CN100388644C - Method of uplink power control during discontinuous uplink emission in radio communication system - Google Patents
Method of uplink power control during discontinuous uplink emission in radio communication system Download PDFInfo
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- CN100388644C CN100388644C CNB2006100040413A CN200610004041A CN100388644C CN 100388644 C CN100388644 C CN 100388644C CN B2006100040413 A CNB2006100040413 A CN B2006100040413A CN 200610004041 A CN200610004041 A CN 200610004041A CN 100388644 C CN100388644 C CN 100388644C
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Abstract
The present invention discloses an uplink power controlling method in a wireless communication system during uplink discontinuous transmission, which specifically comprises that: step one, a base station utilizes a special burst received during the uplink discontinuous transmission to judge the communication quality of an up link; step two, according to the judgment result of the communication quality of the up link in step one, the base station generates a corresponding power control command; step three, the base station sends down the generated power control command to user equipment; step four, through the power control command sent down by the base station, the user equipment calculates the initial power compensation amount of an uplink signal after an uplink special burst or uplink data is transmitted again; step five, according to the calculation result in step four, the user equipment adjusts the transmitting power of the uplink special burst or the initial transmitting power of the uplink signal after the uplink data is transmitted again. The method of the present invention enhances uplink power control precision during the uplink discontinuous transmission in the wireless communication system.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to upper non-continuous power control in a kind of wireless communication system.
Background technology
The closed power control technology is widely used in UTRA (Universal Telecommunication RadioAccess) FDD and UTRA (Universal Telecommunication Radio Access) TDD3.84/1.28Mcps system, in the closed power controlling mechanism, subscriber equipment/base station is according to periodically adjusting transmitting power from the entrained power control command of the based on feedback link of base station/user equipment.
In the uplink power control process, after the base station receives signal from subscriber equipment, whether need to increase or reduce the transmitting power of subscriber equipment according to SIR (signal interference ratio) measured value decision, and produce corresponding power control command upward signal.The base station passes to subscriber equipment with power control command by descending feedback channel, and subscriber equipment is adjusted uplink transmission power after receiving power control command.
For UTRA TDD system, when if the high level of base station or subscriber equipment does not have data to offer coded combination transmission channel (CCTrCH) in Transmission Time Interval (TTI), base station and subscriber equipment can be that unit implements discontinuous emission (DTX) with the coded combination transmission channel.When discontinuous emission acts on certain CCTrCH, this CCTrCH stops conventional data transmission, change into certain cycle emission special burst (SBs, Special Bursts), the up SB emission cycle is called SBGP (special burst generationperiod), and the descending SB emission cycle is called SBSP (special burst scheduling period).The enforcement of discontinuous emission eats dishes without rice or wine to disturb, save equipment energy consumption to minimizing and implement between the frequency of wireless system/and switch between system positive role is arranged.
For UTRA TDD3.84/1.28Mcps system, when discontinuous emission acts on up CCTrCH, can exert an influence for up closed-loop power control.Because up CCTrCH is in discontinuous emitting state, in up discontinuous when emission,, the base station can only receive SBs with the cycle of SBGP radio frames, and at this moment the base station can't be according to according to SBs power during the closed-loop fashion control DTX of routine and the initial upstream data power after the DTX end.
In the up discontinuous emission process, subscriber equipment generally can only determine that up SBs or upstream data recover the initial upward signal transmitting power in back by the mode that user equipment side is carried out open loop power control, the power control error of this up open Loop Power control mode is bigger, and the reliability that the uplink performance during the DTX and link are kept is easy to generate adverse effect.
Summary of the invention
The technical problem that the present invention solves provides upper non-continuous power control in a kind of wireless communication system, overcomes the shortcoming that the power control error is big in the prior art, link performance is low, reliability is low.
In order to address the above problem, upper non-continuous power control in the wireless communication system provided by the invention specifically may further comprise the steps:
Step 1, base station utilize the special burst that receives during the up discontinuous emission to judge the communication quality of up link;
Step 2, the base station produces corresponding power control command according to the uplink communication quality judged result in the step 1;
Step 3, subscriber equipment is handed down to the power control command that generates in the base station;
Step 4, the power control command that subscriber equipment issues by the base station are calculated the power back-off amount that up special burst or upstream data recover the initial upward signal in emission back;
Step 5, according to the result of calculation of step 4, subscriber equipment is adjusted the transmitting power of up special burst or the transmitting power that upstream data recovers the initial upward signal in emission back.
