing of relay system medium frequency resource that described frequency resource is used for the terminal of target relay station and its service and uses.
The process of above-mentioned definite target relay station can be achieved as follows: judge that whether link signal quality between described relay station and its terminal (MSs) is less than predetermined value; During less than predetermined value, is relay station dividing frequency resource in described link signal quality again, and wherein the dividing frequency resource comprises and distributes new frequency resource, comprises also and distribute a frequency resource multiplexing with other relay stations that detailed description is seen below and stated embodiment.
Generally speaking, the link signal quality refers to that described relay station covers the SINR (signal and interference-to-noise ratio) or the CINR (carrier wave and interference-to-noise ratio) of end side acquisition down between relay station and the terminal, and perhaps the relay station side detects the SINR (signal and interference-to-noise ratio) or the CINR (carrier wave and interference-to-noise ratio) of its terminal on this link.Wherein detected SINR of end side or CINR terminal can directly report BS, also can the testing result of terminal be transmitted to BS via relay station.
Initiate relay station is finished network by access channel and is initially inserted the back (for example: have a specific channel to be used for inserting among the 802.16j, relay station can be finished access procedure on this channel.), the embodiment of the invention is the new relay station original allocation one band frequency resource that adds, so that initiate relay station can operate as normal.The position that the base station can obtain RS after the relay station access is finished, information such as traffic carrying capacity.Regular phase of relay station or irregularly carry out neighbours' input, and report the base station, the base station also can regular or irregular acquisition RS and the signal quality information of its terminal links simultaneously.Signal quality information end side obtains between this relay station and terminal links specifically SINR (signal and interference-to-noise ratio) or CINR (carrier wave and interference-to-noise ratio), perhaps relay station SINR that side obtains (signal and interference-to-noise ratio) or CINR (carrier wave and interference-to-noise ratio).
The frequency allocation method of the relay system that the embodiment of the invention provides and device, after determining target relay station, the situation of utilizing according to relay system medium frequency resource is target relay station dividing frequency resource, and then the current frequency resource allocation state of adjustment relay system, when making the situations such as traffic carrying capacity variation of the variation of the random distribution that occurs the RS position in the relay system, RS number or RS, can adjust the frequency resource allocation of relay system, make the utilization of frequency resource adjust to more reasonably state.
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Embodiment 1:
As shown in Figure 5, the embodiment of the invention also provides a kind of frequency allocation method of relay system, and this distribution method is carried out by the base station, and this method specifically comprises the steps:
When 501, in relay system, having initiate relay station, this relay station is finished network by access channel and is just inserted, for example: have a specific channel to be used for inserting among the 802.16j, RS can finish access procedure on this channel, then this newly can be added as relay station be defined as target relay station.
502, after described relay station access is finished, the base station is according to the position of the described target relay station of being obtained, and information such as traffic carrying capacity are directly for this relay station distributes new frequency resource, so that the new frequency resource of target relay station utilization provides service for the user.
The flow process of above-mentioned Fig. 5 has been finished initial access back relay station acquisition frequency resource and has been used for described target relay station and its terminal room link, if in the course of normal operation of this relay station, need carry out the adjustment of frequency resource, as shown in Figure 6, the frequency resource adjustment process in course of normal operation comprises:
601, regularly/non-signal and the interference-to-noise ratio of obtaining link between described relay station and its terminal termly.
602, whether judge the signal of the link between described relay station and its terminal and interference-to-noise ratio less than predetermined value, if signal and interference-to-noise ratio less than predetermined value, then are defined as target relay station with this relay station, then execution in step 603; Otherwise flow process finishes, and does not promptly need to carry out the adjustment of frequency resource.
In general, in this process of execution, described signal and interference-to-noise ratio are meant less than predetermined value: the signal of the link between the terminal of relay station and a predetermined level is exceeded and interference-to-noise ratio be all less than predetermined value, execution in step 603 just at this moment, otherwise flow process finishes.
Under the another kind of situation, in this process of execution, described signal and interference-to-noise ratio are meant less than predetermined value: relay station and surpass the signal of the link between the terminal of predetermined ratio and interference-to-noise ratio all less than predetermined value, execution in step 603 just at this moment, otherwise flow process finishes.
Can be particularly in all links of RS and its terminal (MSs), wherein the terminal SINR that surpasses predetermined ratio a% illustrates lower above its link-quality of terminal that accounts for total number of terminals a% all less than predetermined value.Need execution in step 603 this moment.
Adopt signal and interference noise recently to weigh the link signal quality in the present embodiment, in the specific implementation, can adopt the parameter except that signal and interference-to-noise ratio to weigh the link signal quality, for example: CINR (carrier wave and interference-to-noise ratio).
603, give up the presently used frequency resource of target relay station, and execution in step 604, so that redistribute frequency resource for relay station.
