CN101888691A - Outer loop power adjusting method and device - Google Patents
Outer loop power adjusting method and device Download PDFInfo
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- CN101888691A CN101888691A CN2010102341784A CN201010234178A CN101888691A CN 101888691 A CN101888691 A CN 101888691A CN 2010102341784 A CN2010102341784 A CN 2010102341784A CN 201010234178 A CN201010234178 A CN 201010234178A CN 101888691 A CN101888691 A CN 101888691A
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Abstract
The invention provides an outer loop power adjusting method, which comprises that: when the channel quality is lower than a preset first quality threshold and an outer loop accumulating index adjusts a channel quality indicator (CQI) downwards, a base station performs dispatching by using the CQI reported by user equipment to obtain high-speed physical downlink sharing channel (HS-PDSCH) sending power. The invention also provides an outer loop power adjusting device, which is used for performing dispatching by using the CQI reported by the user equipment to obtain the HS-PDSCH sending power when the channel quality is lower than the preset first quality threshold and the outer loop accumulating index adjusts the CQI downwards. The method and the device furthest improve the HSDPA and HSPA+ user throughput and improve the user experience by detecting the current channel condition, avoiding downwards adjusting the CQI when the channel quality is poor and sacrificing a certain BLER.
Description
Technical field
The present invention relates to mobile communication system, relate in particular to a kind of outer loop power adjusting method and device among the follow-up evolution HSPA of WCDMA (Wideband Code Division Multiple Access (WCDMA)) (high-speed packet access)+MIMO (Multiple Input Multiple Output, multiple-input and multiple-output).
Background technology
In HSDPA (high speed downlink packet access) and HSPA+, in order to follow the tracks of the variation of channel condition fast and effectively, alleviate the measure error of CQI (Channel QualityIndicator, channel quality indication), Node B (base station) adopts the outer shroud link adaptation techniques.The outer shroud method of adjustment is utilized the decode results of ACK/NACK (affirmation/non-affirmation), by keeping BLER (Block Error Ratio, Block Error Rate or bLock error rate) near target BLER, last mediation downward modulation CQI selects TBS (Transport Block Size, the transmission block size), thus guarantee user's throughput.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of outer loop power adjusting method and device, guarantees the bigger throughput of user, improves user's impression.
In order to address the above problem, the invention provides a kind of outer loop power adjusting method, comprising:
When channel quality was lower than first default quality threshold and outer shroud accumulative total indication downward modulation channel quality indication (CQI), base station side used the CQI of user equipment to report to dispatch, and obtains high-speed physical downlink shared channel (HS-PDSCH) (HS-PDSCH) transmitted power.
Further, described method also comprises:
When channel quality was higher than second default quality threshold and outer shroud accumulative total indication rise CQI, base station side raised CQI, uses adjusted CQI to dispatch, and obtains the HS-PDSCH transmitted power.
Further, said method also can have following characteristics, when channel quality is higher than second default quality threshold and outer shroud accumulative total indication rise CQI, if there was dump power the sub-district after base station side used adjusted CQI scheduling to finish, then carry out power back-off, obtain the final transmitted power of HS-PDSCH.
Further, said method also can have following characteristics, the HS-PDSCH transmitted power that the final transmitted power of described HS-PDSCH is obtained by scheduling raises an adjusted value and obtains, described adjusted value is the smaller value in adjusting power and the sub-district dump power on the maximum admissible, wherein, adjusting power is on the described maximum admissible: the basic HS-PDSCH transmitted power that common pilot channel power+maximum pilot power available offset values-described scheduling obtains.
Further, said method also can have following characteristics, and channel quality is positioned at default mass range and outer shroud accumulative total is indicated when not adjusting CQI, and base station side uses the CQI of user equipment to report to dispatch, and obtains the HS-PDSCH transmitted power.
The present invention also provides a kind of exterior ring power adjusting device, described exterior ring power adjusting device, be used for when channel quality is lower than first default quality threshold and outer shroud accumulative total indication downward modulation channel quality indication (CQI), use the CQI of user equipment to report to dispatch, obtain high-speed physical downlink shared channel (HS-PDSCH) (HS-PDSCH) transmitted power.