Can see by technique scheme, in communication process, the uplink power control process when method of the present invention has realized up DTX with the closed loop means.The open loop uplink power control method of method of the present invention during with respect to up DTX, the uplink power control precision when having strengthened up discontinuous emission in the wireless communication system.Especially for SBGP cycle of up discontinuous emission hour, above-mentioned Poewr control method is with respect to open loop uplink power control method, the uplink performance during to up DTX improves a lot.
Description of drawings
Fig. 1 is the flow chart of the inventive method
Embodiment
Below in conjunction with accompanying drawing specific implementation of the present invention is made and to be further described.
Be the flow chart of the inventive method as shown in Figure 1, concrete steps are as follows:
Step 1: the base station utilizes the SBs that receives during the DTX to judge the communication quality of up link;
Step 2: the corresponding power control command of generation is judged according to the uplink communication quality in the step 1 in the base station;
Step 3: subscriber equipment is handed down to the power control command that generates in the base station;
Step 4: the power control command that subscriber equipment issues by the base station calculates the power back-off amount that up SBs or upstream data recover the initial upward signal in back;
Step 5: according to the result of calculation of step 4, subscriber equipment is suitably adjusted the transmitting power of up SBs or the transmitting power that upstream data recovers the initial upward signal in back.
Said method is implemented respectively the CCTrCH of each up DTX in the system by base station, subscriber equipment.
Above-mentioned algorithm steps is implemented to finish the process of uplink closed loop the CCTrCH of each up DTX in the system circularly continuously by base station, subscriber equipment.
Above-mentioned step 1,2 can have multiple specific implementation method, now is exemplified below.
Scheme one:
The base station judges that the communication quality of up link comprises that the power of judging up link need increase still minimizing in the step 1.Specifically comprise: if the up link signal interference ratio of base station measurement, judges then that the power of up link should increase less than the target signal interference ratio; If the up link signal interference ratio of base station measurement equals the target signal interference ratio, judge that then the power of up link should remain unchanged; If the up link signal interference ratio of base station measurement, judges then that the power of up link should reduce greater than the target signal interference ratio.
Step 2 comprises specifically that if the power of up link should increase then the base station produces the power control command Up (1) that increases power; If the power of up link should remain unchanged, then the base station produces the power control command Do nothing (0) that power remains unchanged; If the power of up link should reduce, then the base station produces the power control command Down (1) that reduces power.
Scheme two:
The base station judges that the communication quality of up link comprises that the base station directly calculates the quantity that the power of up link need be adjusted, i.e. the up link SIR of the power adjustment=target SIR of up link-measurement in the step 1;
Step 2 specifically comprises if the power adjustment of up link is P, and the power control step-length that base station and subscriber equipment are decided through consultation in advance is Step, then
If greater than 0, then the base station produces the power control command Up (1) of a N continuous increase power to the absolute value of P more than or equal to Step and P value;
If the absolute value of P less than 0, produces the power control command Down (1) of a N continuous minimizing power more than or equal to Step and P value;
If the absolute value of P less than Step, produces the power control command Donothing (0) that a power remains unchanged;
Wherein
|| be the signed magnitude arithmetic(al) symbol,
Be last rounding operation symbol.
In the above-mentioned step 3, comprise that specifically each Up power control command that step 2 is produced is mapped as physical layer power control bit TCPbit (1) respectively, each Down power control command that step 2 is produced is mapped as physical layer power control bit TCPbit (1) respectively, and each Do nothing power control command that step 2 is produced is mapped as physical layer power control bit TCPbit (0) respectively.As if the power control bit number that the physical layer power control bit number through above-mentioned mapping gained can send less than physical layer, insufficient section is supplied with TCPbit (0).Mapping and supply after physical layer power control bit send to subscriber equipment according to position and the modulation format that physical layer requires.
The wireless system that has only TCPbit (1) and TCPbit (1) for physical layer power control bits such as UTRA TDD 1.28Mcps, the method of step 3 comprises that also each Up power control command that step 2 is produced is mapped as physical layer power control bit TCPbit (1) respectively, each Down power control command of step 2 generation is mapped as the power control bit TCPbit (1) of physical layer respectively, each Do nothing power control command that step 2 is produced is mapped to a radio frames (frame), the power control bit of two subframes (subframe) of this radio frames is respectively the form of TCPbit (1) and TCPbit (1), and replaces issuing of Donothing (0) power control command with issuing of this frame.As if the power control bit number that the physical layer power control bit number through above-mentioned mapping gained can send less than physical layer, insufficient section is supplied with the sequence that TCPbit (1) and TCPbit (1) replace.Mapping and supply after physical layer power control bit send to subscriber equipment according to position and the modulation format that physical layer requires.