604, directly distribute new frequency resource,, and provide service for the user so that the new frequency resource of this target relay station utilization is linked into relay system for target relay station.
The embodiment of the invention also provides a kind of frequency assigning apparatus of relay system, and as shown in Figure 7, this device comprises: allocation units 71, determining unit 72 and acquiring unit 73.
At first determine that by determining unit 72 initiate relay stations are target relay station, for the frequency assignment procedure that new adding relay station carries out can be finished by allocation units 71, at this moment, allocation units 71 are used for after the new relay station that adds relay system is finished the initial access of network, for described relay station directly distributes new frequency resource.
In the course of normal operation of relay station, acquiring unit 73 is used for regularly/non-signal and the interference-to-noise ratio of obtaining the link of relay station termly; Described determining unit 72 comprises judge module 721 and determination module 722 (seeing Fig. 7 dotted portion), whether judge module 721 is used to judge the signal of described relay station and its terminal (MSs) link and interference-to-noise ratio less than predetermined value, and determination module 722 is used for this relay station being defined as target relay station in described signal and interference-to-noise ratio during less than predetermined value; Described allocation units 71 also are used to give up the frequency resource of the current use of target relay station, and are that relay station directly distributes new frequency resource.
Generally speaking, that describes among above-mentioned Fig. 5, Fig. 6 and Fig. 7 directly has following two kinds of implementations for this relay station distributes new frequency resource: if the frequency resource that current existence does not utilize in this relay system then uses to described relay station the current frequency resource allocation of not utilizing; If the frequency resource that does not have current existence not utilize then can use to described relay station the employed component frequency resource transfers of other relay stations in the sub-district.
The embodiment of the invention need redistributed for relay station under the situation of frequency resource, and what relay station used may be the frequency resource of not utilizing, and also can use the component frequency resource that other relay stations shift out in the sub-district, makes the relay station can operate as normal.For relay station distributes the frequency resource of described not utilization or the component frequency resource that other relay stations shift out, like this can be so that frequency resource is fully used frequency resource, and not can with the multiplexing same band frequency resource of other relay stations in this sub-district, can improve the service quality of relay station.
Embodiment 2:
As shown in Figure 8, the embodiment of the invention also provides a kind of frequency allocation method of relay system, and this distribution method is carried out by the base station, and this method specifically comprises the steps:
When 801, in relay system, having initiate relay station, this relay station is finished network by access channel and is just inserted, and initiate relay station is defined as target relay station, for example: have a specific channel to be used for inserting among the 802.16j, RS can finish access procedure on this channel.
802, for rigidly connect into relay station for, the base station obtain the described relay station that reports by described target relay station detected its all around the signal strength signal intensity of neighbours' relay station.
803, judging whether to have neighbours' relay station is in the predetermined threshold with mutual interference mutually between the described target relay station; Be in the predetermined threshold with mutual interference mutually between the described target relay station if having neighbours' relay station, then execution in step 804; Otherwise execution in step 806.
Interference described in the present embodiment is in the predetermined threshold and comprises: the interference that present embodiment needs the target relay station of dividing frequency resource to measure neighbours' relay station is in subscribes in the thresholding, perhaps needing the interference of the target relay station of dividing frequency resource to be in the reservation thresholding in the present embodiment that neighbours' relay station measures, can certainly be that these two interference all are in the predetermined threshold.
Generally speaking, can represent above-mentioned interference parameter by the signal strength signal intensity that measures mutually between the relay station, for example: by RSSI (Receive Signal StrengthIndicator, the intensity of received signal) the information representation interference parameter that measures mutually between the relay station.
804, from all and mutual interference mutually between the described target relay station are in neighbours' relay station in the predetermined threshold, select neighbours' relay station, and carry out 805.
Preferably, can be from all and mutual interference mutually between the described target relay station be in neighbours' relay station in the predetermined threshold in this process, select neighbours' relay station with the mutual interference minimum mutually of described target relay station.Because the signal strength signal intensity that the minimum described target relay station of expression of phase mutual interference and neighbours' relay station measure mutually all is best suited for carrying out multiplexing, described target relay station can guarantee best multiplexing effect with neighbours' relay station channelized frequencies resource of selecting, the embodiment of the invention does not limit the algorithm of concrete selection, generally speaking, can adopt but be not limited to following algorithm:
Earlier from described target relay station between mutual interference mutually be in neighbours' relay station in the predetermined threshold, select neighbours' relay station of the signal strength signal intensity minimum that this target relay station measures, if there are a plurality of such neighbours' relay stations, then can measure neighbours' relay station of the signal strength signal intensity minimum of this relay station therefrom selecting neighbours' relay station.Like this, just can obtain neighbours' relay station of phase mutual interference minimum.
