CN1787678A - Method for dynamic channel allocation of multi carrier time division duplex communication system - Google Patents
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Abstract
This invention discloses a dynamic channel distributing method for a multi-carrier time division duplex communication system including 1, assigning ratio of the time slot of up and down line in advance, 2, regulating the ratio to match the up and down line transmission ability with the load of service when the asymmetry change exceeds the preset sphere, which matches the resource volume with the service volume of the up and down lines by this ratio regulation method to avoid that the resource is one-way limited resulted from asymmetrical service volume of them so as to utilize system resources fully.
Description
Technical field
The present invention relates to the dynamic channel assignment method of TDD (time division duplex) communication system, relate in particular to the dynamic channel assignment method of multi-carrier-wave TDD communication system.
Background technology
The dynamic channel allocation main task is to carry out the resource allocation of each minizone.Usually according to the variation of the service asymmetry of each sub-district, in each sub-district, distribute and adjustment uplink and downlink timeslot resource, be complementary with the up-downgoing transmittability that reaches time slot and the ratio relation of professional up-downgoing load, and then obtain the effect of best spectrum efficiency.
In the TDD mobile communication system, same carrier frequency is adopted in uplink and downlink, and system mainly satisfies the requirement of asymmetric traffic amount by the ratio of adjusting uplink and downlink timeslot, if the uplink and downlink timeslot ratio of neighbor cell can cause the generation of cross time-slot when inconsistent.Cross time-slot is meant that on same carrier frequency a sub-district is in up (or descending) and is in the time slot of descending (or up) at the same carrier frequency of its neighbor cell.Have influence on the capacity and the performance of whole system because uplink and downlink timeslot is divided the inconsistent cross time-slot interference problem of bringing between homogeneous frequency adjacent area, and can bring difficulty to system group network.
For this reason, Huawei Tech Co., Ltd to have proposed application number in calendar year 2001 January 18 to State Intellectual Property Office be 01102259.0 patent application document.Disclosed dynamic channel assignment method is in this application file: determine whether to distribute cross time-slot code channel group according to travelling carriage to the distance of this cell base station, promptly by forbidding distributing cross time slot resource at cell edge, thereby reduce the interference of cross time-slot.
In addition, Langxun Technology Ltd is also to disclose a kind of interference that utilizes intelligent antenna technology to suppress cross time-slot in 00136498.7 at application number.
Except above-mentioned two kinds be the dynamic channel assignment method of purpose to reduce cross interference, the time slot dynamic allocation method that also has other in the prior art, such as: according to the measurement of signal interference and traffic carrying capacity, ask for the slot allocation method of optimizing in power system capacity by artificial neural network algorithm.
But above-mentioned dynamic channel assignment method all is to carry out Resources allocation at single-carrier system, does not consider multicarrier system.And for single-carrier system, the resource of distribution mainly is time slot and code channel.Because the cross time-slot interference effect of homogeneous frequency adjacent area is more serious, when type of service is complicated, carrying out time slot ratio adjustment effect is not clearly, therefore existing system generally adopts uplink and downlink timeslot ratio fixed allocation, but because diversity of operations and changeability, cause easily at the resource shortage of a direction and another direction also has the situation of resource free time, therefore cause resource utilization not high.
In addition, the dynamic channel allocation schemes that existing single-carrier system proposes in order to solve the cross time-slot interference is more complicated mostly, computing capability and computational speed to system have proposed quite high requirement, therefore on using, engineering can not guarantee the requirement of real-time communication, and often have higher equipment cost, thereby greatly reduce the practicality of these class methods.
Along with the growth of number of users, when increasing the wireless traffic density that produces, user speech and data surpass single-carrier cell when the following capacity density that can provide of prerequisite that covers is provided, and the use multicarrier just becomes a kind of effective cell capacity-enlarging approach.But, a kind of dynamic channel assignment method at multi carrier time division duplex communication system is not proposed in the prior art.
Summary of the invention
The present invention provides a kind of dynamic channel assignment method of suitable multicarrier system on the basis of the dynamic channel assignment method of existing single-carrier system, to make resource utilization ratio be improved by dynamic adjustment time slot allocation.
