CN102883421A - Uplink transmission open loop power control method and device - Google Patents

Uplink transmission open loop power control method and device Download PDF

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Publication number
CN102883421A
CN102883421A CN2012101296969A CN201210129696A CN102883421A CN 102883421 A CN102883421 A CN 102883421A CN 2012101296969 A CN2012101296969 A CN 2012101296969A CN 201210129696 A CN201210129696 A CN 201210129696A CN 102883421 A CN102883421 A CN 102883421A
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sta
cap
uplink
power
transmission
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Inventor
潘立军
姚惠娟
周玉宝
于晓燕
雷俊
王竞
刘慎发
闫志刚
鲍东山
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Beijing Nufront Mobile Multimedia Technology Co Ltd
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Beijing Nufront Wireless Technology Co Ltd
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Priority to CN2012101296969A priority Critical patent/CN102883421A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/10—Open loop power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses an uplink transmission open loop power control method which comprises the following steps: calculating the target value of the transmission power a STA (station), and adjusting the transmission power of the STA according to the target vale. The target value of the transmission power of the STA is calculated according to the maximum transmission power of the STA, the uplink transmission path loss, the parameter of the relation between the transmission bandwidth and the basic effective bandwidth deictic, which is allocated to the uplink transmission by a deictic CAP (center access point), the deviation of adjustment of the STA, and the lowest receiving power relative to the noise and interference of the receiving end, which corresponds to the modulating and coding mode. The invention further discloses an uplink transmission open loop power control device.

Description

Uplink open-loop power control method and device
It is on May 19th, 2011 that the application requires the applying date, and application number is 201110130194.3, and denomination of invention is the priority in first to file of " a kind of communication system ", should all embody in this application at the full content of first to file.
It is on February 7th, 2012 that the application requires the applying date, and application number is 201210026860.3, and denomination of invention is the priority in first to file of " method of up access open Loop Power control and device ", should all embody in this application at the full content of first to file.
Technical field
The invention belongs to wireless communication field, relate in particular to uplink open-loop power control method and device.
Background technology
In recent years, wireless communication system develops rapidly, such as based on the wireless local area network technology WiFi of 802.11 standards, based on 802.15 bluetooth (Bluetooth) system and by mobile communication system derivative and come towards Femto technology of indoor application etc., all be widely used.
WiFi technology based on 802.11 is the current the widest a kind of wireless network transmission technology of using.Because the WiFi system has adopted carrier sense/conflict to avoid (CSMA/CA, Carrier Sense Multiple Access with Collision Avoidance) mechanism, system effectiveness is lower, and is larger to waste of radio resources.The basic reason that causes this problem is that CSMA/CA mechanism is a kind of random division multiple accessing access mechanism based on competition, access point (AP, Access Point) and website (STA, Station) between, perhaps between the different STA, can by the right to use of CSMA/CA mechanism competition Radio Resource, compete simultaneously wireless channel, just bump this moment, causes the waste of Radio Resource.For fear of collision, CSMA/CA mechanism requires AP or STA to need random back when the competition wireless channel, when all AP and STA keep out of the way, though wireless channel is available free, is not used, and this also is the significant wastage to wireless channel.For above-mentioned reasons, 802.11 system effectivenesies are lower.For example: 802.11g system physical layer peak rate can reach 54Mbps, but TCP layer achievable rate under large packet downloading service is not higher than 30Mbps.Although there is above-mentioned shortcoming, 802.11 systems are flexible, do not rely on centralized control mechanism, therefore also can realize lower equipment cost.
Femto technology based on the 3GPP standard is from mobile communication system evolution and the new technology that covers in a kind of faced chamber that comes.Based on the data statistics to the 3G system, about 70% data service all occurs in indoor, so indoor high-speed rate data access scheme is just particularly important.The Femto base station is called femto base station, and volume is small and exquisite, disposes flexibly.Owing to coming from mobile communication system evolution, all characteristics of mobile communication system have almost been inherited in the Femto base station.Femto equipment is just in conjunction with its limited coverage, and the less application scenarios features such as access user reduce the device processes ability, and then reduces equipment cost.Consider from duplex mode, identical with mobile communication system, the Femto base station can be divided into Frequency Division Duplexing (FDD) (FDD, Frequency Division Duplexing) and time division duplex (TDD, Time Division Duplexing) two classes duplex mechanism.FDD up-downgoing carrier resource is symmetrical, and the asymmetrical service feature of data service up-downgoing data traffic is so that there is certain wasting of resources during in the face of data service in the FDD system.TDD system uplink downlink is operated on the same carrier wave, is that uplink downlink distributes different Radio Resources by the time division resource, therefore can the asymmetrical data service of better adaptive up-downgoing business demand than FDD.Yet, the TDD duplex mode of mobile communication system (comprising the Femto system), up-downgoing resource static allocation, in the face of the different Various types of data business of demand, for example: browsing page, mobile video, moving games etc. are difficult to realize the dynamic adaptation of business demand and resource division.Compare with Wi-Fi, because Femto has adopted the centralized control mechanism based on scheduling, do not have the waste of radio resources that causes owing to competing conflict and random back between base station or CAP and terminal or the terminal, so link efficiency is higher.