805, give described target relay station multiplexing the employed frequency resource allocation of selecting of neighbours' relay station, and enter course of normal operation.Because the signal strength signal intensity that target relay station and this neighbours' relay station measure mutually is minimum and is positioned at predetermined threshold, like this, when multiplexing same band frequency resource communicated, the interference meeting of appearance was less relatively, had guaranteed the operate as normal of target relay station and described neighbours' relay station.
806, judge currently whether have available new frequency resource, if there is available new frequency resource, then execution in step 807; Otherwise execution in step 808.
807, be that described target relay station is distributed new frequency resource, the new frequency resource in the present embodiment can be current frequency resource of not utilizing or the component frequency resource that other relay station transfers are shifted out from this sub-district.If described new frequency resource is the component frequency resource that other relay station transfers are shifted out from this sub-district, be to use for described target relay station than extracting some frequency resources the rich relay station out in general, and enter course of normal operation from other frequency resources.
808, select neighbours' relay station with the mutual interference minimum mutually of described target relay station, give target relay station multiplexing the employed frequency resource allocation of selected neighbours' relay station, and enter course of normal operation.Do not limit its concrete algorithm of selecting in this process, can adopt algorithm similar in the step 804.
The flow process of above-mentioned Fig. 8 has been finished initial access back relay station acquisition frequency resource and has been used for described target relay station and its terminal room link, if in the course of normal operation of this target relay station, need carry out the adjustment of frequency resource, as shown in Figure 9, the frequency resource adjustment process in course of normal operation comprises:
901, in the course of normal operation of relay station, relay station cycle or irregularly carry out neighbours' input, obtain the signal strength signal intensity of neighbours' relay station, and report the base station, the base station also can obtain link signal quality information between described relay station and its terminal (MSs) simultaneously.So in the relay station course of normal operation, present embodiment needs regularly/non-signal and the interference-to-noise ratio of obtaining described relay station and its terminal (MSs) link termly, and the detected signal strength information of neighbours' relay station on every side of described relay station.
902, judge that whether the signal of the link between described relay station and its terminal and interference-to-noise ratio are less than predetermined value, if signal and interference-to-noise ratio are less than predetermined value, then this relay station needing to be defined as the new target relay station of dividing frequency resource, and execution in step 903; Otherwise flow process finishes, and does not promptly need to carry out the adjustment of frequency resource.
In general, in this process of execution, described signal and interference-to-noise ratio are meant less than predetermined value: at this moment the signal of the link between the terminal of relay station and a predetermined level is exceeded or predetermined ratio and interference-to-noise ratio are less than predetermined value,, ability execution in step 903, otherwise flow process finishes.
Adopt signal and interference noise recently to weigh the link signal quality in the present embodiment, in the specific implementation, can adopt the parameter except that signal and interference-to-noise ratio to weigh the link signal quality, for example: CINR (carrier wave and interference-to-noise ratio).
903, the frequency resource of giving up the new current use of target relay station, and execution in step 512 are so that redistribute frequency resource for target relay station.
904, judging whether to have neighbours' relay station is in the predetermined threshold with mutual interference mutually between the described new target relay station; Be in the predetermined threshold with mutual interference mutually between the described new target relay station if having neighbours' relay station, then execution in step 905; Otherwise execution in step 907.
Interference described in the present embodiment is in the predetermined threshold and comprises: present embodiment needs the new target relay station of dividing frequency resource to measure the interference of neighbours' relay station, and the interference that needs the new target relay station of dividing frequency resource in the present embodiment that measures of neighbours' relay station, and these two interference all need to be positioned at predetermined threshold.
Generally speaking, can represent above-mentioned interference parameter by the signal strength signal intensity that measures mutually between the relay station, for example: by RSSI (Receive Signal StrengthIndicator, the intensity of received signal) the information representation interference parameter that measures mutually between the relay station.
905, from all and mutual interference mutually between the described new target relay station are in neighbours' relay station in the predetermined threshold, select neighbours' relay station, and carry out 906.
Can be from all and mutual interference mutually between the described new target relay station be in neighbours' relay station in the predetermined threshold in this process, select neighbours' relay station with the mutual interference minimum mutually of described new target relay station, because the signal strength signal intensity that the described new target relay station of the minimum expression of phase mutual interference and neighbours' relay station measure mutually all is best suited for carrying out multiplexing, described new target relay station can guarantee best multiplexing effect with neighbours' relay station channelized frequencies resource of selecting, the embodiment of the invention does not limit the algorithm of concrete selection, generally speaking, can adopt but be not limited to following algorithm:
Earlier from described new target relay station between mutual interference mutually be in neighbours' relay station in the predetermined threshold, select neighbours' relay station of the signal strength signal intensity minimum that this new target relay station measures, if there are a plurality of such neighbours' relay stations, then can measure neighbours' relay station of the signal strength signal intensity minimum of this relay station therefrom selecting neighbours' relay station.Like this, just can obtain neighbours' relay station of phase mutual interference minimum.
