CN100338888C - Power offset control method of transmission power control instruction signal in WCDMA system - Google Patents
Power offset control method of transmission power control instruction signal in WCDMA system Download PDFInfo
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- CN100338888C CN100338888C CNB2005100678716A CN200510067871A CN100338888C CN 100338888 C CN100338888 C CN 100338888C CN B2005100678716 A CNB2005100678716 A CN B2005100678716A CN 200510067871 A CN200510067871 A CN 200510067871A CN 100338888 C CN100338888 C CN 100338888C
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Abstract
The present invention relates to a power offset controlling method of a transmission power controlling instruction signal executed by a wireless network controller in a wideband code division multiple access (WCDMA) system. The method controls the power offset of a base station to a transmission power controlling instruction signal of a mobile station on purpose according to the cyclic redundancy check (CRC) result and the preset block error rate target value of each transmitting data block received by the base station from the mobile station and different requirements for service quality used by users. Therefore, the present invention not only can ensure the service quality of an up link of a system, but also can avoid the negative influence of excessive power offset adjustment to the whole system.
Description
Technical field
The invention belongs to the downstream signal Poewr control method of moving communicating field, be specifically related to the control method of the performed transmission power control instruction signal power bias of radio network controller (RNC) in Wideband Code Division Multiple Access (WCDMA) (WCDMA) mobile communication system.
Background technology
The WCDMA system is a kind of modulation and multiple access technique based on spread spectrum communication, it comprises travelling carriage, wireless access network (RAN) and core net (CN) three parts, RAN mainly is made up of with radio network controller (RNC) base station (NodeB), and each RNC need control a plurality of base stations.In the WCDMA communication system, in order to reduce to disturb, maximized system capacity should satisfy under the condition of certain Quality of Service, makes the transmitting power minimum of base station and travelling carriage.Therefore, it is essential in the WCDMA system power being controlled.
Adopted the uplink closed loop method in the WCDMA system: signal interference ratio (the Signal to Interference of the signal that periodic measurement travelling carriage emission in base station comes, SIR), then this measured value and given signal interference ratio desired value are compared, generate transmission power control instruction (Transmission Power Control Command according to comparative result then, TPCCommand), and transmission power control instruction send to travelling carriage; Travelling carriage is adjusted the transmitting power of oneself according to transmission power control instruction, can approach the signal interference ratio desired value so that arrive the signal interference ratio of signal of base station.If the transmission power control instruction signal that produces in the uplink closed-loop power control process can not be sent to travelling carriage exactly, also can cause travelling carriage can not adjust its transmitting power in time along with the variation of wireless environment.
In above-mentioned Poewr control method, an important step is to guarantee that transmission power control instruction signal can correctly be moved platform and receive.Therefore, be provided with exactly by base station and be very important for the transmitting power of the transmission power control instruction signal of travelling carriage.In the WCDMA system, transmission power control instruction partly uses identical frequency emission with downlink data, but the transmitting power of transmission power control instruction signal should be higher than the transmitting power of downlink data part signal, thereby guarantees that the base station issues the power control instruction of travelling carriage and can be received in high quality by travelling carriage.Wherein, the part that the transmitting power of transmission power control instruction signal is higher than the transmitting power of downlink data part signal be called as the transmission power control instruction signal power bias (TPCCommand Power Offset, PO2).Undoubtedly, the too high increase system interference of the power bias value of transmission power control instruction signal causes power system capacity to descend, and too lowly can not correctly send to travelling carriage to power control instruction, causes it to adjust its transmitting power mistakenly.Therefore, need a kind of method of power bias that the base station sends to the transmitting power control signal of travelling carriage of in the WCDMA system, controlling effectively.
Summary of the invention
The control method that the purpose of this invention is to provide a kind of WCDMA system emission power control command signal power bias.