For the wireless communication system of TDD, for the consideration that overcomes the factors such as path loss, there is the demand of carrying out the uplink open Loop Power control.
Summary of the invention
In view of this, an object of the present invention is to provide two kinds of uplink open-loop power control methods.
Another object of the present invention provides two kinds of uplink open-looped power control devices.
For there is a basic understanding some aspects to the embodiment that discloses, the below has provided simple summary.This summary part is not to comment general, neither determine the key/critical component or describe the protection range of these embodiment.Its sole purpose is to present some concepts with simple form, with this preamble as following detailed description.
Technical solution of the present invention is achieved in that
A kind of uplink open-loop power control method, the method comprises:
Calculate the desired value of site STA transmitting power;
Adjust the transmitting power of described STA according to described desired value;
Wherein, described calculating is carried out based on following formula:
P STA=min{P STA_MAX, PL OL+ C/N+10log 10(BW)+offset CAP+ offset STA; P wherein STA_MAXBe the maximum transmission power of described STA, PL OLBe the uplink transmission path loss, C/N be modulation coding mode corresponding, with respect to the minimum received power of receiving terminal Noise and Interference, BW is that Deictic Center access point CAP is the transmission bandwidth of uplink distribution and the parameter of the relation between the basic effective bandwidth, offset CAPBe the deviation adjusting of described CAP, offset STADeviation adjusting for described STA.
As optional execution mode, by resolving the message of described CAP broadcasting, obtain the deviation adjusting of described CAP.
As optional execution mode, when described STA does not receive the correct feedback that receives of described CAP after a uplink, increase the value of the deviation adjusting of STA, be used for calculating the desired value of described STA transmitting power next time; When described STA receives the correct feedback that receives of described CAP after setting time uplink continuously, reduce the value of the deviation adjusting of STA, be used for calculating the desired value of described STA transmitting power next time.
A kind of uplink open-loop power control method, the method comprises:
Calculate the desired value of site STA transmitting power;
Adjust the transmitting power of described STA according to described desired value;
Wherein, described calculating is carried out based on following formula:
P STA=min{P STA_MAX, PL OL+ C/N+10log 10(BW) }; P wherein STA_MAXBe the maximum transmission power of described STA, PL OLBe the uplink transmission path loss, C/N be modulation coding mode corresponding, with respect to the minimum received power of receiving terminal Noise and Interference, BW is the transmission bandwidth that distributes of uplink and the basic parameter of the relation between the effective bandwidth for indication CAP.
In above-mentioned two kinds of methods, as optional execution mode, estimate described uplink transmission path loss according to the transmitting power of described STA received signal power and described CAP.
Optionally, by resolving the message of described CAP broadcasting, obtain the transmitting power of described CAP.
In above-mentioned two kinds of methods, as optional execution mode, by resolving the control channel CCH of the physical frame that described CAP sends, obtaining described CAP is the transmission bandwidth that uplink distributes, then calculating described CAP and be the multiple that transmission bandwidth that uplink distributes is compared with basic effective bandwidth, is the transmission bandwidth that distributes of uplink and the basic parameter of the relation between the effective bandwidth as described indication CAP.
In above-mentioned two kinds of methods, as optional execution mode, by resolving the CCH of the physical frame that described CAP sends, obtaining described CAP and be the multiple that transmission bandwidth that uplink distributes is compared with basic effective bandwidth, is the transmission bandwidth that distributes of uplink and the basic parameter of the relation between the effective bandwidth as described indication CAP.
In above-mentioned two kinds of methods, as optional execution mode, by resolving the CCH of the physical frame that described CAP sends, determine modulation coding mode, then by searching default modulation coding mode and the mapping table of minimum received power, determine the minimum received power that current modulation coding mode is corresponding.
