CN101232312A - Method and apparatus for controlling forward power in radio communication system - Google Patents
Method and apparatus for controlling forward power in radio communication system Download PDFInfo
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- CN101232312A CN101232312A CNA2007100730502A CN200710073050A CN101232312A CN 101232312 A CN101232312 A CN 101232312A CN A2007100730502 A CNA2007100730502 A CN A2007100730502A CN 200710073050 A CN200710073050 A CN 200710073050A CN 101232312 A CN101232312 A CN 101232312A
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Abstract
The invention relates to a wireless communication technology field and discloses a forward power control method and a device of a wireless communication system. The invention aims at providing the forward power control method and the device which can save more channel resources compared with the prior art. The method comprises: setting a forward signal-to-noise ratio set point; obtaining a corresponding signal-to-noise ratio value according to a CQI value; obtaining the next forward transmitting power according to the obtained relevant data; and adjusting the forward transmit power according to the obtained next forward transmit power. The device includes: an outer loop power control module and an inner loop power control module, the inner loop power control module includes a query module, a forward transmit power obtaining module and a forward transmit power adjusting module. The method and the device of the invention obtain the signal-to-noise ratio of the channel by utilizing the channel quality information which is reflected by the CQI value; thus carrying out the forward transmit control and providing a novel forward power control path for the wireless communication system which adopts the CQI value.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of method and apparatus of wireless communication system forward power control.
Background technology
Be the trend of speech business development from the circuit switching to the packet switching, realize that in mobile communication voip technology is the direction of next-generation mobile communications development.At AIE (Air InterfaceEvolution, AIE) and LTE (Long-term Evolution, Long Term Evolution) in, for voice service accomplishing, the implementation of VoIP is all proposed, because the contradiction between the unreliability of wireless channel and the real-time of speech business, realization VoIP service needed is carried out special processing in eating dishes without rice or wine.
In AIE second stage framework, some mobile device manufacturers and operation commercial city propose OFDM (hereinafter referred is OFDM) technology as a kind of physical-layer techniques that adopts in the next generation mobile communication system.The OFDM technology is divided into the narrow-band sub-carriers of some quadratures with the physical layer resources in the wireless communication system in frequency domain, high-speed data-flow is parallel transmission on each subcarrier by string and conversion.Because the narrow-band characteristic of subcarrier can overcome multi-path influence, has eliminated intersymbol interference greatly; Because the orthogonal property of subcarrier, promptly the frequency spectrum between subcarrier is overlapped, thereby has improved the utilance of frequency spectrum.
Physical layer resources in the ofdm system can be regarded the two dimensional surface that is formed by " time domain " and " frequency domain " as, can regard " time domain " as to the user, the three dimensions resource that " frequency domain " and " power " forms, service quality (hereinafter referred QoS) for the voip user, can pass through " time domain ", " frequency domain ", any one guarantees in " power ", under the situation that transmitting power and the frequency resource that takies remain unchanged, by taking more transmitting time, also promptly increase the number of times that mixes automatic request retransmission (hereinafter referred is HARQ), can guarantee user's QoS, yet agreement has been stipulated the maximum times of HARQ, guarantees that by time domain user's QoS is infeasible.Because the unpredictability of the position of portable terminal, if when speech business begins to insert, because it is nearer apart from the base station, channel condition is better, and the resource that needs is less relatively, along with the motion of portable terminal, distance from the base station is more and more far away, therefore channel condition also just becomes worse and worse, if use the resource size of distributing when inserting to send speech business again, will be difficult to the QoS of assurance speech business.In order to guarantee the QoS of speech business, in the VoIP business, need to introduce power control, just guaranteeing under the situation that time domain and frequency domain remain unchanged, be a kind of effective technical means by the QoS that adjusts forward emitting power assurance user VoIP.
In common wireless communication system, power control is divided into open Loop Power control and closed power control, closed power control is divided into exterior ring power control and inner loop power control according to the difference of controlling unit, then is divided into forward power according to the difference of controlling object and controls and reverse power control.Control for forward power, normally be controlled to be terminal forward direction signal to noise ratio set-point is set by exterior ring power, after receiving the signal of sending the base station when terminal, can measure the signal to noise ratio of this signal, by this signal to noise ratio and forward direction signal to noise ratio set-point are compared, terminal can be sent the forward emitting power control signal to the base station, and forward emitting power is adjusted according to this control signal in the base station.
This shows, in AIE second stage framework, wireless communication system is carried out forward power control be necessary.But, do not specifically describe how to carry out forward power control in this framework, obviously, adopting common forward power control method is a kind of possibility.
