CN100551154C - The resource allocation of centralized base station and signal method for routing - Google Patents
The resource allocation of centralized base station and signal method for routing Download PDFInfo
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Abstract
The invention provides a kind of method that is used in the centralized base station of wireless communication system, carrying out channel resource allocation, comprise: be respectively each initiate Radio Link and select the preferred channels processing unit, so that the Channel Processing relevant with each initiate Radio Link all carried out in selected corresponding preferred channels processing unit respectively.Also providing a kind of can carry out adaptive resource scheduling and load balancing method finishing on the basis of above-mentioned channel resource allocation, this method realizes that according to the statistics to the load condition of each channel bank in the described centralized base station adaptive resource of each channel bank dispatches and load balancing.And provide a kind of centralized base station that realizes above-mentioned channel resource allocation method.Thus,, it can be assigned to a preferred channels processing unit and handle each initiate Radio Link (comprising newly-established and because the Radio Link that grand diversity increases), thus the maximization of realization channel processing resource utilance.
Description
Technical field
The present invention relates to distributed type base station technology field in the mobile communication system, particularly resource allocation and the control method in the centralized base station systems that adopts radio frequency unit to zoom out.
Background technology
1. centralized base station general introduction
In mobile communication system, emission, reception and the processing of wireless signal finished in base station (BTS), traditional BTS mainly is made up of baseband, radio frequency (RF) subsystem and antenna, and a BTS can cover different honeycombs (sub-district) by a plurality of antennas, shown in Fig. 1 (a); Each BTS then links to each other with base station controller (BSC) or radio network controller (RNC) respectively by certain interface, constitutes wireless access network (RAN) thus, shown in Fig. 1 (b).
Fig. 2 has provided another kind of distributed base station, promptly adopts the system configuration of the centralized base station that radio frequency unit zooms out.Compare with the traditional base station, the centralized base station that this employing radio frequency unit zooms out has many advantages: allow to adopt a plurality of Microcells to substitute the macrocell based on the traditional base station, thereby can adapt to different wireless environments better, wireless performances such as the capacity of raising system and covering; Centralized structure makes soft handover to finish with More Soft Handoff, thereby obtains extra processing gain; Centralized structure makes that also expensive base band signal process resource becomes the shared resource pool in a plurality of sub-districts, thereby obtains the benefit of statistic multiplexing, and effectively lowers system cost.PCT patent " WO9005432, Communications system "; United States Patent (USP) " US5657374; Cellular system with centralized base stations anddistributed antenna units ", " US6324391, Cellular communication withcentralized control and signal processing "; Chinese patent application " CN1471331, the base station system of mobile communication "; And U.S. Patent application " US20030171118, Cellular radio transmission apparatus and cellularradio transmission method " etc. has all disclosed the relevant realization details of this technology.
As shown in Figure 2, the centralized base station systems that adopts radio frequency unit to zoom out is mainly handled master unit (MU) 10 by the center channel of installing concentratedly and is formed with a plurality of long-distance radio frequency units (RRU) 20, link to each other by broadband transmission link or network between them, the BSC/RNC interface unit then is responsible for finishing the user's face and the signaling plane processing of BTS and BSC/RNC interface.Center channel is handled master unit and mainly is made up of functional units such as channel processing resource pond and signal route assignment unit, wherein, the channel processing resource pond is piled up by a plurality of channel banks and is formed, finish work such as base band signal process, signal route assignment unit then comes the dynamic assignment channel processing resource according to the difference of each cell business volume (Traffic), thereby it is shared to realize that resources effective is handled in many sub-districts.Signal route assignment unit except as shown in Figure 2 MU is inner realize, also can be used as independent equipment and realize in that MU is outside.Long-distance radio frequency unit mainly is made of functional units such as the low noise amplifier of the radio-frequency power amplifier of transmission channel, receive path and antennas.The link that center channel is handled master unit 10 and long-distance radio frequency unit typically can adopt transmission mediums such as optical fiber, copper cable, microwave; Signal transmission form can be the digital signal after sampling, or modulated analog signal; Signal can adopt baseband signal, intermediate-freuqncy signal or radiofrequency signal.
Be not difficult to find out that from above-mentioned introduction a main advantage of centralized base station is to make the base band signal process resource to become the shared resource pool in a plurality of sub-districts, thereby obtain the benefit of statistic multiplexing and effectively lower system cost prior art.Therefore, distribution how to carry out channel processing resource effectively is the key point of centralized base station.
2. channel processing resource and centralized base station structure
In code division multiple access (CDMA) system, the chip-level processing unit that the base band signal process resource mainly is core by reception technique such as Multiuser Detection (MUD) with RAKE receiver or other enhancing and form with symbol level processing unit two parts that channel coding/decoding is treated to core, wherein, symbol level is handled with customer service type and speed in close relations, and chip-level handles that influenced by user's type of service and speed relation very little, and it is main relevant with the Traffic Channel number.
In supporting many sectors overloading fairly large base station system frequently, the Channel Processing funtion part typically has two kinds of possible structures, the one, chip-level processing unit and symbol level processing unit be integrated on the single integrated circuit board realize that system is made up of the configurable channel processing module of a plurality of quantity; The 2nd, the chip-level processing unit is realized on different integrated circuit boards respectively with the symbol level processing unit, promptly system is made up of configurable chip-level processing module of a plurality of quantity and symbol level processing module.The typical case that Fig. 3 and Fig. 4 have provided above-mentioned two kinds of structures realizes example.
Shown in Figure 3 by chip-level processing unit and symbol level processing unit in the representative instance of integrated system configuration, system is made up of the individual independently channel processing module of M, so-called " independence " is meant that they finish corresponding Channel Processing task separately and do not have internal signal to interconnect.Owing to there is not the internal signal interconnection, make the design of System Backplane bus simplify greatly, thereby help constituting fairly large centralized base station, although intermodule is unfavorable for effective utilization of system resource independently of one another, but the full software implement scheme based on a plurality of microprocessing unit array structures of digital signal processor (DSP) or parallel processing has also appearred in existing base band signal process solution, because the flexibility of software in processor resource scheduling, reduced this structure greatly in the deficiency of system resource aspect effectively utilizing.