A kind of uplink open-looped power control device, this device comprises:
First module is for the desired value of calculating the site STA transmitting power;
Second unit is for the transmitting power of adjusting described STA according to described desired value;
Wherein, the calculating of described first module is carried out based on following formula:
P STA=min{P STA_MAX, PL OL+ C/N+10log 10(BW)+offset CAP+ offset STA; P wherein STA_MAXBe the maximum transmission power of described STA, PL OLBe the uplink transmission path loss, C/N be modulation coding mode corresponding, with respect to the minimum received power of receiving terminal Noise and Interference, BW is the transmission bandwidth that distributes of uplink and the basic parameter of the relation between the effective bandwidth for indication CAP, offset CAPBe the deviation adjusting of described CAP, offset STADeviation adjusting for described STA.
As optional execution mode, this device also comprises: Unit the 3rd is used for obtaining the deviation adjusting of described CAP by resolving the message of described CAP broadcasting.
As optional execution mode, this device also comprises: Unit the 4th, be used for when described STA does not receive the correct feedback that receives of described CAP after a uplink, increasing the value of the deviation adjusting of STA, be used for calculating the desired value of described STA transmitting power next time; When described STA receives the correct feedback that receives of described CAP after setting time uplink continuously, reduce the value of the deviation adjusting of STA, be used for calculating the desired value of described STA transmitting power next time.
A kind of uplink open-looped power control device, this device comprises:
First module is for the desired value of calculating the site STA transmitting power;
Second unit is for the transmitting power of adjusting described STA according to described desired value;
Wherein, the calculating of described first module is carried out based on following formula:
P STA=min{P STA_MAX, PL OL+ C/N+10log 10(BW) }; P wherein STA_MAXBe the maximum transmission power of described STA, PL OLBe the uplink transmission path loss, C/N be modulation coding mode corresponding, with respect to the minimum received power of receiving terminal Noise and Interference, BW is the transmission bandwidth that distributes of uplink and the basic parameter of the relation between the effective bandwidth for indication CAP.
In above-mentioned two kinds of devices, as optional execution mode, this device also comprises: computing unit is used for the transmitting power estimation uplink transmission path loss according to described STA received signal power and described CAP.
Optionally, described computing unit parses the transmitting power of described CAP from the message of CAP broadcasting.
In above-mentioned two kinds of devices, as optional execution mode, this device also comprises: the first determining unit, be used for the CCH by the physical frame of resolving described CAP transmission, determine that described CAP is the transmission bandwidth that uplink distributes, calculating described CAP and be the multiple that transmission bandwidth that uplink distributes is compared with basic effective bandwidth, is the transmission bandwidth that distributes of uplink and the basic parameter of the relation between the effective bandwidth as described indication CAP.
In above-mentioned two kinds of devices, as optional execution mode, this device also comprises: the first determining unit, be used for the CCH by the physical frame of resolving described CAP transmission, obtaining described CAP and be the multiple that transmission bandwidth that uplink distributes is compared with basic effective bandwidth, is the transmission bandwidth that distributes of uplink and the basic parameter of the relation between the effective bandwidth as described indication CAP.
In above-mentioned two kinds of devices, as optional execution mode, this device also comprises: the second determining unit, be used for the CCH by the physical frame of resolving described CAP transmission, determine modulation coding mode, by searching default modulation coding mode and the mapping table of minimum received power, determine the minimum received power that modulation coding mode is corresponding.
For above-mentioned and relevant purpose, one or more embodiment comprise the feature that the back will describe in detail and particularly point out in the claims.Below explanation and accompanying drawing describe some illustrative aspects in detail, and its indication only is some modes in the utilizable variety of way of principle of each embodiment.Other benefit and novel features will consider by reference to the accompanying drawings and become obviously along with following detailed description, and the disclosed embodiments are to comprise being equal to of all these aspects and they.
Figure of description
Fig. 1 is the first uplink open-loop power control method flow chart in the embodiment of the invention;
Fig. 2 is the reference model of EUHT system;
Fig. 3 is that the connecting system of EUHT system forms;
Fig. 4 is the process schematic diagram of the sending and receiving of protocol data between STA and the CAP;
Fig. 5 is the structural representation of the first uplink open-looped power control device in the embodiment of the invention;
Fig. 6 is the structural representation of the first uplink open-looped power control device in the optional execution mode of the embodiment of the invention;
Fig. 7 is the structural representation of the second uplink open-looped power control device in the optional execution mode of the embodiment of the invention.
Embodiment
The following description and drawings are expressed specific embodiments of the present invention fully, to enable those skilled in the art to realize them.Other embodiments can comprise structure, logic, electric, process and other change.Embodiment only represents possible variation.Unless explicitly call for, otherwise independent assembly and function are optional, and the order of operation can change.The part of some embodiments and feature can be included in or replace part and the feature of other embodiments.The scope of embodiment of the present invention comprises the gamut of claims, and all obtainable equivalents of claims.In this article, these embodiments of the present invention can be represented with term " invention " individually or always, this only is for convenient, and if in fact disclose and surpass one invention, not that the scope that will automatically limit this application is any single invention or inventive concept.
