CN101742679A - Access control method in multi-channel system - Google Patents
Access control method in multi-channel system Download PDFInfo
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- CN101742679A CN101742679A CN200810227435A CN200810227435A CN101742679A CN 101742679 A CN101742679 A CN 101742679A CN 200810227435 A CN200810227435 A CN 200810227435A CN 200810227435 A CN200810227435 A CN 200810227435A CN 101742679 A CN101742679 A CN 101742679A
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Abstract
The invention discloses an access control method in a multi-channel system. The method comprises the steps that: a NodeB selects a strong channel of access UE according to a PRACH signal channel estimation, and notifies information on the strong channel to RNC; the RNC corresponds to each usable carrier, determines the number of the UE currently loaded by the carrier on the strong channel of the access UE, and selects the carrier loading the least UE currently as an access carrier of the access UE. The access control method in the multi-channel system can improve the throughput capacity of the system.
Description
Technical field
The present invention relates to the admission control technique in the wireless communication system, the admittance control method in particularly a kind of multi-channel system.
Background technology
The mechanism of permitting the entrance of present TD-SCDMA system mainly contains two kinds:
1, the priority of each carrier wave is identical, only carries out access according to factors such as ISCP, code channel resources.
2, the carrier wave priority different according to the AOA information setting of UE.
Wherein, the second way can reduce adjacent area interference.Particularly, in the TD-SCDMA system, according to intelligent antenna technology up link can the estimating user signal arrival direction AOA (Angle of Arrival).Utilize this characteristic, can the access control of TD-SCDMA be optimized:
In the UE access procedure, NodeB estimates the AOA of RACH channel, in RACH FP frame AOA information is reported RNC.
RNC adopts different frequency (or time slot) priority according to user's AOA, as Fig. 1: when AOA is in [0,120] when spending, carrier wave priority be (f1, f2, f3); When AOA is in [120,240] when spending, carrier wave priority be (f2, f3, f1); When AOA is in [240,360], carrier wave priority be (f3, f1, f2).
Utilize this mechanism of permitting the entrance, can the user that the interference of adjacent sub-district is more serious distinguish, reach the purpose that reduces system interference with different frequency.This mechanism of permitting the entrance is only effective at outdoor macro base station.
In multi-channel system, promptly utilize the different passages of smart antenna to cover different zones, the indoor overlay environment of TD-SCDMA for example, variation has also taken place in the definition of AOA, and this moment, NodeB reported being of the RNC strong channel information of UE (being the overlay area that UE is in those passages).If use above-mentioned mechanism of permitting the entrance at macro base station, final effect is that the UE that is in same passage can be assigned with identical carrier resource, thereby makes throughput of system lower.
Summary of the invention
In view of this, the invention provides the admittance control method in a kind of multi-channel system, can improve the throughput of system.
For achieving the above object, the present invention adopts following technical scheme:
Admittance control method in a kind of multi-channel system comprises:
NodeB select to insert the strong passage of UE according to the PRACH channel estimating, and information that will described strong passage is notified RNC;
Corresponding each available carrier wave of RNC is determined the UE number of this carrier wave current carrying on the strong passage that inserts UE, selects the access carrier of a minimum carrier wave of current carrying UE number as the described UE of access.
Preferably,, then determine the UE sum that these carrier waves carry on all passages, and select the access carrier of a minimum carrier wave of carrying UE sum as described access UE if the minimum carrier wave of described current carrying UE number is a plurality of.
Preferably, when being a plurality of, then in the minimum carrier wave of carrying UE sum, select a access carrier at random as the described UE of access as if the minimum carrier wave of carrying UE sum.
Preferably, when the strong passage that inserts UE was one, the UE number of described definite this carrier wave current carrying on the strong passage that inserts UE was: the UE number of determining the current carrying on this strong passage of this carrier wave.
Preferably, when the strong passage that inserts UE when being a plurality of, describedly determine that the UE number of this carrier wave current carrying on the strong passage that inserts UE is:
Determine the UE number that this carrier wave carries respectively at a plurality of strong passage that inserts UE, and select the maximum strong passage of UE number therein, this carrier wave is being inserted the UE number of current carrying on the strong passage of UE at the UE number of current carrying on the strong passage of selecting as this carrier wave.