Have only TCPbit (1) and TCPbit (1) and DTX with radio frames (frame for physical layer power control bits such as UTRA TDD 1.28Mcps, 10ms) for cycle physical layer power control command with subframe (subframe, the system that 5ms) issues, it is that the power control command of a N continuous non-Do nothing and N are when being odd number that the method for step 3 also comprises when what produce in the step 2, preceding N-1 power control command of this N continuous power control command is mapped as N-1 physical layer power control bit, last power control command of this N continuous power control command is mapped as two same physical layer power control bits.As if the power control bit number that the physical layer power control bit number through above-mentioned mapping gained can send less than physical layer, insufficient section is supplied with the sequence that TCPbit (1) and TCPbit (1) replace.Mapping and supply after physical layer power control bit send to subscriber equipment according to position and the modulation format that physical layer requires.
In the above-mentioned step 4, the method of " subscriber equipment calculates the transmitting power of up SBs or the compensation rate that upstream data recovers the transmitting power of the initial upward signal in back by descending power control command " comprising: subscriber equipment receives the physical layer power control bit that the base station issues, and the computational methods of the compensation rate of this ascending power are:
Wherein M for from the base station according to the descending sub frame at last up power control command that SBs calculated of subscriber equipment and the related physical layer mapping place number of subframes in the scope of this up previous descending sub frame; TPCbit
iFor subscriber equipment from the base station according to the physical layer power control bit that receives the descending sub frame at last up power control command that SBs calculated of subscriber equipment and related physical layer mapping place i the subframe in the scope of this up previous descending sub frame; Step for step 2 in base station and the subscriber equipment identical value of power control step-length Step of deciding through consultation in advance.
In the above-mentioned steps 5, the method for " according to the result of calculation of step 4, subscriber equipment is suitably adjusted the transmitting power of up SBs or the transmitting power that upstream data recovers the initial upward signal in back " comprising:
P
ul，i＝P
ul，i-1+SumTPC
P wherein
Ul, iBeing the transmitting power of this upward signal, can be the transmitting power of first physical code channel of the transmitting power of this up SBs or the CCTrCH that upstream data recovers initial upward signal place, back; P
Ul, i-1It is the transmitting power of up SBs of last time; SumTPC is the power back-off amount of the upward signal that calculates in the step 4.
Claims (18)
1. upper non-continuous power control in the wireless communication system is characterized in that, may further comprise the steps:
Step 1, base station utilize the special burst that receives during the up discontinuous emission to judge the communication quality of up link;
Step 2, the base station produces corresponding power control command according to the uplink communication quality judged result in the step 1;
Step 3, subscriber equipment is handed down to the power control command that generates in the base station;
Step 4, the power control command that subscriber equipment issues by the base station are calculated the power back-off amount that up special burst or upstream data recover the initial upward signal in emission back;
Step 5, according to the result of calculation of step 4, subscriber equipment is adjusted the transmitting power of up special burst or the transmitting power that upstream data recovers the initial upward signal in emission back.
2. the method for claim 1 is characterized in that, the base station judges that the communication quality of up link comprises that the power of judging up link needs to increase, remains unchanged and still reduce in the described step 1.
3. method as claimed in claim 2 is characterized in that, the base station judges that the communication quality of up link comprises in the described step 1:
If the up link signal interference ratio of base station measurement, judges then that the power of up link should increase less than the target signal interference ratio;
If the up link signal interference ratio of base station measurement equals the target signal interference ratio, judge that then the power of up link should remain unchanged;
If the up link signal interference ratio of base station measurement, judges then that the power of up link should reduce greater than the target signal interference ratio.
4. as claim 2 or 3 described methods, it is characterized in that described step 2 specifically comprises:
If the power of up link should increase, then the base station produces the power control command that increases power;
If the power of up link should remain unchanged, then the base station produces the power control command that power remains unchanged;
If the power of up link should reduce, then the base station produces the power control command that reduces power.
5. the method for claim 1 is characterized in that, the base station judges that the communication quality of up link comprises that the base station directly calculates the quantity that the power of up link need be adjusted in the described step 1.
6. method as claimed in claim 5, it is characterized in that, in the described step 1 base station judge the communication quality of up link comprise the base station according to target signal interference ratio and base station measurement to the difference of up link signal interference ratio calculate the quantity that the power of up link need be adjusted.