In the representative instance of the system configuration that chip-level processing unit shown in Figure 4 separates with the symbol level processing unit, system is made up of P chip-level processing module and Q symbol level processing module.Wherein, the chip-level processing module is independently of one another, be that they are finished corresponding chip-level Processing tasks separately and do not have the internal signal interconnection, because the chip-level processing speed is very high, the chip-level processing module is carried out the internal signal interconnection each other will make system configuration complicated, and difficulty is used in fairly large centralized base station; On the other hand, because speed is relatively low, the symbol level processing module allows to carry out the internal signal interconnection to realize handling resource-sharing, therefore the symbol level processing section can be regarded as continuous single processing module.
As seen, all there is the discontinuous problem of channel processing resource in above-mentioned two kinds of typical implementation structures, simultaneously in fairly large centralized base station, because the limited processing ability of each channel bank, when the RRU that can support when centralized base station is larger, the wireless signal of all RRU can both be exchanged to each channel bank simultaneously just do not have practical significance.Simultaneously, because the wireless signal streaming rate is very high, be subjected to the restriction of signal route assignment unit and system complexity, it also is to be difficult to realize that the wireless signal of all RRU can both be exchanged to each channel bank simultaneously, therefore, each channel bank can simultaneously treated RRU number of signals always limited, that is to say not allly can both exchange to certain channel bank simultaneously with the corresponding wireless signal of RRU this centralized base station.
Summary of the invention
Therefore, according to above-mentioned analysis, the assignment problem of channel processing resource in the centralized base station of prior art further can be summed up as such problem to Fig. 3 and channel processing system structure representative instance shown in Figure 4:
● to each initiate Radio Link (comprising newly-established and because the Radio Link that grand diversity increases), it should be assigned to which channel bank and handle, and the wireless signal of corresponding this Radio Link place sub-district RRU is routed to the channel bank of this distribution?
Wherein, above-mentioned channel bank is to promptly corresponding each channel processing module of channel processing system structure shown in Figure 3, to channel processing system structure shown in Figure 4 is that correspondence code chip level processing module is (because the symbol level processing section is continuous single processing module, do not have above-mentioned assignment problem, its internal resource scheduling is not considered in the present invention).The present invention has proposed a kind of effective solution at the problems referred to above just.
Therefore, an object of the present invention is to provide a kind of method that is used for carrying out channel resource allocation in the centralized base station of wireless communication system, the method comprising the steps of:
Be respectively each initiate Radio Link and select the preferred channels processing unit, so that the Channel Processing relevant with each initiate Radio Link all carried out in selected corresponding preferred channels processing unit respectively.Wherein, describedly select the step of preferred channels processing unit to comprise following substep for each initiate Radio Link in the access procedure: for each channel bank in the centralized base station, the sub-district that this centralized base station is controlled all is divided into corresponding one group and has other set of cells of different resource distribution stage; Resource allocation level according to the set of cells of being divided is selected the preferred channels processing unit for each initiate Radio Link from high to low, preferentially in the high set of cells of resource allocation level, select, when only in the high set of cells of resource allocation level, can not find optimum channel bank, just in the lower set of cells of resource allocation level, select the channel bank of described optimum successively.
In an embodiment of above-mentioned channel resource allocation method, also comprise step:
According to access procedure in the relevant parameter of each described initiate Radio Link, utilize system's known resource model information to quantize the resource occupation amount of described each initiate Radio Link, and to come based on the resource occupation amount of described each the initiate Radio Link that quantizes to obtain be that each initiate Radio Link is selected preferred channels processing unit.
A kind of preferred implementation according to above-mentioned channel resource allocation method, be that each initiate Radio Link is selected in the step of preferred channels processing unit, making that the Radio Link corresponding district of being responsible for handling with each selected preferred channels processing unit is adjacent as far as possible geographically and concentrate on certain zone.
As seen, each initiate Radio Link (comprising newly-established and because the Radio Link that grand diversity increases) is selected optimum channel bank, can realize that each channel processing resource is in the optimized distribution of this point in the base station according to said method.On this basis, in order to make the maximization of channel processing resource utilance, can also between each channel bank, carry out scheduling of resource according to the medium-term and long-term statistics of this centralized base station channel bank load, with the processing load of each channel bank of balance.
Therefore, another object of the present invention provides a kind of be used for carrying out adaptive resource scheduling and load balancing method in the centralized base station of wireless communication system, and the method comprising the steps of:
According to statistics to the load condition of each channel bank in the described centralized base station, the parameter relevant with the load sharing of each channel bank in the Adjustment System resource model information adaptively is so that realize the adaptive resource scheduling and the load balancing of each channel bank;
And,
Be based upon the determined resource occupation amount of each initiate Radio Link, be respectively described each initiate Radio Link and select the preferred channels processing unit, so that the Channel Processing relevant with each initiate Radio Link all carried out in selected corresponding preferred channels processing unit respectively.
In a kind of execution mode of above-mentioned adaptive resource scheduling of the present invention and load balancing method, adjacent as far as possible geographically with the Radio Link corresponding district of being responsible for handling for the preferred channels processing unit of each initiate Radio Link selection and concentrate on certain zone.
A kind of preferred implementation according to above-mentioned adaptive resource scheduling and load balancing method, for each channel bank in the centralized base station, the sub-district that this centralized base station is controlled all is divided into corresponding one group of other set of cells of different resource distribution stage; And, select the preferred channels processing unit for each initiate Radio Link from high to low according to the resource allocation level of the set of cells of being divided.
According to a further object of the present invention, a kind of centralized collection station that is used to realize the channel resource allocation method of the invention described above is provided, this centralized base station comprises:
Center channel is handled master unit MU;
A plurality of long-distance radio frequency unit RRU, it links to each other by broadband transmission link or network and center channel processing master unit MU couples;
Wherein, described centralized base station also comprises
The preferred channels alternative pack is used to be respectively each initiate Radio Link and selects the preferred channels processing unit, so that the Channel Processing relevant with each initiate Radio Link all carried out in selected corresponding preferred channels processing unit respectively;
Wherein, described preferred channels alternative pack comprises:
Set of cells is divided subassembly, is used for each channel bank to centralized base station, and the sub-district that this centralized base station is controlled all is divided into corresponding one group and has other set of cells of different resource distribution stage; With
Channel chooser parts, be used for selecting the preferred channels processing unit for each initiate Radio Link from high to low according to the resource allocation level of the set of cells of being divided, preferentially in the high set of cells of resource allocation level, select, when only in the high set of cells of resource allocation level, can not find the channel bank of described optimum, just in the lower set of cells of resource allocation level, select the channel bank of described optimum successively.
