CN103796290A - Link control method and device - Google Patents
Link control method and device Download PDFInfo
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- CN103796290A CN103796290A CN201210420652.1A CN201210420652A CN103796290A CN 103796290 A CN103796290 A CN 103796290A CN 201210420652 A CN201210420652 A CN 201210420652A CN 103796290 A CN103796290 A CN 103796290A
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Abstract
The invention provides a link control method and device and belongs to the wireless field. The method comprises the following steps that: first link quality is obtained; a new modulation mode to be used is determined according to the first link quality; current transmitting power is obtained; and if the current transmitting power can make microwave transmission equipment work normally under the new modulation mode, the new modulation mode is determined as a current modulation mode, otherwise, an original modulation mode is kept as the current modulation. With the link control method and device of the invention adopted, nonlinear distortion occurring under a high-order modulation mode, which is caused by discordance of the effects of automatic modulation (AM) and automatic transmit power control (ATPC), can be avoided, and at the same time, it can be ensured that a low-order modulation mode can exert larger transmission power.
Description
Technical field
The present invention relates to wireless communication field, particularly a kind of chainlink control method and device.
Background technology
Along with the development of the communication technology, the digital multimedia services evolution of business from the wide speech business of simple small band to large bandwidth, supports the demand of the microwave transport equipment of adaptive modulation system (Automatic Modulation, AM) also day by day to increase.
This class microwave transport equipment is (such as becoming a fine day when) in the time that weather condition is good, need to support high-order modulating (as 256QAM, quadrature amplitude modulation mode) to obtain larger bandwidth; But when weather condition is poor (as the cloudy day Sometimes When It Rains), in the untenable situation of high-order modulating, need to use low-order-modulated mode (as QPSK, Quadrature Phase Shift Keying modulation system) to maintain the normal transmission of important service;
But because radio-frequency power amplifier exists nonlinear distortion, when power is larger, distortion is just larger, when the transmitting power of radio frequency is set, need to reserve enough rollback power occurs with the situation that reduces emergent power distortion, because the peak-to-average force ratio under high-order modulating will be higher than the peak-to-average force ratio under low-order-modulated mode, this just requires in high-order modulating to need larger rollback power, and this just causes maximum transmission power under high-order modulating lower than the maximum transmission power under low-order-modulated mode.
In traditional microwave transmission equipment, in the situation that adaptive modulation system is opened, the maximum transmission power of radio frequency can only be set to the transmitting power of high-order modulating.In the situation that adaptive modulation system is switched to low order, can not bring into play to greatest extent the over-all properties of power amplifier like this, cause the waste of power amplification efficiency, reduce anti fading ability.
Microwave transport equipment is also supported automatic transmitting power control (Automatic Transmit PowerControl simultaneously, ATPC) technology, ATPC technology arranges the received power scope of expectation, when actual received power lower than expect received power scope time, emitting side increases transmitting power, when actual received power higher than expect received power scope time, emitting side reduce transmitting power.
In the situation that AM and ATPC open simultaneously, often, due to the restriction of AM, ATPC cannot bring into play larger transmitting power under low-order-modulated mode, or due to the reason of ATPC, AM has produced nonlinear distortion in being adjusted to high-order modulating, causes wireless link normally to work.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of chainlink control method and device, in the situation that AM and ATPC open simultaneously, can guarantee that low-order-modulated mode brings into play larger transmitting power, and high-order modulating does not produce the nonlinear distortion of power.
For solving the problems of the technologies described above, of the present inventionly provide a kind of chainlink control method, comprise the steps:
Obtain the first link-quality; Determine the new modulation system that will use according to described the first link-quality; Obtain current transmit power; If described current transmit power can make microwave transport equipment normally be operated under described new modulation system, determine that described new modulation system is current modulation mode; Otherwise keeping former modulation system is current modulation mode.
Wherein, determine that according to described the first link-quality the step of the new modulation system that will use comprises: be new modulation system if described the first link-quality higher than the threshold value that enters of high-order modulating, is selected high-order modulating; If described the first link-quality lower than former modulation system corresponding exit threshold value, selecting low-order-modulated mode is new modulation system.
