CN102238710A - Uplink closed-loop power control method, node B and radio network controller (RNC) - Google Patents
Uplink closed-loop power control method, node B and radio network controller (RNC) Download PDFInfo
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- CN102238710A CN102238710A CN2010101736480A CN201010173648A CN102238710A CN 102238710 A CN102238710 A CN 102238710A CN 2010101736480 A CN2010101736480 A CN 2010101736480A CN 201010173648 A CN201010173648 A CN 201010173648A CN 102238710 A CN102238710 A CN 102238710A
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Abstract
The invention discloses an uplink closed-loop power control method, node B and radio network controller (RNC), which provide an outer-loop power control scheme for a high-speed shared information channel (HS-SICH) of a high-speed downlink shared channel (HS-DSCH) and enhance the performances of the HS-SICH. The method comprises the following steps that: when receiving the HS-SICH, the node B computes the confidence of the HS-SICH and reports the confidence to the RNC; and the RNC periodically compares the confidence of the HS-SICH with the preset confidence threshold and adjusts the signal to interference ratio (SIR) target value during inner-loop power control of the HS-SICH according to the comparison result, and the node B uses the SIR target value to carry out inner-loop power control in the next inner-loop power control period.
Description
Technical field
The present invention relates to code division multiple access system, relate in particular to method, base station and the radio network controller of uplink closed loop in TD SDMA (TD-SCDMA) system.
Background technology
High-speed downlink packet inserts (HSDPA, High Speed Downlink Packet Access) technology can be applied to TD-SCDMA (Time Division-Synchronous Code DivisionMultiple Access, TD SDMA) in the system, thereby improves the data throughout and the peak data rate of down link greatly.Particularly, when in base station (Node B), using the HSDPA technology, require the specific physical channel of three kinds of HSDPA of physical layer support of Node B, be respectively HS-SCCH (High-Speed Shared Control Channel, High-Speed Shared Control Channel), HS-PDSCH (High-Speed Physical Downlink Shared Channel, high-speed physical downlink shared channel (HS-PDSCH)) and HS-SICH (High-Speed Shared Information Channel, high-speed shared information channel).
Wherein, HS-SCCH is a downlink shared control channel, and Node B utilizes this channel to send HSDPA signaling, this channel of time division multiplexing between different HSDPA subscriber equipmenies to the HSDPA subscriber equipment.HS-SICH is a uplink shared channel, and the HSDPA subscriber equipment utilizes this channel to send feedback information, this channel of time division multiplexing between different HSDPA subscriber equipmenies to Node B.Radio network controller (RNC, Radio Network Controller) when carrying out channel configuration, disposes HS-SCCH and HS-SICH in pairs.
Power control is an important technology of cdma system.Because the cdma system that 3G adopts all is the identical networking mode, therefore can control the interference and the load of whole network by power controlling, power control can also have the near-far interference of overcoming, a series of advantages such as anti-fading in addition.
Ring control and outer shroud control two parts in the control of the closed power of traditional uplink special physical channel (DPCH, Dedicated PhysicalChannel) is divided in the TD-SCDMA system.Inner loop power is controlled at Node B side and finishes, mainly be that the up DPCH demodulation symbol signal interference ratio (SIR) that Node B will measure and suitably handle after (as level and smooth, prediction) compares with the sir target value of setting, the former then is made as " downward modulation " with power control commands word (TPC) by height, and the former is low or both are equal then is made as " rise " with power control commands word (TPC).And being controlled at the RNC side, finishes exterior ring power, mainly be dynamically to set rational sir target value according to the Block Error Rate in the special measurement (BLER) statistics and according to suitable RRM (RRM) algorithm, and dispose B, thereby influence the effect of inner loop power control to Node by system message.
But, for the HS-SICH channel, because the HS-SICH channel does not have the CRC check function, so can't measure and count the Block Error Rate (BLER) of HS-SICH channel at the base station end, so just can not adjust the sir target value, promptly can't carry out the exterior ring power control of HS-SICH channel by the mode of BLER.
