CN100338968C - Quick dynamic channel distribution method for time-division CDMA communication system - Google Patents
Quick dynamic channel distribution method for time-division CDMA communication system Download PDFInfo
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- CN100338968C CN100338968C CNB2004100482814A CN200410048281A CN100338968C CN 100338968 C CN100338968 C CN 100338968C CN B2004100482814 A CNB2004100482814 A CN B2004100482814A CN 200410048281 A CN200410048281 A CN 200410048281A CN 100338968 C CN100338968 C CN 100338968C
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Abstract
The present invention discloses a fast dynamic channel distributing method of time division synchronous code division multiple access communication systems, which comprises the following steps: sub-zones are divided into a plurality of area positions according to the covering angles; the arrival angle of the current mobile terminal is measured and is used for determining the area position of the mobile terminal; one of a distributable upstream time slot and a distributable downstream time slot is selected and is distributed to the mobile terminal, and channel code resources are distributed; when the time slots are selected, the distribution records of the time slots are searched; the time slots not being distributed to the area positions of UE are preferentially selected and distributed; the time slot distribution result comprising the corresponding relationship of the area position of the mobile terminal, the distributed upstream time slot and the distributed downstream time slot is recorded; when the mobile terminal leaves the area position or releases resources, the time slot distribution record at this time, is canceled. The method disperses and distributes users in the same direction to different time slots as best one can, and the method can reduce the interference at the time of UE access.
Description
Technical field
The present invention relates to a kind of communication system method for channel allocation, relate in particular to a kind of TD SDMA (TD-SCDMA) communication system method for channel allocation.
Background technology
TD-SCDMA is a TDS-CDMA system, at a time only exists the air interface one-way data to transmit.In the 3GPP standard, physical frame structure based on the TD-SCDMA standard of hanging down spreading rate is that a frame comprises two subframes, and each subframe 5ms comprises 7 business time-slots (TS:time slot) and adds two pilot time slots, wherein have only two up-downgoing transfer points, subframe structure as shown in Figure 1.
The TD-SCDMA standard has uplink downlink need not match the characteristics that frequency spectrum resource and time interval resource can the up-downgoing flexible configuration, and this development for the TD-SCDMA standard provides good stage.For the up-downgoing flexible configuration that realizes time interval resource and the dynamic assignment of channelization code resource, in the TD-SCDMA system, need to adopt dynamic channel allocation (DCA:Dynamic ChannelAssignment) technology.The DCA technology is the integrated information of utilizing in the system, and all Radio Resources in the system are implemented to distribute, managed and scheduling, to maximally utilise Radio Resource and to guarantee link and the performance of system.Adopt the DCA technology, can reduce interference, minimum channel reuse distance, thereby utilize finite wireless resources expeditiously, improve power system capacity and performance; The more important thing is, the DCA technology can adapt to preferably the 3G business needs, especially two-forty, the asymmetric Network of up-downgoing and multimedia service, therefore, the DCA technology also is the advantage place of TD-SCDMA system.The DCA technology generally comprises two aspects: the one, the time interval resource of sub-district is divided into up-downgoing two parts, and also be called DCA at a slow speed; The 2nd, the channelization code resource in the corresponding time slot is distributed to bearer service, also be called quick DCA.
The TD-SCDMA system has also introduced the advanced communication technology such as smart antenna, joint-detection and uplink synchronous.Especially intelligent antenna technology, the beam shaping function of smart antenna can spatially be distinguished the signal of different user, thereby has reduced inter-user interference effectively.
In time division duplex (TDD) system, if do not adopt smart antenna, concerning a user, other signal power except that useful signal in the same time slot all is interference and the noise that influences its communication quality; Adopted after the wave beam forming, the interference that only comes from main lobe and big secondary lobe direction just can bring influence to subscriber signal.The wave beam forming of smart antenna has reduced inter-user interference effectively, its essence is the signal of different user is spatially distinguished.
In the TD-SCDMA system, when adopting smart antenna and wave beam forming, can UE be distinguished on space angle come by measuring the access angle (AOA) of different UEs.Therefore at present, AOA is mainly used in positioning service, is not used in time slot allocation, and the UE of direction and angle may be assigned with identical time slot, and the interference ratio between a plurality of like this UE is bigger, has influenced the raising of systematic function.
Summary of the invention
The technical problem to be solved in the present invention provides the quick dynamic channel assignment method of a kind of TD-SCDMA communication system, can be assigned to the user on the equidirectional in the different time-gap as far as possible.