Preferably, describedly select the strong passage of each UE to comprise according to up DPCH channel estimating:
For arbitrary UE, on each passage, choose the main footpath of a prominent footpath, and determine the maximum P of main footpath power in all passages as this passage
i Max
To lead footpath power greater than P
i MaxThe passage of-Δ is as the strong passage of described arbitrary UE, and Δ is default difference threshold.
Preferably, the mode of determining passage upper pathway power is:
Wherein, ρ is the value determined according to the channel variation speed greater than 0 and less than 1 the recurrence factor, n is a subframe numbers.
Preferably, describedly select the strong passage of each UE to comprise according to up DPCH channel estimating:
For arbitrary UE, on each passage, choose the main footpath of prominent M bar footpath as this passage, calculate on corresponding each passage all main footpaths on this passage power and, and determine all passage correspondences main footpath power and in maximum P
i Max
With the main footpath power of correspondence with greater than P
i MaxThe passage of-Δ is as the strong passage of described arbitrary UE, and Δ is default difference threshold.
Preferably, the mode of determining passage upper pathway power is:
Wherein, ρ is the value determined according to the channel variation speed greater than 0 and less than 1 the recurrence factor, n is a subframe numbers.
As seen from the above technical solution, among the present invention, NodeB select to insert the strong passage of UE according to the PRACH channel estimating, and information that will described strong passage is notified RNC; Corresponding each carrier wave of RNC is determined the UE number of this carrier wave current carrying on the strong passage that inserts UE, selects the access carrier of a minimum carrier wave of current carrying UE number as the described UE of access.Like this, the UE that can guarantee to be on the same passage uses different carrier waves as far as possible, the UE of same carrier wave is distributed on the different passages as far as possible, thereby can improves throughput of system.
Description of drawings
Fig. 1 is RNC adopts different frequency priority according to user's AOA a schematic diagram.
Fig. 2 is the particular flow sheet of the admittance control method of multi-channel system in the embodiment of the invention one.
Fig. 3 is a strong channel selecting schematic diagram in the indoor covering system.
Fig. 4 a is for having inserted strong passage and the access carrier schematic diagram of UE in the example one of the present invention.
Fig. 4 b selects the result schematic diagram of access carrier for the new UE of access in the example one of the present invention.
Fig. 5 a is for having inserted strong passage and the access carrier schematic diagram of UE in the example two of the present invention.
Fig. 5 b selects the result schematic diagram of access carrier for the new UE of access in the example two of the present invention.
Embodiment
For making purpose of the present invention, technological means and advantage clearer,, the present invention is described in further details below in conjunction with accompanying drawing.
Basic thought of the present invention is: the UE that is on the same passage uses different carrier waves as far as possible, the UE of same carrier wave is distributed on the different passages as far as possible, thereby can improves throughput of system.
The basic skills of access control comprises among the present invention: NodeB select to insert the strong passage of UE according to the PRACH channel estimating, and information that will described strong passage is notified RNC; Corresponding each carrier wave of RNC is determined the UE number of this carrier wave current carrying on the strong passage that inserts UE, selects the access carrier of a minimum carrier wave of current carrying UE number as the described UE of access.
By the admittance control method of the invention described above, make that the UE on the same passage uses different carrier waves as far as possible, thereby can improve throughput of system.
Further, according to the multichannel characteristic of the indoor covering of TD-SCDMA, can adopt empty division of HSDPA technology to improve the HSDPA cell throughout.So-called empty division of HSDPA is meant two UE of same sub-district, if be in different passages and isolation is enough high, this moment, two UE can multiplexing HS-PDSCH code channel resource.Adopt empty division of HSDPA technology can improve the cell throughout of HSDPA greatly.Adopted after the empty division of HSDPA technology,, can cause the UE that is in same passage can be assigned with identical carrier resource, so just can't utilize the space division multiplexing advantage of indoor covering if still adopt traditional mechanism of permitting the entrance of describing in the background technology.And by admittance control method of the present invention, can make in the system of sky division of HSDPA, on each passage, obtain the system gain of frequency division, like this, divide and two aspects of frequency division, thereby overall system capacity is improved fully by sky.