906, give described new target relay station multiplexing the employed frequency resource allocation of selecting of neighbours' relay station.Because the signal strength signal intensity that new target relay station and this neighbours' relay station measure mutually is minimum and is positioned at predetermined threshold, like this, when multiplexing same band frequency resource communicates, the interference meeting that occurs is less relatively, has guaranteed the operate as normal of new target relay station and described neighbours' relay station.
907, judge currently whether have available new frequency resource, if there is available new frequency resource, then execution in step 908; Otherwise execution in step 909.
908, be that described new target relay station is distributed new frequency resource, the new frequency resource in the present embodiment can be current frequency resource of not utilizing or the component frequency resource that other relay station transfers are shifted out from this sub-district.If described new frequency resource is the component frequency resource that other relay station transfers are shifted out from this sub-district, be to use for described new target relay station than extracting some frequency resources the rich relay station out in general from other frequency resources.
909, select neighbours' relay station with the mutual interference minimum mutually of described relay station, give new target relay station multiplexing the employed frequency resource allocation of selected neighbours' relay station.Do not limit its concrete algorithm of selecting in this process, can adopt algorithm similar in the step 905.
The embodiment of the invention also provides a kind of frequency assigning apparatus of relay system, and as shown in figure 10, this device comprises: allocation units 10-1, determining unit 10-2 and acquiring unit 10-3.
By behind the access channel connecting system, described determining unit 10-2 is defined as target relay station with the relay station of this connecting system at relay station, and described acquiring unit 10-3 is used for regularly/the non-signal strength signal intensity of obtaining neighbours' relay station that target relay station reports termly; Described then allocation units 10-1 takes all factors into consideration above-mentioned signal strength signal intensity, and is target relay station dividing frequency resource according to certain rule.
In the target relay station course of normal operation, described acquiring unit 10-3 also needs regularly/non-signal and the interference-to-noise ratio of obtaining the link between described relay station and its terminal (MSs) termly, and determine new target relay station by determining unit 10-2, be specially determining unit 10-2 and comprise judge module 10-21 and determination module 10-22, wherein judge module 10-21 is used to judge that whether the signal of link of relay station and interference-to-noise ratio are less than predetermined value; If described signal and interference-to-noise ratio are less than predetermined value, determination module 10-22 is defined as new target relay station with this relay station, allocation units 10-1 takes all factors into consideration above-mentioned signal strength signal intensity, and is new target relay station dividing frequency resource again according to certain rule.
Under above-mentioned two kinds of situations, the concrete assigning process of allocation units 10-1 can adopt identical scheme, particularly, these allocation units 10-1 comprises: first selects module 10-11, the first judge module 10-12, distribution module 813, the second judge module 10-14 and second to select module 10-15.
Wherein, the first judge module 10-12 is used to judge whether to have neighbours' relay station and is in the predetermined threshold with mutual interference mutually between the described target relay station; When having neighbours' relay station and mutual interference mutually between the described target relay station be in the predetermined threshold, first selects module 10-11 to be used for selecting neighbours' relay station from neighbours' relay station that all and mutual interference mutually between the described new target relay station are in the predetermined threshold, and preferred the realization is that the first selection module 10-11 selects the neighbours' relay station with the mutual interference minimum mutually of described target relay station; Distribution module 10-13 is used for this employed frequency resource allocation of neighbours' relay station of selecting and gives described target relay station multiplexing.
When the interference between described target relay station and selected neighbours' relay station is not in the predetermined threshold, these allocation units select module 10-15 and distribution module 10-13 to finish Frequency Distribution work by the second judge module 10-14, second, wherein, the second judge module 10-14 is used for judging whether to exist available new frequency resource when not having neighbours' relay station and mutual interference mutually between the described target relay station is in the predetermined threshold; Described distribution module 10-13 also is used for when having available new frequency resource, is that target relay station is distributed new frequency resource.
Described second selects module 10-15, be used for when not having available new frequency resource, select the neighbours' relay station with the mutual interference minimum mutually of described target relay station, described distribution module 10-13 also is used for selecting the employed frequency resource allocation of the selected neighbours' relay station of module to give described target relay station multiplexing with second.
The new frequency resource of distributing in the said process specifically can be in the following way: 1, give described target relay station with the current frequency resource allocation of not utilizing; 2, shifting the component frequency resource from the frequency resource that other relay stations of this sub-district use uses for described target relay station.