Wherein, the method also comprises: according to the link-quality under described current modulation mode, adjust the transmitting power under current modulation mode.
Wherein, according to the link-quality under current modulation mode, the step of adjusting the transmitting power under current modulation mode can also comprise: if the second link-quality under described current modulation mode is higher than a desired value, reduce the transmitting power under current modulation mode, if described the second link-quality, lower than described desired value, improves the transmitting power under current modulation mode.
Wherein, in the adjustment of the transmitting power under described current modulation mode, be limited to: the maximum transmission power under described current modulation mode.
Wherein, if described current modulation mode is the high-order modulating higher than former modulation system, also further comprise: whether the power loss of bringing after modulation system rises rank can maintain the required channel quality of high order modulation, if met, lower the maximum transmission power of transmitting power to high-order; Otherwise refusal modulation system changes request, keeps original modulation system constant.
Wherein, whether the power loss of bringing after modulation system rises rank can maintain the required channel quality of high order modulation, if met, lowers the maximum transmission power of transmitting power to high-order; Otherwise, refusal modulation system changes request, keep the constant step of original modulation system to comprise: if required link-quality under current link-quality-(maximum transmission power under current transmit power-high-order modulating) > high-order modulating, assert that the transmitting power after described downward can guarantee channel quality, allowing to keep current high-order modulating is current modulation mode; If the required link-quality of current link-quality-(maximum transmission power under current transmit power-high-order modulating) < high-order, assert that the transmitting power after described downward can not guarantee channel quality, refusal modulation system changes request, keeps original modulation system constant.
Wherein, described high-order modulating is quadrature amplitude modulation mode, and described low-order-modulated mode is Quadrature Phase Shift Keying modulation system.
According to a further aspect in the invention, also provide a kind of link data unit, comprising:
The first acquiring unit, for obtaining the first link-quality; Modulation system selected cell, for determining the new modulation system that will use according to described the first link-quality; Second acquisition unit, for obtaining current transmit power; Modulation system identifying unit, if can make microwave transport equipment normally be operated under described new modulation system for described current transmit power, determines that described new modulation system is current modulation mode; Otherwise keeping former modulation system is current modulation mode.
Wherein, described modulation system selected cell specifically for: be new modulation system if described the first link-quality higher than the threshold value that enters of high-order modulating, is selected high-order modulating; If described the first link-quality lower than former modulation system corresponding exit threshold value, selecting low-order-modulated mode is new modulation system.
Wherein, this device also comprises: transmission power adjustment unit, for according to the link-quality under described current modulation mode, adjust the transmitting power under current modulation mode.
Wherein, described transmission power adjustment unit specifically for: if the second link-quality under described current modulation mode is higher than a desired value, reduce the transmitting power under current modulation mode, if described the second link-quality, lower than described desired value, improves the transmitting power under current modulation mode.
Wherein, in the adjustment of the transmitting power under described current modulation mode, be limited to: the maximum transmission power under described current modulation mode.
Wherein, transmission power adjustment unit is also further used for: whether the power loss of bringing after modulation system rises rank can maintain the required channel quality of high order modulation, if met, lowers the maximum transmission power of transmitting power to high-order; Otherwise refusal modulation system changes request, keeps original modulation system constant.
Wherein, described transmission power adjustment unit specifically for: if required link-quality under current link-quality-(maximum transmission power under current transmit power-high-order modulating) > high-order modulating, assert that the transmitting power after described downward can guarantee channel quality, allowing to keep current high-order modulating is current modulation mode; If the required link-quality of current link-quality-(maximum transmission power under current transmit power-high-order modulating) < high-order, assert that the transmitting power after described downward can not guarantee channel quality, refusal modulation system changes request, keeps original modulation system constant.
