CN101170831A - Channel allocation method in time division synchronization code division multi-address access system - Google Patents
Channel allocation method in time division synchronization code division multi-address access system Download PDFInfo
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- CN101170831A CN101170831A CNA2007101878193A CN200710187819A CN101170831A CN 101170831 A CN101170831 A CN 101170831A CN A2007101878193 A CNA2007101878193 A CN A2007101878193A CN 200710187819 A CN200710187819 A CN 200710187819A CN 101170831 A CN101170831 A CN 101170831A
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Abstract
The invention discloses a channel distribution method in time division synchronization code division multiple access switch-in system. The steps include: acquire UE capability and judgment conditions set in RNC; when the UE capability meets the judgment conditions, obtain the carrier frequency priority according to DCA algorithm and perform channel distribution on each carrier frequency according to the carrier frequency priority. The invention overcomes the shortcoming of resources waste caused by traditional channel distribution method in channel distribution, introduces limited UE capability consideration in traditional DCA algorithm framework, avoids the code resources waste phenomena caused by inefficient UE capability and saves precious code resources in TD-CDMA system greatly.
Description
Technical field
The present invention relates to a kind of mobile communication technology, particularly, relate to a kind of TD SDMA and insert method for channel allocation in (TD-SCDMA) system.
Background technology
In the 3-G (Generation Three mobile communication system) of TD SDMA (TD-SCDMA), channel refers to the combination of one group of carrier frequency/channel code.Specifically, on the carrier frequency of each appointment, per 10 milliseconds is a radio frames, and each radio frames is divided into two subframes again, and the structure of these two subframes is identical, is divided into 7 conventional time slots and 3 special time slots in each subframe again.User's business datum all is carried on the conventional time slot, carries out the differentiation of physical channel by OVSF (Orthogonal Variable Spreading Factor OVSF) sign indicating number again on these 7 conventional time slots, so be also referred to as the orthogonal channel sign indicating number.
When each private subscribers inserted, its business datum all needed radio network controller (RNC) to carry for its allocation of channel resources may.Traditional method for channel allocation is, residue code resource capacity based on carrier frequency, perhaps DCA (dynamic channel allocation) algorithm based on power, interference level obtains carrier frequency priority and time slot priority, carries out channel allocation from high to low successively by carrier frequency priority then and attempts.No matter be the residue code resource capacity of carrier frequency or the power of carrier frequency, interference level, all belong to system-level attribute, therefore this distribution method is that the foothold that stands in systematic function is considered, in most of the cases can utilize system's present situation preferably, for the user obtains higher QoS (service quality).
Yet because this distribution method can not fully take into account the capability problems for the treatment of service UE (subscriber equipment), at some in particular cases, distribution result may can cause damage to the performance of total system on the contrary.Typical example is, when there is deficiency in the UE ability, according to this wasting phenomenon that may cause resource based on the method for channel allocation of DCA.Such as, certain UE ability is only supported the user of up solid size, the business of application 32Kbps needs 5 BRU (basic resource unit).According to traditional distribution method, can in a time slot, be its code channel that distributes a SF (spreading factor)=2 during uplink assignment, the result who does like this is to have caused the wasting of resources of 3 BRU.If can assign to 2 ascending time slots to it, the code channel of a SF=4 of a time slot allocation, the code channel of a SF=16 of a time slot allocation then can not cause the phenomenon of the wasting of resources.
Summary of the invention
Technical problem solved by the invention provides the method for channel allocation in a kind of TD-SCDMA system, the drawback of the wasting of resources that has been caused when having overcome conventional channel distribution method allocated channel.
Technical scheme is as follows:
Method for channel allocation in a kind of TD-SCDMA system, step comprises:
(1) judgment condition of obtaining the UE ability and in RNC, being provided with;
(2) when described UE ability satisfies described judgment condition, obtain carrier frequency priority, and on each carrier frequency, carry out channel allocation successively according to described carrier frequency priority according to the DCA algorithm.
Further, in the step (1), the content of described judgment condition comprises: up of UE support maximum code channel number that solid size, the descending every time slot of UE support less than 16 or the maximum code channel number supported of the descending every subframe of UE less than 16 times descending time slot number.
Further, in the step (1), in described judgment condition, be set in the UE up direction and carry out the subsequent communication channel distribution, perhaps be set in the UE down direction and carry out subsequent communication channel and distribute, perhaps all set and carry out subsequent communication channel and distribute at UE up direction and UE down direction.
Further, in the step (2), on each carrier frequency,, carry out channel allocation successively at each time slot according to the time slot priority that DCA obtains; When each time slot carried out channel allocation, the number of resources of this time slot allocation satisfied the UE ability and is no more than current permission application number of resources.