According to a kind of execution mode of above-mentioned centralized base station of the present invention, described preferred channels alternative pack is configured to select the preferred channels processing unit for each initiate Radio Link according to the resource occupation amount of described each the initiate Radio Link that utilizes system's known resource model information to quantize.In a kind of preferred implementation, described preferred channels alternative pack is configured to make that the Radio Link corresponding district of being responsible for handling with each selected preferred channels processing unit is adjacent as far as possible geographically and concentrates on certain zone.
Need to prove, although for convenience of description, the present invention is that example is described with the cdma system, but basic thought of the present invention, spirit, principle and method, to the mobile communication system of other standard, be still suitable as FDMA (frequency division multiple access), TDMA (time division multiple access), OFDM (orthogonal frequency-division) etc.
As mentioned above, according to the present invention, the distribution of channel processing resource is decomposed into two relatively independent processing procedures in the centralized base station, and the one, each initiate Radio Link (comprising newly-established and because the Radio Link that grand diversity increases) is selected optimum channel bank; Another is the medium-term and long-term statistics according to this centralized base station channel bank load, between each channel bank, carry out scheduling of resource, with the processing load of each channel bank of balance, thereby reach the maximized purpose of channel processing resource utilance.Clearly, previous processing procedure can realize the optimization to the distribution of channel processing resource in the centralized base station, and processing then then is the further improvement to previous process.
Description of drawings
With reference to the detailed description of each accompanying drawing to the specific embodiment of the invention, characteristics of the present invention, benefit will become more obvious.In each accompanying drawing:
Fig. 1 (a) illustrates traditional BTS structure;
Fig. 1 (b) illustrates traditional wireless accessing network structure;
Fig. 2 illustrates the centralized base station systems structure that adopts radio frequency unit to zoom out;
Fig. 3 illustrates in the base station system of prior art in the Channel Processing funtion part chip-level and handles and the integrated system configuration of symbol level processing unit;
Fig. 4 illustrates in the base station system of prior art in the Channel Processing funtion part chip-level and handles the system configuration of separating with the symbol level processing unit;
Fig. 5 illustrates the schematic diagram of three kinds of set of cells of each channel bank of centralized base station according to an embodiment of the invention;
Fig. 6 a is illustrated in the schematic flow diagram of the Radio Link preferred channels processing unit selection course that realizes in the centralized base station according to an embodiment of the invention;
Fig. 6 b illustrates the detail flowchart of the preferred channels processing unit selection course among Fig. 6 a;
Fig. 7 a illustrates first kind of situation according to an embodiment of channel processing resource adaptive scheduling of the present invention and load balancing method;
Fig. 7 b illustrates second kind of situation according to an embodiment of the method for channel processing resource adaptive scheduling of the present invention and load balancing.
Embodiment
Below in conjunction with each accompanying drawing specific embodiments of the invention are described in detail.
1. the resource allocation in the access procedure
According to the present invention, when Radio Link newly adds (comprising newly-established and because the Radio Link that grand diversity increases), need to select to carry out the preferred channels processing unit that respective channel is handled, for this reason, need carry out the analysis and the assessment of resource occupation to this initiate Radio Link, according to the analysis of front, related centralized base station systems resource mainly contains:
chip-level processing unit resource;
symbol level processing unit resource (only to channel processing system structure shown in Figure 3);
Each channel bank of allows the simultaneously treated RRU wireless signal channel resource that promptly allows to exchange simultaneously or be routed to each channel bank at most;
And as previously mentioned, it takies the Radio Link of different rates and type of service chip-level and handles resource to handle resource with symbol level be different, newly-established Radio Link and simultaneously because the Radio Link that grand diversity increases is also different aspect occupying system resources, therefore need be according to speed, type of service, whether be the radio link parameters such as Radio Link that grand diversity increases, quantize the resource occupation amount of each initiate Radio Link, so that carry out the analysis and the assessment of resource occupation.In view of the base station is to determine knownly to system resource model informations such as the average resource occupancy of various speed and type service, channel processing resource structures, therefore in fact this selection processing of carrying out the preferred channels processing unit that respective channel handles is equivalent to a table lookup operation.
According to the present invention, the preferred channels processing unit of each initiate Radio Link in the access procedure (comprising newly-established and because the Radio Link that grand diversity increases) is selected to follow following principle: promptly, the selection of preferred channels processing unit should take the RRU signalling channel resource of each channel bank as few as possible; The RRU wireless signal of each sub-district, grand diversity branch place can exchange to same channel bank to realize the More Soft Handoff processing when soft handover was taken place; Reduce as far as possible because the handover operation of striding channel bank that portable terminal causes at mobile process such as different districts switchings.
In fact, when the mobile communication system that is adopted is supported soft hand-off, handle all grand diversity branches of a portable terminal simultaneously at same channel bank, help reducing the consumption of system handles resource, help improving and cover and wireless performances such as capacity.Even the mobile communication system that is adopted is not supported soft hand-off, cdma system as TDD (time division duplex) pattern, still carry out if portable terminal moves the Channel Processing of its Radio Link when different districts switches, can reduce the context (context) relevant between the different channels processing unit with this portable terminal at same channel bank
The migration operation of information reduce the operation of carrying out relevant parameter configuration and operation at new channel bank, thereby the simplified system complexity helps the raising of the stability of a system and reliability.
According to mentioned above principle, in a kind of preferred implementation of the present invention, the Radio Link corresponding district that the preferred channels processing unit of each initiate Radio Link in the access procedure (comprising newly-established and because the Radio Link that grand diversity increases) is selected to make each channel bank be responsible for handling is adjacent as far as possible geographically and concentrate on certain zone, like this, will help taking as few as possible the RRU signalling channel resource of each channel bank; The RRU wireless signal of each sub-district, grand diversity branch place can exchange to same channel bank and improves wireless performance to realize More Soft Handoff to handle when helping making as far as possible soft handover to take place; Help reducing as far as possible because the handover operation of striding channel bank that portable terminal causes at mobile process such as different districts switchings.