Further, said apparatus also can have following characteristics, described exterior ring power adjusting device, also be used for when channel quality is higher than second default quality threshold and outer shroud accumulative total indication rise CQI, raise CQI, use adjusted CQI to dispatch, obtain the HS-PDSCH transmitted power.
Further, said apparatus also can have following characteristics, described exterior ring power adjusting device, be to be used for when channel quality is higher than second default quality threshold and outer shroud accumulative total indication rise CQI, if there is dump power the sub-district after using adjusted CQI scheduling to finish, then carry out power back-off, obtain the final transmitted power of HS-PDSCH.
Further, said apparatus also can have following characteristics, described exterior ring power adjusting device, be used for that the described HS-PDSCH transmitted power that scheduling obtains is raised an adjusted value and obtain the final transmitted power of described HS-PDSCH, described adjusted value is the smaller value in adjusting power and the sub-district dump power on the maximum admissible, wherein, adjusting power is on the described maximum admissible: the basic HS-PDSCH transmitted power that common pilot channel power+maximum pilot power available offset values-described scheduling obtains.
Further, said apparatus also can have following characteristics, and described exterior ring power adjusting device also is used for when channel quality is positioned at the indication of default mass range and outer shroud accumulative total and does not adjust CQI, use the CQI of user equipment to report to dispatch, obtain the HS-PDSCH transmitted power.
The method of the invention and device by detecting current channel condition, are not adjusted CQI downwards when bad channel quality, sacrifice certain BLER and improve HSDPA and HSPA+ user throughput to greatest extent, improve user's impression.
Description of drawings
Fig. 1 is the embodiment of the invention one flow chart;
Fig. 2 is the embodiment of the invention two flow charts;
Fig. 3 is the embodiment of the invention three flow charts.
Embodiment
HSDPA and HSPA+ user's throughput is directly proportional with the TBS of selection, is inversely proportional to BLER.And under certain channel condition, TBS is big more, and BLER also can increase.MIMO is under different channel conditions, and TBS is different to the influence of throughput with BLER.
In order to control TBS and BLER maintains optimum state, thereby reach user's maximum throughput, the present invention proposes under a kind of MIMO and guarantee the BLER method of adjustment once more at preferential raising HSDPA throughput, main thought is under different channel conditions, maximum throughput with the pursuit user is a prerequisite, adjust TBS and BLER, thereby improve user's impression.
Outer loop power adjusting method provided by the invention comprises:
When 1) current channel quality was lower than first default quality threshold and outer shroud accumulative total indication downward modulation CQI, the base station side outer shroud was not adjusted CQI downwards, and the CQI that uses UE to report dispatches and obtains the HS-PDSCH transmitted power.When channel-quality feedback is relatively poor, do not keep bigger TBS by cutting CQI, sacrifice certain BLER, UE obtains bigger throughput.
When 2) current channel quality was positioned at default mass range and the indication of outer shroud accumulative total and does not adjust CQI, the CQI that base station side uses UE to report selected the TBS scheduling, obtains the HS-PDSCH transmitted power.Under this situation, channel-quality feedback is stable, does not adjust CQI, maintains target BLER, and UE obtains bigger throughput.
When 3) channel quality was higher than second default quality threshold and outer shroud accumulative total indication rise CQI, base station side raised CQI, uses adjusted CQI to dispatch, and obtains the HS-PDSCH transmitted power; If there was dump power the sub-district after scheduling was finished, then carry out power back-off, obtain the final transmitted power of HS-PDSCH.Wherein, the HS-PDSCH transmitted power that the final transmitted power of described HS-PDSCH is obtained by described scheduling raises an adjusted value and obtains, described adjusted value is the smaller value in adjusting power and the sub-district dump power on the maximum admissible, wherein, adjusting power is on the described maximum admissible: the basic HS-PDSCH transmitted power that common pilot channel power+maximum pilot power available offset values-described scheduling obtains.