The embodiment of the invention need redistributed for relay station under the situation of frequency resource, what relay station used may be the frequency resource of not utilizing, can the multiplexing frequency resource of having been utilized by neighbours' relay station, but, present embodiment with the situation of neighbours' relay station channelized frequencies resource under, selected neighbours' relay station of measured signal strengths minimum, and the embodiment of the invention is further defined to target relay station and the multiplexing condition with the band frequency resource of neighbours' relay station: whether the minimum signal strength of neighbours' relay station that relay station reports is in the predetermined threshold, to guarantee that the interference between target relay station and the neighbours' relay station is positioned at the scope that can accept, has guaranteed the operate as normal of target relay station and described neighbours' relay station.
Simultaneously, when the minimum signal strength of the neighbours' relay station that reports at relay station is not in the predetermined threshold, need distribute new frequency resource, to guarantee the operate as normal of relay station for it.
Can not use both there being new frequency resource, and when the interference between described relay station and the selected neighbours' relay station is not in the predetermined threshold, the embodiment of the invention has still been selected neighbours' relay station relatively preferably, the frequency resource of multiplexing its use makes relay station can carry out work.
In the foregoing description 1 and embodiment 2, relay station newly adds the frequency resource allocation mode of relay system and the mode of operate as normal medium frequency resource adjustment is identical, when practice, can carry out in different ways in these two processes.That is: when relay station newly adds relay system, adopt the direct method of salary distribution (process of Fig. 3) among the embodiment 1, and in course of normal operation, adopt the adjustment mode (process of Fig. 9) of the frequency resource among the embodiment 2; Perhaps, when relay station newly adds relay system, adopt the method for salary distribution (process of Fig. 8) of the frequency resource among the embodiment 2, and in course of normal operation, adopt the adjustment mode (process of Fig. 4) of the frequency resource among the embodiment 1.
The situation of embodiment of the invention utilization may be as follows:
When a RS1 was arranged in the sub-district, BS came dividing frequency according to RS1 traffic carrying capacity and disturbed condition.BS will divide a plurality of frequency sub-band/subchannels (representing with f11, f12 or the like) in the F1 frequency range, RS1 utilizes f11 wherein, and all the other subchannel BS can be used for direct transmission user MS.
Shown in a figure among Figure 11, be linked in the sub-district as RS2, the relay station number is increased to 2 in the sub-district, BS passes through such scheme, comprehensively the position of these two relay stations, traffic carrying capacity, interference (SINR/CINR) and the neighbours' signal strength signal intensity or the like of surveying that reports are separately distributed to the new frequency resource of RS2 or two multiplexing identical frequency resources of RS particularly.If adopt the scheme shown in Fig. 8 and Fig. 9 to distribute, then can be so that the frequency resource of this sub-district utilizes situation to be: RS1 utilizes f11 wherein, and RS2 utilizes f12.
Two relay stations among Figure 11 among a figure can not be subjected to the co-channel interference of other relay stations owing to used different frequency sub-band in this sub-district, the relative position of two relay stations in the sub-district can not be restricted so.
If RS1 and RS2 position distance is distant, then can draws and to carry out Frequency Distribution and multiplexingly just can all adopt f11, the realization channeling by the decision criteria among Fig. 8 and Fig. 9; BS can also be used for all the other subchannels direct transmission user MS.Shown in the b figure among Figure 11.If employed frequency resource just takies the part of whole frequency resources, remainder is used for BS and its direct transmission user so.
The situation of embodiment of the invention utilization also may be as follows:
Shown in a figure among Figure 12, current in the sub-district have two relay stations and used frequency sub-band f1 and f2 to communicate respectively, under initiate relay station situation, can directly use idle frequency sub-band f3 so, the position relation between three relay stations in this sub-district is unrestricted at this moment.
Shown in the b figure among Figure 12, if the frequency resource of a frequency range is made as a whole frequency sub-band F1, and there have been two multiplexing frequency sub-band F1 of relay station, so under initiate relay station situation, if relay station is relative far away with original relay station distance, the signal strength signal intensity of the measurement neighbours relay station that reports separately of other relay stations of relay station and sub-district all is under the situation in the predetermined threshold so, relay station can also be multiplexing frequency sub-band F1, be equivalent to three relay stations and all used whole frequency resources.
Shown in the c figure among Figure 12.RS1 for example, RS2 and RS3 use f1 respectively, f2, and f3, the traffic carrying capacity of 3 RS is the same.3 RS report neighbours' signal strength signal intensity periodically.RS1 reports the RS2 that surveyed and the signal strength signal intensity of RS3, and RS2 reports the signal strength signal intensity of RS1 and RS3, and RS3 reports the signal strength signal intensity of RS1 and RS2.If the signal strength signal intensity of the RS1 that RS3 surveyed is lower than threshold value, the signal strength signal intensity of the measured RS3 of RS1 is lower than threshold value, and the signal strength signal intensity of the RS2 that RS3 and RS1 surveyed is higher than threshold value, BS can judge that RS1 and RS3 can channelized frequencies so, RS2 then can not and RS1, the common multiplexing frequency of RS3.So BS can allow RS1 and RS3 use f1 and f3 jointly particularly, RS2 uses f2 constant.Other frequencies are used for BS-MS communication.