Below by specific embodiment explanation specific implementation of the present invention.Wherein, at first the strong passage of the UE of Que Dinging may be for one or more, and then the strong passage that inserts UE by two specific embodiments explanations is one and when a plurality of, the admittance control method that the present invention is concrete
Embodiment one:
In the present embodiment, have the situation of a strong passage, introduce admittance control method of the present invention inserting UE.
Fig. 2 is the particular flow sheet of the admittance control method of multi-channel system in the embodiment of the invention one.As shown in Figure 2, this method comprises:
Indoor covering system as shown in Figure 3, if UE only is in the overlay area of a passage, the result of strong channel selecting only can select a passage, if UE is in the common area of coverage of two passages, the result of strong channel selecting is that this UE occupies two passages simultaneously.(as spacious places such as parking lots) in some cases might exist a UE by the common situation about covering of a plurality of passages.
The mode of concrete strong channel selecting can for: NodeB can obtain the channel estimation results of each passage: h according to the channel estimating of up PRACH
1, h
2..., h
N, N is the antenna channels number, for each passage, chooses the main footpath of a prominent footpath as this passage, promptly main footpath power
Wherein, τ is a channel estimating tap time delay; In the power of the main footpath of all passages, select maximum
Then will be greater than P
i MaxAll channel selecting of-Δ (dB) are strong passage.
Perhaps, consider synchronous undesirable, the main footpath that can also be in strong channel selecting process select two or more according to the watt level of passage, corresponding strong channel selecting mode can for: NodeB can obtain the channel estimation results of each passage: h according to the channel estimating of up DPCH
1, h
2..., h
N, for each passage, choose the main footpath (N＞1) of prominent N bar footpath as this passage, corresponding each passage calculates the power and the P in all main footpaths of this passage
iMain footpath power and middle selection maximum in all passage correspondences
Then will be greater than P
i MaxAll channel selecting of-Δ (dB) are strong passage.
In above-mentioned two kinds strong channel selecting processes, all need to calculate the power in each path in the passage, can adopt existing path power computational methods.Preferably,, can carry out recursive operation to channel estimating in order to improve the precision of strong channel selecting, to obtain performance number more accurately:
RNC receives that NodeB from the strong channel information of UE that RACH FP reports, supposes:
Existing online HSDPA UE:UE1, UE2 ..., UEN, N is existing UE number;
Available HSDPA carrier wave: f1, f2 ..., fM, M are available HSDPA carrier wave, available carrier wave refers to that this carrier wave does not reach maximum number of user;
The strong channel information of existing HSDPA UE: s1, s2 ..., sN is for i UEs
i=[s
I1s
I2S
IL], L is a port number, s
Il{ 0, on behalf of i UE, 1}, 1≤i≤N, 1≤l≤L whether occupy the 1st passage to ∈;
The carrier wave g1 that online HSDPA UE is assigned with, g2 ..., gN.G wherein
i∈ { f
1, f
2..., f
M;
The new strong channel information s that inserts UE
N+1
In the present embodiment, the strong passage that newly inserts UE is one, and then the concrete operations of this step are: corresponding each available carrier wave of RNC, add up the UE number that this carrier wave carries on this strong passage.
In the UE number that each carrier wave that obtains carries, select a minimum carrier wave of carrying UE number in step 202, will insert UE and insert this carrier wave on strong passage, promptly access carrier is:
If exist a plurality of carrier waves to make the following formula minimum, then preferably, carry out following steps:
Carry the minimum carrier wave of UE in the carrier wave of selecting in the step 204, step 203 as access carrier on all passages, if still there are a plurality of carrier waves, then carrier wave of picked at random is as access carrier.
So far, the admittance control method flow process in the present embodiment finishes.
Provide a concrete example one below.The current UE that inserted is respectively UE1, UE2, UE3......UE13, and the strong channel information of these UE and access carrier information are shown in Fig. 4 a.Wherein, the numbering of the digitized representation UE in the grid.Suppose that the strong passage of determining the new UE 14 of access is a passage 2, then be: at first, determine carrier wave f for this UE determines the mode of access carrier
1, f
2And f
3The UE number that on passage 2, carries respectively, by Fig. 4 a as seen, N (f
1)=1, N (f
2)=1, N (f
3)=2.Then, in three carrier waves, be chosen in the minimum carrier wave of carrying UE number on the passage 2, be f
1And f
2At last, at f
1Be chosen in the minimum carrier wave of UE sum that carries on all 4 passages among the f2, particularly, f
1The UE that carries on 4 passages adds up to 6, f
2The UE that carries on 4 passages adds up to 5, therefore selects carrier wave f
2As the access carrier of UE 14, insert the result shown in Fig. 4 b.