Fig. 1 is the first uplink open-loop power control method flow chart in the embodiment of the invention, and this flow process comprises:
Step 11: the desired value of calculating the STA transmitting power.
Step 12: the transmitting power of adjusting described STA according to described desired value.
Wherein, the calculating in the step 11 is carried out based on following formula:
P STA=min{P STA_MAX, PL OL+ C/N+10log 10(BW)+offset CAP+ offset STA; P wherein STA_MAXBe the maximum transmission power of described STA, PL OLBe the uplink transmission path loss, C/N be modulation coding mode corresponding, with respect to the minimum received power of receiving terminal Noise and Interference, BW is that Deictic Center access point CAP is the transmission bandwidth of uplink distribution and the parameter of the relation between the basic effective bandwidth, offset CAPBe the deviation adjusting of described CAP, offset STADeviation adjusting for described STA.
The second uplink open-loop power control method in the embodiment of the invention, step 11～step 12 is similar to shown in Figure 1 for its flow process, just uses following formula to calculate the desired value of adjusting the STA transmitting power in step 11:
P STA=min{P STA_MAX, PL OL+ C/N+10log 10(BW) }; P wherein STA_MAXBe the maximum transmission power of described STA, PL OLBe the uplink transmission path loss, C/N be modulation coding mode corresponding, with respect to the minimum received power of receiving terminal Noise and Interference, BW is the transmission bandwidth of uplink distribution and the parameter of the relation between the basic effective bandwidth for indication CAP, and min refers to get the maximum transmission power of STA and the minimum value of second portion addition result.The unit of this formula is dBm.
The below provides the optional execution mode of the embodiment of the invention, and these execution modes are all take enhancement mode ultrahigh speed WLAN (wireless local area network) (EUHT) system of new definition as application scenarios, but this application scenarios only be concrete for example.
Fig. 2 is the reference model of EUHT system, mainly refers to the air interface reference model, comprising: media access control (MAC) layer and physics (PHY) layer, and the major function of each layer is summarized as follows:
1. the MAC layer comprises adaptive sublayer and media access control sublayer.
Adaptive sublayer: mapping between external network data and the MAC layer service agreement unit (MSDU) and the function of conversion mainly are provided.MSDU refers to the information of paying as the unit between the MAC service access point (SAP).
Media access control sublayer: except taking on the media access control function, also comprise to the management of system and control and to the support of the specific function of PHY layer.
2. PHY layer: mainly provide the PHY transmission mechanism that mac-layer protocol data cell (MPDU) is mapped to corresponding physical channel, for example OFDM (OFDM) and multiple-input, multiple-output (MIMO) technology.MPDU refers to the data cell of utilizing the service of PHY layer to exchange between two reciprocity MAC entities.
Fig. 3 is that the connecting system of EUHT system forms, and comprises central access point (CAP) and website (STA), and wherein STA can be various data equipments, such as: PDA, notebook, camera, video camera, mobile phone, panel computer, pad etc.As shown in Figure 3, STA1 and STA2 access CAP by air interface protocol, and CAP sets up by wired or wireless and existing external network (such as IP backbone, Ethernet) and communicates by letter.Wherein the agreement of CAP forms and comprises MAC layer and PHY layer.The STA agreement forms and comprises application (Application) layer, transmission control (TCP) layer, network (IP) layer, MAC layer and PHY layer.
Form based on agreement shown in Figure 3, Fig. 4 has provided the process of the sending and receiving of protocol data between STA and the CAP, for example: STA wants to send data to CAP, STA at first processes application data (such as VoIP, video etc.) and packing through application layer, tcp/ip layer, form with the IP grouping sends to the adaptive sublayer of IP, by changing and shine upon in the adaptive sublayer of IP, send to media access control sublayer, media access control sublayer is through operations such as burst, encryption, framing, polymerizations, issue the PHY layer, finally be mapped to by PHY and carry out transfer of data on the wireless channel.
In the following execution mode of enumerating for the method for the embodiment of the invention, all the executive agent with open Loop Power control directly is written as STA, and in fact this executive agent also can be to be positioned at the independent community of homonymy with STA, or is integrated in the entity of STA inside.