Under this situation, current channel-quality feedback is better, and MIMO UE outer shroud raises CQ1 and selects bigger TBS, simultaneously by suitable power back-off, thereby reduces BLER, makes UE reach bigger throughput.
Further specify the present invention below in conjunction with drawings and Examples.
Figure 1 shows that the embodiment of the invention one, feed back processing when relatively poor, comprising at channel condition:
The indication of outer shroud accumulative total is the accumulative total of UE feedback (ACK/NACK) feedback before each scheduling, is base station side oneself statistics.Whether the CQI of outer shroud aggregate-value indication current scheduling adjusts, and what are adjusted, and uses for the base station side current scheduling.
Among this embodiment, because CQI does not cut, the TBS that select this moment is bigger, obtains bigger throughput.
Figure 2 shows that the embodiment of the invention two, the processing when the channel condition feedback stability comprises:
In the present embodiment, select TBS with current CQI scheduling, the outer shroud balance maintains target BLER, obtains bigger throughput.
Figure 3 shows that the embodiment of the invention three, feed back processing when better, comprising at channel condition:
Wherein, the final transmitted power of HS-PDSCH raises an adjusted value by the HS-PDSCH transmitted power that obtains of scheduling in the step 340 and obtains, and this adjusted value is a less value in adjusting power and the sub-district dump power on the maximum admissible.
Adjusting power is the HS-PDSCH transmitted power that basic Common Pilot Channel (PCPICH) power+the MPO-scheduling obtains on the maximum admissible.Described MPO (Measure Power Offset measures power excursion) is the maximum pilot power available offset values that Node B side is provided with.The MPO of Node B configuration is more bigger than the MPO of radio network controller (RNC) configuration.
Among this embodiment, select bigger TBS owing to adjust upward CQI, thereby power back-off reduces BLER simultaneously, makes UE reach bigger throughput.
The present invention also provides a kind of exterior ring power adjusting device, described exterior ring power adjusting device, be used for when channel quality is lower than first default quality threshold and outer shroud accumulative total indication downward modulation CQI, use the CQI of user equipment to report to dispatch, obtain high-speed physical downlink shared channel (HS-PDSCH) (HS-PDSCH) transmitted power.
Wherein, described exterior ring power adjusting device also is used for raising CQI when channel quality is higher than second default quality threshold and outer shroud accumulative total indication rise CQI, uses adjusted CQI to dispatch, and obtains the HS-PDSCH transmitted power; Wherein,, then carry out power back-off, obtain the final transmitted power of HS-PDSCH if there was dump power the sub-district after scheduling was finished.
Wherein, described exterior ring power adjusting device, the HS-PDSCH transmitted power that is used for that described scheduling is obtained raises an adjusted value and obtains the final transmitted power of described HS-PDSCH, described adjusted value is the smaller value in adjusting power and the sub-district dump power on the maximum admissible, wherein, adjusting power is on the described maximum admissible: the basic HS-PDSCH transmitted power that common pilot channel power+maximum pilot power available offset values-described scheduling obtains.
Wherein, described exterior ring power adjusting device also is used for using the CQI of user equipment to report to dispatch when channel quality is positioned at the indication of default mass range and outer shroud accumulative total and does not adjust CQI, obtains the HS-PDSCH transmitted power.
Claims (10)
1. an outer loop power adjusting method is characterized in that, comprising:
When channel quality was lower than first default quality threshold and outer shroud accumulative total indication downward modulation channel quality indication (CQI), base station side used the CQI of user equipment to report to dispatch, and obtains high-speed physical downlink shared channel (HS-PDSCH) (HS-PDSCH) transmitted power.
2. the method for claim 1 is characterized in that, described method also comprises:
When channel quality was higher than second default quality threshold and outer shroud accumulative total indication rise CQI, base station side raised CQI, uses adjusted CQI to dispatch, and obtains the HS-PDSCH transmitted power.