BS can also control RS1 and RS3 uses f1 jointly or uses f3 jointly, and RS2 uses f2 constant.Remaining frequency sub-band is used for BS and communicates by letter with MS (portable terminal).
As shown in figure 13, the figure shows the frequency resource allocation situation of a part of wireless communication system, be specially: the whole frequency of frequency resource is divided into 4 frequency sub-band, use frequency sub-band A to communicate at the center of each sub-district, and only use one of frequency sub-band B, C or D to communicate respectively at cell edge, and the transmitting power of each frequency sub-band is fixed and identical.Perhaps also can adopt scheme shown in Figure 14: the whole frequency of frequency resource is divided into 4 frequency sub-band, and wherein, the central area of each sub-district uses frequency sub-band A to communicate, and cell edge region uses one of frequency sub-band B, C or D to communicate.For the sub-district of each, also have two frequency sub-band not use, then these two frequency sub-band that do not have to utilize are distributed to this center of housing estate use.The central area scope is little, and the transmitting power of other frequency sub-band of central area except frequency sub-band A is adjusted into 1/3 of normal transmission power, and fringe region uses normal transmission power, weakens the interference to neighbor cell.
The distribution method that is adopted in the embodiment of the invention can obtain to Fig. 3 similar with Fig. 4 utilize situation, specific implementation is that the embodiment of the invention can be handled when existing relay station to withdraw from relay system accordingly, at first, judge whether the used frequency resource of relay station that withdraws from relay system is re-used; Under the situation that the used frequency resource of the relay station that withdraws from relay system is not re-used, can select following two kinds of processing modes:
First, the frequency resource allocation that the relay station that withdraws from relay system is used is used to center of housing estate, application is seen Figure 15 like this, with the situation in the sub-district 1 is the example explanation, the center of sub-district 1 has used two frequency range F2 and F3 to communicate, the edge of sub-district 1 has used frequency range F1 to communicate, but, frequency range F1 is divided into 3 frequency range f1, f2 and f3, and three relay stations have used frequency sub-band f1 respectively, f2 and f3 communicate, after the relay station that uses frequency sub-band f3 withdraws from, frequency sub-band f3 is distributed to the center of housing estate use, can not cause the waste of frequency sub-band f3 like this, also can improve the user experience at 1 center, sub-district simultaneously.
The second, will withdraw from the used frequency resource of the relay station of relay system as the frequency resource of not utilizing,, can give initiate relay station this part frequency resource allocation of not utilizing if there is new relay station to add afterwards.
The embodiment of the invention provides a kind of frequency assigning apparatus of relay system, and as shown in figure 16, this device comprises: allocation units 161 and determining unit 162 and judging unit 163.
Wherein, when there is the relay station that newly adds relay system in determining unit 162 it is defined as target relay station, allocation units 161 are used to target relay station original allocation one band frequency resource, initially insert so that relay station can be finished network; Determining unit 162 also is used for determining target relay station in course of normal operation, this determining unit 162 comprises judge module 1621 and determination module 1622 particularly, and judge module 1621 is used to judge that whether the signal of the link between described relay station and its terminal (MSs) and interference-to-noise ratio are less than predetermined value; In described signal and interference-to-noise ratio during less than predetermined value, determination module 1622 is defined as target relay station with it, and described allocation units 161 are given up the frequency resource for the target relay station original allocation, and redistributes frequency resource for target relay station.When existing relay station to withdraw from relay system, judging unit 163 is used to judge whether the used frequency resource of relay station that withdraws from relay system is re-used; When the used frequency resource of the relay station that withdraws from relay system is not re-used, described allocation units 161 are used for the frequency resource allocation that the relay station that withdraws from relay system is used to be used to center of housing estate, perhaps will withdraw from the used frequency resource of the relay station of relay system as the frequency resource of not utilizing.
Both do not having relay station to add, also do not having under the situation that relay station withdraws from, the embodiment of the invention also needs to carry out according to the working condition of each relay station the distribution of correspondent frequency resource.During specific implementation, judging at first whether the present load of relay station surpasses nominal load, if the present load of relay station surpasses nominal load then this relay station is defined as target relay station, and is target relay station dividing frequency resource.The method of its concrete dividing frequency resource can described to redistribute the method for frequency resource consistent for initiate relay station with Fig. 3, Fig. 4 or Fig. 8, Fig. 9, repeats no more herein.