Because wireless environment is variable, exterior ring power control is adjusted the sir target value according to the variation of wireless environment changes the received power of HS-SICH, to adapt to the variation of wireless environment, if can not use outer-loop power controlling method, the variation that a rational sir target value adapts to wireless environment just need be set, and when in the wireless environment that is in decline, then need very big sir target value, but this desired value is just very big for general wireless environment.Simultaneously very high sir target value then needs HS-SICH very big transmitting power of needs when emission, will cause the interference very big to other user like this, thereby have influence on the load of network.If but that the sir target value is provided with is big inadequately, then may cause user's call drop.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of uplink closed loop method, base station and radio network controller, for the up shared information channel (HS-SICH) of high speed descending sharing channel (HS-DSCH) provides the exterior ring power controlling schemes, strengthened the performance of HS-SICH channel.
For solving the problems of the technologies described above, the invention provides a kind of uplink closed loop method, comprising:
After high-speed shared information channel (HS-SICH) is received in the base station, calculate the confidence level of this HS-SICH channel, and report to radio network controller (RNC); Described RNC periodically compares the confidence level of described HS-SICH channel with the confidence threshold value of presetting, according to the signal interference ratio desired value in the control of comparative result adjustment HS-SICH channel inner loop power, described base station uses described signal interference ratio desired value to carry out inner loop power control in next inner loop power control cycle.
Further, described RNC is provided with measurement period, and described RNC calculates the average of the confidence level of HS-SICH channel in the described measurement period, and the average of the confidence level of described HS-SICH channel and default confidence threshold value are compared.
Further, the described signal interference ratio desired value of adjusting in the control of HS-SICH channel inner loop power according to comparative result is meant: when the confidence level average of described HS-SICH channel during greater than described confidence threshold value, with step-length of described signal interference ratio desired value downward modulation, otherwise, raise a step-length.
Further, the computing formula of described HS-SICH channel confidence level Z is: Z=(max-cmax)/max, wherein, the maximum likelihood value that max obtains when being decoding, the inferior maximum-likelihood value that cmax obtains when being decoding.
Further, described confidence threshold value is 0.838.
For solving the problems of the technologies described above, the present invention also provides a kind of base station of realizing uplink closed loop, comprises confidence calculations module, reporting module and inner loop power control module, wherein:
Described confidence calculations module is used for calculating the confidence level of this HS-SICH channel after receiving high-speed shared information channel (HS-SICH);
Described reporting module is used for the confidence level that described computing module calculates is reported to described radio network controller (RNC);
Described inner loop power control module is used to receive the signal interference ratio desired value that described RNC sends, and uses described signal interference ratio desired value to carry out inner loop power control in next inner loop power control cycle.
Further, described confidence calculations module is calculated HS-SICH channel confidence level Z:Z=(max-cmax)/max according to following formula, wherein, and the maximum likelihood value that max obtains when being decoding, the inferior maximum-likelihood value that cmax obtains when being decoding.
For solving the problems of the technologies described above, the present invention also provides a kind of radio network controller of realizing uplink closed loop, comprise module, receiver module, signal interference ratio desired value adjusting module and sending module are set, wherein:
The described module that is provided with is used for default confidence threshold value;
Described receiver module is used to receive the confidence level of the high-speed shared information channel that it calculated (HS-SICH) that the base station reports;
Described signal interference ratio desired value adjusting module, the confidence level that is used for the HS-SICH channel that will receive compares with default confidence threshold value, adjusts signal interference ratio desired value in the control of HS-SICH channel inner loop power according to comparative result;
Described sending module is used for adjusted signal interference ratio desired value is sent to the base station.
Further, the described module that is provided with also is used to be provided with measurement period;
Described signal interference ratio desired value adjusting module is used to calculate the average of the confidence level of the HS-SICH channel that receives in the described measurement period, and the average of the confidence level of described HS-SICH channel and default confidence threshold value are compared.
Further, the described signal interference ratio desired value of adjusting in the control of HS-SICH channel inner loop power according to comparative result is meant: when the confidence level average of described HS-SICH channel during greater than described confidence threshold value, with step-length of described signal interference ratio desired value downward modulation, otherwise, raise a step-length.