Summary of the invention
In AIE second stage framework, a kind of wireless communication system of the CQI of comprising value has been proposed, this CQI value is used for representing channel quality information.When terminal receives the signal that send the base station, just can obtain corresponding C QI value according to quality of channel, and this quantized value is fed back to the base station, with the channel quality of informing base station respective channel.
Because the CQI value is the reflection channel quality, different CQI values have been represented different channel qualities, and different channel qualities can be corresponding to different signal to noise ratios, so we can obtain corresponding signal to noise ratio by the CQI value of terminal to report, and utilize this noise recently to carry out forward power control.
This just provides a kind of thinking for us, that is: can be by utilizing the feedback information of CQI value as forward power control, and do not need to send specially the forward power feedback signal, thus save channel resource.At wireless communication field, saving radio channel resource as much as possible is one of target of constantly pursuing.If a kind of forward power control technology can be saved channel resource compared to prior art, this technology is exactly valuable so.Therefore, the invention reside in the forward power control method and the device that provide based on the CQI value,, save channel resource more with when carrying out forward power control.
Embodiments of the present invention provide a kind of method of wireless communication system forward power control, and this method comprises exterior ring power control and inner loop power control, wherein,
Described exterior ring power is controlled to be the base station forward direction signal to noise ratio set-point (SNRsetpt) is set;
The base station obtains corresponding snr value (SNRCQI) according to the CQI value;
The base station is according to the pairing snr value of CQI quantized value (SNRCQI), and in conjunction with forward direction signal to noise ratio set-point (SNRsetpt), the forward emitting power fiducial value obtains forward emitting power (NewTxPwr) next time;
The base station is adjusted forward emitting power according to the forward emitting power next time (NewTxPwr) that is obtained.
Embodiments of the present invention also provide a kind of device of wireless communication system forward power control, and this device comprises exterior ring power control module and inner loop power control module, wherein,
Described exterior ring power control module is used to the base station that forward direction signal to noise ratio set-point (SNRsetpt) is set;
Described inner loop power control module comprises:
Enquiry module is used for obtaining corresponding snr value (SNRCQI) according to the CQI value, and this snr value is offered forward emitting power acquisition module;
Forward emitting power obtains module, be used for determining forward emitting power (NewTxPwr) next time according to the data that obtain, and with this next time forward emitting power offer the forward emitting power adjusting module;
The forward emitting power adjusting module is used for obtaining the forward emitting power next time (NewTxPwr) that module obtained according to forward emitting power, and forward emitting power is adjusted.
By the method and apparatus that embodiment of the present invention provided, for the control of the forward power under the AIE second stage framework provides a kind of new approach.This method and apparatus has utilized the signal to noise ratio of existing CQI value and reflection thereof, calculates forward emitting power next time at inside of base station, makes that terminal does not need to have saved channel resource in addition to the control information of base station feedback forward power again.In fact, the method and apparatus that embodiment of the present invention provided is not limited to adopt under AIE second stage framework, as long as a kind of wireless communication system has adopted the physical quantity of CQI value or performance similar effect to represent channel quality, just can be by the method and apparatus that embodiment of the present invention provided, or carry out forward power control by the method and apparatus that is equal to.
Description of drawings
Fig. 1 is the flow chart of the execution mode of the inventive method;
Fig. 2 is the structural representation of the execution mode of apparatus of the present invention.
Embodiment
Below introduce a kind of execution mode of the inventive method, and 1 describe in conjunction with the accompanying drawings.
In a kind of wireless communication system, to adopt the CQI value to reflect channel quality, and adopted the forward power control strategy, this forward power control comprises exterior ring power control and inner loop power control, specifically may further comprise the steps:
S01: described exterior ring power is controlled to be the base station forward direction signal to noise ratio set-point (SNRsetpt) is set;
Its inner loop power control comprises:
The base station is adjusted forward emitting power according to the forward emitting power next time that is obtained.
S02: the base station obtains corresponding snr value (SNRCQI) according to the CQI value;
S03: the base station is according to the pairing snr value of CQI quantized value (SNRCQI), and in conjunction with forward direction signal to noise ratio set-point (SNRsetpt), the forward emitting power fiducial value obtains forward emitting power (NewTxPwr) next time, specifically, comprising:
According to the difference (SNRdiff) that the pairing snr value of CQI value (SNRCQI) that obtains and forward direction signal to noise ratio set-point (SNRsetpt) obtain both, this step can be expressed as
SNRdiff＝SNRsetpt-SNRCQI
The transmitting power of sharing signaling channel with forward direction is a fiducial value, and the transmitting power (SSCHTxPower) according to SNRdiff value that obtains and the shared signaling channel of forward direction obtains forward emitting power (NewTxPwr) next time, and this step can be expressed as
NewTxPwr＝SNRdiff+SSCHTxPowe?r
When increasing a power control surplus (POWEROFFSET), the method for expressing of a last step should change to
NewTxPwr＝SNRdiff+SSCHTxPower+POWEROFFSET
Wherein, described power control surplus (POWEROFFSET) is selected different values for use according to different types of service;
S04:, forward emitting power is adjusted according to the forward emitting power next time (NewTxPwr) that is obtained.