Basic principle of the present invention is as follows: in radio network controller, according to cyclic redundancy check (CRC) (the Cyclic Redundancy Check from each transmission data block of travelling carriage of base station to being received, CRC) result and predetermined Block Error Rate (BlockError Rate) desired value are adjusted the power bias value of transmission power control instruction signal adaptively, to guarantee that the base station can correctly send to travelling carriage with power control instruction.Since the transmitting power setting of transmission power control instruction signal be by specify with the same frequency physical channel in the biasing of data division signal power realize, therefore to the control of the transmitting power of transmission power control instruction signal, in fact be exactly control to the transmission power control instruction signal power bias.If the quality of one section interior up link of long period is all fine, can illustrate that then during this period of time travelling carriage has correctly received transmission power control instruction, can attempt reducing the transmitting power of transmission power control instruction signal this moment, just reduces the power bias value of transmission power control instruction signal.If the poor quality of one section interior up link of long period, can illustrate then that during this period of time travelling carriage fails correctly to receive transmission power control instruction, should attempt increasing the transmitting power of transmission power control instruction signal this moment, just strengthens the power bias value of transmission power control instruction signal.In the WCDMA system, uplink data is that unit sends with the data block, evaluation for uplink quality, at first reception is carried out cyclic redundancy check (CRC) from the transmission data block of travelling carriage by the base station, as check results correctly then the result be set to 0, think then that as the check results mistake this transmission data block mistake and result are set to 1, will send to radio network controller to the result of data block check then.The Block Error Rate numerical value of radio network controller statistics piece in the certain hour section, this Block Error Rate are higher than certain predetermined value and think that then uplink quality is bad, think that uplink quality is normal if Block Error Rate is lower than predetermined value.Because the WCDMA system provides different business for the user, therefore each professional desired quality of service difference is carrying out also difference of uplink quality judgement time institute's accepted standard to different business.Particularly, for requiring high-quality data service, block error probability desired value is 0.001, and promptly actual Block Error Rate must not surpass this desired value, and for general voice service, block error probability desired value 0.01.Stipulate according to the WCDMA agreement, the power bias upper and lower limit of transmission power control instruction signal is 6dB and 0dB, in this upper and lower limit scope, divides 24 power bias and adjusts step-length, then the adjustment step-length of each power bias is 0.25dB, and PO2Step represents with symbol.Because WCDMA system requirements transmitting power as far as possible smoothly changes, it is 3db and 0dB that the power bias that therefore method of the present invention adopted is adjusted upper and lower limit.
According to above principle, method of the present invention is in determining some cycles under the bad situation of uplink quality, power bias step-length of power bias that the base station sends to the transmission power control instruction signal of travelling carriage will be improved, continue to estimate uplink quality at next cycle then, determine further power bias controlling party to.Similarly, method of the present invention is in determining some cycles under the uplink quality good situations, power bias step-length of power bias that the base station sends to the transmission power control instruction signal of travelling carriage will be reduced, continue to estimate uplink quality at next cycle then, determine further power bias controlling party to.Under the method for the present invention situation that uplink quality is general in determining some cycles, to keep the base station to send to the power bias of the transmission power control instruction signal of travelling carriage, continue to estimate uplink quality at next cycle then, determine further power bias controlling party to.
WCDMA system power control command signal power offset control method of the present invention comprises step:
Radio network controller is provided with the bound of transmission power control instruction signal power bias value and adjusts step-length, and is transferred to the base station; Radio network controller uses professional quality requirement that block error probability desired value, up-link service quality assessment cycle and transmission power control instruction signal power bias control cycle are set according to travelling carriage, transmission power control instruction signal power bias control cycle be up-link service quality assessment cycle integer M doubly;
At each up-link service quality in assessment cycle, cyclic redundancy check (CRC) is carried out to the uplink data block that is received in the base station, and send check results to radio network controller, calculate each up-link service quality Block Error Rate of assessment cycle by radio network controller;
In each transmission power control instruction signal power bias control cycle, select the power bias value of transmission power control instruction signal according to the uplink service quality in this cycle; M Block Error Rate being calculated all be lower than the user and used professional block error probability desired value M in this cycle up-link service quality assessment cycle, judge that then the uplink service quality is good, the power bias that the base station is sent to the transmission power control instruction signal of travelling carriage reduces a power bias step-length; M Block Error Rate being calculated all be higher than the user and used professional block error probability desired value M in this cycle up-link service quality assessment cycle, judge that then uplink service is second-rate, the power bias that the base station is sent to the transmission power control instruction signal of travelling carriage improves a power bias step-length; A M Block Error Rate part being calculated be lower than the user and used professional block error probability desired value M in this cycle up-link service quality assessment cycle, and another part is higher than the block error probability desired value that the user uses business, judge that then uplink service is fair, the power bias that the base station is sent to the transmission power control instruction signal of travelling carriage keeps original level; Power bias is improved a step-length, reduces a step-length or keeps previous level, specifically carry out by radio network controller control base station.