Enumerate following optional execution mode for the second uplink transmit power control method in the embodiment of the invention.Below in the optional execution mode, STA is when having the uplink demand, request CAP be this uplink allocation of transmission bandwidth, and to need in the formula of desired value of calculating transmitting power to determine other parameters of using, calculate again the desired value of transmitting power according to computing formula, then adjust transmitting power according to the desired value that calculates.
In some optional execution modes, transmitting power estimation uplink transmission path loss according to STA received signal power and CAP, for example, in the situation that uplink downlink symmetry, can be by measuring the received power of current leading or data division, and with reference to the loss of CAP transmitting power estimation downlink transmission path, then according to the reciprocity of uplink downlink, obtain the uplink transmission path loss.
The transmitting power of the CAP that STA will use in the time of can obtaining estimating the uplink transmission path loss by the message of CAP broadcasting.In the EUHT system, broadcast message frame (BCF) is a kind of frame of CAP broadcasting, and CAP is with periodic broadcast BCF, and STA whenever detects BCF one time, just can obtain the transmitting power of CAP.The CAP transmitting power field that can have 8 bits in the frame of BCF, the current transmit power of indication CAP, the signed decimal number of this Related fields is n, n=-128～127 (the negative part represents take complement form): the CAP transmitting power is ndBm.Can find out, carry the CAP transmitting power among the BCF, STA can therefrom obtain the CAP transmitting power after receiving BCF.
In some optional execution modes, STA can determine that indication CAP is the transmission bandwidth of uplink distribution and the parameter of the relation between the basic effective bandwidth by dual mode.
Mode one, STA resolves first the control channel (CCH) of the physical frame of CAP transmission, to obtain the resource indication for current uplink, determine that CAP is the transmission bandwidth that uplink distributes, then to calculate CAP be the multiple that transmission bandwidth that uplink distributes is compared with basic effective bandwidth to STA, obtains described parameter.As seen, in mode one, STA needs by calculating described parameter after obtaining the transmission bandwidth that CAP is the uplink distribution.
Mode two, STA is by the CCH of the physical frame of resolving CAP and sending, and obtains CAP and be the multiple that transmission bandwidth that uplink distributes is compared with basic effective bandwidth, obtains described parameter.As seen, in mode two, STA directly obtains described parameter.
In aforesaid way one and mode two, based on the difference of the predetermined effective primary bandwidth of system, described multiple may be integral multiple, also may be minute several times.
In some optional execution modes, STA obtains the modulation coding mode indication by the CCH of the physical frame that parsing CAP sends, to determine modulation coding mode, then according to the mapping table that sets in advance modulation coding mode and minimum received power, determine the minimum received power that current modulation coding mode is corresponding by the mode of tabling look-up.
In some optional execution modes, if STA side and CAP side have the droop adjusted value of regulation separately, then STA is when calculating the desired value of adjusting transmitting power, can consider the droop adjusted value of STA side and CAP side is added in the computing formula, be about to droop adjusted value and the PL of STA side and CAP side OL+ C/N+10log 10(BW) result of calculation addition.
For the first uplink transmit power control method in the embodiment of the invention, in optional execution mode, determine CAP transmitting power, estimation uplink transmission path loss, determine indication CAP be the transmission bandwidth that distributes of uplink with basic effective bandwidth between parameter, and the method for minimum received power corresponding to definite modulation coding mode of relation, identical with in the optional execution mode of aforementioned the second uplink transmit power control method.
Further, for the first uplink open-loop power control method in the embodiment of the invention, in optional execution mode, STA needs the message by CAP broadcasting, and aforementioned BCF frame is for example determined the deviation adjusting of CAP in the computing formula.
Further, for the first uplink open-loop power control method in the embodiment of the invention, in optional execution mode, STA need determine the deviation adjusting of STA in the computing formula, for example, when STA does not receive the correct feedback that receives of CAP after a uplink, then can increase the value of the deviation adjusting of STA, when calculating the desired value of STA transmitting power next time, when STA receives the correct feedback that receives of CAP after setting time uplink continuously, then can reduce the value of the deviation adjusting of STA, when calculating the desired value of STA transmitting power next time.Above-mentioned setting time is the integer more than or equal to 2.
Optionally, can initial value be set for the deviation adjusting of STA.When the value of the deviation adjusting that increases STA, increase the step value that arranges on the deviation adjusting basis of current STA, when the value of the deviation adjusting that reduces STA, the step value that reduces to arrange on the deviation adjusting basis of current STA.As a kind of optional execution mode, if STA has received the correct feedback that receives of CAP after setting time uplink continuously, but the deviation adjusting of current STA has been initial value, then no longer reduces the value of the deviation adjusting of STA.