Further, in the step (2), described current permission application number of resources is meant that the number of resources deduction of total application applied for successful number of resources at other time slots, adds the number of resources result that waste number of resources threshold value is drawn, and counts both with this time slot surplus resources then and gets smaller value; Described waste number of resources threshold value is meant the upper limit of the number of resources that each time slot can be wasted.
Further, in the step (2), determine the direction of channel allocation, on described direction, carry out channel allocation; Described direction comprises UE up direction or UE down direction.
Further, in the step (2), when described UE ability does not satisfy described judgment condition, release subsequent communication channel and distribute, use conventional method to carry out channel allocation.
Further, in the step (1), described judgment condition is provided with in radio network controller.
The drawback of the wasting of resources that the present invention has been caused when having overcome conventional channel distribution method allocated channel, under the framework of traditional DCA algorithm, introduced the Consideration of UE limited ability, avoid the generation of the sign indicating number wasting of resources phenomenon that causes because of the UE scarce capacity, greatly saved the sign indicating number resource of TD-SCDMA system preciousness.
Description of drawings
Fig. 1 is the flow chart of the inventive method.
Embodiment
The present invention by obtaining the UE ability, and carries out the distribution of channel according to the UE ability under the framework of traditional DCA algorithm, avoided the sign indicating number wasting of resources phenomenon that causes because of the UE scarce capacity.
With reference to the accompanying drawings, the preferred embodiments of the present invention are done detailed description.
With reference to shown in Figure 1, the process of allocated channel of the present invention is as follows:
Step S101: obtain the UE ability.
The UE ability has comprised the tenability information of UE to each aspect of Radio Access Network, comprises PDCP (bag data compression protocol) ability, RLC (radio link protocol) ability, RF (radio frequency) ability, physical channel ability or the like.UE ability is herein refered in particular to the physical channel ability of UE.
Step S102: obtain the judgment condition that in RNC, is provided with.
Among the present invention, at the content that the UE ability is comprised, be provided with a judgment condition that starts the allocated channel process, this judgment condition is provided with in radio network controller (RNC).In judgment condition, can be set in the UE up direction and carry out the control of this method for channel allocation, also can be set in the control that the UE down direction carries out this method for channel allocation, also can all set the control of carrying out this method for channel allocation at UE up direction and UE down direction.
The judgment condition content can comprise with the next item down or several:
Up of A, UE support solid size.
The maximum code channel number that the descending every time slot of B, UE is supported is less than 16.
The maximum code channel number that the descending every subframe of C, UE is supported is less than 16 times descending time slot number (16* descending time slot number).
This set has taken into full account several because the scene of the UE wasting of resources that scarce capacity produces like this, has been avoided the random triggering of channel allocation among the present invention under normal circumstances, causes the impact to normal channel allocation.
Step S103: judge whether the UE ability of obtaining satisfies the judgment condition that is provided with.
By judging whether the UE ability satisfies judgment condition and start the subsequent communication channel assigning process, if the UE ability of obtaining satisfies the judgment condition that is provided with, execution in step S104; Otherwise, withdraw from, still carry out channel allocation by conventional method.
Step S104: the direction of determining channel allocation.
Direction comprises UE up direction and UE down direction, up or the UE down direction for UE, can only upwards implement subsequent communication channel at corresponding folk prescription distributes, such as, the descending ability of UE to be accessed is complete, but up of UE supports solid size, so can be only carries out channel allocation among the present invention at up direction.
Step S105: obtain waste number of resources threshold value is set in RNC.
The waste number of resources is meant the difference between the number of resources of the number of resources of actual application and desire application, wastes the upper limit that the number of resources threshold value is meant the number of resources that each time slot can be wasted.
Step S106: obtain carrier frequency priority according to the DCA algorithm, on each carrier frequency, carry out channel allocation successively according to carrier frequency priority.
Further, the time slot priority that obtains according to DCA on each carrier frequency is carried out channel allocation successively at each time slot.Wherein, when each time slot carried out channel allocation, the number of resources of this time slot allocation was for satisfying the UE ability and being no more than current permission application number of resources, and concrete implication is as follows:
(1) number of resources of this time slot allocation must satisfy the UE ability;
(2) current permission application number of resources is meant, the number of resources deduction of total application has been applied for successful number of resources at other time slots, adds the number of resources result that waste number of resources threshold value is drawn, and counts both with this time slot surplus resources then and gets smaller value;
(3) be no more than current permission application number of resources and be meant, the number of resources that in the number of resources of this time slot application needs smaller or equal to (2), calculates.
Step S107: judge whether whole resources are allocated successfully.
If all resource allocation successes, then the channel allocation among the present invention is finished; Otherwise, withdraw from this method, still use conventional method to carry out channel allocation.
When each time slot carried out channel allocation successively, the number of resources of time slot allocation was for satisfying the UE ability and being no more than current permission application number of resources.