Compared with prior art, the present invention is incorporated into confidence level in the exterior ring power control mode of HS-SICH channel, has solved the problem that the HS-SICH channel can not carry out exterior ring power control, has strengthened the performance of HS-SICH channel.
Description of drawings
Fig. 1 is the closed power control schematic diagram of HS-SICH channel among the present invention.
Embodiment
Because the HS-SICH channel does not have CRC (Cyclic Redundancy Check) verifying function, it is the Block Error Rate (BLER) that the HS-SICH channel could be measured and count to the base station end, also the situation of change of BLER that just can't be by the HS-SICH channel is come the sir target value in the in good time adjustment inner loop power control, adapts to the variation of wireless environment with this.
Inventive concept of the present invention is: adopt the BLER of the confidence level replacement HS-SICH of HS-SICH channel, be used for adjusting the desired value of the SIR in the inner loop power control.Concrete scheme comprises:
After the HS-SICH channel is received in the base station, calculate the confidence level of this HS-SICH channel, and report to RNC; Described RNC periodically compares the confidence level of described HS-SICH channel with the confidence threshold value of presetting, according to the signal interference ratio desired value in the control of comparative result adjustment HS-SICH channel inner loop power, described base station uses described signal interference ratio desired value to carry out inner loop power control in next inner loop power control cycle.
Preferably, described RNC is provided with measurement period, and described RNC calculates the average of the confidence level of HS-SICH channel in the described measurement period, and the average of the confidence level of described HS-SICH channel and default confidence threshold value are compared.
Preferably, when the confidence level average of described HS-SICH channel during greater than described confidence threshold value, with step-length of described signal interference ratio desired value downward modulation, otherwise, raise a step-length.
Preferably, the computing formula of described HS-SICH channel confidence level Z is: Z=(max-cmax)/max, wherein, the maximum likelihood value that max obtains when being decoding, the inferior maximum-likelihood value that cmax obtains when being decoding.
Below in conjunction with accompanying drawing the present invention is described further.
Utilize the adjustment sir target value that the present invention then can be in good time, adapt to the variation of wireless environment.As shown in Figure 1, may further comprise the steps:
Because HS-SCCH and HS-SICH are paired configurations, so the base station end is when launching the HS-SCCH channel for the first time, all to carry out parameter initialization, comprise: the performance number of the HS-SICH channel that end expectation in base station receives, i.e. SIR_target the HS-SICH channel.The value of described SIR_target can comprehensively be chosen according to the sir target value of different channels, and the SIR_target that promptly chooses will meet the demand of various channels, is example with the TD system, the desirable 9.5dB of reference value.
The HS-SICH channel confidence threshold value that RNC is provided with is represented with confidence level desired value ZXD_target in the present embodiment.The value of described ZXD_target wants the requirement of comprehensive various channels to choose, and need meet the demand of various channels equally, is example with the TD system, reference value desirable 0.838.
The concrete value of above-mentioned SIR_target, ZXD_target can obtain according to emulation, statistics, and the given reference value of present embodiment only is an example.
The measurement period that RNC is provided with, i.e. exterior ring power control adjustment cycle is represented with timing statistics thresholding Th in the present embodiment.The value of described Th can system equipment requirement choose suitable length, be example with the TD system, desirable 50 subframes of reference value.
Described counter comprises the counter sum that is used for the statistical confidence value, and the counter N that is used to add up HS-SICH channel number, and the count initialized device is meant and sum=0 is set, N=0.
Described timer Time is the unit timing with the subframe, is used for judging whether to arrive measurement period for RNC.The initialization timer is meant Time=0 is set.
The inner loop power control of Node B is meant that Node B compares described SIR and SIR_target, if SIR is greater than SIR_target, then generate the power control command word TPC=-1 of HS-SICH channel, expression " downward modulation ", otherwise generate the power control command word TPC=1 of HS-SICH channel, expression " rise ".
