CN102196544A - Power control method for enhanced absolute grant channel (E-AGCH)/high-speed shared control channel (HS-SCCH) - Google Patents

Power control method for enhanced absolute grant channel (E-AGCH)/high-speed shared control channel (HS-SCCH) Download PDF

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CN102196544A
CN102196544A CN2010101291557A CN201010129155A CN102196544A CN 102196544 A CN102196544 A CN 102196544A CN 2010101291557 A CN2010101291557 A CN 2010101291557A CN 201010129155 A CN201010129155 A CN 201010129155A CN 102196544 A CN102196544 A CN 102196544A
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agch
scch
open loop
snpl
transmit power
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张翼鹏
杨志伟
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TD Tech Ltd
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TD Tech Ltd
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Abstract

The invention discloses a power control method for an enhanced absolute grant channel (E-AGCH)/high-speed shared control channel (HS-SCCH). The method comprises the following steps of: setting maximum open loop transmission power corresponding to the E-AGCH or HS-SCCH in advance, and saving a serving-neighbor path loss (SNPL) of a cell edge user as SNPL0, wherein the maximum open loop transmission power corresponding to the E-AGCH or HS-SCCH is the open power transmission power, covering the cell edge user, of E-AGCH or HS-SCCH signals; and when the open loop transmission power of the E-AGCH or HS-SCCH is determined, extracting the SNPL from scheduling information (SI) reported by the UE, calculating a difference between the SNPL and the SNPL0, and subtracting the calculated difference from the maximum open loop transmission power corresponding to the E-AGCH or SH-SCCH to obtain a result as the open loop transmission power of the E-AGCH or HS-SCCH. By the method, the open loop transmission power can be reduced on the premise of guaranteeing the data receiving performance of the UE.