The present invention has avoided, because the effect of AM and ATPC is inharmonious, under high-order modulating, nonlinear distortion occurring; Guaranteed that low-order-modulated mode brings into play larger transmitting power simultaneously.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of method in the present invention;
The detail flowchart of the method that Fig. 2-Fig. 4 provides for the embodiment of the present invention 1;
The structural representation of the device that Fig. 5 provides for the embodiment of the present invention 2;
Embodiment
For making the technical problem to be solved in the present invention, technical scheme and advantage clearer, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
Embodiment 1
As shown in Figure 1, a kind of chainlink control method, comprises the steps:
Step 1, obtains the first link-quality;
Step 2, determines the new modulation system that will use according to described the first link-quality;
Step 3, obtains current transmit power;
Step 4, if described current transmit power can make microwave transport equipment normally be operated under described new modulation system, determines that described new modulation system is current modulation mode; Otherwise keeping former modulation system is current modulation mode.
Wherein, step 2 comprises: be new modulation system if described the first link-quality higher than the threshold value that enters of high-order modulating, is selected high-order modulating; If described the first link-quality lower than former modulation system corresponding exit threshold value, selecting low-order-modulated mode is new modulation system.
In another embodiment of the present invention, comprise that on the basis of above-mentioned steps 1-4, the method also comprises:
Step 5, according to the link-quality under described current modulation mode, adjusts the transmitting power under current modulation mode.
Wherein, according to the link-quality under current modulation mode, the step of adjusting the transmitting power under current modulation mode can also comprise: if the second link-quality under described current modulation mode is higher than a desired value, reduce the transmitting power under current modulation mode, guarantee that high-order is adjusted to mode and leaves enough power assurance rollbacks.If described the second link-quality, lower than described desired value, improves the transmitting power under current modulation mode, while guaranteeing low-order-modulated, can maximum power transmit.
Wherein, in the adjustment of the transmitting power under described current modulation mode, be limited to: the maximum transmission power under described current modulation mode.This maximum power is the maximum transmission power that microwave transmission can normally be worked.
Wherein, if described current modulation mode is the high-order modulating higher than former modulation system, also further comprise: whether the power loss of bringing after modulation system rises rank can maintain the required channel quality of high order modulation, if met, lower the maximum transmission power of transmitting power to high-order; Otherwise refusal modulation system changes request, keeps original modulation system constant.
Wherein, whether the power loss of bringing after modulation system rises rank can maintain the required channel quality of high order modulation, if met, lowers the maximum transmission power of transmitting power to high-order; Otherwise, refusal modulation system changes request, keep the constant step of original modulation system to comprise: if required link-quality under current link-quality-(maximum transmission power under current transmit power-high-order modulating) > high-order modulating, assert that the transmitting power after described downward can guarantee channel quality, allowing to keep current high-order modulating is current modulation mode; If the required link-quality of current link-quality-(maximum transmission power under current transmit power-high-order modulating) < high-order, assert that the transmitting power after described downward can not guarantee channel quality, refusal modulation system changes request, keeps original modulation system constant.
Wherein, described high-order modulating is quadrature amplitude modulation mode, and described low-order-modulated mode is Quadrature Phase Shift Keying modulation system.
As shown in Figure 2, below top method is specifically described:
S101: obtain current the first link-quality;
S102: according to the first link-quality selecting modulation mode, if link-quality is good, select high-order modulating (as 256QAM), if link-quality is poor, select low-order-modulated mode (as QPSK);
Specifically be, new modulation system if described the first link-quality higher than the threshold value that enters of high-order modulating, is selected high-order modulating; If described the first link-quality lower than former modulation system corresponding exit threshold value, selecting low-order-modulated mode is new modulation system; For each rank modulation system, there is one to enter thresholding and exit thresholding, when channel quality be greater than higher order enter thresholding time, illustrate that current link modulation may operate in high-order modulating, carry out rising rank operation requests, if link-quality lower than exiting thresholding when, illustrates that link-quality can not maintain current rank, carry out depression of order operation requests;
S103: power judgement is carried out in the request of changing according to modulation system, according to power decision algorithm to determine whether current transmit power can normally be operated under new modulation system, if can carry out step S105, otherwise, carry out step S104, will introduce in detail power decision algorithm below herein;
S104: after power is adjudicated unsuccessfully, new modulation system does not come into force, and maintains original modulation system constant;
S105: after power is adjudicated successfully, new modulation system is set;
S106: according to link-quality and current modulation mode, determine transmitting power, if link condition improves, reduce transmitting power, if link-quality variation, improve transmitting power, in transmitting power, be limited to the maximum transmission power under current modulation mode, can give full play to power amplification efficiency and guarantee undistorted guaranteeing;
Specifically, if the second link-quality under described current modulation mode is higher than a desired value, reduce the transmitting power under current modulation mode, guarantee that high-order is adjusted to mode and leaves enough power assurance rollbacks.If described the second link-quality, lower than described desired value, improves the transmitting power under current modulation mode, while guaranteeing low-order-modulated, can maximum power transmit.