Corresponding to above-mentioned situation of carrying out the distribution of correspondent frequency resource according to the working condition of each relay station, the embodiment of the invention also provides a kind of frequency assigning apparatus of relay system, and as shown in figure 17, this device comprises: allocation units 171 and determining unit 172.
Wherein, determining unit 172 is used for when having the relay station of new adding relay system it being defined as target relay station, and allocation units 171 are used to target relay station original allocation one band frequency resource, initially insert so that relay station can be finished network; Determining unit 172 also is used for determining target relay station in course of normal operation, this determining unit 172 comprises judge module 1721 and determination module 1722 particularly, and judge module 1321 is used to judge that whether the signal of the link between described relay station and its terminal (MSs) and interference-to-noise ratio are less than predetermined value; In described signal and interference-to-noise ratio during less than predetermined value, determination module 1722 is defined as target relay station with it, and described allocation units 171 are given up the frequency resource for the target relay station original allocation, and redistributes frequency resource for target relay station.
Under the situation that the number of relay station does not change, determining unit 172 also needs to determine target relay station, and described judge module 1721 is used to also judge whether the present load of relay station surpasses nominal load; When the present load of relay station surpassed nominal load, described determination module 1722 also was used for it is defined as target relay station, and described allocation units 171 are given up the frequency resource for the target relay station original allocation, and redistributed frequency resource for target relay station.
The embodiment of the invention is mainly used in the base station of relay system, particularly changing appears in relay station quantity in relay system or position, or under the situation that changing appears in performance parameter such as traffic carrying capacity in the relay system, the embodiment of the invention can be carried out redistributing of frequency resource.
Through the above description of the embodiments, the those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential common hardware, can certainly pass through hardware, but the former is better execution mode under a lot of situation.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium that can read, floppy disk as computer, hard disk or CD etc., comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion by described protection range with claim.
Claims (18)
1. the frequency allocation method of a relay system is characterized in that, comprising:
Need to determine the target relay station of Resources allocation;
The situation of utilizing according to relay system medium frequency resource is target relay station dividing frequency resource, and described frequency resource is used for the terminal of target relay station and its service and uses.
2. the frequency allocation method of relay system according to claim 1 is characterized in that, describedly need to determine the target relay station of Resources allocation to comprise:
To newly add the relay station of relay system as target relay station; Perhaps
Judge that whether link signal quality between relay station and the terminal is less than predetermined value; If described link signal quality then is defined as target relay station with this relay station less than predetermined value; Perhaps
Judge whether the relay station present load surpasses nominal load; If this relay station present load surpasses nominal load, then this relay station is defined as target relay station.
3. the frequency allocation method of relay system according to claim 1 is characterized in that, described link signal quality is signal and interference-to-noise ratio, and before judging that link signal quality between relay station and the terminal is whether less than predetermined value, this method also comprises:
Regularly/non-signal and the interference-to-noise ratio of obtaining link between relay station and the terminal termly.
4. the frequency allocation method of relay system according to claim 2, it is characterized in that, described link signal quality less than predetermined value is: the link signal quality between the terminal of relay station and a predetermined level is exceeded is all less than predetermined value, perhaps, relay station and surpass link signal quality between the terminal of predetermined ratio all less than predetermined value.
5. according to the frequency allocation method of claim 1,2,3 or 4 described relay systems, it is characterized in that the described situation of utilizing according to relay system medium frequency resource comprises for target relay station dividing frequency resource:
For described target relay station is directly distributed new frequency resource; Perhaps
Judging whether to have neighbours' relay station is in the predetermined threshold with mutual interference mutually between the described target relay station; Be in the predetermined threshold with mutual interference mutually between the described relay station if having neighbours' relay station, then select neighbours' relay station with the mutual interference minimum mutually of described relay station; From with described target relay station between mutual interference mutually be in and select neighbours' relay station neighbours' relay station in the predetermined threshold, give described target relay station multiplexing the employed frequency resource allocation of selecting of neighbours' relay station.
6. the frequency allocation method of relay system according to claim 5, it is characterized in that, described from described target relay station between mutual interference mutually be in and select neighbours' relay station to be neighbours' relay station in the predetermined threshold: from and described target relay station between the phase mutual interference be in neighbours' relay station in the predetermined threshold, select neighbours' relay station with the mutual interference minimum mutually of described target relay station.
7. the frequency allocation method of relay system according to claim 5 is characterized in that, the described situation of utilizing according to relay system medium frequency resource also comprises for relay station dividing frequency resource for target relay station dividing frequency resource:
If there is no there is neighbours' relay station to be in the predetermined threshold, then judges whether to exist available new frequency resource with mutual interference mutually between the described target relay station;
If there is available new frequency resource, then distribute new frequency resource for target relay station;
If there is no available new frequency resource is then selected the neighbours' relay station with the mutual interference minimum mutually of described target relay station, and gives described target relay station multiplexing the employed frequency resource allocation of selected neighbours' relay station.