3. method as claimed in claim 2, it is characterized in that, when channel quality is higher than second default quality threshold and outer shroud accumulative total indication rise CQI, if there was dump power the sub-district after base station side used adjusted CQI scheduling to finish, then carry out power back-off, obtain the final transmitted power of HS-PDSCH.
4. method as claimed in claim 3 is characterized in that,
The HS-PDSCH transmitted power that the final transmitted power of described HS-PDSCH is obtained by scheduling raises an adjusted value and obtains, described adjusted value is the smaller value in adjusting power and the sub-district dump power on the maximum admissible, wherein, adjusting power is on the described maximum admissible: the basic HS-PDSCH transmitted power that common pilot channel power+maximum pilot power available offset values-described scheduling obtains.
5. as the arbitrary described method of claim 1 to 4, it is characterized in that,
Channel quality is positioned at default mass range and outer shroud accumulative total is indicated when not adjusting CQI, and base station side uses the CQI of user equipment to report to dispatch, and obtains the HS-PDSCH transmitted power.
6. an exterior ring power adjusting device is characterized in that,
Described exterior ring power adjusting device, be used for when channel quality is lower than first default quality threshold and outer shroud accumulative total indication downward modulation channel quality indication (CQI), use the CQI of user equipment to report to dispatch, obtain high-speed physical downlink shared channel (HS-PDSCH) (HS-PDSCH) transmitted power.
7. device as claimed in claim 6 is characterized in that,
Described exterior ring power adjusting device also is used for raising CQI when channel quality is higher than second default quality threshold and outer shroud accumulative total indication rise CQI, uses adjusted CQI to dispatch, and obtains the HS-PDSCH transmitted power.
8. device as claimed in claim 7, it is characterized in that, described exterior ring power adjusting device, be to be used for when channel quality is higher than second default quality threshold and outer shroud accumulative total indication rise CQI, if there is dump power the sub-district after using adjusted CQI scheduling to finish, then carry out power back-off, obtain the final transmitted power of HS-PDSCH.
9. device as claimed in claim 8 is characterized in that,
Described exterior ring power adjusting device, be used for that the described HS-PDSCH transmitted power that scheduling obtains is raised an adjusted value and obtain the final transmitted power of described HS-PDSCH, described adjusted value is the smaller value in adjusting power and the sub-district dump power on the maximum admissible, wherein, adjusting power is on the described maximum admissible: the basic HS-PDSCH transmitted power that common pilot channel power+maximum pilot power available offset values-described scheduling obtains.
10. as the arbitrary described device of claim 6 to 9, it is characterized in that,
Described exterior ring power adjusting device also is used for using the CQI of user equipment to report to dispatch when channel quality is positioned at the indication of default mass range and outer shroud accumulative total and does not adjust CQI, obtains the HS-PDSCH transmitted power.
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| CN2010102341784A CN101888691A (en) | 2010-07-20 | 2010-07-20 | Outer loop power adjusting method and device |
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| CN2010102341784A CN101888691A (en) | 2010-07-20 | 2010-07-20 | Outer loop power adjusting method and device |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101594668A (en) * | 2009-06-30 | 2009-12-02 | 中兴通讯股份有限公司 | HS-SCCH Poewr control method and device |
| CN101626614A (en) * | 2009-06-22 | 2010-01-13 | 中兴通讯股份有限公司南京分公司 | Method and device for controlling outer ring power of high-speed physical downlink shared channel |
| WO2010025270A1 (en) * | 2008-08-27 | 2010-03-04 | Qualcomm Incorporated | Power control in a wireless communication system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010025270A1 (en) * | 2008-08-27 | 2010-03-04 | Qualcomm Incorporated | Power control in a wireless communication system |
| CN101626614A (en) * | 2009-06-22 | 2010-01-13 | 中兴通讯股份有限公司南京分公司 | Method and device for controlling outer ring power of high-speed physical downlink shared channel |
| CN101594668A (en) * | 2009-06-30 | 2009-12-02 | 中兴通讯股份有限公司 | HS-SCCH Poewr control method and device |
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Application publication date: 20101117 |