Specifically, the preferred implementation of selecting according to the preferred channels processing unit of each initiate Radio Link in this access procedure of the present invention (comprising newly-built and because the Radio Link that grand diversity increases) is as described below.
At first, for each channel bank in the centralized base station, the sub-district that this centralized base station is controlled all is divided into corresponding one group of other set of cells of different resource distribution stage, in this nonrestrictive preferred embodiment mode, microzonation can be divided into basic sub-district, three set of cells of candidate cell and residue sub-district, the Traffic Channel of sub-district in its basic cell set of each channel bank priority treatment, next is the Traffic Channel of sub-district in the candidate cell collection, is the Traffic Channel of sub-district in the residue cell set at last.According to the present invention, cell classification should be followed following principle:
Each sub-district one under this centralized base station of fixes on one and only in the basic set of cells of a channel bank, this channel bank is called the home channel processing unit of this sub-district, therefore, the basic set of cells of all channel banks occur simultaneously for the sky union be whole sub-districts under this centralized base station;
The basic sub-district of is the geographical adjacent set of cells of, therefore help taking as few as possible the RRU signalling channel resource of each channel bank, the RRU wireless signal of each sub-district, grand diversity branch place can exchange to same channel bank when helping soft handover is taken place, thereby can realize More Soft Handoff in a channel bank;
Sub-district in the candidate set of each channel bank of is the adjacent geographically peripheral cell in sub-district in the basic set of cells with this channel bank, therefore be the basic set of cells part of coverage expansion geographically, because overlapping covering, a sub-district may be in the candidate set of a plurality of channel banks simultaneously.As described later, candidate cell when the sub-district in the candidate set is load sharing, promptly have channel processing resource more than needed and other channel bank Channel Processing load when big when certain channel bank, this channel bank can preferentially provide channel processing resource for the sub-district in its candidate set.If comprise some sub-district in the basic set of cells of other channel bank in the candidate set of certain channel bank, then this channel bank is called the adjacent channel processing unit of these channel banks;
residue set of cells is the affiliated subdistrict set of other this centralized base station except that basic sub-district and candidate cell.Since the sub-district of residue in the set of cells geographically with the handled sub-district of its channel bank apart from each other, therefore may consume too much RRU signalling channel resource, and difficult realization More Soft Handoff is handled, selection when therefore as described later, only just meeting is as load sharing under opposite extreme situations.
Fig. 5 has provided the schematic diagram of above-mentioned three kinds of set of cells, in this embodiment, centralized base station has 9 channel banks, the D1 of institute's mark among the basic set of cells of each channel bank correspondence such as the figure, D2 ... the D9 zone, after adding its corresponding candidate set, expand to the E1 of institute's mark among the figure, E2 ... the E9 zone, wherein each zone has all comprised sub-district adjacent on the geography of some.Can see, the basic set of cells of all channel banks has just in time covered whole sub-districts of this centralized base station, there is and has only a home channel processing unit arbitrary sub-district, and still, a sub-district may be simultaneously in the candidate set of a plurality of channel banks.
Fig. 6 a and 6b are this preferred implementation according to the present invention, the flow chart of the Radio Link preferred channels processing unit selection course that realizes in centralized base station.Wherein, Fig. 6 a illustrates the exemplary flow of this preferred channels selection course.As shown in the figure, at step S50, for each channel bank in the centralized base station, the sub-district of this centralized base station being controlled according to mode shown in Figure 5 all is divided into corresponding one group and has other set of cells of different resource distribution stage; At step S60, select the preferred channels processing unit for each initiate Radio Link from high to low according to the resource allocation level of the set of cells of being divided; At step S70, return the result that preferred channels is selected processing, promptly whether successfully selected the preferred channels processing unit for each initiate Radio Link.
Fig. 6 b illustrates the detailed process flow process of step S60 and S70 among Fig. 6 a.As shown in the figure, when the base station receive newly-built from the Radio Link of BSC/RNC or the message that increases after (step S100), promptly carry out corresponding message and handle and obtain parameters such as this wireless link rate, type of service, consider the factor of newly-built Radio Link and increase Radio Link simultaneously, utilize system's known resource model information to quantize the resource occupation amount (step S110) of this Radio Link, search the sub-district and the corresponding RRU signal (step S120) at this Radio Link place simultaneously; Judge then whether the home channel processing unit of its sub-district, place can put forward enough required resource (comprising chip-level processing unit resource, symbol level processing unit resource, RRU wireless signal channel resource etc.) (step S130) for this Radio Link; If the judged result of step S130 is a "No", be that its home channel processing unit can not provide resource requirement, then search the channel bank (step S140) that all candidate cell set comprise this sub-district, Radio Link place, judge successively that by available resources size order from high to low can corresponding channel bank provide required resource (step S150) for this Radio Link then; If the judged result of step S150 is a "No", these promptly all channel banks still can not provide resource needed, then judge successively by available resources size order from high to low whether other channel bank can provide required resource (step S160) for this Radio Link, if still can not find the channel bank that satisfies the demands, then return Radio Link and set up or increase failed message and point out that failure cause is to handle resource not enough (step S210) to BSC/RNC.As long as in above-mentioned each time resource judgment, find the channel bank that satisfies resource requirement then to stop follow-up judgement, whether the RRU wireless signal of judging this sub-district, Radio Link place then has been routed to this channel bank (step S170), if route then is not routed to this channel bank (step S180) with this RRU wireless signal as yet, be this wireless link distribution and dispose corresponding channel processing resource then, upgrade the statistical information (step S190) of respective channel processing unit resource situation, and return the message (step S200) that Radio Link is set up or increase is successful to BSC/RNC.