Whether the power loss of bringing after modulation system rises rank can maintain the required channel quality of high order modulation, if met, lowers the maximum transmission power of transmitting power to high-order; Otherwise refusal modulation system changes request, keeps original modulation system constant;
Wherein, the link-quality of expectation can be user configured, also can determine according to the thresholding that enters of higher order, enters thresholding definite time when what use higher order, and the function of ATPC will regulate transmitting power to rise the condition on rank to reach AM as much as possible.
The determination methods that modulation system is changed to request below in conjunction with two kinds of forms of expression further describes:
< form of expression 1>
As shown in Figure 3:
S201: receive modulation system and change request message;
S202: judge whether be modulation system rise rank operations, if execution step S203, otherwise execution step S204;
S203: judge that whether current transmit power is lower than the maximum transmission power under modulation system in the request of changing, if execution step S204, if not execution step S205;
Concrete, if current transmitting power has exceeded the maximum transmit power of high-order, rising the nonlinear distortion that must cause power behind rank, cause link-quality variation, if the maximum transmission power on the paramount rank of lower adjusting power, also may cause reaching the required requirement of high-order because power declines by link-quality, thereby produce error code;
S204: agree to that modulation system changes request, the modulation system that comes into force changes;
S205: refusal modulation system changes request, keeps original modulation system;
< form of expression 2>
When link-quality good, during higher than default minimum threshold, if selection high-order modulating, need larger rollback power to guarantee in transmitting procedure undistorted, so, it is excessive that possible current power takies gross power, remaining rollback underpower is to guarantee transmission quality, in order to address the above problem, the present invention also provides another one scheme, and this scheme can, at link-quality during higher than minimum threshold, be reduced to current power the maximum power of high-order modulating, realize and having guaranteed under transmission quality prerequisite, as far as possible with high power transmission.Idiographic flow is as shown in Figure 4:
S301: receive modulation system and change request message;
S302: judge whether be modulation system rise rank operations, if execution step S303, otherwise execution step S304;
S303: judge that whether current transmit power is lower than the maximum transmission power under modulation system in the request of changing, if execution step S304, if not execution step S305;
S304: agree to that modulation system changes request, the modulation system that comes into force changes;
S305: judgement rises the power loss of bringing behind rank and whether still can maintain the required channel quality of high order modulation, if met, performs step S306, does not meet and performs step S307;
Concrete, can be just like the formula that acts:
If required link-quality under current link-quality-(maximum transmission power under current transmit power-high-order modulating) > high-order modulating, assert that the transmitting power after described downward can guarantee channel quality, allowing to keep current high-order modulating is current modulation mode; If the required link-quality of current link-quality-(maximum transmission power under current transmit power-high-order modulating) < high-order, assert that the transmitting power after described downward can not guarantee channel quality, refusal modulation system changes request, keeps original modulation system constant; This algorithm is by converting the power loss rising behind rank, if the reduction of power brings the decline of signal to noise ratio still can meet the demand of high-order to channel quality, allow to rise rank, being a little of this algorithm makes AM can reach to greatest extent high order modulation, the capacity of increase system;
S306: lower the maximum transmission power of transmitting power to high-order;
S307: refusal modulation system changes request, keeps original modulation system;
Method of the present invention judges the operable modulation system of link by obtaining at any time link quality information, judge afterwards whether current transmit power can be under new modulation system, assurance microwave transport equipment is normally worked, thereby solve in the situation that AM and ATPC open simultaneously, due to the restriction of AM, ATPC cannot bring into play larger transmitting power under low-order-modulated mode, or due to the reason of ATPC, AM has produced nonlinear distortion in being adjusted to high-order modulating, the problem such as cause that wireless link cannot normally be worked.In addition according to the link-quality under described current modulation mode, adjust the transmitting power under current modulation mode, guarantee that low-order-modulated mode brings into play larger transmitting power.