Above-mentioned power offset control method of the present invention, the upper and lower limit of set transmission power control instruction signal power bias value are 3dB and 0dB, and the adjustment step-length of setting is 0.25Db.
Above-mentioned power offset control method of the present invention, for high-quality data service, block error probability desired value is set to 0.001, and uplink quality assessment cycle is set to 40 seconds, and M is chosen as 3.
Above-mentioned power offset control method of the present invention, for general voice service, block error probability desired value is set to 0.01, and uplink quality assessment cycle is set to 4 seconds, and M is chosen as 5.
Adopt the power offset control method of transmission power control instruction signal in the WCDMA of the present invention system, can be according to the employed different business of user, control the power bias of base station targetedly to the transmission power control instruction signal of travelling carriage, thereby guarantee the uplink service quality of system, can avoid too much power bias adjustment again the whole system negative effect.
Description of drawings
Fig. 1 is a system configuration schematic diagram of carrying out the power offset control method of WCDMA system emission power control command signal of the present invention.
Fig. 2 is the basic step schematic diagram of power offset control method of the transmission power control instruction signal of WCDMA of the present invention system.
Embodiment
Describe the present invention in detail with reference to one embodiment of the present of invention and accompanying drawing thereof below.
Fig. 1 has showed the system construction drawing of the transmission power control instruction power offset control method that adopts WCDMA of the present invention system.At least relate to a travelling carriage 120, a base station 110 and a radio network controller 100 when as shown in Figure 1, WCDMA of the present invention system carries out the control of transmission power control instruction signal power bias.Base station 110 is measured the signal interference ratio (SIR) of the signal that travelling carriages 120 send and each transmission block is carried out Cyclic Redundancy Check, and each transmission data block and CRC check result thereof are delivered to radio network controller 110.Radio network controller 100 calculates Block Error Rate (BLER) according to the CRC check result of these transmission blocks, according to BLER value and block error probability desired value (BLER
Target) calculating the power bias value of transmission power control instruction signal, the power bias with transmission power control instruction signal mails to base station 110 then.The power bias of the transmission power control instruction signal that base station 110 is sent here according to radio network controller is determined the transmitting power of transmission power control instruction signal, with this power transmission power control instruction signal is sent to travelling carriage 120 then.Travelling carriage 120 receives the transmission power control instruction that sends from the base station, and adjusts its transmitted power according to transmission power control instruction.
As shown in Figure 1, the WCDMA system comprises a radio network controller 100, a base station 110 and a travelling carriage 120, base station controller 100 wherein is connected with base station 110, travelling carriage 120 is connected with base station 110, and travelling carriage 120 can move with variable velocity in the different districts scope of system.
The relevant part of transmission data block transmission is transmission power control instruction processing unit 121 and transmitting power adjustment unit 123 in the travelling carriage 120.The transmission power control instruction 117 that transmission power control instruction processing unit 121 receives from base station 110, the numerical value of this instruction 117 can be 1 or-1, correspondingly transmission power control instruction processing unit 121 generation transmitting powers adjustment step-lengths 122 are Δ
TPCOr-Δ
TPC, and power is adjusted step-length notify transmitting power adjustment unit 123, the value that transmitting power adjustment unit 123 is adjusted step-length according to power is adjusted the transmitting power of travelling carriage, and with this adjusted transmitting power, gives base station 110 with transmission of data blocks.