In above-mentioned Radio Link preferred channels processing unit selection course, the preferential home channel processing unit of selecting its sub-district, place, thereby help taking as few as possible the RRU signalling channel resource of each channel bank, and the RRU wireless signal of each sub-district, grand diversity branch place can exchange to same channel bank and handles to realize More Soft Handoff when soft handover is taken place; During angelica channel bank inadequate resource, based on same purpose, should consider that candidate cell set comprises the channel bank of this sub-district, Radio Link place, this thing happens mainly is because the near zone active users and the traffic carrying capacity at the place, basic sub-district of its home channel processing unit cause more greatly, therefore need share excessive load for it by adjacent channel bank, when existing a plurality of candidate cell set to comprise the channel bank of this sub-district, Radio Link place and required processing resource can be provided, then select the minimum channel bank of load to realize the channel bank load balancing; Have only when certain extreme case that the area business amount is very high in a big way appears in short-term in system, just understanding provide load sharing processing by non-conterminous channel bank.
Though for the preferred channels processing unit of realizing each initiate Radio Link in the access procedure (comprising newly-established and because the Radio Link that grand diversity increases) is selected, the embodiment that is adopted is that the Radio Link corresponding district that makes each channel bank be responsible for handling is adjacent as far as possible geographically and concentrate on certain zone.But; those skilled in the art are to be understood that; this preferred embodiment is not the restriction that is intended to the technical scheme of in the centralized collection of this realization of the present invention station preferred channels processing unit of initiate Radio Link being selected, and other those skilled in the art do not need to spend embodiment that creative work can expect and will be understood that yet and drop in protection scope of the present invention.For example, can also there be other to select for the mode classification of the set of cells of each channel bank, as long as the respective classified mode helps to realize the optimized allocation of resources of above-mentioned centralized base station.
2. adaptive resource is dispatched and load balancing
According to the present invention, on the basis that above-mentioned Radio Link preferred channels processing unit is selected, can also be according to the medium-term and long-term statistics of channel bank load in the centralized base station, between each channel bank, carry out scheduling of resource, with the processing load of each channel bank of balance, thereby reach the maximized purpose of channel processing resource utilance.
Therefore, the present invention also provides a kind of method that realizes above-mentioned each channel bank load balancing.The method according to this invention, medium-term and long-term statistics according to centralized base station channel bank load, self adaptation is adjusted the set of cells based on the load sharing purpose of each channel bank, for example above-mentioned in conjunction with the candidate set in the preferred real mode shown in Figure 5, thus reach the purpose of each channel bank load balancing.
In first kind of situation of the preferred embodiment of the method according to this invention, the instantaneous load situation of each channel bank in the centralized base station is added up (on average) load that obtains each channel bank in the certain hour scope, and obtain the total average load amount of all channel banks by arithmetic average, when if the load of certain channel bank exceeds the certain thresholding of this overall average, then suitably increase the candidate set of the adjacent channel processing unit of this channel bank, wherein the sub-district of Zeng Jiaing is adjacent sub-district on the sub-district geography in the basic set of cells of this channel bank and the candidate set corresponding adjacent channel processing unit, each adjacent channel processing unit candidate set increase what also depend on separately load, be that the bigger adjacent channel processing unit candidate set increase of load is less, the less adjacent channel processing unit candidate set of load increases more; Simultaneously, suitably reduce the candidate set of this channel bank, the load that how much also depends on each adjacent channel processing unit that reduces, even the load of its certain adjacent channel processing unit is bigger, the sub-district that belongs to the basic set of cells of this adjacent channel processing unit of then reducing in its candidate set is less, if the load of its certain adjacent channel processing unit is less, the sub-district that belongs to the basic set of cells of this adjacent channel processing unit of then reducing in its candidate set is more.
Fig. 7 (a) is the schematic diagram of this first kind of situation.Shown in Fig. 7 (a), certain centralized base station comprises three channel bank A, B, C, corresponding respectively basic sub-district A, B, C, if the load of channel bank B exceeds the certain thresholding of overall average, based on above-mentioned first kind of preferred version, its adjacent channel processing unit A then, the candidate set of C will increase, and the candidate set of channel bank B will reduce, if the load of channel bank A is greater than the load of channel bank C, then the recruitment of channel bank A candidate set is littler than the recruitment of channel bank C candidate set, and to belong to the sub-district of the basic set of cells of channel bank C few in the sub-district that belongs to the basic set of cells of channel bank A of reducing in the candidate set of channel bank B.
In second kind of situation of the preferred embodiment of this method according to the present invention, the instantaneous load situation of each channel bank in the centralized base station is added up (on average) load and the total average load amount (identical) of all channel banks that obtains each channel bank in the certain hour scope with the processing of above-mentioned first kind of situation, when if the load of certain channel bank is lower than the certain thresholding of overall average, then suitably increase the candidate set of this channel bank, the load that how much depends on each adjacent channel processing unit that increases, even the load of its certain adjacent channel processing unit is bigger, the sub-district that belongs to the basic set of cells of this adjacent channel processing unit that then increases in its candidate set is more, if the load of its certain adjacent channel processing unit is less, the sub-district that belongs to the basic set of cells of this adjacent channel processing unit that then increases in its candidate set is less; Simultaneously, suitably reduce the candidate set of the adjacent channel processing unit of this channel bank, the load that how much also depends on each adjacent channel processing unit that reduces, it is more to be that the bigger adjacent channel processing unit candidate set of load reduces, and the less adjacent channel processing unit candidate set of load reduces less.
Fig. 7 (b) be this and the schematic diagram of two kinds of situations.Certain centralized base station comprises three channel bank A, B, C, corresponding respectively basic sub-district A, B, C, if the load of channel bank B is lower than the certain thresholding of overall average, based on above-mentioned second kind of preferred version, its adjacent channel processing unit A then, the candidate set of C will reduce, and the candidate set of channel bank B will increase, if the load of channel bank A is less than the load of channel bank C, then the decrease of channel bank A candidate set is littler than the decrease of channel bank C candidate set, and to belong to the sub-district of the basic set of cells of channel bank C few in the sub-district that belongs to the basic set of cells of channel bank A that increases in the candidate set of channel bank B.
It will be appreciated by those skilled in the art that, in above-mentioned adaptive resource scheduling of the present invention and load balancing method, the parameter that is used to judge the channel bank load of machinery systems can also be chosen other suitable judgement parameters except the total average load amount of all channel banks.For example, the weighted average load that all channel banks are total, or the function of the total average load amount of all channel banks, as aP+b, a wherein, b is a constant, P is the total average load amounts of all channel banks; Or the like.Employed threshold value in the time of need adjusting mutually the load of certain channel bank as for judgement also can be provided with according to actual conditions by the technical staff.