Embodiment 2
Correspondingly, the invention provides a kind of link data unit, as shown in Figure 5, comprising:
The first acquiring unit, for obtaining the first link-quality;
Modulation system selected cell, for determining the new modulation system that will use according to described the first link-quality;
Second acquisition unit, for obtaining current transmit power;
Modulation system identifying unit, if for judging that described current transmit power can make microwave transport equipment normally be operated under described new modulation system, determines that described new modulation system is current modulation mode; Otherwise keeping former modulation system is current modulation mode.
Wherein, described modulation system selected cell specifically for: be new modulation system if described the first link-quality higher than the threshold value that enters of high-order modulating, is selected high-order modulating; If described the first link-quality lower than former modulation system corresponding exit threshold value, selecting low-order-modulated mode is new modulation system.
In addition, this device can also comprise: transmission power adjustment unit, can, according to the link-quality under described current modulation mode, adjust the transmitting power under current modulation mode.If the second link-quality under described current modulation mode, higher than a desired value, reduces the transmitting power under current modulation mode, if described the second link-quality is lower than described desired value, improve the transmitting power under current modulation mode.Wherein, in the adjustment of the transmitting power under described current modulation mode, be limited to: the maximum transmission power under described current modulation mode.
Transmission power adjustment unit is also further used for: whether the power loss of bringing after modulation system rises rank can maintain the required channel quality of high order modulation, if met, lowers the maximum transmission power of transmitting power to high-order; Otherwise refusal modulation system changes request, keeps original modulation system constant.
Judge whether that the method that can maintain the required channel quality of high order modulation is: if required link-quality under current link-quality-(maximum transmission power under current transmit power-high-order modulating) > high-order modulating, assert that the transmitting power after described downward can guarantee channel quality, allowing to keep current high-order modulating is current modulation mode; If the required link-quality of current link-quality-(maximum transmission power under current transmit power-high-order modulating) < high-order, assert that the transmitting power after described downward can not guarantee channel quality, refusal modulation system changes request, keeps original modulation system constant.
The device of this programme has solved in the situation that AM and ATPC open simultaneously, due to the restriction of AM, ATPC cannot bring into play larger transmitting power under low-order-modulated mode, or due to the reason of ATPC, AM has produced nonlinear distortion in being adjusted to high-order modulating, the problem such as cause that wireless link cannot normally be worked.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (15)
1. a chainlink control method, is characterized in that, comprises the steps:
Obtain the first link-quality;
Determine the new modulation system that will use according to described the first link-quality;
Obtain current transmit power;
If described current transmit power can make microwave transport equipment normally be operated under described new modulation system, determine that described new modulation system is current modulation mode; Otherwise keeping former modulation system is current modulation mode.
2. chainlink control method according to claim 1, is characterized in that, determines that the step of the new modulation system that will use comprises according to described the first link-quality:
If it is new modulation system that described the first link-quality higher than the threshold value that enters of high-order modulating, is selected high-order modulating;
If described the first link-quality lower than former modulation system corresponding exit threshold value, selecting low-order-modulated mode is new modulation system.
3. chainlink control method according to claim 1, is characterized in that, also comprises:
According to the link-quality under described current modulation mode, adjust the transmitting power under current modulation mode.
4. chainlink control method according to claim 3, is characterized in that, according to the link-quality under current modulation mode, the step of adjusting the transmitting power under current modulation mode comprises:
If the second link-quality under described current modulation mode, higher than a desired value, reduces the transmitting power under current modulation mode, if described the second link-quality is lower than described desired value, improve the transmitting power under current modulation mode.