Fig. 5 is the structural representation of the first uplink open-looped power control device in the embodiment of the invention, and this device comprises: first module 51 and second unit 52.
First module 51 is for the desired value of calculating the STA transmitting power.
Second unit 52 is for the transmitting power of adjusting described STA according to described desired value.
Wherein, the calculating of first module 51 execution is carried out based on following formula:
P STA=min{P STA_MAX, PL OL+ C/N+10log 10(BW)+offset CAP+ offset STA; P wherein STA_MAXBe the maximum transmission power of described STA, PL OLBe the uplink transmission path loss, C/N be modulation coding mode corresponding, with respect to the minimum received power of receiving terminal Noise and Interference, BW is the transmission bandwidth that distributes of uplink and the basic parameter of the relation between the effective bandwidth for indication CAP, offset CAPBe the deviation adjusting of described CAP, offset STADeviation adjusting for described STA.
The second uplink open-looped power control device in the embodiment of the invention, structure are with shown in Figure 5 identical, and just the first module 51 in this device is calculated the desired value of site STA transmitting power adjustment by following formula:
P STA=min{P STA_MAX, PL OL+ C/N+10log 10(BW) }; P wherein STA_MAXBe the maximum transmission power of affiliated STA, PL OLBe the uplink transmission path loss, C/N be modulation coding mode corresponding, with respect to the minimum received power of receiving terminal Noise and Interference, BW is the transmission bandwidth that distributes of uplink and the basic parameter of the relation between the effective bandwidth for indication CAP.
The below provides the optional execution mode of two kinds of uplink open-looped power control devices in the embodiment of the invention.
Fig. 6 is the structural representation of the first uplink open-looped power control device in the optional execution mode of the embodiment of the invention, and this device comprises: first module 61, second unit 62, computing unit 63, the first determining unit 64, the second determining unit 65, the 3rd unit 66 and the 4th unit 67.
First module 61 is for the desired value of calculating the STA transmitting power.The calculating that first module 61 is carried out is carried out based on following formula:
P STA=min{P STA_MAX, PL OL+ C/N+10log 10(BW)+offset CAP+ offset STA; P wherein STA_MAXBe the maximum transmission power of described STA, PL OLBe the uplink transmission path loss, C/N be modulation coding mode corresponding, with respect to the minimum received power of receiving terminal Noise and Interference, BW is the transmission bandwidth that distributes of uplink and the basic parameter of the relation between the effective bandwidth for indication CAP, ofset CAPBe the deviation adjusting of described CAP, offset STADeviation adjusting for described STA.
Second unit 62 for the desired value that draws according to first module 61, is adjusted the transmitting power of STA.
Computing unit 63 is used for parsing from the message of CAP broadcasting the transmitting power of described CAP, and estimates the estimated value of uplink transmission path loss according to the transmitting power of STA received signal power and described CAP.
The first determining unit 64 has two kinds of working methods.
Mode one, the first determining unit 64 is by the CCH of the physical frame of parsing CAP transmission, determine that CAP is the transmission bandwidth that uplink distributes, calculating CAP is the multiple that the transmission bandwidth of uplink distribution is compared with basic effective bandwidth, and obtaining indicating CAP is the transmission bandwidth of uplink distribution and the parameter of the relation between the basic effective bandwidth.
Mode two, the first determining unit 64 is by the CCH of the physical frame of parsing CAP transmission, obtain indication CAP and be the multiple that transmission bandwidth that uplink distributes is compared with basic effective bandwidth, to obtain indicating CAP be the transmission bandwidth that distributes of uplink and the basic parameter of the relation between the effective bandwidth.
In aforesaid way one and mode two, based on the difference of the predetermined effective primary bandwidth of system, described multiple may be integral multiple, also may be minute several times.
The second determining unit 65 is used for determining modulation coding mode by the CCH that resolves the physical frame that CAP sends, and by searching default modulation coding mode and the mapping table of minimum received power, determines the minimum received power that modulation coding mode is corresponding.
The 3rd unit 66 is used for obtaining the deviation adjusting of CAP by resolving the message of described CAP broadcasting.
The 4th unit 67, be used for when STA does not receive the correct feedback that receives of CAP after a uplink, increase the deviation adjusting of STA, be used for calculating the desired value of STA transmitting power next time, when STA receives the correct feedback that receives of CAP after setting time uplink continuously, reduce the value of the deviation adjusting of STA, be used for calculating the desired value of STA transmitting power next time.
Fig. 7 is the structural representation of the second uplink open-looped power control device in the optional execution mode of the embodiment of the invention, and this device comprises: first module 71, second unit 72, computing unit 73, the first determining unit 74 and the second determining unit 75.