Part relevant with the control of transmission power control instruction signal power bias in the base station 110 is transmission data block cyclic-redundancy-check unit 111, signal-to-interference ratio measurement unit 113, transmission power control instruction generation unit 115 and transmission power control instruction transmitting element 117.Wherein, the signal interference ratio 114 of the signal 120 that receives from travelling carriage 120 is measured in signal-to-interference ratio measurement unit 113, and send it to transmission power control instruction generation unit 115, the signal interference ratio desired value 102 that signal interference ratio 114 that transmission power control instruction generation unit 115 comparison signal-to-interference ratio measurement unit 113 are sent here and wireless network control 100 are sent here, generate transmission power control instruction 116 according to following principle then: if signal interference ratio 114 less than signal interference ratio desired value 102, then the value of transmission power control instruction is 1; If signal interference ratio 114 is more than or equal to signal interference ratio desired value 102, then the value of transmission power control instruction is-1.Transmission power control instruction generation unit 115 will send to transmission power control instruction transmitting element 117 according to the transmission power control instruction 116 that mentioned above principle generates.The transmitting power that transmission power control instruction power bias value that transmission power control instruction transmitting element 117 is sent according to radio network controller 100 101 is specified sends to travelling carriage 120 with transmission power control instruction 116.111 pairs of transmission data blocks 124 that send from travelling carriage 120 of transmission data block cyclic-redundancy-check unit carry out the transmission data block cyclic redundancy check (CRC) in the base station, verification correctly then is changed to 0 with the cyclic redundancy check (CRC) result of this transmission data block, and transmission data block check errors then result is changed to 1.Last transport block cyclic redundancy check unit 111 sends to radio network controller 100 with transmission data block cyclic redundancy check (CRC) result 112.
Part relevant with the power bias control of transmission power control instruction signal in the radio network controller 100 is Block Error Rate computing unit 102 and transmission power control instruction power bias control unit 103.It is the ratio that 1 transmission block accounts for the transmission block sum of receiving that the transport block cyclic redundancy check result 112 that Block Error Rate computing unit 102 is sent here according to base station 110 calculates cyclic redundancy check (CRC) result in one period, and this ratio 104 is delivered to transmission power control instruction power bias control unit 103.Transmission power control instruction power bias control unit 103 is according to upper and lower limit 106 and adjustment step-length 107, up-link service quality assessment cycle 108 and the transmission power control instruction power bias control cycle 109 of Block Error Rate 104, predefined block error probability desired value 105, predefined transmission power control instruction power bias value, according to the power bias value 101 of method calculating transmission power control instruction signal of the present invention, then it is delivered to the transmission power control instruction transmitting element 117 of base station 110.
When adopting method of the present invention, the value of block error probability desired value 105 is that the quality requirement by concrete business decides.Usually, the block error probability desired value of normal speech business is 0.01, and the block error probability desired value of quality data business is 0.001.In addition, in the transmission course of business, the loading condition current according to network, block error probability desired value 105 can dynamically be adjusted, promptly when offered load is heavier, block error probability desired value 105 can be suitably increased, when offered load is light, block error probability desired value 105 can be suitably reduced.
The bound 106 of transmission power control instruction power bias and adjustment step-length 107 protocol compliant require to get final product, and are traditionally arranged to be and are limited to 3dB and 0dB up and down, and step-length is 0.25dB.In addition, in professional transmission course, also can be according to the wireless propagation environment and the service distribution situation of the current loading condition of network, specific cell, the bound 106 of transmission power control instruction power bias and adjustment step-length 107 also can dynamically be adjusted.
Up-link service quality assessment cycle 108 and transmission power control instruction power bias control cycle 109 are that type and the quality requirement by concrete business decides.Obviously, for the high-quality business of WCDMA network support, require BLER less than 0.001 usually, it is very rare that the block check mistake takes place.For requiring BLER is that transmission time of 0.001 and data block is the business of 40ms, and shoulding be the average time that a data block check mistake takes place is 40 milliseconds/0.001=40 second.Correspondingly, up-link service quality assessment cycle 108 should could guarantee the validity of evaluation the quality greater than 40s.In addition, must satisfy the integral multiple that transmission power control instruction power bias control cycle 109 is up-link service quality assessment cycles 108.
