CN100471083C - Method for carrying out power control on forward access channel - Google Patents
Method for carrying out power control on forward access channel Download PDFInfo
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- CN100471083C CN100471083C CNB2005100695800A CN200510069580A CN100471083C CN 100471083 C CN100471083 C CN 100471083C CN B2005100695800 A CNB2005100695800 A CN B2005100695800A CN 200510069580 A CN200510069580 A CN 200510069580A CN 100471083 C CN100471083 C CN 100471083C
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Abstract
The invention discloses a forward direction switch-in channel power control method, which comprises the following steps: the network side device gets descending channel mass parameter measured value of every user in one small area from upward message sent by user facility; the network side device accounts emitter power of current forward switch-in channel data frame sent by the area according to descending channel mass parameter; the network side device controls data frame sent by current forward switch-in channel data frame; The invention can meet every user's communication quality need, which saves the system's power resource.
Description
Technical field
The present invention relates to the power control techniques of mobile communication system, specially refer to a kind of method of forward access channel (FACH, Forward Access Channel) being carried out power control.
Background technology
The FACH channel is the Common transport channel of cell downlink data of carrying, can carry the signaling message of Radio Resource control (RRC, Radio Resource Control) layer it on and from the business datum on upper strata more.
Because the FACH channel is a Common transport channel, therefore, require the FACH channel should cover all users that communicate by letter simultaneously in the whole sub-district.Generally, simple on realizing, wireless communication system does not generally carry out power control to the FACH channel, that is to say, and the base station uses fixing transmitting power to send the data of FACH channel bearing usually.
Consider the fading effect of wireless signal self, and other district wireless signals are to the interference of this sub-district, wireless signal is in the propagation conditions of the cell edge very severe that will become; In addition, the user will greatly influence the quality of this wireless network and user's use experience to the correct probability of acceptance of rrc layer signaling message in the known cell, show after tested, suitably improve the FACH channel transmitting power, just can significantly improve in the sub-district user FACH channel is carried the correct probability of acceptance of RRC message, thereby can significantly improve the call completing rate and the communication quality of Cell Edge User.Therefore, in order to guarantee the reliable transmission of wireless signal on the FACH channel, guarantee user's communications quality in the sub-district, generally speaking, wireless communication system can be bigger fixed transmission power of FACH channel configuration.So, the call completing rate of user in the sub-district and communication quality just can have been guaranteed substantially.But, from another point of view, user for close base station location in the sub-district, because these users' transmission of wireless signals condition is better, may not need so high FACH channel emission power, therefore, the data of using higher fixed transmission power to send the FACH channel bearing will cause bigger power resource waste.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of method of the FACH channel being carried out power control, can dynamically adjust the FACH channel transmitting power, thereby in satisfying the sub-district, under the condition of each user communication quality, reach the purpose of saving the system power resource.
The method that forward access channel is carried out power control of the present invention may further comprise the steps:
A, network equipment obtain the measured value of each user's down channel quality parameter in the sub-district from the upstream message that subscriber equipment sends;
B, network equipment calculate the transmitting power that this sub-district sends current forward access channel data frame according to the measured value of the down channel quality parameter of each user in this sub-district, and the down channel quality that is obtained by described down channel quality parameter and the transmitting power of described current forward access channel data frame are inversely proportional to;
C, network equipment control base station use the transmitting power of the described current forward access channel data frame of step B to send current data frame.
The described upstream message of steps A is wireless resource control connection request message, cell update message, initial directly transplanting message or up directly transplanting message.
The described network equipment of step B calculates the transmitting power that this sub-district sends current forward access channel data frame according to the measured value of the down channel quality parameter of each user in this sub-district and comprises:
B1, network equipment calculate the forward access channel transmitting power of this user's correspondence according to the measured value of the down channel quality parameter of each user in this sub-district;
B2, if the forward access channel transmitting power of this user's correspondence greater than pre-configured forward access channel maximum transmission power, the forward access channel transmitting power that then makes this user's correspondence is described maximum transmission power; If the forward access channel transmitting power of this user's correspondence is less than pre-configured forward access channel minimum emissive power, the forward access channel transmitting power that then makes this user's correspondence is described minimum emissive power; If the forward access channel transmitting power of this user's correspondence then keeps the forward access channel transmitting power of this user's correspondence constant between described maximum transmission power and minimum emissive power;
B3, get the maximum in the forward access channel transmitting power of all user's correspondences of the current forward access channel data frame carrying that step B2 obtains, as the transmitting power of described current forward access channel data frame.