For addressing the above problem, the invention discloses a kind of dynamic channel assignment method of multi carrier time division duplex communication system, comprising:
(1) allocates the uplink and downlink timeslot ratio of each carrier wave of each sub-district in advance;
(2) when the variation of service asymmetry in the sub-district exceeds predefined scope, adjust the uplink and downlink timeslot ratio of cell carrier, make the up-downgoing transmittability of sub-district time slot and the ratio relation of this Zone up-downgoing load be complementary.
Predefined scope described in the step (2) is for satisfying | P-Q|＞M1 condition; Wherein, P is the ratio of current downlink traffic in sub-district and upstream traffic, Q is the ratio of current downlink resource in sub-district and ascending resource, M1 is first threshold value, described ascending resource is the up-link capacity sum of all carrier waves in the sub-district, and described downlink resource is the downlink capacity sum of all carrier waves in the sub-district.
The described predefined scope of step (2) also comprises: satisfy L＞M2 condition, wherein, L is the current total business volume in sub-district, and M2 is second threshold value.
Step (1) also comprises: according to resource utilization the first thresholding table is set, the described first thresholding table is preserved each ratio and pairing first threshold value of the ratio of all up-downgoing resources of this sub-district;
Step (2) also comprises: according to the ratio of the up-downgoing resource of the current employing in sub-district, search the described first thresholding table, obtain to answer first threshold value.
Step (2) is specially: (21) judge L＞M2 and | whether P-Q|＞M1 sets up, if, then carry out step (22), otherwise, finish; (22) transmission direction of one or more time slots in the counter-rotating sub-district.
Step (22) specifically comprises:
(a) determine to change the carrier wave at transmission direction time slot and this time slot place;
(b) existing all users in the time slot of determining in the step (a) are adjusted to other time slots earlier, then with described time slot counter-rotating transmission direction.
Choose the time slot on the time slot transfer point limit described in the step (a).
The carrier wave of determining described time slot place in the step (a) comprises: it is consistent with the time slot allocation of the carrier wave of the peripheral cell of the same frequency of employing to make described carrier wave carry out time slot counter-rotating back.
The present invention also comprises: according to the time slot allocation ratio of each carrier wave of system, determine that described carrier wave corresponding service up-downgoing data rate compares scope; When the user asked to insert, the up-downgoing data rate ratio according to described user was dispensed to described user on the carrier wave that is complementary with it.
Step (1) is according to the traffic carrying capacity of whole sub-district, professional asymmetric degree are predicted the uplink and downlink timeslot ratio that distributes each carrier wave at system's initial operating stage.
Compared with prior art, the present invention has the following advantages:
First, the present invention's service asymmetry in the sub-district exceeds predefined scope, absolute value as the difference of resource asymmetry in service asymmetry and the current area exceeds predefined scope, just triggering cell uplink and downlink timeslot ratio is adjusted, and described scope is to set according to the resource utilization of system, in the time of can guaranteeing channel allocation thus, resource has higher utilance, simultaneously, avoid because the asymmetric resource that causes of up-downgoing traffic carrying capacity is unidirectional limited as far as possible, make when dynamic channel allocation, can make full use of system resource and improve power system capacity;
Second, when predefined scope adopts the absolute value of the difference of condition: P and Q to exceed first threshold value, ratio according to the up-downgoing resource of concrete distribution is determined the first corresponding threshold value, adapts to various up-downgoing resource allocation conditions thus, improves the accuracy of distributing;
The 3rd, the present invention adopts the transmission direction of conversion time slot when adjusting the uplink and downlink timeslot ratio of carrier wave.And when the carrier wave of selecting the travel direction conversion and time slot, the criterion of selection is to make this carrier wave the time slot allocation with the carrier wave of the same frequency of peripheral cell is consistent after conversion as far as possible, avoids the generation of cross time-slot thus;
The 4th, the present invention is in advance according to the time slot allocation ratio of cell carrier, determine that corresponding service up-downgoing data rate compares scope, the carrier wave that can mate than selection according to user's up-downgoing data rate when the user inserts, up-downgoing stock number and up-downgoing traffic carrying capacity are complementary as far as possible, avoid reaching thus and making full use of the purpose that system resource inserts the user fast because the asymmetric resource that causes of up-downgoing traffic carrying capacity is unidirectional limited.
Description of drawings
Fig. 1 is the flow chart for the dynamic channel assignment method of multi-carrier-wave TDD communication system of the present invention;
Fig. 2 is a kind of realization flow figure of step S120 among Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, specify the present invention.