Another kind of execution mode below in conjunction with accompanying drawing 1 explanation the inventive method.
The difference of following execution mode and preceding a kind of execution mode is that preceding a kind of execution mode selects for use the transmitting power of the shared signaling channel of forward direction as fiducial value, and will adopt last forward emitting power as fiducial value in the present embodiment.Accordingly, the step of forward emitting power is also different next time for subsequent calculations.
In a kind of wireless communication system, to adopt the CQI value to reflect channel quality, and adopted the forward power control strategy, this forward power control comprises exterior ring power control and inner loop power control, specifically may further comprise the steps:
S01: described exterior ring power is controlled to be the base station forward direction signal to noise ratio set-point (SNRsetpt) is set;
S02: the base station obtains corresponding snr value (SNRCQI) according to the CQI value;
S03: the base station is according to the pairing snr value of CQI quantized value (SNRCQI), and in conjunction with forward direction signal to noise ratio set-point (SNRsetpt), the forward emitting power fiducial value obtains forward emitting power (NewTxPwr) next time, specifically, comprising:
With last forward emitting power is fiducial value, obtains forward direction and shares the transmitting power (SSCHTxPower) of signaling channel and the difference (POWdiff) between the last forward emitting power (OldTxPwr), and this step can be expressed as
POWdiff＝SSCHTxPower-OldTxPwr
According to POWdiff value that is obtained and the pairing snr value of CQI value (SNRCQI), obtaining to access terminal receives the signal to noise ratio (TrafficSNR) of Traffic Channel, and this step can be expressed as
TrafficSNR＝SNRCQI-POWdiff
Receive signal to noise ratio (TrafficSNR), last forward emitting power (OldTxPwr) and the forward direction signal to noise ratio set-point (SNRsetpt) of Traffic Channel according to access terminal (AT), obtain forward emitting power (NewTxPwr) next time, this step can be expressed as
NewTxPwr＝SNRsetpt+(OldTxPwr-TrafficSNR)
When increasing a power control surplus (POWEROFFSET), the method for expressing of a last step should change to
NewTxPwr＝SNRsetpt+(OldTxPwr-TrafficSNR)+POWEROFFSET
Wherein, described power control surplus (POWEROFFSET) is selected different values for use according to different types of service;
S04:, forward emitting power is adjusted according to the new forward emitting power (NewTxPwr) that is obtained.
Below introduce a kind of execution mode of apparatus of the present invention, and 2 describe in conjunction with the accompanying drawings.
In a kind of device 101 of wireless communication system forward power control, comprise exterior ring power control module 201 and inner loop power control module 202, wherein,
Exterior ring power control module 201 is used to the base station that forward direction signal to noise ratio set-point is set;
202 of inner loop power control modules comprise:
Forward emitting power obtains module 302, is used for determining forward emitting power (NewTxPwr) next time, and offering forward emitting power adjusting module 303 according to the data that obtain;
Forward emitting power adjusting module 303 is used for obtaining the new forward emitting power (NewTxPwr) that module 302 is obtained according to forward emitting power, and forward emitting power is adjusted.
In the present embodiment, described inner loop power control module can also comprise that a power control surplus obtains module 304, is used to obtain power control surplus (POWEROFFSET), and offers forward emitting power acquisition module 302.This power control surplus obtains module can select different power control surpluses (POWEROFFSET) for use according to different types of service.
Corresponding with the structure of installing described in the present embodiment, the data that described forward emitting power obtains module 302 acquisitions comprise: according to the transmitting power (SSCHTxPower) of the pairing snr value of CQI value (SNRCQI), forward direction signal to noise ratio set-point (SNRsetpt), the shared signaling channel of forward direction, and power control surplus (POWEROFFSET).
Wherein, the data of described forward emitting power acquisition module 302 acquisitions can further include: last forward emitting power (OldTxPwr).
For method and apparatus of the present invention, within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. the method for a wireless communication system forward power control comprises exterior ring power control and inner loop power control, it is characterized in that, described forward power control comprises:
The base station obtains to be in the described exterior ring power control procedure forward direction signal to noise ratio set-point of its setting;
The base station obtains corresponding snr value according to the CQI value;
The base station is according to the pairing snr value of CQI value, and in conjunction with forward direction signal to noise ratio set-point, the forward emitting power fiducial value obtains forward emitting power next time;
The base station is adjusted forward emitting power according to the forward emitting power next time that is obtained.