The described down channel quality parameter of step B is the energy interference ratio;
The described Calculation Method of step B1 is: the default transmitting power that the forward access channel transmitting power of described this user's correspondence equals pre-configured reference energy interference ratio numerical value correspondence adds the difference of the energy interference of the above reference energy interference ratio numerical value and this subscriber equipment that obtains in steps A than measured value.
The described down channel quality parameter of step B is a down receiving signal intensity;
The described Calculation Method of step B1 is: the default transmitting power that the forward access channel transmitting power of described this user's correspondence equals pre-configured reference down receiving signal strength values correspondence adds the difference of the down receiving signal intensity measurements of the above this subscriber equipment that obtains in steps A with reference to down receiving signal strength values and network equipment.
The described down channel quality parameter of step B is the downlink path loss;
The described Calculation Method of step B1 is: the default transmitting power that the forward access channel transmitting power of described this user's correspondence equals pre-configured reference downlink path loss numerical value correspondence deducts the difference of the downlink path loss measurement value of described this subscriber equipment that obtains in steps A with reference to downlink path loss numerical value and network equipment.
The described control of step C comprises:
C1, network equipment obtain a power bias value with the transmitting power that pre-configured forward access channel maximum transmission power deducts the described current forward access channel data frame of step B;
C2, network equipment are carried on described power bias value in the Frame of Iub interface forward access channel, send to the base station;
C3, base station deduct the power bias value that receives with described forward access channel maximum transmission power, obtain the transmitting power of current forward access channel data frame, and use this transmitting power to send described Frame.
In step C2, described power bias value is carried by the transmitting power cell in the Frame of described forward access channel.
This shows, in method of the present invention, network equipment can calculate the required transmitting power of current FACH Frame according to the down channel quality of each user in the sub-district, then by the FACH Frame that transmits on the Iub interface with the transmitting power informing base station that calculates, finish power control to the FACH channel, each user's communications quality reaches the purpose of saving the system power resource on the other hand to the requirement of FACH channel emission power in the sub-district thereby satisfy on the one hand.
Description of drawings
Fig. 1 is the method flow diagram that FACH is carried out power control of the present invention;
Fig. 2 has shown the data frame structure of Iub interface FACH channel.
Embodiment
Describe method of the present invention in detail below in conjunction with accompanying drawing and the preferred embodiments of the present invention.
In order to solve the problem that the bigger fixed transmission power of available technology adopting sends the power resource waste that the FACH signal brought, the invention provides a kind of method of the FACH channel being carried out power control, the core concept of this method is: network side is according to the mass parameter of this UE down channel that reports in the capable thereon message of each subscriber equipment (UE), all UE that calculating is satisfied in this sub-district correctly receive the desired FACH channel emission power of RRC message, and dynamically adjust the FACH channel transmitting power according to result calculated control base station.
Referring to Fig. 1, the method that the FACH channel is carried out power control of the present invention mainly may further comprise the steps:
A, network equipment obtain the down channel quality parameter of each user in the sub-district from the upstream message of UE.
Stipulate according to the 3GPP agreement, at some signaling process, for example: the RRC connection building process, in cell update flow process and the Non-Access Stratum signaling process, at network equipment, as RNC, use before downstream message of FACH Channel Transmission, all can at first receive subscriber equipment (UE) by Random Access Channel (RACH, Random Access Channel) upstream message of uploading, for example: the RRC connection request in the RRC connection building process (RRC CONNECTION REQUEST) message, initial directly transplanting in cell update in the cell update flow process (CELL UPDATE) message and the Non-Access Stratum signaling process (INITIAL DIRECT TRANSFER) message and up directly transplanting (UPLINK DIRECT TRANSFER) message.In above-mentioned these upstream messages, usually all can comprise the parameter that is used to indicate this UE down channel quality, for example: energy interference is than Ec/Io, down receiving signal intensity (RSSI, Received Signal Strength Indication), downlink path loss (PathLoss) etc., these parameters are commonly referred to as the down channel quality parameter here, these down channel quality parameters all are that UE obtains by measuring this cell downlink Common Pilot Channel.In concrete implementation procedure, network equipment can be according to actual conditions, require UE to report in the above-mentioned down channel quality parameter one or more in above-mentioned upstream message.Like this, network equipment just can obtain the quality of the down channel of each user's correspondence according to the parameter that these UE report, and wherein, energy interference is bigger more than Ec/Io or down receiving signal intensity, or the downlink path loss is more little, illustrates that then this user's down channel quality is good more; Otherwise, illustrate that then this user's down channel quality is poor more.