Description

The Poewr control method of a kind of E-AGCH/HS-SCCH
Technical field
The present invention relates to TD-SCDMA HSPA or HSPA+ technology, particularly the Poewr control method of a kind of E-AGCH/HS-SCCH.
Background technology
Among follow-up evolution HSPA of TD-SCDMA and the HSPA+,, deleted A-DPCH in order to support more online user number.Along with the online user number purpose increases, the probability of downlink user control channel HS-SCCH and E-AGCH open loop emission increases, and frequent descending open loop emission will bring serious descending interference problem.
E-AGCH and HS-SCCH adopt the downlink power control based on GAP.When twice scheduling interval greater than GAP, down transmitting power adopts open loop, during less than GAP, can adjust according to the power control commands word that corresponding up channel carries.
When E-AGCH or HS-SCCH were in the open loop emission state, open loop transmit power was determined (dB territory) according to following formula usually:
PWR OL＝Ec/N 0+L s+ISCP+Interf res-BFGain
Wherein, E c/ N 0Relevant with channel type, determine that by emulation for particular channel, this value is fixing; BFGain is a downlink forming gain, if use broadcast beam, this value is 0, if adopt business beam, is set to 9dB, Interf ResBe really to receive the interference margins that is provided with in order to guarantee that UE rectifies.These three amounts generally are configured to fixed value.L sBe the Serving cell path loss that UE measures, ISCP is the Interference Signal Code Power that UE measures.And the difficult real-time measurement values of obtaining these two amounts of network side, in order to guarantee the correct reception of cell edge UE, network side uses bigger default value to replace the L of UE actual measurement usually sAnd ISCP.Correspondingly, corresponding open loop power also can be bigger.But bigger open loop power can produce stronger interference to homogeneous-frequency adjacent-domain.
In order to reduce the interference of descending open loop transmit power, the air-conditioning degree is a kind of method commonly used.That is, when network has idle control channel resource, the user who does not have scheduling is for a long time dispatched, to reduce the probability of user's open loop.
But the air-conditioning degree need take the control channel resource, and can't use when busy when HSPA or HSPA+ resource are in.Therefore, can not solve the descending interference problem of bringing than big open loop transmit power.
Summary of the invention
In view of this, the invention provides the Poewr control method of a kind of E-AGCH/HS-SCCH, can under the prerequisite that guarantees the UE receptivity, effectively reduce open loop transmit power, and then reduce the descending interference that brings by open loop transmit power.
For achieving the above object, the present invention adopts following technical scheme:
The Poewr control method of a kind of E-AGCH/HS-SCCH comprises:
Corresponding E-AGCH or HS-SCCH set in advance maximum open loop transmit power, and the SNPL of Cell Edge User are preserved as SNPL0; The maximum open loop transmit power of E-AGCH or HS-SCCH correspondence is: E-AGCH or HS-SCCH signal cover the open loop transmit power of Cell Edge User;
When determining the open loop transmit power of E-AGCH or HS-SCCH, SNPL is extracted in the base station from the SI information that UE reports, calculate the poor of this SNPL and described SNPL0, and from the maximum open loop transmit power of E-AGCH or HS-SCCH correspondence, deduct the difference that calculates, with the open loop transmit power of result as described E-AGCH or HS-SCCH.
Preferably, after extracting SNPL, calculate the difference of SNPL and SNPL0 before, this method further comprises: the SNPL to extraction before carried out smoothly according to the time, again with level and smooth result as current SNPL, carry out the operation of described calculated difference.
Preferably, carrying out according to the time when level and smooth, smoothingtime is determined according to the SNPL of UE measuring period.
Preferably, described is the recurrence average treatment smoothly.
Preferably, this method further comprises: when same user's E-AGCH and HS-SCCH are in same descending time slot, if arbitrary channel is in the closed loop state among this user's E-AGCH and the HS-SCCH, another channel is in open loop situations, the open loop transmit power that then is in the open loop situations channel is:
OLPWR＝ILPWR+ΔPWR
Wherein, Δ PWR is default E-AGCH and the power bias between the HS-SCCH.
As seen from the above technical solution, among the present invention, corresponding E-AGCH or HS-SCCH set in advance maximum open loop transmit power, and SNPL that should maximum open loop transmit power correspondence preserves as SNPL0; When determining the open loop transmit power of E-AGCH or HS-SCCH, the SNPL of E-AGCH or HS-SCCH is extracted in the base station from the SI information that UE reports, the SNPL of calculating E-AGCH or HS-SCCH and SNPL0's is poor, this difference reflection UE is near the degree of center of housing estate, and then according to this difference size, on maximum open loop transmit power basis, reduce power, the numerical value that specifically reduces is determined according to the difference size, guarantee that on the one hand UE receives the performance of data, on the other hand, the open loop transmit power of reduction can reduce the interference to other sub-district generations.
Description of drawings
Fig. 1 is the Poewr control method of E-AGCH/HS-SCCH among 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 Serving cell that on the one hand utilizes SNPL and reflected and the path loss comparative result of adjacent sub-district, optimize the open loop transmit power of E-AGCH and HS-SCCH; On the other hand, E-AGCH and HS-SCCH are carried out the associating power control.
As stated in the Background Art, existing open loop transmit power determines in the mode that circuit loss value and ISCP relatively are difficult to obtain real-time measurement values, utilizes the default value that is provided with to replace measured value then to cause the problem that open loop power is bigger than normal.Based on this, the present invention is based on the existing basic principle of calculating open loop transmit power, other account forms of derivation open loop transmit power avoiding directly utilizing circuit loss value and ISCP, and select for use other physical quantitys of conveniently obtaining measured value to calculate.
UE measures the path loss of Serving cell and other co-frequency neighbor cells with some cycles, calculate SNPL, SNPL includes the relative distance information of UE apart from Lin Qu and co-frequency cell, and according to the definition of different vendor, SNPL has following two kinds of account forms (linear domain formula):
SNPL = 1 Σ n = 1 N L serv / L n type 1 min n ( L n ) L serv type 2
Wherein, L ServBe the Serving cell path loss amount that UE measures, L nThe path loss amount of n the adjacent area of measuring for UE.SNPL can reflect UE and this cellular-site location and face relative distance between the cell base station.
UE is more near cell edge, and the adjacent area path loss that UE measures is more little, and the Serving cell path loss is big more, and corresponding SNPL is also more little.On the contrary, UE is more near center of housing estate, and the adjacent area path loss that UE measures is big more, and the Serving cell path loss is more little, and corresponding SNPL is big more.Therefore,, can determine the distance of UE and cell edge, thereby optimize descending open loop transmit power by the SNPL information that UE reports.
In the descending open loop transmit power, the ISCP of path loss and UE side can be along with the position of distance center of housing estate, and the size disturbed of adjacent area and changing.In supposing that all adjacent areas are disturbed, there is the interference of a homogeneous-frequency adjacent-domain to account for leading.Suppose this adjacent area at the same time the down transmitting power in crack be P n, this adjacent area is (dB territory): P for the interfering signal power of this sub-district UE so n-L n
Wherein, L nFor from the base station of adjacent area n to the path loss amount of UE.The interfering signal power of UE side by the end make an uproar, disturb with the time slot code channel this sub-district and homogeneous-frequency adjacent-domain disturbs and is formed by stacking.Suppose that the homogeneous-frequency adjacent-domain interference was made an uproar the end of much larger than and with the interference of time slot code channel, the ISCP of UE measurement is so: ISCP=P n-L n