Embodiment two:
In the present embodiment, have the situation of a plurality of strong passages, introduce admittance control method of the present invention inserting UE.
The particular flow sheet of the admittance control method of multi-channel system is identical with embodiment one in the embodiment of the invention two.Particularly, this method comprises:
Identical among the operation of this step and the embodiment one, just repeat no more here.
RNC receives that NodeB from the strong channel information of UE that RACH FP reports, supposes:
Existing online HSDPA UE:UE1, UE2 ..., UEN, N is existing UE number;
Available HSDPA carrier wave: f1, f2 ..., fM, M are available HSDPA carrier wave, available carrier wave refers to that this carrier wave does not reach maximum number of user;
The strong channel information of existing HSDPA UE: s1, s2 ..., sN is for i UEs
i=[s
I1s
I2S
IL], L is a port number, s
Il{ 0, on behalf of i UE, 1}, 1≤i≤N, 1≤l≤L whether occupy the 1st passage to ∈;
The carrier wave g1 that online HSDPA UE is assigned with, g2 ..., gN.G wherein
i∈ { f
1, f
2..., f
M;
The new strong channel information s that inserts UE
N+1
In the present embodiment, the new strong passage that inserts UE is a plurality of, then the concrete operations of this step are: the corresponding arbitrary available carrier wave of RNC, add up the UE number that this carrier wave carries respectively on a plurality of strong passages, and select the maximum strong passage of UE number therein, this carrier wave is being inserted the UE number of current carrying on the strong passage of UE as this carrier wave at the UE number of current carrying on the strong passage of selecting.The UE number that on this strong passage, carries.For example shown in Fig. 5 a, suppose that the strong passage that inserts UE is respectively passage 2 and passage 3, determine that then the UE number that carrier wave f2 carries is on the strong passage that inserts UE: determine that at first the UE number that carrier wave f2 carries is 2 on passage 2, the UE number of carrying is 1 on passage 3, so the UE number that carrier wave f2 carries on the strong passage that inserts UE is 2.
Step 203 selects a minimum carrier wave of the determined carrying of step 202 UE number as the access carrier that inserts UE.
In the UE number that each carrier wave that obtains carries, select a minimum carrier wave of carrying UE number in step 202, will insert UE and insert this carrier wave on strong passage, promptly access carrier is:
Wherein, N (f
i) expression carrier wave f
iThe UE number that on strong passage, carries.
If exist a plurality of carrier waves to make the following formula minimum, then preferably, carry out following steps:
Step 204 will be carried the minimum carrier wave of UE as access carrier on all passages in the carrier wave of selecting in the step 203, if still there are a plurality of carrier waves, then carrier wave of picked at random is as access carrier.
So far, the admittance control method flow process in the present embodiment finishes.
Provide a concrete example two below.The current UE that inserted is respectively UE1, UE2, UE3......UE13, and the strong channel information of these UE and access carrier information are shown in Fig. 5 a.Wherein, the numbering of the digitized representation UE in the grid.Suppose that the strong passage of determining the new UE 14 of access is a passage 2, then be: at first, determine carrier wave f for this UE determines the mode of access carrier
1, f
2And f
3The UE number that on strong passage, carries respectively, by Fig. 5 a as seen, N (f
1)=1, N (f
2)=2, N (f
3)=2.Then, in three carrier waves, be chosen in the minimum carrier wave of carrying UE number on the strong passage, be f
1Therefore select carrier wave f
1As the access carrier of UE 14, insert the result shown in Fig. 5 b.
Being preferred embodiment of the present invention only below, is not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. the admittance control method in the multi-channel system is characterized in that this method comprises:
NodeB select to insert the strong passage of UE according to the PRACH channel estimating, and information that will described strong passage is notified RNC;
Corresponding each available carrier wave of RNC is determined the UE number of this carrier wave current carrying on the strong passage that inserts UE, selects the access carrier of a minimum carrier wave of current carrying UE number as the described UE of access.