B, network equipment send the transmitting power of current FACH channel data frame according to this sub-district of down channel quality calculation of parameter of each user in this sub-district.
The basic principle that network equipment calculates described FACH transmitting power is that down channel quality is good more, and the transmitting power of current FACH channel data frame is just low more.
In concrete implementation procedure, network equipment can be selected to use down channel quality parameter arbitrarily according to actual conditions, carries out the calculating of FACH channel emission power.
In a preferred embodiment of the invention, network equipment uses energy interference recently to carry out described calculating.Concrete grammar is as follows:
Network equipment needs the maximum transmission power Max-Power and the minimum emissive power Min-Power of pre-configured FACH channel, also needs to dispose a base station simultaneously at the corresponding down default transmitting power Default-Power of given reference energy interference ratio numerical value Default (Ec/Io).
Suppose that the network equipment energy interference that certain UE reports in this sub-district that steps A obtains is Meas (Ec/Io) than measured value, then the FACH channel transmitting power Trans-Power of this UE correspondence will adopt following formula to calculate:
Trans-Power＝Default-Power+Default(Ec/Io)-Meas(Ec/Io)
From the aforementioned calculation formula as can be seen, energy interference than the big more situation of measured value Meas (Ec/Io) under, the transmitting power Trans-Power that calculates is just more little, therefore, just can be preferably under the situation at the down channel communication quality, suitably reduce the FACH channel transmitting power, thereby realize purpose of the present invention.
After calculating is finished, also will be further the FACH channel emission power of this user's correspondence of calculating be limited within the scope of set minimum and maximum transmitting power.Concrete grammar is: described Trans-Power is Max-Power if the transmitting power Trans-Power that calculates greater than the maximum transmission power Max-Power that is disposed, then makes; Described Trans-Power is Min-Power if the transmitting power Trans-Power that calculates less than the minimum emissive power Min-Power that is disposed, then makes; If Trans-Power is between described Max-Power and Min-Power, then Trans-Power remains unchanged.
If the FACH channel has only carried a user's downlink signaling in current Frame, the Trans-Power of this user's correspondence that then calculates just is the transmitting power of current FACH channel data frame; If the FACH channel has carried a plurality of users' downlink signaling in current Frame, the above-mentioned steps of then learning from else's experience restriction, the maximum in this sub-district in the FACH channel emission power of all user's correspondences is as the transmitting power of current FACH channel data frame.
In another preferred embodiment of the present invention, network equipment uses down receiving signal intensity to carry out described calculating.In this embodiment, network equipment also needs the maximum transmission power Max-Power and the minimum emissive power Min-Power of pre-configured FACH channel, in addition, also want configurating base station at given default transmitting power Default-Power with reference to correspondence under the down receiving signal intensity Default (RSSI).
The measured value of supposing the network equipment down receiving signal intensity that certain UE reports in this sub-district that steps A obtains is Meas (RSSI), and then the FACH channel transmitting power Trans-Power of this UE correspondence will adopt following formula to calculate:
Trans-Power＝Default-Power+Default(RSSI)-Meas(RSSI)
From the aforementioned calculation formula as can be seen, under the big more situation of down receiving signal intensity measurements Meas (RSSI), the transmitting power Trans-Power that calculates is just more little, therefore can realize purpose of the present invention.
Identical with a last embodiment is, after aforementioned calculation is finished, also needs the FACH channel emission power of this user's correspondence that further will calculate to be limited within the scope of set minimum and maximum transmitting power.In addition, if the FACH channel has carried a plurality of users' downlink signaling in current Frame, the above-mentioned restriction that then also needs to learn from else's experience, the maximum in this sub-district in the FACH channel emission power of all user's correspondences is as the transmitting power of current FACH channel data frame.
In another preferred embodiment of the present invention, network equipment uses the downlink path loss to carry out described calculating.In this embodiment, network equipment also needs the maximum transmission power Max-Power and the minimum emissive power Min-Power of pre-configured FACH channel.In addition, also want configurating base station at given default transmitting power Default-Power with reference to correspondence under the downlink path loss Default (PathLoss).