Fig. 2 is the basic step of the transmission power control instruction signal power offset control method of WCDMA of the present invention system.Method of the present invention starts from step 200, for transmission power control instruction power bias control unit 103 is finished some initial work.At first, determine block error probability desired value.Block error probability desired value is by the comprehensive decision of the quality requirement of concrete business and current network loading condition, speech business block error probability desired value be set to 0.01, the block error probability desired value of quality data business is set to 0.001.The bound and the adjustment step-length of transmission power control instruction power bias are set then.According to the WCDMA agreement, the upper and lower bound of transmission power control instruction power bias is respectively 24 and 0, corresponding 6dB of difference and 0dB, and the adjustment step-length of transmission power control instruction power bias is 0.25dB accordingly, is designated as PO2Step.In fact, for the WCDMA system, generally require the power can smooth change, so the present invention adopts the upper limit of the transmission power control instruction power bias that suitably reduces, getting 12 be that 3dB is just passable.At last, up-link service quality assessment cycle and transmission power control instruction power bias control cycle are set.Its typical Block Error Rate is 1% under the required quality situation providing in speech business, and non real-time Packet data service Block Error Rate before retransmitting can reach 10%～20%, and high-quality business requires Block Error Rate less than 0.001 usually.Correspondingly, in the transmission course of the business that these different qualities require, the average time of making a mistake is also different, accordingly, up-link service quality assessment cycle also should be different to some extent with transmission power control instruction power bias control cycle, should guarantee can reflect in assessment cycle at a up-link service quality mean value of network servicequality at least.Consider the sum of errors sluggishness that ascending exterior ring power control may exist, transmission power control instruction power bias control cycle should be longer, make can be in one period longer time the observed traffic quality, thereby reduce the influence of ascending exterior ring power control to quality of service as far as possible.In addition, for the ease of calculating, also requiring transmission power control instruction power bias control cycle is the up-link service quality integral multiple of assessment cycle.Method of the present invention is for high-quality data service, and it is 40 seconds that up-link service quality assessment cycle is set, and transmission power control instruction power bias control cycle is 3 times of up-link service quality assessment cycle, promptly 120 seconds.Method of the present invention is for general voice service, and it is 4 seconds that up-link service quality assessment cycle is set, and transmission power control instruction power bias control cycle is 5 times of up-link service quality assessment cycle, promptly 20 seconds.
In step 210, in assessment cycle, radio network controller receives N altogether at i up-link service quality
Total(i) individual transmission data block, wherein total N
Error(i) individual transmission data block is the CRC check mistake, then calculates block error rate BLER
Meas(i) as follows:
Then obtain this uplink quality interior assessed value ULQ (i) of assessment cycle, specifically be calculated as follows:
In step 220, suppose that having finished M Block Error Rate in J transmission power control instruction power bias control cycle calculates, the uplink quality assessed value that obtains is respectively: ULQ (1), ULQ (2) ..., ULQ (M), calculate the power bias value PO2 (j) of the transmission power control instruction of this adjustment cycle according to following rule:
If ULQ (1), ULQ (2) ..., ULQ (M) is less than 0, PO2 (j)=PO2 (j-1)-PO2Step then.If PO2 (j) is less than the lower limit of transmission power control instruction power bias, then PO2 (j) equals the lower limit of transmission power control instruction power bias.Wherein, PO2 (j-1) is meant the power bias value of the transmission power control instruction that calculates in j-1 transmission power control instruction power bias control cycle.
If ULQ (1), ULQ (2) ..., ULQ (M) is greater than 0, PO2 (j)=PO2 (j-1)+PO2Step then.If PO2 (j) is greater than the upper limit of transmission power control instruction power bias, then PO2 (j) equals the upper limit of transmission power control instruction power bias.
If ULQ (1), ULQ (2) ..., ULQ (M) part greater than 0 another part less than 0, PO2 (j)=PO2 (j-1) then.
With high-quality data service is example, if the assessed value of 3 up-link service quality assessment cycles of measuring in 120 seconds is 0,0,0, then the power bias with transmission power control instruction signal reduces 0.25dB, but must not be lower than lower limit 0dB; If assessed value is 1,1,1, then power bias is improved 0.25dB, but must not be higher than upper limit 3dB; If assessed value is 0,1,0, then keep current power bias.