Though above-mentioned two kinds of methods of the present invention preferably realize with software,, clearly these methods equally also can be with well known to a person skilled in the art that various hardware modules or structure realize.Therefore, anyly make up the hardware configuration that realizes said method of the present invention with known hardware configuration or its and also will be understood that simultaneously and fall within the scope of protection of the present invention.For example, corresponding preferred channels processing unit alternative pack can be set in centralized base station, be used for initiate Radio Link is selected optimum channel bank, thereby the resource optimization of finishing in this centralized base station distributes.Understand easily, this preferred channels processing unit alternative pack can be realized by various known functional modules, and it for example can be arranged among the MU shown in Fig. 2 10, also can be arranged on the centralized base station outside, or the like.
Though described each technical scheme of the present invention above in conjunction with specific embodiments, those skilled in the art understand, and under the prerequisite that does not deviate from principle of the present invention and spirit, can also make various improvement or distortion to the present invention.In a word, protection scope of the present invention is only determined by appended claims.
Claims (30)
1, a kind of method that is used for carrying out channel resource allocation in the centralized base station of wireless communication system comprises step:
Be respectively each initiate Radio Link and select the preferred channels processing unit, so that the Channel Processing relevant with each initiate Radio Link all carried out in selected corresponding preferred channels processing unit respectively;
Wherein, described step for each initiate Radio Link selection preferred channels processing unit in the access procedure comprises following substep:
For each channel bank in the centralized base station, the sub-district that this centralized base station is controlled all is divided into corresponding one group and has other set of cells of different resource distribution stage;
Resource allocation level according to the set of cells of being divided is selected the preferred channels processing unit for each initiate Radio Link from high to low, preferentially in the high set of cells of resource allocation level, select, when only in the high set of cells of resource allocation level, can not find optimum channel bank, just in the lower set of cells of resource allocation level, select the channel bank of described optimum successively.
2, channel resource allocation method as claimed in claim 1 also comprises step:
According to access procedure in the relevant parameter of each described initiate Radio Link, utilize system's known resource model information to quantize the resource occupation amount of described each initiate Radio Link, and to come based on the resource occupation amount of described each the initiate Radio Link that quantizes to obtain be that each initiate Radio Link is selected preferred channels processing unit.
3, channel resource allocation method as claimed in claim 1, wherein:
Described be that each initiate Radio Link is selected in the step of preferred channels processing unit, make that the Radio Link corresponding district of being responsible for handling with each selected preferred channels processing unit is adjacent as far as possible geographically and concentrate on certain zone.
4, as each described channel resource allocation method among the claim 1-3, wherein:
Other set of cells of different resource distribution stage of dividing for each channel bank comprises: basic sub-district, candidate cell and residue sub-district, wherein, each sub-district one fixes on one and only in the basic set of cells of a channel bank, and the basic set of cells of all channel banks occur simultaneously for the sky union be whole sub-districts under this centralized base station, for each sub-district in each basic set of cells, the channel bank under it is the home channel processing unit of this sub-district; Sub-district in the candidate set of each channel bank is the adjacent geographically peripheral cell in sub-district in the basic set of cells of this channel bank; The residue set of cells is other affiliated subdistrict set of this centralized base station except that basic sub-district and candidate cell, and, according to giving resource allocation level from height to low order for described basic sub-district, candidate cell and the residue sub-district of each channel bank.
5, channel resource allocation method as claimed in claim 4, wherein:
Described resource allocation level according to the set of cells of being divided is selected the step of preferred channels processing unit for each initiate Radio Link from high to low and is comprised following substep:
Receive the message of new adding Radio Link when the base station after, utilize system's known resource model information to quantize the resource occupation amount of this Radio Link, and search the sub-district and the respective remote radio frequency unit RRU signal at this Radio Link place;
Judge whether the home channel processing unit of described sub-district can put forward enough required resource for this Radio Link, if its home channel processing unit can not provide resource requirement, then search the channel bank that all candidate cell set comprise this sub-district, Radio Link place, judge successively that by available resources size order from high to low can corresponding channel bank provide required resource for this Radio Link then, if these all channel banks still can not provide resource needed, then judge successively by available resources size order from high to low whether other channel bank can be for this Radio Link provides required resource, so that be that described initiate Radio Link obtains the preferred channels processing unit.
6, channel resource allocation method as claimed in claim 5, wherein:
As long as in each time of described resource allocation step judged, find the preferred channels processing unit that satisfies resource requirement then to stop follow-up judgement, if in this resource allocation step, can not find the preferred channels processing unit that satisfies the demands, then return Radio Link and set up or increase failed message and point out that failure cause is that to handle resource not enough to the base station controller/radio network controller BSC/RNC of described centralized base station correspondence; And
After described resource allocation step obtains to satisfy the preferred channels processing unit of resource requirement, whether the long-distance radio frequency unit RRU wireless signal of judging this sub-district, Radio Link place has been routed to this preferred channels processing unit, if route then is not routed to this channel bank with this RRU wireless signal as yet, be this wireless link distribution and dispose corresponding channel processing resource then, upgrade the statistical information of respective channel processing unit resource situation simultaneously, and return the message that Radio Link is set up or increase is successful to BSC/RNC.
7, as each described channel resource allocation method in the claim 1 to 3, wherein:
Described preferred channels processing unit can comprise chip-level processing unit resource, symbol level processing unit resource, RRU wireless signal channel resource for the resource that corresponding new adding Radio Link provides.
8, channel resource allocation method as claimed in claim 2, wherein, employed parameter comprises speed, type of service and the radio link parameter of each initiate Radio Link in the step of the resource occupation amount of each new adding Radio Link of described quantification.
9, channel resource allocation method as claimed in claim 8, wherein, described radio link parameter comprises that the described initiate Radio Link of expression is the type parameter of the Radio Link that increases of grand diversity or newly-built Radio Link.
10, channel resource allocation method as claimed in claim 4, wherein:
Be that initiate Radio Link is when selecting the preferred channels processing unit in described resource allocation step, when existing a plurality of candidate cell set to comprise the channel bank of this sub-district, Radio Link place and required processing resource can both be provided, then select the minimum channel bank of load as described preferred channels processing unit, thereby realize each channel bank load balancing.