This ISCP and this sub-district path loss and be:
ISCP+L s＝P n+L s-L n＝P n-(L n-L s)＝P n-SNPL (1)
Simultaneously, according to the computing formula that has open loop transmit power now: PWR OL=Ec/N 0+ L s+ ISCP+Interf Res-BFGain can get open loop transmit power with above-mentioned formula (1) substitution and is:
PWR OL＝P n-SNPL+Ec/N 0+Interf res-BFGain (2)
In the open loop transmit power shown in the above-mentioned formula (2), adjacent area transmitting power P nBe the numerical value of a variation, and be difficult to determine.Therefore, directly determine open loop transmit power and improper according to following formula.
But can draw the relation of open loop transmit power and SNPL by this formula, wherein, the planning situation of SNPL and sub-district, and the position of UE is relevant.
Based on this, with the open loop transmit power that calculates in the background technology, as maximum open loop transmit power PWR MaxThis open loop transmit power can guarantee the correct covering of edge customer, and the SNPL of definite this open loop transmit power correspondence, be set at SNPL0, by aforementioned analysis as can be known, the SNPL0 of Cell Edge User is less value, and then corresponding maximum open loop transmit power, the user is the closer to center of housing estate, and corresponding SNPL value is increasing, if P nRemain unchanged, then by formula (2) as can be known, corresponding open loop transmit power can reduce gradually, still can guarantee the UE receptivity under the same disturbance situation.Simultaneously, because the setting of maximum open loop transmit power is the empirical value that obtains by the network optimization in advance, therefore, this open loop transmit power is guaranteeing that P is disturbed in corresponding adjacent area under the correct prerequisite that covers of edge customer nAlso be bigger interference value, it has been generally acknowledged that actual interference can keep or be lower than this value.
According to above-mentioned analysis, among the present invention, the current SNPL that reports as UE illustrates UE near center of housing estate during greater than SNPL0, and can reduce open loop transmit power this moment, specifically determines open loop transmit power according to following formula:
PWR OL＝PWR max-(SNPL-SNPL0) (3)
In above-mentioned derivation, two restrictive conditions have been supposed.First restrictive condition, exist the interference of a homogeneous-frequency adjacent-domain to account for leading, in actual environment, in most cases, this condition is satisfied in the suffered interference of user, when the user is subjected to the strong jamming of a plurality of homogeneous-frequency adjacent-domains, also can derive according to aforesaid way, just incite somebody to action the corresponding increase in interference adjacent area wherein, the form that derivation draws open loop transmit power is identical with formula (3).For another restrictive condition, the homogeneous-frequency adjacent-domain interference is made an uproar the end of much larger than and is disturbed with the time slot code channel, when not satisfying this condition, show that system load is lighter, can determine open loop transmit power this moment according to existing mode, because system load is lighter, thus open loop transmit power bigger can excessive influence not arranged to systematic function; Under the heavier situation of system load, use the present invention and reduce open loop transmit power, thereby can bigger lifting be arranged systematic function.
According to above-mentioned derivation and conclusion, E-AGCH/HS-SCCH Poewr control method basic among the present invention comprises:
Step 101, corresponding E-AGCH or HS-SCCH set in advance maximum open loop transmit power, and SNPL that should maximum open loop transmit power correspondence preserves as SNPL0.
Wherein, at E-AGCH or HS-SCCH corresponding maximum open loop transmit power is set respectively, this maximum open loop transmit power is: E-AGCH or HS-SCCH signal cover the open loop transmit power of Cell Edge User, the just open loop transmit power of determining according to the mode in the background technology.Here, because the different transmission properties of E-AGCH and HS-SCCH, therefore corresponding open loop transmit power value can be different, therefore needs to be provided with respectively.
SNPL0 is the SNPL value at respective cell edge, and this numerical value can obtain by the mode of emulation or actual measurement.
Step 102, when needs calculated the open loop transmit power of E-AGCH or HS-SCCH, SNPL was extracted in the base station from the SI information that UE reports.
Step 103 is calculated the poor of SNPL and SNPL0, and deduct the difference that calculates from the maximum open loop transmit power of E-AGCH or HS-SCCH correspondence, with the open loop transmit power of result as E-AGCH or HS-SCCH.
In this step, through type (3) calculates the open loop transmit power value.In this account form, SNPL can reflect the positional information of UE in the sub-district, reflects that by SNPL and the difference of SNPL0 the UE current location compares the open loop transmit power value that can save with cell edge.Calculate open loop transmit power according to this mode, can reduce performance number, thereby reduce interference adjacent sub-district.
Aforesaid way calculates the open loop transmit power value, and the real-time SNPL that directly utilizes UE to report calculates open loop transmit power.Consider problems such as measure error, signal fluctuation, for reflecting the positional information of UE more accurately, preferably, can also be after step 102 among the present invention, before the step 103, further comprise: the SNPL value of extracting was carried out smoothly according to the time, and choosing of smoothingtime can be definite measuring period according to the SNPL of UE, for example, smoothingtime is the SNPL integral multiple of measuring period, and specifically this smoothing processing can be that recurrence on average waits operation.Then, the result after level and smooth as current SNPL value, in step 103, is calculated the difference of level and smooth back result and SNPL0, from maximum open loop transmit power, deduct this difference again, obtain open loop transmit power.
By the way, the calculating of the open loop transmit power of E-AGCH and HS-SCCH is optimized, thereby under the prerequisite that guarantees the UE receptivity, reduced the open loop transmit power value, reduced interference adjacent sub-district by SNPL.
On the other hand, for overcoming the problem of mentioning in the background technology, on the basis of above-mentioned processing mode, the present invention also proposes, and E-AGCH and HS-SCCH are carried out the associating power control, carries out the open loop transmit power value thereby reduce, to reduce interference, specifically can realize in the following way the adjacent area:
When same user's E-AGCH and HS-SCCH are in same descending time slot, and one of them is in open loop situations, another one is in the closed loop state, open loop transmit power can with the channel transmitting power that is in the closed loop state carry out related, thereby reduce descending open loop transmit power;
When specifically carrying out association, for the channel that is in open loop situations, its open loop transmit power is added the certain power biasing with reference to time slot closed-loop control channel transmitting power, obtains the open loop transmit power value: OLPWR=ILPWR+ Δ PWR
Wherein, Δ PWR is the power bias of two channels.This power bias value can determine that at identical quality requirement (under for example certain BLER) emulation E-AGCH and HS-SCCH channel, the difference of the transmitting power of the two is as power bias value by emulation.
In aforesaid way, why consider E-AGCH and HS-SCCH with time slot are carried out the associating power control, reason is, channel disturbance situation with following two channels of time slot is identical, just can carry out the reference of power each other this moment, otherwise two channel disturbance situations differ greatly, and power reference has little significance each other.
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 (5)