For solving the problems of the technologies described above, technical scheme of the present invention provides the quick dynamic channel assignment method of TD-SCDMA communication system, and it comprises the steps:
Further, the quick dynamic channel assignment method of above-mentioned TD-SCDMA communication system can have following characteristics: the angle that each regional location covered of dividing in the described step 1 equals the space pass band width of smart antenna.
Further, the quick dynamic channel assignment method of above-mentioned TD-SCDMA communication system can have following characteristics: also comprise after the described step 2 and measure each time slot interference to determine the priority of each time slot, disturb little priority big; In the described step 3, if assignable up or/and there are a plurality of time slots that are not assigned in this position, portable terminal region in the descending time slot, select its medium priority the highest distribute to this portable terminal.
Further, the quick dynamic channel assignment method of above-mentioned TD-SCDMA communication system can have following characteristics: the measured parameter of described mensuration time slot interference is an Interference Signal Code Power.
Further, the quick dynamic channel assignment method of above-mentioned TD-SCDMA communication system can have following characteristics:
Described step 3 can be realized by following steps:
(1). select the time slot of limit priority;
(2). search the assignment record of current time slots, judge whether this time slot has been distributed in the position, current mobile terminal region, if execution in step (3) if not, is distributed this time slot;
(3). judge whether this time slot is the time slot of lowest priority, otherwise select time high priority, execution in step (2) is that the time slot of then assigned highest priority is given this portable terminal then, and the time slot allocation that perhaps will be assigned to this position, portable terminal region least number of times is given this portable terminal.
Perhaps, described step 3 can also be realized by following steps:
(1). according to the time slot allocation record of this this position of location lookup, portable terminal region, judgement can distribute whether also have the unallocated time slot of giving in this position, portable terminal region in the time slot, and execution in step (2) is not execution in step (3);
(2). will be assigned to this position, portable terminal region least number of times time slot, perhaps the time slot allocation that priority is the highest is given this portable terminal;
(3). the time slot that the time slot medium priority that distributes all not to be assigned with is the highest is given this portable terminal.
Further, the quick dynamic channel assignment method of above-mentioned TD-SCDMA communication system can have following characteristics: in the described step 4, the result of record also comprises and ascending time slot that is assigned with and descending time slot corresponding mobile terminal sign.
Further, the quick dynamic channel assignment method of above-mentioned TD-SCDMA communication system can have following characteristics: in the described step 3, if assignable time slot all has been assigned in this position, portable terminal region, then is chosen in the time slot allocation that is assigned with least number of times in this position, portable terminal region and gives this portable terminal.
Compared with prior art, the present invention is used for the realization of DCA technology on the spatial domain with the AOA measurement result of smart antenna, spatially distinguish by signal different user, and the user on the equidirectional is assigned in the different time-gap as far as possible, make the user distribution in same time slot on different directions, can make the user on the different directions distribute identical time slot, and this will make power system capacity greatly increase.Further can be according to the interfering signal power (ISCP:Interference Signal Code Power) of the different time-gap that measures, assignable time slot is carried out prioritization, the preferential access disturbed little time slot, give full play to the sky branch effect of smart antenna, multiple access is disturbed reduce to minimum, reasonably realize quick dynamic channel allocation (DCA), the multi-user who reduces in the sub-district inserts interference (MAI), thereby improves the resource utilization of this sub-district.
Description of drawings
Fig. 1 is the frame structure schematic diagram of prior art TD-SCDMA system.
Fig. 2 is the basic flow sheet of first embodiment of the invention.
Fig. 3 is the particular flow sheet of first embodiment of the invention step 4.
Fig. 4 is the schematic diagram that first embodiment of the invention UE inserts situation and channel allocation result.
Embodiment
The present invention, according to the arrival angle (AOA) of the portable terminal (UE:User Equipment) that measures, spatially distinguishes the signal of different user position, zoning territory, sub-district and numbering according to the space pass band width of smart antenna again.Fast DCA just can be assigned to the user on the equidirectional in the different time-gap when carrying out channel resource allocation as far as possible, makes user distribution in same time slot on different directions, thereby makes inter-user interference reduce to minimum.Present embodiment is further according to the Interference Signal Code Power (ISCP:Interference SignalCode Power) of the different time-gap that measures, assignable time slot is carried out prioritization, the preferential access disturbed little time slot, the interference when inserting with further reduction UE.