2. method according to claim 1, it is characterized in that, if the minimum carrier wave of described current carrying UE number is a plurality of, then determines the UE sum that these carrier waves carry on all passages, and select the access carrier of a minimum carrier wave of carrying UE sum as described access UE.
3. method according to claim 2 is characterized in that, when being a plurality of as if the minimum carrier wave of carrying UE sum, then selects an access carrier as the described UE of access at random in the minimum carrier wave of carrying UE sum.
4. method according to claim 1 is characterized in that, when the strong passage that inserts UE was one, the UE number of described definite this carrier wave current carrying on the strong passage that inserts UE was: the UE number of determining the current carrying on this strong passage of this carrier wave.
5. method according to claim 1 is characterized in that, when the strong passage that inserts UE when being a plurality of, describedly determines that the UE number of this carrier wave current carrying on the strong passage that inserts UE is:
Determine the UE number that this carrier wave carries respectively at a plurality of strong passage that inserts UE, and select the maximum strong passage of UE number therein, this carrier wave is being inserted the UE number of current carrying on the strong passage of UE at the UE number of current carrying on the strong passage of selecting as this carrier wave.
6. according to arbitrary described method in the claim 1 to 5, it is characterized in that, describedly select the strong passage of each UE to comprise according to up DPCH channel estimating:
For arbitrary UE, on each passage, choose the main footpath of a prominent footpath, and determine the maximum P of main footpath power in all passages as this passage
i Max
To lead footpath power greater than P
i MaxThe passage of-Δ is as the strong passage of described arbitrary UE, and Δ is default difference threshold.
7. method according to claim 6 is characterized in that, determines that the mode of passage upper pathway power is:
Wherein, ρ is the value determined according to the channel variation speed greater than 0 and less than 1 the recurrence factor, n is a subframe numbers.
8. according to arbitrary described method in the claim 1 to 5, it is characterized in that, describedly select the strong passage of each UE to comprise according to up DPCH channel estimating:
For arbitrary UE, on each passage, choose the main footpath of prominent M bar footpath as this passage, calculate on corresponding each passage all main footpaths on this passage power and, and determine all passage correspondences main footpath power and in maximum P
i Max
With the main footpath power of correspondence with greater than P
i MaxThe passage of-Δ is as the strong passage of described arbitrary UE, and Δ is default difference threshold.
9. method according to claim 8 is characterized in that, determines that the mode of passage upper pathway power is:
Wherein, ρ is the value determined according to the channel variation speed greater than 0 and less than 1 the recurrence factor, n is a subframe numbers.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102274354A CN101742679B (en) | 2008-11-25 | 2008-11-25 | Access control method in multi-channel system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102274354A CN101742679B (en) | 2008-11-25 | 2008-11-25 | Access control method in multi-channel system |
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| Publication Number | Publication Date |
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| CN101742679A true CN101742679A (en) | 2010-06-16 |
| CN101742679B CN101742679B (en) | 2012-07-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106304393A (en) * | 2015-12-24 | 2017-01-04 | 北京智谷睿拓技术服务有限公司 | Cut-in method, auxiliary cut-in method and device thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101272226B (en) * | 2007-03-23 | 2011-08-10 | 中兴通讯股份有限公司 | Indoor-overlapping multi-input multi-output system and method of TD-SCDMA system |
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2008
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106304393A (en) * | 2015-12-24 | 2017-01-04 | 北京智谷睿拓技术服务有限公司 | Cut-in method, auxiliary cut-in method and device thereof |
| CN106304393B (en) * | 2015-12-24 | 2020-09-04 | 北京智谷睿拓技术服务有限公司 | Access method, auxiliary access method and devices thereof |
| US10999747B2 (en) | 2015-12-24 | 2021-05-04 | Beijing Zhigu Rui Tuo Tech Co., Ltd. | Access method, auxiliary access method, and apparatuses thereof |
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| CN101742679B (en) | 2012-07-04 |
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Inventor after: Xu Shaojun Inventor after: Xing Lijun Inventor after: Tong Xuejian Inventor before: Xu Shaojun Inventor before: Xing Lijun Inventor before: Tong Xuejian |
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