8. the frequency allocation method of relay system according to claim 6 is characterized in that, described selecting with neighbours' relay station of the mutual interference minimum mutually of described target relay station comprises:
Select neighbours' relay station that described target relay station measures the signal strength signal intensity minimum;
If neighbours' relay station of selecting more than one, is then selected the neighbours' relay station that measures described target relay station signal strength signal intensity minimum from selected neighbours' relay station.
9. the frequency allocation method of relay system according to claim 5 is characterized in that, described new frequency resource is the current frequency resource of not utilizing, and perhaps new frequency resource is the component frequency resource that other relay stations shift out in the sub-district.
10. the frequency allocation method of relay system according to claim 5 is characterized in that, the signal strength expression that described interference measures mutually by described target relay station and neighbours' relay station.
11. the frequency allocation method of relay system according to claim 1 is characterized in that, this method also comprises:
When existing relay station to withdraw from relay system, judge whether the used frequency resource of relay station that withdraws from relay system is re-used;
If withdrawing from the used frequency resource of the relay station of relay system is not re-used, then will withdraw from the used frequency resource allocation of relay station of relay system and use, perhaps will withdraw from the used frequency resource of the relay station of relay system as the frequency resource of not utilizing to center of housing estate.
12. the frequency assigning apparatus of a relay system is characterized in that, comprising:
Determining unit is used to need to determine the target relay station of Resources allocation;
Allocation units are used for being target relay station dividing frequency resource according to the situation of utilizing of relay system medium frequency resource, and described frequency resource is used for the terminal of target relay station and its service and uses.
13. the frequency allocation method of relay system according to claim 12 is characterized in that,
Described determining unit will newly add the relay station of relay system as target relay station; Perhaps
Described determining unit comprises: judge module is used to judge that whether link signal quality between relay station and the terminal is less than predetermined value; Determination module is used for during less than predetermined value, this relay station being defined as target relay station in described link signal quality; Perhaps
Described determining unit comprises: judge module is used to judge whether the relay station present load surpasses nominal load; Determination module is used for when this relay station present load surpasses nominal load this relay station being defined as target relay station.
14. the frequency assigning apparatus of relay system according to claim 12 is characterized in that, described link signal quality is signal and interference-to-noise ratio, and this device also comprises:
Acquiring unit is used for regularly/non-signal and the interference-to-noise ratio of obtaining link between relay station and the terminal termly.
15. the frequency assigning apparatus according to claim 12,13 or 14 described relay systems is characterized in that:
Described allocation units are used to target relay station directly to distribute new frequency resource; Perhaps
Described allocation units comprise: first judge module is used to judge whether to have neighbours' relay station and is in the predetermined threshold with mutual interference mutually between the described target relay station; First selects module, be used for when having neighbours' relay station and mutual interference mutually between the described target relay station is in the predetermined threshold, from described target relay station between mutual interference mutually be in neighbours' relay station in the predetermined threshold and select neighbours' relay station; Distribution module, the employed frequency resource allocation of neighbours' relay station that is used to select give described target relay station multiplexing.
16. the frequency allocation method of relay system according to claim 15, it is characterized in that, described first select module from described target relay station between mutual interference mutually be in neighbours' relay station in the predetermined threshold, select neighbours' relay station with the mutual interference minimum mutually of described target relay station.
17. the frequency allocation method of relay system according to claim 15 is characterized in that, described allocation units also comprise:
Second judge module is used for judging whether to exist available new frequency resource when not having neighbours' relay station and mutual interference mutually between the described target relay station is in the predetermined threshold; Described distribution module also is used for when having available new frequency resource, is that target relay station is distributed new frequency resource;
Second selects module, be used for when not having available new frequency resource, select the neighbours' relay station with the mutual interference minimum mutually of described target relay station, described distribution module also is used for selecting the employed frequency resource allocation of the selected neighbours' relay station of module to give described target relay station multiplexing with second.
18. the frequency assigning apparatus of relay system according to claim 12 is characterized in that, this device also comprises:
Judging unit is used for when existing relay station to withdraw from relay system, judges whether the used frequency resource of relay station that withdraws from relay system is re-used;
Described allocation units are used for when the used frequency resource of the relay station that withdraws from relay system is not re-used, the frequency resource allocation that the relay station that withdraws from relay system is used is used to center of housing estate, perhaps will withdraw from the used frequency resource of the relay station of relay system as the frequency resource of not utilizing.
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| CN200810184544A CN101754227A (en) | 2008-12-08 | 2008-12-08 | Method and device for frequency allocation of relay system |
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