In the dynamic channel allocation process, the up-downgoing capacity allocation ratio of sub-district and this sub-district up-downgoing traffic carrying capacity ratio are identical more, and the capacitance loss of system is more little, reach best spectrum efficiency thus.For this reason, in channel allocation, need adjust the up-downgoing capacity according to the up-downgoing traffic carrying capacity.
Because single-carrier system has only time slot to adjust, so the ratio of the up-link capacity of system and downlink capacity is the ratio of ascending time slot and descending time slot.Still is example with the TD-SCDMA system, considers that a communication subframe has only 6 business time-slots can carry out the distribution of time slot up and down, therefore in a subframe, the division of up-link capacity and downlink capacity ratio only is following several: 1: 5, and 2: 4,3: 3,4: 2,5: 1.
But, owing in multicarrier system, have carrier wave and time slot bidimensional resource to adjust, so the division ratio granularity of up-link capacity and downlink capacity ratio can be littler.Still be example with the TD-SCDMA system, suppose three carrier waves of a sub-district support, a subframe can have 18 business time-slots can carry out the division of uplink and downlink timeslot.The division of up-link capacity and downlink capacity ratio can have following several 3: 15,4: 14......14: 4,15 in a subframe: 3, and therefore, multicarrier system can reach than single-carrier system supports changeable asymmetric traffic better.
See also Fig. 1, it is the flow chart of the dynamic channel assignment method of multi-carrier-wave TDD communication system of the present invention.It may further comprise the steps:
At first carry out step S110: the uplink and downlink timeslot ratio of allocating each carrier wave of each sub-district in advance.
When the network planning, the engineering staff estimates this address service feature, distributes the uplink and downlink timeslot ratio of each carrier wave of each sub-district then according to the service feature after estimating.Described service feature comprises the asymmetric degree of the asymmetric degree of the traffic carrying capacity of sub-district, all kinds of business in sub-district and the ratio of all kinds of business.
System can distribute the up-link capacity of whole sub-district and the ratio of downlink capacity according to the asymmetric degree of the traffic carrying capacity of sub-district.If cell uplink traffic carrying capacity of estimating and downlink traffic are about equally, then the pre-assigned ascending time slot of system is identical with the ratio relation of descending time slot, have the asymmetry of up-downgoing traffic carrying capacity otherwise cell uplink traffic carrying capacity of estimating and downlink traffic are unequal, system distributes the up-downgoing resource according to the asymmetry ratio of up-downgoing traffic carrying capacity.Still support that with a sub-district three carrier waves are example, suppose that upstream traffic and the downlink traffic estimated are about 2: 1, then the ascending time slot number of each subframe and descending time slot number can be divided into 12: 6.
The number that system can also distribute the uplink and downlink timeslot of each carrier wave according to the ratio of the asymmetric degree of all kinds of business in sub-district and all kinds of business.Such as, business comprises voice service, the asymmetric data service of up-downgoing, the data service of one-way transmission.And the ratio of all kinds of business is approximately 1: 1: 1.Then system can implement meticulousr differentiation to a plurality of carrier waves of sub-district.The ratio of supposing the TD-SCDMA sub-district up-downgoing capacity of three carrier waves is 1: 1, then the ratio of the uplink and downlink timeslot of first carrier wave can be divided into 3: 3, the ratio of the uplink and downlink timeslot of second carrier wave was divided into 1: 5, the ratio of the uplink and downlink timeslot of the 3rd carrier wave was divided into 5: 1, so just can transmit various symmetries and asymmetric traffic on different carrier waves.Insert up-downgoing speed on first carrier wave and be the voice service of 12.2K, and on other two carrier waves, insert the asymmetric data service of the descending 128K of up 32K respectively.Above-mentioned this division more helps supporting asymmetric traffic, and more effective reduction is disturbed with frequency, cross time-slot.
Carry out step S120 then: when service asymmetry exceeds predefined scope in the sub-district, adjust the uplink and downlink timeslot ratio of cell carrier, make the up-downgoing transmittability of sub-district time slot and the ratio relation of this Zone up-downgoing load be complementary, and then obtain preferable spectrum efficiency.