Second unit 72, computing unit 73, the first determining unit 74, and the function of the second determining unit 75, respectively with second unit 62 shown in Figure 6, computing unit 63, the first determining unit 64, and the function of the second determining unit 65 identical, repeat no more here.
First module 71 is for the desired value of calculating the STA transmitting power.The calculating that first module 71 is carried out is carried out based on following formula:
P STA=min{P STA_MAX, PL OL+ C/N+10log 10(BW) }; P wherein STA_MAXBe the maximum transmission power of described STA, PL OLBe the uplink transmission path loss, C/N be modulation coding mode corresponding, with respect to the minimum received power of receiving terminal Noise and Interference, BW is the transmission bandwidth that distributes of uplink and the basic parameter of the relation between the effective bandwidth for indication CAP.
The uplink open-looped power control device that the embodiment of the invention provides can be arranged in STA, also can be the corpus separatum with the STA homonymy.
Should be understood that the particular order of the step in the disclosed process or the example that level is illustrative methods.Based on design preference, should be appreciated that, the particular order of the step in the process or level can be in the situation that do not break away from protection range of the present disclosure and rearranged.Appended claim to a method has provided the key element of various steps with exemplary order, and is not to be limited to described particular order or level.
In above-mentioned detailed description, various features are combined in the single embodiment together, to simplify the disclosure.This open method should be interpreted as reflecting such intention, that is, and the more feature of feature that the embodiment of theme required for protection need to clearly be stated in each claim.On the contrary, as appending claims reflected, the present invention was in the state that lacks than whole features of disclosed single embodiment.Therefore, appending claims clearly is merged in the detailed description hereby, and wherein every claim is alone as the independent preferred embodiment of the present invention.
Description above comprises giving an example of one or more embodiment.Certainly, all possible combination of describing parts or method in order to describe above-described embodiment is impossible, but those of ordinary skills should be realized that, each embodiment can do further combinations and permutations.Therefore, the embodiment that describes herein is intended to contain all the such changes, modifications and variations in the protection range that falls into appended claims.In addition, " comprise " with regard to the term that uses in specification or claims, the mode that contains of this word is similar to term and " comprises ", just as " comprising, " in the claims as link word explain like that.In addition, using any one term " perhaps " in the specification of claims is to represent " non-exclusionism or ".

Claims (18)

1. a uplink open-loop power control method is characterized in that, the method comprises:
Calculate the desired value of site STA transmitting power;
Adjust the transmitting power of described STA according to described desired value;
Wherein, described calculating is carried out based on following formula:
P STA=min{P STA_MAX, PL OL+ C/N+10log 10(BW)+offset CAP+ offset STA; P wherein STA_MAXBe the maximum transmission power of described STA, PL OLBe the uplink transmission path loss, C/N be modulation coding mode corresponding, with respect to the minimum received power of receiving terminal Noise and Interference, BW is that Deictic Center access point CAP is the transmission bandwidth of uplink distribution and the parameter of the relation between the basic effective bandwidth, offset CAPBe the deviation adjusting of described CAP, offset STADeviation adjusting for described STA.
2. the method for claim 1 is characterized in that, by resolving the message of described CAP broadcasting, obtains the deviation adjusting of described CAP.
3. the method for claim 1 is characterized in that, when described STA does not receive the correct feedback that receives of described CAP after a uplink, increases the value of the deviation adjusting of STA, is used for calculating the desired value of described STA transmitting power next time;
When described STA receives the correct feedback that receives of described CAP after setting time uplink continuously, reduce the value of the deviation adjusting of STA, be used for calculating the desired value of described STA transmitting power next time.
4. a uplink open-loop power control method is characterized in that, the method comprises:
Calculate the desired value of site STA transmitting power;
Adjust the transmitting power of described STA according to described desired value;
Wherein, described calculating is carried out based on following formula:
P STA=min{P STA_MAX, PL OL+ C/N+10log 10(BW) }; P wherein STA_MAXBe the maximum transmission power of described STA, PL OLBe the uplink transmission path loss, C/N be modulation coding mode corresponding, with respect to the minimum received power of receiving terminal Noise and Interference, BW is the transmission bandwidth that distributes of uplink and the basic parameter of the relation between the effective bandwidth for indication CAP.
5. such as claim 1 or 4 described methods, it is characterized in that, estimate described uplink transmission path loss according to the transmitting power of described STA received signal power and described CAP.
6. method as claimed in claim 5 is characterized in that, by resolving the message of described CAP broadcasting, obtains the transmitting power of described CAP.