Node B calculates the method for confidence level Z value:
The transport block size information RTBS that in the HS-SICH channel, transmits, use 6 bits to transmit, before entering channel, to pass through Reed-Muller (Reed-Miller) and be encoded to 32 bits, and then channel transmits, the base station end carries out RM decoding to 32 bit channels that receive, optional maximum likelihood of interpretation method or FHT (fast Hadamard transform) interpretation method, decoding the time can obtain one group of likelihood value and, choose wherein maximum max and time maximum cmax, calculate confidence level Z value according to following formula:
Z＝(max-cmax)/max
Step 107, RNC receives the confidence value that Node B reports, and establishes sum=sum+Z, N=N+1, Time=Time+1 (1 subframe of 1 expression);
Particularly, RNC calculates the confidence level average that receives in this measurement period, and described confidence level average is compared with the ZXD_target that presets, and adjusts inner loop power Control Parameter SIR_target according to comparative result.Preferably, RNC judges whether N equals 0, if represent that then Node B does not receive the HS-SICH channel in this measurement period, if N is not equal to 0, then calculate confidence level average mean=sum/N, if judge mean≤ZXD_target, then SIR_target is raised step-length, i.e. a SIR_target=SIR_target+delta, otherwise with SIR_target downward modulation step-length, i.e. a SIR_target=SIR_target-delta; The value of described delta is chosen and can be set according to the requirement of equipment, and the desirable 1dB of reference value returns step 103 in the present embodiment, continues the exterior ring power control of next cycle.
The base station of realizing said method comprises confidence calculations module, reporting module and inner loop power control module, wherein:
Described confidence calculations module is used for after receiving HS-SICH, calculates the confidence level of this HS-SICH channel;
Described reporting module is used for the confidence level that described computing module calculates is reported to described RNC;
Described inner loop power control module is used to receive the signal interference ratio desired value that described RNC sends, and uses described signal interference ratio desired value to carry out inner loop power control in next inner loop power control cycle.
Wherein: described confidence calculations module is calculated HS-SICH channel confidence level Z:Z=(max-cmax)/max according to following formula, wherein, and the maximum likelihood value that max obtains when being decoding, the inferior maximum-likelihood value that cmax obtains when being decoding.
The radio network controller of realizing said method comprises module, receiver module, signal interference ratio desired value adjusting module and sending module is set, wherein:
The described module that is provided with is used for default confidence threshold value;
Described receiver module is used to receive the confidence level of the HS-SICH that it calculated that the base station reports;
Described signal interference ratio desired value adjusting module, the confidence level that is used for the HS-SICH channel that will receive compares with default confidence threshold value, adjusts signal interference ratio desired value in the control of HS-SICH channel inner loop power according to comparative result;
Described sending module is used for adjusted signal interference ratio desired value is sent to the base station.
Preferably:
The described module that is provided with also is used to be provided with measurement period;
Described signal interference ratio desired value adjusting module is used to calculate the average of the confidence level of the HS-SICH channel that receives in the described measurement period, and the average of the confidence level of described HS-SICH channel and default confidence threshold value are compared.
Need to prove that if do not conflict, each feature among the embodiment of the invention and the embodiment can mutually combine, all within protection scope of the present invention.In addition, can in computer system, carry out in the step shown in the flow chart of accompanying drawing such as a set of computer-executable instructions, and, though there is shown logical order in flow process, but in some cases, can carry out step shown or that describe with the order that is different from herein.
For example, the unit of account of Th and Time should be identical, all is in subframe, perhaps all in ms.
Again for example, when judging that parameter equates with threshold value, can not process, as long as interior ring is consistent with the operation of external circule power control method yet.
Claims (10)
1. uplink closed loop method comprises:
After high-speed shared information channel (HS-SICH) is received in the base station, calculate the confidence level of this HS-SICH channel, and report to radio network controller (RNC); Described RNC periodically compares the confidence level of described HS-SICH channel with the confidence threshold value of presetting, according to the signal interference ratio desired value in the control of comparative result adjustment HS-SICH channel inner loop power, described base station uses described signal interference ratio desired value to carry out inner loop power control in next inner loop power control cycle.