The measured value of supposing the network equipment downlink path loss that certain UE reports in this sub-district that steps A obtains is Meas (PathLoss), and then the FACH channel transmitting power Trans-Power of this UE correspondence will adopt following formula to calculate:
Trans-Power＝Default-Power-Default(PathLoss)+Meas(PathLoss)
From the aforementioned calculation formula as can be seen, under the more little situation of downlink path loss measurement value Meas (PathLoss), the transmitting power Trans-Power that calculates is just more little, therefore also can realize purpose of the present invention.
Identical with above-mentioned two embodiment is, after aforementioned calculation is finished, also needs the FACH channel emission power of this user's correspondence that further will calculate to be limited within the scope of set minimum and maximum transmitting power.In addition, under the situation of having carried a plurality of user's downlink signalings, the above-mentioned steps restriction that then also needs to learn from else's experience, the maximum in this sub-district in the FACH channel emission power of all user's correspondences is as the transmitting power of current FACH channel data frame.
In addition, need to prove, the method of the current FACH channel data frame of aforementioned calculation transmitting power only is the preferred embodiments of the present invention, the computational methods of described transmitting power are not limited to above-mentioned three kinds, in actual mechanical process, the parameter of this UE down channel quality of a plurality of signs that can also report in conjunction with UE is carried out COMPREHENSIVE CALCULATING.
C, network equipment control base station use the transmitting power of the current FACH channel data frame that calculates to send described FACH channel data frame.
The described control of this step can realize by the structure of the FACH channel data frame transmitted on the Iub interface between network equipment RNC and the base station.According to 3GPP agreement regulation, the FACH channel data frame on the Iub interface as shown in Figure 2 mainly comprises: letter head (Header) and payload (Payload) two parts.Wherein, the cell that Header mainly comprises has: a letter cyclic redundancy check (CRC) (Header CRC), flag bit (FT), frame number (CFN), transformat sign (TFI), transmitting power (Transmitpowerlevel) and reserve bytes, and the cell that Payload mainly comprises has: first transmission block (FirstTB), last transmission block (Last TB), reservation expansion (Spare Extension) and payload cyclic redundancy check (CRC) (Pay Load CRC) etc.In above-mentioned cell, described Transmit power level cell is used to indicate the bias Bias-Power of the transmitting power T-Power of current FACH Frame actual use when wireless transmission with respect to the maximum transmission power Max-Power of the FACH channel of wireless communication system configuration, i.e. Bias-Power=Max-Power-T-Power.Therefore, the transmitting power of the actual use of current FACH channel that network equipment can be at first calculates according to the maximum transmission power of system configuration and at step B calculates described bias Bias-Power, with the bias Bias-Power that calculates, send to the base station again by Transmit power level cell.The base station is after Transmit power level cell carries described bias Bias-Power in receiving current FACH Frame, the transmitting power T-Power that calculates the actual use of current FACH channel data frame according to the maximum transmission power Max-Power and the described bias Bias-Power of system configuration, described computational methods are: T-Power=Max-Power-Bias-Power, then, re-use this transmitting power and send described Frame, realize with the Frame being the FACH channel power control of unit.
This shows that method of the present invention can be that unit dynamically adjusts the FACH channel transmitting power according to the down channel quality of each user in the sub-district with the Frame, finish power control the FACH channel.The method of the invention can satisfy each user communication quality requirement in the sub-district on the one hand, has also saved the power resource of system on the other hand.
Claims (8)
1, a kind of method that forward access channel is carried out power control is characterized in that, said method comprising the steps of:
A, network equipment obtain the measured value of each user's down channel quality parameter in the sub-district from the upstream message that subscriber equipment sends;
B, network equipment calculates the transmitting power that this sub-district sends current forward access channel data frame according to the measured value of the down channel quality parameter of each user in this sub-district, the down channel quality that is obtained by described down channel quality parameter and the transmitting power of described current forward access channel data frame are inversely proportional to, if forward access channel has carried at least two users' downlink signaling in current Frame, the transmitted power that then sends current forward access channel data frame is limited within the scope of the maximum transmission power that sets in advance and minimum emissive power, if forward access channel has carried a user's downlink signaling in current Frame, the transmitting power of the forward access channel data frame that the transmitted power that then sends current forward access channel data frame calculates for the measured value according to this user's down channel quality parameter;
C, network equipment control base station use the transmitting power of the described current forward access channel data frame of step B to send current data frame.
2, the method for claim 1 is characterized in that, the described upstream message of steps A is wireless resource control connection request message, cell update message, initial directly transplanting message or up directly transplanting message.