7. such as claim 1 or 4 described methods, it is characterized in that, by resolving the control channel CCH of the physical frame that described CAP sends, obtaining described CAP is the transmission bandwidth that uplink distributes, then calculating described CAP and be the multiple that transmission bandwidth that uplink distributes is compared with basic effective bandwidth, is the transmission bandwidth that distributes of uplink and the basic parameter of the relation between the effective bandwidth as described indication CAP.
8. such as claim 1 or 4 described methods, it is characterized in that, by resolving the CCH of the physical frame that described CAP sends, obtaining described CAP and be the multiple that transmission bandwidth that uplink distributes is compared with basic effective bandwidth, is the transmission bandwidth that distributes of uplink and the basic parameter of the relation between the effective bandwidth as described indication CAP.
9. such as claim 1 or 4 described methods, it is characterized in that, by resolving the CCH of the physical frame that described CAP sends, determine modulation coding mode, then by searching default modulation coding mode and the mapping table of minimum received power, determine the minimum received power that current modulation coding mode is corresponding.
10. a uplink open-looped power control device is characterized in that, this device comprises:
First module is for the desired value of calculating the site STA transmitting power;
Second unit is for the transmitting power of adjusting described STA according to described desired value;
Wherein, the calculating of described first module is carried out based on following formula:
P STA=min{P STA_MAX, PL OL+ C/N+10log 10(BW)+offset CAP+ offset STA; P wherein STA_MAXBe the maximum transmission power of described STA, PL OLBe the uplink transmission path loss, C/N be modulation coding mode corresponding, with respect to the minimum received power of receiving terminal Noise and Interference, BW is the transmission bandwidth that distributes of uplink and the basic parameter of the relation between the effective bandwidth for indication CAP, offset CAPBe the deviation adjusting of described CAP, offset STADeviation adjusting for described STA.
11. device as claimed in claim 10 is characterized in that, this device also comprises: Unit the 3rd is used for obtaining the deviation adjusting of described CAP by resolving the message of described CAP broadcasting.
12. device as claimed in claim 10, it is characterized in that, this device also comprises: Unit the 4th, be used for when STA does not receive the correct feedback that receives of CAP after a uplink, increase the deviation adjusting of STA, be used for calculating the desired value of STA transmitting power next time, when STA receives the correct feedback that receives of CAP after setting time uplink continuously, reduce the value of the deviation adjusting of STA, be used for calculating the desired value of STA transmitting power next time.
13. a uplink open-looped power control device is characterized in that, this device comprises:
First module is for the desired value of calculating the site STA transmitting power;
Second unit is for the transmitting power of adjusting described STA according to described desired value;
Wherein, the calculating of described first module is carried out based on following formula:
P STA=min{P STA_MAX, PL OL+ C/N+10log 10(BW) }; P wherein STA_MAXBe the maximum transmission power of described STA, PL OLBe the uplink transmission path loss, C/N be modulation coding mode corresponding, with respect to the minimum received power of receiving terminal Noise and Interference, BW is the transmission bandwidth that distributes of uplink and the basic parameter of the relation between the effective bandwidth for indication CAP.
14. such as claim 10 or 13 described devices, it is characterized in that, this device also comprises: computing unit is used for the transmitting power estimation uplink transmission path loss according to described STA received signal power and described CAP.
15. device as claimed in claim 14 is characterized in that, described computing unit parses the transmitting power of described CAP from the message of CAP broadcasting.
16. such as claim 10 or 13 described devices, it is characterized in that, this device also comprises: the first determining unit, be used for the CCH by the physical frame of resolving described CAP transmission, determine that described CAP is the transmission bandwidth that uplink distributes, calculating described CAP and be the multiple that transmission bandwidth that uplink distributes is compared with basic effective bandwidth, is the transmission bandwidth that distributes of uplink and the basic parameter of the relation between the effective bandwidth as described indication CAP.
17. such as claim 10 or 13 described devices, it is characterized in that, this device also comprises: the first determining unit, be used for the CCH by the physical frame of resolving described CAP transmission, obtaining described CAP and be the multiple that transmission bandwidth that uplink distributes is compared with basic effective bandwidth, is the transmission bandwidth that distributes of uplink and the basic parameter of the relation between the effective bandwidth as described indication CAP.
18. such as claim 10 or 13 described devices, it is characterized in that, this device also comprises: the second determining unit, be used for the CCH by the physical frame of resolving described CAP transmission, determine modulation coding mode, by searching default modulation coding mode and the mapping table of minimum received power, determine the minimum received power that modulation coding mode is corresponding.
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