1. the Poewr control method of an E-AGCH/HS-SCCH is characterized in that, this method comprises:
Corresponding E-AGCH or HS-SCCH set in advance maximum open loop transmit power, and the SNPL of Cell Edge User are preserved as SNPL0; The maximum open loop transmit power of E-AGCH or HS-SCCH correspondence is: E-AGCH or HS-SCCH signal cover the open loop transmit power of Cell Edge User;
When determining the open loop transmit power of E-AGCH or HS-SCCH, SNPL is extracted in the base station from the SI information that UE reports, calculate the poor of this SNPL and described SNPL0, and from the maximum open loop transmit power of E-AGCH or HS-SCCH correspondence, deduct the difference that calculates, with the open loop transmit power of result as described E-AGCH or HS-SCCH.
2. method according to claim 1, it is characterized in that, after extracting SNPL, calculate the difference of SNPL and SNPL0 before, this method further comprises: the SNPL to extraction before carried out smoothly according to the time, again with level and smooth result as current SNPL, carry out the operation of described calculated difference.
3. method according to claim 2 is characterized in that, is carrying out according to the time when level and smooth, and smoothingtime is determined according to the SNPL of UE measuring period.
4. method according to claim 2 is characterized in that, described is the recurrence average treatment smoothly.
5. according to arbitrary described method in the claim 1 to 5, it is characterized in that, this method further comprises: when same user's E-AGCH and HS-SCCH are in same descending time slot, if arbitrary channel is in the closed loop state among this user's E-AGCH and the HS-SCCH, another channel is in open loop situations, the open loop transmit power that then is in the open loop situations channel is:
OLPWR＝ILPWR+ΔPWR
Wherein, Δ PWR is default E-AGCH and the power bias between the HS-SCCH.
CN2010101291557A 2010-03-18 2010-03-18 Power control method for enhanced absolute grant channel (E-AGCH)/high-speed shared control channel (HS-SCCH) Pending CN102196544A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101345558A (en) * 2007-07-09 2009-01-14 大唐移动通信设备有限公司 Method and device for controlling ascending exterior ring power
CN101568173A (en) * 2008-04-21 2009-10-28 大唐移动通信设备有限公司 Method, device and system for controlling power

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101345558A (en) * 2007-07-09 2009-01-14 大唐移动通信设备有限公司 Method and device for controlling ascending exterior ring power
CN101568173A (en) * 2008-04-21 2009-10-28 大唐移动通信设备有限公司 Method, device and system for controlling power

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
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Application publication date: 20110921