Fig. 2 is the basic flow sheet of first embodiment of the invention, and it comprises the steps:
The sub-district may be omni cell or sector cell, and the sub-district angle of coverage can be unified to be expressed as
N is the sector number, n=1, and 2,3, Pass band width is W (under the situation of using smart antenna, the space pass band width of smart antenna approximately is 40 °), then regional location number between cell null
Correspondingly, regional location No is set to 0,1 ... N-1, so No has indicated corresponding angle of coverage: No → [No * W, (No.+1) * W-1 °] respectively.
The sub-district of present embodiment is an omni cell, and the sub-district angle of coverage is 360 °, and the space pass band width of smart antenna is 40 °, and the regional location number is 9, and Position Number is 0～8.
Wherein, the ISCP of ascending time slot measures by the public-measurement of Node B (base station), and the periodic report measurement result; The ISCP of descending time slot measures and the periodic report measurement result by UE.Present embodiment supposition ascending time slot priority orders is always TS2, TS1 from high to low, the descending time slot priority orders is always TS4, TS3, TS6, TS5 from high to low, and does not consider for the distributed time slot priority variation that may cause behind each DCA fast.
Suppose current insert altogether 8 UE (UE-1, UE-2, UE-3, UE-4, UE-5, UE-6, UE-7, UE-8, wherein the label of UE is represented the time order and function of UE access network from small to large), determine that according to the access angle of each UE that measures the regional location number at its place and sub-district angle of coverage are as shown in table 1:
Table 1
| Angle of | 0～ 39° | 40～ 79° | 80～ 119° | 120～ 159° | 160～ 199° | 200～ 239° | 240～ 279° | 280～ 319° | 320～ 359° |
| Sub-district No. | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| The UE sign | UE-1、 UE-2、 UE-4、 UE-7、 UE-8 | - | - | - | - | UE-6 | UE-5 | - | UE-3 |
Wherein the time slot search method is: at first select the time slot of high priority, if this time slot then selected in the record that this time slot has not distributed in this regional location number; If this time slot has had the record that is assigned with in this regional location number, promptly this time slot has distributed the UE in the same area location number, then select the time slot of time high priority to proceed to judge selection, up to choosing a time slot or searching the minimum time slot of priority, still do not choose a time slot if search the minimum time slot of priority, then select the time slot of limit priority.
Wherein the concrete deterministic process of time slot allocation is finished by following steps as shown in Figure 3:
Step 401: search assignable uplink and downlink time slot priority orders, obtain the uplink and downlink time slot of current limit priority;
Step 402: search the time slot allocation record, judge whether current ascending time slot has been distributed in this UE region location number, if, execution in step 403, if not, execution in step 406;
Step 403: judge whether this time slot is the time slot of lowest priority, is execution in step 404, not execution in step 405;
Step 404: distribute five-star time slot, execution in step 407 then;
Step 405: select time high priority, execution in step 402 then;
Step 406: distribute this time slot;
More than finished the distribution of ascending time slot, will begin the assigning process of descending time slot below, the current descending time slot of this moment is the descending time slot of the limit priority that obtains in the step 401:
Step 407: search the assignment record of this descending time slot, judge whether current descending time slot has been distributed in the location number of current UE region, if, execution in step 408, if not, execution in step 411;
Step 408: judge whether this time slot is the time slot of lowest priority, is execution in step 409, not execution in step 410;
Step 409: the time slot of assigned highest priority, finish.
Step 410: select time high priority, execution in step 407 then;
Step 411: distribute this time slot, finish.
Finish the distribution of whole uplink and downlink time slots.
After below will specifically introducing above-mentioned 8 UE access, carry out the process that descending time slot distributes according to the method for the described time slot allocation of step 401-411, for convenience of description, suppose that UE-1 inserts before, all time slots are all unallocated, and the UE in this process in the regional location number does not leave or discharges resource.