11, a kind ofly be used for carrying out adaptive resource scheduling and load balancing method in the centralized base station of wireless communication system, the method comprising the steps of:
According to statistics to the load condition of each channel bank in the described centralized base station, the parameter relevant with the load sharing of each channel bank in the Adjustment System resource model information adaptively is so that realize the adaptive resource scheduling and the load balancing of each channel bank;
Also comprise step:
Be based upon the determined resource occupation amount of each initiate Radio Link, be respectively described each initiate Radio Link and select the preferred channels processing unit, so that the Channel Processing relevant with each initiate Radio Link all carried out in selected corresponding preferred channels processing unit respectively.
12, adaptive resource scheduling as claimed in claim 11 and load balancing method, wherein:
The Radio Link corresponding district of being responsible for handling with the preferred channels processing unit of selecting for each initiate Radio Link is adjacent as far as possible geographically and concentrate on certain zone.
13, adaptive resource scheduling as claimed in claim 11 and load balancing method, wherein:
For each channel bank in the centralized base station, the sub-district that this centralized base station is controlled all is divided into corresponding one group of other set of cells of different resource distribution stage;
Resource allocation level according to the set of cells of being divided is selected the preferred channels processing unit for each initiate Radio Link from high to low.
14, adaptive resource scheduling as claimed in claim 13 and load balancing method, wherein:
Other set of cells of different resource distribution stage of dividing for each channel bank comprises: basic sub-district, candidate cell and residue sub-district, wherein,
Basic sub-district is unique to each channel bank, and the basic set of cells of all channel banks occur simultaneously for the sky union be whole sub-districts under this centralized base station, for each sub-district in each basic set of cells, channel bank under it is the home channel processing unit of this sub-district, sub-district in the candidate set of each channel bank is the adjacent geographically peripheral cell in sub-district in the basic set of cells of this channel bank, the residue set of cells is other affiliated subdistrict set of this centralized base station except that basic sub-district and candidate cell, and, according to from height to low order be the described basic sub-district of each channel bank, resource allocation level is given in candidate cell and residue sub-district.
15, as each described adaptive resource scheduling and load balancing method among the claim 11-14, wherein:
The step of the parameter relevant with the load sharing of each channel bank comprises substep in the described resource model of the Adjustment System adaptively information:
Load and certain predetermined value of certain channel bank are compared; And
According to comparative result the parameter relevant with load sharing of described channel bank carried out the self adaptation adjustment.
16, adaptive resource scheduling as claimed in claim 15 and load balancing method, wherein:
Described predetermined value is by at least a the obtaining in the following manner: the instantaneous load situation of each channel bank in the centralized base station is added up the average load amount that obtains each channel bank in the certain hour scope, and will be by resulting average load amount being carried out the total average load amount of all channel banks that arithmetic average obtains as described predetermined value; Total weighted average load that will be by resulting average load amount being weighted all channel banks that handle to obtain is as described predetermined value; The function aP+b of the average load amount that all channel banks are total is as described predetermined value, a wherein, and b is a constant, P is the total average load amounts of all channel banks.
17, adaptive resource scheduling as claimed in claim 15 and load balancing method, wherein:
The parameter relevant with the load sharing of described channel bank is the size of the respective cell set of each described channel bank.
18, adaptive resource scheduling as claimed in claim 15 and load balancing method, wherein:
If the load of channel bank greater than described predetermined value, then suitably increases the candidate set of the adjacent channel processing unit of this channel bank, simultaneously, suitably reduce the candidate set of this channel bank.
19, adaptive resource scheduling as claimed in claim 18 and load balancing method, wherein:
When sub-district that the load of channel bank is increased during greater than described predetermined value for the sub-district geography in the basic set of cells of this channel bank and the candidate set corresponding adjacent channel processing unit on adjacent sub-district.
20, adaptive resource scheduling as claimed in claim 18 and load balancing method, wherein:
The adjacent channel processing unit candidate set of this channel bank increases during greater than this predetermined value how much depends on described adjacent channel processing unit load separately when the load of channel bank, the adjacent channel processing unit candidate set that load is bigger increases less, and the less adjacent channel processing unit candidate set of load increases more.
21, adaptive resource scheduling as claimed in claim 18 and load balancing method, wherein:
When the amount that suitably reduces of the load of the channel bank candidate set of this channel bank during greater than this predetermined value depends on the load of its each adjacent channel processing unit, if the load of its certain adjacent channel processing unit is bigger, the sub-district that belongs to the basic set of cells of this adjacent channel processing unit of then reducing in its candidate set is less, if the load of its certain adjacent channel processing unit is less, the sub-district that belongs to the basic set of cells of this adjacent channel processing unit of then reducing in its candidate set is more.
22, adaptive resource scheduling as claimed in claim 15 and load balancing method, wherein:
When the load of described channel bank during less than this predetermined value, suitably increase the candidate set of this channel bank, simultaneously, suitably reduce the candidate set of the adjacent channel processing unit of this channel bank.
23, adaptive resource scheduling as claimed in claim 22 and load balancing method, wherein:
When the recruitment of the load of the channel bank candidate set of this channel bank during less than this predetermined value depends on the load of its each adjacent channel processing unit, if the load of its certain adjacent channel processing unit is bigger, the sub-district that belongs to the basic set of cells of this adjacent channel processing unit that then increases in its candidate set is more, if the load of its certain adjacent channel processing unit is less, the sub-district that belongs to the basic set of cells of this adjacent channel processing unit that then increases in its candidate set is less.
24, adaptive resource scheduling as claimed in claim 22 and load balancing method is characterized in that:
When what of the decrease of the load of the channel bank candidate set of the adjacent channel processing unit of this channel bank during less than this predetermined value are also depended on the load of each adjacent channel processing unit, the candidate set of the adjacent channel processing unit that load is bigger reduces more, and the candidate set of the adjacent channel processing unit that load is less reduces less.