With general voice service is example, if the assessed value of 5 up-link service quality assessment cycles of measuring in 20 seconds is 0,0,0,0,0, then the power bias with transmission power control instruction signal reduces 0.25dB, but must not be lower than lower limit 0dB; If assessed value is 1,1,1,1,1, then power bias is improved 0.25dB, but must not be higher than upper limit 3dB; If assessed value is 0,1,0,0,1, then keep current power bias.
Claims (3)
1. WCDMA system power control command signal power offset control method comprises step:
Radio network controller is provided with the bound of transmission power control instruction signal power bias value and adjusts step-length, and is transferred to the base station; Radio network controller uses professional quality requirement that block error probability desired value, up-link service quality assessment cycle and transmission power control instruction signal power bias control cycle are set according to travelling carriage, transmission power control instruction signal power bias control cycle be up-link service quality assessment cycle integer M doubly;
At each up-link service quality in assessment cycle, cyclic redundancy check (CRC) is carried out to the uplink data block that is received in the base station, and send check results to radio network controller, calculate each up-link service quality Block Error Rate of assessment cycle by radio network controller;
In each transmission power control instruction signal power bias control cycle, select the power bias value of transmission power control instruction signal according to the uplink service quality in this cycle; M Block Error Rate being calculated all be lower than the user and used professional block error probability desired value M in this cycle up-link service quality assessment cycle, judge that then the uplink service quality is good, the power bias that the base station is sent to the transmission power control instruction signal of travelling carriage reduces a power bias step-length; M Block Error Rate being calculated all be higher than the user and used professional block error probability desired value M in this cycle up-link service quality assessment cycle, judge that then uplink service is second-rate, the power bias that the base station is sent to the transmission power control instruction signal of travelling carriage improves a power bias step-length; A M Block Error Rate part being calculated be lower than the user and used professional block error probability desired value M in this cycle up-link service quality assessment cycle, and another part is higher than the block error probability desired value that the user uses business, judge that then uplink service is fair, the power bias that the base station is sent to the transmission power control instruction signal of travelling carriage keeps original level; Power bias is improved a step-length, reduces a step-length or keeps previous level, specifically carry out by radio network controller control base station;
The upper and lower limit of set transmission power control instruction signal power bias value is respectively 3dB and 0dB, the adjustment step-length that is provided with is 0.25dB, improving or reducing in the power bias step, the power bias of Huo Deing must not exceed this upper and lower limit institute restricted portion at last.
2. power offset control method according to claim 1, for high-quality data service, block error probability desired value is set to 0.001, and uplink quality assessment cycle is set to 40 seconds, and M is chosen as 3.
3. power offset control method according to claim 1, for general voice service, block error probability desired value is set to 0.01, and uplink quality assessment cycle is set to 4 seconds, and M is chosen as 5.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000045528A1 (en) * | 1999-01-28 | 2000-08-03 | Qualcomm Incorporated | Method and apparatus for controlling transmission power in a potentially transmission gated or energy capped communication system |
| CN1278128A (en) * | 2000-07-01 | 2000-12-27 | 深圳市中兴通讯股份有限公司上海第二研究所 | Method and system of outer loop power control |
| CN1327646A (en) * | 1998-12-07 | 2001-12-19 | 诺基亚网络有限公司 | Power control method and system in mobile communication networks |
| CN1335695A (en) * | 2000-09-19 | 2002-02-13 | 深圳市中兴通讯股份有限公司 | Outer loop power control method for WCDMA system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1327646A (en) * | 1998-12-07 | 2001-12-19 | 诺基亚网络有限公司 | Power control method and system in mobile communication networks |
| WO2000045528A1 (en) * | 1999-01-28 | 2000-08-03 | Qualcomm Incorporated | Method and apparatus for controlling transmission power in a potentially transmission gated or energy capped communication system |
| CN1278128A (en) * | 2000-07-01 | 2000-12-27 | 深圳市中兴通讯股份有限公司上海第二研究所 | Method and system of outer loop power control |
| CN1335695A (en) * | 2000-09-19 | 2002-02-13 | 深圳市中兴通讯股份有限公司 | Outer loop power control method for WCDMA system |
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