When UE-1 inserts, according to measuring AOA, obtain it and belong to regional location No=0, basis can be distributed the assignment record that the priority of time slot is searched this time slot from high to low one by one again, give this regional location because limit priority time slot TS4 is unallocated, thereby be TS4 to the descending time slot of its distribution, in the mapping relations table of record UE sign, regional location number, the uplink and downlink time slot that distributes, increase the time slot allocation record of this DCA then;
When UE-2 inserts, according to measuring AOA, obtain No=0, inquire about the record of time slot allocation again, find that the time slot TS4 of limit priority distributes, then distribute time high priority time slot TS3 and record;
When UE-3 inserts, according to measuring AOA, obtain No=8, inquire about the record of time slot allocation again, according to time slot allocation priority assignment TS4, and record;
When UE-4 inserts, according to AOA, obtain No=0, inquire about the record of time slot allocation again, find that time slot TS4 and TS3 distribute, according to time slot allocation priority, distribute time slot TS6, and record;
When UE-5 inserts, according to AOA, distribute time slot TS4, and record;
When UE-6 inserts, in like manner distribute time slot TS4, and record;
When UE-7 inserts, according to AOA, obtain No=0, inquire about the record of time slot allocation again, find that time slot TS4, TS3, TS6 distribute, according to time slot allocation priority, distribute the time slot TS5 of lowest priority, and record;
When the 8th UE (UE-8) inserts, according to AOA, obtain No=0, inquire about the record of time slot allocation again, send out and can distribute that the time slot of lowest priority all distributes in the time slot, the then time slot TS4 of assigned highest priority, and record;
The distribution method of ascending time slot TS1, TS2 is identical with the distribution method of descending time slot, and described 8 UE are through above-mentioned channel allocation, and its uplink and downlink time slot allocation result is referring to table 2 and Fig. 4:
Table 2
| On/descending time slot | Regional location area code No. | ||||||||
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | |
| TS1 | UE-2、 | - | - | - | - | - | - | - | - |
| TS2 | UE-1、 UE-4、 UE-7、 UE-8 | - | - | - | - | UE-6 | UE-5 | - | UE-3 |
| TS4 | UE-1、 UE-8 | - | - | - | - | UE-6 | UE-5 | - | UE-3 |
| TS3 | UE-2 | - | - | - | - | - | - | - | - |
| TS6 | UE-4 | - | - | - | - | - | - | - | - |
| TS5 | UE-7 | - | - | - | - | - | - | - | - |
In the mapping relations table of the uplink and downlink time slot that writes down UE, Location Area Identity, distribution, write down the time slot allocation result of this UE.After described 8 the UE channel allocation of present embodiment, the mapping relations table of uplink and downlink timeslot is as shown in table 3:
Table 3
| The UE sign | UE-1 | UE-2 | UE-3 | UE-4 | UE-5 | UE-6 | UE-7 | UE-8 |
| Location Area Identity No. | 0 | 0 | 8 | 0 | 6 | 5 | 0 | 0 |
| The ascending time slot that is distributed | TS2 | TS1 | TS2 | TS2 | TS2 | TS2 | TS2 | TS2 |
| The descending time slot that is distributed | TS4 | TS3 | TS4 | TS6 | TS4 | TS4 | TS5 | TS4 |
In sum, the quick DCA method of the embodiment of the invention, having taken all factors into consideration the priority and the position of UE on the spatial domain of time slot allocation divides, the different UEs of same lane place is assigned on the different time slots as far as possible, has reduced the interference between a plurality of UE, and amount of calculation is little simultaneously, be easy to realize, reached when a plurality of UE insert in the sub-district and reduced the purpose that multiple access disturbs, improved the performance of network, made power system capacity increase at double.
Can also do various conversion on the basis of the foregoing description, for example: first embodiment of the invention step 404 and 409 can also change into: the time slot allocation of selecting to distribute to this position, UE region least number of times is given this UE.After adopting this method of salary distribution, the ascending time slot TS2 in the table 2 will distribute to UE-1, UE-4, UE-8, and no longer the same with the embodiment UE-7 that distributes to, TS2 can distribute to UE-7.Handle like this to need to calculate respectively and can distribute time slot allocation to give the number of times of this position, UE region, but the UE distributed time slot that is positioned at the same area position is disperseed as far as possible, reduce mutual interference.
And for example, when distributing time slot, the priority that also can not divide time slot according to time slot ISCP.When selecting time slot, priority allocation is unallocated gives the time slot of this position, UE region, if exist a plurality of unallocated time slots or time slot all to distribute, can adopt at random or the selective sequential of other setting one of them, so also can solve as far as possible the user on the equidirectional is assigned to technical problem in the different time-gap.
And for example, embodiment distributes after judging one by one from high in the end by the priority orders that can distribute time slot, except that this kind method, can also be according to the time slot allocation record of UE region this regional location of location lookup, judgement can distribute whether also have the unallocated time slot of giving in this position, UE region in the time slot, be to distribute the highest time slot of all time slot medium priorities that were not assigned with to give this UE, will not be assigned to this position, UE region least number of times time slot, perhaps the time slot allocation that priority is the highest is given this UE.
The present invention also is applicable to time-division duplex (TDD-SCDMA) communication system.