2. the method for claim 1 is characterized in that,
Described RNC is provided with measurement period, and described RNC calculates the average of the confidence level of HS-SICH channel in the described measurement period, and the average of the confidence level of described HS-SICH channel and default confidence threshold value are compared.
3. method as claimed in claim 2 is characterized in that,
The described signal interference ratio desired value of adjusting in the control of HS-SICH channel inner loop power according to comparative result is meant: when the confidence level average of described HS-SICH channel during greater than described confidence threshold value, with step-length of described signal interference ratio desired value downward modulation, otherwise, raise a step-length.
4. as claim 1 or 2 or 3 described methods, it is characterized in that,
The computing formula of described HS-SICH channel confidence level Z is:
Z＝(max-cmax)/max
Wherein, the maximum likelihood value that max obtains when being decoding, the inferior maximum-likelihood value that cmax obtains when being decoding.
5. as claim 1 or 2 or 3 described methods, it is characterized in that,
Described confidence threshold value is 0.838.
6. a base station of realizing uplink closed loop comprises confidence calculations module, reporting module and inner loop power control module, wherein:
Described confidence calculations module is used for calculating the confidence level of this HS-SICH channel after receiving high-speed shared information channel (HS-SICH);
Described reporting module is used for the confidence level that described computing module calculates is reported to described radio network controller (RNC);
Described inner loop power control module is used to receive the signal interference ratio desired value that described RNC sends, and uses described signal interference ratio desired value to carry out inner loop power control in next inner loop power control cycle.
7. base station as claimed in claim 6 is characterized in that,
Described confidence calculations module is calculated HS-SICH channel confidence level Z according to following formula:
Z＝(max-cmax)/max
Wherein, the maximum likelihood value that max obtains when being decoding, the inferior maximum-likelihood value that cmax obtains when being decoding.
8. a radio network controller of realizing uplink closed loop comprises module, receiver module, signal interference ratio desired value adjusting module and sending module are set, wherein:
The described module that is provided with is used for default confidence threshold value;
Described receiver module is used to receive the confidence level of the high-speed shared information channel that it calculated (HS-SICH) that the base station reports;
Described signal interference ratio desired value adjusting module, the confidence level that is used for the HS-SICH channel that will receive compares with default confidence threshold value, adjusts signal interference ratio desired value in the control of HS-SICH channel inner loop power according to comparative result;
Described sending module is used for adjusted signal interference ratio desired value is sent to the base station.
9. radio network controller as claimed in claim 8 is characterized in that,
The described module that is provided with also is used to be provided with measurement period;
Described signal interference ratio desired value adjusting module is used to calculate the average of the confidence level of the HS-SICH channel that receives in the described measurement period, and the average of the confidence level of described HS-SICH channel and default confidence threshold value are compared.
10. radio network controller as claimed in claim 8 or 9 is characterized in that,
The described signal interference ratio desired value of adjusting in the control of HS-SICH channel inner loop power according to comparative result is meant: when the confidence level average of described HS-SICH channel during greater than described confidence threshold value, with step-length of described signal interference ratio desired value downward modulation, otherwise, raise a step-length.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111211873A (en) * | 2020-01-13 | 2020-05-29 | 华南师范大学 | Signal processing method based on redundant remainder system code |
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| CN101132389A (en) * | 2007-09-26 | 2008-02-27 | 中兴通讯股份有限公司 | Compensation method for estimation of signal to interference ratio |
| CN101179307A (en) * | 2006-11-07 | 2008-05-14 | 中兴通讯股份有限公司 | Downlink power control method and system |
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| CN1750428A (en) * | 2005-11-02 | 2006-03-22 | 中兴通讯股份有限公司 | High speed shared control channels and method for realizing high speed shared information channel power |
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| CN111211873A (en) * | 2020-01-13 | 2020-05-29 | 华南师范大学 | Signal processing method based on redundant remainder system code |
| CN111211873B (en) * | 2020-01-13 | 2022-10-04 | 华南师范大学 | Signal processing method based on redundant remainder system code |
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