Predefined scope is set according to this local resource utilance.The variation that takes place when service asymmetry in the sub-district drops in the described scope, and the applicant thinks that then described variation allows, and only exceeds described scope, just triggers the adjustment of carrier wave uplink and downlink timeslot ratio.
Preestablish scope in the present invention with two example explanations, but not limited thereto.
First embodiment
When the sub-district current business satisfies | P-Q|＞M1 condition just triggers the uplink and downlink timeslot adjustment of carrier wave; Wherein, P is the ratio of current downlink traffic in sub-district and upstream traffic, Q is the ratio of current downlink resource in sub-district and ascending resource, M1 is first threshold value, described ascending resource is the ascending time slot sum of all carrier waves of sub-district in the subframe, and described downlink resource is the descending time slot sum of all carrier waves of sub-district in the subframe.The first threshold value M1 is that the utilance according to this local resource is provided with, and passes through condition | P-Q|＞M1 judges whether to carry out the adjustment of uplink and downlink timeslot ratio, to improve usage factor of system resource.
And, in step S120, except Rule of judgment | P-Q|＞M1, can also consider another condition: L1＞M2.Wherein, L is the current total business volume in sub-district, and M2 is second threshold value, and the current business total amount is sub-district current business amount and downlink traffic sum.In addition, when step S120, also can only consider whether to satisfy L1＞M2.But, if triggering the traffic carrying capacity of also considering current area when time slot ratio is adjusted, avoided then that the traffic carrying capacity of current area is less also carries out the situation that time slot ratio adjusts and take place, promptly trigger consideration situation that time slot ratio adjusts more comprehensively.Because the traffic carrying capacity of current area hour, system resource is enough, even professional asymmetric, still can insert.In addition, second threshold value is set according to the sub-district concrete condition usually.
Have a plurality of sub-districts in the TD-SCDMA communication system, the professional dissymmetry factor P of each sub-district can change along with the time.P can be the ratio of current area upstream traffic and current area downlink traffic, also can be the ratio of current area downlink traffic and current area upstream traffic.In the present embodiment, P is the ratio of current area downlink traffic and current area upstream traffic.On the sub-district/downlink traffic be in each carrier wave of sub-district on/the downlink traffic sum.
Each sub-district also is provided with local resource dissymmetry factor Q, and in the present embodiment, Q is the cell downlink capacity C
DowWith the cell uplink capacity C
UpRatio.
If the current business amount is less, need the upstream traffic that receives less than cell uplink capacity and the downlink traffic that needs to send less than the cell downlink capacity, then the sub-district need not to trigger the adjustment of time slot ratio.But, in the real cell environment, often take place in the sub-district requested resource number will be much larger than the sub-district assignable number of resources.And if P＞Q, a new service request will be blocked owing to the shortage of downlink resource.Thereby the ascending resource amount of using is C
DowSo n/P is C
Up-(C
Down/ P) ascending resource has been wasted, and the resource utilization u of whole sub-district is:
Suppose that there are 3 carrier waves this sub-district, up-link capacity is 10 in the subframe, and downlink capacity is 8, and Q=0.8 then supposes that current upstream traffic is 10, downlink traffic also is 10.P=1 then, P＞Q obviously, service request is owing to the shortage of downlink resource is blocked.Thereby the downlink resource amount of using is 8, and the resource of up use should be 8/P=8, so lost 2.
In the same manner, will be much larger than the sub-district when assignable number of resources and P＜Q when requested resource number in the sub-district, a new service request will be blocked owing to the shortage of ascending resource, and the downlink resource amount of using is C
Up* P, all C
Down-C
UpThe downlink resource of * P has been wasted, and the resource utilization of whole sub-district is:
For a TD-SCDMA communication system, the carrier wave number n of each sub-district is determined, can list the ratio of all possible downlink capacity in this sub-district and up-link capacity thus, obtains all local resource dissymmetry factor Q.With a Q is that example illustrates how to obtain pairing first threshold value of described Q.
At first determine C
DownAnd C
Up, obviously when P=Q, resource utilization u maximum.Determine then to preestablish when requiring when resource utilization u reaches, the scope at P place, definite thus | the threshold value of P-Q|, i.e. first threshold value.