Claims (8)
1, the quick dynamic channel assignment method of a kind of TD-SCDMA communication system is characterized in that also comprising the steps:
Step 1 is divided into several number of positions zone with the sub-district by angle of coverage;
Step 2 is measured the arrival angle of current mobile terminal, determines the regional location at this portable terminal place according to it;
Step 3 respectively selects an ascending time slot and a descending time slot to distribute to this portable terminal and assigns channelization codes resource from assignable uplink and downlink time slot, when selecting time slot, search the assignment record of time slot, the time slot that preferential selection is not assigned to this position, UE region distributes;
Step 4 writes down the result of this time slot allocation, has comprised the regional location at this portable terminal place and the ascending time slot of distribution, the corresponding relation of descending time slot;
When step 5 is left this regional location or discharged resource when this portable terminal, nullify the record of this time slot allocation.
2, the quick dynamic channel assignment method of TD-SCDMA communication system as claimed in claim 1 is characterized in that: the angle that each regional location covered of dividing in the described step 1 is determined according to the space pass band width of smart antenna.
3, the quick dynamic channel assignment method of TD-SCDMA communication system as claimed in claim 1 is characterized in that:
Also comprise step after the described step 2: measure each time slot interference to determine the priority of each time slot, disturb little priority big;
In the described step 3, if assignable up or/and there are a plurality of time slots that are not assigned in this position, portable terminal region in the descending time slot, select its medium priority the highest distribute to this portable terminal.
4, the quick dynamic channel assignment method of TD-SCDMA communication system as claimed in claim 3 is characterized in that: the measured parameter of described mensuration time slot interference is an Interference Signal Code Power.
5, the quick dynamic channel assignment method of TD-SCDMA communication system as claimed in claim 3 is characterized in that described step 3 further comprises:
(1) time slot of selection limit priority;
(2) search the assignment record of current time slots, judge whether this time slot has been distributed in the position, current mobile terminal region, if execution in step (3) if not, is distributed this time slot;
(3) judge whether this time slot is the time slot of lowest priority, otherwise select time high priority, execution in step (2) is that the time slot of then assigned highest priority is given this portable terminal then, and the time slot allocation that perhaps will be assigned to this position, portable terminal region least number of times is given this portable terminal.
6, the quick dynamic channel assignment method of TD-SCDMA communication system as claimed in claim 3 is characterized in that described step 3 further comprises:
(1) according to the time slot allocation record of this this position of location lookup, portable terminal region, judgement can distribute whether also have the unallocated time slot of giving in this position, portable terminal region in the time slot, and execution in step (2) is not execution in step (3);
(2) will be assigned to this position, portable terminal region least number of times time slot, perhaps the time slot allocation that priority is the highest is given this portable terminal;
(3) time slot that the time slot medium priority that distributes all not to be assigned with is the highest is given this portable terminal.
7, the quick dynamic channel assignment method of TD-SCDMA communication system as claimed in claim 1 is characterized in that: in the described step 4, the result of record also comprises and ascending time slot that is assigned with and descending time slot corresponding mobile terminal sign.
8, the quick dynamic channel assignment method of TD-SCDMA communication system as claimed in claim 1, it is characterized in that in the described step 3, if assignable time slot all has been assigned in this position, portable terminal region, then is chosen in the time slot allocation that is assigned with least number of times in this position, portable terminal region and gives this portable terminal.
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| CN101720130B (en) * | 2008-10-09 | 2012-10-03 | 电信科学技术研究院 | Method and device for allocating physical resource blocks |
| CN101729163B (en) * | 2008-10-20 | 2013-05-15 | 电信科学技术研究院 | Method and equipment for determining interference source of mobile communication |
| CN101765164B (en) * | 2008-12-23 | 2012-06-06 | 中兴通讯股份有限公司 | Downlink resource allocation method for multi-carrier time division duplex system |
| CN102088774A (en) * | 2009-12-02 | 2011-06-08 | 大唐移动通信设备有限公司 | Dynamic channel allocating method and communication system |
| CN102281574B (en) * | 2010-06-11 | 2014-02-12 | 电信科学技术研究院 | Method for determining cell of carrying out interference coordination and wireless network controller |
| CN103441785B (en) * | 2013-07-25 | 2017-05-24 | 北京邮电大学 | System and method for multi-antenna channel environment simulation based on full-silencing dark room |
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| US5838673A (en) * | 1993-12-16 | 1998-11-17 | Geotek Industries, Inc. | Radio telephone system for minimizing co-channel interference utilizing geographic separation of signals and transmission power control |
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