3, the method for claim 1 is characterized in that,
The described network equipment of step B calculates the transmitting power that this sub-district sends current forward access channel data frame according to the measured value of the down channel quality parameter of each user in this sub-district and comprises:
B1, network equipment calculate the forward access channel transmitting power of this user's correspondence according to the measured value of the down channel quality parameter of each user in this sub-district;
The transmitted power of the current forward access channel data frame of described transmission is limited within the scope of the maximum transmission power that sets in advance and minimum emissive power and comprises:
B2, if the forward access channel transmitting power of described this user's correspondence of step B1 greater than pre-configured forward access channel maximum transmission power, the forward access channel transmitting power that then makes this user's correspondence is described maximum transmission power; If the forward access channel transmitting power of described this user's correspondence of step B1 is less than pre-configured forward access channel minimum emissive power, the forward access channel transmitting power that then makes this user's correspondence is described minimum emissive power; If the forward access channel transmitting power of described this user's correspondence of step B1 then keeps the forward access channel transmitting power of this user's correspondence constant between described maximum transmission power and minimum emissive power;
B3, get the maximum in the forward access channel transmitting power of all user's correspondences of the current forward access channel data frame carrying that step B2 obtains, as the transmitting power of described current forward access channel data frame.
4, method as claimed in claim 3 is characterized in that, the described down channel quality parameter of step B is the energy interference ratio;
The described Calculation Method of step B1 is: the default transmitting power that the forward access channel transmitting power of described this user's correspondence equals pre-configured reference energy interference ratio numerical value correspondence adds the difference of the energy interference of the above reference energy interference ratio numerical value and this subscriber equipment that obtains in steps A than measured value.
5, method as claimed in claim 3 is characterized in that, the described down channel quality parameter of step B is a down receiving signal intensity;
The described Calculation Method of step B1 is: the default transmitting power that the forward access channel transmitting power of described this user's correspondence equals pre-configured reference down receiving signal strength values correspondence adds the difference of the down receiving signal intensity measurements of the above this subscriber equipment that obtains in steps A with reference to down receiving signal strength values and network equipment.
6, method as claimed in claim 3 is characterized in that, the described down channel quality parameter of step B is the downlink path loss;
The described Calculation Method of step B1 is: the default transmitting power that the forward access channel transmitting power of described this user's correspondence equals pre-configured reference downlink path loss numerical value correspondence deducts the difference of the downlink path loss measurement value of described this subscriber equipment that obtains in steps A with reference to downlink path loss numerical value and network equipment.
7, the method for claim 1 is characterized in that, the described control of step C comprises:
C1, network equipment obtain a power bias value with the transmitting power that pre-configured forward access channel maximum transmission power deducts the described current forward access channel data frame of step B;
C2, network equipment are carried on described power bias value in the Frame of Iub interface forward access channel, send to the base station;
C3, base station deduct the power bias value that receives with described forward access channel maximum transmission power, obtain the transmitting power of current forward access channel data frame, and use this transmitting power to send described Frame.
8, method as claimed in claim 7 is characterized in that, in step C2, described power bias value is carried by the transmitting power cell in the Frame of described forward access channel.
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| CNB2005100695800A CN100471083C (en) | 2005-05-16 | 2005-05-16 | Method for carrying out power control on forward access channel |
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| CNB2005100695800A CN100471083C (en) | 2005-05-16 | 2005-05-16 | Method for carrying out power control on forward access channel |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101192858B (en) * | 2006-11-23 | 2011-07-27 | 鼎桥通信技术有限公司 | Method and device for power control in the downlink high-speed data transmission system |
| CN100574493C (en) * | 2007-09-24 | 2009-12-23 | 华为技术有限公司 | Channel emitting power configuring method and device thereof |
| CN101499814B (en) * | 2008-01-30 | 2012-09-05 | 京信通信系统（中国）有限公司 | Parameter measurement method for WCDMA system co-channel multi-cell downlink |
| CN101938773B (en) | 2009-06-30 | 2014-11-05 | 中兴通讯股份有限公司 | Initial transmitting power acquisition method and base station |
| CN101895976B (en) * | 2010-07-21 | 2013-10-23 | 北京交通大学 | LTE-Advanced system-based uplink power adjustment method |
| CN102244923B (en) * | 2011-07-25 | 2018-04-27 | 中兴通讯股份有限公司 | A kind of Poewr control method of uplink signal, network side equipment and user equipment |
| CN104754714A (en) * | 2013-12-30 | 2015-07-01 | 中兴通讯股份有限公司 | Method and device for determining sending power of switchover command and base station |
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