7. as claim 5 or 6 described methods, it is characterized in that described step 2 specifically comprises:
If the power adjustment of up link is P, the power control step-length that base station and subscriber equipment are decided through consultation in advance is Step, then
If greater than 0, then the base station produces the power control command of a N continuous increase power to the absolute value of P more than or equal to Step and P value;
If less than 0, then the base station produces the power control command of a N continuous minimizing power to the absolute value of P more than or equal to Step and P value;
If the absolute value of P is less than Step, then the base station produces the power control command that power remains unchanged;
Wherein
|| be the signed magnitude arithmetic(al) symbol,
Be last rounding operation symbol.
8. the method for claim 1, it is characterized in that, described step 3 comprises that specifically the base station is mapped as the power control bit of physical layer with described power control command, and physical layer power control bit is sent to subscriber equipment according to position and the modulation format that physical layer requires.
9. method as claimed in claim 8 is characterized in that, the power control bit number that the physical layer power control bit number of described mapping gained can send less than physical layer, and then insufficient section is supplied with the constant power control bit of holding power.
10. method as claimed in claim 9, it is characterized in that, if have only the power control bit of power lifting/lowering in the described wireless communication system, and the power control command that the base station need issue is when to be holding power constant, the base station is mapped to a radio frames with this power control command, the power control bit of two subframes of this radio frames is respectively the power control bit of power liter and the form of the power control bit that power falls, and replaces issuing of the constant power control command of holding power with issuing of this frame.
11. method as claimed in claim 10, it is characterized in that, if through the power control bit number that the physical layer power control bit number of described mapping gained can send less than physical layer, the sequence that the power control bit that power control bit that insufficient section rises with power and power fall replaces is supplied.
12. method as claimed in claim 9, it is characterized in that, if have only the power control bit of power lifting/lowering in the described wireless communication system, and discontinuous emission is cycle and the physical layer power control command issues with subframe with the radio frames, the base station need issue the power control command of N power lifting/lowering, when wherein N is odd number, preceding N-1 power control command of this N continuous power control command is mapped as N-1 physical layer power control bit, last power control command of this N continuous power control command is mapped as two same physical layer power control bits.
13. method as claimed in claim 12, it is characterized in that, if through the power control bit number that the physical layer power control bit number of described mapping gained can send less than physical layer, the sequence that the power control bit that power control bit that insufficient section rises with power and power fall replaces is supplied.
14. the method for claim 1, it is characterized in that, described step 4 rated output compensation rate comprises from the base station descending sub frame according to the last up power control command place that special burst calculated of subscriber equipment in the scope of the previous descending sub frame of this up emission, and subscriber equipment calculates the power back-off amount of corresponding this upward signal according to the base station power control command that each subframe issues in above-mentioned scope.
15. method as claimed in claim 14 is characterized in that, the formula of described rated output compensation rate is:
Wherein M for from the base station according to the descending sub frame at last up power control command that special burst calculated of subscriber equipment and the related physical layer mapping place number of subframes in the scope of this up previous descending sub frame; TPCbit
iFor subscriber equipment from the base station according to the physical layer power control bit that receives the descending sub frame at last up power control command that special burst calculated of subscriber equipment and related physical layer mapping place i the subframe in the scope of this up previous descending sub frame; Step is the power control step-length that base station and subscriber equipment are decided through consultation in advance.
16. method as claimed in claim 15 is characterized in that, the formula that described step 5 subscriber equipment is adjusted power is:
P
ul，i＝P
ul，i-1+SumTPC
P wherein
Ul, iBeing the transmitting power of this upward signal, is the transmitting power of first physical code channel of the transmitting power of this up special burst or the coded combination transmission channel that upstream data recovers initial upward signal place, emission back; P
Ul, i-1It is the transmitting power of up special burst of last time; SumTPC is the power back-off amount of the upward signal that calculates in the step 4.
17. the method for claim 1 is characterized in that, described Poewr control method is by base station, subscriber equipment the coded combination transmission channel of each up discontinuous emission in the system to be implemented respectively.
18. the method for claim 1, it is characterized in that described Poewr control method is by base station, subscriber equipment the coded combination transmission channel of each up discontinuous emission in the system to be implemented circularly continuously to finish the process of uplink closed loop.
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| CN101277132B (en) * | 2007-03-26 | 2013-06-05 | 华为技术有限公司 | Method and equipment for acquiring emitting power of upstream data |
| CN101282145B (en) * | 2007-04-06 | 2013-02-13 | 鼎桥通信技术有限公司 | Method and apparatus for controlling transmission power and synchronization in TD-SCDMA system |
| CN102271389B (en) * | 2010-06-04 | 2014-03-19 | 中兴通讯股份有限公司 | Uplink power control method and system |
| CN105451313A (en) * | 2014-07-31 | 2016-03-30 | 展讯通信（上海）有限公司 | Power compensation system and method and mobile terminal |
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