Still adopting 3 carrier waves with a sub-district is example, the ratio of subframe medium and small district ascending resource and downlink resource can have 3: 15,4: 14......15: 3, corresponding each ratio, calculating is in the scope of the resource utilization u that system can accept, the maximum difference of P and Q (being aforementioned described first threshold value), and it preservation become the first thresholding table.
When the Zone asymmetry changes, according to the ascending time slot of the current employing in sub-district and the ratio of descending time slot, search the first thresholding table, obtain the first corresponding threshold value, whether the difference of calculating P and Q has then surpassed described first threshold value, if then carry out sub-district uplink and downlink timeslot ratio adjustment.
Second embodiment
Can serve as the uplink and downlink timeslot ratio of considering object adjustment cell carrier with a carrier wave in step S120, also can be the uplink and downlink timeslot ratio of considering object adjustment cell carrier with a time slot of carrier wave.Below serve as to consider how completing steps S120 (seeing also Fig. 2) of object description with a time slot.
At first carry out step S210: when the service asymmetry of sub-district changes, judge whether the variation of service asymmetry in the sub-district exceeds the scope of preestablishing, if then carry out step S220, otherwise withdraw from;
Step S220: adjust the wherein transmission direction of a time slot of carrier wave, and carry out step S210.
Usually choose time slot on the time slot transfer point limit among the step S210 as the time slot of needs conversions transmission direction, and before conversion direction, the user on the time slot earlier to be reversed adjusts on the time slot of other time slots or other carrier waves.Such as decision with the transmission direction of certain time slot by up convert to descending, at this moment need the up direction user who will exist on present this time slot to adjust to other time slots or carrier wave, having only has not had on this time slot could formally its transmission direction be changed behind the up user.
That is: when the difference of up-downgoing traffic carrying capacity ratio in the sub-district and up-downgoing stock number ratio acquires a certain degree, reverse with regard to slot transmission direction of carrier wave wherein, reconfigure the up-downgoing stock number of sub-district, avoid occurring the unidirectional limited of resource.Two kinds of strategies are arranged again when choosing the carrier wave of time slot ratio adjustment: a kind of strategy is feasible as far as possible and the time slot ratio distribution of the carrier wave of heavy traffic area peripheral cell same frequency reaches unanimity, and can reduce cross time-slot like this and disturb; Another strategy can allow the time slot allocation of different carrier inconsistent in the lighter zone of system loading with exactlying, so more helps the direct access of various asymmetric traffics and need not to trigger resource consolidation and time slot and reverse.
In addition, business comprises up-downgoing symmetrical service and up-downgoing asymmetric traffic.Described asymmetric traffic comprises up greater than descending business and descending greater than up business.In step S110, system is provided with different uplink and downlink timeslot ratios with carrier wave, so that finish the request of different business according to the kind and the professional shared proportion of business.
User's up-downgoing data rate can reflect professional up-downgoing traffic carrying capacity.For this reason, before system operation, the rate corresponding type is set, the ratio range of the corresponding up-downgoing data rate of each type according to the number of carrier wave.When receiving service request from user, determine corresponding type according to the ratio of user's up-downgoing data rate, find the carrier wave that matches by described type.When allocation of carriers, preferentially described user is dispensed to described carrier wave, as far as possible having avoided the asymmetric resource that causes of up-downgoing traffic carrying capacity unidirectional limited, thereby made full use of resource, make power system capacity have a distinct increment.
Still is example with three carrier wave TD-SCDMA systems, supposes the up-downgoing business time-slot ratio of 3 carrier waves to be configured to 1: 5,2: 4 and 3: 3 by the adjustment of time slot ratio; We can be divided into 3 classes according to its up-downgoing data rate than also with the business that inserts so, and first kind business is a symmetrical service, as speech business; Second class is a time asymmetric traffic, the 3rd class is an asymmetric traffic, division boundary line for class of service, can adjust the statistics of business for a long time according to system, avoid in the sub-district the actual a certain class business of initiating seldom, and another kind of business is a lot, and it is congested to cause certain carrier wave to occur easily.
When the user makes a call, judge earlier and belong to any class business, preferentially be linked on the carrier wave of 1: 5 or 2: 4 configuration according to asymmetric degree for the asymmetric business of up-downgoing, professional priority allocation to 3 for the up-downgoing symmetry: the carrier wave of 3 configurations is linked into other carrier waves again if this carrier wave can not insert.Can reduce the unidirectional limited situation of resource like this and take place, improve resource utilization greatly.