25, a kind of centralized collection station comprises:
Center channel is handled master unit MU (10);
A plurality of long-distance radio frequency unit RRU (20), it links to each other by broadband transmission link or network and center channel processing master unit MU couples;
Wherein, described centralized base station also comprises
The preferred channels alternative pack is used to be respectively each initiate Radio Link and selects the preferred channels processing unit, so that the Channel Processing relevant with each initiate fiber links all carried out in selected corresponding preferred channels processing unit respectively;
Wherein, described preferred channels alternative pack comprises:
Set of cells is divided subassembly, is used for each channel bank to centralized base station, and the sub-district that this centralized base station is controlled all is divided into corresponding one group and has other set of cells of different resource distribution stage; With
Channel chooser parts, be used for selecting the preferred channels processing unit for each initiate Radio Link from high to low according to the resource allocation level of the set of cells of being divided, preferentially in the high set of cells of resource allocation level, select, when only in the high set of cells of resource allocation level, can not find the channel bank of described optimum, just in the lower set of cells of resource allocation level, select the channel bank of described optimum successively.
26, centralized base station as claimed in claim 25, wherein:
Described preferred channels alternative pack is configured to select the preferred channels processing unit for each initiate Radio Link according to the resource occupation amount of described each the initiate Radio Link that utilizes system's known resource model information to quantize.
27, centralized base station as claimed in claim 25, wherein:
Described preferred channels alternative pack is configured to make that the Radio Link corresponding district of being responsible for handling with each selected preferred channels processing unit is adjacent as far as possible geographically and concentrates on certain zone.
28, as each described centralized base station among the claim 25-27, wherein:
Other set of cells of different resource distribution stage of dividing for each channel bank comprises: basic sub-district, candidate cell and residue sub-district, wherein, basic sub-district is unique to each channel bank, and the basic set of cells of all channel banks occur simultaneously for the sky union be whole sub-districts under this centralized base station, for each sub-district in each basic set of cells, the channel bank under it is the home channel processing unit of this sub-district; Sub-district in the candidate set of each channel bank is the adjacent geographically peripheral cell in sub-district in the basic set of cells of this channel bank; The residue set of cells is other affiliated subdistrict set of this centralized base station except that basic sub-district and candidate cell, and, according to giving resource allocation level from height to low order for described basic sub-district, candidate cell and the residue sub-district of each channel bank.
29, centralized base station as claimed in claim 28, wherein:
Described channel chooser parts are configured for:
Judge with the home channel processing unit of the corresponding sub-district of initiate Radio Link and whether can put forward enough required resource for this Radio Link, if its home channel processing unit can not provide resource requirement, then search the channel bank that all candidate cell set comprise this sub-district, Radio Link place, judge successively that by available resources size order from high to low can corresponding channel bank provide required resource for this Radio Link then, if these all channel banks still can not provide resource needed, then judge successively by available resources size order from high to low whether other channel bank can be for this Radio Link provides required resource, so that be that described initiate Radio Link obtains the preferred channels processing unit.
30, centralized base station as claimed in claim 29, wherein:
Described channel chooser parts are further configured to become to be used for:
As long as in each time of described resource allocation judged, find the preferred channels processing unit that satisfies resource requirement then to stop follow-up judgement, if in this resource allocation process, can not find the preferred channels processing unit that satisfies the demands, then return Radio Link and set up or increase failed message and point out that failure cause is that to handle resource not enough to the base station controller/radio network controller BSC/RNC of described centralized base station correspondence; And
After described resource allocation process obtains to satisfy the preferred channels processing unit of resource requirement, whether the long-distance radio frequency unit RRU wireless signal of judging this sub-district, Radio Link place has been routed to this preferred channels processing unit, if route then is not routed to this channel bank with this RRU wireless signal as yet, be this wireless link distribution and dispose corresponding channel processing resource then, upgrade the statistical information of respective channel processing unit resource situation simultaneously, and return the message that Radio Link is set up or increase is successful to BSC/RNC.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2004/000623 WO2005122610A1 (en) | 2004-06-10 | 2004-06-10 | A method of allocating the centralized bs resource and routing signal |
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| CN1957630A CN1957630A (en) | 2007-05-02 |
| CN100551154C true CN100551154C (en) | 2009-10-14 |
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| JP2009164912A (en) * | 2008-01-07 | 2009-07-23 | Nec Corp | Base station device and method of controlling the same |
| CN101932142B (en) * | 2009-06-19 | 2015-04-01 | 中兴通讯股份有限公司 | User interface data uplink/downlink transmission methods of time division BTS (Base Transceiver Station) for IP access |
| CN104581825A (en) * | 2013-10-18 | 2015-04-29 | 中兴通讯股份有限公司 | Resource status acquisition method, device and system |
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| JPH1023497A (en) * | 1996-06-13 | 1998-01-23 | At & T Corp | Cellular radio telephone system utilizing centralized base station |
| SE522834C2 (en) * | 1998-11-11 | 2004-03-09 | Ericsson Telefon Ab L M | Device, system and method related to radio communication |
| SE515898C2 (en) * | 1999-05-21 | 2001-10-22 | Ericsson Telefon Ab L M | A method for cell load distribution in a cellular mobile radio communication system |
| US6353600B1 (en) * | 2000-04-29 | 2002-03-05 | Lgc Wireless, Inc. | Dynamic sectorization in a CDMA cellular system employing centralized base-station architecture |
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- 2004-06-10 WO PCT/CN2004/000623 patent/WO2005122610A1/en active Application Filing
- 2004-06-10 JP JP2007526163A patent/JP4510888B2/en not_active Expired - Fee Related
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1073561A (en) * | 1991-10-03 | 1993-06-23 | 艾利森电话股份有限公司 | Guided retries for signal strength control in mobile radiotelephone systems |
| CN1092234A (en) * | 1992-10-02 | 1994-09-14 | L.M埃利克逊电话股份有限公司 | Communication Channel Selection in Cellular Radio Communication Systems |
| US5758287A (en) * | 1994-05-20 | 1998-05-26 | Airtouch Communications, Inc. | Hub and remote cellular telephone system |
| WO2001084865A1 (en) * | 2000-04-27 | 2001-11-08 | Lgc Wireless, Inc. | Adaptive capacity management in a centralized basestation architecture |
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| JP2008502235A (en) | 2008-01-24 |
| JP4510888B2 (en) | 2010-07-28 |
| CN1957630A (en) | 2007-05-02 |
| WO2005122610A1 (en) | 2005-12-22 |
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