If the resource of professional application all is allocated successfully, then flow process finishes; Otherwise withdraw from, still distribute by conventional method.
Below by two examples, the present invention will be further described.
Example one
1, sets in advance judgment condition.
The judgment condition of startup is set on radio network controller (RNC), and the judgment condition content comprises:
Up of I, UE support the maximum code channel number of solid size, the descending every time slot support of UE less than 16.
II, the required ascending resource number of (2) this business are 26 BRU, and the downlink resource number is 28 BRU, the up support solid size of this UE, and the maximum code channel number of the descending every time slot support of UE is 10.
The waste resource thresholding of III, radio network controller setting is 4.
Ascending time slot priority on the highest carrier frequency of IV, the priority that obtains according to DCA is: 3,2,1, and descending time slot priority is: 1,2,3, ascending time slot, descending time slot are configuration in 3: 3.Ascending time slot residue BRU is: 16,16,8, and descending time slot residue BRU is: 0,16,16 (suppose that remaining code channel is continuous on each time slot, do not have the fragment situation).
2, carry out channel allocation.
(1) UE goes up in the UE ability of judge finding to obtain, there is deficiency the provisional capital under the UE, meets 2 contents in the judgment condition of setting, and judgment condition satisfies, flow startup, and subsequent communication channel to be distributed in UE up and UE is descending uses simultaneously, enter (2);
(2), carry out up channel at each ascending time slot successively and distribute according to ascending time slot priority:
A, 1 free time of time slot, can apply for 1 code channel of SF=1;
B, 16 BRU of time slot 2 residues, this moment, every time slot allowed the number of resources of application to be: MIN{ (26-16+4), 16}=14.Therefore, on time slot 2, satisfying the UE ability of supporting solid size and be no more than under the prerequisite of 14 BRU, the maximum resource number that can apply for is 8 BRU;
C, on time slot 3,26-16-8=2 remaining BRU of application again.
Up channel has assigned.
(3), carry out down channel at each descending time slot successively and distribute according to descending time slot priority.
I, 6 free time of time slot, the resource (16 BRU) that can apply for whole time slot;
Ii, 16 BRU of time slot 5 residues, this moment, every time slot allowed the number of resources of application to be: MIN{ (28-16+4), 16}=16 BRU.Therefore, on time slot 5, be 10 UE ability at the maximum code channel number that satisfies every time slot support, and be no more than under the prerequisite of 16 BRU that can apply for the code channel of 1 SF=1, the number of resources of acquisition is 16 BRU.
To apply for that just in time number of resources assigns, the channel allocation success.
Example two
1, sets in advance judgment condition.
The judgment condition of the startup that is provided with at radio network controller (RNC) comprises following 3 contents:
Up of I, UE support solid size, and the maximum code channel number that the descending every time slot of UE is supported is less than 16, and the maximum code channel number that the descending every subframe of UE is supported is less than 16* descending time slot number.
II, the required ascending resource number of this business are 16 BRU, and the downlink resource number is 32 BRU, and the maximum code channel number of the descending every subframe support of this UE is 30, and other UE abilities are complete.
The waste resource thresholding of III, radio network controller setting is 4.
Ascending time slot priority on the highest carrier frequency of IV, the priority that obtains according to DCA is: 3,2,1, and descending time slot priority is: 1,2,3, the uplink and downlink time slot is configuration in 3: 3.Ascending time slot residue BRU is: 16,16,8, and descending time slot residue BRU is: 10,12,14 (suppose that remaining code channel is continuous on each time slot, do not have the fragment situation).
2, carry out channel allocation.
(1) judge to find that the uplink UE ability of obtaining is complete, descending ability has deficiency, and (the maximum code channel number 30＜16*3) that every subframe is supported meets 1 content in the judgment condition of setting, judgment condition satisfies, flow startup, and this method enters 2 only in descending application);
(2) uply still distribute by conventional method; After being allocated successfully, enter 3);
(3), carry out down channel at each descending time slot successively and distribute according to descending time slot priority.
The content of carrying out channel allocation at descending time slot comprises:
14 residue BRU are arranged on i, the time slot 6, apply for 14 code channel successes;
Ii, time slot 6 have been applied for 14 BRU, also need apply for (32-14)=18 BRU; Owing to applied for 14 code channels on the time slot 6, therefore every subframe can also be supported (30-14)=16 code channel again; The number of resources that this moment, every time slot allowed to apply for is MIN{ (32-14+4), 12}=12 BRU.Therefore, on time slot 5, be 16 and be no more than under the prerequisite of 12 BRU, can apply for the code channel of 12 SF=16 at the maximum code channel number that satisfies support this moment; The number of resources that obtains is 12 BRU;
Iii, time slot 6 and time slot 5 SEPARATE APPLICATION 14 and 12 BRU, also need apply for (32-14-12)=6 BRU; And every subframe can also be supported (30-14-12)=4 code channel again; The number of resources that this moment, every time slot allowed to apply for is MIN{ (32-14-12+4), 10}=10 BRU.And the code channel of 4 SF=16 can't satisfy the demand of 6 BRU, and 10 BRU have limited the code channel that can't apply for 1 SF=1 again, therefore can only apply for failure this moment, withdraws from this method, and descending use conventional method attempts distributing once more.