For example when the professional arrival of a 12.2K language, it preferentially can be linked into the carrier wave of configuration in 3: 3; When a 64K downstream traffic arrives, preferentially be linked into the carrier wave of configuration in 1: 5; When the Packet Service of a descending 128K of up 64K arrives, preferentially be linked into the carrier wave of configuration in 2: 4.If professional when its prepreerence carrier wave can not insert, be linked into other carrier waves again.
More than disclosed only be several specific embodiment of the present invention, but the present invention is not limited thereto, those skilled in the art can think variation, all should drop in protection scope of the present invention.
Claims (10)
1, a kind of dynamic channel assignment method of multi carrier time division duplex communication system is characterized in that, comprising:
(1) allocates the uplink and downlink timeslot ratio of each carrier wave of each sub-district in advance;
(2) when the variation of service asymmetry in the sub-district exceeds predefined scope, adjust the uplink and downlink timeslot ratio of cell carrier, make the up-downgoing transmittability of sub-district time slot and the ratio relation of this Zone up-downgoing load be complementary.
2, the dynamic channel assignment method of multi carrier time division duplex communication system as claimed in claim 1 is characterized in that, predefined scope described in the step (2) is for satisfying | P-Q|＞M1 condition; Wherein, P is the ratio of current downlink traffic in sub-district and upstream traffic, Q is the ratio of current downlink resource in sub-district and ascending resource, M1 is first threshold value, described ascending resource is the up-link capacity sum of all carrier waves in the sub-district, and described downlink resource is the downlink capacity sum of all carrier waves in the sub-district.
3, the dynamic channel assignment method of multi carrier time division duplex communication system as claimed in claim 1 or 2 is characterized in that, the described predefined scope of step (2) also comprises: satisfy L＞M2 condition, ratio, wherein, L is the current total business volume in sub-district, and M2 is second threshold value.
4, as the dynamic channel assignment method of claim 2 or 3 described multi carrier time division duplex communication systems, it is characterized in that,
Step (1) also comprises: according to resource utilization the first thresholding table is set, the described first thresholding table is preserved each ratio and pairing first threshold value of the ratio of all up-downgoing resources of this sub-district; Step (2) also comprises: according to the ratio of the up-downgoing resource of the current employing in sub-district, search the described first thresholding table, obtain to answer first threshold value.
5, the dynamic channel assignment method of multi carrier time division duplex communication system as claimed in claim 3 is characterized in that, step (2) is specially:
(21) judge L＞M2 and | whether P-Q|＞M1 sets up, if, then carry out step (22), otherwise, finish;
(22) transmission direction of one or more time slots in the counter-rotating sub-district.
6, the dynamic channel assignment method of multi carrier time division duplex communication system as claimed in claim 5 is characterized in that, step (22) specifically comprises:
(a) determine to change the carrier wave at transmission direction time slot and this time slot place;
(b) existing all users in the time slot of determining in the step (a) are adjusted to other time slots earlier, then with described time slot counter-rotating transmission direction.
, the dynamic channel assignment method of multi carrier time division duplex communication system as claimed in claim 6, it is characterized in that, choose the time slot on the time slot transfer point limit described in the step (a).
8, as the dynamic channel assignment method of claim 6 or 7 described multi carrier time division duplex communication systems, it is characterized in that, determine in the step (a) that the carrier wave at described time slot place comprises: it is consistent with the time slot allocation of the carrier wave of the peripheral cell of the same frequency of employing to make described carrier wave carry out time slot counter-rotating back.
9, as the dynamic channel assignment method of claim 1 or 3 described multi carrier time division duplex communication systems, it is characterized in that, also comprise:
According to the time slot allocation ratio of each carrier wave of system, determine that described carrier wave corresponding service up-downgoing data rate compares scope;
When the user asked to insert, the up-downgoing data rate ratio according to described user was dispensed to described user on the carrier wave that is complementary with it.
10, as the dynamic channel assignment method of claim 1 or 3 described multi carrier time division duplex communication systems, it is characterized in that step (1) is according to the traffic carrying capacity of whole sub-district, professional asymmetric degree are predicted the uplink and downlink timeslot ratio that distributes each carrier wave at system's initial operating stage.
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