2. method according to claim 1 is characterized in that, described forward emitting power fiducial value is meant that forward direction shares the transmitting power of signaling channel.
3. method according to claim 2 is characterized in that, described transmitting power with the shared signaling channel of forward direction is a fiducial value, and obtaining next time, forward emitting power may further comprise the steps:
The difference that obtains both according to the pairing snr value of CQI value that obtains and forward direction signal to noise ratio set-point;
Transmitting power according to difference that obtains and the shared signaling channel of forward direction obtains forward emitting power next time.
4. method according to claim 1 is characterized in that, described forward emitting power fiducial value is meant last forward emitting power.
5. method according to claim 4 is characterized in that, described is benchmark with last forward emitting power, and obtaining next time, forward emitting power may further comprise the steps:
Obtain forward direction and share the transmitting power of signaling channel and the difference between the last forward emitting power;
According to difference that is obtained and the pairing snr value of CQI value, acquisition accesses terminal and receives the signal to noise ratio of Traffic Channel;
Receive signal to noise ratio, last forward emitting power and the forward direction signal to noise ratio set-point of Traffic Channel according to accessing terminal, obtain forward emitting power next time.
6. according to any one described method in the claim 1～5, it is characterized in that, described according to the pairing snr value of CQI value, in conjunction with forward direction signal to noise ratio set-point, when obtaining next time forward emitting power, increase a power control surplus.
7. the described method of claim 6 is characterized in that, described power control surplus is selected different values for use according to different types of service.
8. the device of wireless communication system forward power control, this device comprises exterior ring power control module and inner loop power control module, it is characterized in that,
Described exterior ring power control module is used to the base station that forward direction signal to noise ratio set-point is set;
Described inner loop power control module comprises:
Enquiry module is used for obtaining corresponding snr value according to the CQI value, and this snr value is offered forward emitting power acquisition module;
Forward emitting power obtains module, be used for determining forward emitting power next time according to the data that obtain, and with this next time forward emitting power offer the forward emitting power adjusting module;
The forward emitting power adjusting module is used for obtaining the forward emitting power next time that module obtained according to forward emitting power, and forward emitting power is adjusted.
9. device according to claim 8 is characterized in that, described inner loop power control module comprises that also a power control surplus obtains module, is used to obtain power control surplus, and this power control surplus is offered forward emitting power acquisition module.
10. device according to claim 9 is characterized in that, when described power control surplus obtains module acquisition power control surplus, selects different power control margin value for use according to different types of service.
11. device according to claim 8 is characterized in that, the data that described forward emitting power control module obtains comprise: the transmitting power of sharing signaling channel according to the pairing snr value of CQI value, forward direction signal to noise ratio set-point, forward direction.
12. device according to claim 11 is characterized in that, the data that described forward emitting power control module obtains also comprise: last forward emitting power.
13. according to Claim 8, any one described device in 11 or 12, it is characterized in that the data that described forward emitting power control module obtains also comprise: power control surplus.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007100730502A CN101232312A (en) | 2007-01-25 | 2007-01-25 | Method and apparatus for controlling forward power in radio communication system |
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| CNA2007100730502A CN101232312A (en) | 2007-01-25 | 2007-01-25 | Method and apparatus for controlling forward power in radio communication system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101594668B (en) * | 2009-06-30 | 2011-11-23 | 中兴通讯股份有限公司 | Method and device for controlling HS-SCCH power |
| CN102281571A (en) * | 2010-06-11 | 2011-12-14 | 电信科学技术研究院 | Power control method and equipment |
| CN103166746A (en) * | 2013-03-25 | 2013-06-19 | 东南大学 | High-energy-efficiency link adaptive method for long term evolution downlink |
| CN107071885A (en) * | 2017-05-10 | 2017-08-18 | 深圳市朗信浩通科技有限公司 | Adjust the method and device of transmission power |
-
2007
- 2007-01-25 CN CNA2007100730502A patent/CN101232312A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101594668B (en) * | 2009-06-30 | 2011-11-23 | 中兴通讯股份有限公司 | Method and device for controlling HS-SCCH power |
| CN102281571A (en) * | 2010-06-11 | 2011-12-14 | 电信科学技术研究院 | Power control method and equipment |
| CN103166746A (en) * | 2013-03-25 | 2013-06-19 | 东南大学 | High-energy-efficiency link adaptive method for long term evolution downlink |
| CN103166746B (en) * | 2013-03-25 | 2016-09-21 | 东南大学 | A kind of high energy efficiency chain circuit self-adaptive method for long term evolution downlink |
| CN107071885A (en) * | 2017-05-10 | 2017-08-18 | 深圳市朗信浩通科技有限公司 | Adjust the method and device of transmission power |
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Open date: 20080730 |