Claims (8)
1. the method for channel allocation in the TD-SCDMA system, step comprises:
(1) judgment condition of obtaining the UE ability and in RNC, being provided with;
(2) when described UE ability satisfies described judgment condition, obtain carrier frequency priority, and on each carrier frequency, carry out channel allocation successively according to described carrier frequency priority according to the DCA algorithm.
2. the method for channel allocation in the TD-SCDMA system according to claim 1, it is characterized in that, in the step (1), the content of described judgment condition comprises: up of UE support maximum code channel number that solid size, the descending every time slot of UE support less than 16 or the maximum code channel number supported of the descending every subframe of UE less than 16 times descending time slot number.
3. the method for channel allocation in the TD-SCDMA system according to claim 1, it is characterized in that, in the step (1), in described judgment condition, be set in the UE up direction and carry out the subsequent communication channel distribution, perhaps be set in the UE down direction and carry out subsequent communication channel and distribute, perhaps all set and carry out subsequent communication channel and distribute at UE up direction and UE down direction.
4. the method for channel allocation in the TD-SCDMA system according to claim 1 is characterized in that, in the step (2), on each carrier frequency, according to the time slot priority that DCA obtains, carries out channel allocation successively at each time slot; When each time slot carried out channel allocation, the number of resources of this time slot allocation satisfied the UE ability and is no more than current permission application number of resources.
5. the method for channel allocation in the TD-SCDMA system according to claim 4, it is characterized in that, in the step (2), described current permission application number of resources is meant that the number of resources deduction of total application applied for successful number of resources at other time slots, add the number of resources result that waste number of resources threshold value is drawn, count both with this time slot surplus resources then and get smaller value; Described waste number of resources threshold value is meant the upper limit of the number of resources that each time slot can be wasted.
6. the method for channel allocation in the TD-SCDMA system according to claim 1 is characterized in that, in the step (2), determines the direction of channel allocation, carries out channel allocation on described direction; Described direction comprises UE up direction or UE down direction.
7. the method for channel allocation in the TD-SCDMA system according to claim 1, it is characterized in that, in the step (2), when described UE ability does not satisfy described judgment condition, the release subsequent communication channel is distributed, and uses conventional method to carry out channel allocation.
8. the method for channel allocation in the TD-SCDMA system according to claim 1 is characterized in that, in the step (1), described judgment condition is provided with in radio network controller.
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| CN2007101878193A CN101170831B (en) | 2007-11-13 | 2007-11-13 | Channel allocation method in time division synchronization code division multi-address access system |
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| CN2007101878193A CN101170831B (en) | 2007-11-13 | 2007-11-13 | Channel allocation method in time division synchronization code division multi-address access system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009135431A1 (en) * | 2008-05-04 | 2009-11-12 | 大唐移动通信设备有限公司 | Method, system and equipment for notifying user’s information |
| CN102448172A (en) * | 2010-10-08 | 2012-05-09 | 中兴通讯股份有限公司 | A-DPCH (Accompanying-Dedicated Physical Channel) allocation method and device on basis of A-DPCH frame division multiplexing |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1138435C (en) * | 1999-07-16 | 2004-02-11 | 华为技术有限公司 | Dynamic distribution method of channels in cellular mobile communcation system |
| CN100456870C (en) * | 2006-08-15 | 2009-01-28 | 中国移动通信集团公司 | Wireless channel distribution method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009135431A1 (en) * | 2008-05-04 | 2009-11-12 | 大唐移动通信设备有限公司 | Method, system and equipment for notifying user’s information |
| CN101572864B (en) * | 2008-05-04 | 2011-09-21 | 电信科学技术研究院 | Method, system and device for notifying user information |
| US8588140B2 (en) | 2008-05-04 | 2013-11-19 | China Academy Of Telecommunications Technology | User information notifying method, system and apparatus |
| CN102448172A (en) * | 2010-10-08 | 2012-05-09 | 中兴通讯股份有限公司 | A-DPCH (Accompanying-Dedicated Physical Channel) allocation method and device on basis of A-DPCH frame division multiplexing |
| CN102448172B (en) * | 2010-10-08 | 2015-04-01 | 中兴通讯股份有限公司 | A-DPCH (Accompanying-Dedicated Physical Channel) allocation method and device on basis of A-DPCH frame division multiplexing |
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