5. chainlink control method according to claim 4, is characterized in that, in the adjustment of the transmitting power under described current modulation mode, is limited to: the maximum transmission power under described current modulation mode.
6. chainlink control method according to claim 3, is characterized in that, if described current modulation mode is the high-order modulating higher than former modulation system, also further comprises:
Whether the power loss of bringing after modulation system rises rank can maintain the required channel quality of high order modulation, if met, lowers the maximum transmission power of transmitting power to high-order; Otherwise refusal modulation system changes request, keeps original modulation system constant.
7. chainlink control method according to claim 6, is characterized in that, whether the power loss of bringing after modulation system rises rank can maintain the required channel quality of high order modulation, if met, lowers the maximum transmission power of transmitting power to high-order; Otherwise refusal modulation system changes request, keeps the constant step of original modulation system to comprise:
If required link-quality under current link-quality-(maximum transmission power under current transmit power-high-order modulating) > high-order modulating, assert that the transmitting power after described downward can guarantee channel quality, allowing to keep current high-order modulating is current modulation mode;
If the required link-quality of current link-quality-(maximum transmission power under current transmit power-high-order modulating) < high-order, assert that the transmitting power after described downward can not guarantee channel quality, refusal modulation system changes request, keeps original modulation system constant.
8. chainlink control method according to claim 1, is characterized in that, described high-order modulating is quadrature amplitude modulation mode, and described low-order-modulated mode is Quadrature Phase Shift Keying modulation system.
9. a link data unit, is characterized in that, comprising:
The first acquiring unit, for obtaining the first link-quality;
Modulation system selected cell, for determining the new modulation system that will use according to described the first link-quality;
Second acquisition unit, for obtaining current transmit power;
Modulation system identifying unit, if can make microwave transport equipment normally be operated under described new modulation system for described current transmit power, determines that described new modulation system is current modulation mode; Otherwise keeping former modulation system is current modulation mode.
10. link data unit according to claim 9, is characterized in that, described modulation system selected cell specifically for:
If it is new modulation system that described the first link-quality higher than the threshold value that enters of high-order modulating, is selected high-order modulating;
If described the first link-quality lower than former modulation system corresponding exit threshold value, selecting low-order-modulated mode is new modulation system.
11. link data units according to claim 9, is characterized in that, also comprise:
Transmission power adjustment unit, for according to the link-quality under described current modulation mode, adjusts the transmitting power under current modulation mode.
12. link data units according to claim 11, is characterized in that, described transmission power adjustment unit specifically for:
If the second link-quality under described current modulation mode, higher than a desired value, reduces the transmitting power under current modulation mode, if described the second link-quality is lower than described desired value, improve the transmitting power under current modulation mode.
13. link data units according to claim 12, is characterized in that, in the adjustment of the transmitting power under described current modulation mode, are limited to: the maximum transmission power under described current modulation mode.
14. link data units according to claim 11, is characterized in that, transmission power adjustment unit is also further used for:
Whether the power loss of bringing after modulation system rises rank can maintain the required channel quality of high order modulation, if met, lowers the maximum transmission power of transmitting power to high-order; Otherwise refusal modulation system changes request, keeps original modulation system constant.
15. link data units according to claim 14, is characterized in that, described transmission power adjustment unit specifically for:
If required link-quality under current link-quality-(maximum transmission power under current transmit power-high-order modulating) > high-order modulating, assert that the transmitting power after described downward can guarantee channel quality, allowing to keep current high-order modulating is current modulation mode;
If the required link-quality of current link-quality-(maximum transmission power under current transmit power-high-order modulating) < high-order, assert that the transmitting power after described downward can not guarantee channel quality, refusal modulation system changes request, keeps original modulation system constant.
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| US20120134337A1 (en) * | 2007-07-06 | 2012-05-31 | Tatsushi Aiba | Mobile communication system, base station apparatus, and mobile station apparatus |
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| CN102036291A (en) * | 2009-09-28 | 2011-04-27 | 中兴通讯股份有限公司 | Method and device for processing channel quality report of backhaul link |
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